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Dissertations / Theses on the topic 'Tool material'
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Sun, Jiake, and Wenjie Jiang. "Analysis Tool for Warehouse Material Handling Data." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-15205.
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Effective material handling plays a key role in cutting costs. Well-organized material handling can cut production cost by optimizing product transfer paths, decreasing the damage rate and by increasing the utilization of storage space. This report presents the development of an analysis system for StoraEnso Hylte’s paper reel database. The system extracts and classifies key points from the database which are related to material handling; like attributes related to the product (paper reel), forklift truck information and storage cell utilization. The analysis based on paper reels includes the damage rate and transfer paths of paper reels. A mathematical model is also presented, which tells us that the probability of damage per transport is more important than the number of transports for paper reels handling. The effect of decreasing non-optimal transportation (optimize the path) is very small.
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Ford, David Grant. "Assessment tool for nuclear material acquisition pathways." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2786.
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Anderson, Wilhelm Friedrich. "NPSME - An Interactive Tool for Material Characteristics Specification." Thesis, Monterey, California: Naval Postgraduate School, 1990. http://hdl.handle.net/10945/43845.
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A general tool capable of interactively creating, displaying, modifying, and managing lists of material
specifications is required for the display of 3D icons on the Silicon Graphics Inc. IRIS 4D workstation. The Naval
Postgraduate School Material Editor (NPSME) fulfills these requirements using an interactive interface and provides
direct support for the Naval Postgraduate School's Command and Control Workstation of the Future project.
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Rosochowska, Malgorzata. "The influence of tool excitation on material deformation." Thesis, University of Strathclyde, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288635.
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Palmer, Candice Alemay. "Flux response technology : a universal tool for material characterisation." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/11247.
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Norris, James D. "DID STONE RAW MATERIAL DIFFERENCES INFLUENCE PREHISTORIC TOOL-MAKING?" Kent State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=kent1586434796098326.
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Guarnera, Dar'ya. "Image based surface reflectance remapping for consistent and tool independent material appearence." Thesis, Loughborough University, 2018. https://dspace.lboro.ac.uk/2134/33410.
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Physically-based rendering in Computer Graphics requires the knowledge of material properties other than 3D shapes, textures and colors, in order to solve the rendering equation. A number of material models have been developed, since no model is currently able to reproduce the full range of available materials. Although only few material models have been widely adopted in current rendering systems, the lack of standardisation causes several issues in the 3D modelling workflow, leading to a heavy tool dependency of material appearance. In industry, final decisions about products are often based on a virtual prototype, a crucial step for the production pipeline, usually developed by a collaborations among several departments, which exchange data. Unfortunately, exchanged data often tends to differ from the original, when imported into a different application. As a result, delivering consistent visual results requires time, labour and computational cost. This thesis begins with an examination of the current state of the art in material appearance representation and capture, in order to identify a suitable strategy to tackle material appearance consistency. Automatic solutions to this problem are suggested in this work, accounting for the constraints of real-world scenarios, where the only available information is a reference rendering and the renderer used to obtain it, with no access to the implementation of the shaders. In particular, two image-based frameworks are proposed, working under these constraints. The first one, validated by means of perceptual studies, is aimed to the remapping of BRDF parameters and useful when the parameters used for the reference rendering are available. The second one provides consistent material appearance across different renderers, even when the parameters used for the reference are unknown. It allows the selection of an arbitrary reference rendering tool, and manipulates the output of other renderers in order to be consistent with the reference.
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Kumar, Mayank. "Dynamic characterization of the tool holder material : An Experimental Thesis." Thesis, KTH, Industriell produktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-183091.
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The major factors putting limitation to high productivity and good product surface quality is machining vibration. A lot of scientific research has been concentrated controlling the vibration while machining. There is a good sum of research going in department of production engineering at KTH to find out ways to reduce the machining vibration and enhancing the productivity but so far, they have been concentrated only on use of conventional steel as there of cutting tool. This they have tried by introducing damping in the conventional steel tooling system or by coating the tool with different composition of materials to improve the tool resistances to vibration.In this paper, the research has been concentrated to finding out an alternative material to conventional steel, which is more resistance to machining vibration. The theory in the paper is mainly concentrated to give the basic understanding about frequency response function, forced vibration, and stability lobe diagram (SLD) and their applications. Through experimental modal analysis (EMA), machining tests and surface roughness of the machined surface (toolox 33 plates), SSAB toolox 44 steel cutting tool is compared against its counterpart the conventional steel (H13). The natural frequencies and damping factor are obtained for both free hanging and attached to machine condition. Afterwards, a stability lobe diagram is being plotted using the EMA data. Machining tests are being conducted according to SLD to their limits to determine and verify the material capability until tools starts showing vibrations.In the end, the results is being compared by analyzing the sound emitted during the machining process and determining the surface roughness of the machined surface both visually and by white light interferometry. Then comparing the toolox 44 with conventional steel (H13), to find out which one is more resistance to vibrations.
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Thompson, Brian Thomas. "Tool Degradation Characterization in the Friction Stir Welding of Hard Metals." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1273602433.
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Karlsson, Patrik. "The influence of tool steel microstructure on galling." Doctoral thesis, Karlstad universitet, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-61013.
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In sheet metal forming (SMF) of materials such as stainless steels there is a major problem with transfer and accumulation of sheet material to the metal forming tool surface. The problem is known as galling; a sort of severe adhesive wear, which results in severe scratching of produced parts. In this thesis, the overall aim was to gain knowledge of the influence of tool steel microstructure on galling initiation under sliding conditions. It was discovered that material transfer and tool steel damage caused by sheet material flow creating wear-induced galling initiation sites occurred in the early stage of galling. The galling resistance was higher for tool steels with higher matrix hardness due to better resistance to tool steel damage. Initial friction and critical contact pressure to galling was influenced by the strength of the sheet material. Material transfer happened at low pressures and the friction value was high in a case of sheet materials with lower proof strength, possibly due to the sheet contact against the tool steel matrix resulting in high adhesion and quicker tool damage. It was demonstrated that, in addition to hardness of the tool steel matrix and sheet material proof strength, tool steel microstructural features like size, shape, distribution and height of hard phases are important parameters influencing galling. Tool steels comprising homogeneously distributed, small and high hard phases better prevented the contact between sheet material and the tool steel matrix. Thus, a metal to metal contact with high friction was more efficiently avoided, which resulted in better tool performance.
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Rydberg, Anders. "DNA Barcoding as a Tool for the Identification of Unknown Plant Material." Thesis, Uppsala universitet, Systematisk biologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-141813.
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Houskamp, Joshua Robert Kalidindi Surya. "Microstructure sensitive design : a tool for exploiting material anisotropy in mechanical design /." Philadelphia, Pa. : Drexel University, 2005. http://dspace.library.drexel.edu/handle/1860/724.
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Smith, Clifford A. (Clifford Allen) 1972. "Simulation model used as design improvement decision tool for warehouse material flow." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34830.
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Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; in conjunction with the Leaders for Manufacturing Program at MIT, 2005.Includes bibliographical references (p. 109-110).
The basis for this thesis involved a six and a half month LFM internship at Efficient Storage, Shipping, and Selection. ES3, Efficient Storage, Shipping, and Selection, is a third party logistics firm that specializes in a vendor-neutral consolidation model for the food distribution industry. ES3 receives, stores, and ships multi-vendor products through a distribution center (DC) in York, Pennsylvania. The product is moved and stored by an Automated Storage and Retrieval System (ASRS) which consists of a network of conveyors, vertical lifts, and Selection and Retrieval Machines (SRMs). The ASRS system is not performing to the designed put-away and shipping rates, thus limiting the DC's overall performance during peak operations. The warehouse operations and warehouse design teams had numerous design suggestions for improving the ASRS operations, but it was difficult to predict the enhancement or impact on performance. A simulation model for the inbound system was created to analyze the impact, prioritize, and develop new ideas for improving the system.
by Clifford A. Smith.
S.M.
M.B.A.
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Bonilla, Hernández Ana Esther. "Analysis and direct optimization of cutting tool utilization in CAM." Licentiate thesis, Högskolan Väst, Forskningsmiljön produktionsteknik(PTW), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-8672.
