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1

Bevan, A. M. "Exchange rate dynamics and speculative efficiency." Thesis, City University London, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373323.

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Ahlkrona, Josefin. "Computational Ice Sheet Dynamics : Error control and efficiency." Doctoral thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-283442.

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Ice sheets, such as the Greenland Ice Sheet or Antarctic Ice Sheet, have a fundamental impact on landscape formation, the global climate system, and on sea level rise. The slow, creeping flow of ice can be represented by a non-linear version of the Stokes equations, which treat ice as a non-Newtonian, viscous fluid. Large spatial domains combined with long time spans and complexities such as a non-linear rheology, make ice sheet simulations computationally challenging. The topic of this thesis is the efficiency and error control of large simulations, both in the sense of mathematical modelling
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Koutsopoulos, Andreas [Verfasser]. "Dynamics and efficiency in topological self-stabilization / Andreas Koutsopoulos." Paderborn : Universitätsbibliothek, 2016. http://d-nb.info/1090965753/34.

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Sun, Yi. "On efficiency of multibody approach in granular dynamics simulations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/nq20898.pdf.

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5

Pereira, Wesley. "Modifying LPC parameter dynamics to improve speech coder efficiency." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32970.

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Reducing the transmission bandwidth and achieving higher speech quality are primary concerns in developing new speech coding algorithms. The goal of this thesis is to improve the perceptual speech quality of algorithms that employ linear predictive coding (LPC). Most LPC-based speech coders extract parameters representing an all-pole filter. This LPC analysis is performed on each block or frame of speech. To smooth out the evolution of the LPC tracks, each block is divided into subframes for which the LPC parameters are interpolated. This improves the perceptual quality without additional tran
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Al-khasawneh, Jamal. "Bank Efficiency Dynamics and Market Reaction around Merger Announcement." ScholarWorks@UNO, 2006. http://scholarworks.uno.edu/td/1031.

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We study, using the non-parametric data envelopment approach, we investigated the long-run profit efficiency dynamics and the short-run market reaction of nine pre-classified merger deals of merging and non-merging U.S. banks over the time period from 1992 to 2003. Our main results are as follows: First, merger deals that match least efficient acquirers with the least efficient targets could improve their profit efficiency four years following the merger event, unlike all other merger deals. Second, we find that mergers match least efficient acquirers with the least efficient targets
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Murrow, Matthew Alan. "Kinesin model for Brownian dynamics simulations of stepping efficiency." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron156441669721832.

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Pelosi, Tano Economics Australian School of Business UNSW. "Risk, efficiency and industry dynamics in the Australian banking sector." Publisher:University of New South Wales. Economics, 2008. http://handle.unsw.edu.au/1959.4/41462.

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This thesis applies innovative methods to the efficiency and productivity analysis of the Australian banking system. Key areas of investigation include the impact of regulatory reforms on bank performance, the impact of firm entry and exit on industry productivity and the changing nature of banking and the role of risk in measuring bank value-added. The latter leads to the construction of a new bank production model, emphasising risk management as part of a bank??s value-added. As such, the proposed bank output framework views risk as a productive service, rather than a bad output or externali
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Mellberg, Savannah. "Analyzing and Improving Surety Bond Underwriting Efficiency Using System Dynamics." Scholarship @ Claremont, 2018. http://scholarship.claremont.edu/scripps_theses/1149.

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The surety bond industry plays a vital role in construction and development and as it grows, the need for efficiency increases in order to maximize profits. Many surety firms have developed streamlined formulas for measuring numerical data however, despite the highly interpersonal nature of surety, the qualitative evaluation aspects of prospective clients remains inefficient. This study utilizes System Dynamics models to demonstrate a format that can easily be applied to the surety underwriting process to better and more effectively evaluate client character, ultimately leading to an increase
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Sridhar, Yerusu R. "Molecular Dynamics Simulations of Organic Photovoltaic Materials: Structure and Dynamics of Oligothiophene/Fullerene Blends." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1342545038.

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Vincent, Raymond A. Jr. "Efficiency analysis of the cyclone separator using CFD techniques." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17372.

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Fallah-Fini, Saeideh. "Measuring the Efficiency of Highway Maintenance Operations: Environmental and Dynamic Considerations." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77284.

