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1.
Li, Bo.
Modeling and Runtime Systems for Coordinated Power-Performance Management.
Degree: PhD, Computer Science and Applications, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/87064 
► System efficiency on high-performance computing (HPC) systems is the key to achieving the goal of power budget for exascale supercomputers. Techniques for adjusting the performance…
(more)
▼ System efficiency on high-performance computing (HPC) systems is the key to achieving the goal of power budget for exascale supercomputers. Techniques for adjusting the performance of different system components can help accomplish this goal by dynamically controlling system performance according to application behaviors. In this dissertation, we focus on three techniques: adjusting CPU performance, memory performance, and the number of threads for running parallel applications. First, we profile the performance and energy consumption of different HPC applications on both Intel systems with accelerators and IBM BG/Q systems. We explore the trade-offs of performance and energy under these techniques and provide optimization insights. Furthermore, we propose a parallel performance model that can accurately capture the impact of these techniques on performance in terms of job completion time. We present an approximation approach for performance prediction. The approximation has up to 7% and 17% prediction error on Intel x86 and IBM BG/Q systems respectively under 19 HPC applications. Thereafter, we apply the performance model in a runtime system design for improving performance under a given power budget. Our runtime strategy achieves up to 20% performance improvement to the baseline method.
Advisors/Committee Members: Cameron, Kirk W. (committeechair), Butt, Ali (committee member), Lee, Dongyoon (committee member), Leon, Edgar A. (committee member), Back, Godmar Volker (committee member).
Subjects/Keywords: Parallel Performance Modeling; Dynamic Voltage and Frequency Scaling; Dynamic Memory Throttling; Dynamic Concurrency Throttling; Shared-Memory Systems
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APA (6th Edition):
Li, B. (2019). Modeling and Runtime Systems for Coordinated Power-Performance Management. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/87064
Chicago Manual of Style (16th Edition):
Li, Bo. “Modeling and Runtime Systems for Coordinated Power-Performance Management.” 2019. Doctoral Dissertation, Virginia Tech. Accessed January 17, 2021.
http://hdl.handle.net/10919/87064.
MLA Handbook (7th Edition):
Li, Bo. “Modeling and Runtime Systems for Coordinated Power-Performance Management.” 2019. Web. 17 Jan 2021.
Vancouver:
Li B. Modeling and Runtime Systems for Coordinated Power-Performance Management. [Internet] [Doctoral dissertation]. Virginia Tech; 2019. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10919/87064.
Council of Science Editors:
Li B. Modeling and Runtime Systems for Coordinated Power-Performance Management. [Doctoral Dissertation]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/87064
University of Georgia
2.
Sharma, Vijendra.
Microbial inactivation kinetics in soymilk during continuous flow high pressure throttling system.
Degree: 2014, University of Georgia
URL: http://hdl.handle.net/10724/24755
► Effect of the high pressure throttling (HPT) process on the shelf life of soymilk and determination of injured microorganisms was investigated. Soymilk was pressurized at…
(more)
▼ Effect of the high pressure throttling (HPT) process on the shelf life of soymilk and determination of injured microorganisms was investigated. Soymilk was pressurized at 207, and 276 MPa at four different exit temperatures (85, 121, 133 and
145C) and (102, 121, 133, 145C) respectively at three different flow rates (0.75, 1.0, and 1.5 L/min). Inactivation of C. sporogenes in soymilk was higher at 276 MPa as compared to that at 207 MPa when the exit temperature was 121C and hold time was 20.8
s. However, when temperature was increased to 145C more than a 5 log reduction occurred at both pressures and all the three hold times (20.8, 15.6, and 10.4 s). Pressure, time, and temperature were found to be significantly different in the inactivation
of C. sporogenes in soymilk. There were more injured cells (0.5 log) at 207 MPa than at 276 MPa. When the temperature and time was increased there were fewer injured cells implicating that spores were completely inactivated rather than injured. The D121
value of C. sporogenes by heat alone was 3 folds more in soymilk than in 0.1% peptone water.
Subjects/Keywords: high pressur throttling; microbicidal effects; soymilk; injured spores
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APA (6th Edition):
Sharma, V. (2014). Microbial inactivation kinetics in soymilk during continuous flow high pressure throttling system. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/24755
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sharma, Vijendra. “Microbial inactivation kinetics in soymilk during continuous flow high pressure throttling system.” 2014. Thesis, University of Georgia. Accessed January 17, 2021.
http://hdl.handle.net/10724/24755.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sharma, Vijendra. “Microbial inactivation kinetics in soymilk during continuous flow high pressure throttling system.” 2014. Web. 17 Jan 2021.
Vancouver:
Sharma V. Microbial inactivation kinetics in soymilk during continuous flow high pressure throttling system. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10724/24755.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sharma V. Microbial inactivation kinetics in soymilk during continuous flow high pressure throttling system. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/24755
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Iowa State University
3.
Carlson, Joshua.
A method for characterizing graphs with specified throttling numbers.
Degree: 2019, Iowa State University
URL: https://lib.dr.iastate.edu/etd/16979
► Zero forcing is a combinatorial game played on graphs in which a color change rule is used to progressively change the color of vertices from…
(more)
▼ Zero forcing is a combinatorial game played on graphs in which a color change rule is used to progressively change the color of vertices from white to blue. The (standard) color change rule is that a blue vertex u can force a white vertex w to become blue if w is the only white vertex adjacent to u. When using the color change rule, the goal is to eventually change the color of every vertex in the graph to blue. Some interesting questions arise from this process that are heavily studied. What is the smallest possible size of an initial set of blue vertices that can eventually color the entire graph blue? How much time is required to complete this process? The answer to the first question is called the zero forcing number of a graph and the answer to the second question is called the propagation time of the initial set. A more recent area of study is throttling which balances the cost of the initial set with the cost of its propagation time in order to make the process as efficient as possible. Specifically, the (standard) throttling number of a graph is the minimum value of the sum of the size of an initial set and its propagation time taken over all possible initial sets. Many variations of the color change rule also lead to variations of propagation time and throttling. These include positive semidefinite (PSD) zero forcing, the minor monotone floor of zero forcing, and the minor monotone floor of PSD zero forcing. In this dissertation, general definitions are given that allow for the study of propagation and throttling for many variants of zero forcing. In addition, a technique is introduced that is used to characterize all graphs with specified throttling numbers. This technique is then generalized and applied to obtain similar characterizations for the variants of zero forcing mentioned above.
Subjects/Keywords: minor monotone floor; positive semidefinite; propagation time; throttling; zero forcing; Mathematics
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APA (6th Edition):
Carlson, J. (2019). A method for characterizing graphs with specified throttling numbers. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/16979
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Carlson, Joshua. “A method for characterizing graphs with specified throttling numbers.” 2019. Thesis, Iowa State University. Accessed January 17, 2021.
https://lib.dr.iastate.edu/etd/16979.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Carlson, Joshua. “A method for characterizing graphs with specified throttling numbers.” 2019. Web. 17 Jan 2021.
Vancouver:
Carlson J. A method for characterizing graphs with specified throttling numbers. [Internet] [Thesis]. Iowa State University; 2019. [cited 2021 Jan 17].
Available from: https://lib.dr.iastate.edu/etd/16979.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Carlson J. A method for characterizing graphs with specified throttling numbers. [Thesis]. Iowa State University; 2019. Available from: https://lib.dr.iastate.edu/etd/16979
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Georgia
4.
Sivanandan, Litha.
Characterization of soymilk produced by continuous flow high pressure throttling process.
Degree: 2014, University of Georgia
URL: http://hdl.handle.net/10724/24494
► Standard soymilk processing uses filtration or centrifugation step to remove coarse solids in the comminuted soy. The objectives were to produce soymilk from dehulled beans…
(more)
▼ Standard soymilk processing uses filtration or centrifugation step to remove coarse solids in the comminuted soy. The objectives were to produce soymilk from dehulled beans by Gaulin homogenizer or produce sterile soymilk using
microfluidizer-throttling or continuous flow high pressure throttling (CFHPT) to retain retaining all essential soybean solids. The soymilk was characterized for particle size distribution, rheological and ultra-structural properties, to establish an
empirical model to characterize the distribution of particle size of particles in the soymilk, and to evaluate the consumer acceptability. Whole dehulled soybeans were blanched, mixed with deionized water, and comminuted coarsely in a food-processor. An
intermediate comminution step in Megatron (process M) or Fitzmill (process F) or Stonemill (process S) was followed by homogenization at selected pressures using Gaulin homogenizer or microfluidizer-throttling or CFHPT system. The combined process M and
CFHPT treated samples at the highest pressure showed the smallest particle size and the highest apparent viscosity. All samples showed pseudoplastic flow behavior. Ultrastructural images elucidated particle microstructure in the soymilk and homogeneity
of suspended particles. The very small fat globules at highest CFHPT pressure treatment of process M were seen entrapped in the network and was uniformly distributed. Thus combined process M and the highest CFHPT pressure was considered the best
treatment. Therefore, the high pressure throttling process will allow utilization of the whole soybean to produce excellent quality soymilk with high emulsion stability. The increase in the CFHPT flow rate significantly affected size reduction of
particles of soymilk. The empirical models were established which can be used to predict the size of particles in soymilk, at different volume fractions, processed using high pressure throttling processes at various pressures and flow rates. Consumer
acceptability test showed that more research is needed to make a soymilk that appeal to the taste of the American consumer before the CFHPT process can be used commercially to produce soymilk. Thus, soymilk with all the essential solids can be made
available to the public and processors benefit from the high processing yields since none of the essential solids of the beans are discarded.
Subjects/Keywords: high pressure throttling; soymilk; particle size distribution; rheological properties; ultrastructural properties
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APA ·
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Manager
APA (6th Edition):
Sivanandan, L. (2014). Characterization of soymilk produced by continuous flow high pressure throttling process. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/24494
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sivanandan, Litha. “Characterization of soymilk produced by continuous flow high pressure throttling process.” 2014. Thesis, University of Georgia. Accessed January 17, 2021.
http://hdl.handle.net/10724/24494.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sivanandan, Litha. “Characterization of soymilk produced by continuous flow high pressure throttling process.” 2014. Web. 17 Jan 2021.
