Tesi sul tema "Improvement of mixing quality"
Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili
Vedi i top-50 saggi (tesi di laurea o di dottorato) per l'attività di ricerca sul tema "Improvement of mixing quality".
Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.
Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.
Vedi le tesi di molte aree scientifiche e compila una bibliografia corretta.
Larsson, Stefan. "Mixing Processes for Ground Improvement by Deep Mixing". Doctoral thesis, KTH, Civil and Architectural Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3667.
The thesis is dealing with mixing processes havingapplication to ground improvement by deep mixing. The mainobjectives of the thesis is to make a contribution to knowledgeof the basic mechanisms in mixing binding agents into soil andimprove the knowledge concerning factors that influence theuniformity of stabilised soil.
A great part of the work consists of a literature surveywith particular emphasis on literature on the processindustries. This review forms a basis for a profounddescription and discussion of the mixing process and factorsaffecting the process in connection with deep mixingmethods.
The thesis presents a method for a simple field test for thestudy of influential factors in the mixing process. A number offactors in the installation process of lime-cement columns havebeen studied in two field tests using statistical multifactorexperiment design. The effects of retrieval rate, number ofmixing blades, rotation speed, air pressure in the storagetank, and diameter of the binder outlet on the stabilisationeffect and the coefficient of variation determined byhand-operated penetrometer tests for excavated lime-cementcolumns, were studied.
The literature review, the description of the mixingprocess, and the results from the field tests provide a morebalanced picture of the mixing process and are expected to beuseful in connection to ground improvement projects and thedevelopment of mixing equipments.
The concept of sufficient mixture quality, i.e. theinteraction between the mixing process and the mechanicalsystem, is discussed in the last section. By means ofgeostatistical methods, the analysis considers thevolume-variability relationship with reference to strengthproperties. According to the analysis, the design values forstrength properties depends on the mechanical system, the scaleof scrutiny, the spatial correlation structure, and the conceptof safety, i.e. the concept of sufficient mixture quality isproblem specific.
Key words:Deep Mixing, Lime cement columns, Mixingmechanisms, Mixture quality, Field test, ANOVA, Variancereduction.
Yahiat, Feriel. "Analyse des mécanismes d’intensification du mélange et des transferts thermiques par combinaison de méthodes passives dans des écoulements internes tubulaires : application aux réacteurs chimiques continus et aux capteurs solaires". Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Lille Douai, 2023. http://www.theses.fr/2023MTLD0005.
The energy efficiency of thermal components and systems, as well as the improvement and development of new technologies, are major challenges today. In this general context, the work of this thesis is aimed at improving the thermal performance and mixing of multifunctional heat exchanger-reactors, which are more than ever key components. To achieve this goal, a passive intensification technique has been explored, involving the application of two types of macro-wall deformations on the walls of a laminar flow annular tube. The study initially focused on characterizing the secondary flows created by each of the deformations applied separately in order to enhance heat transfer.Subsequently, a combination of successive and alternating radial deformations on the outer wall, coupled with a geometry that induces swirl motion on the inner wall, significantly increased mixing by promoting chaotic advection within the flow. The understanding of the underlying physical mechanisms relied on numerical analysis of local thermal and hydraulic fields, identification of vortical structures, Poincaré sections, as well as the determination of thermo-hydraulic and mixing performance at both global and local levels. An experimental evaluation of hydraulic behavior was also conducted using the residence time distribution method, partially validating the chosen numerical model in this study. Finally, the last part of the study was dedicated to the application of the intensification concepts studied to the case of a concentrated solar thermal collector
Cipollini, Irene <1976>. "Pet food: quality and quality improvement". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/1058/1/Tesi_Cipollini_Irene.pdf.
Cipollini, Irene <1976>. "Pet food: quality and quality improvement". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amsdottorato.unibo.it/1058/.
Michael, Gary E. "Introduction to Quality Improvement". Digital Commons @ East Tennessee State University, 2011. https://dc.etsu.edu/etsu-works/6432.
Hernandez-Martinez, Francisco Gabriel. "Ground improvement of organic soils using wet deep soil mixing". Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614153.
Pang, Eva Y. "Developing a quality improvement taxonomy". Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03122009-040520/.
Sousa, SeÌrgio Dinis Teixeira de. "Quality improvement measures in SMEs". Thesis, University of Birmingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422289.
O’Donnell, Barbara Ann. "Quality improvement, or quality care : an ethnographic study of frontline National Health Service staff engagement with a quality improvement initiative". Thesis, University of the West of Scotland, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.768251.
Saroso, Dana Santoso. "Product quality improvement : a system approach /". St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17433.pdf.
Yella, Gilbert Ncheh, e Tongwa Ivo Atem. "Continuous Quality Improvement: Implementation and Sustainability". Thesis, Mälardalen University, Department of Innovation, Design and Product Development, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-378.
