Dissertations / Theses on the topic 'Growth systems'
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Yin, Yang, and Chen Hua. "On chemotaxis systems with saturation growth." Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2009/3025/.
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In this paper, we discuss the global existence of solutions for Chemotaxis models with saturation growth. If the coe±cients of the equations are all positive smooth T-periodic functions, then the problem has a positive T-periodic solution, and meanwhile we discuss here the stability problems for the T-periodic solutions.
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Monaghan, Paul Brendan. "Microfluidic systems for cell growth and assays." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271365.
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Sinclair, Fergus L. "Light interception and growth in agroforestry systems." Thesis, University of Edinburgh, 1995. http://hdl.handle.net/1842/14424.
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While the light regimes of closed forest strands and open pasture have been quantitatively described and modelled, agroforestry involves greater complexity and spatial variability. This research involved intensive measurement of quantum flux density (QFD) above and below re-spaced tree strands of Sitka spruce (Picea sitchensis [Bong.] Carr.) and hybrid larch (Larix x eurolepis Henry) in conjunction with measurement of tree growth. QFD was also measured above and below pasture growing in boxes in imported soil sunk to ground level beneath the trees. The Monteith hypothesis that crop growth in unstressed conditions is linearly related to the amount of QFD intercepted by its canopy was found to hold for above ground growth of trees at agroforestry spacings. The overall dry matter: QFD quotient (e) for Picea sitchensis across the range of tree frequencies was 0.32 g mol-1 which is lower than typical values reported for agricultural crops, young container grown trees of Salix viminalis and Populus trichocarpa and closed-canopy Picea sitchensis, but comparable with previous estimates for a range of mature tree stands. e was unaffected by tree spacing, but was significantly higher for the tall tree stand which had been pruned. The mean annual QFD transmitted to the understorey varied from 39% to 96% of that in the open across the agroforestry treatments. The mean transmittance was similar but spatial variability of QFD was significantly higher in tree stands with crown to ground level when compared with stands having similar crown dimensions but which had been pruned to approximately 1.3 m height. More than 90% of seasonal pasture growth could be explained by a regression of growth on incident QFD.
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Boe-Hansen, Rasmus. "Microbial growth in drinking water distribution systems /." Environment & Resources, DTU, 2001. http://www2.er.dtu.dk/publications/fulltext/2001/MR2001-075.pdf.
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Piper, Victor L. (Victor Lawrence). "Akamai technologies : an analysis of product and platform growth strategies." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/90700.
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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 105-108).
Akamai Technologies has achieved market leadership in content delivery and application acceleration services and is pursuing aggressive growth. Akamai has advised the market that growth to $5B by 2020 is achievable by exploiting opportunity within its key markets. However, the internal consensus is that Akamai's legacy business practices are incapable of scaling at the rate of market growth. What must Akamai do to execute on its revenue goals and, more broadly, how can Akamai maintain a leadership position within a dynamic and rapidly expanding market? The goal of this thesis is to discover the elements of Akamai's legacy and emerging growth strategies and to identify strategic options that Akamai may pursue. To gain perspective into evolution of the business and the rationale for current strategic initiatives, a series of interviews with Akamai managers was conducted and a review of an Akamai case study and corporate quarterly earnings was completed. This information yielded insights on the challenges of growth, actions for overcoming these challenges, and motivations for selecting those actions. To gain insight into best practices in growth strategy, a survey of the business strategy literature and case studies of successful technology platform companies was conducted. The literature differentiated between product-based business strategies and platform-based business strategies. Analysis of the differences between these strategies provided insights into Akamai's current challenges.
by Victor L. Piper.
S.M. in Engineering and Management
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Ravenscroft, John. "The ontology of cognitive systems." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/1537.
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In this thesis, I shall explore the theoretical and empirical expositions regarding the causal mechanisms of cognitive growth. I shall do this in order to determine if biological epistemic theories of cognitive systems can be justified. It will be necessary in this thesis for me to adopt a multidisciplinary stance from Philosophy and Psychology. It will try to investigate from these two perspectives what it means to be a cognitive creature. However, I shall argue, if taken singularly, each standpoint fails to provide an adequate account of cognition that is necessarily based on adaptive, evolutionary constructs. During this thesis I will primarily focus on the major arguments in Philosophy that show a tight coupling between language, cognition and rationality. More specifically I will examine in detail Donald Davidson’s holistic account of what it is to be a rational, cognitive creature. I will show in the thesis, through comparative experimental evidence, that the causal mechanisms of cognitive growth, and thus thought may not be language. Consequently, Philosophical arguments that are based on tight relationships of thought and language will not be able to deliver a true account of cognition. I will demonstrate that Davidson’s philosophy has suffered from not being able to ground his philosophical perspectives on the relationship of language, cognition and rationality within an empirical programme and consequently it makes fundamental errors. Davidson’s account does not take on board the recent (and not so recent) empirical based work on primates which show the possible mechanisms of cognitive growth, which are independent of language. Similarly, I will also show that Psychology, which does provide us with the means to deliver an empirical account of cognition, due to its history based on Behaviourism, does not have the right causal mechanisms nor language to talk about the nature of complex cognition. I will show how Associationistic Psychology mischaracterises what it is to be cognitive and consequently, like philosophy, cannot deliver an accurate ontology of cognition. I intend in this thesis to provide a bridge between the two schools by adopting a comparative psychological approach. By using this comparative perspective, a more accurate theory of cognition may be possible and one that is not contaminated by language or any other cultural symbolic systems. I aim by the end of the thesis to be in a position which will hopefully allow modification of Davidson’s condition on possessing beliefs, a creature must have beliefs about beliefs. This modification will be based on an evolutionary account of what may or may not eventually turn out to be the precursors of higher cognitive states.
