Tesi: "Material production"

1

Olle, Chase R. "Pyrolytic graphite production : automation of material placement". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/93847.

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Thesis: M. Eng. in Manufacturing, Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 78-79).
This research examines the process and challenges associated with the addition of an autonomous transfer robot to a manufacturing line for AvCarb Material Solutions for use in production of pyrolytic graphite. Development of the system included the design and fabrication of an end-effector, selection of a SCA RA robotic arm, and incorporation of a vision system. The arm and the end-effector were tested to see if material would shift during transfer. The entire system was tested for repeatability and transfer time. The results of the test indicted that the transfer system would successfully meet specifications with high process capability given by a Cpk of 1.47.
by Chase Olle.
M. Eng. in Manufacturing

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2

Stridh, Madeleine. "Material flow : An analysis of a production area for improved material flow". Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80193.

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Focus in the world today is quality and customer orientation. An organization needs to understand the concept of value from the perspective of a customer in order to keep up with expectations on quality, and the turbulent and global environment of today characterized by rapidly changing conditions. This master thesis project was conducted at ABB in Sweden during spring 2020. It is essential for ABB to have an ongoing focus on improvement to maintain a successful organization and enable a competitive future of quality and innovation. The aim of this project was to identify ways to improve material flow and reduce the amount of non-value-added activities that exist in a particular assembly process today. The objective of the project was to conduct proposals on realistic actions for improvement for implementation. Initially in the project a current state was performed and compiled into a specification of requirements and visualized through overall mapping of the material and communication flow. Two of the requirements were reducing the total lead time and ensure the same, or improved, physical and psychosocial work environment. The result of the current state showed that material is not available when needed, material shelves are not structured, and material flow is not optimal. Analysis methods used for analyzing the current state were material flow charts, value stream mapping and spaghetti diagrams. The outcome of the performed analyzes were then used as the foundation for a compiled list of problem areas. All previous performed work was then summarized, discussed and developed into a list of actions for improvement. This phase was performed by initially generating a great amount of ideas, which were then reviewed and evaluated in consideration of the specification of requirements. In addition to the final list of actions, a mapping of the future state was conducted to support the actions and visualize what a future state could look like if the actions are implemented. Lastly, the final list of actions was complemented with another list – a living document of the actions. This document gives the opportunity on a regular basis to monitor progress and should be regularly reviewed and updated. To ensure a successful implementation of improvement work based on the conducted action list, it is recommended to define and clarify responsibility for each action as well as target date and end date. Furthermore, the list should be continuously modified to ensure implementation. It is as well recommended to acknowledge implemented improvements in parallel with performing actions to maintain motivation. Additionally, participation in implementation and promoting dialogue, transparency and respect are valuable factors reducing the negative effects of the implementation of improvement concepts and contributes to a sustainable development of the improvement work.

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3

Yi, He. "Agent-based Material Planning for Evolvable Production System". Thesis, KTH, Industriell produktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103016.

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The two main characteristics of current market are dynamicity and unpredictability which can’t be satisfied by the traditional manufacturing system through pre-set parameters. Traditional production system is facing the challenge that evolves to a new generation manufacturing system which manufactures products in flexible volume with rapid product definition and system configuration. The advent of Evolvable Production System offers promising approach to adapt to the increasing customer consciousness and product differentiation. EPS improves system re-configurability by process-oriented modularity and multi-agent based distributed control system. Hakan Akillioglu (2011) proposed a demand responsive planning framework to enlighten the relation between planning system structure and the manufacturing system characteristics. The proposed planning is still at the preliminary phase, it contains the coherent flow of planning activities and aims to achieve complementary model of production system and planning framework. This thesis is based on Hakan’s planning framework and focus on the development of the domain between material inventory and the material on the shop floor. The critical prerequisite of the proposed model is that material required to be delivered in the right type material, right amount and at the right location and right time under the dynamic environment of EPS.

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4

Fung, Koon-yau, e 馮冠游. "A study of material planning in cigarette production". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1990. http://hub.hku.hk/bib/B31264633.

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5

Underwood, Sarah Anne. "The production of human material for skin replacement". Thesis, University College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325362.

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6

McCaskey, Donald Wayne. "Effective dispatching in the material requirements planning job shop /". Connect to resource, 1987. http://rave.ohiolink.edu/etdc/view.cgi?acc%5Fnum=osu1264613608.

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7

Gustafsson, Jesper, e Mikael Landberg. "Production of bio-plastic materials from apple pomace : A new application for the waste material". Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-21216.

