Digital Commons Network^™

Stern Review And Its Critics: Implications For The Theory And Practice Of Benefit-Cost Analysis, The, Daniel H. Cole

Natural Resources Journal

No abstract provided.

The Effects Of Automated Essay Scoring As A High School Classroom Intervention, Kathie L Frost

UNLV Retrospective Theses & Dissertations

This quasi-experimental, mixed methods study investigated whether students writing development and proficiency, in combination with teacher-led instruction, are significantly affected by the use of an automated essay scoring (AES) system. The ninth grade standard and honors English students were divided into control and treatment groups at a large, urban high school. Student writing was examined for any changes in proficiency, measured by human- and AES-scored holistic measures. A developmental writing index was used to analyze the rate of change in pre- and post-essays. The AES system was further researched by comparing the treatment and control groups' trait score categories. Finally, …

Virginia Earth Science Collaborative: Developing Highly Qualified Earth Science Teachers, J. Cothron

Journal of Mathematics and Science: Collaborative Explorations

A collaborative of seven institutes of higher education and two non-profit organizations developed and implemented five earth science courses totaling eighteen credits that enabled secondary teachers to acquire an add-on earth science endorsement: Geology 1: Physical Geology (4), Geology II: Geology of Virginia (4), Oceanography (4), Astronomy (Space Science for Teachers) (3), and Meteorology (3). These courses were collaboratively developed and included rigorous academic content, research-based instructional strategies, and intense field experiences. The thirty-three sections offered statewide served 499 participants. Three courses were offered to strengthen the skills of earth science teachers: Teaching Eath Science Topics to Special Education Students …

Meteorology And Cimatology: On-Line Weather Studies, J. A. Mulvany, M. Bentley, E. Pyle

Journal of Mathematics and Science: Collaborative Explorations

Through the Virginia Earth Science Collaborative (VESC), a partnership of nine institutes of higher education, non-profit organizations, and eighty-three school divisions, a 3-credit, graduate-level meteorology course was offered six times between Spring 2006 and Fall 2007. The course, entitled Meteorology, was offered at three locations (Richmond, Abingdon, and Harrisonburg), and a local instructor facilitated each section. Funding for the course development, instructor stipends, and participant expenses (including travel, meals, and tuition) was provided through a competitive Mathematics and Science Partnership (MSP) grant funded through the federal No Child Left Behind legislation of 2001. The framework of the course was the …

The Mid-Western Educational Research Association's Annual Meeting, October 15–18, 2008, Savilla Banister, Mark Earley, Julia Matuga, Timothy Murnen

Mid-Western Educational Researcher

Annual Meeting Announcement

Teacher Efficacy And Career Indecision Among Pre-Service Teachers: A Model Of Direct And Indirect Effects, Mary Beth Sloane, Mary D. Hancock

Mid-Western Educational Researcher

The present study investigates, through path analytic techniques, the influence of teacher efficacy on the career indecision of pre-service teachers. The sample consists of 305 students enrolled in Teacher Education programs at two southeastern universities. Results indicate that general teacher efficacy and career self-efficacy have significant direct effects on career indecision. Career self-efficacy mediates significant indirect effects for both general and personal teacher efficacy.

Ayp Accountability Policy And Assessment Theory Conflicts, Randall S. Davies

Mid-Western Educational Researcher

A major objective of NCLB is to hold schools accountable for student achievement including closing the achievement gap and raising standards of student academic proficiency. While the majority of individuals support the underlying values of NCLB, not all agree its accountability policy is reasonable. The most problematic issue is the mandate that schools be held accountable to ensure all students perform at grade level when the methods used by states to determine grade level proficiency preclude the attainment of this standard. The unintended consequences of a policy that does not align theoretically with established educational best practice inevitably result in …

Development Of Liquid-Flooded Scroll Compressor And Expander Models, Ian Bell, Vincent Lemort, Jim Braun, Eckhard Groll

International Compressor Engineering Conference

No abstract provided.