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Highly deteriorated U.S. road infrastructure, major budgetary restrictions and the significant growth in traffic have led to an emerging need for improving efficiency and effectiveness of highway maintenance practices that preserve the road infrastructure so as to better support society's needs. Effectiveness and efficiency are relative terms in which the performance of a production unit or decision making unit (DMU) is compared with a benchmark (best practice). Constructing the benchmark requires making a choice between an "estimation approach" based on observed best practices (i.e., using da
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Onus, Cem O. "Continual Energy Management Dynamics| Energy Efficiency in U.S. Automotive Manufacturing Industry." Thesis, Walden University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3630443.

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<p> Managers at automotive manufacturers are seeking ways to reduce energy consumption, costs, carbon emissions, and waste from production processes. Researchers and practitioners perceive energy efficiency as the least expensive and most effective way to deal with issues related to climate change, but adoption of energy efficiency measures has been slow among industrial facilities. The topic of this research study was the decision-making process for energy efficiency projects in the U.S. automotive manufacturing industry. Flaws in this decision-making processes are preventing changes that
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14

Wang, Zehong. "Essays on efficiency, hedging effectiveness, and volatility dynamics in cryptocurrency markets." Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761018.

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This thesis contains four chapters. The first chapter introduces the background of the Bitcoin platform. The second chapter examines whether Bitcoin market is efficient by considering intra-day open, high, low and close prices. The third chapter examines the dynamic relationship between Bitcoin and Litecoin in both short run and long run by employing VARX-MGARCH-Mean model. The spillover effects are significant in both direction. For the examined time period, the covariance between Bitcoin return and the Litecoin return is not stable in the long run. The last chapter examines the hedging capab
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Onus, Cem O. "Continual Energy Management Dynamics: Energy Efficiency in U.S. Automotive Manufacturing Industry." ScholarWorks, 2011. https://scholarworks.waldenu.edu/dissertations/1144.

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Managers at automotive manufacturers are seeking ways to reduce energy consumption, costs, carbon emissions, and waste from production processes. Researchers and practitioners perceive energy efficiency as the least expensive and most effective way to deal with issues related to climate change, but adoption of energy efficiency measures has been slow among industrial facilities. The topic of this research study was the decision-making process for energy efficiency projects in the U.S. automotive manufacturing industry. Flaws in this decision-making processes are preventing changes that can
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McDonagh, Kieran D. "Systems Dynamics Simulation To Improve Timber Harvesting System Management." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/35184.

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Two computer simulation models were developed to address harvest system - stand assignment and wood flow variability problems in the southeast United States. The Harvest System Assignment (HSA) model is used to evaluate the impact of a particular stand assignment on harvest system effectiveness and is designed to assist with harvest system assignment decisions. Four general harvesting systems: manual, mechanized, shovel and cut-to-length can be modeled to harvest timber, from standing trees to processed logs loaded on to trucks. Model testing showed that as terrain, tract and system character
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Weiner, Steven David 1956. "The effect of improved aircraft efficiency on helicopter sales using system dynamics." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/91712.

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Oikonomidis, Anastasios. "Weak form efficiency and pricing dynamics in a competitive globalised market setting." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/376060/.

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Employing data from the football betting market, we explore the impact of institutional structure on price-setting in speculative markets and the extent to which the biases induced by such factors might cause prices to deviate from fundamental values. In Chapter 1, we review the literature on football betting markets with regards to the Efficient Market Hypothesis (EMH) and find that despite sporadic evidence of pricing anomalies, more consistent and persistent evidence of exploitable betting opportunities is required for the EMH to be rejected. In Chapter 2, we investigate the favourite-longs
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Carleton, James Richard. "The Effect of Electrohydraulic Discharge on Flotation Deinking Efficiency." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6971.

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Firing an underwater spark discharge generates an expanding plasma which causes a spherical shockwave to propagate through the surrounding water. The shockwave can have many effects, including resonance effects on bubbles, mechanical destructive effects on solid surfaces and living organisms, and sonochemical oxidative effects on particles and chemical species present in the water. This phenomenon has been shown to improve the efficiency of ink removal in a laboratory flotation deinking cell, while simultaneously decreasing fiber loss. These process improvements are attributed to the sonoch
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Sovdat, Tina. "Toward understanding speed, efficiency and selectivity in retinal photochemistry." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:cfa19bb3-b399-4d26-9b9a-0ca1ff34dfa2.