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Extensive quantities of apple pomace are generated annually but disposal of this waste is still much disputed. In EU alone, 500 000 tons are produced every year. Without further treatment, the acidic character of apples with their high sugar and low protein content makes the pomace unsuitable for landfilling and animal feedstock. However, further treatment is usually not economically feasible. This study addresses this issue by introducing a new approach for the apple pomace to produce sustainable materials. The high content of sugars in apple pomace which can be reshaped and reformed at higher temperatures makes the waste material suitable for plastic production. Other components found in apple pomace are 5 % proteins and 1.5 % fats. Fibers are abundant, dietary fibers amounts for more than half (55 %) the original apple pomace weight. Phenols, sorbitol and acids can be found in minor mount, 2 % or less. The apple pomace itself is a mixture of mostly pulp and peel which corresponds to 9/10 of the total mass. Whereas seeds, seed core and stalk are the remaining 1/10. The possibilities of utilizing apple pomace to produce biofilms and 3D shapes have been investigated. The effects of introducing orange pomace, another waste material produced in extensive quantities, to apple pomace samples has also been studied. Two methods were used to produce bioplastic materials; solution casting and compression molding. Glycerol was used as a plasticizer. Apple pomace, either washed or not washed, was oven-dried and milled into a fine powder. Using compression molding, plates or cups of the two powders with different amounts of glycerol were prepared. Mixtures of apple pomace and orange pomace, with or without glycerol, were prepared in the same way. The apple pomace was also used in a film casting method to produce plastic films. Applying laser cutting to the plates and plastic films, dog-bone specimens were created whose mechanical properties were analysed using a universal testing machine. Highest values in terms of tensile strength and elongation at max was reached with bioplastics produced from solution casting where the values varied in the range 3.3 – 16 MPa and 11 – 55 % respectively. The compression molding approach resulted in tensile strength values in the range 0.94 – 5.9 MPa whereas the elongation at max was in the range 0.30 – 1.9 %. A possible application for this material could be disposable tableware which does not require high mechanical strength. It was shown that it is possible to produce 3D structures and plastic films from apple pomace. Washed apple pomace with glycerol has similar properties as not washed apple pomace without the plasticizer. Adding orange pomace to apple pomace samples increases the tensile strength at the expense of the elongation at max. The pressing conditions and powder size greatly effects the mechanical properties, where a larger powder size lower the values for the mechanical properties. This new approach paves the way for a new utilization of apple pomace to replace some petroleum-based materials and at the same time solve the disposal problem of apple pomace.

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8

Zhao, Ying. "Optimization of cooperative material handling systems". Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37837710.

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9

Albers, Jason. "Bill of material testing for enterprise resource planning (ERP) implementation". Menomonie, WI : University of Wisconsin--Stout, 2004. http://www.uwstout.edu/lib/thesis/2004/2004albersj.pdf.

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10

Gustafsson, Daniel, e Mikael Johansson. "A Material Flow Evaluation at Scania Production Slupsk S.P.S". Thesis, Linköping University, Department of Management and Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10133.

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This master’s thesis is performed at Department of Management and Engineering Linköping University, for Scania Omni at Scania Production Slupsk (S.P.S). Omni is responsible for development, manufacturing and marketing of city, suburban and intercity buses. After acquisition of the production unit in Slupsk in 2002 lower production cost per bus is possible. But without control over the organisation costs are rising due to late delivery fees and high stock levels. At the outset, the thesis included three clearly defined objectives:

- Map the present situation at Scania Production Slupsk regarding material flow from supplier to assembly line including a part and storage analysis.

- Benchmark the current routines at Scania Production Slupsk with other successful companies. Furthermore, conduct literature research in order to find theories and philosophies that support problem analysis and thesis solution.

- Develop standard routines for material control methods (MCM) and material supply methods (MSM).

A complimentary objective is to work as a catalyst during the time of the thesis.

The mapping of the present situation showed that MCM and MSM are very tight connected to each other. It was questioned whether this structure was the best way to manage the material flow. After a parts and storage analysis, material was divided into different segments depending of price, consumption and movement.

The benchmarking studies showed different ways to manage the material flow. Implementation of unit load, kanban and clear defined interface between departments showed potential to improve the material handling and increase effectiveness.

New routines and part segment definitions described in a logistics manual (Appendix I) were made align with a comparison between previous and recommended definitions.

The result showed that some parts needs to be controlled differently. Primary recommendations are that logistics manual shall be used when new parts are introduced into the Scala system. Responsible personnel are suppose to give suggestion concerning decision making of MCM and MSM and with help of the logistics manual the work can be more efficient, resulting in a material flow that is flexible and have potential for improvements.

Secondary, to avoid material handling to some extent implementation of two-bin system is recommended. Additional recommendations regarding two-bin system is to handle material according to unit load, which enable FIFO, traceability and higher turn over rate

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11

Sandberg, Dick. "Value Activation with vertical annual rings - material, production, products". Doctoral thesis, Linnéuniversitetet, Institutionen för teknik, TEK, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-19082.

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12

Lin, David. "The production of a standard material for liberation analysis /". Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60572.

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In mineral processing, the liberation distribution of the mineral phases in an ore is an important factor. Unfortunately, liberation distribution is very difficult to measure accurately. One problem is the stereological effect associated with a microscopic liberation analysis.
Many methods have been proposed to correct for the stereological effect, but they remain essentially untested, in part due to the lack of a standard or reference material. In this work, a method was established to create an artificial standard material.
Silica grains were placed in an epoxy resin to create a block of material that was crushed to yield liberated and locked particles. The composition, and thus liberation, of these particles was determined with a series of heavy liquid separations.
By changing the grain size to particle size ratio, the type and amount of locking was affected. The best compromise between the amount of locked material produced and the production of simple locked particles (which pose the greatest stereological challenge) was found; it occurred at the point where the grain and particle sizes were the same.
Liberation analyses were performed on this material and compared with a model prediction based on the sectioning of spheres with single planar interfaces. There were some discrepancies between the analysis and model results.

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13

Rosario, Vivek M. "Production of a thermal barrier material by combustion synthesis". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0004/MQ39698.pdf.

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14

Sandberg, Dick U. W. "Value activation with vertical annual rings : material, production, products /". Stockholm, 1998. http://www.lib.kth.se/abs98/sand1215.pdf.

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15

Stern, Warren Michael. "Nuclear weapons material control : verification of tritium production limitations". Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14472.

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16

Ma, Ping. "Experimental studies on treatment and recycling of pickling sludge generated in stainless steel production". Licentiate thesis, Luleå tekniska universitet, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18242.

