Dissertationen: „Manufacture and works“

1

Meehan, Samantha. „The fate of cyanide in groundwater at gasworks sites in South-Eastern Australia /“. Connect to thesis, 2000. http://eprints.unimelb.edu.au/archive/00000229.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

2

Hepola, Jouko. „Sulfur transformations in catalytic hot-gas cleaning of gasification gas /“. Espoo [Finland] : Technical Research Centre of Finland, 2000. http://www.vtt.fi/inf/pdf/publications/2000/P425.pdf.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

3

Tang, Wing-keung. „Redevelopment of potentially hazardous installations : a case study of the Hong Kong and China gas works at Ma Tau Kok /“. [Hong Kong] : University of Hong Kong, 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13814199.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

4

Farkas, Zita. „The reception of Jeanette Winterson's work: The manufacture of a Contemporary British Writer“. Thesis, University of York, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489192.

Der volle Inhalt der Quelle

Annotation:

This thesis examines the ways in which four different reception areas shape the reception of Jeanette Winterson's work. These reception areas are the academic, the writer's own view on her work and its reception, the mass media and university syllabi. The analyses of these areas explore how the reception of Winterson's work is influenced by readers' negotiation with interpretations of her work within and among these kinds of reception.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

5

Griffiths, Sarah Jane. „The charitable work of the Macclesfield silk manufacturers, 1750-1900“. Thesis, University of Liverpool, 2006. http://hdl.handle.net/10034/81282.

Der volle Inhalt der Quelle

Annotation:

The existing literature on philanthropic effort during the eighteenth and nineteenth centuries has taken a number of different approaches to the subject. These include general works charting the development of the charitable sector, the exploration of voluntary organisations as a subsidiary topic to broader themes and regional studies adopting a range of perspectives. Most research in this latter category has been conducted on large towns and cities that generally have copious amounts of source material. In contrast, lesser provincial towns have received relatively little scholarly attention, despite the more manageable nature of their documentation. The aim of this thesis is to explore the growth of charitable organisations within Macclesfield, an East Cheshire industrial town that was dominated by the silk industry. This study concentrates on the period from 1750 to 1900, when the silk industry was dominant within the town and philanthropic activity was at its height. The town?s silk manufacturers were renowned for their charitable work and thus this research focuses on the extent to which this occupational group was critical in the development of Macclesfield?s voluntary institutions, the motives that lay behind their contributions, and their achievements. In order to see whether their involvement was typical of other businessmen, comparisons are drawn throughout with the charitable activities of contemporary entrepreneurs in a variety of urban settings.This study investigates the silk manufacturers? participation in Macclesfield?s voluntary institutions in the fields of religion, education, public services and public amenities, together with any additional charitable acts. The evidence from all these areas suggests that in most cases the silk manufacturers were heavily involved in funding and managing these institutions. Their obvious motives reflected altruistic, religious and educational beliefs, but there were also a variety of other concerns that could have been contributory in determining their support for particular institutions. The primary achievement of Macclesfield?s voluntary sector was to provide a network of services that, in conjunction with later state initiatives, improved living standards for inhabitants by the end of the nineteenth century.This thesis gives an insight into the development of charitable institutions in a medium sized industrial town and demonstrates how one group of businessmen were able to dominate this field. Many silk manufacturers were generous in their support of charitable causes in Macclesfield, but the scale of their support did not match that of some other notable philanthropic families, such as the Crossleys of Halifax. The charitable work of the silk manufacturers appeared to be broadly similar to that of entrepreneurs in other small and medium sized industrial towns where they could form a dominant occupational group in public life. In larger towns and cities, this strong manufacturer influence was less evident and a greater range of other people contributed significantly to philanthropic institutions. This type of approach supplements the existing material on philanthropic effort during the long nineteenth century and overlaps a number of related subject areas, such as urban ?lite activity and the growth of the welfare state.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

6

Andersson, Henrik. „Thermal fatigue and soldering experiments of additively manufactured hot work tool steels“. Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-68677.

Der volle Inhalt der Quelle

Annotation:

Modern manufacturing processes are under a never ending evolvement. Lowered manufacturing costs, higher part quality, shorter lead times and lower environmental impact are some important drivers for this development. Aluminum die casting is an effective and attractive process when producing components for e.g. the automotive sector. Die casting process development, and hot work tool steel development for the die casting dies has led to the state of the art of die casting today. However, with the disruptive emergence of Additive Manufacturing (AM) of hot work steel alloys, new interesting features such as improved conformal cooling channels inside die casting molds can be produced. The new way to manufacture die casting dies, need basic investigating of the AM produced hot work tool steel properties, and their applicability in this demanding hot work segment. Die casting dies face several detrimental wear mechanisms during use in production, three of which has been isolated and used for testing three AM produced steel alloys and one conventional premium hot work tool steel. The wear mechanisms simulated are; thermal fatigue, static soldering and agitated soldering. The aim is to study the AM produced steels applicability in the die casting process. The tested materials are; Premium AISI H13 grade Uddeholm Orvar Supreme, AM 1.2709, AM UAB1 and AM H13. Based on current investigations the conclusion that can be made is that with right chemistry, and right AM processing, conventional material Uddeholm Orvar Supreme still is better than AM H13. This also complies with the literature study results, showing that conventional material still is better than AM material in general.
Våra moderna tillverkningsprocesser är under ständig utveckling. Drivande motiv är minskade tillverkningskostnader, högre tillverkningskvalitet, kortade ledtider samt minskad miljöpåfrestning. Pressgjutning av aluminium är en effektiv och attraktiv tillverkningsprocess ofta använd inom till exempel fordonsindustrin. Utvecklingen av pressgjutningsteknologin har gått hand i hand med utvecklingen av det varmarbets-verktygsstål som används i gjutformarna (pressgjutningsverktyget). Den utvecklingen har lett till dagens processnivå och branschstandard. Men med den revolutionerande additiva tillverkningsteknologins (AM) intåg, och möjlighet att producera komponenter av varmarbetsstål, kommer nya intressanta möjligheter att integrera komplex geometri så som yt-parallella kylkanaler i verktyget utan att tillverkningskostnaden blir för hög etc. Det nya sättet att producera pressgjutningsverktyg ger upphov till behovet av grundläggande materialundersökningar av sådant AM-material, samt hur tillförlitligt det är i pressgjutningsverktyg med pressgjutningens krävande materialegenskapsprofil. Pressgjutningsverktyg utsätts för många förslitningsmekanismer och för höga laster, tre av dessa mekanismer har isolerats för kontrollerade tester av ett konventionellt material och tre AM materials responser. Förslitningsmekanismerna som efterliknats är; termisk utmattning, statisk soldering och agiterad soldering. Målet med undersökningarna är att studera AM producerade materials lämplighet i pressgjutningsprocessen. De material som testats är konventionella premium varmarbetsstålet Uddeholm Orvar Supreme av typ AISI H13, AM 1.2709, AM UAB1 och AM H13. Undersökningarnas slutsats är att med rätt kemisk sammansättning, och med rätt AM printing parametrar, är konventionellt material fortfarande mer applicerbart i pressgjutning än AM producerat. Den slutsatsen faller väl I samklang med resultaten från mekanisk provning som återspeglas i litteraturstudien, som visade visar att konventionellt material är generellt bättre än AM material.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

7

Trång, Christina. „Improving work conditions formanufacturing workers : A study at a module house manufacturer“. Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65919.

Der volle Inhalt der Quelle

Annotation:

This thesis is the final component of the Master of Science degree within Industrial design engineering at Luleå University of Technology. The purpose of the project was to analyze an issue and developing a conceptual solution based on scientific knowledge within the field. The project was carried out at SmålandsVillan's production facility in Sundsvall which produces module bungalows and condominiums. The objective of the project was to define and analyze why the company struggled with sick leaves among the operators and the aim was to develop a solution to ease the strained work situation. When the project was initiated in January, the given issues were that two workstations, floor and middle joist system, had high sick leave due to physically demanding work and that they had been struggling with backlogs in the previous fall. The mapping of the current state started with a wide scanning of empirical data of sick leaves but also incidents and accidents for all teams at the facility. The data showed that the two workstations had higher sick leave than most of the other teams, thus the project carried out a more thorough mapping on these workstations. The focused mapping was carried out in two steps: First by observing ergonomic postures and analyzing with a modified version of the Ovako Working Posture Analyzing System (OWAS), and secondly by interviewing the operators to map their mental work situation. When the mappings were put together and analyzed, it was clear that the cause of the issues at floor joist system was a conflict between the operators and managers rather than physically demanding work. The facility had expanded its production in the fall and in that process, floor joist system lost stock areas, fell behind in the production pace, and got in a conflict with the managers. Because of the layout issues, the project focus was widened to map the current layout as well. At middle joist system, the found issues were static kneeling postures and carrying heavy loads. The ideation phase of the project was carried out in two parallel paths: One to develop a new layout at floor joist system, and the other to develop ergonomic equipment for middle joist system. The operators were highly involved in the process to define what issues to solve and find suitable solutions. A total of five concepts were obtained, two ergonomic solutions and three layouts. By a joint specification of requirements, one of the layout concepts was chosen for further development. The final development of the concept contained detailed solutions at several areas related to the workstation. In the current layout, the operators were forced to walk in the forklift aisles to get materials. This issue was not eliminated but reduced in the final concept development: By placing heavy materials closer to the worktables, the operators did not have to carry loads as far, thus the risk of musculoskeletal disorders was decreased. The accident risk when operators walk in the forklift aisles was also reduced because both distances and number of walks were decreased. In addition to the layout, ergonomic equipment of a pushcart and height adjustable table were also evaluated to further ease the strain on the bodies when handling heavy loads. Due to lack of time, it was not possible to calculate the optimal stock sizes. Therefore, the recommendation to SmålandsVillan is to first calculate material needs and thereafter implement the detailed areas one by one, and finally implement ergonomic equipment.
Denna rapport är det sista momentet i utbildningen Civilingenjör inom Teknisk Design med inriktning mot produktionsdesign vid Luleå Tekniska Universitet. Avsikten med projektet var att analysera ett problem och ta fram en konceptuell lösning baserat på vetenskap inom ämnet. Projektet genomfördes vid SmålandsVillans produktionsenhet i Sundsvall, vilka producerar modulhus och bostadsrätter. Syftet med projektet var att hitta och analysera orsakerna till varför företaget hade problem med sjukfrånvaro bland operatörerna och målet med projektet var att ta fram en lösning för att underlätta arbetssituationen. När projektet startade i januari var given fakta att vid två arbetsstationer, golv- och mellanbjälk, var sjukfrånvaro vanligt förekommande, arbetet var fysiskt krävande och under hösten hade det varit problem med släpande produktion. Kartläggningen av den nuvarande situationen började med en bred scanning där empiriska data över sjukfrånvaro, tillbud och olyckor jämfördes mellan alla arbetslag på fabriken. Sammanställningen visade att det var högre sjukfrånvaro vid de två arbetsstationerna än vid de flesta andra stationerna och därför fokuserades den detaljerade nulägesanalysen på dessa två. Den djupgående nulägesanalysen genomfördes i två steg: Först observerades belastningsergonomi genom en modifierad version av Ovako Working Posture Analyzing System (OWAS) och därefter intervjuades operatörerna för att kartlägga den mentala arbetssituationen. När den fysiska och mentala kartläggningen sammanställdes visade det sig att orsaken bakom problemen vid golvbjälk snarare var en konflikt mellan arbetslaget och cheferna under hösten än det fysiska arbetet. Fabriken hade expanderat produktionen under hösten och därmed förlorade golvbälk lagerytor, kom efter i produktionstakten och hamnade i en konflikt med cheferna. På grund av layoutproblemen breddades projektets fokus för att kartlägga den nuvarande layouten. Vid mellanbjälk var problemen att många moment tvingade operatörerna att stå på knä och att bära tunga laster. Idégenereringsfasen genomfördes i två parallella spår: Den ena för att ta fram layoutkoncept för golvbjälk och den andra för ergonomiska hjälpmedel för mellanbjälk. Operatörerna var engagerade i processen för att hitta vilka problem som fanns och vilka lösningar som skulle passa. Totalt togs fem koncept fram, två ergonomiska hjälpmedel och tre layouter. Genom en gemensam kravspecifikation valdes en av layouterna för vidare utveckling. Den fortsatta utvecklingen av konceptet innefattade detaljerade lösningar för flera områden som var relevanta för arbetsstationen. I den nuvarande layouten var operatörerna tvungna att gå i truckgångarna för att hämta material. Detta problem eliminerades inte men minskades i det slutgiltiga konceptet. Genom att placera tunga material nära arbetsborden behövde inte operatörerna bära lasterna lika långt och därmed minskade riskerna för belastningsskador. Olycksrisken när operatörer går i truckgångarna minskades också eftersom både sträcka och antalet vändor de gick i gångarna minskade. Layoutförändringen kompletterades med ergonomiska hjälpmedel, i form av en magasinskärra och ett höj- och sänkbart bord för att ytterligare minska den fysiska belastningen. På grund av tidsbrist var det inte möjligt att optimera hur mycket material som behövdes vid stationen. Därför är rekommendationen till SmålandsVillan att först beräkna materialbehov och därefter implementera de detaljerade områdena ett i taget och slutligen de ergonomiska hjälpmedlen.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

