Дисертації з теми "The nature of engineering"
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Zhou, Wei. "Field research on the nature of engineering work." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0006/NQ34863.pdf.
Повний текст джерелаFredriksson, Martin. "Online engineering : On the nature of open computational systems." Doctoral thesis, Karlskrona : School of Engineering, 2004. http://www.bth.se/fou/forskinfo.nsf/01f1d3898cbbd490c12568160037fb62/6e264e47dd7fe26fc1256f160032e185!OpenDocument.
Повний текст джерелаGopalakrishnan, Varsha. "Nature in Engineering: Modeling Ecosystems as Unit Operations for Sustainability Assessment and Design." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1500460468877501.
Повний текст джерелаMohiuddin, Mohammed Aijaz. "Engineering Nature-Inspired Heuristics for the Open Shortest Path First Weight Setting Problem." Thesis, University of Pretoria, 2018. http://hdl.handle.net/2263/65988.
Повний текст джерелаThesis (PHD)--University of Pretoria, 2018.
Computer Science
PhD
Unrestricted
Mohiuddin, Aijaz. "Engineering nature-inspired heuristics for the open shortest path first weight setting problem." Thesis, University of Pretoria, 2009. http://hdl.handle.net/2263/67812.
Повний текст джерелаThesis (PhD)--University of Pretoria, 2018.
Computer Science
PhD
Unrestricted
Wolmarans, Nicolette Sarah. "The nature of professional reasoning: An analysis of design in the engineering curriculum." Doctoral thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25654.
Повний текст джерелаAl-Julaifi, Mohammed Zaid Nasser. "Production of the mycotoxin patulin in nature." Thesis, University of Sheffield, 1995. http://etheses.whiterose.ac.uk/6048/.
Повний текст джерелаDoeringer, Joseph A. (Joseph Alfred). "An investigation into the discrete nature of human arm movements." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9395.
Повний текст джерелаRedmill, Keith Alan. "Automated vehicles : the nature and implementation of autonomous multi-agent systems /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu148795356777093.
Повний текст джерелаSmit, Reneé. "The nature of engineering and science knowledge in curriculum: a case study in thermodynamics." Doctoral thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25532.
Повний текст джерелаWu, Xinyang. "Nature of Solid Organic Matters in Shale." Marietta College Honors Theses / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=marhonors1335652417.
Повний текст джерелаFermor, Philip M. "Establishment of a reedbed within a created surface water fed wetland nature reserve." Thesis, Aston University, 1997. http://publications.aston.ac.uk/13280/.
Повний текст джерелаVenter, Jaco. "The nature of conflict within an engineering company in the North West Province / Jaco Venter." Thesis, North-West University, 2006. http://hdl.handle.net/10394/1236.
Повний текст джерелаReichert, Steffen H. (Steffen Heinz). "Reverse engineering nature : design principles for flexible protection inspired by ancient fish armor of Polypteridae." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/64564.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 98-101).
This thesis is about designing structures that combine the dual functions of mechanical protection and flexibility of motion. The structures are inspired by principles observed in the ganoid squamation (scale assembly) of an ancient fish species called Polypteridae, which first appeared 96 million years ago. Prior work on Polypteridae has focused on understanding the role of the inherent material properties (e.g., stiffness, strength, etc.) of the individual bony scales to provide penetration resistance. Here, geometric design is explored at increasingly larger length scales including 1) morphometric features within individual scales, 2) morphometry of the individual scales as a whole, 3) scale-to-scale interconnections and anisotropic ranges of motion, and, lastly, 4) the entire assembled scale squamation and anisotropic ranges of motion of the entire fish body. Experimental, computational, and mathematical methods employed were micro-computed tomography, microscopy, morphometric analysis, and three-dimensional printing of prototypes. The geometrical design principles discovered were related to biomechanical mobility and protection and then implemented into a generalized, functional design system which possesses similar anisotropic distinctive degrees of freedom and ranges of motion as Polypteridae. The design system offers potential for applications in fields of transportation, military, and architecture.
by Steffen H. Reichert.
S.M.
Markcrow, Katelin. "Engineering Nature under Climate Change – Implications of Assisted Migration on Sustainable Development in Mountain Ranges." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-324297.
Повний текст джерелаAlekseeva, Iuliia. "Alternative healing in Berlin : nature, arts and science for human recharge." Thesis, KTH, Arkitektur, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254531.
Повний текст джерелаNakanishi, Bradley Rex. "On the electrolytic nature of molten aluminum and rare earth oxides." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115607.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references.