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Pickling sludge generated in the stainless steel industries contains large amounts of calcium fluoride and water and relatively small amounts of metals. Therefore, such sludge is difficult to be directly recycled back to the EAF process and would be harmful to the environment if deposited as landfill for a long term. The main objective of the present thesis work is to find out proper ways to treat the pickling sludge and to recover useful metals from it. For this, characterisations, solid-state reduction and smelting reduction tests on the pickling sludge were carried out in the laboratory. Likewise, comparison studies on solid-state reduction of pure metal oxides with graphite and on pickling sludge with p-coke were conducted using TGA. In addition, the off-gas generated by smelting reduction of pickling sludge was monitored by measurements with a mass spectrometer. Through the present thesis study it can be concluded that it is possible to treat and recycle pickling sludge by using both solid-state reduction and smelting reduction methods. In order to completely separate the reduced metals from the sludge, the smelting reduction method would be preferred.
Godkänd; 2001; 20070313 (ysko)

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17

Mähl, Maria, e Johan Östlin. "Lean Remanufacturing : Material Flows at Volvo Parts Flen". Thesis, Uppsala University, Department of Business Studies, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7985.

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The after market is of great importance of a company’s competitiveness and an increasing part of its revenues can be derived from it. Remanufacturing, in focus of this thesis, is a great business opportunity and the European market has an enormous growth potential. In the USA it is a major business and the automotive industry, targeted in this thesis, sells approximately 60 million remanufactured automotive products compared to 15 million products in Europe for an equivalent stock of vehicles

Compared to manufacturing, the remanufacturing environment is a more complex business due to the high degree of uncertainty in the production process, mainly caused by two factors: the quantity and quality of returned cores. Overall, seven characteristics that make the remanufacturing material flow harder to control have been identified. Emerging in the 1990’s the concept of Lean production is a well-known method for improving the manufacturing capabilities of a company. Lean production, which is said to increase productivity, decrease lead-time and costs and enhance quality, is widely adopted.

In this thesis, the purpose is to explore what characteristics of the remanufacturing environment that can hinder the implementation of Lean production principles of material flows and how Lean principles can be employed in a remanufacturing environment.

In accordance, the theories of Lean production and Remanufacturing are used and the research methodology chosen that of a case study. To assess material flow, the production flows of five major product groups in a car engine are assessed. For the collection of data, Value Stream Mapping (VSM) methodology has been used.

The main result about material flows and how Lean principles can be employed in a remanufacturing environment have resulted in eight generic proposals. The main conclusion from these proposals is that the inherent characteristics of variable processing times and uncertainty in materials recovered have major negative impact for implementing a lean production process. Vice versa, given an accurate supply of parts for reassembly, all the principles of Lean production can be fully implemented in the phases of reassembly and testing.

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18

Duttala, Satish. "Virtual material processing artificial intelligence based process selection". Ohio : Ohio University, 2002. http://www.ohiolink.edu/etd/view.cgi?ohiou1174590077.

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19

HUSSAIN, TANVEER. "Transportation of Raw Material : Optimization of Production System and Reliability". Thesis, Högskolan Dalarna, Datateknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:du-4748.

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20

Dupin, Isabelle Valérie Simone. "Production and localisation of haze protective material from Saccharomyces cerevisiae /". Title page, table of contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phd934.pdf.

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21

Kim, Jae Hyun S. B. Massachusetts Institute of Technology. "Analysis of historical trends in material production and price volatility". Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119064.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2018.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 42-44).
Volatilities generate uncertainties in the market that critically impact the decisions of producers, consumers, and speculators alike. Historical trends in volatility can be studied as a means of better understanding current volatilities and predicting future ones in the industry. This study used the coefficient of variation (CV) as a relative metric to compare the historical production and price volatilities of various materials - 12 metals, cement, and steel - from 1900 through 2015. The long-term (1900-2015) and short-term (1995-2015) volatilities of these materials were quantified, and decades corresponding to periods of warfare and/or economic recession were shown to exhibit highest volatility. To complement the breadth of this approach, aluminum and steel were used as case studies to determine which factors - amongst production, consumption, energy price, and raw material price - drive trends in U.S. material price volatility. Volatility comparison graphs of material price and the factor in question were generated, and the root mean square (RMS) error between the volatilities was taken as a measure of their correlation. Volatilities in both aluminum and steel price were shown to correlate strongest with volatilities in raw material (bauxite and iron ore) price, with volatilities in steel also correlating comparatively with production and consumption dynamics. Overall, this study demonstrated the effectiveness of CV as a quantitative metric to assess historical volatilities and identified key market forces driving these volatilities for the aluminum and steel industries.
by Jae Hyun Kim.
S.B.

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22

Zhao, Ying, e 趙穎. "Optimization of cooperative material handling systems". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37837710.

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23

Shah, Purvin. "Optimizing usage of recycled material in a remanufacturing environment". Full text available, 2005. http://images.lib.monash.edu.au/ts/theses/shah.pdf.

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24

Östlin, Johan. "On Remanufacturing Systems : Analysing and Managing Material Flows and Remanufacturing Processes". Doctoral thesis, Linköpings universitet, Monteringsteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11932.