Vancouver:
Sivanandan L. Characterization of soymilk produced by continuous flow high pressure throttling process. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10724/24494.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sivanandan L. Characterization of soymilk produced by continuous flow high pressure throttling process. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/24494
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
5.
Li, Jian.
IGNITION TRANSIENT IN AN ETHYLENE FUELED SCRAMJET ENGINE WITH AIR THROTTLING
.
Degree: 2009, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/9560
► This research focuses on the modeling and simulation of ignition transient and subsequent combustion dynamics in an ethylene fueled supersonic combustion ramjet (scramjet) engine. The…
(more)
▼ This research focuses on the modeling and simulation of ignition transient and subsequent combustion dynamics in an ethylene fueled supersonic combustion ramjet (scramjet) engine. The primary objectives are: 1) to establish an efficient and accurate numerical framework for the treatment of unsteady flow and flame dynamics in scramjet propulsion systems; and 2) to investigate the effects of transverse air
throttling on flow development and fuel-air mixing, and to identify its positive influence on ignition and flameholding in a scramjet combustor; and 3) to construct a detailed study investigating ignition transient to identify underlying essential mechanisms by means of air
throttling implementation technique.
A comprehensive numerical study of the combustion dynamics in a scramjet combustor is performed. The analysis treats the conservation equations in three dimensions and takes into account finite-rate chemical reactions and variable thermophysical properties for a multi-component reacting flow. Menter’s k-ω SST two-equation turbulence model is implemented, as it performs well for shear-layer flows and wall turbulence effects. The governing equations and the associated boundary conditions are solved using a density-based finite-volume approach and four-stage Runge-Kutta scheme to utilize explicit time marching. The code is parallelized using the domain decomposition technique and message passing interface (MPI). The theoretical formulation and numerical scheme is first validated with two test cases including turbulent flow over a flat plat and a two-dimensional oblique shock wave, and then validated with engine test data.
The analysis is first employed to a detailed investigation into the flow development and fuel-air mixing in the scramjet engine for non-reacting flow at Mach 5 flight condition. As the air
throttling is implemented to increase the combustor pressure, a series of subsequent oblique shock waves following the fuel injectors is generated to separate the wall boundary layer, and lead to a dramatic increase in the fuel/air mixing. The detailed investigation reveals enhanced fuel-air mixing primarily results from elevated vorticity over combustor and cavity, as well as from increased residence time.
Effort is then expended to study the ignition and subsequent reacting flow in the modeled combustor. The ignition transient and flame development are comprehensively studied to investigate the influence of air
throttling implementation on ignition and flameholding. The time history of combustion indicates that the engine model can hardly offer the ignition under the given flight condition in the absence of air
throttling, as the ignition of ethylene fuel flow on the cowl surface fails to be initiated. Calculation is then employed to demonstrate the significant flow accommodation induced by air
throttling implementation, including subsequent decrease in flow velocity and increases in temperature and pressure in the combustor. Autoignition occurs on the cowl surface due to extended…
Advisors/Committee Members: Dr Vigor Yang, Dissertation Advisor/Co-Advisor, Vigor Yang, Committee Chair/Co-Chair, Daniel Connell Haworth, Committee Member, John Harlan Mahaffy, Committee Member, Robert Francis Kunz, Committee Member, Robert John Santoro, Committee Member.
Subjects/Keywords: supersonic combustion; Scramjet; CFD; air throttling
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APA ·
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Manager
APA (6th Edition):
Li, J. (2009). IGNITION TRANSIENT IN AN ETHYLENE FUELED SCRAMJET ENGINE WITH AIR THROTTLING
. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/9560
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Li, Jian. “IGNITION TRANSIENT IN AN ETHYLENE FUELED SCRAMJET ENGINE WITH AIR THROTTLING
.” 2009. Thesis, Penn State University. Accessed January 17, 2021.
https://submit-etda.libraries.psu.edu/catalog/9560.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Li, Jian. “IGNITION TRANSIENT IN AN ETHYLENE FUELED SCRAMJET ENGINE WITH AIR THROTTLING
.” 2009. Web. 17 Jan 2021.
Vancouver:
Li J. IGNITION TRANSIENT IN AN ETHYLENE FUELED SCRAMJET ENGINE WITH AIR THROTTLING
. [Internet] [Thesis]. Penn State University; 2009. [cited 2021 Jan 17].
Available from: https://submit-etda.libraries.psu.edu/catalog/9560.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Li J. IGNITION TRANSIENT IN AN ETHYLENE FUELED SCRAMJET ENGINE WITH AIR THROTTLING
. [Thesis]. Penn State University; 2009. Available from: https://submit-etda.libraries.psu.edu/catalog/9560
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
6.
Stridh, Fredrik.
A Simple Throttling Concept for Multithreaded Application Servers.
Degree: 2009, , School of Computing
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2840
► Multithreading is today a very common technology to achieve concurrency within software. Today there exists three commonly used threading strategies for multithreaded application servers.…
(more)
▼ Multithreading is today a very common technology to achieve concurrency within software. Today there exists three commonly used threading strategies for multithreaded application servers. These are thread per client, thread per request and thread pool. Earlier studies has shown that the choice of threading strategy is not that important. Our measurements show that the choice of threading architecture becomes more important when the application comes under high load. We will in this study present a throttling concept which can give thread per client almost as good qualities as the thread pool strategy when it comes to performance. No architecture change is required. This concept has been evaluated on three types of hardware, ranging from 1 to 64 CPUs, using 6 alternatives loads and both in C and Java. We have also identified that there is a high correlation between average response times and the length of the run time queue. This can be used to construct a self tuning throttling algorithm that makes the introduction of the throttle concept even simpler, since it does require any configuring.
Subjects/Keywords: throttling; multithreaded; server; Software Engineering; Programvaruteknik
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APA (6th Edition):
Stridh, F. (2009). A Simple Throttling Concept for Multithreaded Application Servers. (Thesis). , School of Computing. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2840
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Stridh, Fredrik. “A Simple Throttling Concept for Multithreaded Application Servers.” 2009. Thesis, , School of Computing. Accessed January 17, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2840.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Stridh, Fredrik. “A Simple Throttling Concept for Multithreaded Application Servers.” 2009. Web. 17 Jan 2021.
Vancouver:
Stridh F. A Simple Throttling Concept for Multithreaded Application Servers. [Internet] [Thesis]. , School of Computing; 2009. [cited 2021 Jan 17].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2840.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Stridh F. A Simple Throttling Concept for Multithreaded Application Servers. [Thesis]. , School of Computing; 2009. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2840
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universitat Politècnica de València
7.
Ferrer Pérez, Joan Lluís.
DESIGN OF EFFICIENT PACKET MARKING-BASED CONGESTION MANAGEMENT TECHNIQUES FOR CLUSTER INTERCONNECTS
.
Degree: 2012, Universitat Politècnica de València
URL: http://hdl.handle.net/10251/18197
► El crecimiento de los computadores paralelos basados en redes de altas prestaciones ha aumentado el interés y esfuerzo de la comunidad investigadora en desarrollar nuevas…
(more)
▼ El crecimiento de los computadores paralelos basados en redes de altas prestaciones ha aumentado el interés y esfuerzo de la comunidad investigadora en desarrollar nuevas técnicas que permitan obtener el mejor rendimiento de estas redes. En particular, el desarrollo de nuevas técnicas que permitan un encaminamiento eficiente y que reduzcan la latencia de los paquetes, aumentando así la productividad de la red. Sin embargo, una alta tasa de utilización de la red podría conllevar el que se conoce como "congestión de red", el cual puede causar una degradación del rendimiento.
El control de la congestión en redes multietapa es un problema importante que no está completamente resuelto. Con el fin de evitar la degradación del rendimiento de la red cuando aparece congestión, se han propuesto diferentes mecanismos para el control de la congestión. Muchos de estos mecanismos están basados en notificación explícita de la congestión. Para este propósito, los switches detectan congestión y dependiendo de la estrategia aplicada, los paquetes son marcados con la finalidad de advertir a los nodos origenes. Como respuesta, los nodos origenes aplican acciones correctivas para ajustar su tasa de inyección de paquetes.
El propósito de esta tesis es analizar las diferentes estratégias de detección y corrección de la congestión en redes multietapa, y proponer nuevos mecanismos de control de la congestión encaminados a este tipo de redes sin descarte de paquetes. Las nuevas propuestas están basadas en una estrategia más refinada de marcaje de paquetes en combinación con un conjunto de acciones correctivas justas que harán al mecanismo capaz de controlar la congestión de manera efectiva con independencia del grado de congestión y de las condiciones de tráfico.
Advisors/Committee Members: Baydal Cardona, María Elvira (advisor), Robles Martínez, Antonio (advisor), López Rodríguez, Pedro Juan (advisor).
Subjects/Keywords: Congestion management;
Multistage interconnection networks;
Packet marking strategy;
Explicit congestion notification;
Message throttling
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APA ·
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MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ferrer Pérez, J. L. (2012). DESIGN OF EFFICIENT PACKET MARKING-BASED CONGESTION MANAGEMENT TECHNIQUES FOR CLUSTER INTERCONNECTS
. (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/18197
Chicago Manual of Style (16th Edition):
Ferrer Pérez, Joan Lluís. “DESIGN OF EFFICIENT PACKET MARKING-BASED CONGESTION MANAGEMENT TECHNIQUES FOR CLUSTER INTERCONNECTS
.” 2012. Doctoral Dissertation, Universitat Politècnica de València. Accessed January 17, 2021.
http://hdl.handle.net/10251/18197.
MLA Handbook (7th Edition):
Ferrer Pérez, Joan Lluís. “DESIGN OF EFFICIENT PACKET MARKING-BASED CONGESTION MANAGEMENT TECHNIQUES FOR CLUSTER INTERCONNECTS
.” 2012. Web. 17 Jan 2021.