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Succaw, Gary Lee. "Dynamics of crystal growth of self-assembling systems /." view abstract or download file of text, 2004. http://wwwlib.umi.com/cr/uoregon/fullcit?p3136448.
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Thesis (Ph. D.)--University of Oregon, 2004.Typescript. Includes vita and abstract. Includes bibliographical references (leaves 209-215). Also available for download via the World Wide Web; free to University of Oregon users.
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Teng, Jing. "Pattern formation and growth kinetics in eutectic systems." [Ames, Iowa : Iowa State University], 2007.
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Stratogiannis, Ioannis A. Zahos Christos K. "Defense industry consolidation and weapon systems cost growth." Monterey, Calif. : Naval Postgraduate School, 2008. http://handle.dtic.mil/100.2/ADA483631.
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Thesis (M.B.A.)--Naval Postgraduate School, June 2008.Thesis Advisor(s): Hensel, Nayantara ; Summers, Don. "June 2008." Description based on title screen as viewed on September 2, 2008. Includes bibliographical references (p. 93-100). Also available in print.
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Golding, Terry David. "Molecular beam epitaxial growth of novel semiconductor systems." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306402.
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Ludlam, Denise. "The growth of roots in sown grassland systems." Thesis, Bangor University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305237.
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Reynal-Querol, Marta. "Ethnic and religious conflicts, political systems and growth." Thesis, London School of Economics and Political Science (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271096.
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This thesis studies the importance of ethnic conflict in explaining the poor economic performance of some countries and the relevance of political institutions to reduce this effect. The first two chapters study the role that each dimension of ethnicity plays in the process of economic development. We cover essentially four issues: first, and in contrast with the ethnic characteristics considered in many studies, this thesis emphasizes the importance of religious conflict in the explanation of economic growth. Second, we consider an index of polarization, instead of the traditional index of fragmentation, in order to measure conflict. We provide a theoretical explanation for the index based on a rent-seeking model approach applied to the behaviour of religious groups. Third, we elaborate a database of religious diversity within countries and finally we analyze the channels through which religious polarization affects growth. This constitutes a new contribution to what has been done until now in the literature that studies the relation between ethnic diversity and economic growth. The main finding is that religious conflict is an important factor in explaining economic growth and it is also an important explanation for the so called "African growth tragedy". Interestingly, when religious diversity measures are included the ethnolinguistic diversity measure employed by Easterly and Levine (1997) turns out to be insignificant suggesting that the former may be more important in explaining the poor economic performance both in Africa and elsewhere. The third chapter analyzes the effect of political systems on preventing or reducing violence. It is generally agreed that a high level of democracy is not a sufficient condition for eliminating the risk of armed conflicts in heterogeneous societies. We show that the combination of the electoral system and the democracy level have a high explanatory power on the probability of a civil war. The reason for the important role of voting rules in preventing armed conflicts is their relative ability to affect the opportunity cost of rebellion. Given a particular level of democracy, countries with majoritarian or presidential systems are more prone to violence than countries with proportional systems where the opportunity cost of rebellion is higher. Therefore it seems that freedom is not a sufficiently effective vaccine against violence, even if it is necessary.
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Zahos, Christos K. "Defense industry consolidation and weapon systems cost growth." Thesis, Monterey, California. Naval Postgraduate School, 2008. http://hdl.handle.net/10945/4017.
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This thesis constitutes a survey of the cost growth of the weapon systems acquired by the U.S. DoD Services. It attempts to assess whether the extensive consolidation of the defense industry has led to any significant reduction of the cost growth. The primary data source for the cost of the weapon systems are the Selected Acquisition Reports (SAR), which are published by the DoD for the major acquisition programs. The time period explored is approximately from 1985 until 2007. An overall assessment of the situation of the defense industry today, because of the consolidation, will be made. The ultimate goal of the project is to attempt to reveal if the consolidation has improved efficiency, in terms of the cost growth, thus being beneficial for the DoD, or if further restructuring of the acquisition system is necessary as a response to the new conditions.
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Holmander, Niklas, and Carl Foglin. "SaaS based CRM systems contribution on SME’s growth." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-27179.
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Whiteman, G. R. "Filamentous and dispersed growth in anaerobic contact systems." Thesis, University of Newcastle Upon Tyne, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354402.
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Macadam, Scott. "Soot surface growth mechanisms in stationary combustion systems." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10410.
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Sharp, Jessica Little. "Managing Cattail (Typha latifolia) Growth in Wetland Systems." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3210/.
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Nutrient availability, water depth, competition, and soil management effects on cattail (Typha latifolia) growth in wetland systems were examined. Soluble reactive phosphorous (SRP), nitrate-nitrogen (NO3-N), and ammonia-nitrogen (NH3-N) removals were tested at a constructed wetland receiving municipal wastewater effluent. Over all, no significant differences in nutrients occurred between diverse planted and cattail areas. T. latifolia seeds, under the canopy of Eleochoris macrostachya, had low seed germination. Established stands of emergent vegetation can prevent cattail colonization and spread. Germination of T. latifolia at various water depths was tested, and depth impacts on cattail seedling growth and survival were ascertained using various moist soil management techniques in three ponds. Water levels at 0cm and >40cm can adversely impact cattail establishment.
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Moulton, Kellen S. "Straightness of Growth for Carbon Nanotube Microelectromechanical Systems." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2413.