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The search for increased productivity and cost reduction in machining can be interpreted as the desire to increase the material removal rate, MRR, and maximize the cutting tool utilization. The CNC process is complex and involves numerous limitations and parameters, ranging from tolerances to machinability. A well-managed preparation process creates the foundations for achieving a reduction in manufacturing errors and machining time. Along the preparation process of the NC-program, two different studies have been conducted and are presented in this thesis. One study examined the CAM programming preparation process from the Lean perspective. The other study includes an evaluation of how the cutting tools are used in terms of MRR and tool utilization. The material removal rate is defined as the product of three variables, namely the cutting speed, the feed and the depth of cut, which all constitute the cutting data. Tool life is the amount of time that a cutting tool can be used and is mainly dependent on the same variables. Two different combinations of cutting data might provide the same MRR, however the tool life will be different. Thereby the difficulty is to select the cutting data to maximize both MRR and cutting tool utilization. A model for the analysis and efficient selection of cutting data for maximal MRR and maximal tool utilization has been developed and is presented. The presented model shortens the time dedicated to the optimized cutting data selection and the needed iterations along the program development.
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Palmer, Andrew. "The Design and Development of an Additive Fabrication Process and Material Selection Tool." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3635.
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In the Manufacturing Industry there is a subset of technologies referred to as Rapid Technologies which are those technologies that create the ability to compress the time to market for new products under development . Of this subset, Additive Fabrication (AF), or more commonly known as Rapid Prototyping (RP), acquires much attention due to its unique and futuristic approach to the production of physical parts directly from 3D CAD data, CT or MRI scans, or data from laser scanning systems by utilizing various techniques to consecutively generate cross-sectional layers of a given thickness upon the previous layer to form 3D objects. While Rapid Prototyping is the most common name for the production technology it is also referred to as Additive Manufacturing, Layer Based Manufacturing, Direct Digital Manufacturing, Free-Form Fabrication, and 3-Dimensional Printing. With over 35 manufacturers of Additive Fabrication equipment in 2006 , the selection of an AF process and material for a specific application can become a significant task, especially for those with little or no technical experience with the technology and to add to this challenge, many of the various processes have multiple material options to select from . This research was carried out in order to design and construct a system that would allow a person, regardless of their level of technical knowledge, to quickly and easily filter through the large number of Additive Fabrication processes and their associated materials in order to find the most appropriate processes and material options to create physical reproductions of any part. The selection methodology used in this paper is a collection of assumptions and rules taken from the author's viewpoint of how, in real world terms, the selection process generally takes place between a consumer and a service provider. The methodology uses those assumptions in conjunction with a set of expert based rules to direct the user to a best set of qualifying processes and materials suited for their application based on as many or as few input fields the user may be able to complete.M.S.
Department of Industrial Engineering and Management Systems
Engineering and Computer Science
Industrial Engineering MS
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Kristoffersson, Sara. "Development of training material for a process analysis tool in the paper industry." Thesis, KTH, Lärande, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279059.
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Paperboard is accessible for everyone, such as packaging for provisions or beauty products. Paperboard consists of several layers of pulp and has different types of qualities depending on the material’s area of use. Within the paperboard production, the process behavior is analyzed to find solutions to decrease the product variations in order to reach the desired product results. Process analyses are continuously made to improve paperboard production and avoid defects in the paperboard product. The company Holmen has recently implemented a new process analysis tool on trial, named Wedge, at the paperboard mill in Workington, UK, which is a software tool that can be used for analyzing the paperboard process. Holmen’s vision was to develop training material for the software tool that could be used by the employees for educational purposes.The purpose of this project degree was to develop training material of the process analysis tool, i.e. the software Wedge, for novice learners. Initially, the purpose was to examine and identify the employees’ learning within the software tool at the mill in Workington. Based on that, training material was developed that could be used for self-directed learning material.The study was conducted through qualitative methods, which included a group interview with development engineers and a one-to-one interview with the training manager at the Workington mill. Additionally, observations of training opportunities and an evaluation questionnaire of the training material were used in this study. Based on these results, a thematic analysis was conducted where identified themes have been interpreted from aspects of cognitive learning and adult learning.The result is based on the qualitative survey and the analysis of the interviews and questionnaire responses indicates that the training material is suitable and pedagogical for novice learners. The development engineers mean, among other things, that computer-based training should contain ‘step-by-step’ examples of work-related situations and the training must be organized such that new information will not be overwhelming and unintelligible. It is also important that new knowledge or information can be acquired both visually and by text-based instructions, to be able to provide the learners with various kinds of teaching aids since there are different approaches to learn new knowledge. Therefore, the training material based on e-learning has been designed as a first lesson of how to use and navigate in the process analysis tool. The developed training material entails four interactive videos with incremental learning of how the process analysis tool can be used in the paper industry.Materialet kartong är något alla har till hands, som exempelvis förpackningar för proviant eller skönhetsprodukter. Kartong består av flera lager av pappersmassa och har olika typer av kvalitéer beroende på materialets användningsområde. Inom produktionen görs analyser av kartongprocessens beteende för att hitta lösningar som minskar produktvariationerna och på så sätt uppnå önskade slutresultat. Processanalyser görs kontinuerligt för att förbättra kartongproduktion och därmed undvika produktdefekter. Företaget Holmen har implementerat ett nytt processanalysverktyg, så kallat Wedge, på deras kartongbruk i Workington, UK, vilket är en programvara som kan användas för att kunna göra analyser av kartongprocess. Holmen önskade att ett utbildningsmaterial för programvaran skulle utvecklas och kunna användas i utbildningssyfte för produktionsarbetarna.Syftet med detta examensarbete var att utveckla ett utbildningsmaterial för nybörjare av processanalysverktyget Wedge. Grunden till detta låg i att undersöka och identifiera de anställdas lärande utifrån programvarans utbildning på kartongbruket i Workington. Baserat på detta utvecklades ett utbildningsmaterial som kan användas som ett självstuderande lärandemedel.Undersökningen har utförts av kvalitativa metodval som innefattar en gruppintervju med utvecklingsingenjörer och en intervju med utbildningsansvarig på kartongbruket i Workington, samt observationer av utbildningstillfällen och enkäter för utvärdering av utbildningsmaterialet. Baserat på detta har en tematisk analys genomförts där identifierade teman har tolkats utifrån ett kognitivt lärandeperspektiv och vuxnas lärande.Resultatet baseras på den kvalitativa undersökningen och analys av intervjuerna och enkäterna visar på att utbildningsmaterialet är passande och ligger på en bra pedagogisk nivå för nybörjare. Utvecklingsingenjörerna önskar bland annat att en datorbaserad utbildning ska innehålla förberedda ’steg-för-steg’-exempel utifrån verklighetsbaserade problem samt att utbildning måste organiseras sådan att ny information inte blir överväldigande och svårförståelig. Det är även viktigt att ny kunskap och information kan fås både visuellt och textbaserat, och att en blandning mellan olika läromedel finns eftersom personer har olika strategier för att lära sig ny kunskap. Utifrån detta har ett utbildningsmaterial, baserat på e-lärande, utvecklats och skapats med ändamålet att fungera som en första lektion av hur en kan använda och navigera i processanalysverktyget. Det utbildningsmaterial som har utvecklats innefattar fyra interaktiva videos som är uppbyggda för stegvis inlärning om hur processanalysverktyget kan användas i pappersindustrin.
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Kuhlmann, Julia. "Sensing as a tool to monitor magnesium based material corrosion in aqueous solutions." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1337351749.
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Heflin, Ashley Shew. "What Dolphins Want: Animal Intentionality and Tool-Use." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/31748.
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In this thesis, I argue that at least some animals have the sort of intentionality philosophers traditionally have only ascribed to humans. I argue for this through the examination of tool-use among New Caledonian crows and Bottlenose dolphins. New Caledonian crows demonstrate advanced tool-manufacture and standardization, while Bottlenose dolphins use social learning to a much greater degree than other animals. These two case studies fit nicely with many of the non-linguistic accounts of intentionality employed by philosophers.