Vancouver:
Ferrer Pérez JL. DESIGN OF EFFICIENT PACKET MARKING-BASED CONGESTION MANAGEMENT TECHNIQUES FOR CLUSTER INTERCONNECTS
. [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2012. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10251/18197.
Council of Science Editors:
Ferrer Pérez JL. DESIGN OF EFFICIENT PACKET MARKING-BASED CONGESTION MANAGEMENT TECHNIQUES FOR CLUSTER INTERCONNECTS
. [Doctoral Dissertation]. Universitat Politècnica de València; 2012. Available from: http://hdl.handle.net/10251/18197
University of Minnesota
8.
Tian, Hao.
Study of Active Valve Timing on Efficient Hydraulic Piston Motor Operations.
Degree: PhD, Mechanical Engineering, 2016, University of Minnesota
URL: http://hdl.handle.net/11299/185632
► Valve timing is critical to the performance of hydraulic piston motors and pumps. With non-optimal valve timing, the pressure differential across the valve during a…
(more)
▼ Valve timing is critical to the performance of hydraulic piston motors and pumps. With non-optimal valve timing, the pressure differential across the valve during a valve opening or closing can be significant, causing transitional throttling loss and reducing the energy efficiency. The goal of this thesis is to provide a fundamental understanding of the role of valve timing and propose a viable active valve solution for better efficiency of hydraulic pumps and motors. Previously, researchers have proposed a variety of valve timing models based on analytical modeling, numerical simulation, and optimization. However, many critical questions, such as the relationship between the valve timing and throttling energy loss, the meaning of the valve timing optimality, and the influence of the fluid compressibility with entrained gas, have not been fully answered. Prior work on valves with active timing have focused on reducing the valve transition time, leakage, and dead volume. The cylindrical rotary valve architecture has been found to be a promising solution, provided that the leakage issue is solved. In this research, a new two-phase analytical valve timing solution, a complete active motor-valve numerical model, a prototype cylindrical rotary valve, and a novel fluid compressibility experiment have been developed. Results have shown that the analytical valve timing solution is capable of capturing the trade-offs between throttling energy loss and output piston work. A full model of a motor was used to optimize valve timing for a specific operating condition. The numerical model was validated experimentally, where a prototype active rotary valve was integrated into a commercial pump. A rectified bulk modulus model was derived from a novel mass transfer experiment to determine the compressibility of oil with entrained gas based on an optical bubble size measurement. The contributions of the thesis are: (1) the validated analytical and numerical models that allow finding the optimal valve timing as a function of the operating conditions, (2) a new active valve architecture that enables variable valve timing motor/pump, and (3) a rectified fluid compressibility model based on a lumped interfacial mass transport equation that predicts the effective fluid bulk modulus dynamically.
Subjects/Keywords: Digital motor; Effective bulk modulus; Efficiency; Hydraulic valve timing; Rotary valve; Throttling energy loss
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APA (6th Edition):
Tian, H. (2016). Study of Active Valve Timing on Efficient Hydraulic Piston Motor Operations. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/185632
Chicago Manual of Style (16th Edition):
Tian, Hao. “Study of Active Valve Timing on Efficient Hydraulic Piston Motor Operations.” 2016. Doctoral Dissertation, University of Minnesota. Accessed January 17, 2021.
http://hdl.handle.net/11299/185632.
MLA Handbook (7th Edition):
Tian, Hao. “Study of Active Valve Timing on Efficient Hydraulic Piston Motor Operations.” 2016. Web. 17 Jan 2021.
Vancouver:
Tian H. Study of Active Valve Timing on Efficient Hydraulic Piston Motor Operations. [Internet] [Doctoral dissertation]. University of Minnesota; 2016. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/11299/185632.
Council of Science Editors:
Tian H. Study of Active Valve Timing on Efficient Hydraulic Piston Motor Operations. [Doctoral Dissertation]. University of Minnesota; 2016. Available from: http://hdl.handle.net/11299/185632
Virginia Tech
9.
Li, Dong.
Scalable and Energy Efficient Execution Methods for Multicore Systems.
Degree: PhD, Computer Science, 2011, Virginia Tech
URL: http://hdl.handle.net/10919/26098
► Multicore architectures impose great pressure on resource management. The exploration spaces available for resource management increase explosively, especially for large-scale high end computing systems. The…
(more)
▼ Multicore architectures impose great pressure on resource management. The exploration spaces available for resource management increase explosively, especially for large-scale high end computing systems. The availability of abundant parallelism causes scalability concerns at all levels. Multicore architectures also impose pressure on power management. Growth in the number of cores causes continuous growth in power.
In this dissertation, we introduce methods and techniques to enable scalable and energy efficient execution of parallel applications on multicore architectures. We study strategies and methodologies that combine DCT and DVFS for the hybrid MPI/OpenMP programming model. Our algorithms yield substantial energy saving (8.74% on average and up to 13.8%) with either negligible performance loss or performance gain (up to 7.5%).
To save additional energy for high-end computing systems, we propose a power-aware MPI task aggregation framework. The framework predicts the performance effect of task aggregation in both computation and communication phases and its impact in terms of execution time and energy of MPI programs. Our framework provides accurate predictions that lead to substantial energy saving through aggregation (64.87% on average and up to 70.03%) with tolerable performance loss (under 5%).
As we aggregate multiple MPI tasks within the same node, we have the scalability concern of memory registration for high performance networking. We propose a new memory registration/deregistration strategy to reduce registered memory on multicore architectures with helper threads. We investigate design polices and performance implications of the helper thread approach. Our method efficiently reduces registered memory (23.62% on average and up to 49.39%) and avoids memory registration/deregistration costs for reused communication memory. Our system enables the execution of application input sets that could not run to the completion with the memory registration limitation.
Advisors/Committee Members: Cameron, Kirk W. (committeechair), de Supinski, Bronis R. (committee member), Feng, Wu-Chun (committee member), Ma, Xiaosong (committee member), Nikolopoulos, Dimitrios S. (committeecochair).
Subjects/Keywords: Performance Modeling and Analysis; Multicore Processors; Power-Aware Computing; Concurrency Throttling; High-Performance Computing
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APA (6th Edition):
Li, D. (2011). Scalable and Energy Efficient Execution Methods for Multicore Systems. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/26098
Chicago Manual of Style (16th Edition):
Li, Dong. “Scalable and Energy Efficient Execution Methods for Multicore Systems.” 2011. Doctoral Dissertation, Virginia Tech. Accessed January 17, 2021.
http://hdl.handle.net/10919/26098.
MLA Handbook (7th Edition):
Li, Dong. “Scalable and Energy Efficient Execution Methods for Multicore Systems.” 2011. Web. 17 Jan 2021.
Vancouver:
Li D. Scalable and Energy Efficient Execution Methods for Multicore Systems. [Internet] [Doctoral dissertation]. Virginia Tech; 2011. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10919/26098.
Council of Science Editors:
Li D. Scalable and Energy Efficient Execution Methods for Multicore Systems. [Doctoral Dissertation]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/26098
Penn State University
10.
Casiano, Matthew Joseph.
Extensions to the Time Lag Models for Practical Application to Rocket Engine Stability Design
.
Degree: 2010, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/10688
► The combustion instability problem in liquid-propellant rocket engines (LREs) has remained a tremendous challenge since their discovery in the 1930s. Improvements are usually made in…
(more)
▼ The combustion instability problem in liquid-propellant rocket engines (LREs) has remained a tremendous challenge since their discovery in the 1930s. Improvements are usually made in solving the combustion instability problem primarily using computational fluid dynamics (CFD) and also by testing demonstrator engines. Another approach is to use analytical models. Analytical models can be used such that design, redesign, or improvement of an engine system is feasible in a relatively short period of time. Improvements to the analytical models can greatly aid in design efforts.
A thorough literature review is first conducted on liquid-propellant rocket engine (LRE)
throttling.
Throttling is usually studied in terms of vehicle descent or ballistic missile control however there are many other cases where
throttling is important. It was found that combustion instabilities are one of a few major issues that occur during deep
throttling (other major issues are heat transfer concerns, performance loss, and pump dynamics). In the past and again recently, gas injected into liquid propellants has shown to be a viable solution to throttle engines and to eliminate some forms of combustion instability. This review uncovered a clever solution that was used to eliminate a chug instability in the Common Extensible Cryogenic Engine (CECE), a modified RL10 engine.
A separate review was also conducted on classic time lag combustion instability models. Several new stability models are developed by incorporating important features to the classic and contemporary models, which are commonly used in the aerospace rocket industry. The first two models are extensions of the original Crocco and Cheng concentrated combustion model with feed system contributions. A third new model is an extension to the Wenzel and Szuch double-time lag model also with feed system contributions.
The first new model incorporates the appropriate injector acoustic boundary condition which is neglected in contemporary models. This new feature shows that the injector boundary can play a significant role for combustion stability, especially for gaseous injection systems or a system with an injector orifice on the order of the size of the chamber. The second new model additionally accounts for resistive effects. Advanced signal analysis techniques are used to extract frequency-dependent damping from a gas generator component data set. The damping values are then used in the new stability model to more accurately represent the chamber response of the component. The results show a more realistic representation of stability margin by incorporating the appropriate damping effects into the chamber response from data. The original Crocco model, a contemporary model, and the two new models are all compared and contrasted to a marginally stable test case showing their applicability. The model that incorporates resistive aspects shows the best comparison to the test data. Parametrics are also examined to show the influence of the new features…
Advisors/Committee Members: Vigor Yang, Dissertation Advisor/Co-Advisor, Domenic Adam Santavicca, Committee Chair/Co-Chair, Vigor Yang, Committee Chair/Co-Chair, Richard A Yetter, Committee Member, Andre Louis Boehman, Committee Member, Tomas E Nesman, Committee Member.
