Дисертації з теми "System solutions"
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1
Natali, Andrea. "Double Dyke System - Natural engineering solutions." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21243/.
Повний текст джерелаАнотація:
According to various studies, the effects of climate change will be a danger to ecosystems and the population, especially in coastal areas, increasing the risk of floods. Authorities are taking action to prevent future disasters using traditional engineering solutions. These solutions can have high environmental and economic costs, fixing the coastline, increasing the salinization of aquifers, and can be subject to failure mechanisms.
For this reason, studies were made to use natural engineering solutions for coastal protection, instead of traditional solutions, to achieve the UN SDGs. Coastal ecosystems have the natural ability to repair and restore themselves, increasing soil elevation, and attenuating waves. One of these solutions is the Double Dyke System, consisting of creating a salt marsh between the first dyke and a second inland. The goal is to protect the coasts and to restore ecosystems.
The purpose of this study is to compare the costs of natural engineering solutions with traditional ones. It is assumed that these solutions may be more effective and less expensive in the long run. For this evaluation, a suitability analysis of the polders in the Dutch Zeeland region to assess the costs and benefits under different SLR scenarios was made. A saline intrusion model was also created to analyze the effects of a salt marsh on the aquifers. From the analyzes conducted, the implementation of the DDS turns out to be the cheapest coastal defense system in all SLR scenarios. The presence of a salt marsh could also have a positive impact on the prevention of saline intrusion in the various scenarios considered.
The DDS could have a positive economic and environmental impact in the long term, reducing the investment costs for coastal defense and bringing important benefits for the protection of man and nature.
Despite the results, more studies are needed on the efficiency of this defense system and on the economic evaluation of non-marketable ecosystem services.
2
Pay, Susan. "Series solutions of the Hénon-Heiles system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ27057.pdf.
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Pay, Susan Carleton University Dissertation Mathematics and Statistics \. "Series solutions of the Henon-Heiles system." Ottawa, 1997.
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Fung, Tat-ching. "Steady state solutions of nonlinear dynamic systems /." [Hong Kong] : University of Hong Kong, 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12760055.
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Alves, Victor César Costa [UNESP]. "Painlevé Integrability and mixed P_III-P_V system solutions." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/149963.
Повний текст джерелаАнотація:
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O presente trabalho trata de um abordagem de aplicações em física dos métodos matemáticos de integrabilidade de Painlevé, por outro lado também aborda o formalismo de hierarquias integráveis e o modelo de 2M-bosons onde são usados métodos de equações diferenciais bem como um método para soluções usando aproximantes de Padé.
The current work aims at applications of mathematical methods of Painlevé integrability in physics, on the other side it also approaches the integrable hierarchies formalism and the 2M-bose model where differential equations methods are used as well as a method for solutions using Padé approximants.
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Alves, Victor César Costa. "Painlevé Integrability and mixed P_III-P_V system solutions /." São Paulo, 2017. http://hdl.handle.net/11449/149963.
Повний текст джерелаАнотація:
Orientador: Abraham Hirsz ZimermanAbstract: The current work aims at applications of mathematical methods of Painlevé integrability in physics, on the other side it also approaches the integrable hierarchies formalism and the 2M-bose model where differential equations methods are used as well as a method for solutions using Padé approximants.
Resumo: O presente trabalho trata de um abordagem de aplicações em física dos métodos matemáticos de integrabilidade de Painlevé, por outro lado também aborda o formalismo de hierarquias integráveis e o modelo de 2M-bosons onde são usados métodos de equações diferenciais bem como um método para soluções usando aproximantes de Padé.
Mestre
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Cameretti, Luca F. "Modeling of thermodynamic properties in biological solutions." Göttingen Cuvillier, 2008. http://d-nb.info/992302749/04.
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Reyes, Eumir P. (Eumir Paulo Reyes Morales). "A systems thinking approach to business intelligence solutions based on cloud computing." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59267.
Повний текст джерелаАнотація:
Thesis (S.M. in System Design and Management)--Massachusetts Institute of Technology, Engineering Systems Division, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 73-74).
Business intelligence is the set of tools, processes, practices and people that are used to take advantage of information to support decision making in the organizations. Cloud computing is a new paradigm for offering computing resources that work on demand, are scalable and are charged by the time they are used. Organizations can save large amounts of money and effort using this approach. This document identifies the main challenges companies encounter while working on business intelligence applications in the cloud, such as security, availability, performance, integration, regulatory issues, and constraints on network bandwidth. All these challenges are addressed with a systems thinking approach, and several solutions are offered that can be applied according to the organization's needs. An evaluations of the main vendors of cloud computing technology is presented, so that business intelligence developers identify the available tools and companies they can depend on to migrate or build applications in the cloud. It is demonstrated how business intelligence applications can increase their availability with a cloud computing approach, by decreasing the mean time to recovery (handled by the cloud service provider) and increasing the mean time to failure (achieved by the introduction of more redundancy on the hardware). Innovative mechanisms are discussed in order to improve cloud applications, such as private, public and hybrid clouds, column-oriented databases, in-memory databases and the Data Warehouse 2.0 architecture. Finally, it is shown how the project management for a business intelligence application can be facilitated with a cloud computing approach. Design structure matrices are dramatically simplified by avoiding unnecessary iterations while sizing, validating, and testing hardware and software resources.
by Eumir P. Reyes.
S.M.in System Design and Management
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Hong, SungBum. "Solutions for Dynamic Channel Assignment and Synchronization Problem for Distributed Wireless Multimedia System." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3249/.
Повний текст джерелаАнотація:
The recent advances in mobile computing and distributed multimedia systems allow mobile hosts (clients) to access wireless multimedia Data at anywhere and at anytime. In accessing multimedia information on the distributed multimedia servers from wireless personal communication service systems, a channel assignment problem and synchronization problems should be solved efficiently. Recent demand for mobile telephone service have been growing rapidly while the electro-magnetic spectrum of frequencies allocated for this purpose remain limited. Any solution to the channel assignment problem is subject to this limitation, as well as the interference constraint between adjacent channels in the spectrum. Channel allocation schemes provide a flexible and efficient access to bandwidth in wireless and mobile communication systems. In this dissertation, both an efficient distributed algorithm for dynamic channel allocation based upon mutual exclusion model, and an efficient distributed synchronization algorithm using Quasi-sink for wireless and mobile multimedia systems to ensure and facilitate mobile client access to multimedia objects are proposed. Algorithm's performance with several channel systems using different types of call arrival patterns is determined analytically. A set of simulation experiments to evaluate the performance of our scheme using message complexity and buffer usage at each frame arrival time.