As the philosophy of doing business shift from sell what you can produce to produce what you can sell so do the customers’ specification continuously become a vital tool during product development process, hence increasing the volatility of the business environment. The objective of this thesis is to thoroughly review literature to be supported by cases why most companies fail in sustaining improvement programs then map out a pathway that will leads to successful implementation.
A series of reasons were found which impedes the successful implementation of improvement programs which includes; management is unable to define the problem to be solve and the method of measurement, implementers choose wrong parameters for improvement, implementers sub-optimize or may not involve everyone that will be affected by the program, top management gives little or no attention to improvement programs and at times they may even loose focus, so many concurrent improvement programs are executed which will result to resource overloading, teams members most often lack data integrity, and teams members are often scared to try new ideas hence prohibiting the chances of innovation. To minimize this cankerworm, a number of steps has been mentioned. The steps were divided into two phases, the selection phase and the implementation. The selection process includes; defining the program, focus program on improving shareholders’ value and choose program base on a holistic perspective. The implementation phase includes; commitment of top management, prioritize projects, use critical chain project management to plan and execute project, lay emphasis on quality data, minimize the number of concurrent projects, encourage risk taking, and spend time and resources on value adding activities.
Wang, Xiaosong. "Automatic quality improvement of archive film". Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556740.
Baliso, Unathi. "Partnering with suppliers for quality improvement". Thesis, Cape Peninsula University of Technology, 2010. http://hdl.handle.net/20.500.11838/1232.
Uneven surfaces on national roads that often lead to difficulty and even danger can be extremely hazardous when wet, due to mud and cracks, and also create dust pollution for motorists, pedestrians, residents and business. The continuing use of low quality raw materials in producing hot mix asphalt for national roads, leads to regular maintenance at a very high cost. The quality aggregates (stone that is used to produce asphalt), and the quality of bitumen are often inadequate for the correct composition of hot mix asphalt. The mst important factors affecting initial and long term performance of the highways is the inferior pavement structure and condition, due to poor aggregates (raw material)from suppliers. The performance of asphalt i s largely determined by the characteristics of its constituents, the asphalt binder and aggregates.
Steyn, Nadine Louise. "Quality improvement using visual management techniques". Thesis, Cape Peninsula University of Technology, 2015. http://hdl.handle.net/20.500.11838/2214.
The fundamental activities of a business can be summarized as being a cycle of strategy development and implementation, operations design and management and finally performance measurement, which feeds back into strategy design. This research aims to determine whether visual management can assist the quality motive by adding value to the above‐mentioned business activities for start‐up businesses and strategic business units within the South African context. The main topics to be addressed are performance management and visual management (VM). Performance management entails investigating the concept of strategy, its formulation and eventual implementation; performance measurement; improvement initiatives and greater quality theory. Visual management will be introduced as an angle on corporate communication and the importance of sharing information indiscriminately throughout the organisation. Both empirical and non-‐empirical research methods are used to answer the question of the impact of VM on business activities. The first involves a theoretical synthesis from the literature, the second was based on interviews with professionals from the relevant industries, the third is content analysis of the above.
Wrigley, Timothy John. "Water quality improvement of piggery effluent". Thesis, Wrigley, Timothy John (1999) Water quality improvement of piggery effluent. PhD thesis, Murdoch University, 1999. https://researchrepository.murdoch.edu.au/id/eprint/52406/.
J, Mohammad Mohammad Alkin Cihad. "Text Mining: A Burgeoning Quality Improvement Tool". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12609006/index.pdf.
Stefanovic, Milorad. "Advanced software engineering models for quality improvement". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60501.pdf.
Kromlidis, S. "Battery energy storage for power quality improvement". Thesis, University of Manchester, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556320.
Fahlén, Jesper, e Andréas Langell. "Internal Quality Audits as an Improvement Tool". Thesis, Linköpings universitet, Kvalitetsteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-107429.