Subjects/Keywords: concentrated combustion; helium injection; time lag models; combustion stability; throttling; damping
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APA (6th Edition):
Casiano, M. J. (2010). Extensions to the Time Lag Models for Practical Application to Rocket Engine Stability Design
. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/10688
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Casiano, Matthew Joseph. “Extensions to the Time Lag Models for Practical Application to Rocket Engine Stability Design
.” 2010. Thesis, Penn State University. Accessed January 17, 2021.
https://submit-etda.libraries.psu.edu/catalog/10688.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Casiano, Matthew Joseph. “Extensions to the Time Lag Models for Practical Application to Rocket Engine Stability Design
.” 2010. Web. 17 Jan 2021.
Vancouver:
Casiano MJ. Extensions to the Time Lag Models for Practical Application to Rocket Engine Stability Design
. [Internet] [Thesis]. Penn State University; 2010. [cited 2021 Jan 17].
Available from: https://submit-etda.libraries.psu.edu/catalog/10688.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Casiano MJ. Extensions to the Time Lag Models for Practical Application to Rocket Engine Stability Design
. [Thesis]. Penn State University; 2010. Available from: https://submit-etda.libraries.psu.edu/catalog/10688
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Indian Institute of Science
11.
Satrawala, Amar Nath.
RETHROTTLE : Execution Throttling In The REDEFINE SoC Architecture.
Degree: MSc Engg, Faculty of Engineering, 2011, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/1017
► REDEFINE is a reconfigurable SoC architecture that provides a unique platform for high performance and low power computing by exploiting the synergistic interaction between coarse…
(more)
▼ REDEFINE is a reconfigurable SoC architecture that provides a unique platform for high performance and low power computing by exploiting the synergistic interaction between coarse grain dynamic dataflow model of computation (to expose abundant parallelism in the applications) and runtime composition of efficient compute structures (on the reconfigurable computation resources). Computer architectures based on the dynamic dataflow model of computation have to be an infinite resource implementation to be able to exploit all available parallelism in all applications. It is not feasible for any real architectural implementation. When limited resource implementations are considered, there is a possibility of loss of performance (inability to efficiently exploit available parallelism). In this thesis, we study the
throttling of execution in the REDEFINE architecture to maximize the architecture efficiency. We have formulated it as a design space exploration problem at two levels i.e. architectural configurations and
throttling schemes.
Reduced feature/high level simulation or feature specific analytical approaches are very useful for the selective study/exploration of early in design phase architectures/systems. Our approach is similar to that of SEASAME Framework which is used for the study of MPSoC (Multiprocessor SoC) architectures. We have used abstraction (feature reduction) at the levels of architecture and model of computation to make the problem approachable and practically feasible. A feature specific fast hybrid (mixed level) simulation framework for the early in design phase study is developed and implemented for the huge design space exploration (1284
throttling schemes, 128 architectural configurations and 10 applications i.e. 1.6 million executions).
We have done performance modeling in terms of selection of important performance criteria, ranking of the explored
throttling schemes and investigation of the effectiveness of the design space exploration using statistical hypothesis testing. We found some interesting obvious/intuitive and some non-obvious/counterintuitive results. The two performance criteria namely Exec.T and Avg.TU were found sufficient to represent the performance and the resource usage characteristics of the architecture independent of the
throttling schemes, the architectural configurations and the applications. The ranking of the
throttling schemes based on the selected performance criteria is found to be statistically very significant. The intuitive
throttling schemes span the range of performance from the best to the worst. We found absence of trade-off amongst all of the performance criteria. The best
throttling schemes give appreciable overall performance (25%) and resource usage (37%) gains in the
throttling unit simultaneously. The design space exploration of the
throttling schemes is found to be fine and uniform.
Advisors/Committee Members: Nandy, S K (advisor).
Subjects/Keywords: SoC Architecture; Computer Architecture; Semiconductor-on-Chip Architecture; Dataflow Models; Throttling; Computer Simulation; REDEFINE Architecture; Computer Architecture - Modeling; Hybrid Computer Simulation; Von Neumann Architecture; Coarse Grain; Computer Science
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APA (6th Edition):
Satrawala, A. N. (2011). RETHROTTLE : Execution Throttling In The REDEFINE SoC Architecture. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1017
Chicago Manual of Style (16th Edition):
Satrawala, Amar Nath. “RETHROTTLE : Execution Throttling In The REDEFINE SoC Architecture.” 2011. Masters Thesis, Indian Institute of Science. Accessed January 17, 2021.
http://etd.iisc.ac.in/handle/2005/1017.
MLA Handbook (7th Edition):
Satrawala, Amar Nath. “RETHROTTLE : Execution Throttling In The REDEFINE SoC Architecture.” 2011. Web. 17 Jan 2021.
Vancouver:
Satrawala AN. RETHROTTLE : Execution Throttling In The REDEFINE SoC Architecture. [Internet] [Masters thesis]. Indian Institute of Science; 2011. [cited 2021 Jan 17].
Available from: http://etd.iisc.ac.in/handle/2005/1017.
Council of Science Editors:
Satrawala AN. RETHROTTLE : Execution Throttling In The REDEFINE SoC Architecture. [Masters Thesis]. Indian Institute of Science; 2011. Available from: http://etd.iisc.ac.in/handle/2005/1017
12.
Kim, Hyun Jin.
Improving Hardware Multithreading in General Purpose Graphics Processing Units.
Degree: Computer Science, 2017, UCLA
URL: http://www.escholarship.org/uc/item/7f40m7jn
► General-purpose graphics processing unit (GPGPU) is one of the most popular many-core acceleratorsthat deliver a massive computing power in parallel applications. GPGPUs mainlyrely on the…
(more)
▼ General-purpose graphics processing unit (GPGPU) is one of the most popular many-core acceleratorsthat deliver a massive computing power in parallel applications. GPGPUs mainlyrely on the hardware multithreading to hide a short pipeline stall and a long memory latency.Thus, the performance of GPGPU can be signicantly aected by how GPGPU'shardware multithreading is applied. However, nding the optimal hardware multithreadingis a complex problem since there are many aspects to be considered. This work studies themechanisms for improving the eectiveness of hardware multithreading. First, it studiesthe various scheduling policies and proposes an adaptive scheduling policy that chooses thebest scheduling policy at runtime. In addition, it proposes simple but eective warp throttlingmechanism that can increase the cache locality. Furthermore, it proposes a hardwareprefetching mechanism to extend the memory latency hiding degree of hardware multithreading.Finally, it shows how a limited scalability of the conventional cache miss handling architectureconstrains the degree of hardware multithreading and proposes the highly scalablecache miss handling architecture.
Subjects/Keywords: Computer science; GPGPU; MSHR; Prefetching; Warp Scheduling; Warp Throttling
…Prefetch Throttling . . . . . . . . . . . . . . . . .
60
4.3
Methodology… …throttling mechanisms normalized to LAWS . . . . . . . . .
2.9
26
Overall performance of various… …scheduling policies and throttling mechanisms
normalized to LAWS (gmean*: geometric mean… …Overview of Throttling Unit on LAWS . . . . . . . . . . . . . . . . . . . . .
37
3.3
Overall… …performance of various throttling mechanisms normalized to LAWS .
42
3.4
Perfromance of various…
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MLA ·
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Manager
APA (6th Edition):
Kim, H. J. (2017). Improving Hardware Multithreading in General Purpose Graphics Processing Units. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/7f40m7jn
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kim, Hyun Jin. “Improving Hardware Multithreading in General Purpose Graphics Processing Units.” 2017. Thesis, UCLA. Accessed January 17, 2021.
http://www.escholarship.org/uc/item/7f40m7jn.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kim, Hyun Jin. “Improving Hardware Multithreading in General Purpose Graphics Processing Units.” 2017. Web. 17 Jan 2021.
Vancouver:
Kim HJ. Improving Hardware Multithreading in General Purpose Graphics Processing Units. [Internet] [Thesis]. UCLA; 2017. [cited 2021 Jan 17].
Available from: http://www.escholarship.org/uc/item/7f40m7jn.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kim HJ. Improving Hardware Multithreading in General Purpose Graphics Processing Units. [Thesis]. UCLA; 2017. Available from: http://www.escholarship.org/uc/item/7f40m7jn
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Brno University of Technology
13.
Štěpánek, Jindřich.
Technologie pro zkapalňování plynů a jeho využití a distribuce: Technology for liquefaction gases and its use and distributing.
Degree: 2019, Brno University of Technology
URL: http://hdl.handle.net/11012/26767
► This thesis deals with technologies for gas liquefaction and storage. The first section summarizes the development of liquefaction technology using expanders and throttling valves, followed…
(more)
▼ This thesis deals with technologies for gas liquefaction and storage. The first section summarizes the development of liquefaction technology using expanders and
throttling valves, followed by current technology. This is especially a rotary expanders. The storage technology is the above-ground storage of cryogenic tanks. The thesis includes proposals turbine wheels for liquefaction lines and included two proposals liquefaction cycles.
Advisors/Committee Members: Škorpík, Jiří (advisor), Kracík, Petr (referee).
Subjects/Keywords: Zkapalňování; kapalný metan; kapalný zemní plyn; radiální turbína; expandér; kondenzace; škrcení plynů; Joule – Thomsonův ventil.; Liquefaction; liquid methane; liquid natural gas; radial turbine; expander; condensation; throttling gas; Joule - Thomson valve.
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APA (6th Edition):
Štěpánek, J. (2019). Technologie pro zkapalňování plynů a jeho využití a distribuce: Technology for liquefaction gases and its use and distributing. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/26767
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Štěpánek, Jindřich. “Technologie pro zkapalňování plynů a jeho využití a distribuce: Technology for liquefaction gases and its use and distributing.” 2019. Thesis, Brno University of Technology. Accessed January 17, 2021.
http://hdl.handle.net/11012/26767.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Štěpánek, Jindřich. “Technologie pro zkapalňování plynů a jeho využití a distribuce: Technology for liquefaction gases and its use and distributing.” 2019. Web. 17 Jan 2021.
Vancouver:
Štěpánek J. Technologie pro zkapalňování plynů a jeho využití a distribuce: Technology for liquefaction gases and its use and distributing. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/11012/26767.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Štěpánek J. Technologie pro zkapalňování plynů a jeho využití a distribuce: Technology for liquefaction gases and its use and distributing. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/26767
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Brigham Young University
14.