This thesis is aimed at showing that our basic philosophical concept of intentionality leaves room for intentional behavior on the part of non-human animals. Descriptions of human behavior are often contrasted with that of â lowerâ animals. Many have taken rationality as the characteristic that separates us from animals, and our notions about the superiority of humans have been passed down through theology and philosophy. From Plato onward, philosophers have created divisions that put humanity in a special position relative to all other creatures. Neglecting a careful analysis of animal behavior in making these divisions does a disservice not only to the animals themselves, but also to humans. This thesis is an attempt to start pulling a thread of the discussion about the specialness of humans out for examination. Specifically, I examine the case of intentionality in the framework of the tool-related behaviors of crows and dolphins.
Master of Arts
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El, Siblani Ali. "Tool condition analysis and monitoring in cold rolling process." Thesis, KTH, Industriell produktion, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-41318.
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This research is about a costly problem in the automotive industry due to tool fracture during the splines cold rolling of steel shafts. The objective is to study the cause of this failure and propose solutions that can be implemented in the workshop.The writing starts with a brief introduction of the companies involved in shafts production and problem solving. It introduces the cold rolling process and its advantages on splines manufacturing, and it goes through relevant material and process characteristics that help to determine the cause of tool fracture.In order to understand the process failure and production flow, it has been necessary to build up an Ishikawa diagram with possible tool fracture causes. After collecting and analysing the data about the machine tool, cold rolling process and work-piece and rolling tool materials, tests and experiments have been done.It has been considered that there is a rolling tool fatigue that causes tool fracture. Beside tool fracture, two more problems with production flow instability and the right side rolling tool have been detected. Testing the material hardness of the work-piece has shown continuous hardness fluctuations from the supplier. Rolling tool misalignment has been measured by using a vernier caliper measurement device. Rolling tools material hardness analysis shows that tool is very hard and it is possible to use a tougher material which responds better to cyclic loads.Leax has tried to solve the problem by testing another lubrication and tool coatings. A modal analysis test has been performed in order to find the natural frequency of the work-piece which possibly may lead to vibration and over loading one of the rolling tools.The conclusion that has been reached is that main cause of fracture is rolling tool fatigue due to cyclic loads and it is important to use other rolling tool material. The other two detected problems, production flow instability and rigth side rolling tool fracture, should be considered as a part of the problem in order to significantly increase tools life and stabilize production flow rate.
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Dilner, David. "Behavior of cutting tool coating material Ti1-xAlxN at high pressure and high temperature." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-52773.
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The high pressure and high temperature (HPHT) behavior of Ti1-xAlxN coatings on cutting tool inserts have been of interest for this diploma work. A literature study of HPHT techniques as well as measurement methods has been done. A diamond anvil cell (DAC) would be a good device to achieve high pressure and high temperature conditions on small samples. Another way to obtain these conditions would be a cutting test, which has been performed on a Ti1-xAlxN coated cutting tool insert with x = 0.67. Also a cubic press could be used to apply HPHT on a Ti1-xAlxN sample or a large volume press on a whole cutting tool insert. To measure hardness on thin coatings a nanoindentor could be used, which have been done on heat-treated Ti0.33Al0.67N and TiN samples. X-ray diffraction (XRD) is a suitable method to measure phase composition of a sample and was performed on the cutting tested insert as well as on an untreated reference insert. Three ways to continue this project have been outlined all starting with more comprehensive cutting tests.
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Macêdo, Gabriel. "Material Transfer Mechanisms during Interaction of Aluminium Alloy and Tool Steel at Elevated Temperatures." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80118.
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Hot stamping of aluminium alloys allows for increased formability, decreased springback and the possibility of integrating age-hardening heat treatments into the process. However, it can be challenging due to the occurrence of material transfer of aluminium onto the tool, as aluminium is prone to adhesion even at low temperatures. Hence, lubrication is always necessary when forming aluminium, but lubricants can still fail, leading to direct interaction between tool and workpiece and thus material transfer. This phenomenon reduces the efficiency of the process, as interruptions are necessary for the refurbishment of the tools. Understanding of how material transfer takes place is important in order to find new or improved solutions, in terms of lubrication and surface engineering, to prevent adhesion. Nevertheless, current research in high temperature tribology of aluminium, mainly in terms of material transfer mechanisms, is very limited, as many of the works focus on lubricated conditions and do not look into the fundamental interactions between aluminium alloys and tool steels. In this context, the aim of this work is to investigate the mechanisms behind the occurrence of aluminium alloy transfer onto tool steel during sliding at high temperature and in dry conditions. A hot-strip drawing tribometer was used to perform tests at room temperature, 300°C, 400°C, and 500°C, directly after solubilizing the aluminium alloy at 520°C. Two different topographies for the tool steel were used: ground and polished. Material transfer characterization was performed mainly through scanning electron microscopy. It was found that grinding marks (ground tool steel) and carbides (polished tool steel) act as initiation sites for the transfer to occur. Temperature plays a role on the growth mechanisms of the transfer films during sliding, as thermal softening of the aluminium alloy is the dominant factor in determining the growth direction of the transfer layers. A growth towards the trailing edge (shearing and smearing of the transferred aluminium) or a growth towards the leading edge (build-up of transferred aluminium, leading to a thicker and more localized transfer material).
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Goetze, Paul Aaron. "A Comparative Study of 2024-T3 and 7075-T6 Aluminum Alloys Friction Stir Welded with Bobbin and Conventional Tools." Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1556807142415698.
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Dzwilewski, Andrzej. "Photo-polymerization as a tool for engineering the active material in organic field-effect transistors." Doctoral thesis, Umeå universitet, Fysik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-22127.
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The emergence of organic semiconductors is exciting since it promises to open up for straightforward and low-cost fabrication of a wide range of efficient and novel electronic devices. However, in order for this promise to become reality it is critical that new and functional fabrication techniques are developed. This thesis demonstrates the conceptualization, development, realization and implementation of a particularly straightforward and scalable fabrication process: the photo-induced and resist-free imprint patterning technique.Initial experiments revealed that some members of a group of carbon-cage molecular semiconductors – termed fullerenes – can be photochemically modified into dimeric or polymeric structures during exposure to laser light, and, importantly, that the exposed fullerene material retains its good electron-transport property while its solubility in common organic solvents is drastically lowered. With this information at hand, it was possible to design and create well-defined patterns in a solution-deposited fullerene film by exposing selected film areas to laser light and then developing the entire film in a tuned developer solution. An electronically active fullerene pattern emerges at the locations defined by the incident laser beam, and the patterning technique was successfully utilized for the fabrication of arrays of efficient field-effect transistors.In a later stage, the capacity of the photo-induced and resist-free imprint technique was demonstrated to encompass the fabrication of ubiquitous and useful CMOS circuits. These are based on a combination of p-type and n-type transistors, and a blend between a p-type organic semiconductor and an n-type fullerene compound was designed so that the latter dominated. By solution-depositing the blend film on an array of transistor structures, exposing selected transistors to laser light, and then developing the entire transistor array in a developer solution, it was possible to establish a desired combination of (non-exposed) p-type transistors and (exposed) n-type transistors. We finally utilized this combination of transistors for the fabrication of a CMOS circuit in the form of well a-functional organic inverter stage.
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Fiorini, Karl. "The Fibonacci series as a means of organising musical material: A composer’s tool or constraint?" Thesis, Royal College of Music, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.657031.
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McGrew, William Clement. "Chimpanzee material culture : implications for human evolution." Thesis, University of Stirling, 1990. http://hdl.handle.net/1893/2016.
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The chimpanzee (Pan troglodytes, Pongidae) among all other living species, is our closest relation, with whom we last shared a common ancestor less than five million years ago. These African apes make and use a rich and varied kit of tools. Of the primates, and even of the other Great Apes, they are the only consistent and habitual tool-users. Chimpanzees meet the criteria of working definitions of culture as originally devised for human beings in socio-cultural anthropology. They show sex differences in using tools to obtain and to process a variety of plant and animal foods. The technological gap between chimpanzees and human societies living by foraging (hunter-gatherers) is surprisingly narrow, at least for food-getting. Different communities of chimpanzees have different tool-kits, and not all of this regional and local variation can be explained by the varied physical and biotic environments in which they live. Some differences are likely customs based on non-functionally derived and symbolically encoded traditions. Chimpanzees serve as heuristic, referential models for the reconstruction of cultural evolution in apes and humans from an ancestral hominoid. However, chimpanzees are not humans, and key differences exist between them, though many of these apparent contrasts remain to be explored empirically and theoretically.