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The purpose of this research is to examine the effect of iron catalyst thickness on the straightness of growth of carbon nanotube microelectromechanical systems (CNT-MEMS). One of the key benefits of CNT-MEMS is that they can potentially have very high aspect ratios. One of the challenges in attaining these high aspect ratios is maintaining device straightness; as these devices get taller, the edges tend to curve rather than grow straight vertically. Scanning electron mi- croscope images of samples grown using various iron catalyst thicknesses show that both straight growth and relatively good edge definition can be achieved using iron thicknesses between 7 and 8 nm. Below this thickness, individual CNT are well-aligned, but CNT forests are not necessarily straight. Above this thickness, the CNT forests are relatively straight, but individual CNT are not well-aligned and edge definition is very poor. Iron availability for CNT growth is also affected by a device's or feature's proximity to other regions of iron. By using an iron catalyst thickness ap- propriate for straight growth, and by adding borders of iron around features or devices, a designer can greatly improve straightness of growth for CNT-MEMS.
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Yu, Xiaoling. "INSTITUTIONAL LEARNING IN ECONOMIC GROWTH: AN INNOVATION SYSTEMS APPROACH." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1347892629.
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Ahmad, Mohammad Najeeb. "Mathematical modelling of fermentation systems." Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296797.
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Quigley, John Leckie. "Managing information from a reliability growth development programme." Thesis, University of Strathclyde, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249876.
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Halbach, Rachel Beverly. "Weed growth in conventional and low-input cropping systems." [Ames, Iowa : Iowa State University], 2010. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1475925.
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Fontenot, Kevin. "Nucleation and growth in mini/macro emulsion polymerization systems." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/10922.
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Grando, Gianluca. "Growth fold systems in deep water fold thrust belts." Thesis, Royal Holloway, University of London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417783.
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Kaba'ah, Mohammad Lafi Mohammad. "Intensification of polychaete worm culture in engineered growth systems." Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/2867.
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Hall, J. Brian. "Methodology for evaluating reliability growth programs of discrete systems." College Park, Md. : University of Maryland, 2008. http://hdl.handle.net/1903/8129.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Stern, Jennifer E. Seinfeld John H. "Aerosol formation and growth in aromatic hydrocarbon/NOx systems /." Diss., Pasadena, Calif. : California Institute of Technology, 1988. http://resolver.caltech.edu/CaltechETD:etd-12282004-153051.
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Wang, Shih-chen Flagan Richard C. "Aerosol formation and growth in atmospheric organic/NOx systems /." Diss., Pasadena, Calif. : California Institute of Technology, 1991. http://resolver.caltech.edu/CaltechETD:etd-01112007-152148.
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Brusnahan, Matthew Daniel. "Minigrids for electrification : policies to promote industry growth." Thesis, Massachusetts Institute of Technology, 2018. https://hdl.handle.net/1721.1/122201.
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Thesis: S.M. in Technology and Policy, Massachusetts Institute of Technology, School of Engineering, Institute for Data, Systems, and Society, 2018Cataloged from PDF version of thesis.
Includes bibliographical references (pages 63-65).
The International Energy Agency estimates $331 billion dollars will be invested over the next 12 years to provide energy access to the 1.1 billion people who currently lack access to reliable electricity service. Of the $331 billion, the IEA estimates that 34% of this capital will be directed towards minigrid systems. In line with these capital estimates, governments in many countries with low levels of electricity service are undertaking significant capital expenditures in order to expand the existing electricity infrastructure. However, this capital is limited and will not be sufficient to provide universal access. One proposed solution to overcome limited government budgets and capacity is to allow off-grid and minigrid services in areas which will not be reached by government-led programs. This thesis utilizes a computer-based simulation model to explore how minigrid developers respond to commercial, industrial, and residential customers and the type of service these minigrid developers may choose to provide to these customers. The effect of government policies and subsidies is incorporated into the developed simulation model to judge the effect of these policies on firm behavior. The simulation results find that if governments are to prioritize universal access to rural households, specific policy measures must be put in place to encourage minigrid developers to provide service to low-income consumers.
by Matthew Daniel Brusnahan.
S.M. in Technology and Policy
S.M.inTechnologyandPolicy Massachusetts Institute of Technology, School of Engineering, Institute for Data, Systems, and Society
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Hawick, Kenneth Arthur. "Domain growth in alloys." Thesis, University of Edinburgh, 1991. http://hdl.handle.net/1842/10605.
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This thesis describes Monte-Carlo computer simulations of binary alloys, with comparisons between small angle neutron scattering (SANS) data, and numerically integrated solutions to the Cahn-Hilliard-Cook (CHC) equation. Elementary theories for droplet growth are also compared with computer simulated data. Monte-Carlo dynamical algorithms are investigated in detail, with special regard for universal dynamical times. The computer simulated systems are Fourier transformed to yield partial structure functions which are compared with SANS data for the binary Iron-Chromium system. A relation between real time and simulation time is found. Cluster statistics are measured in the simulated systems, and compared to droplet formation in the Copper-Cobalt system. Some scattering data for the complex steel PE16 is also discussed. The characterisation of domain size and its growth with time are investigated, and scaling laws fitted to real and simulated data. The simple scaling law of Lifshitz and Slyozov is found to be inadequate, and corrections such as those suggested by Huse, are necessary. Scaling behaviour is studied for the low-concentration nucleation regime and the high-concentration spinodal-decomposition regime. The need for multi-scaling is also considered. The effect of noise and fluctuations in the simulations is considered in the MonteCarlo model, a cellular-automaton (CA) model and in the Cahn-Billiard-Cook equation. The Cook noise term in the CHC equation is found to be important for correct growth scaling properties.