Evolutionary Methodology For Optimization Of Image Transforms Subject To Quantization Noise, Michael Ray Peterson

Browse all Theses and Dissertations

Lossy image compression algorithms sacrifice perfect imagereconstruction in favor of decreased storage requirements. Modelossy compression schemes, such as JPEG2000, rely upon the discrete wavelet transform (DWT) to achieve high levels of compression while minimizing the loss of information for image reconstruction. Some compression applications require higher levels of compression than those achieved through application of the DWT and entropy coding. In such lossy systems, quantization provides high compression rates at the cost of increased distortion. Unfortunately, as the amount of quantization increases, the performance of the DWT for accurate image reconstruction deteriorates. Previous research demonstrates that a genetic algorithm can …

Estimation Of Evapotranspiration Of Cottonwood Trees In The Cibola National Wildlife Refuge, Cibola, Arizona, Amity J. Jetton

Browse all Theses and Dissertations

This study used sap flow measurements and satellite imagery to estimatewater use by cottonwood (Populus fremontii S. Wats. ssp) trees in an irrigated restoration plot at Cibola National Wildlife Refuge on the Lower Colorado River. Several thousand hectares of irrigated plots of this type are planned to improve riparian habitat on the river, hence it is important to know how much water the trees require. In this study, the ET rates for 20 Freemont cottonwood trees, from an 8 ha plot, were monitored over a 30-day period. ET rates were estimated by measuring sap flow through branches of the trees. …

1-Alkyl-3-Methylimidazolium Bis(Pentafluoroethylsulfonyl)Imide Based Ionic Liquids: A Study Of Their Physical And Electrochemical Properties, Jennifer N. Decerbo

Browse all Theses and Dissertations

Ionic liquids are an attractive possibility for battery electrolytes. Five ionic liquids were synthesized using a 1-alkyl-3-methylimidazolium (XMI+) cation, where the alkyl group was ethyl, propyl, butyl, pentyl, or hexyl, and a bis(pentafluoroethyl-sulfonyl)imide (Beti-) anion. The absorption and desorption of water, conductivities, densities, viscosities, decomposition temperatures, and electrochemical properties were studied. These ionic liquids were found to absorb less water than previously studied ionic liquids with tetrafluoroborate (BF4-) and hexafluorophosphate (PF6-) anions. Their conductivities decreased with longer alkyl chains on the imidazolium cation and were lower than ionic liquids with BF4- as the anion. The densities of the ionic liquids …

Costas Pll Loop System For Bpsk Detection, Rajesh Kumar Keregudadhahalli

Browse all Theses and Dissertations

A 2GHz carrier recovery Costas Loop based BPSK detector is designed using CMOS 0.18μm technology. The designed BPSK detector consists of single to differential conversion circuit, phase/frequency detector, Voltage Controlled Oscillator, differential to single conversion circuit, first order loop filter and a third multiplier. Different architectures available for each block have been discussed along with the design methodology adopted. The schematics were simulated in analog design environment.

The Costas loop presented in this work can sense both 0° and 180° phases at its input. Thus the Costas loop carrier recovery circuit overcomes the 180° phase ambiguity presented by the conventional …

Ici Reduction Methods For Mc-Cdma Systems, Meng Wu

Browse all Theses and Dissertations

Multi-carrier code-division multiple-access (MC-CDMA) is an important multiple access candidate for 4G wireless communication system. While MC-CDMA provides high performance and high capacity in frequency selective fading channels, it is very sensitive to the signal distortion, especially the Inter Carrier Interference (ICI). We apply self-cancelation and a frequency transmission paradigm to MC-CDMA system to improve the sytem performance in an ICI rich environment. Furthermore, we combine the frequency transmission paradigm FD-MC-CDMA with ICI cancelation. Also, we apply all these three schemes into non-contiguous OFDM and non-contiguous MC-CDMA systems in simple Cognitive Radio communication environments and present the simulation results. Theoretical …