The electrolytic cell method and its application for Gibbs energy measurement in high temperature, concentrated ionic melts was investigated. Previous challenges related primarily to signal interpretation during decomposition voltage measurement have hindered determination of Gibbs energy. An electrolytic cell method is proposed herein utilizing the sensitivity of large amplitude alternating current voltammetry, which enabled precise measurement of chemical potential during electrolytic decomposition. A novel, containerless approach for electrochemical study of high temperature, reactive electrolytes in a molten pendant droplet is described. For the first time, melts of pure alumina, lanthana and yttria were electrolytically decomposed to metal alloy and oxygen gas using iridium electrodes. The method was validated in molten alumina. Systematic investigation of the half-cell reactions corresponding to oxygen evolution and aluminum deposition revealed their electrochemical nature. Measurements of the chemical potential and partial molar entropy of aluminum in an iridium-rich, binary alloy liquid were obtained in close agreement with previous predictions. The method was extended to the pseudo-binary system molten lanthana-yttria. The results revealed selective extraction of lanthanum and indicated that molten lanthana-yttria does not exhibit ideal mixing behavior, contradicting previous predictions. However, data interpretation in multicomponent electrolyte compositions were challenged primarily by a lack of thermodynamic data for the attendant alloy system and influence of dissolved oxygen on the observed alloy composition. This work represents a pioneering effort for electrochemical operation in molten refractory oxides at temperatures above 2000 K.
by Bradley Rex Nakanishi.
Ph. D.
Luckyanova, Maria N. (Maria Nickolayevna). "Observation and manipulation of the wave nature of phonon thermal transport through superlattices." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101535.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 101-130).
As the scale of electronic, photonic, and energy harvesting devices has shrunk, the importance of understanding nanoscale thermal transport has grown. In this thesis, we investigate thermal transport through superlattices (SLs), periodic layers of thin films, to better understand thermal conduction at these small scales. The classical picture of nanoscale thermal transport invokes a picture of diffusive scattering of phonons, or lattice vibrations, at the interfaces and boundaries in structures. This picture has been used to explain experimental thermal transport results for a wide variety of nanostructures. Despite the omnipresence of this particle-transport picture of phonon heat conduction, the community has continuously sought an experimental demonstration of the wave regime of thermal transport in nanostructures. In this thesis, we report the first experimental observations of the regimes of coherent phonon transport and phonon localization in thermal conduction through nanostructures. First, in order to better understand thermal transport through SLs, we present measurements of anisotropic thermal conductivity in the same GaAs/AlAs SLs using two different optical techniques, time-domain thermoreflectance (TDTR) for cross-plane measurements, and transient thermal grating (TTG) for in-plane measurements. The results of this study lend insight into the role of interface scattering, previously understood to be the dominant scattering mechanism in these structures, in SLs. The experimentally measured thermal conductivities are compared to results from first principles simulations, and the agreement between the two helps to validate atomistic simulation techniques of transport through SLs. The role of coherent phonon transport is explored by using the TDTR technique to measure the thermal conductivities of SLs with the same period thicknesses but varying numbers of periods. This experimental approach is a departure from traditional studies of SLs where period thicknesses are varied while the SL is grown to be thermally thick. This shift in the experimental paradigm allows us to explore previously elusive phenomena in nanoscale thermal transport. Combined with first principles and Green's functions simulations, the results of these experiments are the first experimental observation of coherent phonon transport through SLs. Finally, experiments on GaAs/AlAs SLs with varying concentrations of ErAs nanodots at the interfaces show the ability to destroy this phonon coherence. The thermal conductivities of such SLs with constant period thicknesses and varying numbers of periods show an overall reduction in thermal conductivity with increasing ErAs concentration. In addition, at low temperatures samples with ErAs at the interfaces show a maximum in thermal conductivity with shorter sample length and then a drop-off for longer samples. These results are signatures of phonon localization, a previously unobserved thermal transport phenomenon.
by Maria N. Luckyanova.
Ph. D.
Wakeman, Christopher Edward. "The nature of assessment, its validity and its relationship with learning on BTEC (NC) courses in engineering principles." Thesis, n.p, 2002. http://oro.open.ac.uk/18837.
Повний текст джерелаHarris, Geoffrey S. "Adverse effects in civil engineering contracts in Hong Kong arising from the confidential nature of arbitration." access abstract and table of contents access full-text, 2006. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?ma-slw-b2184317xa.pdf.
Повний текст джерела"Master of Arts in arbitration and dispute resolution, LW6409 Research project" Title from PDF t.p. (viewed on May 22, 2007) Includes bibliographical references.
Kulkarni, Amit S. "Nature of Branching in Disordered Materials." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1190655419.
Повний текст джерелаHentz, Olivia Dolores. "The uncommon nature of point defects in organic-inorganic Perovskite solar cells." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/117781.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 133-148).