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Heberley, Christine L. (Christine Laura), and Matthew F. Hoover. "Managing growth of a non-profit healthcare supply chain in Haiti." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/60835.
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Thesis (M. Eng. in Logistics)--Massachusetts Institute of Technology, Engineering Systems Division, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 69).
Partners in Health's (PIH) supply chain in Haiti has become strained over the past five years due to the organization's rapid growth. Under the current system, the majority of PIH's products are obtained through an annually placed order. All goods from this order are stored at the central warehouse in Cange, which acts as a hub, until those goods are needed at individual clinics. As annual orders increase in size to support PIH's expanding operations, the limited size of the central warehouse has become a constraint, making a change in current inventory policies necessary. In order to formulate revised inventory policies for PIH's Haiti operations, we developed a spreadsheet model that uses historical consumption data of drugs and medical supplies to forecast demand over the next three years. This demand data is then be used as input to run and compare the existing annual order policy with ordering policies with more frequent reviews. These inventory policies are then evaluated against the central warehouse size constraints to recommend an inventory policy better suited to meet PIH's needs. We find that more frequent orders drastically reduces warehouse space requirements while maintaining high service levels. It is hoped that PIH can continue to use this model to determine future inventory policy needs.
by Christine L. Heberley and Matthew F. Hoover.
M.Eng.in Logistics
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Harris, Robert Jason. "Protoplanetary Disks in Multiple Star Systems." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11194.
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Most stars are born in multiple systems, so the presence of a stellar companion may commonly influence planet formation. Theory indicates that companions may inhibit planet formation in two ways. First, dynamical interactions can tidally truncate circumstellar disks. Truncation reduces disk lifetimes and masses, leaving less time and material for planet formation. Second, these interactions might reduce grain-coagulation efficiency, slowing planet formation in its earliest stages.Astronomy
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Martin, Marcus R. W. "On scalar growth systems governed by delayed nonlinear negative feedback." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963073605.
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Salmins, Sandra S. (Sandra Sylvia). "Apple tree growth and yield in alternative ground management systems." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68256.
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Dwarf apple tree growth and yield under several non-herbicidal ground management systems were compared. Six ground cover systems were established in two newly planted orchards. After two growing seasons, trees in the straw mulch and geotextile mulch treatments had larger trunk cross-sectional areas and more shoot growth than trees in the red fescue and insectary plant cover treatments. Growth of trees under the manure mulch and cultivation treatments was intermediate. When four of the systems were established along rows of five-year old trees in an existing orchard, the increase in trunk cross-sectional area over two growing seasons was greatest for trees in the manure mulch and straw mulch followed by tose in geotextile mulch, trees in the red fescue grew least. The use of a mulch, such as straw or geotextile, has a favourable effect on growth and has potential for use in organic orchards.
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Guven, Basak. "Modelling the growth and movement of cyanobacteria in river systems." Thesis, University of Reading, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428865.
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Leuyacc, Yony Raúl Santaria. "On Hamiltonian elliptic systems with exponential growth in dimension two." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/55/55135/tde-02082017-150001/.
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In this work we study the existence of nontrivial weak solutions for some Hamiltonian elliptic systems in dimension two, involving a potential function and nonlinearities which possess maximal growth with respect to a critical curve (hyperbola). We consider four different cases. First, we study Hamiltonian systems in bounded domains with potential function identically zero. The second case deals with systems of equations on the whole space, the potential function is bounded from below for some positive constant and satisfies some integrability conditions, while the nonlinearities involve weight functions containing a singulatity at the origin. In the third case, we consider systems with coercivity potential functions and nonlinearities with weight functions which may have singularity at the origin or decay at infinity. In the last case, we study Hamiltonian systems, where the potential can be unbounded or can vanish at infinity. To establish the existence of solutions, we use variational methods combined with Trudinger-Moser type inequalities for Lorentz-Sobolev spaces and a finite-dimensional approximation.Neste trabalho estudamos a existência de soluções fracas não triviais para sistemas hamiltonianos do tipo elíptico, em dimensão dois, envolvendo uma função potencial e não linearidades tendo crescimento exponencial máximo com respeito a uma curva (hipérbole) crítica. Consideramos quatro casos diferentes. Primeiramente estudamos sistemas de equações em domínios limitados com potencial nulo. No segundo caso, consideramos sistemas de equações em domínio ilimitado, sendo a função potencial limitada inferiormente por alguma constante positiva e satisfazendo algumas de integrabilidade, enquanto as não linearidades contêm funções-peso tendo uma singularidade na origem. A classe seguinte envolve potenciais coercivos e não linearidades com funções peso que podem ter singularidade na origem ou decaimento no infinito. O quarto caso é dedicado ao estudo de sistemas em que o potencial pode ser ilimitado ou decair a zero no infinito. Para estabelecer a existência de soluções, utilizamos métodos variacionais combinados com desigualdades do tipo Trudinger-Moser em espaços de Lorentz-Sobolev e a técnica de aproximação em dimensão finita.
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Fradinho, Maria João de Sousa Ferreira Martelo. "Growth and development of the Lusitano foal on extensive systems." Doctoral thesis, Universidade de Lisboa. Faculdade de Medicina Veterinária, 2016. http://hdl.handle.net/10400.5/11426.