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The aim of remanufacturing is to retrieve a product’s inherent value when the product no longer fulfils the user’s desired needs. By taking advantage of this inherent value through different product recovery alternatives, there is a potential for both economically and environmental advantageous recovery of products. Remanufacturing is a complex business due to the high degree of uncertainty in the production process, mainly caused by two factors: the quantity and the quality of returned products. These factors have implications both on the external processes, e.g. coordinating input of returned products with the demand for remanufactured products, as well as the internal processes that coordinates the operations within the factory walls. This additional complexity needs to be considered when organising the remanufacturing system. The objective of this dissertation is to explore how remanufacturing companies can become more competitive through analysing and managing material flows and remanufacturing processes. The first issue discussed in this dissertation is the drivers that make companies interested in remanufacturing products in the first place. The conclusion is that the general drivers are profit, company policy and the environmental drivers. In a general sense, the profit motivation is the most prevalent business driver, but still there are situations where this motivation is secondary to policy and environmental drivers. Secondly, the need to balance the supply of returned products with the demand for remanufactured products shows that the possible remanufacturing volumes for a product are dependent on the shape of the supply and demand distributions. By using a product life cycle perspective, the supply and demand situations can be foreseen and support is given on possible strategies in these different supply and demand situations. Thirdly, how used products are gathered from customers is categorised by seven different customer relationship types. These types all have different effects on the remanufacturing system, and the characteristics of these relationships are disused in detail. When considering the remanufacturing process within the factory walls, a generic remanufacturing process was developed that divides the remanufacturing process into five different phases; pre-disassembly, disassembly, reprocessing, reassembly and the post-assembly phase. These different phases are separated by three different key decision points in the process that also have a major impact on the material planning of the process. For the remanufacturing material planning and production planning, the possibility to apply lean principles can be difficult. One foundation for implementing lean principles in new production is the existence of standardised processes that are stable and predictable. In the remanufacturing system, the possibilities to realise a predictable process is limited by the “normal” variations in quantity and the quality of the returned cores. Even though lean principles can be problematic to implement in the remanufacturing environment, this dissertation proposes a number of solutions that can be used to make the remanufacturing process leaner.

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Bakir, Mehmet Akif. "A hybrid analytic/simulation modelling approach to production planning". Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318629.

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26

Huynh, Thi Thu Thuy. "Capacity constraints in multi-stage production-inventory systems applying material requirements planning theory /". Linköping : Department od Production Economics, Linköping Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7355.

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27

Roberts, V. A. "The production of manganese zinc ferrite by the citrate gel route". Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380216.

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28

Choi, Soodong. "Material flow system integration in EOQ, ELSP, and Kanban production environments /". free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9901227.

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Tormes, Claudia Daiane. "Estudo e secagem de argila vermelha utilizando um sensor magnetoelástico". reponame:Repositório Institucional da UCS, 2014. https://repositorio.ucs.br/handle/11338/889.

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Uma das grandes aplicações dos sensores magnetoelásticos está relacionada aos sistemas antifurto. Devido ao seu excelente desempenho e natureza passiva sem fio, também têm sido amplamente utilizados no sensoriamento ambiental em resposta às mudanças de temperatura, pressão atmosférica, velocidade de fluxo do fluido através da superfície do sensor, densidade e viscosidade de líquidos e variação de massa. O presente trabalho investiga a utilização de fitas magnetoelásticas, tais como Metglas®2826MB3, para estudar o comportamento de secagem de materiais cerâmicos. Duas argilas extraídas da região do Vale do Caí, principal produtor de materias cerâmicos para a construção civil, foram analisadas. Suspensões de argila foram preparadas e sua caracterização foi realizada por meio de técnicas tradicionais que considerou a cinética de secagem, a retração e o comportamento das trincas de acordo com a massa úmida do material depositado em um molde de alumínio. Posteriormente as suspensões foram depositadas sobre a superfície da fita sensora com auxílio de um dispositivo doctor blade. Aplicando um campo magnético variável, foi possível determinar a frequência de ressonância experimental do sensor. Essa frequência é inversamente proporcional ao comprimento da fita e dependente das propriedades físicas dos materiais. Um modelo matemático foi utilizado para relacionar a frequência de ressonância com as propriedades elásticas da cobertura da fita. Além das propriedades físicas dos materiais também foi incluído ao modelo, a dependência do módulo de elasticidade da fita em campo magnético, conhecido como efeito E. A tensão desenvolvida durante o processo de secagem pode gerar trincas e deformações no material quando não dissipadas. Essa tensão contribui para a anisotropia magnética e é introduzida no problema através do efeito E. A técnica do cantilever foi utilizada para verificar a presença de tensões durante a secagem. Medindo a deflexão do substrato é possível determinar a tensão gerada pela suspensão. As curvas da frequência de ressonância em função do tempo mostram várias regiões distintas. Na região que distingue os dois principais estágios de secagem da suspensão, caracterizada pela taxa de secagem que diminui aceleradamente, a medida da frequência se mostrou bastante sensível à presença de tensões. Portanto, as estruturas observadas nas curvas experimentais de frequência em função do tempo puderam ser reproduzidas pelo modelo, utilizando a distribuição de tensões experimentais e as propriedades elásticas do sensor e da suspensão de argila. Esse resultado promissor sugere que as tensões desenvolvidas durante a secagem de materiais cerâmicos poderiam ser determinadas por medidas da frequência de ressonância dos sensores.
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An important application of magnetoelastic sensors is in antitheft systems. Because of their excellent performance and their passive wireless nature, they have also been extensively used in environmental sensing of changes in temperature, atmospheric pressure, flow speed of fluid over the sensor surface, density and viscosity of liquids and mass change. The present work investigates the use of magnetoelastic sensors based on Metglas®2826MB3 to study the drying behavior of ceramic materials. Two clays from the Vale do Caí region, the main producer of ceramic materials for the construction industry, were analyzed. Aqueous clay suspensions were prepared and their characterization was performed using traditional techniques that considered the drying kinetics, shrinkage and cracking behavior as a function of the wet weight of the material deposited into an aluminum mold. Subsequently, the suspensions were deposited on the sensor tape surface with a doctor blade device. Applying a variable magnetic field, it was possible to determine the experimental resonance frequency of the sensor. This frequency is inversely proportional to the ribbon length and dependent upon the physical properties of the materials. A mathematical model was used to correlate the resonance frequency with the elastic properties of the coating. Besides the physical properties of the materials, also included in model was the dependence of the tape's elastic modulus on magnetic field, known as the E effect. The stress developed during the drying process may cause cracks and deformations in the material when it is not dissipated. This stress contributes to the magnetic anisotropy which is introduced into the problem through the E effect. The cantilever technique was used to determine the presence of tensions during drying. Measuring the deflection of the substrate, it is possible to determine the stress generated by the suspension. The curves of resonance frequency versus time show several distinct regions. For the region that separates the two main rying stages of the suspension, the frequency measurement proved to be very sensitive to the presence of tension. Therefore, the structures observed in the experimental curves of frequency versus time could be modeled using the experimental distribution of stress and the elastic properties of the sensor and clay suspension. This promising result suggests that the tensions developed during the drying of ceramic materials could be determined by measurements of the resonance frequency of the sensors.