8

Vernon, Guy Mark. „Work humanization : comparative historical developments in the manufacturing sectors of advanced capitalist societies, 1960-1995“. Thesis, University of Warwick, 2000. http://wrap.warwick.ac.uk/2957/.

Der volle Inhalt der Quelle

Annotation:

The thesis draws on official statistics to examine comparative historical developments in the humanization of work in manufacturing industry, engaging with vital debates on societal distinctiveness. The empirical analysis spans the manufacturing sectors of eleven of the leading industrialised nations over the period 1960-95. This substantive core of the thesis is informed by an examination of research method in the field of employment relations. Initial assessment of the availability and construct validity to aggregate statistical indicators of the humanization of work results in consideration of three phenomena; the rate of incidence of fatal injuries, average annual hours actually worked, and the relative extent of managerial hierarchy. Detailed assessment of the conceptual basis of the available statistics then follows, with the aim of obtaining historically consistent and cross-nationally comparable data on these aspects of work humanization. Although dependable data on fatalities and hours are derived, the limits of the aggregate indicator of managerial hierarchy are ultimately stressed. The comparative historical patterns in the data are then examined for evidence of cross-national convergence in experiences of work humanization. With little indication of any historic convergence apparent the analysis turns to consider the forces which may shape distinctive societal experiences. Quantitative gauges of the shape of the broad political economy are assembled, with a particular attention focused on the quantitative characterisation of the power resources of employees, whether collective or individual. The meaning of these necessarily crude indicators is given extensive consideration. The thesis culminates in separate panel econometric investigations of the political economic characteristics associated with comparative fatal injury incidence and actual annual hours of work. Substantial evidence is presented that the humanization of work is associated with an attenuation of the vulnerability of employees to managerial prerogative.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

9

Saedon, Juri Bin. „Micromilling of hardened (62 HRC) AISI D2 cold work tool steel“. Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3390/.

Der volle Inhalt der Quelle

Annotation:

Investigations into micro-slot milling of high carbon, high chromium hardened AISI D2 cold work tool steel using 0.5mm diameter coated (TiAlN) tungsten carbide end mills were carried out. Performance was assessed in terms of tool life/tool wear, surface roughness, cutting forces, burr formation, slot geometry accuracy and workpiece surface integrity. The influence of operating parameters (cutting speed, feed rate and depth of cut) on tool life, surface roughness, burr width and cutting forces was evaluated using full factorial experiment design. Analysis of results included main effects plot and calculation of percentage contribution ratios (PCR) for each of the primary variable factors and their interactions were assessed via analysis of variance (ANOVA). The test array was further extended to allow for implementation of Response Surface Methodology (RSM) analysis in order to optimise tool life and surface roughness. Dual-response (cutting speed and feed rate) contours of metal removal rate and tool life/surface roughness were generated from the respective model equations. These were further developed to identify combinations of cutting speed and feed per tooth for the best tool life/surface roughness at specific metal removal rates. Finally, the impact of coatings and tool geometry on tool life and workpiece surface roughness was investigated.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

10

Rutson, Sandra M. „Rheology of chocolate. Rheological studies of chocolate in relation to their flow and mixing properties during manufacture“. Thesis, University of Bradford, 1989. http://hdl.handle.net/10454/4200.

Der volle Inhalt der Quelle

Annotation:

An investigation has been carried out into the rheology of chocolate in relation to its flow and mixing features in a real industrial environment. The chocolate manufacturing plant of Rowntree at York provided a base for this study. The project aims were: a) to measure the viscous and time dependent properties of chocolate. b) to explain the observed flow properties in relation to the constituents of chocolate. c) to determine the shear rate which, for a given recipe, yields a minimum stable viscosity (of particular commercial value). d) to assess the type of mixer able to provide this duty. The experimental work involved rheological studies with concentric cylinder and tubular viscometers, operated to measure viscosity as a function of shear rate and shearing time. The chocolate samples studied were taken from various points in the manufacture process at Rowntree, York. Model chocolate systems were made from cocoa liquor, and sugar with cocoa butter, which were studied to underpin the basic mechanisms of the flow properties of the total chocolate. Shear thinning in milk chocolate has been shown to be accounted for by surface coating and fat release from the cocoa cellular material. Analysis of the sugar and cocoa butter system gave large hysteresis loops which may be explained as due to agglomeration of the sugar particles. The level of hysteresis was found to be related to the polarity of the liquid phase, such that a more polar fluid results in less hysteresis. Laboratory experiments have revealed that the level of work input to give permanent viscosity reduction for milk chocolate is dependent on the measuring shear rate. The level of optimum shear input for the measuring range 10 to 130 sec 1 is 645 sec for 30 minutes. The apparent viscosity measured at lower shear rates requires much longer ([approx]100 minutes).
Yorkreco, Nester York Ltd.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

11

Durand, Lenard. „Psychological empowerment, job satisfaction and work engagement of employees in a surface coatings manufacturer / Lenard Durand“. Thesis, North-West University, 2008. http://hdl.handle.net/10394/1784.

Der volle Inhalt der Quelle

Annotation:

While innovation, individualisation, human rights and quality of life are acknowledged and valued by modern society, changes in the workplace such as a focus on efficiency, globalisation, restructuring, downsizing, acquisitions and merges impact, often negatively, on a workforce. A better understanding ofthese forces, as well as understanding the deeper needs of employees in organisations, should be pursued in order to optimise the workplace. South Africa is currently experiencing a skills shortage while the unemployment figures are well above 40 percent. As it is often said, the distinguishing economic resource in the twenty-first century is not commodities, but the human resource that organisations need to attract, develop and motivate in order to retain the correct type of employees. An approach is needed where both positive outcomes for the individual worker and the organisation may be achieved, including organisational performance, effective management of change, greater employee engagement and commitment, and effective talent management. Thus, the objective of this study was to identify any relationship that might exist between psychological empowerment, job satisfaction and work engagement and to determine whether psychological empowerment may predict job satisfaction and work engagement. A cross-sectional survey design was used in the study. One-hundred-and-fifty- three (N = 153) employees participated in the study in a surface coatings manufacturing organisation in Gauteng. The Psychological Empowerment Scale (MEQ), Revised Job Satisfaction Scale (JSQ), and the Utrecht Work Engagement Scale (UWES) were used. The results indicated that a statistically significant positive correlation between intrinsic motivation and work engagement (practically significant, medium effect) and meaning, correlated positively (practically significant, medium effect) with intrinsic motivation and work engagement. Extrinsic motivation correlated statistically significantly (practically significant, large effect) with work engagement. VI The regresslOn analysis indicated that 34 percent of the variance explained in work engagement is predicted by psychological empowerment (i.e. influence (impact and self-detennination), meaning, and competence) and job satisfaction (i.e. extrinsic motivation and intrinsic motivation). No statistically significant differences regarding psychological empowerment could be found between tenure and educational levels. However, statistically significant differences were found for gender and language groups. Recommendations for future research were made.
Thesis (M.A. (Industrial Psychology))--North-West University, Vaal Triangle Campus, 2008.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

12

Rutson, Sandra Mary. „Rheology of chocolate : rheological studies of chocolate in relation to their flow and mixing properties during manufacture“. Thesis, University of Bradford, 1989. http://hdl.handle.net/10454/4200.

Der volle Inhalt der Quelle

Annotation:

An investigation has been carried out into the rheology of chocolate in relation to its flow and mixing features in a real industrial environment. The chocolate manufacturing plant of Rowntree at York provided a base for this study. The project aims were: a) to measure the viscous and time dependent properties of chocolate. b) to explain the observed flow properties in relation to the constituents of chocolate. c) to determine the shear rate which, for a given recipe, yields a minimum stable viscosity (of particular commercial value). d) to assess the type of mixer able to provide this duty. The experimental work involved rheological studies with concentric cylinder and tubular viscometers, operated to measure viscosity as a function of shear rate and shearing time. The chocolate samples studied were taken from various points in the manufacture process at Rowntree, York. Model chocolate systems were made from cocoa liquor, and sugar with cocoa butter, which were studied to underpin the basic mechanisms of the flow properties of the total chocolate. Shear thinning in milk chocolate has been shown to be accounted for by surface coating and fat release from the cocoa cellular material. Analysis of the sugar and cocoa butter system gave large hysteresis loops which may be explained as due to agglomeration of the sugar particles. The level of hysteresis was found to be related to the polarity of the liquid phase, such that a more polar fluid results in less hysteresis. Laboratory experiments have revealed that the level of work input to give permanent viscosity reduction for milk chocolate is dependent on the measuring shear rate. The level of optimum shear input for the measuring range 10 to 130 sec 1 is 645 sec for 30 minutes. The apparent viscosity measured at lower shear rates requires much longer ([approx]100 minutes).