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Poppi, Stefano. "Solar heat pump systems for heating applications : Analysis of system performance and possible solutions for improving system performance." Doctoral thesis, KTH, Energiteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-214552.
Повний текст джерелаАнотація:
Solar heat pump systems (SHPs) are systems that combine solar energy and heat pumps. SHPs have been investigated for several decades and have been proven to increase the share of renewable energy and reduce electric energy demand in residential heating applications. Many solar thermal heat pump systems have become market-available in recent years; however these systems are still not widely employed in the residential sector. This is due mainly to the high initial costs (investment and installation costs) of solar thermal heat pump systems, which limits their cost-effectiveness. Enhancing cost-effectiveness of solar thermal heat pump systems is necessary for a more effective and broader market penetration. In this thesis, solar thermal and photovoltaic systems combined with heat pumps for heating applications are treated. The overall aims of the thesis are to: 1) investigate techno-economics of SHPs and 2) investigate possible solutions for improving system performance of a reference solar thermal and heat pump system for residential heating applications. In the first part of the thesis, the influence of climatic boundary conditions on economic performance of SHPs has been investigated by means of: a) an economic comparison of SHPs found in the relevant literature and b) system simulations of the reference solar thermal heat pump system. In the second part of the thesis, potential solutions for improving system performance of the reference solar thermal heat pump system with limited change in system’ costs are investigated. A systematic approach was used for investigating cost-effectiveness of the system improvements in the reference system. Based on results of the cost-effectiveness analysis, some of the investigated system improvements were chosen for being included in the design of a novel solar thermal and air source heat pump system concept. The novel system was designed for a house standard with relatively high operating temperatures (55°C/45°C) in the space heating distribution system and for high space heating demand (123 kWh/m2·year). Finally, the thesis ends with a cost-effectiveness analysis of the novel system.QC 20170918
MacSheep
iNSPiRe
11
Rodriguez-Contreras, Pérez Pablo. "GNSS liability issues : possible solutions to a global system." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=78228.
Повний текст джерелаАнотація:
Navigation by satellite---GNSS---is a local technology with global repercussions. Although operation and control rest in government hands, the consequences of satellite use, most often beneficial, have a worldwide effect. Controversy arises when this free-of-direct-charge technology, on which the International Community relies, fails, thus causing damage to third parties.It was the intention of the drafters and negotiators of the international space law regime to establish a victim-oriented liability framework, in order to guarantee adequate compensation for damage caused by space activities. Unfortunately, it seems that the present regime has only partially met these goals.
The surest means of obtaining compensation is through domestic legal regimes, but these regimes are naturally subject to the ebb and flow of government policy and judicial discretion.
The present thesis will analyse the established liability regimes for which a damaged GNSS final user may seek compensation, and will finally consider whether the drafting of a GNSS Convention is opportune.
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Tegarden, David. "Cosmological solutions of the Einstein-Vlasov-scalar field system." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975301276.
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Li, Sinan, and 李思南. "Several reliability issues and solutions for LED lighting system." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/197552.
Повний текст джерелаАнотація:
This thesis presents a study on several reliability issues for LED lighting systems. Firstly, a full survey on exsiting LED ballast has been conducted, and critical design challenges are classified on power level basis (low/ middle/ high power). Specifically, reliability issues have been highlighted, and three major factors have been stipulated: issue of electrolytic capacitor; issue of current imbalance in parallel LED strings; issue of LED junction temperature. The information revealed in the whole survey provide important design criteria for existing LED system designs and guidance for further research directions by pointing out the critical design problems.
Two possible solutions for Electrolytic-Capacitor-Less LED Ballasts are proposed regarding the first reliability issue. A series of novel passive LED ballasts are proposed. They are found to be suitable for outdoor applications, such as street lighting applications, where the ability to withstand extreme weather conditions are of major concern. When compared with those in switched mode power supplies, these passive ballasts have good power factor performance and comparatively high efficiency. In addition, an active solution has been developed for indoor applications. Its circuit topology is derived from existing differential inverter topologies and inherits same merits such as simple structure, reduced size, and low cost.
Self-configurable current-mirror techniques have been derived and developed afterwards to cope with the current imbalance issue for system with parallel LED strings. In contrast with traditional current sharing methods (either linear type or switched type), the proposed techniques offer a simple solution without the need of independent current references, complicated controllers and auxiliary power supplies. These features are favored by outdoor applications and such re-configurable mirror circuits are originally designed for passive LED ballast as post-current regulators. The techniques are further extended with the ability to tolerate possible circuit failure, such as short circuit and open circuit fault.
Then, a new non-contact method for the measurement of both junction-to-case thermal resistance and junction temperature in a LED device has been proposed, with respect to the third reliability issue. Traditionally the direct measurement of junction temperature in LED is not easy without the help of sophisticated methods such as laser or expensive equipment like TeraLED Transient Thermal Tester system. In contrast, the proposed method requires only the external LED power, luminous flux, and heatsink temperature information. The method can be further adopted as a simple tool by engineers to check the internal temperature states in a practical LED system for regulation and evaluation purpose.
Finally, a thermal design methodology has been developedfor an LED street lamp system powered by a weakly regulated renewable small power grid. It has been successfully incorporated in the proposed passive LED ballast, such that the LED system can provide the least output luminous fluctuation against line voltage variation. It is envisaged that, with the proposed design methodology, such lighting system will not only provide high reliability, with potential lifetime exceeding 10 years, but with a proven feature of reduced light fluctuation, furthermore, it is found that the passive LED system can act as a smart load and has the potential of reducing the energy storage requirement for smart grids. These merits are attractive to public lighting systems powered by future renewable power grids.published_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy
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Mixon, Melody D. "Approximate solutions to the anti-symmetric quadratic spring system." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 1992. http://digitalcommons.auctr.edu/dissertations/3525.