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Tese de Doutoramento em Ciências Veterinárias, especialidade de Produção AnimalThe general aim of this study was to characterize the growth and development of the Lusitano foal bred and raised on extensive systems. In particular, the relationship between growth patterns and bone quality was evaluated. Additionally, nutritional status and body condition (BC) changes of the mares during the productive cycle were studied, in order to stablish appropriate scores to optimize the development of foals from pregnancy to weaning, as well as to increase the productive efficiency of the system. A longitudinal field study was conducted in four Lusitano stud-farms. Broodmares were monitored during three consecutive gestation/lactation cycles and foals were followed from birth to 42 months of age. The biomechanical properties of equine cortical bone were also assessed. Results showed that changes in broodmare body weight (BW) and BC were mainly influenced by pasture availability and quality and when the foaling season occurs in the year. The reproductive performance of mares and the growth of suckling foals were also clearly influenced by broodmare nutritional status. BC score changes at mating had a strong effect on fertility outcome of the first two estrous cycles after foaling, being highly impaired by BCS negative changes, whatever the BCS. Best fertility results were obtained with positive and greater BC changes. The Richards function was used to characterize foals’ growth patterns and growth curves were obtained for BW, withers height (WH), girth and cannon circumference. Lusitano foals showed slower BW growth rates, comparable with moderate growth levels proposed for other sport breeds. In contrast, WH growth rates were similar to those presented by early maturing breeds. The validity of the quantitative ultrasonoghraphy as a non-invasive method for the in vivo assessment of bone mechanical properties and overall bone quality was also demonstrated. Changes in foals BW and WH growth rates were associated with the presence of radiographic findings compatible with osteochondrosis (OC) lesions at the onset of training. When compared to healthy foals, OC positive foals seem to be early maturing as regards to BW, and showed a tendency for worse cortical bone quality, lower IGF-I and higher insulin and PTH concentrations. The results underline the importance of an early monitoring of foals’ growth during the first year of life in order to avoid sudden changes to the average growth rates and to promote a better osteoarticular quality of the Lusitano horse. The integrated approach in what concerns mares and foals management decisions, in particular the choice of the foaling season and the introduction of adequate feeding strategies, will be determinant for the improvement of the efficiency and profitability of the Lusitano production systems.
RESUMO - O crescimento e desenvolvimento do poldro de raça Lusitana em sistemas extensivos - O presente estudo teve como principal objectivo a caracterização do crescimento e do desenvolvimento do poldro de raça Lusitana, em sistemas extensivos. Em particular, foi avaliada a relação entre os padrões de crescimento e a qualidade do tecido ósseo. O estado nutricional e evolução da condição corporal (CC) das éguas de ventre ao longo do ciclo produtivo foram igualmente estudados, no sentido de estabelecer os índices mais adequados à optimização do desenvolvimento dos poldros desde a gestação até ao desmame, bem como de aumentar a eficiência produtiva do sistema. Para o efeito foi realizado um trabalho de campo longitudinal, no qual foram acompanhados animais pertencentes a quatro coudelarias. As éguas foram avaliadas durante três ciclos produtivos (gestação/lactação) consecutivos e os poldros foram seguidos desde o desmame aos 42 meses de idade. Paralelamente foram também estudadas as propriedades biomecânicas do osso cortical do cavalo. As variações do peso vivo (PV) e da CC das éguas ao longo do ciclo produtivo foram sobretudo influenciadas pela disponibilidade e qualidade da pastagem e pela época de parto. O desempenho reprodutivo das éguas e o crescimento dos poldros lactentes foram afectados pelo estado nutricional das éguas. A variação da CC no período correspondente à cobrição teve um forte efeito na fertilidade dos dois primeiros estros, sendo esta claramente prejudicada por variações negativas da CC, independentemente da nota observada. As melhores taxas de fertilidade foram obtidas com variações positivas e mais elevadas de CC. A função de Richards foi utilizada na caracterização dos padrões de crescimento dos poldros, tendo sido obtidas curvas de crescimento para o PV, altura ao garrote (AG), perímetro torácico e perímetro da canela. No que se refere ao PV, os poldros Lusitanos apresentaram taxas de crescimento mais lentas, podendo enquadrar-se nos valores propostos para um crescimento moderado em outras raças de desporto. No entanto, as taxas de crescimento para a AG foram semelhantes às observadas em raças mais precoces. A ultrasonografia quantitativa foi confirmada como técnica não invasiva para a avaliação das propriedades biomecânicas e da qualidade do osso cortical em geral. A presença de sinais radiográficos de osteocondrose (OC) ao desbaste foi associada a alterações nas taxas de crescimento (PV e AG) dos poldros. Para além de apresentarem um índice de maturidade mais elevado para o PV, os poldros com OC revelaram uma tendência para uma menor qualidade do osso cortical, menores concentrações de IGF-I e concentrações mais elevadas de insulina e de PTH. Os resultados obtidos apontam para a importância de uma monitorização precoce do crescimento dos poldros, em particular durante o primeiro ano de vida, no sentido de evitar alterações súbitas das taxas médias de crescimento e de promover uma melhor qualidade osteoarticular no cavalo Lusitano. A abordagem integrada das opções de maneio nas éguas e nos poldros, em particular no que se refere a uma melhor gestão da época de partos e à introdução de estratégias alimentares adequadas, será determinante para a melhoria da eficiência e da produtividade dos sistemas de produção do cavalo Lusitano.