APA, Harvard, Vancouver, ISO und andere Zitierweisen

13

Dabhilkar, Mandar. „Acting creatively for enhanced performance : Challenges for Swedish manufacturers in an age of outsourcing“. Doctoral thesis, Stockholm : Department of Industrial Economics and Management, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4238.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

14

De, Bruyn Ruan. „Improving and implementing advanced milling techniques for the manufacture of selected titanium aerospace parts“. Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96139.

Der volle Inhalt der Quelle

Annotation:

Thesis (MEng)--Stellenbosch University, 2014.
ENGLISH ABSTRACT: There is a strong focus on the use of titanium and its alloys in the aerospace industry due to the high ultimate tensile strength and high strength-to-weight ratio of the material. The high performance nature of the material also makes it difficult and costly to machine. South Africa has the second most abundant titanium resources in the world in the form of rutile and ilmenite but no value chain to produce titanium parts from the ore. Currently, the ore is sold overseas at low prices. There exists an initiative to create a full titanium value chain in South Africa by the Department of Science and Technology. This project forms part of this initiative, where local industry is equipped with knowledge and skills to produce and machine titanium parts. The focus of this study is to determine whether it is possible to machine titanium aerospace parts at a local industry partner and equip the industry partner with knowledge and skills in order to facilitate effective and economical machining of these parts. Daliff Precision Engineering was selected as the local industry partner and specific demonstrator parts were selected on which to base the study. The process the industry partner currently uses to machine aerospace parts from difficult-to-machine alloys was studied and evaluated. It was found that about 70% of the machining time was spent on a single roughing process, hence the decision to study the roughing process in an attempt to establish whether improvement was possible. Pilot tests were done at the facilities of the industry partner and time savings of 95% were realised on the roughing process. A 2-level 3-factor Design of Experiments methodology was followed for experimentation and analysis of titanium machining at the industry partner. The roughing process of the demonstrator part was simulated on the CNC machining centre and the depth of cut, cutting speed and feed per tooth were selected as the factors, and the response was tool wear. A statistical analysis was done using Modde 9.1 design of experiments software and an optimisation model was created in order to determine a feasible set of cutting parameters, maximise material removal rate and have a target amount of tool wear. The findings show that it is possible to economically machine titanium aerospace parts with a selected geometry at the industry partner without the need for significant capital investments. The industry partner can use the knowledge generated in this project to validate their titanium machining capabilities and form part of the titanium value chain that is being developed in South Africa.
AFRIKAANSE OPSOMMING: Daar is ‘n groot fokus op die gebruik van titaan allooie in die lugvaart nywerheid, as gevolg van die material se hoë trek-sterkte en hoë sterkte-tot-gewig verhouding. Die eienskappe wat die material so aantreklik maak, is ook die rede wat dit moeilik en duur maak om te masjineer. Suid-Afrika het die tweede grootste titaan reserwes in die wêreld in die vorm van rutiel en ilmeniet erts, maar geen waarde ketting om titaan onderdele te vervaardig van die erts af nie. Die erts word tans oorsee verkoop teen lae pryse. Daar is tans ‘n inisiatief om ‘n titaan waardeketting in Suid-Afrika te skep deur die Departement van Wetenskap en Tegnologie. Hierdie projek vorm deel van hierdie inisiatief om die plaaslike nywerheid toe te rus met kennis en vaardighede om titaan produkte te vervaardig. The fokus van hierdie studie is om te bepaal of dit moontlik is om titaan lugvaart onderdele te masjineer by ‘n plaaslike industrie-vennoot en om hierdie vennoot met kennis en vaardighede toe te rus om hierdie onderdele effektief en ekonomies te vervaardig. Daliff Precision Engineering is gekies as die plaaslike industrie-vennoot en spesifieke demonstrator onderdele is gekies om die studie op te baseer. Die proses wat die industrie-vennoot tans gebruik om moeilik-om-te-masjineer allooie te masjineer is bestudeer en ge-evalueer. Daar was bevind dat 70% van die masjineringstyd bestee word aan ‘n enkele uitrof-proses. Daar is besluit om vas te stel of die uitrof-proses verbeter kan word. Loods-eksperimente is gedoen by die industrie-vennoot se fasiliteite en ‘n tydsbesparing van 95% is gevind op die uitrof-proses. ‘n 2-Vlak 3-faktor eksperimentele ontwerp metodologie is gevolg om eksperimente by die industrie-vennoot op titaan uit te voer en te analiseer. Die uitrof-proses van die demonstrator onderdeel is gesimuleer op die CNC masjineringsentrum en die diepte van snit, snyspoed en voer per tand is gekies as die faktore en beitel-slytasie is gekies as die respons. ‘n Statistiese analise is gedoen deur Modde 9.1 eksperimentele ontwerp sagteware te gebruik om ‘n moontlike stel van sny-parameters te identifiseer om die materiaal-verwyderingstempo te maksimeer en die teiken waarde vir beitel-slytasie te bereik. Daar is gevind dat dit moontlik is on titaan lugvaart onderdele met ‘n spesifieke geometrie ekonomies te masjineer by die industrie-vennoot, sonder om enige beduidende kapitaal uitgawes aan te gaan. Die industrie-vennoot kan die kennis gebruik wat geskep is deur die projek om hulle titaan masjineringsvaardighede te valideer en om deel te vorm van die titaan waardeketting wat besig is om in Suid-Afrika ontwikkel te word.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

15

Norouzilame, Farhad. „TOWARDS ACHIEVING NETWORK CAPABILITIES IN GLOBAL PRODUCTION NETWORK OF CONTRACT MANUFACTURERS“. Licentiate thesis, Mälardalens högskola, Innovation och produktrealisering, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-28908.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

16

Nilsson, David, und Ted Olandersson. „Designing Traceability - The Effects On Production Personnel : A Case Study of a Swedish Steel Manufacturer“. Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-44383.

Der volle Inhalt der Quelle

Annotation:

This study sets out to investigate the connection between digitally achieved traceability and the production personnel's view of traceability. The results presents a number of factors to consider when designing traceability solutions in a manufacturing setting. The study was conducted in a qualitative manner, with the main data collection done through interviews. The results show that the production worker's stand point towards traceability is based on three factors: performance measurement, surveillance, and increased workload. Each of these factors should be taken in to consideration when designing traceability solutions. These factors, and suggestions for how to work with them, is put into the context of a steel manufacturer that is in the process of implementing traceability in their production process.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

17

Smith, Jonathan Martin. „Work, worker, and injury factors associated with reporting and workers' compensation claims for low-back pain among automobile manufacturers“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0012/MQ50371.pdf.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

18

Tharayil, Pradeep Ambareeksh, und Mohammadali Baradaran. „HPDC Die design for Additive Manufacturing : Simulation and Comparison of Thermal Stresses in HPDC die designed for Additive Manufacture“. Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Industriell produktutveckling, produktion och design, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-43319.

Der volle Inhalt der Quelle

Annotation:

Additive manufacturing has a great potential to benefit die manufacture by shortening the lead time considerably and lifting the limitations on design complexity imposed by conventional manufacturing techniques. However, AM has its own requirements that together are known as Design for Additive Manufacturing and account for the process limitations. One of the significant requirements is mass efficiency of the design (it should be as light as possible). If it’s not fulfilled, AM won’t be able to make an economical solution or substitution despite having outstanding benefits. The present investigation has been framed with respect to such concern. This investigation attempts to draw a comparison between the performance of two design variants. Additionally, it has been tried to study the employed method, document implementation of the approach, and identify the challenges in accordance with design for additive manufacturing. Simulation of thermal stresses generated in die inserts for a given component during one cycle of high pressure die casting is presented. Initial design of the die inserts is subjected to redesign with the intention of mass reduction by incorporating honeycomb structure. Temperature evolution and resultant thermal stresses are analyzed for redesign and compared to those of original design. Simulation of high pressure die casting was carried out in MagmaSoft to obtain temperature history of die inserts and cast. Implicit nonlinear elastic fully coupled thermal displacement model was setup in Abaqus in which Magma results were used as input for stress calculation. Results show that according to our specific design, HPDC die with thin walled feature cannot withstand the thermal and mechanical load. However, with iterative analysis and proper topology optimization, a lightweight complex geometry die can be successfully made.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

19

Chocano, Magdalena. „Profiles of Textile Production in a Regional Space: Conchucos, Ancash, Perú, between 1593 and 1876“. Economía, 2016. http://repositorio.pucp.edu.pe/index/handle/123456789/118284.

Der volle Inhalt der Quelle

Annotation:

There is a good deal of data to suggest that the corregimiento of Conchucos was a significant textile production center. The systematization of this data has allowed us to map out the geography of the textile economy in the area, highlighting those zones where the work was carried out. On the other hand, although the lack of series for the textile production of Conchucos precludes a study of this sector that is comparable with that of Huamanga or Cusco, the available demographic information for the corregimiento allows the long-term evolution of its textile economy to be traced through to the eventual division into provinces during the Republican era. This analysis allows the ethnic and gender distribution of work in the textile sector to be discerned, while elucidating some of the elements of economic change that affected this territory.
Existe una gran cantidad de datos que sugieren que el corregimiento de Conchucos tuvo una significativa producción textil. La sistematización de esa información nos ha permitido trazar una geografía de la economía textil de ese territorio que destaca las zonas donde se desarrollaron los obrajes. Por otra parte, aunque la carencia de series para la producción textil de Conchucos no permite realizar un estudio de ese sector equiparable a los realizados para Huamanga o el Cusco, la información demográfica existente para aquella circunscripción, permite trazar un panorama de la evolución a largo plazo de su economía textil hasta su escisión en provincias ya en la época republicana. A través de ese análisis se puede percibir la distribución étnica y sexual del trabajo en el sector textil, y esclarecer algunos elementos de cambio económico que afectaron a ese territorio.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

20

Heal, Oliver Standerwick. „Tradition is the foundation of invention : a critical review of the work of Sir Ambrose Heal (1872-1959), furniture designer, manufacturer & retailer“. Thesis, Bucks New University, 2008. http://bucks.collections.crest.ac.uk/9833/.