Повний текст джерелаАнотація:
We investigate the construction of analytic approximations to the solutions of the nonlinear anti-symmetric quadratic oscillator. The procedure used is based on the method of generalized harmonic balance as formulated by Mickens. We prove that all solutions to the differential equation are bounded and periodic. This result is based upon the use of a correct definition of the absolute value of a variable and the use of this definition to calculate its derivative.
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Kou, Xin. "Rogue Wave Solutions to Integrable System by Darboux Transformation." ScholarWorks @ UVM, 2014. http://scholarworks.uvm.edu/graddis/306.
Повний текст джерелаАнотація:
The Darboux transformation is one of the main techniques for finding solutions of integrable equations. The Darboux transformation is not only powerful in the construction of muilti-soliton solutions, recently, it is found that the Darboux transformation, after some modification, is also effective in generating the rogue wave solutions. In this thesis, we derive the rogue wave solutions for the Davey-Stewartson-II (DS-II) equation in terms of Darboux transformation. By taking the spectral function as the product of plane wave and rational function, we get the fundamental rogue wave solution and multi-rogue wave solutions via the normal Darboux transformation. Last but not least, we construct a generalized Darboux transformation for DS-II equation by using the limit process. As applications, we use the generalized Darboux transformation to derive the second-order rogue waves. In addition, an alternative way is applied to derive the N-fold Darboux transformation for the nonlinear Schrödinger (NLS) equation. One advantage of this method is that the proof for N-fold Darboux transformation is very straightforward.
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SCHAMBERG, ANNA. "SEXUAL ASSAULT: PROBLEMS AND SOLUTIONS WITHIN THE LEGAL SYSTEM." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/613572.
Повний текст джерелаАнотація:
Sexual assault is prevalent and persistent throughout the United States. Despite how often sexual assaults occur, it remains difficult to prosecute attackers. It is well documented that current sexual assault laws vary throughout the United States. By examining sexual assault statistics and sexual assault laws, this thesis seeks to show how current laws on rape and sexual assault hamper prosecution. As national discourse on sexual assault arises, more organizations attempt to find solutions. The State of California has passed a bill that requires affirmative consent and the American Legal Institute is in the process of updating the Model Penal Code on sexual assault. This thesis examines the possible impact of these changes to sexual assault law. I will suggest, in addition to these changes, there needs to be federal guidelines for police departments to follow when investigating sexual assault claims and a standard, national definition of consent.
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馮達淸 and Tat-ching Fung. "Steady state solutions of nonlinear dynamic systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31231809.
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Lindy, Fred L. "Differential solutions using long-range, dual-frequency GPS correction data." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FLindy.pdf.
Повний текст джерелаАнотація:
Thesis (M.S. in Operations Research)--Naval Postgraduate School, September 2002.Thesis advisor(s): James R. Clynch, James N. Eagle, Samuel E. Buttrey. Includes bibliographical references (p. 77-79). Also available online.
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Duo, Xinzhong. "System-on-package solutions for multi-band RF front end." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-482.
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Le, Thi Chung [Verfasser]. "Improving spectral efficiency using hybrid system solutions / Chung Le Thi." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2019. http://d-nb.info/1188406493/34.
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Zypchen, Andrea Carleton University Dissertation Mathematics and statistics. "Series solutions of the Lorenz system and the Duffing equation." Ottawa, 1994.
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Švanda, Jan. "Řešení správy dokumentů ve firmě E-solutions, s.r.o." Master's thesis, Vysoká škola ekonomická v Praze, 2008. http://www.nusl.cz/ntk/nusl-5265.
Повний текст джерелаАнотація:
Presented thesis is focused to the document management system in the firm E-solutions, Ld. Selection of this firm is purposeful, because I have been working in the firm for several years. My thesis is targeted to the complex analysis of document management system (DMS) in the firm and the results of the analysis will be used for the implementation of new DMS. The target is accomplished by following steps, which can be expressed as partial concrete goals: First, the present situation of DMS in the firm is described, next, the detail description of the documents, the system should work with, is presented. Description of these documents is structured to the DMS needs. Subsequently firm processes which should DMS support are identified and analysed. These processes are converted to the optimal conditions to maximize their effectiveness in the DMS support. Integral part of the analysis is the consistent collection of the requirements to the new system. The thesis is divided into theoretical and practical part. The theoretical part describes DMS generally, explains basic principles of DMS (characteristics, documentation and functionality) and creates base line for the practical part. The more comprehensive practical part of the thesis is directed to the document management in the firm E-solutions, Ld. Presentation of the basic information about the firm is followed by detail solution of partial goals. Assessment of the achieved results creates the final part of the work. The thesis will serve in the firm or at a contactor of DMS as the base for the selection, parameterisation and implementation of the concrete DMS solution.
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Petersson, Magnus. "Microstrip Solutions for Innovative Microwave Feed Systems." Thesis, Linköping University, Department of Science and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1034.
Повний текст джерелаАнотація:
This report is introduced with a presentation of fundamental electromagnetic theories, which have helped a lot in the achievement of methods for calculation and design of microstrip transmission lines and circulators. The used software for the work is also based on these theories.
General considerations when designing microstrip solutions, such as different types of transmission lines and circulators, are then presented. Especially the design steps for microstrip lines, which have been used in this project, are described. Discontinuities, like bends of microstrip lines, are treated and simulated. There are also sections about power handling capability of microstrip transmission lines and different substrate materials.
In the result part there are computed and simulated dimensions of the microstrip transmission lines used in the prototype system. Simulations of conceivable loads in the cavity illustrate quantitatively the reflection coefficient. Even practical measurements are made in a network analyzer and are presentedin this part.
Suitable materials and dimensions for the final microwave feed transmission line system for high powers are then presented. Since circulators are included in the system a basic introduction to the design of these in stripline and microstrip techniques is also made.
At last conclusions, examinations of the designed system and comparisons to the today’s systems are made.
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Sætrang, Sondre. "RSW Systems with CO2 as Refrigerant : Testing of new system solutions for sea water coolers." Thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11034.