Organic-inorganic perovskite solar cells (PSCs) have shown enormous success in the past decade, increasing in power conversion efficiency from ~4% in 2009 to >22%. One of the critical properties that contributed to this success is "defect tolerance": in organic-inorganic perovskites, the majority of point defects with low formation energy are shallow, with energies within or near the conduction or valence band. Defects with deep states, which act as electronic traps, are expected to be much less common due to their high formation energies. In this thesis, we demonstrate that, despite the preference for shallow defects, point defects play an integral role in materials properties and PSC device performance. We first study the role of point defects on nanoscale luminescence properties of inorganic-organic perovskites by using cathodoluminescence in scanning transmission electron microscopy (STEM). By correlating local luminescence properties with compositional variations using STEM, we demonstrate that iodide segregation induced by the electron beam is correlated with a spatially-localized high-energy emission. Similar high-energy emission has been observed in photoluminescence (PL) measurements for films made in the presence of excess methyl ammonium iodide, demonstrating that the observed defect segregation is relevant to practical device design. Next, we study the effects of directional point defect segregation under an applied electric field on current extraction from PSCs. Specifically, we use electron beam-induced current measurements in a scanning electron microscope to measure the inhomogeneity in current extraction before and after forward biasing the device. These measurements point to preferential defect migration at extended defects and allow us identify low frequency capacitive elements related to compensation of charged defect segregation under applied biasing. Finally, we directly track the migration of deep defects in PSCs through photoluminescence mapping of laterally biased perovskite films. Removal of defect states by mild voltage biasing results in over an order of magnitude increase in luminescence. Using Monte Carlo simulations of defect drift and diffusion to model these time dependent luminescence maps, we extract the mobility of these point defects and provide evidence of demonstrates the ways in which deep and shallow defects play a critical role in PSCs and suggests that, despite their "defect tolerance," the ultimate stability and performance of PSCs will be dependent on either minimizing the presence of point defects in these materials or inhibiting defect migration.
National Science Foundation (U.S.) under award number DMR-141-9807
by Olivia Dolores Hentz.
Ph. D.
Schutte, C. S. L. "Executing innovation projects using the collaborative nature of integrated knowledge networks." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/1284.
Повний текст джерелаENGLISH ABSTRACT: Innovation is important for competitiveness. It thrives on the availability of novel public and private domain knowledge. Thus the ability to access, analyze, synthesize, share, and re-use knowledge is paramount to enabling innovation within the different partners of the supply chain. These activities grow the available pool of knowledge. It also facilitates learning from mistakes, as well as capturing and enhancing opportunities for future innovation. Proactively networking resources within a formal and informal structure improve the ability of any participating enterprise to use/re-use knowledge, in a concurrently growing knowledge base. Such a "Knowledge Network” (KN) enhances knowledge sharing between and among individuals, groups and organizations in informal and formal ways. This network is also scalable in the sense that more individuals and enterprise may join the network as success cases are reported on. It is clear that knowing how to design, deploy and operate a Knowledge Network could be highly beneficial. How to successfully design and deploy a KN is a challenge and has been widely researched to a limited extent within in the past decade. The design, deploy and operate functions require understanding of social processes and how people learn and share knowledge. KN management requires a proactive, systematic approach to the planning and deployment of a formalized network for knowledge creation and transfer. It addresses promoting and improving conditions to cultivate informal and formal networking within a larger collaborative network of enterprises. This dissertation presents a refined methodology for initiating, deploying, managing and operating an Innovation Project based on the available research reported in this domain. It incorporates concepts of generic, partial and specific roadmaps, best practices, templates and examples and allows individual teams to capture knowledge about specific projects and expertise in context for later re-use.
AFRIKAANSE OPSOMMING: Om mededingend te kan wees, is innovasie belangrik. Laasgenoemde floreer op die beskikbaarheid van nuwe publieke, sowel as private domein kennis. Dus is die kundigheid om kennis te assesseer, te analiseer, saam te vat, uit te ruil met ander en dan weer te gebruik van die uiterste belang om innovasie moontlik te maak vir die onderskeie vennote in die voorsieningsketting. Hierdie genoemde aktiwiteite vergroot die beskikbare poel van kennis. Daarbenewens fasiliteer dit ook leer uit foute, sowel as die vasvang en versterking van geleenthede vir toekomstige innovasie. Deur pro-aktief en vindingryk van netwerk bronne gebruik te maak, binne ʼn formele sowel as informele struktuur, word die moontlikheid van enige deelnemende onderneming om kennis te gebruik of te hergebruik, vergroot in ʼn gelyktydig groeiende kennisbasis. So ʼn “Kennis Netwerk” (KN) versterk die uitruil van kennis tussen individue, groepe en organisasies op informele sowel as formele maniere. Hierdie netwerk is ook meetbaar in die sin dat hoe meer suksesse aangekondig word, deur individue en organisasies wat aansluit, hoe meer ondernemings wil aansluit. Dit is duidelik dat kennis ten opsigte van die ontwerp, ontplooiing en bestuur van ʼn Kennis Netwerk uiters voordelig kan wees. Dit is ʼn uitdaging om ʼn Kennis Netwerk suksesvol te ontwerp en te ontplooi en daar is die afgelope dekade op ʼn wye front beperkte navorsing op hierdie terrein gedoen. Die ontwerp, ontplooiing en bestuursfunksies vereis ʼn goeie begrip van sosiale prosesse met beklemtoning van hoe mense leer en kennis uitruil. Die bestuur van ʼn Kennis Netwerk moet pro-aktief en sistematies benader word, ten opsigte van die beplanning en ontplooiing van ʼn geformaliseerde netwerk vir die skep en oordrag van kennis. Die bevordering en verbetering van omstandighede kan formele sowel as informele netwerkbeoefening binne ʼn groter samewerkende netwerk van ondernemings vestig. Hierdie proefskrif bied ʼn verfynde metodologie vir die inisiëring, ontplooiing en bestuur van ʼn Innovasie Projek wat gebaseer is op die beskikbare navorsing wat in hierdie domein gerapporteer is. Dit behels konsepte van generiese, gedeeltelike en spesifieke padkaarte, asook die beste praktyke, patrone en voorbeelde en gee geleentheid vir individuele spanne om kennis ten opsigte van spesifieke projekte en kundigheid in konteks te bekom vir latere hergebruik.