Der volle Inhalt der Quelle

Annotation:

The purpose of this thesis is to reassess the work of Sir Ambrose Heal (1872-1959), designer, manufacturer and retailer of furniture, in order to reconsider his reputation. It offers a distinct contribution to knowledge by providing a more precise description of Ambrose Heal‟s contribution to furniture design in the early part of the twentieth century together with a more carefully considered analysis of his association with Heal & Son of Tottenham Court Road, London, than has previously been attempted. In an innovative and close reading of archival materials held at the V&A and in private hands the thesis brings new insights and authoritative detail together with a greater understanding to the following: The historic influences that were to provide an aesthetic and commercial context for the work of Ambrose Heal and the development of Heal & Son. The furniture designed by Ambrose Heal, together with a consideration of the role played by Heal & Son‟s in-house Cabinet Factory and the contribution of outside suppliers and other designers in the years between 1895 and 1939. The part played by Ambrose Heal in terms of the philosophy and direction he introduced to Heal & Son and the influential role the firm came to play under his leadership. In addition to the main text the appendices provide an accessible model for the development of a catalogue raisonné with a reliable chronology and detailed record of the sale of furniture produced by the Heal & Son Cabinet Factory between 1898 and 1939, together with other useful documents and analyses.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

21

Purwanto, Erwan Agus. „Ups and downs in rural Javanese industry the dynamics of work and life of small-scale garment manufacturers and their families /“. [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2004. http://dare.uva.nl/document/77633.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

22

Akyol, Cagdas. „Inactivation Of Peroxidase And Lipoxygenase In Green Beans, Peas And Carrots By A Combination Of High Hydrostatic Pressure And Mild Heat Treatment“. Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605655/index.pdf.

Der volle Inhalt der Quelle

Annotation:

In this study, the efficiency of high-pressure treatment (HHP, 250 - 450 MPa) with the combination of heat treatment (20 - 70oC) on peroxidase (POD) and lipoxygenase (LOX) inactivation in green beans, green peas and carrots was investigated for blanching purposes. Two steps treatments were also performed by pressurization at 250 MPa at 20°
C for 15- 60 min and then by water blanching at 40-70°
C. For green beans, 25 % residual activity was obtained by water blanching at 50°
C for 15 min after the pressurization at 250 MPa for 60 min. The enzyme inactivation in green peas was 78 % with water blanching at 50oC for 30 min after holding at 250 MPa for 60 min. When the carrots were water blanched at 50°
C for 30 min after HHP treatment at 250 MPa for 15min, 13 % residual activity was obtained. During the experiments, the stability gain or the activation of latent form of the enzymes were observed prior to inactivation. For carrots, LOX activity could not be measured. For green beans, 22 % LOX inactivation was obtained by holding at 250 MPa for 15 min and then by water blanching at 40°
C for 5 min. For green peas, the multiple treatment of 250 MPa for 30 min and water blanching at 50°
C for 30 min provided 70% inactivation. To obtain the enzyme inactivation higher than 90 % for blanching purposes, the pressure applied must be increased. Key words: high hydrostatic pressure, green bean, green pea, carrot, blanching, peroxidase, lipoxygenase

APA, Harvard, Vancouver, ISO und andere Zitierweisen

23

Lam, Wai-yip Michelle, und 林偉葉. „A study of the problems and welfare needs of female manufacturing workers in Wong Chuk Hang area“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1990. http://hub.hku.hk/bib/B31248615.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

24

Miralles, Martínez Pedro. „Seda, trabajo y sociedad en la Murcia del siglo XVII“. Doctoral thesis, Universidad de Murcia, 2003. http://hdl.handle.net/10803/10767.

Der volle Inhalt der Quelle

Annotation:

En esta tesis se analiza la sociedad de Murcia en el siglo XVII a través de los procesos de producción, manufactura, comercialización y detracción fiscal de la seda, con las finalidades de explicar la movilidad y la reproducción social de las elites surgidas del comercio sedero, así como indagar en las circunstancias que posibilitaron o no la formación de una grupo social burgués. La seda contribuyó a la caracterización de la sociedad murciana como una formación económica y social que tiene como principio fundamental la perpetuación y la reproducción social. Sin embargo, en esta estructura social existían algunas posibilidades de mejorar la condición que se ocupaba en la misma. Los actores sociales actúan para mejorar y garantizar su posición en la sociedad, ésta es más importante que la posesión de bienes materiales; no obstante, la riqueza y las relaciones sociales son imprescindibles para la lucha individual y familiar por el honor.
The essential thesis is to analyse the Murcian society in the seventeenth century through the process of production, manufacture, commercialization and fiscal taxation of the silk. In the same way it has the purpose of explaining the social mobility and social reproduction of the elite which arose out of the silk trade, and doing research in the circumstances which made possible or did not the formation of a social middle class group, the bourgeoisie. The silk contributed to the characterization of the society of the seventeenth century as an economical and social formation that has the perpetuation and the social reproduction as fundamental principle. The social protagonists acts in order to improve and guarantee their position in the society, this one is more important than the possession of goods; nevertheless, the wealth and the social relations are essential for the individual and family fight to get the honour.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

25

Germundsson, Frida, und Nicole Kvist. „MDR 2017/745 - New EU Regulation for Medical Devices: A Process Description for EHR Manufacturers on How to Fulfill the Regulation“. Thesis, KTH, Medicinteknik och hälsosystem, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279137.

Der volle Inhalt der Quelle

Annotation:

On the 26th of May 2021 the new regulation for medical devices, MDR 2017/745, will come into force. The underlying incentives to go from the medical device directive (MDD 93/42/EEC) to MDR are a series of adverse events involving medical devices. The main goal of MDR is to strengthen and improve the already existing legislation and thus will entail large changes for manufactures, one of them being manufacturers of Electronic Health Record (EHR) systems. For medical software, such as EHR systems, the new regulation will imply an upgrade in risk classification. This upgrade will bring additional requirements for EHR manufacturers. Furthermore, the released guidelines have been insufficient regarding the specific requirements for medical device software and thus EHR manufacturers are in need of tools and guidance to fulfill MDR. This thesis examines the new regulation for medical devices and thus identifies main requirements for EHR manufacturers. A qualitative approach was conducted comprising a literature study as well as a document study of the medical device regulation along with interviews with experts within the field of medtech regulatory affairs and quality assurance. The information gathered was analyzed to create a process description on how EHR manufacturers are to fulfill MDR. The process description is a general outline and presents the main steps on the route to be compliant with MDR in a recommended order of execution. The main steps are: divide the system into modules, qualify the modules, classify the modules, implement a quality management system, compile a technical documentation, compile the declaration of conformity, undergo a conformity assessment and finally, obtain the CE-mark. To each of the main steps additional documentation provides further information and clarification. The process description functions as a useful tool for EHR manufacturers towards regulatory fulfillment. Even though the process description is created for EHR manufacturers, it can be useful for other medical device software manufacturers. The process description provides an overview of the path to a CE mark and functions as a guidance. It can be used in educational purposes as well as to serve as a checklist for the experienced manufacturer to make sure everything is covered. However, it is not sufficient to rely solely on the process description in order to be in full compliance with MDR. Moreover, there is still a need for further clarifications from the European Commission regarding specific requirements on medical device software.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

26

Allauca, Morales Milagros Yocelin, und Tomayquispe Yenifer Inca. „Modelo de Estandarización del Trabajo aplicando herramientas de Lean Manufacturing para disminuir mermas en el proceso de producción en Mypes del sector de alimentos“. Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/655430.

Der volle Inhalt der Quelle

Annotation:

Las micro, pequeña y medianas empresas representan el 99,5% del total de empresas a nivel nacional y son el motor económico generando 8,4 millones de empleos. Sin embargo, presentan una baja tasa de supervivencia de 67,5% y solo el 20% cuenta con un plan de negocio antes de iniciar sus operaciones. Además, se enfrentan a otros problemas como la falta de planificación y perfeccionamiento de los procesos productivos. Así, la falta de estandarización del trabajo en los procesos de producción origina pérdidas para la empresa debido a la generación de mermas, tiempos improductivos, y reprocesos. Por ello, se diseñó un modelo de estandarización del trabajo aplicando herramientas del Lean Manufacturing con el fin de reducir desperdicios e incrementar la productividad. Para su elaboración se tomó como base los modelos planteados por Cesar J. y Sharma S.S. La validación del modelo se realizó en una Mype productora de snacks, de la cual el diagnóstico inicial identificó como principales problemas la generación de mermas y desplazamientos innecesarios a causa de la variación del método de trabajo utilizado por operario y una inadecuada distribución de planta. Después de la aplicación del modelo, se redujeron las mermas del proceso de producción en 59.58%, se redijo en tiempo de parada de mantenimiento en 50.88% y se incrementó la productividad a 74.4% concluyendo que el modelo planteado reduce los desperdicios e incrementa la productividad.
Micro, small and medium-sized companies represent 99.5% of the total number of companies nationwide and are the economic engine, generating 8.4 million jobs. However, they have a low survival rate of 67.5% and only 20% have a business plan before starting their operations. In addition, they face other problems such as the lack of planning and improvement of production processes. Thus, the lack of standardization of work in production processes causes losses for the company due to the generation of waste, unproductive times, and reprocessing. For this reason, a work standardization model was designed applying Lean Manufacturing tools in order to reduce waste and increase productivity. For its elaboration, the models proposed by Cesar J. and Sharma SS were taken as a basis. The validation of the model was carried out in a snack-producing Mype, of which the initial diagnosis identified as main problems the generation of waste and unnecessary displacements due to the variation of the working method used by the operator and an inadequate plant layout. After the application of the model, the losses of the production process were reduced by 59.58%, maintenance downtime was reduced by 50.88% and productivity was increased to 74.4%, concluding that the proposed model reduces waste and increases productivity.
Trabajo de investigación

APA, Harvard, Vancouver, ISO und andere Zitierweisen

27

Hinners, Linda. „De fransöske handtwerkarne vid Stockholms slott 1693–1713 : Yrkesroller, organisation, arbetsprocesser“. Doctoral thesis, Stockholms universitet, Konstvetenskapliga institutionen, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-73943.

Der volle Inhalt der Quelle

Annotation:

The thesis deals with French sculptors and painters active around 1700 at the Royal Palace in Stockholm. They were summoned from Paris by the architect Nicodemus Tessin the younger (1654–1728). This study analyses the Frenchmen’s professional roles, how Tessin organised their work and the working methods applied in the decoration of the Gallery of Charles XI and the adjoining parade rooms. It also involves questions concerning the artist’s roles and the status of artistic professions at the early modern period. The artisans were a group of some fifteen sculptors, painters, founders and a goldsmith. Several of them were accompanied by family members, some of whom were active in the workshop. In France these sculptors and painters had worked in the Bâtiments du Roi and particularly at the Gobelins. Although they were not part of the artistic elite at the Académie Royale de Peinture et de Sculpture they had vital knowledge in classical pattern/design, le bon goût and drawing. The artisans were also members of the guild system and were thus permitted to accept private commissions. My aim has been to clarify the artisans’ background in Paris and the recruitment undertaken by the diplomat Daniel Cronström (1655–1719). With regard to their activities in Sweden, it has been important to clarify their conditions in the building organisation at the Royal Palace, including social contexts such as their family situation and the possibility to practise their Catholic faith. Equally important is the professional relationship between the Frenchmen and Tessin, who was appointed Superintendent in 1697. Through detailed archival studies, the working practices and the creative process are analysed, especially the collaboration between Tessin and the painter Jacques Foucquet and the sculptors René Chauveau (1663–1722) and Jacques Foucquet (1639–1731).