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Karlsson, Martin, e Gustaf Palm. "Mapping of order and purchasing processes at Processing Production Centre Lund - focusing on availability of material at production". Thesis, Linköpings universitet, Kommunikations- och transportsystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-131769.

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Processing Production Centre Lund (PPCL) är en affärsenhet inom Tetra Pak-koncernen som tillverkar processutrustning, förpacknings- och fyllningsmaskiner för livsmedel. I denna produktion är materialbrister vanligt förekommande vilket leder till kostsamma expressleveranser och icke värdeskapande arbete. Studiens mål är att identifiera problemkällor samt presentera förbättringsförslag för att minska antalet materialbrister i syfte att öka PPCLs leveransprecision, minska förekomsten av icke värdeskapande arbete samt reducera användandet av expressfrakt. Med hjälp av observationer, intervjuer och litteraturstudier har företagets arbetsprocesser kartlagts. Genom att jämföra de observerade arbetsprocesserna med de föreskrivna har de föreskrivna arbetsprocesserna konstaterats vara alltför generellt beskrivna, och ibland föråldrade, för att vara direkt tillämpbara för de anställda. Med flödesanalysmetoder har icke värdeskapande arbete belysts, problemkällor för delprocesser har påvisats och alternativa arbetsprocesser har föreslagits. Denna studie föreslår processutbildning för företagets anställda och bättre informationsdelning vid processuppdateringar. Detta skulle medföra en större insikt om hur egna handlingar påverkar andra samt leda till mer standardiserade arbetssätt. Vidare rekommenderas att de anställda tas med i arbetet med att ta fram detaljerade arbetsprocesser, bland annat för att utnyttja fördelarna med etablerade workarounds. Denna studie föreslår en ny process att följa vid ändringar i materialbehov, vilken skulle leda till bättre informerade materialval i tidigare skede. Dessutom rekommenderas striktare riktlinjer för när ändringar i materialval ska accepteras av PPCL utan förbehåll. Vidare klarlägger studien problem med de data som finns tillgängliga i Tetra Paks affärssystem. Felaktiga parametrar gällande ledtider på material från leverantörer och outnyttjade hjälpmedel vad gäller material som avbeställs eller ersätts leder ofta till materialbrister i produktionen. Studien lyfter fram standardiserade arbetsmetoder samt jämnare fördelning av arbetsbelastning för dem anställda som möjliga åtgärder till dessa problem. Stora materialgrupper som innefattar material med lång leveranstid leder ofta till materialbrist när behovet specificeras i ett sent skede. Denna studie föreslår artikelstandardisering och ett bättre informationsflöde mellan inköp och den som specificerar materialbehovet. Detta skulle minska uppkomsten av materialbrister. Ett annat problemområde som tas upp i studien är uppdelningen av de två affärsenheterna som är inblandade i orderflödet. Underutvecklade processer, dubbelarbete och få kommunikationskanaler är några av de problem som tas upp. Tvärorganisatoriska förbättringsprojekt förespråkas i studien för att förbättra och effektivisera detta samarbete för att i förlängningen minska antalet materialbrister. Slutligen rekommenderas att de ledtider som utlovas till slutkunderna ses över för att spegla verkliga ledtider på ett mer korrekt sätt. Felaktiga ledtider dömer produktionen till ett arbete under tidspress vilket innebär att det kontinuerliga förbättringsarbetet försakas.

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31

Fischbein, Ellinor, e Felicia Larsson. "Metallurgical analysis of some osmund iron from Sweden and Estonia : A short historical review of medieval iron production and export". Thesis, KTH, Materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298414.