Hauri, Erik Harold. "Geochemical and fluid dynamic investigations into the nature of chemical heterogeneity in the Earth's mantle." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/54358.
Повний текст джерелаBanks, Alec. "A nature inspired guidance system for unmanned autonomous vehicles employed in a search role." Thesis, Bournemouth University, 2009. http://eprints.bournemouth.ac.uk/15906/.
Повний текст джерелаBerglund, Anneli. "Val av område och områdesskydd för Natura 2000 med skogshabitat : En jämförande studie av fyra län i Sverige." Thesis, Södertörn University College, School of Life Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-1733.
Повний текст джерелаThe Natura 2000 Network is one of the European Unions many tools concerning nature conservation, and is without comparison the premier contribution when it comes to halting the loss of biodiversity. This essay is a case study on how the regional work with the Natura 2000-network has been carried out in four different counties. These counties are Södermanland, Västernorrland, Jämtland and Örebro. They have been compared based on the theoretical concept of sustainable development. This essay describes how the officials in the County Administrations view the regional implementation of Natura 2000 when it comes to the selection of Natura 2000-sites with forest habitats and the creation of an additional protective measure. This study takes its basis in a bottom-up approach which focuses on value conflicts that have emerged regionally and how different fundamental attitudes brings forward different aspects of sustainable development. Interviews with County Administration officials show that there are differences in the approach and different key factors that have affected the selection of sites and the work with area protection. One approach starts from an ecological point of view while the other takes the socio-economic aspect more into consideration during the selection process. Two main factors that have emerged are also the importance of the regional landowner-structure and the evident time- and staff shortage that has been experienced in all four counties. The results also show that the nature reserve form is the most common area protection for Natura 2000-sites with forest habitats in the four examined counties.
Natura 2000-nätverket är ett av EU:s många verktyg och i särklass det främsta bidraget till att hejda förlusten av den biologiska mångfalden. Denna uppsats är en fallstudie för att se hur det regionala arbetet med Natura 2000-nätverket sett ut i fyra olika län. Dessa län är Södermanland, Västernorrland, Jämtland och Örebro län. De har jämförts utifrån det teoretiska begreppet hållbar utveckling. Uppsatsen beskriver hur tjänstemän på länsstyrelserna ser på den regionala implementering av Natura 2000-nätverket när det gäller urval av Natura 2000-område med skogshabitat och tillblivelsen av ett ytterliggare områdesskydd.
Studien utgår från ett underifrånperspektiv som fokuserar på de värdekonflikter som uppstått regionalt och hur olika grundinställningar lyfter fram olika aspekter av hållbar utveckling. Intervjuer med länsstyrelsens aktörer visar att det finns skillnader i tillvägagångssättet och olika nyckelfaktorer som påverkat urvalet av område och arbetet med områdesskyddet. Det ena tillvägagångssättet tar sin grund i ett mer ekologiskt synsätt medan det andra tar större hänsyn till de socioekonomiska aspekterna i urvalsprocessen. Två huvudfaktorer som framkommit är även betydelsen av den regionala markägarstrukturen och den upplevda personal - och tidsbrist som tydligt framgår i alla de fyra undersökta länen. Resultatet visar även att naturreservatsformen är det vanligaste områdesskyddet för Natura 2000-områden med skogshabitat i de fyra studerade länen
Nowlin, Robert Nathaniel 1966. "The electrostatic nature of contaminative particles in a semiconductor processing plasma." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277802.
Повний текст джерелаSappok, Alexander G. (Alexander Georg). "The nature of lubricant-derived ash-related emissions and their impact on diesel aftertreatment system performance." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/50586.
Повний текст джерелаIncludes bibliographical references (p. 287-292).
Diesel particulate filters (DPF) have seen widespread use in on- and off-road applications as an effective means for meeting increasingly stringent particle emissions regulations. Over time, incombustible material or ash, primarily derived from metallic additives in the engine lubricant, accumulates in the DPF. Ash accumulation leads to increased flow restriction and an associated increase in pressure drop across the particulate filter, negatively impacting engine performance and fuel economy, and eventually requiring filter removal for ash cleaning. While the adverse effects of ash accumulation on DPF performance are well known, the fundamental underlying mechanisms controlling these effects are not. This work explores the parameters influencing key ash properties such as porosity and permeability, and factors controlling the soot deposition - ash formation/accumulation process, which ultimately determines the magnitude of the ash effect on DPF pressure drop. In addition to the ash properties, the location of ash deposit accumulation inside the DPF channels, whether in a cake layer along the filter walls or packed in a plug at the rear of the channels, also plays a major role in influencing DPF pressure drop. Through a combined approach employing targeted experiments and theoretical models, explanations for the key factors and processes controlling ash properties and their effects on DPF pressure drop were developed.
