Browsing by Subject "Efficiency"
Now showing items 1-20 of 24
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CFD Analysis of Effect of Viscosity and RPM on an Electrical Submersible Pump
(2017-05-03)Computational fluid dynamics analysis (CFD) has been employed to study the flow behavior, and dependency of pump efficiency and head on the operating conditions of the pump and fluids pumped. Commercially available ANSYS ... -
Determination of Energy Efficiency of Beef Cows under Grazing Conditions Using a Mechanistic Model and the Evaluation of a Slow-Release Urea Product for Finishing Beef Cattle
(2012-02-14)The cow/calf phase of production represents a large expense in the production of beef, and efficient beef cows use fewer resources to obtain the same outcome in a sustainable environment. The objective of study 1 was to ... -
Development of an Ultra-High Efficiency Gas Turbine Engine (UHEGT) with Stator Internal Combustion: Design, Off-Design, and Nonlinear Dynamic Operation
(2018-08-22)An Ultra-High Efficiency Gas Turbine (UHEGT) technology is developed in this study. In UHEGT, the combustion process is no longer contained in isolation between the compressor and turbine, rather distributed in multiple ... -
The Effects of the Political-Legal Environment and Corporate Characteristics on Mergers and Acquisitions in India, 1991-2005
(2012-07-16)Emerging markets such as India have witnessed waves of domestic and cross-border mergers and acquisitions. This historical analysis, which consists of two parts, tests central tenets of resource dependence theory. The ... -
The efficiency of the U.S. cotton futures market (1986-2006): normal backwardation, co-integration, and asset pricing
(2009-06-02)The efficiency of commodity futures markets is a widely debated topic in academia. The cotton futures market is no exception. The existence of trends in the futures market is characterized as a price bias, which is a ... -
Efficient Estimation in a Regression Model with Missing Responses
(2012-10-19)This article examines methods to efficiently estimate the mean response in a linear model with an unknown error distribution under the assumption that the responses are missing at random. We show how the asymptotic variance ... -
Efficient Estimators for Expectations in Nonlinear Parametric Regression Models with Responses Missing at Random & Data Integration in High Dimension with Multiple Quantiles
(2019-05-23)This dissertation contains the two research projects in my Ph.D. study. The first project considers nonlinear regression models that are solely defined by a parametric model for the regression function. The responses are ... -
Efficient Nonparametric and Semiparametric Regression Methods with application in Case-Control Studies
(2015-08-11)Regression Analysis is one of the most important tools of statistics which is widely used in other scientific fields for projection and modeling of association between two variables. Nowadays with modern computing techniques ... -
Efficient Seismic Depth Imaging and Full-Waveform Inversion via Generalized Multiscale Finite Element
(2019-01-04)Reverse-time migration (RTM) and full-waveform inversion (FWI) are widely used because they are able to recover complex geological structures. However, these wave-equation based imaging techniques also have a drawback, as ... -
Efficient Semiparametric Estimators for Nonlinear Regressions and Models under Sample Selection Bias
(2012-10-19)We study the consistency, robustness and efficiency of parameter estimation in different but related models via semiparametric approach. First, we revisit the second- order least squares estimator proposed in Wang and ... -
Essays on Efficiency Analysis
(2010-07-14)This dissertation consists of four essays which investigate efficiency analysis, especially when non-discretionary inputs exist. A new approach of the multi-stage Data Envelopment Analysis (DEA) for non-discretionary inputs, ... -
Essays on Efficiency of the Farm Credit System and Dynamic Correlations in Fossil Fuel Markets
(2012-11-28)Markets have always changed in response to either exogenous or endogenous shocks. Many large events have occurred in financial and energy markets the last ten years. This dissertation examines market behavior and volatility ... -
Evaluation and Analysis of an Integrated PEM Fuel Cell with Absorption Cooling and Water Heating System for Sustainable Building Operation
(Energy Systems Laboratory (http://esl.tamu.edu)Texas A&M University (http://www.tamu.edu), 2010)In this paper, a parametric study of a PEM fuel cell integrated with a double effect absorption system is carried out in order to study the effect of different operating conditions on the efficiency of the PEM fuel cell, ... -
Extending the Petrel Model Builder for Educational and Research Purposes
(2013-04-11)Reservoir Simulation is a very powerful tool used in the Oil and Gas industry to perform and provide various functions including but not limited to predicting reservoir performance, conduct sensitivity analysis to quantify ... -
The Impact of Residential Air Conditioner Charging and Sizing on Peak Electrical Demand
(Energy Systems Laboratory (http://esl.eslwin.tamu.edu), 1992-05)Electric utilities have had a number of air conditioner rebate and maintenance programs for many years. The purpose of these programs was to improve the efficiency of the stock of air conditioning equipment and provide ... -
Investigation of a Novel Solar Assisted Water Heating System with Enhanced Energy Yield for Buildings
(Energy Systems Laboratory (http://esl.tamu.edu)Texas A&M University (http://www.tamu.edu), 2012)This paper presented the concept, prototype application, operational performance and benefits relating to a novel solar assisted water heating system for building services. It was undertaken through dedicated theoretical ... -
Low Power High Efficiency Integrated Class-D Amplifier Circuits for Mobile Devices
(2015-01-12)The consumer’s demand for state-of-the-art multimedia devices such as smart phones and tablet computers has forced manufacturers to provide more system features to compete for a larger portion of the market share. The added ... -
Massively-Parallel Direct Numerical Simulation of Gas Turbine Endwall Film-Cooling Conjugate Heat Transfer
(2011-02-22)Improvements to gas turbine efficiency depend closely on cooling technologies, as efficiency increases with turbine inlet temperature. To aid in this process, simulations that consider real engine conditions need to be ... -
Modeling the effects of refrigerant charging on air conditioner performance characteristics for three expansion devices
(Texas A&M University. Libraries, 1990)An experimental and analytical study concerned with the off-design refrigerant charging of air conditioners is presented. A series of experiments were conducted to characterize the effects of refrigerant charge and type ... -
NABERS: Lessons from 12 Years of Performance Based Ratings in Australia
(Energy Systems Laboratory (http://esl.tamu.edu)Texas A&M University (http://www.tamu.edu), 2012)The National Australian Built Environment Rating System (NABERS) has been operating for 12 years as a performance based rating system for the energy/greenhouse efficiency of office buildings in Australia. During this period, ...