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During the Middle Ages, Sweden was a coveted exporter of high-quality iron in Europe. Bloomery furnaces could have produced osmund iron. However, most osmund iron was produced in blast furnaces. The iron was then treated in the finery process and cut into pieces. Previous studies establish osmund iron’s definition regarding properties, microstructure and trace elements. They were often slag-rich and varied greatly in carbon content, proportion of inclusions, corrosion and microstructure. The report examined osmund iron as related to medieval iron production, exports and quality. This was done by comparing the microstructures and slag inclusions in Swedish and Estonian pieces of medieval iron, through analyses by SEM-EDS and under an optical microscope. The Estonian samples had more slag inclusions. The samples with corroded inclusions/slag were rejected. The varying microstructure can be linked to the cooling rate and the actual production in the blast furnace, bloomery furnace and finery process. It gave materials with poor properties. A large proportion of the samples had one side with a higher carbon content while the other had lower carbon content. The iron with lower carbon content could be connected to come from the bloomery furnace and the higher to the blast furnace. The samples containing higher levels of silica, magnesium and calcium could be connected to the blast furnace. In summary, the Swedish samples were of better quality than the Estonian ones and all pieces were considered to come from the blast furnace.
Under medeltiden var Sverige en eftertraktad exportör av högkvalitativt järn i Europa. Osmundjärn kunde produceras i en blästerugn, men det mesta osmundjärnet framställdes i masugnen. Därefter färskades järnet och höggs upp i delar. Tidigare analyser definierar osmundjärns utseende, egenskaper, mikrostruktur och spårämnen. De var ofta slaggrika och varierade mycket i kolhalt, andel inneslutningar, mikrostruktur och mängd korrosion. I den här studien analyserades osmundjärn relaterat till medeltida järnframställning, export och kvalité. Det gjordes genom att jämföra mikrostrukturer och slagginneslutningar i svenska och estniska prover av medeltida järn, genom analyser i SEM-EDS och i ljusmikroskop. De estniska proverna hade mer slagginneslutningar. Proverna med korroderade inneslutningar/slagg uteslöts ur analysen. Den varierande mikrostrukturen kan kopplas till kylningshastigheten och själva produktionen i masugnen, blästerugnen och färskningsprocessen. Det gav material med dåliga egenskaper. En stor andel prover hade en sida med högre kolhalt och den andra delen hade lägre kolhalt. Järnet med lägre kolhalt kan kopplas till att komma från blästerugnen och det med högre kolhalt till masugnen. De proverna som innehöll högre halter kiseldioxid, magnesium och kalcium kan kopplas till masugnen. De svenska proverna hade sammanfattningsvis bättre kvalité än de estniska och alla bitar ansågs komma från masugnen.

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32

Koca, Asli. "Authentication Of Space: The Photograph As A Raw Material For Architectural Production". Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611454/index.pdf.

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This thesis is a critical reconsideration of the relationship of architectural production with its unique mode of representation: &ldquo
photography.&rdquo
Photography has been interpreted essentially as a technique and a visual medium to document architecture in general. The &ldquo
photograph,&rdquo
in this sense, is regarded as a representational form of documentation and an artistic and material expression of architecture. Besides this conventional value, this study argues that photography not only provides a new medium for the reinterpretation of architectural space, but also a new material and technique for architectural production. In this respect, this study discusses photography as an emerging tool for architecture in which the photograph is conceived as a raw material. As in the manufacturing of a raw material in an industrial process, the main argument of this study is that as long as a photograph is processed with required components, it contributes to architectural production in a comparable manner. Even it has the potential to produce architectural space in its own right. To understand the nature of this architectural space supported by a variety of physical and non-physical characteristics of photography, this study compares two different ways of architectural production with the aid of photographs. Starting with the assumption that there is a radical change in the conception of photography in architecture from an immaterial quality to material essence, this study argues that the photograph is a raw material that can be used to authenticate architectural space from the initial idea to the built object. Therefore, drawing attention to the changed value of photography for architecture over time, the aim of this study is to establish a critical framework to understand and discuss this contemporary function of photography in architecture.

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33

Gustafsson, Björn. "Optimization of material in proton-therapy collimators with respect to neutron production". Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-162510.

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In this thesis, a study of neutron production properties for collimator materials is performed. Collimators are used in nuclear physics applications such as within the fields of nuclear energy and radiotherapy. The area of application is primarily reduction of static or unwanted radiation for detectors and treatment beams. This study focuses on a branch of radiotherapy called proton therapy where protons of high energies impinge on the collimator. Proton therapy has advantages compared to common radiotherapy techniques due to the energy deposition characteristics of protons. However, high-energy protons cause nuclear reactions in the dose delivery equipment, especially in the collimators. These reactions produce neutron radiation which is both hazardous and difficult to shield from. The choice of different collimator materials has previously not been thoroughly evaluated with respect to neutron production. In this thesis, the neutron production properties of different materials have been evaluated by running simulations with the Monte Carlo particle transport code MCNPX. In an initial survey, some materials of particular interest could be identified. In a second stage, dose calculations in a patient dummy, i.e., a water phantom, were performed. This was done in order to confirm that the lower neutron production of the interesting materials could reduce the biological effect. It is shown that common collimator materials presently used indeed are suboptimal with respect to neutron production. The common collimator material tungsten should not be recommended for use based on the result of this study. Replacing it with nickel, iron or brass will reduce the neutron dose by approximately 30%, which would lead to a reduction of late effects due to proton treatments.

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34

Smith, Helen. "'Grossly material things' : women and textual production in England, c. 1550-1650". Thesis, University of York, 2003. http://etheses.whiterose.ac.uk/9844/.

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35

Babapour, Ayda Barid, e Maryam Nadalipour Gavitar. "Investigation of yeast Grown in SSF Dring Biothanol Production from Lignocellusosic Material". Thesis, Högskolan i Borås, Institutionen Ingenjörshögskolan, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-16498.

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Ethanol produced from lignocellulosic biomass has the potential to become a promisingalternative to gasoline. In this work the simultaneous saccharification and fermentation (SSF)technology was applied for ethanol production from hardwood with focus on cell growth,ethanol production and contamination.The SSF was performed at PH 5.5 and 35°C for different suspended solid concentrations(8%, 10% and 12%) of pretreated birch slurry which contained 16 % total suspended solids.Two different hexose fermenting yeast strain (Ethanol Red) and pentose fermenting yeaststrain were used.Quantifying the concentration of chemical components and metabolites in the fermentationmedium demonstrated that glucose and xylose are the major fermentable sugars in the slurry.The higher load of slurry (12%) represents a higher content of carbohydrates and potentiallyhigher end concentration of ethanol. Moreover, more lactic acid is produced with the lowerload of slurry (8 % or 10 %), presumably due to a result of a less inhibitory environment forbacterial growth. In this context, acetic acid sticks out as the most important inhibitor withconcentrations of 15.2 and 12.5 and 9.7 g/l respectively in the 12 %, 10 % and 8 % (ofsuspended solids) trials. Using pentose fermenting yeast may lead to higher ethanolproduction, lower xylose uptake and lower lactic acid formation. Cell viability and cellvitality determination from fermentation media in all the trails represented a sharplydecreasing trend during the fermentation for both Ethanol Red yeast strain and the pentosefermenting strain yeast strain apparently due to cell decomposition.
Program: MSc in Resource Recovery - Industrial Biotechnology

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36

Tarasenko, H., S. Garkavenko, N. Borschevska, M. Nyschyshyn e M. Popova. "Development technology of production biocidal and deodorizing agent from plant raw material". Thesis, Київський національний університет технологій та дизайну, 2018. https://er.knutd.edu.ua/handle/123456789/12015.