APA, Harvard, Vancouver, ISO und andere Zitierweisen

28

Castañeda, Iquira Mirella Guadalupe, und Suazo Diana Sangama. „Modelo de mejora basado en herramientas del Lean Manufacturing para reducir productos defectuosos en una empresa peruana de alimentos“. Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/654445.

Der volle Inhalt der Quelle

Annotation:

Actualmente, las empresas de alimentos en el Perú presentan una serie de deficiencias internas que contribuyen a la aparición de problemas críticos, como es el caso de los productos defectuosos. Por ello, la presente investigación propone un modelo de mejora para reducir el índice de defectos en la fabricación de productos alimenticios, mediante la estandarización del trabajo y la aplicación de herramientas del TPM. Asimismo, este modelo es desarrollado bajo un enfoque de Gestión del Cambio, con el fin de eliminar la resistencia de los trabajadores frente al cambio en su cultura laboral. La efectividad del modelo fue validada mediante una simulación con el Software Arena, obteniendo como principal resultado la reducción del porcentaje de defectos de 23.5% a 12.5%, en la empresa del caso de estudio. Esto permite concluir que el desarrollo de la propuesta mejora la calidad de la producción, lo que a su vez representa una oportunidad para obtener mayores ingresos para la empresa.
Currently, food companies in Peru have a series of internal deficiencies that contribute to the appearance of critical problems, such is the case of the defective products. Therefore, this research proposes an improvement model to reduce the rate of defects in the manufacture of food products, through the standardization of work and application of TPM tools. Likewise, this model is developed under a Change Management approach, in order to eliminate the resistance of the workers against the change in their work culture. The effectiveness of the model was validated through a simulation with the Software Arena, obtaining as the main result the reduction of the percentage of defects from 23.5% to 12.5%, in the company of the case study. This allows to conclude that the development of the proposal improve the quality of production, which in turn represents an opportunity to obtain higher income for the company.
Trabajo de investigación

APA, Harvard, Vancouver, ISO und andere Zitierweisen

29

Marebane, Prelly Mohweledi. „A study of multicomponent gas mixtures using various analytical methods for stack emission measurements“. Thesis, 2017. https://hdl.handle.net/10539/24984.

Der volle Inhalt der Quelle

Annotation:

A dissertation submitted to the Faculty of Science, University of the Witwatersrand, in fulfillment of the requirements for the degree Master of Science. Johannesburg, 2017.
Multicomponent gas mixtures are inherently challenging to produce in the laboratory because of matrix effects, boiling points and reactivity amongst other factors. Therefore, methods must be continuously developed to control these challenges. The purpose of this work was to study these complex gas mixtures to improve their measurements with emphasis on the reduction of uncertainty. There are three critical steps to be followed in gas metrology for primary reference gas mixtures of the highest metrological level; purity analysis of source gases, gravimetric preparation and verification/validation which includes stability testing. Purity analysis of select source gases was quantified using various techniques. This methodology incorporated the use of molar masses and their uncertainties in order to obtain purity values for the chemical composition of gas mixtures. While many preparation methods such as permeation and dynamic methods are available, a static gravimetric method was used to prepare the complex stack and automotive gas mixtures following International Standard Organisation: 6142-1. For the mole fraction range of interest, four components (carbon dioxide, carbon monoxide, sulphur dioxide and nitric oxide) excluding propane, were obtained from analysis by non-dispersive spectroscopy techniques calibrated by several standard gas mixtures of different mole fractions. Propane was analysed by a gas chromatograph coupled with flame ionisation detection. Multipoint calibration was used to evaluate the linearity or nonlinearity of the detector. The final results for the stack gas mixture components showed an achievement of 0.4% to 0.8% percentage relative expanded uncertainty and 0.4% to 1.3% for carbon dioxide depending on the matrix of the standard gas mixtures used, 0.5% to 1% for propane, 0.8% to 1.8% for nitric oxide, 2% to 6% for carbon monoxide and 0.3% to 2.3% for sulphur dioxide. One of the most important suppositions drawn was the incidence of synergistic effects associated with calibration by nonrepresentative standard gas mixtures when these were used for analysis for some of the components of stack mixtures. To evaluate improvements in measurement capability, the results of the current work were compared to the data of the laboratory in 2008-2011 and there was an improvement in the measurement of carbon dioxide, carbon monoxide, propane and nitric oxide. These improvements are attributed to rigorous purity analysis of starting materials, reduction of uncertainty and developments in measurement expertise. In this work, different measurement and calibration methods were used to analyse the components of the new stack gas mixtures. The stability of these components was evaluated by analysing them at different times and the statistical D-test was used to check for significant instability. An unknown stack sample was compared with the standard gas mixtures prepared for this work. In combination with same matrix and same concentrations, single point calibration was found suitable for stack gas measurement. To reiterate the concept of matrix effect, the results of carbon dioxide in a mixture containing carbon monoxide and oxygen as well in nitrogen, were used to show how differences in matrix often give erroneous results and same conclusions cannot be made for different mixtures. While the data of this measurement was unsatisfactory, an improved method developed for this type of emission multicomponent was very successful. Emission industries also require automotive primary reference gas mixtures. These are equally important and complex multicomponent mixtures measured and improved in this work. A very precise and repeatable single point method was developed for the analysis of the components of automotive mixtures. The repeatability of the gas chromatography method was 0.2% for oxygen, 0.1% for carbon monoxide, 0.5% for carbon dioxide and 0.3% for propane. The percentage relative expanded uncertainty was 0.4% for oxygen, 0.8% for carbon monoxide, 0.8% for carbon dioxide and 0.5% for propane. However, its limitation was the use of different calibration gases for each analysis. This led to inconsistencies in the calculated mole fractions, non-predictability and instability. A proficiency testing scheme was coordinated by the laboratory for automotive emission as part of this study. Given the complexity of the samples, the work aimed to check any improvements that could be made to the capability of measurement over the years. This new method using gas chromatography coupled with different detectors (residual gas analyser) was successful in verifying the gravimetric values very V accurately. Finally, the results of the stack gas mixtures were ≤1% relative except carbon monoxide and ≤1% for automotive mixtures. This work aimed to support the emission industry by providing it with representative and accurate reference gas mixtures, extend the accreditation scope of the laboratory and improve its calibration and measurement capability for multicomponent gas mixtures.
LG2018

APA, Harvard, Vancouver, ISO und andere Zitierweisen

30

Poppendieck, Dustin Glen. „Polycyclic aromatic hydrocarbon desorption mechanisms from manufactured gas plant site samples“. Thesis, 2002. http://wwwlib.umi.com/cr/utexas/fullcit?p3108498.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

31

Muvhiiwa, Ralph Farai. „Theoretical and experimental analysis of biomass gasification processes using the attainable region theory“. Thesis, 2018. http://hdl.handle.net/10500/25610.

Der volle Inhalt der Quelle

Annotation:

Text in English
There are limits on performance of processes and reactions set by material balances and by thermodynamics. The interaction of these theoretical limits and how they influence the behaviour of reactions and equipment is of interest to researchers and designers. This thesis looks at the conversion of biomass to gaseous products under various conditions, including a range of temperatures from ambient to 1500 ⁰C and in the presence or absence of oxygen. The limits of performance of the material balance can be represented as an Attainable Region (AR) in composition or extent space; we call this the MB-AR. The MB-AR represents all possible material balances that can be achieved for a given a set of feeds and set of possible products. The dimension of this space depends on the number of independent material balances. The extreme points of the MB-AR are of particular interest as these define the limiting compositions and the edges of the boundary of the MB-AR represent the limiting material balances. The MB-AR does not depend on temperature. The thermodynamic limits of performance of can be represented as an AR in the space of Gibbs Free Energy (G) and Enthalpy (H); this is called the G-H AR. The G-H AR is always two dimensional, no matter what the dimension of the MB-AR. Extreme points in the G-H AR are also extreme points in the MB-AR are; however not all extreme points in the MB-AR are extreme points in the G-H AR. The extreme points in the MB-AR are transformed by calculating G and H of the points at the condition of interest (reaction temperature and pressure). It is then necessary to find the convex hull in G-H space of this set of transformed points which gives us the boundary of the G-H AR. The extreme points in the G-H AR can be associated with material balances and the extreme point with the minimum G represents the global equilibrium or equivalently the most favoured material balance for the system. The edges of G-H AR are defined by the lines between neighbouring extreme points in the boundary of the G-H AR. These edges represent the limiting material balances in terms of defining the extremes of the G and H of the system. The G-H AR depends on the feed and products through the MB-AR, but also depends on temperature (and pressure). The set of points which are extreme points of both the MB-AR and the G-H AR changes with temperature. Geometrically, the transformed set of extreme points for the MB-AR moves in the GH space as temperature is changed and they move at different rates. Hence when finding the convex hull in the G-H space of the transformed extreme points of the MB-AR, G-H points become either boundary (extreme) points or move into the convex hull at different temperatures. Thus, the material balance which corresponds to the global minimum in G may change with temperature, as do the material balances which are associated with the edges of the G-H AR. Experiments are performed on biomass anaerobically at ambient temperature using microbes as the catalyst, and the products of this process are called biogas. The experiments were performed in a nitrogen plasma system on biomass at higher temperatures (400 ⁰C to 1000 ⁰C) also in the absence of oxygen, and this process would typically be referred to as pyrolysis. Oxygen was added to the plasma system and operated at temperatures between 700 ⁰C and 900 ⁰C, and this would typically be referred to as gasification. Thus, it was able to change the MB-AR by presence or absence of oxygen. By changing operating temperatures, the G-H AR is effectively changed with either the same or different MB-AR’s. The experiments show that in all cases, the product tends towards minimum G. Although this might not be surprising at the higher temperatures, minimizing G is not thought to be the driving force in microbial systems. An important insight from this is that if one were to try and make hydrogen only in a biological system, the system would need to have organisms that make hydrogen only. This is because the material balance that produces hydrogen has a lower change in G than the material balance that make methane. Thus, if there was a consortium of organisms and some of them could make methane, the methane producing organisms would dominate as they have the higher Gibbs Free Energy driving force. If the boundary of the G-H AR around the minimum G is fairly flat, or if many of the extreme points of the MB-AR lie close to the minimum G in the boundary of the G-H AR, then there are many material balances that will give the same G and H. Thus, there are a range of compositions with similar G and H and how one approaches the minimum G will determine the chemical composition of the product. This has important implications for the design, scale up and operation of equipment if a particular product is desired rather process efficiency. The low temperature anaerobic route to gasifying waste, using microbes as catalysts, has a very simple G-H AR, and the preferred products are CH4 and CO2, known as biogas. These units should be relatively stable to operate as none of the other products have G’s that are as negative as that of the biogas. Although not part of this thesis, small-scale anaerobic digesters were installed in communities and these do run easily and stably with fairly little intervention from the operator which seems to support our conclusion. We however could ask, why then have simple technologies, such an anaerobic digestion, not been widely adopted in Africa? To this end we worked with communities and spoke to people about their knowledge about the technology, their concerns and their possible interest in using new approaches to supply energy for cooking and lighting. We found that people were not aware of the technology but would be very interested in adopting a technology that supplied energy cheaply. To our surprise however, their major concern was around hygiene and safety, in that if the gas was made from “poo” how could the gas be clean and would cooking with it not contaminate the food and make people sick? This in hindsight is a very reasonable concern, although it had never occurred to us that this would be a perception. Engineers will have to work with social scientists and psychologist, amongst others, to address the concerns and needs of communities in order for sustainable technologies to be successfully adopted by communities. In summary, this thesis presents a tool for analysing biomass conversion to gaseous products in general, whether microbial or thermal. This tool gives insight into what is achievable, what the major factors are that affect the favoured product and how this can be manipulated to improve efficiency from an overall material and energy point of view.
Physics
D. Phil. (Physics)

APA, Harvard, Vancouver, ISO und andere Zitierweisen

32

Hsu, Chen Hao, und 徐晨豪. „Work motivation, work engagement and life satisfaction : A case of DRAM manufacturer“. Thesis, 2016. http://ndltd.ncl.edu.tw/handle/9ngt66.