En stor andel av företag runt om i världen är idag ISO 9001-certifierade och genomför således interna revisioner på regelbunden basis. Det har dock inte varit möjligt att bevisa att interna revisioner alltid adderar värde till organisationen, trots den stora användningen av detta verktyg. Vissa författare, till exempel Alic & Rusjan (2010) och Wealleans (2000), menar att det finns möjligheter att använda interna revisioner som ett värdeadderande förbättringsverktyg. Detta har lett till uppkomsten av detta examensarbete. Syftet med denna fallstudie var därför formulerat till att studera hur interna kvalitetsrevisioner kan göras mer effektiva samt användas som ett förbättringsverktyg. Forskarfrågor utformades för att uppfylla det angivna syftet. Målet med dessa forskarfrågor var att svara på hur och varför interna kvalitetsrevisioner utförs, identifiera vilka faktorer som är viktiga för effektiva revisioner samt undersöka hur interna kvalitetsrevisioner kan användas som ett förbättringsverktyg. Saab AB är ett försvars- och säkerhetsföretag med en lång historia av att utföra interna kvalitetsrevisioner. Nyckelpersoner från revisionsverksamheten på Saab har dock insett att revisionsaktiviteterna måste utvecklas, med målet att addera värde till företaget. Detta mål ligger i linje med syftet bakom detta examensarbete, vilket gör Saab till det ideala fallföretaget för denna studie. Från akademiska teorier har nio viktiga faktorer identifierats för att kunna förstå och förbättra interna revisioner. Den empiriska datan samlades in på fallföretaget genom intervjuer, en fokusgrupp, deltagande observation och dokumentgranskning. Resultatet från empirin var, tillsammans med de identifierade faktorerna, analyserade och diskuterade. Slutsatser kunde därefter dras. Fallstudien visar att en internrevision utförs enligt en process med fem steg, likt den teori som presenterades av Wealleans (2000). Revisioners huvudsyfte är för tillfället att kontrollera kravuppfyllnad. De tidigare nämnda nio faktorerna bekräftades vara viktiga för effektiva revisioner. Dessa faktorer måste beaktas för att interna kvalitetsrevisioner ska kunna användas som ett förbättringsverktyg. En av slutsatserna var att alla faktorer är indirekt eller direkt kopplade till varandra på ett komplext sätt. Det är därför viktigt att alla faktorer behandlas när ett företags interna revisionsaktiviteter undersöks. Resultatet indikerar att revisionsaktiviteter behöver breddas och att arbetsmetoderna och verktygen, som används i revisionsprocessen, behöver utvecklas. En rekommendation till fallföretaget är att de bör arbeta närmare sin Leanorganisation och börja använda kvalitetsverktyg såsom 5 Whys. Det finns ett behov av ytterliggare akademisk uppmärksamhet gällande området kompletterande kvalitetsverktyg och metoder till interna kvalitetsrevisioner. Denna fallstudie kan användas som en grund till för djupare och mer inriktad forskning inom detta område.
Kasikci, Ismail. "A new method for power quality improvement". Thesis, Brunel University, 2000. http://bura.brunel.ac.uk/handle/2438/5802.
Huddart, Sam. "Healthcare quality improvement in emergency laparotomy surgery". Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/848690/.
Heath, Michael Lindsey. "Quality control improvement in global apparel sourcing". Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104309.
Thesis: S.M. in Engineering Systems, Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016. In conjunction with the Leaders for Global Operations Program at MIT.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 49-50).
This project addressed challenges within the quality management process of one of the operating groups of Li & Fung. The primary goals were improved product quality and reduced quality control costs. The operating group works with thousands of factories across the world, producing a large variety of apparel and textile products. The industry trend of fast fashion, with small order sizes and shorter lead times, has placed considerable burden on the limited quality control resources. Understanding the current state of the quality management process was the first project step, and this was accomplished through factory visits and interviewing workers. The current inspection process was designed for large orders and performs sub-optimally with smaller orders. Second, the project took a broad view of the supplier base, performing statistical analysis of inspection and factory data. This revealed problems with the process that lead to high inspection costs and inaccurate inspection results. Next, the project identified technological solutions and process improvements to address the root causes of these issues and to increase the accuracy and efficiency of inspectors. Three specific technology solutions were developed: measurement digitization, label scanners, and improved management metrics. Each solution was prototyped and the critical functionality was tested to demonstrate the value of implementation. Business analysis of the solutions revealed time savings of 60,000 inspector hours/year and cost savings of more than $1 million. At the conclusion of the project, integration of the solutions within the current inspection mobile app was ongoing and expected to be rolled out across the quality organization in the first half of 2016. Finally, recommendations beyond the scope of the technology solutions are provided for further improvement of the quality management process.
by Michael Lindsey Heath.
M.B.A.
S.M. in Engineering Systems
Brown, Robert Paul. "Organisational culture and quality improvement : a study". Thesis, University of Plymouth, 1997. http://hdl.handle.net/10026.1/2682.
Neubeck, Truls. "Quality improvement within nonprofit social service providers". Doctoral thesis, Hälsohögskolan, Högskolan i Jönköping, HHJ. IMPROVE (Improvement, innovation, and leadership in health and welfare), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-29788.
Watson, Robert V. "Mains power quality improvement using active filters". Thesis, University of South Wales, 2009. https://pure.southwales.ac.uk/en/studentthesis/mains-power-quality-improvement-using-active-filters(e798030f-aca0-49c1-b85f-c9cb856109bb).html.