Повний текст джерелаАнотація:
In a refrigerated seawater (RSW) system using carbon dioxide (CO2) as the refrigerant, a variable bypass valve was installed in front of a suction gas heat exchanger (SGHX). A simulation tool was developed and utilized to optimize the systems transcritical performance (COP) with respect to the gas cooler pressure and choke valve inlet temperature for cooling and combined cooling and water heating. The simulations indicate that the RSW system performance can be increased compared to running a system with a traditional non-variable suction gas heat exchanger, but only when the cooling water temperatures are high (above ~25°C) or where air is used as the cooling medium, for instance commercial or mobile refrigeration. It is strongly recommended that a system to be used for simultaneous cooling and heating should have an improved design compared to the current setup, as this mode of operation shows low cooling capacity and poor energy efficiency.
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Pazos, Escudero Nuria. "Performance estimation for the design space exploration of system-on-chip solutions." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969626657.
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Mottola, Danica J. "Solutions for total force structure division's conduct of troop-to-task analysis." Thesis, Monterey, California : Naval Postgraduate School, 2010. http://edocs.nps.edu/npspubs/scholarly/theses/2010/Mar/10Mar%5FMottola.pdf.
Повний текст джерелаАнотація:
Thesis (M.S. in Manpower Systems Analysis)--Naval Postgraduate School, March 2010.Thesis Advisor(s): Simon, C. A. ; Hatch, W. D. Second Reader:Dooley, S. G. "March 2010." Description based on title screen as viewed on April 23, 2010. Author(s) subject terms: Troop-to-task analysis, Deputy Commandant Combat Development and Integration (DC, CD&I), Total Force Structure Division (TFSD), Total Force Structure Process (TFSP), Expeditionary Force Development System (EFDS), Marine Requirements Oversight Council (MROC), Universal Needs Statement (UNS), Uncompensated Review Board (URB), Capabilities Based Analysis (CBA) Includes bibliographical references (p. 99-101). Also available in print.
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Karakaya, İshak. "Electrochemical determination of thermodynamic properties of magnesium cell electrolyte : the system MgCl2-NaCl-Cacl2." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=72023.
Повний текст джерелаАнотація:
This investigation involved the experimental study of molten salt solutions containing magnesium chloride, sodium chloride and calcium chloride--an electrolyte of importance in magnesium production. Emf measurements were made on an electrochemical formation cell with pure chlorine gas and magnesium-bismuth alloy electrodes. Good agreement was obtained with the existing data on the thermodynamic properties of pure MgCl(,2) and MgCl(,2) - NaCl binary melts. Nearly ideal (Raoultian) solution behaviour was observed in the binary MgCl(,2) - CaCl(,2) melts. Although the thermodynamic data in this system was different than the reported vapour pressure data it was found to be in accord with the reported phase diagram measurements. The properties of MgCl(,2) in the ternary melts were measured for the first time.A multiple discrete complex anion (MDCA) model was proposed to correlate all thermodynamic findings in MgCl(,2) - NaCl - CaCl(,2) molten salt solutions. Successful interrelations were obtained when both MgCl(,4)('=) and CaCl(,4)('=) were assumed to coexist in a state of equilibrium with the elementary ions Cl('-), Na('+), Mg('2+) and Ca('2+).
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Ebrahimpour, Mohammad Reza. "An analytical study of the power flow equations with applications to systems with multiple close solutions." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/15746.
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Amaris, Mesa Alejandro Dario. "Developments of Advanced Solutions for Seismic Resisting Precast Concrete Frames." Thesis, University of Canterbury. Department of Civil and Natural resources, 2010. http://hdl.handle.net/10092/4979.
Повний текст джерелаАнотація:
Major advances have been observed during the last two decades in the field of seismic engineering with further refinements of performance-based seismic design philosophies and the subsequent definition of corresponding compliance criteria. Following the globally recognized expectation and ideal aim to provide a modern society with high (seismic) performance structures able to sustain a design level earthquake with limited or negligible damage, alternative solutions have been developed for high-performance, seismic resisting systems.
In the last two decades, an alternative approach in seismic design has been introduced for precast concrete buildings in seismic regions with the introduction of “dry” jointed ductile systems also called “hybrid” systems based on unbonded post-tensioned rocking connections. As a result structural systems with high seismic performance capabilities can be implemented, with the unique capability to undergo inelastic displacement similar to their traditional monolithic counterparts, while limiting the damage to the structural system and assuring full re-centring capabilities (negligible residual or permanent deformations).
The continuous and rapid development of jointed ductile connections for seismic resisting systems has resulted in the validation of a wide range of alternative arrangements, encompassed under the general umbrella of “hybrid” systems.
This research provides a comprehensive experimental and analytical investigations of 2- and 3-Dimensional, 2/3 scaled, exterior beam-column joints subjected both uni and bi-directional (four clove) quasic-static loading protocols into the behaviour, modelling, design and feasibility of new arrangements for “dry” jointed ductile systems for use in regions of high seismicity. In order to further emphasize the enhanced performance of these systems, a comparison with the experimental response and observed damage of 2-D and 3-D monolithic beam-column benchmark specimens is presented.
However, after a lot of attention given to the behaviour of the skeleton structure, more recently the focus of research in Earthquake Engineering has concentrated on the behaviour of the floor system within the overall 3D behaviour of the building and the effects of beam elongation. The effects of beam elongation in precast frame systems have been demonstrated to be a potential source of un-expected damage, unless adequate detailing is provided in order to account for displacement incompatibilities between the lateral resisting systems and the floor. Two contributions to beam elongation are typically recognized: a) the material contribution due to the cumulative residual strain within the steel, and b) the geometrical contribution due to the presence of a neutral axis and actual depth of the beam.
Regarding jointed ductile connections with re-centering characteristics, the extent of beam elongation is significantly reduced, being limited to solely the geometrical contribution. Furthermore, such effects could be minimized when a reduced depth of the beam is adopted due to the use of internal prestressing or external post-tensioning. However, damage to precast floor systems, resulting from a geometric elongation of the beam, has yet to be addressed in detail.
In order to emphasize the enhanced performance in controlling and minimizing the damage of the structural elements via the use of the proposed advanced hybrid solutions, this research presents via experimental and analytical validation of two alternative and innovative solutions to reduce the damage to the floor using 2 and 3-Dimensional, 2/3 scaled, exterior beam-column joints.