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Melo, Júnior José Carlos de Albuquerque. "On linearly coupled systems of Schrödinger equations with critical growth." Universidade Federal da Paraíba, 2017. http://tede.biblioteca.ufpb.br:8080/handle/tede/9316.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
In thisworkwestudytheexistenceofgroundstatesforthefollowingclassofcoupled systems involvingnonlinearSchrödingerequations 8<: u + V1(x)u = f1(x; u) + (x)v;x 2 RN; v + V2(x)v = f2(x; v) + (x)u; x 2 RN; where thepotentials V1 : RN ! R, V2 : RN ! R are nonnegativeandrelatedwith the couplingterm : RN ! R by j (x)j < pV1(x)V2(x), forsome 0 < < 1. In the case N = 2, thenonlinearities f1 e f2 havecriticalexponentialgrowthinthesense of Trudinger-Moserinequality.Inthecase N 3, thenonlinearitiesarepolynomials with subcriticalandcriticalexponentintheSobolevsense.Westudyalsothefollowing class ofnonlocalcoupledsystems 8<: ( )1=2u + V1(x)u = f1(u) + (x)v;x 2 R; ( )1=2v + V2(x)v = f2(v) + (x)u; x 2 R; where ( )1=2 denotes thesquarerootoftheLaplacianoperatorandthenonlinearities havecriticalexponentialgrowth.Ourapproachisvariationalandbasedon minimization techniqueovertheNeharimanifold
Neste trabalhoestudamosaexistênciadegroundstatesparaaseguinteclassede sistemas acopladosenvolvendoequaçõesdeSchrödingernão-lineares 8<: u + V1(x)u = f1(x; u) + (x)v;x 2 RN; v + V2(x)v = f2(x; v) + (x)u; x 2 RN; onde ospotenciais V1 : RN ! R, V2 : RN ! R são não-negativoseestãorelacionados com otermodeacomplamento : RN ! R por j (x)j < pV1(x)V2(x), paraalgum 0 < < 1. Nocaso N = 2, asnão-linearidades f1 e f2 possuemcrescimentocrítico exponencialnosentidodadesigualdadedeTrudinger-Moser.Nocaso N 3, asnão- linearidades sãopolinômioscomexpoentesubcríticoecríticonosentidodeSobolev. Estudamos aindaaseguinteclassedesistemasacopladosnão-locais 8<: ( )1=2u + V1(x)u = f1(u) + (x)v;x 2 R; ( )1=2v + V2(x)v = f2(v) + (x)u; x 2 R; onde ( )1=2 denota ooperadorraízquadradadolaplacianoeasnão-linearidades possuemcrescimentocríticoexponencial.Nossaabordagemévariacionalebaseadana técnica deminimizaçãosobreavariedadedeNehari.
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DeRose, Haley Nicole. "Coconut Coir as a Vertical Textile in Soilless Growth Systems." Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent1619537140131192.
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M'Bayia, Caliste Claude. "System thinking approach to economic growth and poverty reduction in Cote d'Ivoire." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/106233.
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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, School of Engineering, System Design and Management Program, Engineering and Management Program, 2015.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 96-99).
The present thesis work aims to propose a pathway to a sustainable economic growth and a fast reduction of poverty in Cote d'Ivoire. Poverty is a major social phenomenon that affects more than 50% of the world's population. In Cote d'Ivoire, 49% of the population is living under the poverty line with less than $1.25 a day, and the country is struggling to lift them out of poverty. But poverty is a complex issue to tackle. One solution, which most experts now agree on, consists in enhancing prosperity through the implementation of economic growth policies. The question this research aims to address is to know what specific growth policies would best suit to the social, economical, cultural and environmental situation of Cote d'Ivoire. The main lesson is that Cote d'Ivoire should focus on the development of its agricultural sector and build an agriculture innovation system that will foster the transfer of knowledge and the adoption of new technologies especially in the country's rural areas. This thesis work is original in that it uses systems thinking approach and systems engineering concepts and tools, to address the issues of economic growth and poverty reduction. By doing so, it brings new insights that increase the chances of success of the National Development Plan of Cote d'Ivoire and therefore contributes to the materialization of the country's ambition to become an emerging nation by 2020.
by Caliste Claude M'Bayia.
S.M. in Engineering and Management
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Bonde, Åkerlind Ingrid Gudrun. "Driving change : evaluating strategies to control automotive energy demand growth in China." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81114.
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Thesis (S.M. in Technology and Policy)--Massachusetts Institute of Technology, Engineering Systems Division, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 111-122).
As the number of vehicles in China has relentlessly grown in the past decade, the energy demand, fuel demand and greenhouse gas emissions associated with these vehicles have kept pace. This thesis presents a model to project future energy demand, fuel demand and carbon dioxide emissions for the Chinese light duty vehicle fleet. Results indicate that China can offset rapid vehicle energy demand growth with reductions in fuel consumption and new vehicle technologies. These reference scenario results indicate that future light duty vehicle energy demand and carbon dioxide emissions will peak below 400 mtoe and 1700 mmt carbon dioxide, respectively. In addition, a scenario based sensitivity analysis reveals that vehicle stock, vehicle fuel consumption and vehicle fleet electrification are the most significant drivers in determining future light duty vehicle energy demand, fuel demand and carbon dioxide emissions. The Chinese government is concerned with these trends. In a complementary analysis, I investigate existing government policy strategies that may affect future automotive energy demand. I find that policy strategies are fairly well aligned with the significant drivers to reduce automotive energy demand. However, I also find that national government policies are often not implemented as intended at the local government level. Finally, I analyze current domestic and joint venture brand vehicle technology, where I find that domestic car technology lags joint venture car technology.
by Ingrid Gudrun Bonde Åkerlind.
S.M.in Technology and Policy
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Castellano, Katherine Elizabeth. "Unpacking student growth percentiles: statistical properties of regression-based approaches with implications for student and school classifications." Diss., University of Iowa, 2011. https://ir.uiowa.edu/etd/931.