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This Thesis describes the synthesis, structural, photochemical and photophysical studies of modified retinal protonated Schiff bases in solution. Ultrafast laser spectroscopy, NMR and circular dichroism studies were employed to investigate speed, yield and selectivity of photoisomerisation in these chromophores. <b>Chapter 1</b> introduces relevant biological, photophysical and photochemical aspects of retinal protonated Schiff base photoisomerisation. It includes an overview of synthetic approaches to modified retinal synthesis pertinent to this this work. <b>Chapter 2</b> discuses the invest
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Freeman, Rachel A. J. "The dynamics of consumption, resource use and waste : systems approaches to resource efficiency." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.690776.

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Resource efficiency (RE) is a characteristics of the way resources such as energy and materials are used within everyday activities and it is a critical concern for those working in the fields of climate change mitigation and environmental protection. Resource efficiency affects the rates at which resources are extracted from sources and waste streams such as greenhouse gas emissions and material wastes are generated. This thesis presents six studies in which methods from the fields of management, engineering, and systems thinking were used to evaluate and expand upon existing waste prevention
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da, Silva Cerozi Brunno, and Silva Cerozi Brunno da. "Phosphorus Dynamics, Mass Balance and Mineralization in Aquaponics Systems." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/620832.

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This study involves tracing inputs, partitioning, and outputs of phosphorus (P) through an aquaponics system. A mathematical model was developed to describe the dynamics of phosphorus in an aquaponics nutrient solution, and to maximize P use efficiency and minimize P waste. We assessed the influence of pH on the availability and speciation of phosphorus in an aquaponics nutrient solution. By using Visual MINTEQ, a freeware chemical equilibrium model for the calculation of element speciation, solubility equilibria, and sorption for natural waters, it was discovered that high pH values favor the
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Hoskins, Tyler Courtney. "Water and nutrient transport dynamics during the irrigation of containerized nursery crops." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/48165.

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Increased water- and fertilizer-use-efficiency in containerized crop production, via reduced water loss, enhances crop-available nutrients while reducing non-point source agrichemical contributions in accordance with regulatory standards. Previous studies detailed nutrient leaching patterns throughout crop production seasons, leaving little known about water and dissolved nutrient (solute) movement through soilless substrates during irrigation. The following experiments evaluated fundamental water and solute transport principles through pine-bark based substrates. 1) Ilex crenata Thunb. 'Benne
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Aljoaba, Sharif. "ACTIVE OPTIMAL CONTROL STRATEGIES FOR INCREASING THE EFFICIENCY OF PHOTOVOLTAIC CELLS." UKnowledge, 2013. http://uknowledge.uky.edu/ece_etds/18.

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Energy consumption has increased drastically during the last century. Currently, the worldwide energy consumption is about 17.4 TW and is predicted to reach 25 TW by 2035. Solar energy has emerged as one of the potential renewable energy sources. Since its first physical recognition in 1887 by Adams and Day till nowadays, research in solar energy is continuously developing. This has lead to many achievements and milestones that introduced it as one of the most reliable and sustainable energy sources. Recently, the International Energy Agency declared that solar energy is predicted to be one of
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Lans, Patrik. "Numerical Methods for Simulating Separation in a Vacuum Cleaner Cyclone." Thesis, KTH, Mekanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194498.

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This thesis includes a numerical comparison of different turbulence models and particle models in terms of convergence time and physical accuracy. A cyclone is used as the computational domain. Cyclones are common devices for separating two or more substances. The work is divided into an experimental part and a numerical part. In the experiments, characteristics of the cyclone were measured. This data is then used to evaluate different numerical modeling approaches. The numerical part consists of two parts, namely single phase flow and multiphase flow, where different modeling aspects are exam
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Hanich, Maxwell James. "Analysis of Efficiency of Laser Ablation of Aluminum By Modeling of Plume Shielding Effect." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1595509756016075.

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Yusuf, Ahmed A. "The study of down-hole hydro-cyclone efficiency in oil wells using computational fluid dynamics." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4886.