The first approach consists of using standard precast rocking/dissipative frame connections (herein referred to as “gapping”) in combination with an articulated or “jointed” floor. This system uses mechanical devices to connect the floor and the lateral beams which can accommodate the displacement incompatibilities in the connection. The second approach to reduce the floor damage investigates the implementation of a “non-gapping” connection, also called non-tearing-floor connection, using a top hinge at the beam-column interface, while still relying on more traditional floor-to-frame connections (i.e. topping and continuous starter bars). Additionally, further refinements and constructability issues for the non gapping connection are investigated under the experimental and analytical validation of a major 2-Dimensional, 2/3 scaled, two-story one-bay frame using non-tearing floor connections.
Based on the non-tearing floor connections, a series of parametric analysis for beam-column joints and frames are carried out. Furthermore, the analysis and design of two prototype frames using different solutions is presented. The frames are subjected to cyclic adaptive pushover and inelastic time history analysis in order to investigate analytically the response characteristics of hybrid frames using non-tearing connections, as well as how the beam growth affects the frame response under earthquake loading. Computational models for hybrid PRESSS frames and a conventional reinforced concrete frames are developed and compared with the ones using non-tearing connections.
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Patil, Samir 1971. "Mapping the product development process to IT solutions through use models." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/88327.
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Parramon, Piella Jordi. "Energy Management, wireless and system solutions for highly integrated implantable devices." Doctoral thesis, Universitat Autònoma de Barcelona, 2002. http://hdl.handle.net/10803/5337.
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Lilliesköld, Joakim. "Global project management : developing system solutions in a multi-organizational environment." Licentiate thesis, KTH, Electrical Systems, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1487.
Повний текст джерелаАнотація:
The traditional view of project management is beingchallenged by the globalization of markets, mergers ofinternational companies, and the integration of managerial andbusi-ness processes in global corporations. The development ofInformation Technology and the rapid growth of the Internet hascreated an opportunity to utilize global resources, resultingin new and unique problems within project management researchthat need to be addressed.
This thesis focuses on problems in project managementexperienced by global system suppliers trying to adapt theirbusinesses to the rapid changes of customers needs. Itespe-cially focuses on geographically dispersed organizationsconsisting of several organizations in different countries,with disparate history and corporate culture, developing anddeliver-ing complex systems under the company's name.
In order to identify potential problems faced by globalmulti-organizational companies, especially system supplierswith large research and development (R&D) budgets, aframe-work is suggested. This framework divides the problemsinto three categories: geographi-cal, organizational andcultural. The problems identified in the case studies are thenclassi-fied to these categories. Finally, a description of howthe identified problems can be man-aged is provided when themost important success factors identified in the studies arepresented.
QC 20100512
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Xu, Qiang Nicolici Nicola. "Solutions for emerging problems in modular system-on-a-chip testing." *McMaster only, 2005.
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Sheu, Shin-pyng. "Bäcklund transformation and homoclinic solutions to the coupled nonlinear Schrödinger system /." Connect to resource, 1992. http://rave.ohiolink.edu/etdc/view.cgi?acc%5Fnum=osu1261505344.
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Jones, Gareth. "End to end solutions for a droplet microfluidic autonomous experimentation system." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/345852/.
Повний текст джерелаАнотація:
Scientific discovery is limited by finite experimental resources. Therefore, careful strategic planning is required when committing resources to an experiment. Often the decision to commit resources is based upon observations made from previous experiments. However real-world data is inherently noisy and often follows an underlying nonlinear trend. In such circumstances the decision to commit resources is unclear. Autonomous experimentation, where machine learning algorithms control an experimentation platform, is one approach that has the potential to deal with these issues and consequently could help drive scientific discoveries. In the context of applying autonomous experimentation to identify new behaviours from chemical or biological systems, the machine learning algorithms are limited by the capability of the hardware technology to generate on demand, complex mixtures from a wide range of chemicals. This limitation forms the basis for the work described in this thesis. Specifically this thesis documents the development of a hardware system which is designed to support scalability, is capable of automating processes, and is built from technology readily accessible to other researchers. The hardware system is derived from droplet microfluidic technology and allows for microscale biochemical samples of varying composition to be automatically created. During the development of the hardware system, technical challenges in fabrication, sensor system development, microfluidic design and mixing were encountered. Solutions to address these challenges were found and are presented as, fabrication techniques that enable integrated valve microfluidic devices to be created in a standard chemistry laboratory environment without need for sophisticated equipment, a compact UV photometer system built using optical semiconductor components, and a novel mixing strategy that increased the mixing efficiency of large droplets. Having addressed these technical challenges and in fulfilling the aims set out above, the work in this thesis has sufficiently improved hardware technology to free the machine learning algorithms from the constraint of working with just a few experimental variables.
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Sheu, Shin-Pyng. "Bäcklund transformation and homoclinic solutions to the coupled nonlinear Schrödinger system." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1261505344.
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Sheu, Shin-pyng. "Bäcklund transformation and homoclinic solutions to the coupled nonlinear Schrödinger system /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487779120910002.
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Barwari, Bala Farhad. "Asymptotic and numerical solutions of a two-component reaction diffusion system." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/37231/.
Повний текст джерелаАнотація:
In this thesis, we study a two-component reaction diffusion system in one and two spatial dimensions, both numerically and asymptotically. The system is related to a nonlocal reaction diffusion equation which has been proposed as a model for a single species that competes with itself for a common resource. In one spatial dimension, we find that this system admits traveling wave solutions that connect the two homogeneous steady states. We also analyse the long-time behaviour of the solutions. Although there exists a lower bound on the speed of travelling wave solutions, we observe that numerical solutions in some regions of parameter space exhibit travelling waves that propagate for an asymptotically long time with speeds below this lower bound. We use asymptotic methods to both verify these numerical results and explain the dynamics of the problem, which include steady, unsteady, spike-periodic travelling and gap-periodic travelling waves. In two spatial dimensions, the numerical solutions of the axisymmetric form of the system are presented. We also establish the existence of a steady axisymmetric solution which takes a form of a circular patch. We then carry out a linear stability analysis of the system. Finally, we perform bifurcation analysis of these patch solutions via a numerical continuation technique and show how these solutions change with respect to variation of one bifurcation parameter.
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Houghton, Samuel. "Integral-Based Inverse Problem Solutions for DIET Systems." Thesis, University of Canterbury. Mechanical Engineering, 2007. http://hdl.handle.net/10092/1138.