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Ersvik, Erik, and Roj Khalid. "Milling in hardened steel - a study of tool wear in conventional- and dynamic milling." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-255646.
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Milling is a commonly used machining process where a rotating cutter removes material from the workpiece. In recent years, attention has been turned towards so called dynamic milling methods which differ from the conventional way of milling. Dynamic milling normally uses, as opposed to the conventional way, more of the axial cutting edge, smaller radial depth of cut, significantly higher cutting speed and feed per tooth. The method has demonstrated potential to save both time and money under specific circumstances, for manufacturing companies.This thesis was conducted at ISCAR Sverige AB in Uppsala, Sweden. ISCAR Metalworking is a full service supplier of carbide cutting tools. The objective is to establish if there are benefits with dynamic milling methods with regard to material removal rate and lifetime of the tool by experimentally investigating and comparing tool wear that occur with conventional- and dynamic milling methods in hardened steels. Tools used were ISCAR’s MULTI-MASTER end mills, MM A and MM B, and the hardened steels were Hardox 600 and Dievar. Analysis was performed by using a USB-microscope, scanning electron microscope (SEM) and a Wyko-profilometer. The results of this study show that dynamic milling parameters can give several benefits regarding tool life and material removal rate. When machining in Hardox 600 and Dievar, both end mills were able to achieve a higher material removal rate and lifetime with dynamic parameters compared to more conventional ones. MM A outperformed MM B in Dievar, but the results were reversed in Hardox, MM B performed better. Results from the profilometry analysis showed that in Dievar, the dynamic parameters generated a smoother surface while the surface results from Hardox were more equivocal. The main conclusion was that milling with dynamic parameters is generally more advantageous and should be utilised, if possible.
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Jakrawatana, Napat Civil & Environmental Engineering Faculty of Engineering UNSW. "An integrated decision support tool for more sustainable management of biomass resources in agricultural regions." Awarded By:University of New South Wales. Civil & Environmental Engineering, 2009. http://handle.unsw.edu.au/1959.4/44547.
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Agriculture currently faces a number of environmental sustainability issues. Three key issues that are the focus of this study are greenhouse gas emissions, depletion of mineral phosphorus resources and cadmium contamination in agricultural soil. Biomass can potentially be used as a renewable energy source and can also be returned to improve the nutrient and drainage structure of agricultural soils. Sustainable management of biomass and agriculture can have significant impacts on reducing greenhouse gas emissions from a region. Moreover, it reduces the demand for external energy supply, phosphorous (P) based fertilizer, and it??s associated Cadmium (Cd) impurity which can contaminate the soil, plant and food chains. These three issues have typically been considered separately, and managed by different agencies or organisations. The aim of this thesis is to develop an integrated decision support tool that can be used for evaluating alternative options for management and resource recovery from biomass for enhancing recovery of energy, returning carbon (C) and phosphorus (P) from biomass back to soil, reducing greenhouse gas emissions and also cadmium (Cd) contamination in an agricultural region. This research employed a combination of the tools of Material Flow Analysis (MFA), Geographic Information System (GIS) and Cost-Benefit Analysis (CBA). MFA is used as the primary tool for this research. GIS and CBA are combined with MFA in later stages of the overall procedure to develop an integrated decision support tool. This integrated tool has been applied to the Murrumbidgee Irrigation Area (MIA) in Australia. Tracking the flow of essential substances using MFA has identified current resource management efficiency and substances accumulation across the region. Integrating a spatial analysis tool (GIS) with MFA has provided a feedback driven monitoring tool for evaluating trends of spatial accumulation of substances on agricultural land. This enables the time remaining before acceptable limits are exceeded to be estimated on a spatial basis. Integrated MFA and CBA has been applied to evaluate the tradeoffs and potential synergies of alternative biomass management options. Overall the tool can assist in evaluating the effectiveness of alternative scenarios and visualise the results to stakeholders in a systematic way.
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Guntoro, Pratama Istiadi. "X-ray microcomputed tomography (µCT) as a potential tool in Geometallurgy." Licentiate thesis, Luleå tekniska universitet, Mineralteknik och metallurgi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76576.
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In recent years, automated mineralogy has become an essential tool in geometallurgy. Automated mineralogical tools allow the acquisition of mineralogical and liberation data of ore particles in a sample. These particle data can then be used further for particle-based mineral processing simulation in the context of geometallurgy. However, most automated mineralogical tools currently in application are based on two-dimensional (2D) microscopy analysis, which are subject to stereological error when analyzing three-dimensional(3D) object such as ore particles. Recent advancements in X-ray microcomputed tomography (µCT) have indicated great potential of such system to be the next automated mineralogical tool. µCT's main advantage lies on its ability in monitoring 3D internal structure of the ore at resolutions down to few microns, eliminating stereological error obtained from 2D analysis. Aided with the continuous developments of computing capability of 3D data, it is only the question of time that µCT system becomes an interesting alternative in automated mineralogy system. This study aims to evaluate the potential of implementing µCT as an automated mineralogical tool in the context of geometallurgy. First, a brief introduction about the role of automated mineralogy in geometallurgy is presented. Then, the development of µCT system to become an automated mineralogical tool in the context of geometallurgy andprocess mineralogy is discussed (Paper 1). The discussion also reviews the available data analysis methods in extracting ore properties (size, mineralogy, texture) from the 3D µCT image (Paper 2). Based on the review, it was found that the main challenge inperforming µCT analysis of ore samples is the difficulties associated to the segmentation of the mineral phases in the dataset. This challenge is adressed through the implementation of machine learning techniques using Scanning Electron Microscope (SEM) data as a reference to differentiate the mineral phases in the µCT dataset (Paper 3).
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Wang, Jun. "Material removal sequence optimization for reducing workpiece deformation during thin-wall machining." Kyoto University, 2020. http://hdl.handle.net/2433/253274.
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Bergman, Lars. "Creating an Appealing 3D-visualization Tool for Baseboards in the Web Browser." Thesis, Linköpings universitet, Medie- och Informationsteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-168456.
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Today a lot of libraries, tools and techniques exist to create visual appealing renders for the web. In this thesis, a prototype for visualizing baseboards in the web browser was developed. The prototype demonstrates how certain libraries and techniques were used in order to achieve a generalized, appealing and realistic visualization of the baseboards in a 3D-visualization. This paper also covers why certain libraries and techniques were used for this prototype. The resulting prototype, use Three.js and takes advantage of PBR, different mapping methods and lighting sources that can be changed during runtime through a GUI. To get results on different aspects, such as the visual appeal, how realistic, and what lighting sources worked best for the prototype, a web-survey was sent out and the results evaluated. The evaluation showed that the usage of PBR, a roughness-metalness workflow, environment mapping, physical correct lighting and a point light solution in Three.js all made a good job in creating an appealing, generalized and realistic visualization tool for the web.
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Babu, Sailesh. "A material based approach to creating wear resistant surfaces for hot forging." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1101836555.
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Thesis (Ph. D.)--Ohio State University, 2004.Title from first page of PDF file. Document formatted into pages; contains xxii, 185 p.; also includes graphics (some col.). Includes bibliographical references (p. 178-185).
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Jubica, Jubica. "Characterization of Secondary Carbides in Low-Alloyed Martensitic Model Alloy Tool Steels." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284449.