Hinton, Michael Glenn.
Inter-Core Interference Mitigation in a Mixed Criticality System.
Degree: MS, 2020, Brigham Young University
URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=9648&context=etd
► In this thesis, we evaluate how well isolation can be achieved between two virtual machines within a mixed criticality system on a multi-core processor.…
(more)
▼ In this thesis, we evaluate how well isolation can be achieved between two virtual machines within a mixed criticality system on a multi-core processor. We achieve this isolation with Jailhouse, an open-source, minimalist hypervisor. We then enhance Jailhouse with core throttling, a technique we use to minimize inter-core interference between VMs. Then, we run workloads with and without core throttling to determine the effect throttling has on interference between a non-real time VM and a real-time VM. We find that Jailhouse provides excellent isolation between VMs even without throttling, and that core throttling suppresses the remaining inter-core interference to a large extent.
Subjects/Keywords: hypervisor; Jailhouse; virtual machine; mixed criticality system; real-time operating system; core throttling; inter-core interference; interference mitigation; Electrical and Computer Engineering
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APA (6th Edition):
Hinton, M. G. (2020). Inter-Core Interference Mitigation in a Mixed Criticality System. (Masters Thesis). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=9648&context=etd
Chicago Manual of Style (16th Edition):
Hinton, Michael Glenn. “Inter-Core Interference Mitigation in a Mixed Criticality System.” 2020. Masters Thesis, Brigham Young University. Accessed January 17, 2021.
https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=9648&context=etd.
MLA Handbook (7th Edition):
Hinton, Michael Glenn. “Inter-Core Interference Mitigation in a Mixed Criticality System.” 2020. Web. 17 Jan 2021.
Vancouver:
Hinton MG. Inter-Core Interference Mitigation in a Mixed Criticality System. [Internet] [Masters thesis]. Brigham Young University; 2020. [cited 2021 Jan 17].
Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=9648&context=etd.
Council of Science Editors:
Hinton MG. Inter-Core Interference Mitigation in a Mixed Criticality System. [Masters Thesis]. Brigham Young University; 2020. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=9648&context=etd
Virginia Tech
15.
Teye, Frederick David.
Continuous flash extraction of alcohols from fermentation broth.
Degree: MS, Biological Systems Engineering, 2009, Virginia Tech
URL: http://hdl.handle.net/10919/31418
► A new method of in situ extraction of alcohols from fermentation broth was investigated. The extraction method exploited the latent advantages of the non-equilibrium phase…
(more)
▼ A new method of in situ extraction of alcohols from fermentation broth was investigated. The extraction method exploited the latent advantages of the non-equilibrium phase interaction of the fluid system in the flash tank to effectively recover the alcohol. Carbon dioxide gas ranging from 4.2L/min to 12.6L/min was used to continuously strip 2 and 12% (v/v) ethanol solution in a fermentor with a recycle. Ethanol and water in the stripped gas was recovered by compressing and then flashing into a flash tank that was maintained at 5 to 70bar and 5 to 55 °C where two immiscible phases comprising CO2-rich phase (top layer) and H2O-rich phase (bottom layer) were formed. The H2O-rich bottom layer was collected as the Bottoms. The CO2-rich phase was continuously throttled producing a condensate (Tops) as a result of the Joule-Thompson cooling effect. The total ethanol recovered from the extraction scheme was 46.0 to 80% for the fermentor containing 2% (v/v) ethanol and 57 to 89% for the fermentor containing 12% (v/v) ethanol. The concentration of ethanol in the Bottoms ranged from 8.0 to 14.9 %(v/v) for the extraction from the 2 %(v/v) ethanol solution and 40.0 to 53.8 %(v/v) for the 12% (v/v) fermentor ethanol extraction. The Bottoms concentration showed a fourfold increase compared to the feed. The ethanol concentration of the Tops were much higher with the highest at approx. 90% (v/v) ethanol, however the yields were extremely low. Compression work required ranged from 6.4 to 20.1 MJ/kg ethanol recovered from the gas stream in the case of 12% (v/v) ethanol in fermentor. The energy requirement for the 2% (v/v) extraction was 84MJ/kg recovered ethanol. The measured Joule-Thompson cooling effect for the extraction scheme was in the range of 10 to 20% the work of compressing the gas. The lowest measured throttle valve temperature was -47 °C at the flash tank conditions of 70bar and 25 °C. Optimization of the extraction scheme showed that increasing the temperature of the flash tank reduced the amount of ethanol recovered. Increasing the pressure of the flash tank increased the total ethanol recovered but beyond 45bar it appeared to reduce the yield. The 12.6L/min carbon dioxide flow rate favored the high pressure(70bar) extraction whiles 4.2L/min appeared to favor the low pressure(40bar) extraction. The studies showed that the extraction method could potentially be used to recover ethanol and other fermentation products.
Advisors/Committee Members: Agblevor, Foster Aryi (committeechair), Zhang, Chenming Mike (committee member), Achenie, Luke E. K. (committee member).
Subjects/Keywords: saturation temperature; equilibrium; Flashing; Bottoms; Tops; critical pressure; gas partition; Joule-Thompson coefficient; critical temperature; isothermal flash tank; throttling; saturation pressure
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APA ·
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Manager
APA (6th Edition):
Teye, F. D. (2009). Continuous flash extraction of alcohols from fermentation broth. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/31418
Chicago Manual of Style (16th Edition):
Teye, Frederick David. “Continuous flash extraction of alcohols from fermentation broth.” 2009. Masters Thesis, Virginia Tech. Accessed January 17, 2021.
http://hdl.handle.net/10919/31418.
MLA Handbook (7th Edition):
Teye, Frederick David. “Continuous flash extraction of alcohols from fermentation broth.” 2009. Web. 17 Jan 2021.
Vancouver:
Teye FD. Continuous flash extraction of alcohols from fermentation broth. [Internet] [Masters thesis]. Virginia Tech; 2009. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10919/31418.
Council of Science Editors:
Teye FD. Continuous flash extraction of alcohols from fermentation broth. [Masters Thesis]. Virginia Tech; 2009. Available from: http://hdl.handle.net/10919/31418
University of Florida
16.
Mahmoud, Ahmad.
Analytical and Experimental Investigation of Rotary-Vane Two-Phase Expanders in Vapor Compression Refrigeration Systems.
Degree: PhD, Mechanical Engineering - Mechanical and Aerospace Engineering, 2008, University of Florida
URL: https://ufdc.ufl.edu/UFE0022592
► The refrigeration and air-conditioning community has been searching for environmentally friendly refrigerants and ways to improve energy efficiency and to increase the potential for reductions…
(more)
▼ The refrigeration and air-conditioning community has been searching for environmentally friendly refrigerants and ways to improve energy efficiency and to increase the potential for reductions in system size and weight for some time. These system improvements may manifest themselves in numerous ways but significantly impact terrestrial logistics differently. This study investigates the analytical and experimental utilization of rotary-vane expanders as throttle valve replacements in vapor compression refrigeration systems with a specific application of these expanders in smaller deployable environmental control units. The findings support the conclusion that utilizing two-phase expanders in refrigeration systems is very promising. Mathematical models for a system-level parametric cycle analysis were developed to assess potential gains in the cycle coefficient of performance for R-22, R-134 and transcritical CO2 vapor compression technology. Optimization studies were conducted to determine the optimum performance of a refrigeration system
subject to constraints of size and weight of both the condenser heat transfer area and the size and weight of the two-phase expander. An exhaustive literature survey aids and validates the suitability of the type of positive-displacement expander used, after which comprehensive component level thermodynamic and fluid dynamic models of a rotary-vane expander were developed to establish the performance of this expansion device as a function of design and fluid parameters. This included rigorous modeling of irreversible loss mechanisms such as
throttling in the intake and exhaust ports, two-phase internal leakage, friction, re-compression, and under or over-expansion due to incorrect sizing of the expander or off-design operation. Results from these models were used to establish the operating principles of a two-phase rotary-vane expander. Experimental data gathered after modifying a conventional chiller with an alternative flow path, where a rotary-vane expander and dynamometer have been installed, were used to improve the fidelity of the analytical model developed. Issues such as real-time control to satisfy system-level constraints, expander sizing and operational speed and inadequate operation were addressed. The analytical model developed along with single-phase experimentation were used to understand and overcome component-level complications and inadequacies due to irreversible effects. ( en )
Advisors/Committee Members: Sherif, Sherif A. (committee chair), Ingley, Herbert A. (committee member), Goswami, Dharendra Y. (committee member), Ihas, Gary G. (committee member).
Subjects/Keywords: Air compressors; Evaporators; Inlets; Refrigerants; Refrigeration; Refrigerators; Throttling; Vanes; Vapors; Volume; expander, expansion, rotary, two, vapor
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APA (6th Edition):
Mahmoud, A. (2008). Analytical and Experimental Investigation of Rotary-Vane Two-Phase Expanders in Vapor Compression Refrigeration Systems. (Doctoral Dissertation). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0022592
Chicago Manual of Style (16th Edition):
Mahmoud, Ahmad. “Analytical and Experimental Investigation of Rotary-Vane Two-Phase Expanders in Vapor Compression Refrigeration Systems.” 2008. Doctoral Dissertation, University of Florida. Accessed January 17, 2021.
https://ufdc.ufl.edu/UFE0022592.
MLA Handbook (7th Edition):
Mahmoud, Ahmad. “Analytical and Experimental Investigation of Rotary-Vane Two-Phase Expanders in Vapor Compression Refrigeration Systems.” 2008. Web. 17 Jan 2021.
Vancouver:
Mahmoud A. Analytical and Experimental Investigation of Rotary-Vane Two-Phase Expanders in Vapor Compression Refrigeration Systems. [Internet] [Doctoral dissertation]. University of Florida; 2008. [cited 2021 Jan 17].
Available from: https://ufdc.ufl.edu/UFE0022592.