Повний текст джерелаАнотація:
Magnetic Resonance Elastography (MRE) is an emerging method for non-invasive breast cancer screening. It takes the MRI displacement data output and reconstructs the internal stiffness distribution, where cancerous tissue is approximately five to ten times stiffer than healthy breast tissue. Hence, MRE offers a high contrast solution to this diagnostic problem. Current MRE methods for reconstructing stiffness use forward simulation based optimization methods that are highly non-linear, non-convex and very heavy computationally. This research develops integral-based inverse problem solutions that reformulate the underlying differential equations in terms of integrals of MRI measured displacement data, and this transforms the problem into a linear, convex optimization. All derivative terms in the formulation are removed by special choice of integration limits, so no smoothing or filtering of the input data is required. The resulting equations can easily be solved by linear least squares requiring very minimal computation. 1D inverse algorithms were developed to provide a proof of concept of the integral-based method. Initially, the complete compressible 2D Navier's equations were used to develop the 2D inverse methods. Reasonable results were achieved with the algorithm successfully identifying a 1cm by 1cm tumour with up to 10% noise, data resolution of 20 measured points per cm and actuation frequencies of 100Hz. However, for the same input data set, a simplified incompressible 2D model was used as the basis for the final proposed inverse algorithm. This approach significantly improved results by removing ill-conditioned terms from the original formulation. For a 1cm by 1 cm tumour, accurate results were obtained with up to 40% noise, a range of actuation frequencies and very low data resolution of the order of 2 measured points per cm. These results thus indicate that more crude and less expensive data measurement systems could be used to obtain good results. The methods developed can be readily extended to 3D by applying a similar incompressible integral formulation to the 3D Navier's equations.
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Engler, Candice (Candice Lynn). "Analysis of enterprise architecture alignment : delivering system of systems solutions in response to shifting customer expectations." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/79511.
Повний текст джерелаАнотація:
Thesis (S.M.)--Massachusetts Institute of Technology, Engineering Systems Division, 2012.Cataloged from PDF version of thesis. Page 98 blank.
Includes bibliographical references (p. 95-97).
There is urgency for NewCo, a large multinational corporation, to better execute programs spanning across product lines. This is because the number of these programs appears to be increasing and there are indicators that this trend will continue moving forward. The increase is driven by both business and customer needs for commonality as well as a shift in customer expectations making NewCo's current product lines a subsystem in a large system of systems. NewCo has recently struggled to execute programs implementing technology spanning product lines successfully. The organization is rooted in decentralized engineering of individual product lines and gaining alignment across these internal stakeholders is very difficult. The goal of this research is to identify factors making programs that span across multiple product lines and corporate divisions more difficult than expected making achieving commonality difficult. The research will also recommend potential changes to the design of the overall enterprise to improve the ability to execute programs spanning multiple product lines successfully. Using an exploratory research approach, the current state of NewCo has been evaluated based on value exchange with stakeholders and an eight views enterprise architecting framework. Nine individual factors that contribute towards the difficulty in these programs that consolidate into five categories are identified. The first category ties to strategy and includes three topics: the lack of enterprise alignment, the impact of decentralized history and culture, and the strategic choice in addressing system of systems transition. The second category relates to the organization structure and has three veins within it as well: the status of most recent organizational realignment, the perceptions around supporting businesses and shared services, and the increase in councils and committees. The third category discusses enterprise policies focusing on the metrics used to measure the divisions. The fourth category reviews the decision making process and the culture of consensus. The fifth and final category relates to knowledge sharing and recent process improvements and shifting roles that impact the ability to effectively share knowledge. Six initial recommendations are presented based upon the findings of this research. First, intentionally "design" the system of systems solution including centralizing a portion of engineering to allocate requirements to product lines and shared services. Second, reinvigorate reorganization effort of Division B and expand shared services. Third, revise policies to incent cooperation and supporting system of systems solutions. Fourth, establish clear roles and empower decision makers. Fifth, continue to invest in process improvements within the marketing organization and the knowledge transfer into product development. The sixth and final recommendation includes reiterating that programs spanning product lines are difficult. This would create awareness that commonality and system of systems solutions are not easy to develop. If team members and leadership begin these programs acknowledging the challenges ahead of them they will be better able to position the program for success. The next step is to validate these recommendations with senior leaders within NewCo. Additional research could continue though the Enterprise Strategic Analysis and Transformation (ESAT) framework and complete steps five through eight for NewCo. A second future research opportunity would be to conduct a larger study incorporating different enterprises within different industries that are facing the same challenge of shifting from individual product lines to delivering customers complete integrated solutions that span traditional product boundaries. This type of research could potentially identify best practices and provide insights for the most effective enterprise architecture.
by Candice Engler.
S.M.
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Cheng, Danling. "Integrated System Model Reliability Evaluation and Prediction for Electrical Power Systems: Graph Trace Analysis Based Solutions." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/28944.
Повний текст джерелаАнотація:
A new approach to the evaluation of the reliability of electrical systems is presented. In this approach a Graph Trace Analysis based approach is applied to integrated system models and reliability analysis. The analysis zones are extended from the traditional power system functional zones. The systems are modeled using containers with iterators, where the iterators manage graph edges and are used to process through the topology of the graph. The analysis provides a means of computationally handling dependent outages and cascading failures. The effects of adverse weather, time-varying loads, equipment age, installation environment, operation conditions are considered. Sequential Monte Carlo simulation is used to evaluate the reliability changes for different system configurations, including distributed generation and transmission lines. Historical weather records and loading are used to update the component failure rates on-the-fly. Simulation results are compared against historical reliability field measurements.
Given a large and complex plant to operate, a real-time understanding of the networks and their situational reliability is important to operational decision support. This dissertation also introduces using an Integrated System Model in helping operators to minimize real-time problems. A real-time simulation architecture is described, which predicts where problems may occur, how serious they may be, and what is the possible root cause.Ph. D.
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Zhu, Ruiying. "An eigenmatrices method to obtain transient solutions for the M/M/k:(N/FIFO) queueing system (k=1,2)." Ohio : Ohio University, 1991. http://www.ohiolink.edu/etd/view.cgi?ohiou1183989760.
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Bakhtyar, Shoaib. "Designing Electronic Waybill Solutions for Road Freight Transport." Doctoral thesis, Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-11775.