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The development of tool steels for making and shaping other materials requires a better understanding of the material's properties during manufacture. These high-quality steels include many alloying elements, which give increased hardness during tempering. For producing hardened microstructures, austenite generation is essential. The martensite formed by rapid quenching of austenite followed by tempering helps develop high strength steels. Studying carbide precipitation is a challenge as they are very small in size, present only in small volume fractions and high number densities. The carbide reactions are complicated due to so-called metastable carbides, which are only present as part of the precipitation process. This work focuses on model alloys with two main elements in addition to iron and carbon, molybdenum, and vanadium, to clarify and simplify the carbide characterization. This is done to determine the effect of molybdenum and vanadium carbides on the overall hardness. In this work, two model alloys, A and B, are tempered at 550°C and 600°C with the same vanadium content but different molybdenum contents. The hardness of the materials is evaluated and compared at these temperatures. A more detailed characterization work is done for material A with Scanning Transmission Electron Microscopy-Energy Dispersive Spectroscopy (STEM-EDS) to understand the microstructure and analyze the precipitates. Simulations are performed with Thermo-Calc Prisma (TC-Prisma) to support the experimental work, which includes the simulation of the secondary carbide precipitation, mainly molybdenum carbides in material A tempered for 24h at 600°C, and predicts the carbide precipitation behavior in this steel. The results from STEM-EDS and TC-Prisma for material A, show that the small secondary carbides in the martensite contribute to the increased strength of material A. Due to the overaging of the carbides at 600°C, the hardness at 550°C is higher than at 600°C for material A. The given thesis work is an attempt to interpret the development of secondary carbides of Mo and V in the martensitic matrix and their role in the overall hardness.Den ständiga utvecklingen av högpresterande stål för transport, konstruktion och energisektorn kräver bättre förståelse för materialets egenskaper vid tillverkning. Dessa martensitiska stål inkluderar många legeringselement vilket ger ökad hårdhet vid härdning och anlöpning. Att studera utskiljning av karbider är en utmaning eftersom de är närvarande endast i liten volymsfraktion. Karbidreaktionerna är komplexa till följd av så kallade metastabila karbider vilka endast är närvarande vid en del av utskiljningsförloppet. För att tydliggöra och förenkla karbidkarakteriseringen fokuserar detta arbete på modellegeringar med två huvudelement utöver järn och kol, molybden och vanadin. Detta görs för att fastställa effekten av molybden och vanadinkarbider på den totala hårdheten. I detta arbete studeras två modellegeringar, A och B, härdade och anlöpta vid 550 °C och 600 °C med samma vanadininnehåll men olika molybdeninnehåll. Materialens hårdhet utvärderas och jämförs vid dessa temperaturer. Ett mer detaljerat karaktäriseringsarbete görs för material A med hjälp av STEM-EDS för att förstå mikrostrukturen och analysera utskiljningarna. Simuleringar görs med TC-PRISMA för att stödja det experimentella arbetet, vilket inkluderar simulering av den sekundära karbidutskiljningen och predikterar karbidstrukturen i dessa stål. Resultaten visar att de små sekundärkarbiderna i martensiten bidrar till den ökade styrkan hos material A. Hårdheten vid 550 °C är högre än vid 600 °C för material A eftersom både utskiljningen av karbider är sker långsammare och även dislokationsåterhämtning.
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Varhaník, Matúš. "Obrábění těžkoobrobitelných materiálů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-379004.
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General perspective of this diploma thesis was aimed at machining of hard-to-machine materials. Theoretical part contains division and specification of these types of materials. Ways of classification and evaluation were also listed. Causes of worsened machinability were defined with the design of possible technological solutions, which eliminates these features. The main target of experimental part was turning nickel-based superalloy Inconel® 718 with the purpose of increase process productivity. Knowledge about appropriate types of cutting tool material and his coating were necessary for process optimization. It was achieved by replacing reference cutting tool material (coated carbide inserts) with SiAlON ceramic. Cutting tool edge was tested with an intention to discover appropriate deal between tool life and volume of material removed. Measured cutting forces, generated by machining of reference and optimize technology, were processed by using simulation software. Total deformation of workpiece material was statistically evaluated. The conclusion of diploma thesis is technical-economic evaluation of both options.
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Saleem, Jason Jamil. "Quantifying the Participatory Ergonomic Effects of Training and a Work Analysis Tool on Operator Performance and Well-Being." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/35856.
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Participatory ergonomics (PE) is a macroergonomics approach in which the end-users actively participate in developing and implementing the technology. PE can be an effective method for involving front-line workers in analyzing and redesigning their own jobs. PE can be used at the macro-level, the micro-level, or somewhere in between. At the macro-level, the focus of the PE program is across an entire organization or work system. At the micro-level, the focus of a PE approach is on a particular task, workstation, or product. A major benefit for using PE is that workers are more likely to accept changes to their job if they participate in the redesign. Furthermore, workers' motivation, job satisfaction, and knowledge are enhanced through the participatory process.
There are many case studies that describe successful PE approaches. These studies, however, lack a control group or comparison group and so changes in the workplace (e.g., a reduction of musculoskeletal injury) cannot be attributed directly to the interventions resulting from the PE program with certainty. Quantifying the effects of PE is difficult because of problems in trying to isolate variables. Confounding variables are often difficult to contain. This study quantified some of the effects of PE by utilizing a controlled experimental design in the laboratory in which participants analyzed and redesigned a manual material handling job. The effects of this PE approach were quantified by measuring a reduction of risk factors associated with the job and by measuring a lift index of the lifting task that indicates a risk for injury.
Many authors state or infer that some degree of ergonomics training should be given to the participants in a PE approach. However, the effects of providing ergonomics training to participants in these types of participatory approaches are unclear. This research evaluates the effects of providing the participants with basic ergonomics instruction relevant to the job being evaluated and redesigned. Also, this research suggests if the NIOSH lifting equation can be an effective tool in a participatory ergonomics approach in the redesign of a manual material handling job that involves lifting tasks. A 2-factor, between-subjects design was used.
Participants consisted of 32 volunteers (16 males and 16 females). Only individuals that have had no prior ergonomics knowledge were considered for the subject pool. Participants performed a simulated manual material handling job in the laboratory. After performing the job, some subjects were given ergonomics training and/or instructed on how to use the NIOSH lifting equation for manual lifting tasks. The participants were then asked to redesign the original job. The participants' redesigns were compared to the redesigns of the control subjects (who received no ergonomics instruction and did not use the NIOSH lifting equation).
The subjects who received the ergonomics instruction identified significantly more risk factors in the original job and eliminated significantly more risk factors in the redesign than the control subjects. The subjects who learned and used the NIOSH lifting equation also identified significantly more risk factors in the original job but did not eliminate significantly more risk factors in the redesign. The subjects who received the ergonomics instruction and who used the NIOSH lifting equation were not shown to have an advantage over the subjects who received the ergonomics instruction alone. The group that received the ergonomics training performed optimally with respect to the other experimental groups. Implications for participatory ergonomics approaches are discussed.Master of Science
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Волошко, О. В., and С. П. Вислоух. "Методика визначення оброблюваності конструкційних матеріалів "неруйнівними" методами." Thesis, Видавництво СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/11278.
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Mastroianni, Benjamin, and Oliver Babic. "ElectroFlex : Concept design of a tool lanyard with integrated power cable." Thesis, Jönköping University, JTH, Konstruktion och produktutveckling, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-51321.
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For a company that focuses on the use of battery power, the integration into fossil fuel dominated markets can be challenging. In order to help with integration into new markets, Globe Group AB are developing job-essential accessories that are compatible with their tools and batteries. The purpose of the work done in this thesis was to develop a concept for a tool lanyard with an integrated electrical cable that is compatible with Globe Group AB’s current line of power tools. During this project it was decided that the research and testing would be conducted and analyzed based off high altitude tree work done by arborists. This thesis focuses on the evaluation of research and testing to aid in concept design. A large focus was laid on the implementation of physical testing into early research and development stages, in an attempt to increase the validity of design decisions. The project was carried out by doing preliminary research and testing in order to gain information and metrics that could be used in the concept and prototype design stages. The prototypes were tested and compared to data collected prior in the project, to make statements about the feasibility of the concept and it’s included features. The result of this project was a final concept that includes all features that were deemed necessary through research and testing, a physical prototype, and test data to offer proof of concept.
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Axin, Kajsa, and Camilla Jonzon. "Resource planning for internal logistics : A tool designed for the material handling department at Scania Axles and Gearboxes." Thesis, Linköpings universitet, Logistik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-78522.