Der volle Inhalt der Quelle

Annotation:

碩士
長庚大學
商管專業學院碩士學位學程在職專班經營管理組
104
The research motivation is embedded in the context that the improvements of capacity of employee have been a critical issue for abundant of enterprises or organizations, such as positive psychic energies, individual merits, and positive mental energies. To effectively excite employees, therefore, enterprises or organizations are able to improve employees’ work engagement and then strengthen their working dedications; furthermore, working dedications are able to be filled with life satisfactions. The questionnaires are adopted, and the results are as follows, with 154 shares of effective returned questionnaires: 1. The higher the years of service and the intrinsic incentives, the higher prediction of the work engagements. 2. The higher the work engagements, the higher prediction of the life satisfactions; on the contrary, the higher extrinsic incentives, the lower prediction of the life satisfactions. 3. The higher the working hours and the periods of following immediate supervisors, the higher prediction of work performances.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

33

Mhlongo, Philisiwe Kenlly. „Adverse effects of shift work at a biscuits manufacturer“. Thesis, 2017. http://hdl.handle.net/10321/2588.

Der volle Inhalt der Quelle

Annotation:

Submitted in fulfilment of the requirements for the Degree of Masters in Technology: Environmental Health, Durban University of Technology, 2017.
Shift work is a necessity for many organizations. Reasons for shift work are mainly to ensure continuous and optimized operations. Many studies on shift workers have concluded that it can lead to adverse physiological, social and psychological health effects. This study examines challenges associated with working shifts at a biscuits manufacturing factory. Results should be able to assist the employer in implementing effective interventions directed at limiting the negative effects of shift work on employees. This is a convergent parallel design multi method stud among 152 shift workers in a biscuits manufacturer located in Durban, KwaZulu Natal. An abbreviated and modified form of the validated SSI questionnaire was used (Barton et al. 1995). The questionnaire contained a battery of items designed to examine the relationship of health and personal adjustment to shift work. Owing to the exploratory nature of the study, a focus group methodology was also used and this allowed for in-depth qualitative research which catered for a more comprehensive understanding of the current shift work issues. A retrospective review of injury records of employees who sustained occupational injuries between 2012 and 2013 was also conducted. The sample comprised of 85 (56%) males and 63 (42%) females. Logistic regression was used to estimate the association between shift work and the likelihood of sleep disturbance, poor health outcomes and limited time for social and domestic activities, adjusting for age, sex, partner working, years working night shift, marital status, job class and years employed. Odds ratio (OR) for reported sleep disturbance was slightly higher among women (OR=1.65; 95% CI = 0.25; 10.84; p < 0.05) compared to males, but this was not statistically significant. Longer shift work experience (i.e.11-20 years) was significantly associated with better health status (OR=0.18; 95%CI = 0.06; 0.46; p < 0.05). Shift work experience (11 to 20 years) was also found to be significantly associated with limited time for both social (OR = 0.10; 95%CI = 0.03; 0.30) and domestic activities (OR= 0.25; 95% CI = 0.11; 0.57; p < 0.05) (Table 4). Age had no effect on social and domestic activities, but those 40 years and above were more likely to have limited time for social and domestic activities (OR = 3.06; 95%CI =0.60; 15.60 and OR= 2.5; 95%CI=0.47; 13.06). Those with more shift work experience seemed to have more time for social and domestic activities compared to those with less than 10 years experience. Findings from the FGD’s revealed that most participants (91%) did not get sufficient sleep time after night shift; this was mainly because of the chores they had to do after getting home form night shift and disturbances from the household and neighbours. The average time spent sleeping by majority of participants after night shift was 5 hours. Swollen feet, gastric, sleep disorders, indigestion and headaches were some common complaints experienced by shift workers in this study. About 27% of participants reported to have been injured at work before. These incidents were reported to be related to drowsiness and fatigue. The company’s incident records showed a total of 160 injuires between 2012 and 2013, of which 38 occurred during night shift. In 2012, the company recorded 65 injuries which included 51 first aid (FA) injuries, 6 minor injuries (MI) and 8 lost time (LT) injuries, as categorized by the company. 2013 had the highest number of incidents, with 95 total injuries, averaging to 7.9 injuries annually. There were 84 first aid incidents recorded for year 2013, 9 minor injuries and only 2 lost time injuries. Twenty three percent (15, n=65) incidents occurred during night shift in year 2012, of which 11% (7, n=65) were females. The number of night shift incidents slightly increased to 24% (23, n=95) in 2013 and females accounted for 9.40%. The records showed that majority of injuries happened between 17h00 and 21h00 at night. Results of this study provides evidence that shift work impacts negatively on the lives of the employees and can lead to adverse health outcomes such as poor dietary intake, headaches and swollen feet to mention but a few.
M

APA, Harvard, Vancouver, ISO und andere Zitierweisen

34

Santos, Vasco Daniel Carvalho Ferreira dos. „Quality assessment of manufactured ceramic work using digital signal processing“. Master's thesis, 2004. http://hdl.handle.net/10216/12232.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

35

Santos, Vasco Daniel Carvalho Ferreira dos. „Quality assessment of manufactured ceramic work using digital signal processing“. Dissertação, 2004. http://hdl.handle.net/10216/12232.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

36

Lai, An-Ju, und 賴安洳. „Work Stress and Mental Health of the Employees in a Taiwan Manufacture“. Thesis, 2013. http://ndltd.ncl.edu.tw/handle/07794197371106601886.

Der volle Inhalt der Quelle

Annotation:

碩士
東海大學
工業工程與經營資訊學系
101
Workplace occupational safety health and healthy promoting subject is more importuned in an enterprise. The purpose of this study is to discuss the relationship between work stress and mental health of conventional industries workers. It hopes could to advance a workplace healthy promoting and health manage. This study applied cross-sectional questionnaire survey, aiming 1010 conventional industries workers of distributed of Taiwan. A total of 950 effective samples were collected with an effective rate of 94.05%.The study’s first part is Effort-Reward Imbalance model that is applied as the evaluation tool for work stress, and the second part is the Taiwanese Depression Scale that is used for mental health evaluation. This study result shows the conventional industries workers is the more effect mental health of work stress on extrinsic effort(β=0.320，p＜0.01)、on intrinsic effort(β=0.552，p＜0.01)、social status feedback(β=-0.332，p＜0.01)and money feedback(β=1.121，p＜0.01).The less effect mental health of work stress is on self-esteem feedback.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

37

Gong, Yuh-Shyan, und 龔育賢. „The Investigation of Labor Work Hazards in Photoresist Manufacture of Optoelectronic Industry“. Thesis, 2011. http://ndltd.ncl.edu.tw/handle/01354448348409300139.

Der volle Inhalt der Quelle

Annotation:

碩士
嘉南藥理科技大學
產業安全衛生與防災研究所
99
Optoelectronics industry in Taiwan is an important high-tech industry. However, there are increasing musculoskeletal discomfort reports of clean-room workers engaged in the optoelectronics industry. This study aimed to investigate labor work hazards led by photoresist of optoelectronic industry. The subjects of this cross sectional study who are 50 on-site manufacturing and 20 quality control staffs working in clean rooms of a photoresist manufacturing company are conducted to assess the working conditions and skin problems by the self-designed structural questionnaire. Nordic Musculoskeletal Questionnaire (NMQ) was adopted to investigate the musculoskeletal symptoms and relevant skin problems and MSDs was utilized to analyze the risk factor in field work. Chi-square test was used analyze the relationship between risk factors exposure and symptoms. On-site manufacturing workers have the higher prevalence of body pain symptom than quality control personnel, especially the high proportion in neck, shoulders, upper back, hands, lower back or waist with 54%, 52%, 52% 58%, 66% accordingly. The major body part pain complained by the on-site manufacturing staffs has certain relationship with the work contents, including the neck and the raising total time (2hrs) of hands over the shoulders, the upper back and the twister total number (11 ~ 20 times) of waist, the wrist and forceful pinch total time (2hrs) of finger, lower back or waist and total weight of goods carried (10 kg ~ 50 kg), lower back or waist and the twister total number (11~ 20 times) of waist. The major body part pain complained by the on-site manufacturing staffs has certain relationship with the body movements, such as neck and clean-up, upper back and raw materials injecting process, wrist and filling, as well as lower back or waist and raw materials pre-processing. The above-mentioned are significantly correlated (P <0.05) in statistics. The on-site manufacturing staffs also have higher prevalence of skin discomfort than quality control personnel, especially the highest hand back ratio (52%) with statistically significant correlation (P <0.05). There are 16 staffs (32%) were diagnosed with contact dermatitis in the 50 manufacturing personnel subjects. In which, there were 15 patients (30% of the total on-site manufacturing staffs) belonged to stimulus contact dermatitis and occurred mainly in hands. Photoresist manufacturing workers have a high proportion of musculoskeletal discomfort and skin problems that have to be prevented by personal protection and ergonomic designs in the future.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

38

Tasi, Lin Liang, und 蔡林亮. „The relationship among work values, organizational climate, and job satisfaction for the manufacture workers“. Thesis, 1993. http://ndltd.ncl.edu.tw/handle/37356908726472991245.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

39

Chiou, Chi-feng, und 邱啟峰. „From Construction Industry Act to profession engineering manufacturer management - take water-proof works industry as example“. Thesis, 2008. http://ndltd.ncl.edu.tw/handle/4wx3wu.