Повний текст джерелаАнотація:
In freight transportation, a waybill is an important document that contains essential information about a consignment. The focus of this thesis is on a multi-purpose electronic waybill (e-Waybill) service, which can provide the functions of a paper waybill, and which is capable of storing, at least, the information present in a paper waybill. In addition, the service can be used to support other existing Intelligent Transportation System (ITS) services by utilizing on synergies with the existing services. Additionally, information entities from the e-Waybill service are investigated for the purpose of knowledge-building concerning freight flows. A systematic review on state-of-the-art of the e-Waybill service reveals several limitations, such as limited focus on supporting ITS services. Five different conceptual e-Waybill solutions (that can be seen as abstract system designs for implementing the e-Waybill service) are proposed. The solutions are investigated for functional and technical requirements (non-functional requirements), which can potentially impose constraints on a potential system for implementing the e-Waybill service. Further, the service is investigated for information and functional synergies with other ITS services. For information synergy analysis, the required input information entities for different ITS services are identified; and if at least one information entity can be provided by an e-Waybill at the right location we regard it to be a synergy. Additionally, a service design method has been proposed for supporting the process of designing new ITS services, which primarily utilizes on functional synergies between the e-Waybill and different existing ITS services. The suggested method is applied for designing a new ITS service, i.e., the Liability Intelligent Transport System (LITS) service. The purpose of the LITS service isto support the process of identifying when and where a consignment has been damaged and who was responsible when the damage occurred. Furthermore, information entities from e-Waybills are utilized for building improved knowledge concerning freight flows. A freight and route estimation method has been proposed for building improved knowledge, e.g., in national road administrations, on the movement of trucks and freight. The results from this thesis can be used to support the choice of practical e-Waybill service implementation, which has the possibility to provide high synergy with ITS services. This may lead to a higher utilization of ITS services and more sustainable transport, e.g., in terms of reduced congestion and emissions. Furthermore, the implemented e-Waybill service can be an enabler for collecting consignment and traffic data and converting the data into useful traffic information. In particular, the service can lead to increasing amounts of digitally stored data about consignments, which can lead to improved knowledge on the movement of freight and trucks. The knowledge may be helpful when making decisions concerning road taxes, fees, and infrastructure investments.
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Rodriguez, Edwin Gonzalo Murcia. "Positive solutions for Schrödinger-Poisson type systems." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/45/45131/tde-17122017-094108/.
Повний текст джерелаАнотація:
In this thesis we study Schrödinger-Poisson systems and we look for positive solutions. Our work consists in three chapters. Chapter 1 includes some basic facts on critical point theory. In Chapter 2 we consider a fractional Schrödinger-Poisson system in the whole space R^N in presence of a positive potential and depending on a small positive parameter . We show that, for suitably small (i.e. in the \"semiclassical limit\") the number of positive solutions is estimated below by the Ljusternick-Schnirelmann category of the set of minima of the potential. Finally, in Chapter 3, we analyze a Schrödinger-Poisson system in R^3 under an asymptotically cubic nonlinearity. We prove the existence of positive, radial solutions inside a ball and in an exterior domain.Nesta tese nós estudamos sistemas de Schrödinger-Poisson e procuramos soluções positivas. Nosso trabalho consiste em três capítulos. O Capítulo 1 contém alguns fatos básicos sobre a teoria de pontos críticos. No Capítulo 2 nós consideramos um sistema fracionário de Schrödinger-Poisson em todo o espaço R^N em presença de um potencial positivo e que depende de um pequeno parâmetro positivo . Nós mostramos que, para suficentemente pequeno (i.e. no limite semiclássico) o número de soluções positivas é estimado por abaixo pela categoria de Ljusternick-Schnirelmann dos conjuntos onde o potencial é mínimo. Finalmente, no Capítulo 3 nós analisamos um sistema Schrödinger-Poisson em R^3 sob a não linearidade assintoticamente cúbica. Mostramos a existência de soluções radiais positivas dentro de uma bola e em um domínio exterior.
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Acevedo, Tapia Paul Andres. "Theorie L^p pour le système de boussinesq." Thesis, Pau, 2015. http://www.theses.fr/2015PAUU3027/document.
Повний текст джерелаАнотація:
Cette thèse est consacrée à l’étude du système de Boussinesq stationnaire:-νΔu+(u⋅∇)u+∇π=θg, div u=0,dans Ω(1a)-κΔθ+u⋅∇θ=h,dans Ω (1b)où Ω⊂R^3 est un ouvert, borné et connexe; les inconnues du système sont u,π et θ: la vitesse, la pression et la température du fluide, respectivement; ν>0 est la viscosité cinématique du fluide, κ>0 est la diffusivité thermique du fluide, g est l’accélération de la pesanteur et h est une source de chaleur appliquée au fluide.L’objectif de cette thèse est l’étude de la théorie L^p pour le système de Boussinesq en considérant deux différents types de conditions aux limites du champ de vitesse. En effet, dans une première partie, nous considérons une condition de Dirichlet non homogèneu=u_b, sur Γ (2)où Γ désigne la frontière du domaine. Dans une deuxième partie, nous considérons une condition de Navier non homogèneu⋅n=0,2[D(u)n]_τ+αu_τ=a,sur Γ(3)où D(u)=1/2 (∇u+(∇u)^T ) est le tenseur de déformation associé au champ de vitesse u, n est le vecteur normal unitaire extérieur, τ est le correspondant vecteur tangent unitaire, α et a sont une fonction scalaire de friction et un champ de vecteur tangentiel donnés sur la frontière, respectivement. De plus, la condition aux limites pour la température sera, dans les deux premières parties, une condition aux limites de Dirichlet non homogèneθ=θ_b, sur Γ. (4)Alors, premièrement, nous étudions l’existence et l’unicité d’une solution faible pour le problème (1), (2) et (4) dans le cas hilbertien. Également, l’existence de solutions généralisées pour p≥3/2 et des solutions fortes pour 12 et des solutions fortes pour p≥6/5 pour le problème (1), (3) et (4). Notez que l’hypothèse d’une frontière non-connexe, mentionnée précédemment, ne figurait