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This master thesis is performed at Scania Axles and Gearboxes, a production plant located in Södertälje. Within the plant axles, gearboxes as well as central gears are assembled from components to finished products. All production is conducted on production lines, with a pre-determined rate, which is supplied with components by the material handling department. Since the production quantity and the mix of product variants produced on the production line is customer order-based, the number and type of components needed for production as well as appropriate staffing within the material handling department is difficult to predict. Scania is currently using a number of different resource planning tools for each material handling-department within Axles and Gearboxes to visualize the workload within the departments. These systems however have different structure and are all not sufficiently updated, which means that they cannot fulfill their intended purpose. The aim for this thesis is to develop a common tool for the whole department of Axles and Gearboxes which can visualize the amount workload that prevails. This tool should also be able to account for varying production conditions. The resource planning tool which has been developed within this project is built upon the basis of a structure for occupancy calculation on a position, which includes the premise that a working position contains a number of operations to be performed a certain number of times during a given a number of working hours. The amount workload within a working position is calculated as the ratio how long an operation takes to perform, the number of times the task needs to be performed and during what amount of time it has to be done. The structure of the tool takes into account the following conditions; production quantity, production rate, volume of incoming and outgoing goods and the mix of product variants assembled on the production line. Based on the structure of the occupancy calculation for the material handling department, an additional study has been made to evaluate how the above listed conditions of production affects the occupancy, and to what degree. This study has been conducted using both qualitative and quantitative information obtained from both interviews and historical data extracts. After this data collection, the resource planning tool has been built in Microsoft Excel. The developed resource planning tool enables a visualization of the total amount of workload within a working position in the form of a percentage which shows the proportion of working time used during a shift. That percentage presented in the tool varies thereafter when changing any of the above mentioned production conditions. By the end of the thesis, a number of working positions from the department of Axles and Gearboxes has been imported to the resource planning tool to be able to make appropriate testing and sensitivity analysis of the result. The task that Scania has yet to perform before they can use the tool for the whole department is to continue with the work of importing remaining working positions. The developed resource planning system and the result of this master thesis is a dynamic tool which Scania can use to predict the need of resources in the material handling department for future changes in production conditions, such as time reductions, increased demand for products or changes in work routines.
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Park, Jung-Kyu. "Advanced Development of a Smart Material Design, Modeling, and Selection Tool with an Emphasis on Liquid Crystal Elastomers." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354653154.
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Hrabina, Martin. "Renovace nástrojových ocelí pro tváření za studena." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231113.
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Master’s thesis “Revovation of tools steels for cold forming“ characterizes wear resistant welds for tool steels. The thesis is dividend into two main chapters. The first chapter of the thesis is focused on the theory of wear for cold work steels. The theory is combined with an experimental chapter. The experimental part describes particular materials and technology for welding. The conclusion of the thesis is evaluated results of test for mentioned technology and welding conditions.
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Durdu, Levent. "Web-based Learning Tool: Design And Development Of An Online Basic English Support Material For Young Children At Elementary Level." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1063395/index.pdf.
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This study investigated the students’
and teacher&
#8217
s perception of a web-based learning tool for an English course which was given as a second language at elementary level. The site was used as a supplementary material for 8th grade students in METU College. The researcher developed the site specifically for this study and in the development process internet and database technologies were used.The data were collected from the 22, 8th grade students through a computer attitude scale and a questionnaire, which was developed by the researcher. An interview with the course teacher was conducted. Descriptive statistics, frequency distributions and researcher observation were used to express the results of the study. The results showed that the site was perceived positively by more than half of the students in terms of vocabulary learning through the dictionary and activities page. The site was evaluated by the students and nearly most of the students found the site to be useful in terms of acquiring hearsay through the dictionary and the chat page of the site. More than half of the students perceived the chat environment more suitable for communication than classroom environment. The course teacher evaluated the site to be useful in terms of vocabulary learning, hearsay and online communication.
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Brown, Hannah-Molly. "How is craft a tool for humbling and empowering humanity? : An investigation into learning, and empathy building through material relationships." Thesis, Konstfack, Textil, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-7801.
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Our value of people and craft are linked. With the rise of fast production industry, and the lack of transparency when it comes to a role of consumption, we have become detached from making processes. This detachment is detrimental to our understanding and empathy for other people but also to ourselves. It perpetuates disposable ways of living and keeps us reliant on disposable consumption. Craft is an undervalued tool which can be utilised in historical learning as well as anthropological study today. In doing so, we are able to understand more about humanity by inspecting craft through the ‘three facet’ lens. We are then able to develop empathy for other people and other cultures, through the non- tangible space created during the process of crafting. For those who do craft, this recognition is empowering and enables cultural ownership. It also empowers us as individuals, when we are able to produce something ourselves and physically see the learning process. This means we can recognise who has made our objects, and appreciate the time, skill and commitment which goes into the undertaking. This encourages us to appreciate objects, to consider our ways of living and move away from disposable consumption. Through a comparison of the relationship to craft that is held in Peru, with that of the relationship we hold in the UK, and broadened by my experience living and teaching in Sweden, I conclude that industrialisation and colonialism has a role to play, but ultimately, the power and potential of craft, is physically in our own hands. I propose using the ‘three facets’; Utility, Aesthetics and Connectivity, as a way to break down the information documented through craft, to analyse, at a deep level, what can be gained from craft appreciation.
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Inanloo, Bahareh. "A Multi-Criteria GIS-Based Route Selection Tool for Hazardous Material Transport: Consideration of Environmental Consequence, Traffic Congestions and Costs." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/2262.
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Hazardous materials are substances that, if not regulated, can pose a threat to human populations and their environmental health, safety or property when transported in commerce. About 1.5 million tons of hazardous material shipments are transported by truck in the US annually, with a steady increase of approximately 5% per year.
The objective of this study was to develop a routing tool for hazardous material transport in order to facilitate reduced environmental impacts and less transportation difficulties, yet would also find paths that were still compelling for the shipping carriers as a matter of trucking cost. The study started with identification of inhalation hazard impact zones and explosion protective areas around the location of hypothetical hazardous material releases, considering different parameters (i.e., chemicals characteristics, release quantities, atmospheric condition, etc.). Results showed that depending on the quantity of release, chemical, and atmospheric stability (a function of wind speed, meteorology, sky cover, time and location of accidents, etc.) the consequence of these incidents can differ. The study was extended by selection of other evaluation criteria for further investigation because health risk as an evaluation criterion would not be the only concern in selection of routes. Transportation difficulties (i.e., road blockage and congestion) were incorporated as important factor due to their indirect impact/cost on the users of transportation networks. Trucking costs were also considered as one of the primary criteria in selection of hazardous material paths; otherwise the suggested routes would have not been convincing for the shipping companies. The last but not least criterion was proximity of public places to the routes.
The approach evolved from a simple framework to a complicated and efficient GIS-based tool able to investigate transportation networks of any given study area, and capable of generating best routing options for cargos. The suggested tool uses a multi-criteria-decision-making method, which considers the priorities of the decision makers in choosing the cargo routes.
Comparison of the routing options based on each criterion and also the overall suitableness of the path in regards to all the criteria (using a multi-criteria-decision-making method) showed that using similar tools as the one proposed by this study can provide decision makers insights in the area of hazardous material transport. This tool shows the probable consequences of considering each path in a very easily understandable way; in the formats of maps and tables, which makes the tradeoffs of costs and risks considerably simpler, as in some cases slightly compromising on trucking cost may drastically decrease the probable health risk and/or traffic difficulties. This will not only be rewarding to the community by making cities safer places to live, but also can be beneficial to shipping companies by allowing them to advertise as environmental friendly conveyors.
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Zabala, Mejia Andres Oswaldo. "Developing a grading tool for sustainable design of structural systems in buildings." Thesis, Linköpings universitet, Industriell miljöteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-177388.