Council of Science Editors:
Mahmoud A. Analytical and Experimental Investigation of Rotary-Vane Two-Phase Expanders in Vapor Compression Refrigeration Systems. [Doctoral Dissertation]. University of Florida; 2008. Available from: https://ufdc.ufl.edu/UFE0022592
Brno University of Technology
17.
Machala, Jiří.
Používané principy chlazení v průmyslu: The used principles of industrial cooling.
Degree: 2019, Brno University of Technology
URL: http://hdl.handle.net/11012/16571
► This thesis summarizes the main cooling methods used in industrial cooling systems. It also discusses the fluids used in cooling, their influence on environment; ozone…
(more)
▼ This thesis summarizes the main cooling methods used in industrial cooling systems. It also discusses the fluids used in cooling, their influence on environment; ozone layer and climate change. The thesis closely describes the properties of ammonia and out of the many cooling methods on the market, it mostly concentrates on ammonia cooling systems. The thesis also discusses heat pumps, vortex tubes, and thermoelectric cooling.
Advisors/Committee Members: Kavička, František (advisor), Sekanina, Bohumil (referee).
Subjects/Keywords: chlazení; chladicí směs; chladivo; sytá pára; termodynamické oběhy; škrcení; kompresor; kondenzátor; regulační ventil; výparník; tepelné čerpadlo; vírová trubice; colling; cooling agent; refrigerant; saturated vapour; thermodynamic cycles; throttling; compressor unit; condenser; regulating valve; evaporating cooler; heat pumps; vortex tube
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APA (6th Edition):
Machala, J. (2019). Používané principy chlazení v průmyslu: The used principles of industrial cooling. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/16571
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Machala, Jiří. “Používané principy chlazení v průmyslu: The used principles of industrial cooling.” 2019. Thesis, Brno University of Technology. Accessed January 17, 2021.
http://hdl.handle.net/11012/16571.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Machala, Jiří. “Používané principy chlazení v průmyslu: The used principles of industrial cooling.” 2019. Web. 17 Jan 2021.
Vancouver:
Machala J. Používané principy chlazení v průmyslu: The used principles of industrial cooling. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/11012/16571.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Machala J. Používané principy chlazení v průmyslu: The used principles of industrial cooling. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/16571
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
18.
Shah, Ankur Savailal.
Prediction Models for Multi-dimensional Power-Performance Optimization on Many Cores.
Degree: MS, Computer Science, 2008, Virginia Tech
URL: http://hdl.handle.net/10919/31826
► Power has become a primary concern for HPC systems. Dynamic voltage and frequency scaling (DVFS) and dynamic concurrency throttling (DCT) are two software tools (or…
(more)
▼ Power has become a primary concern for HPC systems. Dynamic voltage and frequency scaling
(DVFS) and dynamic concurrency
throttling (DCT) are two software tools (or knobs) for reducing
the dynamic power consumption of HPC systems. To date, few works have considered the
synergistic integration of DVFS and DCT in performance-constrained systems, and, to the best of
our knowledge, no prior research has developed application-aware simultaneous DVFS and DCT
controllers in real systems and parallel programming frameworks. We present a multi-dimensional,
online performance prediction framework, which we deploy to address the problem of simultaneous
runtime optimization of DVFS, DCT, and thread placement on multi-core systems. We present
results from an implementation of the prediction framework in a runtime system linked to the Intel
OpenMP runtime environment and running on a real dual-processor quad-core system as well as
a dual-processor dual-core system. We show that the prediction framework derives near-optimal
settings of the three power-aware program adaptation knobs that we consider. Our overall runtime
optimization framework achieves significant reductions in energy (12.27% mean) and ED2
(29.6% mean), through simultaneous power savings (3.9% mean) and performance improvements
(10.3% mean). Our prediction and adaptation framework outperforms earlier solutions that adapt
only DVFS or DCT, as well as one that sequentially applies DCT then DVFS.
Further, our results indicate that prediction-based schemes for runtime adaptation compare
favorably and typically improve upon heuristic search-based approaches in both performance and
energy savings.
Advisors/Committee Members: Nikolopoulos, Dimitrios S. (committeechair), Cameron, Kirk W. (committee member), Feng, Wu-Chun (committee member).
Subjects/Keywords: concurrency throttling; power-aware computing; runtime adaptation; performance prediction; high-performance computing; Multicore processors
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APA (6th Edition):
Shah, A. S. (2008). Prediction Models for Multi-dimensional Power-Performance Optimization on Many Cores. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/31826
Chicago Manual of Style (16th Edition):
Shah, Ankur Savailal. “Prediction Models for Multi-dimensional Power-Performance Optimization on Many Cores.” 2008. Masters Thesis, Virginia Tech. Accessed January 17, 2021.
http://hdl.handle.net/10919/31826.
MLA Handbook (7th Edition):
Shah, Ankur Savailal. “Prediction Models for Multi-dimensional Power-Performance Optimization on Many Cores.” 2008. Web. 17 Jan 2021.
Vancouver:
Shah AS. Prediction Models for Multi-dimensional Power-Performance Optimization on Many Cores. [Internet] [Masters thesis]. Virginia Tech; 2008. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10919/31826.
Council of Science Editors:
Shah AS. Prediction Models for Multi-dimensional Power-Performance Optimization on Many Cores. [Masters Thesis]. Virginia Tech; 2008. Available from: http://hdl.handle.net/10919/31826
Virginia Tech
19.
Curtis-Maury, Matthew.
Improving the Efficiency of Parallel Applications on Multithreaded and Multicore Systems.
Degree: PhD, Computer Science, 2008, Virginia Tech
URL: http://hdl.handle.net/10919/26697
► The scalability of parallel applications executing on multithreaded and multicore multiprocessors is often quite limited due to large degrees of contention over shared resources on…
(more)
▼ The scalability of parallel applications executing on multithreaded and multicore multiprocessors is often quite limited due to large degrees of contention over shared resources on these systems. In fact, negative scalability frequently occurs such that a non-negligable performance loss is observed through the use of more processors and cores. In this dissertation, we present a prediction model for identifying efficient operating points of concurrency in multithreaded scientific applications in terms of both performance as a primary objective and power secondarily. We also present a runtime system that uses live analysis of hardware event rates through the prediction model to optimize applications dynamically. We discuss a dynamic, phase-aware performance prediction model (DPAPP), which combines statistical learning techniques, including multivariate linear regression and artificial neural networks, with runtime analysis of data collected from hardware event counters to locate optimal operating points of concurrency. We find that the scalability model achieves accuracy approaching 95%, sufficiently accurate to identify improved concurrency levels and thread placements from within real parallel scientific applications.
Using DPAPP, we develop a prediction-driven runtime optimization scheme, called ACTOR, which throttles concurrency so that power consumption can be reduced and performance can be set at the knee of the scalability curve of each parallel execution phase in an application. ACTOR successfully identifies and exploits program phases where limited scalability results in a performance loss through the use of more processing elements, providing simultaneous reductions in execution time by 5%-18% and power consumption by 0%-11% across a variety of parallel applications and architectures. Further, we extend DPAPP and ACTOR to include support for runtime adaptation of DVFS, allowing for the synergistic exploitation of concurrency
throttling and DVFS from within a single, autonomically-acting library, providing improved energy-efficiency compared to either approach in isolation.
Advisors/Committee Members: Nikolopoulos, Dimitrios S. (committeechair), Feng, Wu-Chun (committee member), Cameron, Kirk W. (committee member), de Supinski, Bronis R. (committee member), Ribbens, Calvin J. (committee member).
Subjects/Keywords: power-aware computing; high-performance computing; performance prediction; multicore processors; runtime adaptation; concurrency throttling
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Curtis-Maury, M. (2008). Improving the Efficiency of Parallel Applications on Multithreaded and Multicore Systems. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/26697
Chicago Manual of Style (16th Edition):
Curtis-Maury, Matthew. “Improving the Efficiency of Parallel Applications on Multithreaded and Multicore Systems.” 2008. Doctoral Dissertation, Virginia Tech. Accessed January 17, 2021.
http://hdl.handle.net/10919/26697.
MLA Handbook (7th Edition):
Curtis-Maury, Matthew. “Improving the Efficiency of Parallel Applications on Multithreaded and Multicore Systems.” 2008. Web. 17 Jan 2021.
Vancouver:
Curtis-Maury M. Improving the Efficiency of Parallel Applications on Multithreaded and Multicore Systems. [Internet] [Doctoral dissertation]. Virginia Tech; 2008. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10919/26697.
Council of Science Editors:
Curtis-Maury M. Improving the Efficiency of Parallel Applications on Multithreaded and Multicore Systems. [Doctoral Dissertation]. Virginia Tech; 2008. Available from: http://hdl.handle.net/10919/26697
20.
Zhu, Jingwei.
Experimental investigation of vortex tube and vortex nozzle for applications in air-conditioning, refrigeration, and heat pump systems.
Degree: MS, Mechanical Engineering, 2015, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/89096
► The Ranque-Hilsch vortex tube can separate an incoming high pressure fluid stream into two low pressure fluid streams with different temperatures. In this project, the…
(more)
▼ The Ranque-Hilsch vortex tube can separate an incoming high pressure fluid stream into two low pressure fluid streams with different temperatures. In this project, the applicability of expansion work recovery through vortex tube in heating and cooling cycles has been examined. Vortex tube thermal separation performance for air, R134a and carbon dioxide is provided. It has been found that when using single-phase vapor as the working fluid the vortex tube cold end temperature can always be lower than the isenthalpic expansion temperature, and whether the hot end temperature is higher than the inlet temperature depends on whether the fluid shows ideal gas behavior. Suitable vortex tube operating conditions are identified. Vortex tube cold-side isentropic efficiencies are measured to be higher than 20% for different fluids. Based on this knowledge, cooling and heating cycles with vortex tube have been proposed and their performance is calculated.