Michael, Gary E. "Running a Successful Clinical Quality Improvement Process". Digital Commons @ East Tennessee State University, 2012. https://dc.etsu.edu/etsu-works/6433.
Johnson, Jeannie E. "Quality Improvement Project: Decreasing Patient Wait Times". Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent1627511374637774.
Kwok, Tak Lung. "Quality improvement and inspection in supply chains /". View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?IEEM%202004%20KWOK.
Bon, Abdul Talib. "Process quality improvement on beltline moulding manufacturing". La Rochelle, 2008. http://www.theses.fr/2008LAROS239.
The world of manufacturing industries is forced to meet the demand of the end users and one of the factors is highly quality demand from customer and highly precise products have determined by manufacturing systems. Many strategues from manufacturer already did how to reduce the number of defected and forecast the manufacturing process to more accurate. Process Quality Improvement approach was introduced and implemented in this study. Which is a parameter setting and optimization for beltline moulding process have developed and optimized to both shorten setting time and reduce number of detect procedures. We developed new techniques in parameter selection and optimization which is we apply a statistical techniques, Particle Swarm Optimization (PSO) and Genetic Algorithm (GA) approach in this study. The ARIMA forecasting techniques developed for this study can forecast, and can become superior to traditional methodology where interpretation is needed. The findings from the study will serve as a useful evidence and applicability of the proposed methodology to beltline moulding manufacturer for implementation
Ayad, Sarah. "Business Process Models Quality : evaluation and improvement". Thesis, Paris, CNAM, 2013. http://www.theses.fr/2013CNAM0922/document.
In recent years the problems related to modeling and improving business processes have been of growing interest. Indeed, companies are realizing the undeniable impact of a better understanding and management of business processes (BP) on the effectiveness, consistency, and transparency of their business operations. BP modeling aims at a better understanding of processes, allowing deciders to achieve strategic goals of the company. However, inexperienced systems analysts often lack domain knowledge leading and this affects the quality of models they produce.Our approach targets the problem related to business process modeling quality by proposing an approach encompassing methods and tools for business process (BP) models quality measurement and improvement. We propose to support this modeling effort with an approach that uses domain knowledge to improve the semantic quality of BP models.The main contribution of this thesis is fourfold:1. Exploiting the IS domain knowledge: A business process metamodel is identified.Semantics are added to the metamodel by the mean of OCL constraints.2. Exploiting the application domain knowledge. It relies on domain ontologies. Alignment between the concepts of both metamodels is defined and illustrated.3. Designing of the guided quality process encompassing methods and techniques to evaluate and improve the business process models. Our process propose many quality constraints and metrics in order to evaluat the quality of the models and finally the process propose relevant recommendations for improvement.4. Development of a software prototype “BPM-Quality”. Our prototype implements all theabove mentioned artifacts and proposes a workflow enabling its users to evaluate andimprove CMs efficiently and effectively.We conducted a survey to validate the selection of the quality constraints through a first experience and also conducted a second experiment to evaluate the efficacy and efficiency of our overall approach and proposed improvements
Ayad, Sarah. "Business Process Models Quality : evaluation and improvement". Electronic Thesis or Diss., Paris, CNAM, 2013. http://www.theses.fr/2013CNAM0922.
In recent years the problems related to modeling and improving business processes have been of growing interest. Indeed, companies are realizing the undeniable impact of a better understanding and management of business processes (BP) on the effectiveness, consistency, and transparency of their business operations. BP modeling aims at a better understanding of processes, allowing deciders to achieve strategic goals of the company. However, inexperienced systems analysts often lack domain knowledge leading and this affects the quality of models they produce.Our approach targets the problem related to business process modeling quality by proposing an approach encompassing methods and tools for business process (BP) models quality measurement and improvement. We propose to support this modeling effort with an approach that uses domain knowledge to improve the semantic quality of BP models.The main contribution of this thesis is fourfold:1. Exploiting the IS domain knowledge: A business process metamodel is identified.Semantics are added to the metamodel by the mean of OCL constraints.2. Exploiting the application domain knowledge. It relies on domain ontologies. Alignment between the concepts of both metamodels is defined and illustrated.3. Designing of the guided quality process encompassing methods and techniques to evaluate and improve the business process models. Our process propose many quality constraints and metrics in order to evaluat the quality of the models and finally the process propose relevant recommendations for improvement.4. Development of a software prototype “BPM-Quality”. Our prototype implements all theabove mentioned artifacts and proposes a workflow enabling its users to evaluate andimprove CMs efficiently and effectively.We conducted a survey to validate the selection of the quality constraints through a first experience and also conducted a second experiment to evaluate the efficacy and efficiency of our overall approach and proposed improvements
Ferreira, Labiche. "Crash quality- an approach for evaluating spending on quality improvement initiatives". Doctoral diss., University of Central Florida, 2000. http://digital.library.ucf.edu/cdm/ref/collection/RTD/id/26041.