(cont.) These results, among few fundamental data of this kind, correlate changes in diesel particulate filter performance with lubricant chemistry, exhaust conditions, and ash morphological characteristics. Results are useful in optimizing the design of the combined engine-aftertreatment-lubricant system for future diesel engines, balancing the requirements of additives for adequate engine protection with the requirements for robust aftertreatment systems.
by Alexander Sappok.
Ph.D.
Gurera, Dev. "Lessons from Nature and Bioinspired Fabrication: Mosquito Bite and Lotus Leaf Inspired Superliquiphobic Leather." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1511962660965442.
Повний текст джерелаAdamek, Anna. "Incorporating power and assimilating nature: Electric power generation and distribution in Ottawa, 1882--1905." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26435.
Повний текст джерелаBeneitez, Miguel, and Johan Sundin. "Turbulent flow control via nature inspired surface modifications." Thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-206189.
Повний текст джерелаMånga naturligt förekommande flöden är turbulenta. Naturen har också gett upphov till flera typer av ytskikt som kan påverka dessa. Hajars skinn har räfflor, fiskar har slem som innehåller polymerer och lotusblommans yta har superhydrofobiska egenskaper, men ofta har dessa naturliga ytskikt också andra egenskaper. På grund av miljoner år av anpassning så finns det ändå många skäl att studera dessa. Detta arbete är en studie av naturinspirerade ytskikt, där målet har varit passiva flödesmanipulationer. Målet har inte varit att åstadkomma en ytfriktionsminskning, utan att få en bättre förståelse om hur dessa ytskikt påverkar turbulenta flöden. Simuleringar har utförts i en kanalliknande geometri, där en kanalväggs randvillkor har modifierats. En makroskopisk beskrivning har använts för att simulera superhydrofobiska och porösa ytor och en mikroskopisk beskriving har använts för att simulera fibrer, både stela och böjbara, fastsatta på en kanalvägg. För flödet med det makroskopiskt beskrivna randvillkoret har en pseudospektral metod använts och för flödet med det mikroskopiskt beskrivna randvillkoret har en lattice-Boltzmannmetod använts. Den superhydrofobiska ytan implementerades genom en generell tensorformulering. Ett randvillkor med nollskild hastighet i kanalens riktning gav upphov till en ytfriktionsminskning och ett randvillkor med nollskild hastighet vinkelrät mot kanalens riktning gav upphov till en ökad ytfriktion, i överensstämmelse med tidigare resultat. Nollskilda icke-diagonala tensorelement gav upphov till en smärre ökning av ytfriktionen, utan att nämnvärt förändra flödet. De porösa ytorna gav upphov till en ytfriktionsökning och hade stor inverkan på de turbulenta strukturerna. Dessa ytor bildade tvådimensionella struturer vinkelrät mot kanalens riktning. Varken de stela eller de böjbara fibrerna gav upphov till stora ändringar i hastighetsfältet. Däremot uppstor cirkulationszoner och dessa var starkare under stråkstrukturer med hög hastighet. De böjbara fibrerna uppvisade likheter med porösa material genom en interaktion mellan det vertikala hastighetsfältet och de turbulenta tryckfluktuationerna. Denna interaktion uppstod inte för de stela fibrerna. Fibrernas böjning korrelerade också i stor utsträckning till tryckfluktuationerna.
Andersson, Harald. "The role of peri-urban nature in outdoor sports and outdoor recreation : Insights from Rudan nature reserve in Stockholm." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298312.
Повний текст джерелаUtomhusidrott och friluftsliv utgör uppskattade inslag i många människors vardag, men med fortsatt förtätning i städer och i stadsnära grönområden riskerar de framtida möjligheterna att delta i sådana aktiviteter att försämras. För att möta dessa aktiviteters behov, framförallt då de utsätts för konkurrens av andra samhällsintressen, är det nödvändigt att förstå grunderna för deltagande i sådana utomhusaktiviteter, samt hur naturlandskapet används och bidrar till upplevelsen. Syftet med detta examensarbete är därför att undersöka motiv och preferenser bland deltagare i olika naturrelaterade idrotts- och friluftsaktiviteter, och att därutöver beskriva naturens roll och deltagarnas relation till naturlandskapet. Då många tidigare studier har fokuserat på friluftsliv, där deltagande traditionellt sett är inriktat på rekreation och välmående, vänder sig denna studie främst mot idrottsaktiviteter, där deltagande i allmänhet är mer fysiskt och resultatinriktat. Studien har ett beskrivande tillvägagångssätt där Rudan, ett naturreservat i södra Stockholm, används som fallstudie. Flera metoder har använts, men data har främst inhämtats genom en enkätundersökning (N = 64) som besvarades av medlemmar i idrottsföreningar i Rudan samt av besökare på plats. Svaren analyserades sedan med hjälp av pivottabeller. Resultaten visar att det finns olika, och ofta flera, motiv för att delta i aktiviteterna och för att utföra aktiviteterna i ett visst område. Resultaten visar även att naturlandskapet har en viktig roll, sett ur många aspekter. Det kan vara en motiverande faktor, en arena för aktiviteten och bidra till många övriga mervärden. Då antalet respondenter i studien var relativt lågt är studiens resultat dock något osäkert, och mer omfattande undersökningar behövs för att skapa tydligare förståelse. Trots det kan resultaten i studien användas för att öka medvetenheten och tydliggöra naturens värde inom utomhusidrott och friluftsliv. Naturens många olika värden och roller för idrotts- och friluftslivsutövare bör sedan beaktas inom samhällsplaneringen i stort och vid framtida utveckling av stadsnära natur- och rekreationsområden.