Expansion work recovery by two-phase ejector is known to be beneficial to vapor compression cycle performance. However, one of the biggest challenges with ejector vapor compression cycle is that the ejector cycle performance is sensitive to working condition changes which are common in real world applications. Different working conditions require different ejector geometries to achieve maximum performance. Slightly different geometries may result in substantially different COPs under the same conditions. The ejector motive nozzle throat diameter (motive nozzle restrictiveness) is one of the key parameters that can significantly affect COP. This thesis presents a new two-phase nozzle restrictiveness control mechanism which is possibly applicable to two-phase ejectors used in vapor compression cycles. This new control mechanism has the advantages of being simple and potentially less costly. It can also possibly avoid the additional frictional losses of previously proposed ejector control mechanisms using adjustable needle. An adjustable nozzle based on this new control mechanism is designed and manufactured for experiments with R134a. The experimental results show that, without changing the nozzle geometry, the nozzle restrictiveness on the two-phase flow can be adjusted over a wide range. Under the same inlet and outlet conditions, the mass flow rate through the nozzle can be reduced by 36% of the full load. This feature could be very useful for the future application of ejectors in mobile or stationary systems under changing working conditions.
Advisors/Committee Members: Elbel, Stefan (advisor).
Subjects/Keywords: ejector; vortex tube; vortex nozzle; air-conditioning; refrigeration; heat pump; expansion work recovery; throttling; energy efficiency; Coefficient of Performance (COP)
…those of Carnot cycle under the same
working conditions. Throttling devices such as… …the physical process during the
isenthalpic throttling is irreversible, which not only… …cycle efficiency.
COP reduction due to the isenthalpic process in the throttling device can be… …compression refrigeration cycles, throttling devices such as thermostatic
expansion valves and… …the isenthalpic throttling is irreversible, which not only reduces the
10
system cooling…
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APA ·
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APA (6th Edition):
Zhu, J. (2015). Experimental investigation of vortex tube and vortex nozzle for applications in air-conditioning, refrigeration, and heat pump systems. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/89096
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhu, Jingwei. “Experimental investigation of vortex tube and vortex nozzle for applications in air-conditioning, refrigeration, and heat pump systems.” 2015. Thesis, University of Illinois – Urbana-Champaign. Accessed January 17, 2021.
http://hdl.handle.net/2142/89096.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhu, Jingwei. “Experimental investigation of vortex tube and vortex nozzle for applications in air-conditioning, refrigeration, and heat pump systems.” 2015. Web. 17 Jan 2021.
Vancouver:
Zhu J. Experimental investigation of vortex tube and vortex nozzle for applications in air-conditioning, refrigeration, and heat pump systems. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/2142/89096.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhu J. Experimental investigation of vortex tube and vortex nozzle for applications in air-conditioning, refrigeration, and heat pump systems. [Thesis]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/89096
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Kent State University
21.
Olaleye, Olufunke I.
Symbiotic Audio Communication on Interactive
Transport.
Degree: MS, College of Arts and Sciences / Department of Computer
Science, 2007, Kent State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=kent1176438067
► Audio perception is highly susceptible to disturbance in temporal quality. In the event of congestion, audio datagrams suffer packet loss, delay and jitter. Compressed…
(more)
▼ Audio perception is highly susceptible to
disturbance in temporal quality. In the event of congestion, audio
datagrams suffer packet loss, delay and jitter. Compressed audio
appears as one of the most delicate traffic-type to handle on the
Internet. The recent advances in auditory perception promise
opportunities where a perceptually clever adaptive audio system can
respond to impending breakdown and support near flawless sound.
However, the major problem is receiving fast feedback from the
current Internet. Recently proposed TCP Interactive (iTCP) seems to
offer some interesting opportunity to perceptual audio. This is an
operational state equivalent to the conventional TCP except that
applications can optionally subscribe and receive selected local
end-point protocol events in real-time. In this
thesis, we implemented a novel symbiotic perceptual audio streaming
mechanism, that receives fast feedback from iTCP about congestion
and then responds appropriately. This mechanism combines the
quantization technique to accurately represent the audio signals
without distortion. The adaptive system reduces the encoding target
bit rate when congestion is detected which invariably reduces the
delay and jitter faced by audio traffic in the network during
congestion. We have tested it over the Internet. In this thesis, we
highlight the performance of this system and report on the dramatic
improvements in time-bounded streaming audio we
observed.
Advisors/Committee Members: Khan, Javed (Advisor).
Subjects/Keywords: TCP; iTCP; VoIP; congestion; voice; speech; audio; delay; jitter; packet loss; streaming audio; perceptual; quantization; symbiotic; throttling; exponential backoff; event notifier; event notification; MP3; distortion
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APA ·
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Export
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Manager
APA (6th Edition):
Olaleye, O. I. (2007). Symbiotic Audio Communication on Interactive
Transport. (Masters Thesis). Kent State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=kent1176438067
Chicago Manual of Style (16th Edition):
Olaleye, Olufunke I. “Symbiotic Audio Communication on Interactive
Transport.” 2007. Masters Thesis, Kent State University. Accessed January 17, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=kent1176438067.
MLA Handbook (7th Edition):
Olaleye, Olufunke I. “Symbiotic Audio Communication on Interactive
Transport.” 2007. Web. 17 Jan 2021.
Vancouver:
Olaleye OI. Symbiotic Audio Communication on Interactive
Transport. [Internet] [Masters thesis]. Kent State University; 2007. [cited 2021 Jan 17].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=kent1176438067.
Council of Science Editors:
Olaleye OI. Symbiotic Audio Communication on Interactive
Transport. [Masters Thesis]. Kent State University; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=kent1176438067
22.
ΠΑΤΣΑΤΖΗΣ, ΝΙΚΟΛΑΟΣ.
ΠΕΙΡΑΜΑΤΙΚΗ ΚΑΙ ΘΕΩΡΗΤΙΚΗ ΑΝΑΛΥΣΗ ΚΑΙ ΠΡΟΓΝΩΣΗ ΛΕΙΤΟΥΡΓΙΩΝ ΠΑΓΙΔΑΣ ΑΙΘΑΛΗΣ ΟΧΗΜΑΤΩΝ.
Degree: 1990, Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); Aristotle University Of Thessaloniki (AUTH)
URL: http://hdl.handle.net/10442/hedi/1486
► THIS PH.D THESIS INVESTIGATES AND FINALLY PREDICTS THE TRANSIENT RESPONSE OF A CERAMIC TRAP SYSTEM INSTALLED ON A DIESEL-POWERED VEHICLE. THIS CAN BE DONE FORVARIOUS…
(more)
▼ THIS PH.D THESIS INVESTIGATES AND FINALLY PREDICTS THE TRANSIENT RESPONSE OF A CERAMIC TRAP SYSTEM INSTALLED ON A DIESEL-POWERED VEHICLE. THIS CAN BE DONE FORVARIOUS TYPES OF DRIVING MODES, BY TAKING INTO DECOUNT INTERACTION OF A NUMBEROF PARAMETERS COMPRISING VEHICLE KINEMATICS, ENGINE OPERATION AND TRAP THERMALLOADING: A CONTROL PHILOSOPHY IS ALSO DEVELOPED AND OPTIMIZED FOR THE TOUCHING, REGENERATION AND PROTECTION OF THE TRAP FROM THERMAL STRESSES. THE ABOVE-MENTIONED TASKS ARE FULFILLED BY MEANS OF A MATHEMATICS RELATED TO THE TRAP OPERATING (EXHAUST GAS AND CERAMIC WALL TEMPERATURES, TRAP LOADING, REGENERATION EFFICIENCY. BY USE OF THIS MODEL AND WITH THE AID OF AN EXTENSIVE SERIES OF MEASUREMENTS IN LABORATORY AS WELL AS ON REAL WORLD CONDITIONS, THE CERAMIC SMOKE TRAP SYSTEM DEVELOPED BY THE LABORATORY OF APPLIED THERMODYNAMICS, ARISTOTLE UNIVERSITY, WAS FINALLY OPTIMIZED IN THE FOLLOWING DIRECTIONS: -SMOKE TRAPPING EFFICIENCY -REGENERATION CAPABILITY, -MINIMUM ADDITIONAL FUEL CONSUMPTION AND POWER LOSS, -FULL AUTOMATION OF THE SYSTEM OPERATION.