The quality movement has become popular among corporations big and small for one reason: empirical evidence suggests that quality and productivity (and hence profitability) are linked. Unfortunately, while many firms accept that quality and productivity go together, few actually track the gains associated with their quality improvement programs. Companies also tend to spend on quality improvement with no indication of estimation of the impact of funding on the targeted process. It would be of great value to know: (1) the impact of spending to enhance the product/process quality level, and (2) the point at which expenditures for quality improvement are not economical. This research involves modeling the quality level of a product composed of integrated components/processes and the costs associated with quality improvement. Presented in this research is a methodology for determining the point at which the target quality level is reached. This point signifies when future spending should be re-directed. The research defines this point as the "Crash Quality Point (CQP)." Cases of a single process level and double level three-stage process are modeled to conceptualize CQP. The finding from the output analysis reveal that the quality level appoaches the target level at varying points in time. Any spending beyond this point does not have an impact on the quality level compared to the period prior to the Crash Quality Point. Spending past this point is futile and these funds could be spent on othe quality improvement projects. The special case modeled also illustrates the use of this tool in the selection of processes for improvements based on the quality level of the process. This is an added advantage in scenarios where funds are limited and management is constrained to improve process quality with limited funds. Using a real world example validates the proposed CQP methodology. The results of the validation indicate that the model developed can assist managers in forecasting the budget requirements for quality spending based on the quality improvement goals. The tool also enables managers to estimate the point in time at which allocations of funds may be directed for process reengineering. The CQP method will enable quality improvement professionals to determine the economical viability and the limits in expenditures on quality improvement. It enables managers to evaluate spending alternatives and approximate when the point of diminishing return is reached.
Ph.D.;
Engineering;
Industrial Engineering Management Systems;
154 p.
xiii, 154 leaves, bound : ill., (some col.) ; 28 cm.
He, Zhonglin. "Software quality improvement by application of the Japanese manufacturing quality techniques". Thesis, Southampton Solent University, 1998. http://ssudl.solent.ac.uk/1273/.
Wajid, Gohar. "Pakistan's teaching hospitals : present measured quality and proposed quality improvement programme". Thesis, University of Warwick, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402995.
Huber, Anita. "Internal mixing in a mine lake /". Connect to this title, 2006. http://theses.library.uwa.edu.au/adt-WU2007.0103.
Dyason, Marilyn Dorothy. "Driving competitive continuous improvement". Thesis, University of Portsmouth, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310396.
Wu, Jun-Mou, e 吳俊謀. "Study on Mixing Ratio of Debris In-Situ Mixing Ground Improvement Method". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/02483804701423006558.
國立中興大學
土木工程學系所
102
In this study, severe different sites in Taiwan are chosen, for the cross reference of previous studies. Different mix type and mix proportion by the weight ratio of the material to explore the impact on the strength of ratio of the cement content, and by Jiji weir''s deposition debris, to investigate the better mix proportion of sand content and water-cement ratio. The test results show that the cement content is the main factor, as the cement content ratio increases, the compressive strength also increases. The compressive strength of the sand is affected by the water-cement ratio, in one-way ANOVA analysis. Effects of sand content to a lesser extent. The major concern for achieving high strength, the water-cement ratio should be increased. Debris in Jiji Weir in-situ, for example, the amount of the sand in debris is 40-50%, the cement content used is 7.7% (weight ratio 1:12) and added water of the amount of mix proportion, water-cement ratio of 1 to 1.5, and 28-day age compressive strength achieved of 70 kgf/cm2, is judged as a proper mix proportion. In this study, the strength of demand for different projects are classified as type I (base), type II (ground improvement). Type I (basic) design strength of 70 kgf/cm2, the minimum specimen unit weight should be higher then 2.15 t/m3; Type II (ground improvement) design strength of 30 kgf/cm2, the minimum specimen unit weight should be 2.07 t/m3.
Hou, Kan-Chun, e 侯甘峻. "Preparation of improvement mixing in biodiesel using ultrasound". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/75713424730030999627.
高苑科技大學
化工與生化工程研究所
98
In this study, soybean oil and methanol as raw materials, sodium hydroxide as catalyst, the use of high power ultrasound to improve the mixing speed up the mixture of soybean oil and methanol, to accelerate the preparation of the conversion rate of biodiesel. The results showed that ultrasound power range of 55 to 275 W, the conversion rate first increases and then decreases; raising the oil/methanol can enhance the conversion ratio; sodium hydroxide addition range of 0.1 to 3.0 wt% , adding sodium hydroxide amount of 0.5 wt% in the highest, not been addition of conversion rate than higher ; change in different temperature range of 20 to 70 oC, the reaction temperature exceeds 60 oC, the conversion rate would decrease; at different reaction time range of 0.1 to 3.0 hrs, the highest conversion rate in 1.0 hrs.In addition, the improvement of stirring rate range of 100 to 600 rpm , the stirring has no too greatly change, the conversion rate has remained above 90 %. The study found that use of ultrasound to accelerate soybean oil and methanol production biodiesel optimization conditions are: the intensity of ultrasonic of 165 W, the ratio of 1︰6 oil/methanol, the amount of sodium hydroxide of 0.5 wt%, reaction temperature 60 oC, the reaction time of 1.0 hr and stirring rate of 200 rpm, the conversion rate was 97.5 %.