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Thesis (M.S.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains ix, 64 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 63-64).
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Zidonis, Audrius. "Optimisation and efficiency improvement of pelton hydro turbine using computational fluid dynamics and experimental testing." Thesis, Lancaster University, 2015. http://eprints.lancs.ac.uk/76836/.

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The aim of this PhD research was to develop a generic optimisation method for Pelton turbine runners and assess the key design parameters using Computational Fluid Dynamics (CFD). This optimisation was applied on a modern commercial Pelton turbine runner taken as a base design. The design together with the field knowledge and experience was provided by a turbine manufacturing company Gilbert Gilkes and Gordon Ltd. to establish the state of the art starting point. The work described in this thesis can be divided into three main parts: 1) developing of numerical modelling technique by combining
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Kang, Gloria Jin. "Systems analysis of vaccination in the United States: Socio-behavioral dynamics, sentiment, effectiveness and efficiency." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/97079.

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This dissertation examines the socio-behavioral determinants of vaccination and their impacts on public health, using a systems approach that emphasizes the interface between population health research, policy, and practice. First, we identify the facilitators and barriers of parental attitudes and beliefs toward school-located influenza vaccination in the United States. Next, we examine current vaccine sentiment on social media by constructing and analyzing semantic networks of vaccine information online. Finally, we estimate the health benefits, costs, and cost-effectiveness of influenza vac
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Anderson, Kimberly Rose. "Computational fluid dynamics (CFD) study investigating the effects of torso geometry simplification on aspiration efficiency." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/774.

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In previous studies truncated models were found to underestimate the air's upward velocity when compared to wind tunnel velocity studies, which may affect particle aspiration estimates. This work compared aspiration efficiencies using three torso geometries: 1) a simplified truncated cylinder; 2) a non-truncated cylinder; and 3) an anthropometrically realistic humanoid body. The primary aim of this work was to (1) quantify the errors introduced by using a simplified geometry and (2) determine the required level of detail to adequately represent a human form in CFD studies of aspiration efficie
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Minnich, Dennis. "Efficiency and responsiveness of supply chains in the high-tech electronics industry : a system dynamics-based investigation /." Mannheim : Mannheim Univ. Pr, 2007. http://swbplus.bsz-bw.de/bsz276041674inh.pdf.

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Potts, John B. III. "Developing and Testing an Anguilliform Robot Swimming with Theoretically High Hydrodynamic Efficiency." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2103.

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An anguilliform swimming robot replicating an idealized motion is a complex marine vehicle necessitating both a theoretical and experimental analysis to completely understand its propulsion characteristics. The ideal anguilliform motion within is theorized to produce ``wakeless'' swimming (Vorus, 2011), a reactive swimming technique that produces thrust by accelerations of the added mass in the vicinity of the body. The net circulation for the unsteady motion is theorized to be eliminated. The robot was designed to replicate the desired, theoretical motion by applying control theory methods. I
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Campbell, Steven Conner. "DETERMINATION OF ACOUSTIC RADIATION EFFICIENCY VIA PARTICLE VELOCITY SENSOR WITH APPLICATIONS." UKnowledge, 2019. https://uknowledge.uky.edu/me_etds/133.

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Acoustic radiation efficiency is defined as the ratio of sound power radiated to the surface vibration power of a piston with equivalent surface area. It has been shown that the radiation efficiency is maximized and may exceed unity when the structural and acoustic wavelengths are approximately equal. The frequency at which this occurs is called the critical frequency and can be shifted with structural modifications. This has proven to be an effective way to reduce noise. The standard radiation efficiency measurement is comprised of an intensity scan for sound power measurement and acceleromet
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Hauswald, Christian. "Dynamics of free and bound excitons in GaN nanowires." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2015. http://dx.doi.org/10.18452/17164.