ΣΤΗΝ ΕΡΓΑΣΙΑ ΑΥΤΗ ΔΙΕΡΕΥΝΑΤΑΙ ΣΕ ΒΑΘΟΣ ΚΑΙ ΠΡΟΒΛΕΠΕΤΑΙ Η ΜΕΤΑΒΑΤΙΚΗ ΣΥΜΠΕΡΙΦΟΡΑΣΥΣΤΗΜΑΤΟΣ ΚΕΡΑΜΙΚΗΣ ΠΑΓΙΔΑΣ ΑΙΘΑΛΗΣ ΚΙΝΗΤΗΡΑ DIESEL ΓΙΑ ΟΠΟΙΟΔΗΠΟΤΕ ΣΕΝΑΡΙΟ ΚΙΝΗΣΗΣ ΤΟΥ ΟΧΗΜΑΤΟΣ, ΛΑΜΒΑΝΟΝΤΑΣ ΥΠΟΨΗ ΤΙΣ ΑΛΛΗΛΕΠΙΔΡΑΣΕΙΣ ΟΛΩΝ ΤΩΝ ΛΕΙΤΟΥΡΓΙΚΩΝ ΠΑΡΑΜΕΤΡΩΝ ΠΟΥ ΑΦΟΡΟΥΝ ΤΗΝ ΚΙΝΗΜΑΤΙΚΗ ΤΟΥ ΟΧΗΜΑΤΟΣ, ΤΗ ΛΕΙΤΟΥΡΓΙΑ ΤΟΥ ΚΙΝΗΤΗΡΑ, ΚΑΙ ΤΗ ΘΕΡΜΙΚΗ ΣΥΜΠΕΡΙΦΟΡΑ ΤΗΣ ΠΑΓΙΔΑΣ. ΠΑΡΑΛΛΗΛΑ ΑΝΑΠΤΥΣΣΕΤΑΙ ΚΑΙ ΒΕΛΤΙΣΤΟΠΟΙΕΙΤΑΙ ΦΙΛΟΣΟΦΙΑ ΕΛΕΓΧΟΥ ΤΩΝ ΔΙΕΡΓΑΣΙΩΝ ΦΟΡΤΙΣΗΣ, ΑΝΑΓΕΝΝΗΣΗΣ (ΑΥΤΟΚΑΘΑΡΙΣΜΟΥ)ΚΑΙ ΠΡΟΣΤΑΣΙΑΣ ΤΗΣ ΠΑΓΙΔΑΣ ΑΙΘΑΛΗΣ. ΓΙΑ ΤΗΝ ΕΠΙΤΕΥΞΗ ΤΩΝ ΠΑΡΑΠΑΝΩ ΑΝΑΠΤΥΣΣΕΤΑΙΜΑΘΗΜΑΤΙΚΟ ΜΟΝΤΕΛΟ ΠΡΟΣΟΜΟΙΩΣΗΣ. ΤΟ ΜΟΝΤΕΛΟ ΠΡΟΣΔΙΟΡΙΖΕΙ ΣΤΙΓΜΙΑΙΑ ΚΑΙ ΟΛΟΚΛΗΡΩΤΙΚΑ ΜΕΓΕΘΗ ΠΟΥ ΑΦΟΡΟΥΝ ΤΗΝ ΕΠΙΔΡΑΣΗ ΤΟΥ ΣΥΣΤΗΜΑΤΟΣ ΣΤΗΝ ΠΑΓΙΔΑ (ΘΕΡΜΟΚΡΑΣΙΕΣ ΚΑΥΣΑΕΡΙΟΥ, ΚΕΡΑΜΙΚΟΥ ΤΟΙΧΩΜΑΤΟΣ, ΦΟΡΤΙΣΗ, ΒΑΘΜΟΣ ΑΠΟΔΟΣΗΣ ΑΝΑΓΕΝΝΗΣΗΣ), ΤΗΝ ΕΠΙΔΡΑΣΗ ΣΤΟΝ ΚΙΝΗΤΗΡΑ (ΚΑΤΑΝΑΛΩΣΗ ΚΑΥΣΙΜΟΥ), ΚΑΙ ΤΗΝ ΕΠΙΔΡΑΣΗ ΣΤΟ ΟΧΗΜΑ (ΟΔΗΓΗΣΙΜΟΤΗΤΑ). ΜΕ ΧΡΗΣΗ ΤΟΥ ΜΟΝΤΕΛΟΥ ΚΑΙ ΠΑΡΑΛΛΗΛΗ ΔΙΕΞΑΓΩΓΗ ΕΚΤΕΤΑΜΕΝΩΝ ΣΕΙΡΩΝ ΜΕΤΡΗΣΕΩΝ ΣΕ ΕΡΓΑΣΤΗΡΙΑΚΕΣ ΚΑΙ ΠΡΑΓΜΑΤΙΚΕΣ ΣΥΝΘΗΚΕΣ ΚΙΝΗΣΗΣ ΤΟΥ ΟΧΗΜΑΤΟΣ, ΒΕΛΤΙΣΤΟΠΟΙΗΘΗΚΕ ΤΟ ΣΥΣΤΗΜΑ ΚΕΡΑΜΙΚΗΣ ΠΑΓΙΔΑΣ ΑΙΘΑΛΗΣ ΠΟΥ ΑΝΑΠΤΥΧΘΗΚΕ ΣΤΟ ΕΡΓΑΣΤΗΡΙΟ ΕΦΑΡΜΟΣΜΕΝΗΣ ΘΕΡΜΟΔΥΝΑΜΙΚΗΣ ΤΟΥ ΑΡΙΣΤΟΤΕΛΕΙΟΥ ΠΑΝΕΠΙΣΤΗΜΙΟΥ ΘΕΣΣΑΛΟΝΙΚΗΣ ΕΤΣΙ ΩΣΤΕ:- ΝΑ ΠΑΡΟΥΣΙΑΖΕΙ ΜΕΓΑΛΟ ΒΑΘΜΟ ΑΠΟΔΟΣΗΣ ΩΣ ΠΡΟΣ ΤΗ ΣΥΓΚΡΑΤΗΣΗ ΤΗΣ ΑΙΘΑΛΗΣ. -ΝΑ ΕΧΕΙ ΤΗ ΔΥΝΑΤΟΤΗΤΑ ΑΝΑΓΕΝΝΗΣΗΣ ΚΑΤΩ ΑΠΟ ΟΠΟΙΕΣΔΗΠΟΤΕ ΣΥΝΘΗΚΕΣ ΚΙΝΗΣΗΣ. -ΝΑ ΕΜΦΑΝΙΖΕΙ ΧΑΜΗΛΗ ΑΝΤΙΘΛΙΨΗ ΣΤΗΝ ΕΞΑΓΩΓΗ ΤΟΥ ΚΙΝΗΤΗΡΑ. -ΝΑ ΕΧΕΙ ΜΙΚΡΗ ΕΠΙΔΡΑΣΗ ΣΤΗ ΚΑΤΑΝΑΛΩΣΗ ΚΑΥΣΙΜΟΥ ΚΑΙ ΣΤΗΝ ΟΔΙΚΗ ΣΥΜΠΕΡΙΦΟΡΑ ΤΟΥ ΟΧΗΜΑΤΟΣ. -ΝΑ ΕΙΝΑΙ ΠΛΗΡΩΣ ΑΥΤΟΜΑΤΟΠΟΙΗΜΕΝΟ ΩΣΤΕ ΝΑ ΜΗΝ ΑΠΑΙΤΕΙΤΑΙ ΚΑΜΙΑ ΕΠΕΜΒΑΣΗ ΑΠΟ ΤΟΝ ΟΔΗΓΟ ΤΟΥ ΟΧΗΜΑΤΟΣ.
Subjects/Keywords: DIESEL ENGINE EXHAUST GAS; EXHAUST GAS THROTTLING OF DIESEL ENGINE; EXPERIMENTAL SIMULATION OF VEHICLE MOTION; OPERATION PREDICTION OF PARTICULATE TRAP; PARTICULATE TRAP; ΕΡΓΑΣΤΗΡΙΑΚΗ ΠΡΟΣΟΜΟΙΩΣΗ ΚΙΝΗΣΗΣ ΟΧΗΜΑΤΟΣ; ΚΑΥΣΑΕΡΙΟ ΚΙΝΗΤΗΡΩΝ DIESEL; Παγίδα αιθάλης; ΠΡΟΒΛΕΨΗ ΛΕΙΤΟΥΡΓΙΑΣ ΠΑΓΙΔΑΣ ΑΙΘΑΛΗΣ; ΣΤΡΑΓΓΑΛΙΣΜΟΣ ΤΗΣ ΕΞΑΓΩΓΗΣ ΚΙΝΗΤΗΡΑ DIESEL; ΣΩΜΑΤΙΔΙΑΚΕΣ ΕΚΠΟΜΠΕΣ ΚΙΝΗΤΗΡΩΝ DIESEL
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APA (6th Edition):
ΠΑΤΣΑΤΖΗΣ, . (1990). ΠΕΙΡΑΜΑΤΙΚΗ ΚΑΙ ΘΕΩΡΗΤΙΚΗ ΑΝΑΛΥΣΗ ΚΑΙ ΠΡΟΓΝΩΣΗ ΛΕΙΤΟΥΡΓΙΩΝ ΠΑΓΙΔΑΣ ΑΙΘΑΛΗΣ ΟΧΗΜΑΤΩΝ. (Thesis). Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); Aristotle University Of Thessaloniki (AUTH). Retrieved from http://hdl.handle.net/10442/hedi/1486
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
ΠΑΤΣΑΤΖΗΣ, ΝΙΚΟΛΑΟΣ. “ΠΕΙΡΑΜΑΤΙΚΗ ΚΑΙ ΘΕΩΡΗΤΙΚΗ ΑΝΑΛΥΣΗ ΚΑΙ ΠΡΟΓΝΩΣΗ ΛΕΙΤΟΥΡΓΙΩΝ ΠΑΓΙΔΑΣ ΑΙΘΑΛΗΣ ΟΧΗΜΑΤΩΝ.” 1990. Thesis, Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); Aristotle University Of Thessaloniki (AUTH). Accessed January 17, 2021.
http://hdl.handle.net/10442/hedi/1486.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
ΠΑΤΣΑΤΖΗΣ, ΝΙΚΟΛΑΟΣ. “ΠΕΙΡΑΜΑΤΙΚΗ ΚΑΙ ΘΕΩΡΗΤΙΚΗ ΑΝΑΛΥΣΗ ΚΑΙ ΠΡΟΓΝΩΣΗ ΛΕΙΤΟΥΡΓΙΩΝ ΠΑΓΙΔΑΣ ΑΙΘΑΛΗΣ ΟΧΗΜΑΤΩΝ.” 1990. Web. 17 Jan 2021.
Vancouver:
ΠΑΤΣΑΤΖΗΣ . ΠΕΙΡΑΜΑΤΙΚΗ ΚΑΙ ΘΕΩΡΗΤΙΚΗ ΑΝΑΛΥΣΗ ΚΑΙ ΠΡΟΓΝΩΣΗ ΛΕΙΤΟΥΡΓΙΩΝ ΠΑΓΙΔΑΣ ΑΙΘΑΛΗΣ ΟΧΗΜΑΤΩΝ. [Internet] [Thesis]. Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); Aristotle University Of Thessaloniki (AUTH); 1990. [cited 2021 Jan 17].
Available from: http://hdl.handle.net/10442/hedi/1486.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
ΠΑΤΣΑΤΖΗΣ . ΠΕΙΡΑΜΑΤΙΚΗ ΚΑΙ ΘΕΩΡΗΤΙΚΗ ΑΝΑΛΥΣΗ ΚΑΙ ΠΡΟΓΝΩΣΗ ΛΕΙΤΟΥΡΓΙΩΝ ΠΑΓΙΔΑΣ ΑΙΘΑΛΗΣ ΟΧΗΜΑΤΩΝ. [Thesis]. Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); Aristotle University Of Thessaloniki (AUTH); 1990. Available from: http://hdl.handle.net/10442/hedi/1486
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
. 
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