Chen, Rong-Lih, e 陳榮利. "MECHANICAL PROPERTIES OF SOFT GROUND WITH MIXING IMPROVEMENT". Thesis, 1994. http://ndltd.ncl.edu.tw/handle/22344304259654116908.
Portillo, Patricia Maribel. "Quality by design for continuous powder mixing". 2008. http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17375.
Yang, Chun-Po, e 楊竣博. "Study of Mechanical Behavior on Ground Improvement withDeep Mixing Pile". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/26793641328504905203.
國立中興大學
土木工程學系所
102
Long time is required for clay layers under load compared with other soils. Deep mixing pile is a comparatively economic and fast method of ground improvement in order to speed the consolidation rate of clay. However, there seems some shortage of deep mixing pile with complicated geology in the theoretical and designed aspects. Recently, the numerical analytical method is used as the references of design with the availability of computer applied program. This study is aimed at the settlement, relevant mechanical behavior and the effect of influencing factors of soft clay without and with deep mixing pile as engineering projects using Plaxis 2D program. From the analyzed results, it indicates that (1). Deep mixing pile has the effect of speeding consolidation rate and reducing the differential settlement. (2).The final settlement is reduced and consolidation rate is speeded with the increase in the area of ground improvement. (3).The final settlement of pile can be effectively reduced, consolidation rate is speeded and differential settlement is decrease with higher modulus of pile. (4).The consolidation rate can be speeded with the increase of pile drainage. But there is no effect in the final settlement.
ChihChou, wei, e 周洧志. "Mixing Efficiency Improvement of T-channel Micromixers with Crossbar Structures". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2rhsbh.
國立成功大學
航空太空工程學系
105
Mixing Efficiency Improvement of T-channel Micromixers with Crossbar Structures Author: wei- Chih Chou Advisor: Dar-Tzi Pan Department of Aeronautics and Astronautics, National Cheng Kung University SUMMARY Numerical simulations are performed to study the mixing efficiency of T-channel micromixers with crossbar structures immersed in the main channel . A commercial CFD software and Taguchi Method are used to set up numerical experiments to search for the crossbar geometric parameters corresponding to high mixing efficiency. Keywords: CFD; Micromixer; T-channel INTRODUCTION There are two kinds of micromixers: Active micromixers: External sources of energy of various kind are introduced and actively controlled to enhance mixing. Passive micromixers: No movable or controllable component is implemented. Mixing can be enhanced only by inducing vortical flows using geometric variations of the flow passage. This thesis works on the improvement of passive T-channel with crossbar structures placed in the main channel to enhance mixing. A commercial software developed by CFDRC is used as the tool to compute the mixing phenomena of two fluids in the main channel of micromixers. The orthogonal tables of Taguchi method are employed to find the geometric settings of the crossbar structures for high mixing efficiency. The geometric dimensions of the crossbars and the main channel are less than 1mm. IMPORTANT PARAMETERS Reynolds Number: The Reynolds number is defined as Re=(ρV_ref L_ref)/μ, where ρ is the density of the fluid(kg/m^3), V_ref is the characteristic velocity of the fluid flow (m/s), L_ref is a characteristic linear dimension(m), μ is the dynamic viscosity of the fluid( kg / m • s). Reynolds number is generally used to identify whether the flow studied is laminar or turbulent. In this thesis, the Reynolds number is so low that the flow is laminar. Schmidt Number: Schmidt number (Sc) is a dimensionless number defined as Sc=μ/ρD, where μ is the dynamic viscosity of the fluid( kg / m • s), ρ is the density of the fluid(kg/m^3), D is the mass diffusivity (m^2/ s). It is an indicator of the effectiveness of mass diffusion as compared with momentum diffusion. BASIC ASSUMPTIONS The two fluids undergoing mixing are the same fluid with different mole concentrations. During and after mixing the fluid properties remain unchanged, but concentration changes. The following conditions are assumed: (1)The fluid is Newtonian fluid. (2)The flow is incompressible and laminar. (3)The fluid density , viscosity and diffusivity are constant. (4)No chemical reaction occur during mixing. (5)The body forces can be neglected. TAGUCHI METHOD The Taguchi method is a statistical method developed by Genichi Taguchi. It has been widely used in factories to improve the quality of manufactured goods. The orthogonal table of Taguchi method is usually applied to minimize the number of experiments required to collect adequate statistical information about the manufacturing process in order to ensure the