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The measurement of achievement growth raises many challenges, including how to define "growth" and select or develop a growth measure that captures that definition. Despite these complications, current federal educational policies focus on student growth measures for accountability purposes. Student growth percentiles (SGPs) are one metric developed under these policies. They use quantile regression to produce normative growth interpretations: They describe how much a student has grown relative to students with similar past test scores. SGPs are increasingly popular, but there are gaps in the literature concerning their performance for small sample sizes and the number of prior years of test scores included in the model, as well as their invariance to transformations of the test scale.
This study proposes an ordinary least squares analog, the percentile rank of residuals (PRRs). PRRs are the percentile rank of the residuals found by regressing the current grade-level assessment score on past grade-level assessment scores. PRRs may be a more robust alternative to SGPs, especially for small samples. They also stem from a wide array of regression based metrics in education and only require estimation of one regression line, as opposed to the 100 regression lines estimated for SGPs.
This dissertation first places the growth metrics of interest in a framework anchored by four key contrasts in growth interpretations: (1) absolute versus normative, (2) unconditional normative versus conditional normative, (3) student- versus group-level, and (4) aggregated individual growth versus growth of aggregated-individuals. SGPs and PRRs afford normative conditional growth interpretations. They are investigated at the student level using simulated multivariate normal data and two statewide empirical datasets. These student-level analyses assess the accuracy of SGPs and PRRs by their recovery of benchmark growth percentiles under multivariate normality, or normal conditional growth percentiles (NCGPs), their robustness to scale transformations, their comparability to each other under varying conditions, and their stability over different sample sizes and numbers of prior years included in the models. SGPs and PRRs are also investigated at the group level by aggregating them with the mean and median functions. The robustness of the aggregated growth percentiles to test scale transformations is also assessed. Finally, the aggregated growth percentiles are contrasted against group effects from a simple layered value-added model (VAM).
The analyses found that PRRs better recover expected growth percentiles under multivariate normality and are more accurate and stable for small samples, whereas SGPs are substantially more robust to test scale transformations. However, estimation issues with the SGPs can cause students with extreme initial statuses to obtain substantially different SGPs under transformations of the data. At the aggregate level, there is little distinction in how robust SGPs and PRRs are to scale transformations of the test score data. The mean SGPs and mean PRRs are consistently more robust to scale transformations of the test score data then their median counterparts. They are also the most highly correlated and rank order the groups more similarly to the value-added school effects than the median SGPs and PRRs.
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Wheatley, S. D. "Compensatory growth : The responses associated with feed restriction and subsequent refeeding." Thesis, University of Reading, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380837.
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Weng, Yaochung. "Measuring the effects of drugs on single cancer cell growth." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/72638.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Computational and Systems Biology Program, 2012.This 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.
Understanding the effectiveness of a drug therapy on halting disease progression is an essential aspect of cancer biology. Conventional assays that study cell behavior after a drug intervention report the average response of a cell population which can mask the heterogeneity and dynamics of seemingly identical cells. Recently, many single-cell techniques have been developed, but there are currently no methods that can fully characterize the long-term effects of drug treatment on cancer cell growth. To accomplish such, we developed an instrument to measure single-cell growth before and after drug treatment. In order to achieve femtogram-level mass resolution, we employed the suspended microchannel resonator (SMR), a vacuum-packaged cantilever with an embedded channel. Here, we describe three implementations that involve different technologies (optical trap, mechanical trap, and dynamic ow trapping) to capture a cell for repeated measurements and to perform drug delivery. Applying the technique we developed based on the dynamic ow trapping, we were able to monitor one or more generations of a cancer cell before and after drug treatment. We investigated the growth of mouse leukemia cells in response to drugs that inhibit the mammalian target of rapamycin (mTOR) pathway, induce apoptosis, or prevent translational activity directly at the ribosome. Our method was able to discern a particular growth signature for each drug investigated and to discover a new phenotype in cells following mTOR inhibition. Furthermore, our data demonstrates that the instantaneous growth rate changes following a drug treatment could potentially predict the long-term inhibitory effect on cellular biogenesis and mass accumulation.
by Yaochung Weng.
Ph.D.
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ROBINSON, DAVID GERALD. "MODELING RELIABILITY IMPROVEMENT DURING DESIGN (RELIABILITY GROWTH, BAYES, NON PARAMETRIC)." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183971.
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Past research into the phenomenon of reliability growth has emphasised modeling a major reliability characteristic in terms of a specific parametric function. In addition, the time-to-failure distribution of the system was generally assumed to be exponential. The result was that in most cases the improvement was modeled as a nonhomogeneous Poisson process with intensity λ(t). Major differences among models centered on the particular functional form of the intensity function. The popular Duane model, for example, assumes that λ(t) = β(1 – α)t ⁻ᵅ. The inability of any one family of distributions or parametric form to describe the growth process resulted in a multitude of models, each directed toward answering problems encountered with a particular test situation. This thesis proposes two new growth models, neither requiring the assumption of a specific function to describe the intensity λ(t). Further, the first of the models only requires that the time-to-failure distribution be unimodal and that the reliability become no worse as development progresses. The second model, while requiring the assumption of an exponential failure distribution, remains significantly more flexible than past models. Major points of this Bayesian model include: (1) the ability to encorporate data from a number of test sources (e.g. engineering judgement, CERT testing, etc.), (2) the assumption that the failure intensity is stochastically decreasing, and (3) accountability of changes that are incorporated into the design after testing is completed. These models were compared to a number of existing growth models and found to be consistently superior in terms of relative error and mean-square error. An extension to the second model is also proposed that allows system level growth analysis to be accomplished based on subsystem development data. This is particularly significant, in that, as systems become larger and more complex, development efforts concentrate on subsystem levels of design. No analysis technique currently exists that has this capability. The methodology is applied to data sets from two actual test situations.