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Construction is known for consuming large quantities of raw materials and high amounts of energy. In 2018, the construction industry was responsible for 6% of global energy consumption, 11% of global CO2 emissions, and approximately 36% of the total waste in the European Union. These drawbacks are just a part of the gap between the construction sector and Sustainability, which can also be perceived as challenges to the industry and demands for new and innovative strategies to increase Sustainability. For example, recent efforts of EcoDesign on structural systems show a trend in the importance of materials efficiency, durability, adaptability, and reuse. This thesis aims to create a set of guidelines that will help designers and other construction stakeholders apply Design for Deconstruction and Adaptability DfD/A principles to increase the knowledge of how structural design and structural systems in buildings can be designed to promote Sustainability. For this purpose, a grading tool to assess structural systems based on the ISO 20887 was developed. The general methodology for this research was adapted from Design Research Methodology with a particular focus on the Product Development approach for the tool development. A literature Review was conducted in both scientific and grey literature to identify relevant information and current efforts on sustainable design of structural systems and application of DfD/A principles on the construction sector. Three additional methods for data collection were used: (1) questionnaire for identification of customer needs and expectations, (2) benchmarking to identify similar tools, strategies, and certifications systems that include sustainability performance in buildings; and (3) workshops with the purpose to rate the usefulness quality of the tool based on the application of the tool by potential users in different case studies. A ready-to-use computer-based EcoDesign tool was developed. The assessment performed by this tool consists of an indicator system of DfD/A strategies to enhance sustainable development by improving material efficiency and stimulate a circular economy in the construction sector. A top-down approach was used for the concept generation, which starts with the ReBuilding Index as an indicator of sustainable performance for structural systems. This index is based on five categories defined on the relationship of the DfD/A principles with the design process of the structural system. A total of 20 principles are distributed in these categories, defined by 54 strategies to reach the goal of the principles. The tool was tested by 11 potential users with different roles in the construction sector. Five case studies were selected to grade the design of five different typologies of structural systems. The usefulness quality of the tool was evaluated based on indicators of usability, utility, and user experience. It was found that developing the tool based on DfD/A principles and the ISO 20887 gave the tool a solid theoretical background and a flexible structure that can be used for sustainable design or as part of an extensive framework of certification systems or ecolabel programs. The tool accomplishes the goal of grading and helping to improve the structural design. However, during the evaluation of the tool, many barriers and difficulties of application were found. Therefore, these findings and obstacles are instead identified as challenges and turn them into opportunities for improvements in future versions of the tool.InFutUReWood project
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Van, Schoor Jan Cornelius Rudolph. "Evaluation of the batch press as a laboratory tool to simulate high and medium-pressure roller crushers." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/37315.
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High and medium-pressure roller crushers operate on the principle of inter-particle crushing by crushing material in a packed bed. Although reference in the study is made to high-pressure roller crushers, the work was done with medium–pressure roller crushers i.e. the Loesche mill and the Horomill. The difference in pressures between these equipment and high-pressure grinding rolls (HPGR) from measurements done by FCB, the supplier of the Horomill, was that the medium-pressure equipment operates at pressures of 30 MPa whilst the HPGR operates at pressures as high as 100 MPa. In this study, the differences between single particle and inter-particle crushing and the applicability of the batch press to predict the energy consumption and particle size distributions for medium-pressure roller crushers were investigated. Two phases of crushing were identified and investigated. The first phase occurs when the material is still being drawn into the gap between the rollers. The second phase, called packed bed crushing, occurs when the material is in the gap between the rollers. Crushing and milling energy requirements are discussed with specific reference to the energy models proposed by Bond and Rittinger along with the shortcomings of both these models. These models postulate that the comminution energy is an inverse function of product size. This is proven to be true in this study, but where certain constants are suggested in the aforementioned correlations, this study revealed that these constants are not fixed for all applications but varies for different types of ore. The results were determined for 80% as well as 50% mass passing size. Kick proposed that the energy requirements are a function of the reduction ratio. A model used for roller crushers that is similar to what Kick proposed was also investigated. This was also found to be valid but again, the coefficients in the model vary for the different materials. A new method for predicting the work index of an ore for inter-particle crushing was investigated, which involves using a piston press in which a bed of material is pressed to a predetermined pressure. The proposed method was evaluated using pilot test data obtained with a Horomill, as well as with a pilot Loesche mill. The results indicate that the correlation between the batch press and the pilot mills are poor. The Rosin-Rammler description for particle size distribution was applied and compared with other descriptions. The particle size descriptions of products from the batch press and pilot mills were compared and although there are differences, the batch press can be used to prepare material for initial research in a project. From this study it is clear that, especially when tests are done on an unknown ore body, a work index such as Bond’s, cannot be used for plant design and economic studies unless some pilot plant tests are done to confirm the relationship between energy consumed and product size.Dissertation (MEng)--University of Pretoria, 2012.
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Materials Science and Metallurgical Engineering
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White, Gregory William. "An investigation of the Australian layered elastic tool for flexible aircraft pavement thickness design." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16663/.
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APSDS is a layered elastic tool for aircraft pavement thickness determination developed and distributed by Mincad Systems and based on the sister software Circly. As aircraft pavement thickness determination remains an empirical science, mechanistic-empirical design tools such as APSDS require calibration to full scale pavement performance, via the S77-1 curve. APSDS provides the unique advantage over other tools that it models all the aircraft in all their wandering positions, negating the need for designers to use pass to cover ratios and acknowledging that different aircraft have their wheels located at difference distances from the aircraft centerline. APSDS requires a range of input parameters to be entered, including subgrade modulus, aircraft types, masses and passes and a pavement structure. A pavement thickness is then returned which has 50% design reliability. Greater levels of reliability are obtained by conservative selection of input values. Whilst most input parameters have a linear influence on pavement thickness, subgrade modulus changes have a greater influence at lower values and less influence at higher values. When selecting input values, designers should concentrate their efforts on subgrade modulus and aircraft mass as these have the greatest influence on the required pavement thickness. Presumptive or standard values are generally acceptable for the less influential parameters. S77-1 pavement thicknesses are of a standard composition with only the subbase thickness varying. Non-standard pavement structures are determined using the principle of material equivalence and the FAA provides range of material equivalence factors, of which the mid-range values are most commonly used. APSDS allows direct modelling of non-standard pavement structures. By comparing different APSDS pavements of equal structural capacity, implied material equivalences can be calculated. These APSDS implied material equivalences lie at the lower end of the ranges published by FAA. In order to obtain consistence between APSDS and the FAA guidance, the following material equivalence values are recommended: * Asphalt for Crushed Rock. 1.3. * Crushed Rock for Uncrushed Gravel. 1.2. * Asphalt for Uncrushed Gravel. 1.6. Proof rolling regimes remain an important part of the design and construction of flexible aircraft pavements. Historically, designers relied on Bousinesq's equation and the assumption of point loads on semi-finite homogenous materials to determine proof rolling regimes using stress as the indicator of damage. The ability of APSDS to generate stress, strain and deflection at any depth and any location across the pavement allows these historical assumptions to be tested. As the design of a proof rolling regime is one of comparing damage indicators modelled under aircraft loads to those under heavy roller loads, the historical simplifications are generally valid for practical design scenarios. Where project specific data is required, APSDS can readily calculate stresses induced by proof rollers and aircraft at any location and depth for comparison. APSDS is a leading tool for flexible aircraft pavement thickness determination due to its flexibility, transparency and being free from bias. However, the following possible areas for improvement are considered worthy of future research and development: * Improvements to the user interface. * Ability to model aircraft masses as frequency distributions. * Ability to copy stress with depth data to Excel(tm) spreadsheets. * Ability to perform parametric runs. * Inclusion of a reliability based design module.
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Agarwal, Pawan. "The design and empirical evaluation of a chemical process visualization tool to help introductory chemical engineering students solve material balance problems." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Summer2009/p_agarwal_072409.pdf.
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Thesis (M.S. in computer science)--Washington State University, August 2009.Title from PDF title page (viewed on Sept. 15, 2009). "School of Electrical Engineering and Computer Science." Includes bibliographical references (p. 71-74).
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Nilsson, Hultén Leo. "Nitrogen Without Oxygen : The effect of ferroalloys added after vacuum treatment on cleanliness of nitrogen-alloyed tool steel." Thesis, KTH, Materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298093.