quality control of the product. It is termed as L_a (b^c), where “a” is the number of experimental runs, “b” is the number of possible settings of control factors, and “c” is the number of control factors of the processes. In this thesis, Taguchi method is used to setup the numerical experiments for finding the crossbar parameters corresponding to high mixing efficiency. BASIC SMOOTH-WALL T-CHANNEL MICROMIXER The height H of the square sectional plane of the main channel is used as the reference length in this study. It is 1 mm. The mean velocity U_mean at the branch entrance of the mixer is used as the reference velocity. The Reynolds number studied here ranges from Re=0.1 to Re=10, which is well within the laminar flow range. For smooth-wall micromixer, the mixing occurring in the main channel relies mainly on the molecular diffusion in the direction perpendicular to the main stream. A mixing index σ can be defined for the concentration distribution on the cross sectional plane of the main channel. While σ =0 indicates no mixing occurs on the plane, σ=100% means a complete mixing. Here we take σ=99% or 98% as an indication of well mixing. The length of channel required for the occurrence of σ=99% is termed as L_(99%). For smooth wall micromixers with water as the working fluid, L_(99%)=28.5mm. We shall introduce structural variations in the main channel to enhance mixing, or equivalently, to reduce L_(99%). MIXING ENHANCEMENT BY CROSSBAR STRUCTURES Two rows of crossbar are placed in the main channel to enhance mixing. The control factors adapted in this study are: The gap distance G between the upper and the lower crossbars. The separation S between two consecutive crossbar structures. The horizontal offset of the crossbars. The oblique angle T of the crossbar relative to the main stream direction. The height of crossbar, H. The upper row and the lower row of crossbars can be placed in parallel to each other or in staggered Ⅹ-formation. The combination of control factors derived from this study using water as the working fluid at Re=0.1 reduces the channel length required for a 99% mixing from 28.5mm for smooth-wall T-channel micromixer to only 9.76mm. CONCLUSION Numerical results have shown that the staggered Ⅹ-formation is less effective to enhance mixing. Instead, the parallel crossbar formation with proper geometric parameters can effectively reduce L_(98%) with working fluid of water, alcohol and hydrogen gas at Reynolds number less than 10.
Jalbani, Akhtar Ali. "Quality Assessment and Quality Improvement for UML Models". Doctoral thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B6AA-7.
Mishra, Shrutisnata. "Power Quality Improvement Using Unified Power Quality Conditioner". Thesis, 2016. http://ethesis.nitrkl.ac.in/8277/1/2016_MT_214EE4248_Power_Quality_Improvement_Using.pdf.
鄭松森. "Quality Improvement of Sapphire Wafer". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/76043778767156715129.
國立清華大學
工業工程與工程管理學系工程碩士在職專班
97
Due to bursting development of LED market, highly change and various of requirements, and competition among all sapphire supplier, quality of sapphire and wafer-customization have become fundamental conditions of raising customer satisfaction. Productivity and competitiveness of an enterprise is determined by quality, cost, delivery time of product. During the period of quality improvement, the company may encounter technical problems or bottleneck from manufacturing and product design which all are important factors of causing yield loss. This research took company A as an example. According to cause-effect analysis, the reasons of causing wafer broken and wafer scratch during grind process were operating method of people, attitude management toward job, job transfer between duty-shift and pressure control of equipments. The research not only discussed the root causes of cause-effect generating from people, but also prevents from miscommunication, and job transfer anomaly. To assess one’s proficiency was also one of the management methods mentioned. Through effective human management, job improvement, facility plan and quality control methodology, improvements of decreasing man-made error, and process quality were available, the high yield and low cost can also be acquired. The research predicted that wafer broken and scratch can be decreased through improving factors above. After automatize equipments, one can decreased wafer broken rate, parameters, such as time and pressure, setting error that resulted in wafer thickness out of spec and wafer loss. Through the discussion of results, we could put forward the contribution, limitation and future development.
Garudachar, Srinivas B. "Statistical techniques for quality improvement". 1989. http://hdl.handle.net/2097/23906.
Yu, Wei-Chang, e 俞維昌. "The Quality Improvement Organization Model". Thesis, 1994. http://ndltd.ncl.edu.tw/handle/17855990245669985905.