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Pafford, Michael E., and Lyle V. Munn. "A comparison of information systems and non-information systems personnel working in non-information systems organizational departments." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/24277.
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A survey was conducted to investigate motivational and satisfaction differences between Information Systems (IS) and non-IS personnel working in various non-IS organizational departments. The motivational factors of Motivating Potential Score (MPS), Growth Need Strength (GNS), Social Need Strength (SNS), Average Psychological Score (APS), and Overall Satisfaction Score (OSS) were measured. Control for occupational group differences was achieved by classifying survey respondents into one of two job categories: Managerial or Professional/Technical. Significant differences were found in the GNS scores and SNSs of the two job categories. Several implications of the research findings are discussed and recommendations are made with respect to future studies.
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Tanaka, Toshiyuki. "Control of growth dynamics of feed-forward neural network." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/13445.
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Pierrakakis, Kyriakos. "The sustainable growth paradigm : implications for technology and policy." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/52757.
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Thesis (S.M. in Technology and Policy)--Massachusetts Institute of Technology, Engineering Systems Division, Technology and Policy Program, 2009.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (leaves 102-109).
While some scholars continue to insist that the concept of sustainability is vague and unwieldy, this thesis seeks to explore multidimensional elements of sustainability and seeks to offer an integrative, transdisciplinary approach to policy design for its attainment. Sustainability and the related concepts of development, globalization, and economic and environmental justice are interwoven with technological, social and institutional change, and with trade as drivers of the transformation of industrial and industrializing societies. The discussion begins by an analysis of the dominant existing models of economic growth and innovation and advances to the effects of economic growth on sustainability. Included is an analysis of the limits of the GDP growth paradigm, the effects of growth on the developed and the developing world and the relationship between economic growth and ecological collapse. The focus of analysis then shifts from the domestic to the international. Trade and the International Financial System are examined both with respect to their primary theories and characteristics, but also in relation to their effects to sustainability. The discussion is then concluded by an examination of the different policy options and analytical tools that could be employed for a transition to a more sustainable economic model.
by Kyriakos Pierrakakis.
S.M.in Technology and Policy
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Fathi, Aghdam Faranak. "Nanowire Growth Process Modeling and Reliability Models for Nanodevices." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/612823.
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Nowadays, nanotechnology is becoming an inescapable part of everyday life. The big barrier in front of its rapid growth is our incapability of producing nanoscale materials in a reliable and cost-effective way. In fact, the current yield of nano-devices is very low (around 10 %), which makes fabrications of nano-devices very expensive and uncertain. To overcome this challenge, the first and most important step is to investigate how to control nano-structure synthesis variations. The main directions of reliability research in nanotechnology can be classified either from a material perspective or from a device perspective. The first direction focuses on restructuring materials and/or optimizing process conditions at the nano-level (nanomaterials). The other direction is linked to nano-devices and includes the creation of nano-electronic and electro-mechanical systems at nano-level architectures by taking into account the reliability of future products. In this dissertation, we have investigated two topics on both nano-materials and nano-devices. In the first research work, we have studied the optimization of one of the most important nanowire growth processes using statistical methods. Research on nanowire growth with patterned arrays of catalyst has shown that the wire-to-wire spacing is an important factor affecting the quality of resulting nanowires. To improve the process yield and the length uniformity of fabricated nanowires, it is important to reduce the resource competition between nanowires during the growth process. We have proposed a physical-statistical nanowire-interaction model considering the shadowing effect and shared substrate diffusion area to determine the optimal pitch that would ensure the minimum competition between nanowires. A sigmoid function is used in the model, and the least squares estimation method is used to estimate the model parameters. The estimated model is then used to determine the optimal spatial arrangement of catalyst arrays. This work is an early attempt that uses a physical-statistical modeling approach to studying selective nanowire growth for the improvement of process yield. In the second research work, the reliability of nano-dielectrics is investigated. As electronic devices get smaller, reliability issues pose new challenges due to unknown underlying physics of failure (i.e., failure mechanisms and modes). This necessitates new reliability analysis approaches related to nano-scale devices. One of the most important nano-devices is the transistor that is subject to various failure mechanisms. Dielectric breakdown is known to be the most critical one and has become a major barrier for reliable circuit design in nano-scale. Due to the need for aggressive downscaling of transistors, dielectric films are being made extremely thin, and this has led to adopting high permittivity (k) dielectrics as an alternative to widely used SiO₂ in recent years. Since most time-dependent dielectric breakdown test data on bilayer stacks show significant deviations from a Weibull trend, we have proposed two new approaches to modeling the time to breakdown of bi-layer high-k dielectrics. In the first approach, we have used a marked space-time self-exciting point process to model the defect generation rate. A simulation algorithm is used to generate defects within the dielectric space, and an optimization algorithm is employed to minimize the Kullback-Leibler divergence between the empirical distribution obtained from the real data and the one based on the simulated data to find the best parameter values and to predict the total time to failure. The novelty of the presented approach lies in using a conditional intensity for trap generation in dielectric that is a function of time, space and size of the previous defects. In addition, in the second approach, a k-out-of-n system framework is proposed to estimate the total failure time after the generation of more than one soft breakdown.
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Brodhag, Sabine H. "Static grain growth in polyphase systems : insights from nature and experiments /." [S.l.] : [s.n.], 2009. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
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