Der volle Inhalt der Quelle

Annotation:

碩士
國立中央大學
土木工程學系碩士在職專班
96
“Construction Industry Act” is divided into three parts, which are “comprehensive construction enterprises”, “specialized construction enterprises” and “civil engineering contractors”﹐“specialized construction enterprises” is linked to public safety and professional engineering operator, we fix the law and make the manufacturers operating professional works supplemented or altered under Subparagraph 13, Article 8 shall apply for renewal within 2 years commencing from announcement。But up to this day has still not saw direct office practicable this a stipulation. The focus of my research is based on the examining of water-proof works industry, by inquiring practice behind “Construction Industry Act” to specialize manufacturer developing affection。In order to declare legal and management problem and present the situation, I then categorize questionnaire survey of the constriction workers。 Finally, I will attempt to re-assess the value of direct office in the conjunction relationship with related industry, enterprises and indemnification, for the “specialized construction enterprises” works rights and interests。Also I draw out the advices to hope our government can active professional technology certification and broaden “specialized construction enterprises” for full-time engineer by “technician Grade A” to match the manufacturers actual requirement。It will be of promoting professional manufacturer''s technology and enhance the statute of engineering quality.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

40

Ruiz, Juan Jesús Ayas. „Contribution on new developments of composites materials manufactured by infusion process for their implementation in civil works“. Master's thesis, 2019. http://hdl.handle.net/10884/1430.

Der volle Inhalt der Quelle

Annotation:

There are still many unknowns regarding the behavior of composite materials in the long term and in-service conditions; in particular those related to their behavior to cyclic loads, with the loss of resistance they experience over time and with their fire protection. Composite materials result from the combination of two or more materials which, when used separately, they may not present adequate properties to be used as construction materials but, when they are well combined resulting in a material which maintain an identifiable interface surface, they constitute a new material that symbiotically merges the best properties of the original materials. The composite materials studied in this work are constituted by two phases called fiber reinforcement and thermoset matrix. The fiber reinforcement is responsible for the mechanical performance material, providing most of its strength and stiffness. The polymeric of thermoset matrix acts as the glue of the composite material, guaranteeing the load transfer between the fibers and also between the applied loads and the composite itself. In addition to the resin, the polymeric resin often incorporates fillers and additives that may reduce production costs, improve the manufacturing process itself and improve specific properties of the final product. A clear example of it widely used in construction is the incorporation of alumina trihydrate to enhance the fireproof properties of the composite. Today a large number of fibers and polymeric matrices presenting different characteristics are commercially available. The judicious combination of the constituent’s materials has enabled the development of a wide range of products that have been used in very different structural applications, featuring several advantages when compared with traditional materials. A general overview of the potential materials having potential uses and applications in construction will be recorded in this work to discuss the general advantages and limitations over traditional materials such as wood, steel and concrete. Unlike other materials, the manufacturing processes used to produce composites will determine their final mechanical properties because among other aspects will determine the ratio fiber to resin as well as the polymerization degree of the polymeric resin. In this way, one of the most used and potential manufacturing processes used in construction is the so-called vacuum-assisted resin transfer moulding (VARTM). One of the distinct advantages of VARTM processes is the ability to build very large parts on relatively inexpensive tooling, aspects which are of high interest in construction. In this thesis work, analysis will be focused in VARTM technology discussing their implementation for to structural components of high interest in construction. The first component is a closed structure with a monolithic laminate combination of glass and carbon fibers. As model of closed structure, a tub was been selected. The second selected component is a structural slab with a sandwich glass composite. VARTM process will be optimized in terms of cost to produce a 1:1 scale prototype. The properties of individual laminates will be tested to model and calculate using finite element theory the properties of the all laminate and the properties of the scale components in terms strength and stiffness. This study will be developed taking into account the technical code of construction as well as the main international guidelines and regulations for the application of composites in construction. Some remarks about the construction products regulation and the CE marking will be also included. It is clear that composite offer numerous advantages over conventional structural systems in the form of higher specific stiffness and strengths but, its advantages is also lower life-cycle costs with additional benefits, such as easier installation and improved safety. For that, due its importance, the environmental impact and live cycle evaluation of the composite materials will be discussed. _____________________________________________________________________________________ Ainda há muitas incógnitas sobre o comportamento de materiais compósitos a longo prazo e em condições de serviço; em particular, aqueles relacionados ao seu comportamento às cargas cíclicas, com a perda de resistência que experimentam ao longo do tempo e com a sua proteção contra incêndio. Os materiais compósitos resultam da combinação de dois ou mais materiais que, quando usados separadamente, podem não apresentar propriedades adequadas para serem usados como materiais de construção, mas quando combinados resultam em um material que mantém uma superfície de interface identificável. material que mescla simbioticamente as melhores propriedades dos materiais originais. Os materiais compósitos estudados neste trabalho são constituídos por duas fases denominadas de reforço de fibra e matriz termoendurecível. O reforço de fibra é responsável pelo material de desempenho mecânico, fornecendo a maior parte de sua resistência e rigidez. A matriz polimérica de termofixa atua como cola do material compósito, garantindo a transferência de carga entre as fibras e também entre as cargas aplicadas e o próprio compósito. Além da resina, a resina polimérica geralmente incorpora cargas e aditivos que podem reduzir os custos de produção, melhorar o processo de fabricação e melhorar as propriedades específicas do produto final. Um exemplo claro disso amplamente utilizado na construção é a incorporação de tri-hidrato de alumina para melhorar as propriedades à prova de fogo do compósito. Atualmente, um grande número de fibras e matrizes poliméricas apresentando características diferentes estão comercialmente disponíveis. A combinação criteriosa dos materiais constituintes permitiu o desenvolvimento de uma ampla gama de produtos que foram utilizados em aplicações estruturais muito diferentes, apresentando várias vantagens quando comparados com materiais tradicionais. Uma visão geral dos materiais potenciais com potenciais usos e aplicações em construção será registrada neste trabalho para discutir as vantagens e limitações gerais sobre materiais tradicionais como madeira, aço e concreto. Ao contrário de outros materiais, os processos de fabricação usados para produzir compósitos determinarão suas propriedades mecânicas finais, porque entre outros aspectos, será determinada a relação fibra / resina, bem como o grau de polimerização da resina polimérica. Deste modo, um dos processos de fabrico mais utilizados e potenciais utilizados na construção é o denominado mouldador de transferência de resina assistida por vácuo (VARTM). Uma das vantagens distintas dos processos VARTM é a capacidade de construir peças muito grandes em ferramentas relativamente baratas, aspectos que são de grande interesse na construção. Neste trabalho de tese, a análise será focada na tecnologia VARTM discutindo sua implementação para componentes estruturais de alto interesse em construção. O primeiro componente é uma estrutura fechada com uma combinação de laminado monolítico de fibra de vidro e carbono. Como modelo de estrutura fechada foi selecionada uma banheira. O segundo componente selecionado é uma laje estrutural com um composto de vidro tipo sanduíche. O processo VARTM será otimizado em termos de custo para produzir um protótipo de escala 1: 1. As propriedades dos laminados individuais serão testadas para modelar e calcular usando a teoria dos elementos finitos as propriedades de todo o laminado e as propriedades dos componentes da escala em termos de resistência e rigidez. Este estudo será desenvolvido tendo em conta o código técnico de construção, bem como as principais diretrizes e regulamentos internacionais para a aplicação de compósitos em construção. Algumas observações sobre o regulamento de produtos de construção e a marcação CE também serão incluídas. É claro que o composto oferece inúmeras vantagens sobre os sistemas estruturais convencionais na forma de rigidez e resistência específicas mais altas, mas suas vantagens também são menores custos de ciclo de vida com benefícios adicionais, como instalação mais fácil e segurança aprimorada. Para isso, devido à sua importância, o impacto ambiental e a avaliação do ciclo vivo dos materiais compósitos serão discutidos.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

41

Clarke, Christina. „The manufacture of Minoan metal vessels: theory and practice“. Phd thesis, 2012. http://hdl.handle.net/1885/151319.

Der volle Inhalt der Quelle

Annotation:

This study aims to establish the equipment and methods used to make hammered metal vessels in Crete during the Bronze Age. It combines archaeological research with metalsmithing practice. The most substantial studies to date have been largely typological. Some have examined the equipment and processes used, but usually without fully taking into account the metalsmithing techniques involved in vessel manufacture. An understanding of the equipment required and the manner in which it is used provides a new perspective on the Minoan craft and its practitioners. The initial stages of the study involved investigating Minoan vessel types and characteristics, and studying excavation reports on Bronze Age metallurgical sites in Crete as well as publications on the metallurgy of Minoan Crete and other Bronze Age cultures. The second stage was the detailed examination of a number of Minoan vessels in collections in Crete and the UK. The final stage was to replicate tools and equipment found at Minoan metallurgical sites and to test their viability for making Minoan metal-vessel forms. The processes involved annealing, the application of different hammering methods, riveting and polishing techniques. These reconstructed processes led to the creation of two small bowls, a hydria made from separate sections and a one-handled basin. The results of this research and the replication of equipment and techniques made it possible to reconstruct the processes used to make these vessels. Several other discoveries were made which have broader implications. Firstly, the reconstructive process revealed some of the physical aspects of the craft which would have affected the working practices of Minoan smiths and the roles of individuals within a workshop. Secondly, the study showed that simple tools found at many Minoan metallurgical sites are very effective for creating these vessels. Furthermore, the results suggest that metalsmithing may have occurred at more locations than are currently recognised as metallurgical sites. Lastly, it was discovered that both the forms and the often large sizes of Minoan vessels and, by extension, many Mycenaean vessels were determined by the types of tools that the smiths used. This has implications for how we might interpret these vessels within the broader context of the metal-vessel traditions of other contemporary cultures. -- provided by Candidate.
v. 1. Text -- v. 2. Figures

APA, Harvard, Vancouver, ISO und andere Zitierweisen

42

WONG, YU-CHENG, und 翁譽誠. „Correlation between dispatched employees’ personality traits and their work performances within the manufacture department－Case of A company“. Thesis, 2010. http://ndltd.ncl.edu.tw/handle/35586302875009944008.

Der volle Inhalt der Quelle

Annotation:

碩士
逢甲大學
經營管理碩士在職專班
98
Business globalization is causing enterprises facing the issues from either the global markets, products or various political issues between different countries that is forcing them to search for new strategies to manage their own companies. “Dispatched Human Resource” idea was widely accepted and applied into many enterprises management strategy. More similar cases being used by enterprises within the recent years, during the hiring process, company chooses to hire job applicants based on their personality traits as an fair and budget-less tool, on the other hand, the new applicants must also receive managing staff’s agreement and trust. Continue to adopt more accurate information into personality traits selection upon different situation will raise managing staff’s trust and further more makes the company able to control the staffing cost and turnover rate. This study is based on the SPSS software as statistic calculating tool, by gathering information from the sample data as follow: factors analyses, reliabilities analyses, frequency distributes and T exam analysis…etc, studies of correlation between individual personality traits and work performances. The results of studies will report to upper management staff and related department managers for references. Key words: Outsourcing, Recruiting tool, Personality characteristic, Social attributes, Work achievements.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

43

HAO, CHANG CHIH, und 張智豪. „A Work Pressure Analysis of Electronic Workers with Example Taken from a PCB Manufacturer Plant A“. Thesis, 2010. http://ndltd.ncl.edu.tw/handle/69937377319276382139.