Kassabian, Paul E. (Paul Edward) 1974. "On the design of a kinetic adaptive structural surface with reference to nature, form and simplicity." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29568.
Повний текст джерелаIncludes bibliographical references (p. 89-90).
The central thrust of this thesis is that there is much to learn from Nature. What surrounds us, and has been with us from the beginning of time, still has many insights to offer, if we are only willing to look. In Nature, shape is cheaper than material. Forces and form are continuously linked and the concept of adaptability is central to survival. Many of our designs, in contrast, have been over-designed, unresponsive and unchangeable. This thesis covers how well thought through form can yield impressive benefits which, in combination with adaptability, can create structures that are efficient as well as beautiful. Specific forms in Nature are discussed as well relevant historical examples from the built environment; including new work in deployable structures. As an example of these concepts, a kinetic adaptive structural surface was designed and built. This responded to applied loads by actively changing its shape. The thesis concludes with a discussion on emergence as one of the ways ahead for structural design that involves distributed sensing and control.
Paul E. Kassabian.
S.M.
Smith, Joseph Martin. "The stochastic nature of cardiac electrical instability : theory and experiment." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/14339.
Повний текст джерелаVita.
Includes bibliographical references (leaves 190-206).
by Joseph Martin Smith.
Ph.D.
Edström, Kristina. "Exploring the dual nature of engineering education : Opportunities and challenges in integrating the academic and professional aspects in the curriculum." Doctoral thesis, KTH, Lärande, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217315.
Повний текст джерелаQC 20171108
Tiberg, Linnéa. "Addera mervärde till plan- och byggprocessen med Nature-based solutions." Thesis, Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-45524.
Повний текст джерелаWagner, Ross. "Binocular coordination : providing stable tracking and rapid reorientation using a bilateral controller inspired by nature." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35645.
Повний текст джерелаThe controller was applied to an artificial vision system and its 3-D tracking performance was evaluated. Eye (camera) movements consist of an appropriate mix of slow (tracking) and rapid (reorienting) motions. This is the first implementation of an artificial vision control system which: (1) Controls two eyes independently, in 2-D, for target motion in one plane. (2) Provides integrated conjugate and vergence coordination. (3) Provides integrated slow and fast operating modalities. (4) Has the intrinsic ability to hold gaze in the absence of a target.
The controller is also well suited for extensions to coordinate multiple platforms (e.g. eyes on mobile head) using a conceptually simple motor-error control scheme. Its sensory-fusion properties make the controller receptive to the inclusion of a VOR system, essential in mobile robots.
Sánchez, Ferrero Aitor. "Biomimetic hydrogels for in situ bone tissue engineering : nature-inspired crosslinking methods as a tool to tune scaffold physical properties." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/373909.