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37

Gunnarsson, Rickard. "Titanium oxide nanoparticle production using high power pulsed plasmas". Licentiate thesis, Linköpings universitet, Plasma och beläggningsfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-128622.

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This thesis covers fundamental aspects of process control when growing titanium oxide nanoparticles in a reactive sputtering process. It covers the influence of oxygen containing gas on the oxidation state of the cathode from which the growth material is ejected, as well as its influence on the particles oxidation state and their nucleation. It was found that a low degree of reactive gases was necessary for nanoparticles of titanium to nucleate. When the oxygen gas was slightly increased, the nanoparticle yield and particle oxygen content increased. A further increase caused a decrease in particle yield which was attributed to a slight oxidation of the cathode. By varying the oxygen flow to the process, it was possible to control the oxygen content of the nanoparticles without fully oxidizing the cathode. Because oxygen containing gases such as residual water vapour has a profound influence on nanoparticle yield and composition, the deposition source was re-engineered to allow for cleaner and thus more stable synthesis conditions. The size of the nanoparticles has been controlled by two means. The first is to change electrical potentials around the growth zone, which allows for nanoparticle size control in the order of 25-75 nm. This size control does not influence the oxygen content of the nanoparticles. The second means of size control investigated was by increasing the pressure. By doing this, the particle size can be increased from 50 – 250 nm, however the oxygen content also increases with pressure. Different particle morphologies were found by changing the pressure. At low pressures, mostly spherical particles with weak facets were produced. As the pressure increased, the particles got a cubic shape. At higher pressures the cubic particles started to get a fractured surface. At the highest pressure investigated, the fractured surface became poly-crystalline, giving a cauliflower shaped morphology.

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38

Cheung, Wing Sze. "A study of material handling system for apparel industry /". View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?IEEM%202005%20CHEUNG.

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39

Rocha, André Dionísio Bettencourt da Silva. "An agent based architecture for material handling systems". Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/10504.

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Dissertação para obtenção do Grau de Mestre em Engenharia Electrotécnica e de Computadores
In the recent past, market requirements and consequently the production lines changed too. With the customization of products and the growing number of products to produce, the dy-namism and flexibility of the lines are now requirements of extreme importance. A traditional approach indicates great difficulty in satisfying those needs and as such has appeared some proposals in order to solve them. The proposed approaches are mostly related to scheduling and production planning. The transportation system is not usually inserted in the control architecture and system reconfiguration, constantly being put aside in order to this issue. This work proposes architecture to support self-organized transportation system, where it performs control functions and management. The architecture was developed for a system com-prising conveyors where the stations operate. The proposed work is a multi-agent architecture that use Dijkstra’s algorithm to improve the routing of products and materials. The main features of architecture are load balancing pre-sent in conveyors and ability to plug and unplug stations in runtime. The architecture was first tested in a virtual environment in order to check the behavior of the same and was subsequently tested in a real industrial cell in order to demonstrate its use in a real system.

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40

Bakkalbasi, Omer. "Flow path network design and layout configuration for material delivery systems". Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/25617.

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41

Gigrich, James S. "Comparison of Silver-Meal and Wagner-Whiten procedures for material requirements planning under varying demand". Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/30778.

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42

Laurenson, Sarah. "Materials, making and meaning : the jewellery craft in Scotland, c. 1780-1914". Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25848.

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This thesis examines the jewellery craft in Scotland between 1780 and 1914 with a focus on the relationship between materials, making processes, and the social and cultural meanings of objects. While dominant narratives of craft in this period frame producers as the victims of industrialisation, this thesis considers Scotland’s jewellers as cultural actors who shaped their own worlds during a period of profound economic, social and cultural change. A material culture approach is employed to examine the work of Scotland’s jewellers through the things they made. Fusing object-based research with a wide range of visual and textual sources, the thesis shows how producers applied their skill, knowledge and creativity to manipulate raw matter into meaningful objects that not only reflected, but brought about wider social and cultural shifts. Through a focus on materiality, the thesis builds on new methodological approaches to the history of material culture to show how the mutable meanings of matter and workmanship impacted on the ways in which jewellery was produced, consumed, worn and perceived. Scotland provides a rich area of focus for this study. The country has a long history of quality craft production in jewellery and silverware, with the geological and natural diversity of the region providing jewellers with precious metals, coloured stones and freshwater pearls. The study examines industry dynamics, artisanal education and making processes to show how jewellers fashioned an image of their craft that was rooted in ideas of history, inherited skill and quality. The life cycle of native materials is traced from their raw state through the workshop and on to owners’ bodies to reveal how changes in workshop production were inseparable from shifting aesthetics and cultural ideas relating to nature, landscape and the past. These findings complicate the persistent myth of the decline of craft as a result of industrialisation to show that the desire for Scottish-made jewellery stimulated new and revived skills and trades that cut across urban and rural areas. While the thesis is geographically specific to Scotland, it places luxury producers within the interdisciplinary domain of cultural history to provide new insights into the study of the multifaceted transformations that marked British industry during the long-nineteenth century.