國立中山大學
企業管理研究所
82
The qualities of products and service are more and more import- ant for organization’s competiveness since 1980s.According to U.S.Defence study(1990),organization has been already developed from maximizing the performance of each part to maximizing the performance of system.For an organization to be the best in its industry,the entire organization including supplier and customer has to be addressed as a unit and has its continuous quality improvement on a global scale.Therefore,this research investigat- es organization change by extracting concepts of system and qual- ity improvement.Research methods include literature review,perso- nal interviewing and case archival analysis. The new findings of this research include: 1.The QIO model which based on mutual influence by customer sati- sfaction level and organizational activity,can be separated into four types:adaptive、efficient、technical and innovation. Innovation type is different from current TQM by process team、 self-directive management and learning.QIO model and its twelve question can do as a tool for self-diagnosis of organization. 2.The stages for entering and sustaining innovation type are:(1) Top management restructures organizations to process- drive and self-directed(2)Total job skill and attitude training(3)Build prcoss teams to upgrade technology、job quality or labor produ- ctivity for customer delight(4) Shareowners support top managem- ent and reinvest employee by the reason of good profitability and market share which comes from delighted customer. 3.The learning cycle which is formrd by self-apprasial、question、theory and test is better than PDCA or OPMR for organization which strives to sustain the best in the world. 4.The potential competiveness of organization is organization’s assets times by organization’s context.
Chu, Jia-Hui, e 朱家慧. "Improvement of Low Quality Image". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/77738125267770762316.
國立臺灣海洋大學
資訊工程學系
100
Currently, many devices are available to capture images. The image color is usually distorted if a low cost device is adapted. This thesis explores an approach of improving the low-quality digital images such as cell phone cameras through correction of distorted color images. This thesis proposes a color correction algorithm for the low-quality digital images. The proposed method uses the expectation maximization algorithm (EM algorithm) to obtain the parameters, which assign input images into many defects classes. There are three processing steps for the proposed method. First, global color attributes of the low quality input image are used in a Gaussian mixture model (GMM) framework to classify the input images into M predefined global classes. In the second step, the input image is processed with a non-linear color correction algorithm for each of the M global classes. This color correction algorithm, referred to as RSCC (resolution synthesis color correction), applies a spatially varying color correction, which is determined by the local color attributes of the input image. Last, the outputs of the RSCC predictors are combined using the global classification weights to generate the corrected color image.
Wang, Sheng-You, e 王聖佑. "Efficiency improvement on Quality Inspection". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9bac65.
國立勤益科技大學
資訊管理系
105
At present Taiwan's traditional manufacturing industries, most of the manufacturers use the ISO standard to improve the quality and efficiency of the productions. The primary activities to make the process function effectively are quality standardization of in-process inspection, including first and last check, independent inspection, inspection examination, etc.,. But they will build very large numbers of report files during operations that make the jobs very tedious and inconvenient. This study uses feasibility-analysis to illustrate the executable conditions and uses SWOT method to analyze and cross-analyze to give strategy of quality control inspection system. listing quality inspection planning program. The main objective of this article is to simplify the inspections and to digitalize the table sheets, such that, the original complicated paper reports, through database analysis, process exception reports will be given and used for improvement scheme. The inspections are made stage by stage to confirm whether each of them fulfills the predicted planning, which keeps good efficiency of all the inspections.
Chang, Yang Chin, e 張仰欽. "Improvement the Manufacturing Mixing of Airbag Inflator Using Eight Disciplines Approach". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/64065035858230190701.
長庚大學
管理學院碩士學位學程在職專班經營管理組
101
As consumer’s awareness has arisen, vehicles’ functions have transcended from simply providing for transportation to comfort and speed; therefore, the vehicles’ safety device has become more and more important to the consumers. In normal driving condition seat belt can provide enough protection for the driver. But when crash accident happens, it takes a good safety device, i.e. airbag system, to prevent or minimize the impact between the driver/passengers and the vehicle itself and then to save lives. The drivers in Taiwan have gradually become aware of the importance of having airbag system in their vehicles. However, they usually sacrifice the necessity of adding airbags due to the limited choice of vehicle types with limited budget and put themselves in higher risk due to the lack of proper safety device in the vehicle they purchase. The effectiveness of airbag protection system has long been validated and commonly accepted by people who own it; therefore, a good and reliable airbag system is crucial. The customer complaint elaborated in this study is a rare case being filed by a customer of a Japanese automobile made in their North American facility. It appears that this customer complaint might have come from the car user directly. The modern airbag system consists of many components among which the inflator is the most important one. For the defendant company in this case, if the inflator is proved to have exposed potential risk to the car user, it can be very dangerous. In order to restore customer’s confidence and trust in the fastest manner, this study reveals how the defendant company could implement the Ford Eight Disciplines (8D) corrective action review and related quality management tools to improve or prevent reoccurrence of such customer complaint in the most efficient and effective way, so that eventually the customer doesn’t need to choose to recall all the vehicles and to replace all the affected components at an extremely high price.