Повний текст джерелаS'espera que la incidència global de fractures òssies, i per extensió la d'aquelles que no són capaces de consolidar per si soles, augmenti en les pròximes dècades, principalment degut a l'increment del risc de patologies associades a l'envelliment. Actualment, el camp dels biomaterials es mou cap al disseny de bastides que mimetitzen el microambient cel·lular per tal de guiar la diferenciació de cèl·lules mare i recapitular el desenvolupament de teixits diana. El biomimetisme és un concepte ampli i diverses aproximacions han sigut dutes a terme per tal de produir bastides capaces de guiar el comportament cel·lular. En aquesta tesi hem explorat l'ús d'àcid cítric i l'enzim lisil oxidasa, ambdós relacionats amb la nanoestructura i propietats mecàniques del teixit ossi, per desenvolupar bastides que mimetitzin la matriu extracel·lular de l'os en desenvolupament. En primer lloc, es va produir hidrogels basats en polímers recombinants de tipus elastina (Elastin-like recombinamers; ELRs) mitjançant una reacció d'entrecreuament en un pas amb àcid cítric, una molècula actualment considerada una peça essencial per l'adequat funcionament mecànic del teixit ossi. Havent fet un estudi sistemàtic de la reacció d'entrecreuament i de la seva contribució a les propietats dels hidrogels, vam ser capaços de controlar l'arquitectura i la rigidesa de les bastides entrecreuades amb àcid cítric, tot preservant la integritat de les seqüències d'adhesió cel·lular contingudes als ELRs. És interessant remarcar que l'ús d'àcid cítric com agent entrecreuant conferí als hidrogels capacitat de nucleació de fosfats de calci. Es va demostrar que els hidrogels entrecreuats amb àcid cítric i amb propietats mecàniques diana permeten el creixement de cèl·lules mare mesenquimals humanes i donen lloc a productes de degradació aparentment biocompatibles. Tot i que els estudis de diferenciació in vitro no van ser concloents pel que fa al potencial osteogènic d'aquestes bastides, tant les matrius amb propietats mecàniques diana com aquelles control van ser capaces d'integrar-se amb l'os natiu i van ser parcialment degradades un cop implantades en defectes de mida crítica en calotes de ratolí. Tot i que la invasió cel·lular en hidrogels amb propietats mecàniques diana va ser inferior en comparació amb l'observada en bastides control, ambdós tipus de matrius van permetre la formació d'os nou, mitjançant ossificació intramembranosa, en quantitats similars al final de l'estudi. Als punts temporals seleccionats, ambdós tipus de bastides van demostrar ser osteoconductives, però no es va observar evidències d'osteoconducció en cap cas. El fet que les bastides amb propietats mecàniques diana no fossin superiors a les matrius control pel que fa a formació òssia, podria ser degut a (i) a una elevada densitat superficial que hauria dificultat la invasió cel·lular i retrassat l'osteoinducció, o (ii) a una combinació de propietats (químiques + físiques) no osteoinductiva tot i que les bastides posseïen una rigidesa teòricament osteoinductiva. Aquests resultats demostren que les bastides han de ser vistes com un tot donada l'elevada complexitat del nínxol de cèl·lules mare in vivo, les senyals del qual actuen de forma sinèrgica per definir el comportament cel·lular. Així, és necessari assolir bastides amb un nivell de complexitat més elevat per tal de recapitular el desenvolupament ossi. Addicionalment, es va produir lisil oxidasa (LOX) d'aorta humana en forma recombinant a elevada puresa a partir de cultius d'Escherichia coli. Tot i que es va aconseguir produir LOX amb un contingut del cofactor coure i una activitat superiors a aquells trobats en la literatura, l'activitat de l'enzim va ser generalment baixa i no es va assolir la insolubilització d'ELRs. Això evidencia la necessitat de desenvolupar nous sistemes d'expressió i purificació de l'enzim per tal que aquest pugui ser aplicat a la producció de bastides.
Spradlin, Joshua K. "A Study on the Nature of Anomalous Current Conduction in Gallium Nitride." VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd/709.
Повний текст джерелаMullenite, Joshua. "Engineering Colonialism: Race, Class, and the Social History of Flood Control in Guyana." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3800.
Повний текст джерелаNatali, Andrea. "Double Dyke System - Natural engineering solutions." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21243/.
Повний текст джерелаFermor, Hazel Louise. "Engineering of natural cartilage substitution biomaterials." Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/6328/.
Повний текст джерелаCostelloe, S. J. "Natural evolution and engineering of transketolase." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1446302/.
Повний текст джерелаWilliams, James J. M. B. A. "Living with nature the Farnsworth House and the environmental successes and failures of Modernist architecture." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1445342413.
Повний текст джерелаSinger, Marc. "Study and Modeling of the Localized Nature of Top of the Line Corrosion." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1372426641.
Повний текст джерелаBajwa, Sohaib-Shahid. "Investigating the Nature of Relationship between Software Size and Development Effort." Thesis, Blekinge Tekniska Högskola, Avdelningen för för interaktion och systemdesign, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-6004.
Повний текст джерелаSoftware effort estimation still remains a challenging and debatable research area. Most of the software effort estimation models take software size as the base input. Among the others, Constructive Cost Model (COCOMO II) is a widely known effort estimation model. It uses Source Lines of Code (SLOC) as the software size to estimate effort. However, many problems arise while using SLOC as a size measure due to its late availability in the software life cycle. Therefore, a lot of research has been going on to identify the nature of relationship between software functional size and effort since functional size can be measured very early when the functional user requirements are available. There are many other project related factors that were found to be affecting the effort estimation based on software size. Application Type, Programming Language, Development Type are some of them. This thesis aims to investigate the nature of relationship between software size and development effort. It explains known effort estimation models and gives an understanding about the Function Point and Functional Size Measurement (FSM) method. Factors, affecting relationship between software size and development effort, are also identified. In the end, an effort estimation model is developed after statistical analyses. We present the results of an empirical study which we conducted to investigate the significance of different project related factors on the relationship between functional size and effort. We used the projects data in the International Software Benchmarking Standards Group (ISBSG) dataset. We selected the projects which were measured by utilizing the Common Software Measurement International Consortium (COSMIC) Function Points. For statistical analyses, we performed step wise Analysis of Variance (ANOVA) and Analysis of Co-Variance (ANCOVA) techniques to build the multi variable models. We also performed Multiple Regression Analysis to formalize the relation.