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GaN-Nanodrähte können mit einer hohen strukturellen Perfektion auf verschiedenen kristallinen und amorphen Substraten gewachsen werden. Sie bieten somit faszinierende Möglichkeiten, sowohl zur Untersuchung von fundamentalen Eigenschaften des Materialsystems, als auch in der Anwendung in optoelektronischen Bauteilen. Obwohl bereits verschiedene Prototypen solcher Bauteile vorgestellt wurden, sind viele grundlegende Eigenschaften von GaN-Nanodrähten noch ungeklärt, darunter die interne Quanteneffizienz (IQE), welche ein wichtiges Merkmal für optoelektronische Anwendungen darstellt. Die vorliege
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Grace, Iain Nicholas. "Modelling the performance and dynamics of vapour compression refrigeration systems." Thesis, Brunel University, 2000. http://bura.brunel.ac.uk/handle/2438/5265.

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The impact of refrigeration systems on the environment can be reduced by the use of alternative reffigerants which are less harmful to the atmosphere and the optimisation of systems and control strategies to deliver increased levels of energy efficiency. Mathematical modelling offers the opportunity to test the performance of systems under different operating conditions and with alternative refrigerants. Dynamic models allow comparison of both transient and steady-state behaviour and this is of particular importance for liquid chillers, since these systems can operate under transient condition
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Talbot, David C. "An Experimental and Theoretical Investigation of the Efficiency of Planetary Gear Sets." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1330630066.

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Elward, Kevin M. "Shock formation in overexpanded flow: a study using the hydraulic analogy." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/45949.

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<p>Tests were performed to study the mechanism of shock formation in supersonic flow in long orifices to gain insight into the leakage flow of turbine tip gaps. The flow was modeled on a water table using a sharp-edged rectangular channel. The hydraulic analogy between free surface water flows and compressible gas flows was used to study the implications of the water table flow on tip leakage flows.</p> <p> The flow on the water table exhibited oblique hydraulic jumps starting on the channel sidewall near the channel entrance. This flow was analyzed using the oblique hydraulic jump relations d
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Nafisi, Mariam. "Applying system dynamics modeling to a machining process : With regards to environmental friendliness and energy efficiency." Thesis, KTH, Industriell produktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102555.

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Sustainability is one of the challenges in today’s world. With limited resources at hand and hazardous impact of manufacturing processes on the environment, there is an increasing need for sustainable manufacturing. Sustainability actually has a broad meaning and is an all-inclusive concept. In this thesis what we are more interested in and focus on, are energy consumption and environmental impacts. Using system dynamics modeling and simulation, we can more easily understand the behavior of processes. Our selected processes are turning, milling and drilling operations in crankshaft machining a
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Garabet, Sonia. "Fertilizer use efficiency and nitrogen dynamics in rainfed and irrigated wheat under a Mediterranean-type climate." Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262036.

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Mia, Shamim. "Biochar aging effects on nitrogen and phosphorus dynamics in grassland plants and soils: A molecular understanding of biochar properties and mechanisms." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18096.

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Soil amendment with biochar, a form of pyrogenic carbon, is increasingly advocated for its potentials including climate change mitigation and soil fertility improvement. However, our understanding of its long-term effects on nutrient cycling is incomplete. This thesis presents a molecular understanding of aging induced changes in biochar properties and how these changes relate to nitrogen (N) and phosphorus (P) dynamics in a grassland. The spectroscopic and chemical characterization of biochars showed that aging with hydrogen peroxide at different concentrations caused an incremental formation
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Åhlén, Emma. "Fingerprints of planktivory : paleolimnological evidence of past fish community structure and dynamics." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-53561.

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Planktivorous fish affect the species composition, size and morphology of their zooplankton prey by size selective predation. Remains of cladocerans are deposited in the lake sediments and this microfossil community hence reflects the historical changes in the planktivore fish community. Most earlier work on quantitatively inferring past planktivory deals with ephippia (resting eggs) of Daphnia, however these remains are very scarce in northern Swedish lakes. In these lakes, often dominated by fish that are not obligate planktivores, such as perch (Perca fluviatilis), the individual size to a
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Zakikhani, Hamed. "Assessing soil nitrogen dynamics in Vertosols cropped to cotton in subtropical Australia." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/211433/1/Hamed_Zakikhani_Thesis.pdf.