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Nitrogen-alloyed tool steel is made at Uddeholms AB by adding high-nitrogen ferroalloy after vacuum degassing where introduced impurities are hard to remove. In this thesis two types of high-nitrogen ferrochromium are compared, a solid version and a powder cored wire. They are examined in crossection and 16 samples from four charges are examined with Pulse Distribution Analysis as well as systematic microscopy of polished cross sections. The PDA results missed smaller spinel inclusions shown in previous research to be detrimental. The wire form shows promise but more charges need to be evaluated before a conclusion is drawn.Kvävelegerat verktygsstål tillverkas hos Uddeholms AB genom tillsats av kväverika ferrolegeringar efter vakumavgasning, och orenheter som introduceras i detta steg är svåra att avskilja. I den har uppsatsen jämförs två typer av kväverikt ferrokrom varav en i form av stycken och en i form av tråd med pulverkärna. De undersöks i tvärsnitt och totalt 16 prov från fyra charger undersöks med PDA (pulsfördelningsanalys) och systematisk mikroskopering i tvärsnitt. Resultaten från PDA missade mindre inneslutningar av spinell vilka tidigare har visat sig problematiska. Trådformen verkar lovande men fler charger behöver undersökas för att kunna dra en definitiv slutsats.
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Kaminise, Almir Kazuo. "Estudo da influência do material do porta-ferramenta sobre temperaturas de usinagem no torneamento." Universidade Federal de Uberlândia, 2012. https://repositorio.ufu.br/handle/123456789/14725.
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Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorThe main objective of this work is the experimental investigation of the effect that the material of the toolholder has on the temperature at tool-chip interface and on the surface temperatures of the cutting tool and toolholder. The study was conducted in dry turning of gray iron with uncoated cemented carbide inserts, using the same cutting parameters. Five toolholders had been confectioned in materials having different thermal conductivity, these being: copper, brass, aluminum, stainless steel and titanium alloy. The toolholders are identical and have the constructive aspects obtained from a commercial toolholder for turning that material. The temperature at the tool-chip interface was measured using the toolworkpiece thermocouple method and the surface temperatures in the tools and the toolholders, by conventional type T thermocouples. The system was modified in order to develop an experimental procedure for the physical compensating of the secondary and parasites thermoelectric signals (emf). Also, modifications was carried out in a conventional tailstock for use in driving the emf signal between the workpiece and a stationary conductor, but without significantly altering the stiffness of the system. The tailstock was electric insulated and a mercury bearing was mounted inside it and their internal connections were turned in reference junctions at room temperature because on otherwise it could act as secondary junctions. The calibration of the tool-workpiece thermocouple was developed in the same experimental apparatus using the modifications implemented in this system. Besides the results obtained with the investigation of the effects of the toolholder material on the surface temperatures of the tool and the tool holder and on the tool-chip interface temperature, this research also presents contributions to the use and performance of the tool-workpiece thermocouple method.
O objetivo principal deste trabalho é a investigação experimental do efeito que o material do porta-ferramenta exerce sobre a temperatura na interface ferramenta/cavaco e sobre as temperaturas superficiais da ferramenta de corte e do próprio porta-ferramenta. O estudo foi desenvolvido com a operação de torneamento cilíndrico externo de ferro fundido cinzento, a seco, com insertos de metal duro, em parâmetros de corte fixos. Cinco portas-ferramentas foram confeccionados em materiais com condutividades térmicas diferentes, sendo esses: cobre, latão, alumínio, aço inoxidável e liga de titânio. Os portas-ferramentas são geometricamente idênticos e têm as características construtivas de um porta-ferramenta comercial próprio ao torneamento daquele material. Mediu-se a temperatura na interface ferramenta/cavaco usando o método do termopar ferramenta-peça e as temperaturas superficiais na ferramenta e nos suportes, por meio de termopares convencionais do tipo T. O sistema termopar ferramenta-peça foi modificado no sentido de se desenvolver um procedimento experimental para a compensação física de forças eletromotrizes secundárias e parasitas. Destaca-se a execução de modificações em uma contra ponta rotativa convencional para o seu uso na condução do sinal da força eletromotriz entre a peça e um condutor estacionário sem, contudo, alterar significativamente a sua rigidez na fixação da peça. Nessas modificações, aplicou-se uma isolação elétrica permanente, implantou-se um mancal de mercúrio no seu interior e promoveu-se mudanças nas suas conexões internas, que poderiam agir como junções secundárias, transformando-as em junções de referência à temperatura ambiente. A calibração do sistema termopar ferramenta-peça foi desenvolvida sobre o próprio aparato experimental usando as modificações implantadas nesse sistema. Os resultados obtidos no trabalho mostram que os materiais usados nos suportes influenciam nas temperaturas superficiais da ferramenta e do porta-ferramenta, porém, que tais materiais não tem efeito significativo sobre as temperaturas da interface ferramenta/cavaco. Além disso, o trabalho apresenta, também, contribuições ao uso e calibração do método do termopar ferramenta-peça.
Doutor em Engenharia Mecânica
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Dilner, David. "Behavior of cutting tool coating material Ti1-xAlxN at high pressure and high temperature." Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-52773.
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The high pressure and high temperature (HPHT) behavior of Ti1-xAlxN coatings on cutting tool inserts have been of interest for this diploma work. A literature study of HPHT techniques as well as measurement methods has been done. A diamond anvil cell (DAC) would be a good device to achieve high pressure and high temperature conditions on small samples. Another way to obtain these conditions would be a cutting test, which has been performed on a Ti1-xAlxN coated cutting tool insert with x = 0.67. Also a cubic press could be used to apply HPHT on a Ti1-xAlxN sample or a large volume press on a whole cutting tool insert. To measure hardness on thin coatings a nanoindentor could be used, which have been done on heat-treated Ti0.33Al0.67N and TiN samples. X-ray diffraction (XRD) is a suitable method to measure phase composition of a sample and was performed on the cutting tested insert as well as on an untreated reference insert. Three ways to continue this project have been outlined all starting with more comprehensive cutting tests.
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Stjernstoft, Tero. "Machining of Some Difficult-to-Cut Materials with Rotary Cutting Tools." Doctoral thesis, KTH, Production Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3693.
Full textAbstract:
Automobile and aero industries have an increasing interestin materials with improved mechanical properties. However, manyof these new materials are classified as difficult-to-cut withconventional tools. It is obvious that tools, cutting processesand cutting models has to be devel-oped parallel to materialsscience. In this thesis rotary cutting tools are tested as analternative toexpensive diamond or cubic bore nitridetools.
Metal matrix composites mostly consist of a light metalalloy (such as aluminium or titanium) reinforced with hard andabrasive ceramic parti-cles or fibres. On machining, thereinforcement results in a high rate of tool wear. This is themain problem for the machining of MMCs. Many factors affect thelife length of a tool, i.e. matrix alloy, type, size andfraction of the reinforcement, heat treatment, cuttingconditions and tool properties.
In tests, the Al-SiC MMC formed a deformation layer duringmilling, probably affected by lack of cooling. The dominatingfactor for tool life was the cutting speed. Water jet or CO2cooling of turning did not provide dramatic increase in toollife. With PCD, cutting speeds up to 2000 m/min were usedwithout machining problems and BUE formation. Tool flank wearwas abrasive and crater wear created an "orange-peel type" wearsurface. PCD inserts did not show the typical increase in flankwear rate at the end of its lifetime.
The use of self-propelled rotary tools seems to be apromising way to increase tool life. No BUE was formed on therotary tool at high cutting data. The measurements indicatethat the rotary tool creates twice as good surface as PCDtools. The longest tool life was gained with an inclinationangle of 10 degrees. Tool costs per component will beapproximately the same, but rotary cutting tool allows higherfeeds and therefore a higher production rate and thus a lowerproduction cost.
The rotary cutting operation might have a potential toincrease productiv-ity in bar peeling. The lack of BUE withrotary cutting gives hope on higher tool life. The test resultsshow that tool wear was 27% lower with rotary cutting tools.Increase of cutting speed from 22 to 44 m/min did not affectcutting forces. This indicates that the cutting speed canincrease without significant change in tool wear rate.
Issues related to rotary cutting like cutting models,cutting processes, standards, tools and models have beendiscussed. A tool wear model with kinetic energy has beendiscussed.
KEYWORDS:Difficult-to-Cut material, Metal MatrixComposite (MMC), Machining, Machinability, Rotary Cutting Tool,Acoustic Emission