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43

Hill, Nicholas D. "Transportation for a large manufacturing site : the case of GKN-Westland Engineering Ltd, Yeovil". Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286561.

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44

Wan, Yen-Tai. "Material transport system design in manufacturing". Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-03282006-231022/.

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Thesis (Ph. D.)--Industrial and Systems Engineering, Georgia Institute of Technology, 2006.
Dr. Yih-Long Chang, Committee Member ; Dr. Martin Savelsbergh, Committee Member ; Dr. Leon McGinnis, Committee Co-Chair ; Dr. Gunter Sharp, Committee Chair ; Dr. Doug Bodner, Committee Member ; Dr. Joel Sokol, Committee Member.

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45

Shahbazi, Sasha. "MATERIAL EFFICIENCY MANAGEMENT IN MANUFACTURING". Licentiate thesis, Mälardalens högskola, Innovation och produktrealisering, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-28004.

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Material efficiency is a key solution to provide a reduction in the total environmental impact of global manufacturing, which contributes to avoid generating larger volumes of industrial waste, to reduce extracting and consuming ever more resources and to decrease energy demand and carbon emissions. However, the area of material efficiency in manufacturing has been under-researched and related knowledge is limited. The research objective of this thesis is to contribute to the existing body of knowledge regarding material efficiency in manufacturing - to increase understanding, describe the existing situation and develop support for improvement. This thesis focuses on value of process and residual materials in material efficiency: to increase homogenous quality of generated waste with higher segregation rate, decreasing the amount of material becoming waste and reduce total virgin raw material consumption without influencing the function and quality of a product or process. To achieve the objective, material efficiency strategies, existing state of material efficiency in manufacturing and barriers that avert higher material efficiency improvement have been investigated. The results are supported by four structured literature reviews and two [MW1] empirical multiple case studies at large global manufacturing companies in Sweden, mainly automotive. Empirical studies include observations, interviews, waste stream mapping, waste sorting analysis, environmental report reviews and walkthroughs in companies to determine the material efficiency and industrial waste management systems. The empirical results revealed that material efficiency improvement potential of further waste segregation to gain economic and environmental benefits is still high. Determining different waste segments and relative fractions along with calculating material efficiency performance measurements facilitate improvements in material efficiency. In addition to attempts for waste generation reduction, avoiding blending and correct segregation of different waste fractions is an essential step towards material efficiency. The next step is to improve the value of waste fractions i.e. having more specific cost-effective fractions. Waste Flow Mapping proves to be an effective practical tool to be utilized at manufacturing companies in order to check and explore the improvement opportunities. In addition, a number of barriers that hinder material efficiency was identified. The most influential material efficiency barriers are Budgetary, Information, Management and Employees. The majority of identified material efficiency barriers are internal, originate inside the company itself and are dependent upon the manufacturing companies’ characteristics. As a result, management and employees’ attitude, environmental knowledge and environmental motivation, as well as their internal communication and information sharing, and companies’ core value and vision are the enablers for material efficiency improvement.
MEMIMAN
INNOFACTURE - innovative manufacturing development

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46

FURUSAWA, HELIO A. "Razão isotópica de enxofre em material atmosférico por ICPMS de alta resolução". reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11632.

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Made available in DSpace on 2014-10-09T12:54:07Z (GMT). No. of bitstreams: 0
Made available in DSpace on 2014-10-09T14:09:24Z (GMT). No. of bitstreams: 1 12435.pdf: 4820144 bytes, checksum: 0d8279d9b23571886f63adee62a8b6f4 (MD5)
Tese (Doutoramento)
IPEN/T
Instituto de Quimica, Universidade de Sao Paulo - IQ/USP

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47

Krauss, Alan. "Control of run-by-run processes with applications to large-area material deposition". Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/14685.

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48

Huynh, Thi Thu Thuy. "Capacity Constraints in Multi-Stage Production-Inventory Systems : Applying Material Requirments Planning Theory". Doctoral thesis, Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7355.

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In this thesis, capacity-constrained aspects of multi-level, multi-stage productionplanning are investigated. The aim has been to extend Material Requirements Planning Theory (MRP Theory) to cover more general problems dealing with capacity constraints, in particular when non-zero lead times are present and the processes take place in continuous time. MRP Theory deals with multi-level production systems with multiple items taking place either within a discrete or continuous time framework. External demand is considered either deterministic or stochastic. Lead times are assumed to be given constants, and the Net Present Value Principle has been applied as the objective function. The Bill-of-Materials, capturing component as well as capacity requirements, in volume as well as in advanced timing due to lead times, has been described using a generalised input matrix involving Laplace transforms or z transforms. In order to be able to apply Dynamic Programming as a solution method, the system state has been defined and designed in terms of a matrix, in which historical values of cumulative production and cumulative demand are given state variables. A high power computer has been used to calculate solutions to numerical examples. Moreover, this thesis examines the fundamental equations of MRP Theory in order to analyse the possibility to obtain closed-form expressions for the time development of the system, when standard ordering rules of MRP are applied. In addition, capacity-constrained production planning problems and procedures in a paper mill have been surveyed and are presented in the form of a case study.

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49

Spangler, Pauline E. "Living in (im) material worlds modes of production and consumption in utopian literature /". Connect to this title online, 2009. http://etd.lib.clemson.edu/documents/1249066116/.

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50

Bucknall, Joanna Jayne. "Participative dramaturgy and the material creatorly participant : a theory of production and reception". Thesis, University of Winchester, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.548199.

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Tesi sul tema "Material production"

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