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This project assessed the contribution of Vertosols to the nitrogen supply of cotton in Darling Downs region, Australia. Two years of nitrogen dynamics measurements throughout the soil profile under field and laboratory conditions demonstrated that, on average, 87 per cent of nitrogen was supplied by the soil to the cotton crop. This research provides a practical framework for establishing a sustainable nitrogen management strategy to enable efficient use of nitrogen in irrigated cotton production. The results of this research are potentially applicable to similarly managed cropping systems in
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Clark, Barrett C. "Energetic efficiency and stability in bipedal locomotion: 3D walking and energy-optimal perturbation rejection." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1534579029132854.

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Genis, Amelia Jasmine. "Accumulation and differentiation: the dynamics of change in the large-scale commercial farming sector of South Africa." University of the Western Cape, 2015. http://hdl.handle.net/11394/4673.

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Philosophiae Doctor - PhD<br>The general image of large-scale commercial farming in South Africa is one of technological dynamism and international competitiveness. However, such a generalisation obscures considerable differentiation in terms of size, scale, capital reproduction strategies and future directions of change between and within farming regions. My study on reproduction, accumulation and differentiation in the large-scale commercial farming sector makes a small contribution towards explaining this substantive diversity, as well as the underlying processes at work, in three different
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Gunasekaran, Sidaard. "Relationship Between the Free Shear Layer, the Wingtip Vortex and Aerodynamic Efficiency." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1470231642.

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Rodrigues, de Melo Costa Verônica [Verfasser]. "Genome-wide Determination Of Splicing Efficiency And Dynamics From RNA-Seq Data / Verônica Rodrigues de Melo Costa." Berlin : Freie Universität Berlin, 2021. http://d-nb.info/1233679244/34.

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47

Okur, Serdal. "Optical characterization of InGaN heterostructures for blue light emitters and vertical cavity lasers: Efficiency and recombination dynamics." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3647.

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OPTICAL CHARACTERIZATION OF INGAN HETEROSTRUCTURES FOR BLUE LIGHT EMITTERS AND VERTICAL CAVITY LASERS: EFFICIENCY AND RECOMBINATION DYNAMICS By Serdal Okur, Ph.D. A thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at Virginia Commonwealth University. Virginia Commonwealth University, 2014. Major Director: Ümit Özgür, Associate Professor, Electrical and Computer Engineering This thesis explores radiative efficiencies and recombination dynamics in InGaN-based heterostructures and their applications as active regions in blue light emitters and par
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CUCCHIARO, SARA. "Assessing sediment dynamics and check dams efficiency in a debris-flow catchment using multi-temporal topographic surveys." Doctoral thesis, Università degli Studi di Trieste, 2019. http://hdl.handle.net/11368/2962385.

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Torrent control works have always been a fundamental tool for preventing torrential hazard in mountain catchments, where the sediment transport phenomena as debris flows are one of the most dangerous geomorphic processes affecting small steep basins. The linkages between sediment source areas on the hillslopes and channel network, along with the temporal and spatial distributions of channel storage, are key controls of debris-flow occurrence and magnitude. Consequently, the prevention of natural hazards related to debris-flows requires a better understanding of sediment dynamic. Among the hydr
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Han, Yilong. "Urban Building Networks' Thermal-Energy Dynamics: Exploring, Mitigating, and Optimizing Inter-Building Effects." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/72956.

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Cities occupy 2% of the earth's surface, and yet consume 75% of the world's resources. As a major contributor to rapidly growing global energy expenditures, urban buildings are often designed and operated inefficiently despite their significant contributions to carbon emissions, triggering environmental deterioration locally and worldwide. Moreover, ongoing industrialization and urbanization pose challenges for achieving a more sustained and resilient built environment. The goal of this PhD research is to advance our understanding of urban building networks' thermal-energy dynamics in order to
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50

Teran, Calle Efrain Andres. "Development of a control system to determine influence of rolling resistance in manual wheelchair dynamics and mechanical efficiency." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52981.

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Wheelchair manufacturers design their products to provide the best possible experience to their users. The user effort and wheelchair mechanical efficiency during motion are highly affected by rolling resistance, which is a resistive force depending on many factors such as vehicle speed, tire/floor materials and tire inflation pressure. The study of this force over several conditions could lead to improvements in wheelchair design. The Anatomical Model Propulsion System (AMPS) is a robotic device to test manual wheelchairs with better repeatability than human subjects, helping to identify the
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