Der volle Inhalt der Quelle

APA, Harvard, Vancouver, ISO und andere Zitierweisen

44

Huang, Chun-Wei, und 黃淳維. „Stepping Non-Stop on the Electric Sewing Machine:The work and family lives of women who manufacture clothing at home“. Thesis, 2009. http://ndltd.ncl.edu.tw/handle/95000185634693473171.

Der volle Inhalt der Quelle

Annotation:

碩士
高雄醫學大學
性別研究所
97
The main purpose of this paper is to examine the experiences of women manufacturing clothing at home while also doing domestic work. As the pay for manufacturing clothing at home is not much, the work and its value are often regarded as insignificant. Domestic work is viewed as the main task of women working at home, so the value of their work is easily underestimated. How to look at the monetary value of the clothing manufacturing work done on sewing machines at home is one of the focuses of this paper. Secondly, this paper aims to discuss (1) the way women coordinate clothing manufacturing work with domestic work, and (2) how they identify their work at home, which impacts on their work experience. This paper adopted Glucksmann’s TSOL (Total Social Organization of Labor) Theory, putting an emphasis on the relationships between different types of work that are affected by the social structure, time, and space. Using a qualitative research interview method, 10 women doing clothing manufacturing work at home were interviewed. The findings are as follows: Aside from the “additional income for the family” provided by a female manufacturing clothing at home, it is difficult to evaluate the worth of the woman because it is hard to put a price on her intangible contribution in the various domestic tasks she accomplishes. Nonetheless these should be considered. The experience of women working at home is colored by their sexual roles. Their reproductive roles as wife and mother make it necessary for them to allocate their time and organize their jobs accordingly. As these women choose to work at home in order to be able to take care of the family simultaneously, their time for clothing manufacturing and their time for domestic chores must be apportioned in such a way as to fulfill the needs of both their boss and their family members. Working at home not only creates time-related pressure on them but also makes it more difficult for them to have any time to pursue their own personal interests. In order to both take care of domestic chores while manufacturing clothing at home, these women have to consult with their family members and get them to agree to share the domestic work. How the female identifies with her work at home will determine how the domestic chores will be coordinated. Those who see themselves as mainly housewives tend to take on almost all of the domestic work themselves. Some women require the children to share the burden of domestic work, but this may cause conflict between them and create additional emotional stress for the women when the family members disagree. Those who view themselves as professional workers in clothing manufacturing spend less hours in domestic work and the standards they set for these are relatively lower compared to the abovementioned types of women. However, the conflict they face is in their not being able to be good mothers. Based on the above mentioned, this study discovered that the experience of woman working at home manufacturing clothing can not be analyzed specifically using the rigid binary framework of public vs. private domain and between work with pay and work with no salary. Variables, such as changes in industrial structure, children''s age, marital status, etc., all contribute to the various and complicated facets of the experience of their work.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

45

Chang, Chan-hao, und 張展豪. „The Study on Work Values and Job Satisfaction Toward Turn-over Tendency: An Example of Passive Component Manufacturer“. Thesis, 2012. http://ndltd.ncl.edu.tw/handle/10834539083380857040.

Der volle Inhalt der Quelle

Annotation:

碩士
國立雲林科技大學
全球運籌管理研究所碩士班
100
Enterprises are faced with more competitive environment in the era of globalization, they must come up with new ideas for enhancing organizational performance in order to react to today’s changeable business environment and improve organizational competitiveness. Within the strategies of organizational performance, we can not only improve products quality and hardware devices but also enhance employee’s education and training, do knowledge management, and increase employee benefits. The accumulation of human capital is one of the pragmatic strategies as well. In recent year, employees’ work values has gradually become a fundamental issue for business operators. Employees’ work values surely affect their turn-over tendency. Because of this, understanding employees’ work values is unavoidable because business operators aim to reduce the loss of human capital and the decline of organizational competitiveness. On the other hand, the employees’ work values of passive component manufacturer toward the influence on turn-over tendency is one of the motives of the research. The aim of the study was to find out what the employees of passive component manufacturer are satisfied with and try to reduce their turnover rate. Based on this, job satisfaction towards turn-over tendency was the other aim of the study. Moreover, Closed questionnaire was used, mainly focusing on work values, job satisfaction, and turn-over tendency of the employees of passive component manufacturer. The result showed that work values toward job satisfaction, the scope of “internal satisfaction” and “external satisfaction,” had significant influence, external satisfaction towards turn-over tendency had negative influence, and work values could be improved via job satisfaction and then affected turn-over tendency.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

46

Tsai, Ping-Tse, und 蔡秉澤. „The Study of the Work Stress and Fatigue of a Manufacture Industry Shift Worker(A Case Study of a Steel Plant)“. Thesis, 2013. http://ndltd.ncl.edu.tw/handle/85130700103908782734.

Der volle Inhalt der Quelle

Annotation:

碩士
嘉南藥理科技大學
職業安全衛生系暨產業安全衛生與防災研究所
101
This study used occupational burnout inventory and job content questionnaire to understand the relationship between fatigue and job content of the surveyed employees working at a steel plant. The results show that job title, job characteristics, workplace, physical illness (arthritis, hypertension), physical symptoms (headaches, neck and back pain, sleepless, wrist soreness), personal habits (smoking, drinking, betel nuts), work shift have significant relationship with fatigue and stress. The employer should provide proper recommendations to improve work environment.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

47

Hung-ShengChang und 張鴻生. „A Study of Deploying RFID for the Shop Floor Work-in-process Management for Gear Box Manufacturers“. Thesis, 2013. http://ndltd.ncl.edu.tw/handle/47537869141413585244.

Der volle Inhalt der Quelle

Annotation:

碩士
國立成功大學
工業與資訊管理學系專班
101
For production shop floor management, many companies use manufacturing execution system to effectively record the production information, which can enhance the quality precision of the production. The use of bar codes in information systems can satisfy the above quality requirement, but it is difficult to read on the metal items or in a greasy environment. However, Radio Frequency Identification (RFID), which is invented by a non-contact automatic identification technology, can work in a variety of harsh environments. A RFID system is comprised of the reader, electronic tags, and application system, and which can be integrated into database management, computer networks, and information security systems. RFID can be widely applied in many fields, especially in the commodity production industry. This thesis takes the manufacture of gearboxes as an example to explore the use of RFID technology in the shop floor management system, for managing the production process to assist in stabilities the production quality, reducing production costs and improving the on-site management effectiveness. This study can provide managers with a reference for an useful future business planning in establishing a transparent and timely shop floor management system, to improve the management effectiveness.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

48

Lin, Beihui, und 林倍暉. „The study of the characteristics and particularity of In-house translator, Chinese-Japanese, based on work experience in a Taiwanese tape manufacturer“. Thesis, 2011. http://ndltd.ncl.edu.tw/handle/20107441123398330056.

Der volle Inhalt der Quelle

Annotation:

碩士
輔仁大學
跨文化研究所翻譯學碩士班
99
“In-House Translator” is not an unfamiliar term to Taiwanese businesses; they’re needed at almost all international social events. However, most people assume that in-house translator does not require any specialty or skill, therefore they define it as a simple word for word translation job and greatly underestimate the true value of the role. Due to the importance of profit and loss aspect in all business deals, the role of in-house translator has become more than just mere word for word translating job. Besides sending out the message, the role of in-house translator stresses more about delivering the purposes and objectives of the message. Also, in order to meet business’ expectations, in-house translator needs to consider factors such as the employers and clients’ needs and preferences. 　On top of the basic language skills, an experienced in-house translator can present multi-purpose translation and successfully meet employer’s different needs. In-house translator also acts as a channel to acquire critical industry information. Moreover, being an employee themselves, in-house translators understand the company down to the last detail, which allows them to not just communicate, but to also execute every task for the benefit of the company and to create more business opportunities. This is the irreplaceable role of the in-house translator. 　Due to the fact that in-house translators are under valued in Taiwan, there are few researches being conducted on in-house translators, not to even mention study being done on the actual work content of it. Therefore, this study will inspect the in-house translator role base on actual work experience, project cases to analyze the job content and the challenges in-house translator faces nowadays. On top of that, base on own experience, this study will explore how in-house translators strategize their work to satisfy different objectives while successfully deliver the message; and to help more people understand the value of the in-house translator.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

49

Gomes, Miguel Ângelo Ferreira. „Internship report on the work performed at Airbus' Capital Expenditures Department with a special insight on the A380 Production Program and its Non-recurring Costs & Fixed Costs Reduction Program“. Master's thesis, 2014. http://hdl.handle.net/1822/30590.

Der volle Inhalt der Quelle

Annotation:

Relatório de estágio de mestrado em Economics
Airbus currently exhibits a dominant position in the manufacturing industry of passenger airliner aircrafts. The primary purpose of this report is to follow my internship at the firm’s Hamburg HQ, where I have served as the PMO for the A380 production program. Thus, the main goal of this report is to use the insight and non-confidential internal data collected throughout the internship in order to properly place Airbus in the manufacturers industry of all passenger aircrafts with a seating capacity over 100 passengers, with a particular emphasis in the market segment where the A380 aircraft currently operates. Focusing on the subjects dealt in the internship, the characterisation of the industry and the company is more than a mere contextualisation. Always taking into account the market duopoly in which is inserted, Airbus’ historical background and the market forecasts are not simply a means to an end, as their study becomes one of the goals of this report.

APA, Harvard, Vancouver, ISO und andere Zitierweisen

50

De, Villiers Lizelle. „Exploring perceptions and experiences of occupational stress stimuli present in a Gauteng based, small manufacturer“. Diss., 2014. http://hdl.handle.net/10500/18519.

Der volle Inhalt der Quelle

Annotation:

This case study explored the occupational stress stimuli perceived and / or experienced by employees in a small Gauteng based manufacturing Company. The research was aimed at assisting the Company‟s management to devise and implement strategies to prevent and/or reduce stress and its consequences. The key theoretical concept is that employees who are frequently exposed to stress stimuli within a work environment can incur stress. In turn, the consequences of stress (i.e. stress related illnesses) can be harmful to employees as well as to the organisations at which they work. The starting point for preventing the debilitating consequences of stress is to explore whether stress stimuli are prevailing within a workplace and also to discover the types of stress stimuli that may exist. Once this is known the Company‟s management team can implement stress reduction and prevention interventions to mitigate undesirable consequences of stress stimuli in the working environment. This research was done by means of a qualitative case study using one organisation and a number of sources of data. The Researcher made use of secondary data which were qualitatively analysed. As a result of the research the Researcher was able to discover a broad range of workplace stress stimuli in the workplace. This will assist the participating Company's management team to devise and implement plans/strategies to prevent and/or reduce stress and its consequences. This study also lays a foundation for future research to take place, specifically regarding the development and implementation of stress reduction and prevention measures within an occupational environment.
Business Management
M. Tech. (Business Administration)

APA, Harvard, Vancouver, ISO und andere Zitierweisen

Dissertationen zum Thema „Manufacture and works“

Geben Sie eine Quelle nach APA, MLA, Chicago, Harvard und anderen Zitierweisen an