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Seidel, Gary Don. "Micromechanics modeling of the multifunctional nature of carbon nanotube-polymer nanocomposites." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1881.
Повний текст джерелаGeorgaki, Eleni. "The Changing Nature of Work and Worker in the Digital Era." Thesis, Linnéuniversitetet, Institutionen för informatik (IK), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-81018.
Повний текст джерелаLindell, Linda. "Interface Engineering in Organic Electronics." Doctoral thesis, Linköpings universitet, Ytors Fysik och Kemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-72236.
Повний текст джерелаVosloo, Robert Nicolaas. "The role of civil engineering professionals within the housing environment in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20146.
Повний текст джерелаENGLISH ABSTRACT: The development of mass housing is an excellent example of multi-disciplinary projects. Several housing projects have been unsuccessful due to a misunderstanding of the necessary collaboration and buy-in that are required from all parties concerned. The focus of this study is to identify the required skill sets and responsibilities of the Housing Project Manager in the Housing environment, and in turn, will support the development of the foundation of the civil engineering postgraduate curricula. Civil engineers are educated with a strong focus on technical subjects, but not much attention is paid to many of the less technical aspects as found in housing projects. Furthermore, the multi-disciplinary aspects of large projects do not receive sufficient attention in either the undergraduate or postgraduate curricula. Considering that many civil engineers become actively involved as managers of housing projects, this paper will present an investigation into the requirements of the curricula of a postgraduate qualification for civil engineers towards becoming managers in housing projects. The investigation will include aspects of multi-disciplinary coordination, the less technical aspects of housing development, but will not exclude a comprehension of technical involvement. In order to identify these skill sets and responsibilities several approaches were adopted. The approaches adopted in this dissertation include: (i) a comprehensive literature study regarding the housing environment and the position of the housing project manager, (ii) a review of several housing case studies with project management related problems, (iii) consulting with several housing management professionals from different sectors in the housing industry, and (iv) a review of existing formulations of the role and responsibilities of the housing project manager. The findings from this study provide evidence that civil engineers operating in the housing environment as project managers require additional education, due to the multi-disciplinary nature of housing projects. The main conclusion drawn from this study is that educating civil engineers towards the management of housing projects would contribute significantly to the housing environment through increasing productivity and quality, and can contribute to meet the housing targets of the government.
AFRIKAANSE OPSOMMING: Die ontwikkeling van massa behuising is 'n uitstekende voorbeeld van multidissiplinêre projekte. Verskeie behuisingsprojekte was al onsuksesvol as gevolg van 'n misverstand oor die nodige samewerking en bydraes wat vereis word van alle betrokke partye. Die fokus van hierdie studie is om die vaardighede en verantwoordelikhede van die behuisingsprojekbestuurder in die behuisingsomgewing te identifiseer. Hierdie kennis ondersteun die ontwikkeling van ʼn raamwerk vir ʼn nagraadse kurrikulum in behuisingsbestuur. Siviele ingenieurs is opgelei met 'n sterk fokus op tegniese vaardighede, maar relatief min aandag word geskenk aan minder tegniese aspekte soos gevind word in behuisingsprojekte. Verder, multidissiplinêre bestuursaspekte van groot projekte ontvang nie voldoende aandag in óf die voorgraadse óf nagraadse kurrikula nie. Wetende dat baie siviele ingenieurs aktief betrokke raak as bestuurders van behuisingsprojekte, ondersoek hierdie studie ʼn raamwerk vir ʼn nagraadse kwalifikasie vir siviele ingenieurs as bestuurders van behuisingsprojekte. Die ondersoek sluit in aspekte van die multidissiplinêre koördinasie asook minder tegniese aspekte van behuisingsontwikkeling, maar dit sluit nie 'n begrip van die tegniese betrokkenheid uit nie. Verskeie benaderings is toegepas om die vaardighede en verantwoordelikhede van behuisingsbestuurders te identifiseer. Die benaderings sluit in: (i) 'n omvattende literatuurstudie ten opsigte van behuising en die posisie van die behuisings-projekbestuurder, (ii) 'n oorsig van verskeie behuisings- gevallestudies met projekbestuur verwante probleme, (iii) raadpleging met verskeie professionele rolspelers van verskillende sektore in die behuisingbestuur omgewing, en (iv) 'n hersiening van bestaande beskrywings van die rol en verantwoordelikhede van die behuisings-projekbestuurder. Die bevindinge van hierdie studie verskaf bewyse dat siviele ingenieurs wat in die behuisingsbedryf as projekbestuurders optree, bykomende opleiding benodig as gevolg van die multidissiplinêre aard van projekte. Die belangrikste gevolgtrekking van hierdie studie is dat die opleiding van siviele ingenieurs in die bestuur van behuisingsprojekte ʼn aansienlike bydrae kan lewer tot behuising deur produktiwiteit en kwaliteit te verhoog. Dit kan bydra tot die bereiking van die regering se behuisingsdoelwitte.