pas dans cette partie du travail en raison de la restriction d’imperméabilité de la frontière.Enfin, dans la dernière partie de cette thèse, nous étudions la théorie L^p pour les équations de Stokes avec la condition de Navier (3). Plus précisément, nous examinons la régularité W^(1,p) pour p≥2 et la régularité W^(2,p) pour p≥6/5.Mots clés: système de Boussinesq; régularité L^p; solutions faibles; solutions fortes; solutions très faiblesThis thesis is dedicated to the study of the stationary Boussinesq system:-νΔu+(u⋅∇)u+∇π=θg, div u=0,in Ω(1a)-κΔθ+u⋅∇θ=h,in Ω (1b)where Ω⊂R^3 is an open bounded connected set; u,π and θ are the velocity field, pressure and temperature of the fluid, respectively, and stand for the unknowns of the system; ν>0 is the kinematic viscosity of the fluid, κ>0 is the thermal diffusivity of the fluid, g is the gravitational acceleration and h is a heat source applied to the fluid.The aim of this thesis is the study of the L^p-theory for the stationary Boussinesq system in the context of two different types of boundary conditions for the velocity field. Indeed, in the first part of the thesis, we will consider a non-homogeneous Dirichlet boundary conditionu=u_b, on Γ (2)where Γ denotes the boundary of the domain; meanwhile in the second part, the velocity field will be prescribed through a non-homogeneous Navier boundary conditionu⋅n=0,2[D(u)n]_τ+αu_τ=a,on Γ(3)where D(u)=1/2 (∇u+(∇u)^T ) is the strain tensor associated with the velocity field u, n is the unit outward normal vector, τ is the corresponding unit tangent vector, α and a are a friction scalar function and a tangential vector field defined both on the boundary, respectively. Further, the boundary condition for the temperature will be, in the first two parts of the thesis, a non-homogeneous Dirichlet boundary conditionθ=θ_b, on Γ. (4)Then, firstly, we study the existence and uniqueness of the weak solution for the problem (1), (2) and (4) in the hilbertian case. Also, the existence of generalized solutions for p≥3/2 and strong solutions for 12 and strong solutions for p≥6/5 for the problem (1), (3) and (4). Note that the assumption of a non-connected boundary, which was mentioned before, will not appear here due to the impermeability restriction on the boundary.Finally, in the last part of this thesis, we study the L^p-theory for the Stokes equations with Navier boundary condition (3). Specifically, we deal with the W^(1,p)-regularity for p≥2 and the W^(2,p)-regularity for p≥6/5.Keywords: Boussinesq system; L^p-regularity; weak solutions; strong solutions; very weak solutions
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Chahine, Chakib. "Stabilité et bifurcation des solutions périodiques d'unsystème hamiltonien en dimension deux." Pau, 1987. http://www.theses.fr/1987PAUU3013.
Повний текст джерелаАнотація:
Le but essentiel du travail présenté est l'étude numérique d'un système hamiltonien conservatif non intégrale en dimension deux d'espace. Les solutions périodiques fondamentales issues de la position d'équilibre par bifurcation sont analysées, et leur stabilité orbitale etudiée. Pour chaque solution périodique fondamentale, on a pu mettre en évidence une séquence de bifurcations successives quand le paramètre énergie est varié. On a pu, enfin, mettre en évidence une transition vers un comportement chaotique lorsque le paramètre énergie augmente. Un seuil de stochasticité a pu être évalué.
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Chen, Hua, and Shaohua Wu. "On existence of solutions for some hyperbolic-parabolic type chemotaxis systems." Universität Potsdam, 2006. http://opus.kobv.de/ubp/volltexte/2009/3008/.
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Beard, Glenn Charles. "The effect of carbonated solutions on gastric emptying during prolonged cycling." Virtual Press, 1990. http://liblink.bsu.edu/uhtbin/catkey/722239.
Повний текст джерелаАнотація:
The purpose of this investigation was to determine the effect of solute carbonation and carbohydrate (CHO) concentration on gastric emptying during prolonged cycling. Eight highly trained male cyclists completed four two hour cycling bouts during which one of four test solutions were consumed. The test solutions consisted of a carbonated 10 % CHO solution (CK), a non-carbonated 10 % CHO solution (NCK), a carbonated non-CHO solution (CNK), and a noncarbonated non-CHO solution (NCNK). Approximately 150 ml (8.5 ml/kg/hr) of one of the test solutions were consumed every fifteen minutes. The first 105 minutes of each trial was a continuous ride on an electrically braked cycle ergometer at 70 % V02 max. The last fifteen minutes of each trial was a self paced "performance ride" on an isokinetic cycle ergometer. The subjects were instructed to complete as much work (kilojuoles) as possible during the performance ride. Gastric contents were aspirated within five minutes following the performance ride and analyzed to determine the amount of the original test solution emptied.Of the original1273 ml ingested during each trial, the volumes emptied were 993.6 ±78.1, 1064.6 ±75.3, 1097.4 ±94.2, and 1147.2 ±95.9 ml (±SE) for CK, NCK, CNK, NCNK, respectively. The only significant difference was between trials CK and NCNK (P < 0.05). There were no statistically significant differences in total work output between any of the trials. However, when the performance data from the CHO trials were pooled and compared to the combined data from the non-CHO trials, total work output was significantly greater (P < 0.05) in the CHO group (1185.19 + 21.81, and 1092.85 + 21.52 Kj (+ SE) for the CHO and non-CHO groups, respectively). These data suggest that carbonated or 10 % CHO solutions, independent of one another, may not significantly inhibit gastric emptying. They also suggest that there may be some interaction between carbonation and CHO concentration which caused an additional inhibition of emptying. In addition, the potential for improved performance exists with the consumption of 10 % CHO solutions.Human Performance Laboratory
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Wu, Wei. "Research on loop flow problem and its solutions in Macau power system." Thesis, University of Macau, 2003. http://umaclib3.umac.mo/record=b1807202.
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Fraser, Robert. "On the number of prime solutions to a system of quadratic equations." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44283.
Повний текст джерелаАнотація:
Consider the system of quadratic diophantine equations
bX² − aY² = 0
bX • Y − eY² = 0
constrained to the prime numbers contained in the box [0,N]²ⁿ. The Hardy-
Littlewood circle method is applied to show that, under some local conditions on a, b, and e, the number of prime solutions contained in the box is asymptotic to a constant times N²ⁿ⁻⁴/ (logN)²ⁿ , where the constant depends on a, b, and e.