Automotive Battery State-Of-Health Monitoring Methods, Ryan J. Grube

Browse all Theses and Dissertations

Effective vehicular power management requires accurate knowledge of battery state, including state-of-charge (SOC) and state-of-health (SOH). An essential functionality of automotive batteries is delivering high power in short periods to crank the engine. A well-known approach to battery SOH monitoring is to infer battery state-of-health from battery impedance or resistance, which is not robust to variation of battery types. The research and development of more reliable battery state-of-health monitoring methods to ensure vehicle start-up ability are presented in this thesis. The methods include a battery cranking voltage based method, a parity-relation based method using battery voltage and cranking current signals, …

Analysis And Interpretation Of 2d Seismic Data Over The Ancona Gas Storage Facility, Illinois, Using Petrel Visualization Software, Nilanjan Roy

Browse all Theses and Dissertations

Intriguing features of the North American mid-continent are the widespread and prominent subhorizontal seismic reflectors that are thought to be associated with thick sequences of layered rocks beneath the Phanerozoic cover of the Illinois Basin. The present investigation was an effort to identify and interpret new structural features of the pre-Paleozoic crust at the Ancona Gas Storage field in north-central Illinois. A grid of existing seismic data was reprocessed using the technique of extended correlation.

The reprocessed data was then analyzed using Schlumberger's Petrel visualization software for seismic interpretation and reconstruction of the 2D and 3D crustal geometry. The reprocessing …

Glacial Deposits, Vol. 36, 2007-2008, Department Of Geography-Geology

Glacial Deposits

Newsletter of the Department of Geography-Geology

Cfd Simulations Of A Supersonic Ejector For Use In Refrigeration Applications, David Scott, Zine Aidoun, Omar Bellache, Mohamed Ouzzane

International Refrigeration and Air Conditioning Conference

No abstract provided.

Analysis Of Oil Pumping In A Reciprocating Compressor, Antonio J. Luckmann, Marcus Vinicius C. Alves, Jader R. Barbosa

International Compressor Engineering Conference

No abstract provided.

The Influence Of The Discharge Port Shape On Screw Compressor Performance And Gas Pulsations, Elvedin Mujic, Ahmed Kovacevic, Nikola Stosic, Ian K. Smith

International Compressor Engineering Conference

No abstract provided.

Cost And Weight Optimization Of A Transport Refrigeration Compressor Crankshaft, Yenetti Srinivasa Rao, Gouthaman Murali, Udupa S. Srinivasa

International Compressor Engineering Conference

No abstract provided.

Mathematical Model Of A Water-Water Refrigerating System, Antonio Augusto Torres Maia, Luiz Machado, Ricardo Nicolau Nassar Koury

International Refrigeration and Air Conditioning Conference

No abstract provided.

Operating Characteristics Of A Photovoltaic/Thermal Integrated Heat Pump System, Guoying Xu, Xiaosong Zhang, Shiming Deng, Lei Yang

International Refrigeration and Air Conditioning Conference

No abstract provided.

Experimental Studies Of Transport Properties Of Water Vapor Through Membranes, Jingchun Min, Xiaowei Liu, Teng Hu

International Refrigeration and Air Conditioning Conference

No abstract provided.

Thermodynamic Analysis Of Co2 Supercritical Two-Stage Compression Refrigeration Cycle, Yingbai Xie, Ganglei Sun, Liyong Lun, Hang Su

International Refrigeration and Air Conditioning Conference

No abstract provided.

Entropy Generation Analysis And Optimum Tube Length Of Two-Phase Flow Evaporator Tube, Obiora Sam Ezeora

International Refrigeration and Air Conditioning Conference

No abstract provided.

Numerical Resolution Of Two-Fluid Model Equations For Condensation And Evaporation Flow In Ducts Using A Pressure Based Method, Sergio Morales, Joaquim Rigola, Carlos D. Perez-Segarra, Assensi Oliva

International Refrigeration and Air Conditioning Conference

No abstract provided.

Detailed Unsteady Simulation Of Liquid Overfeed Refrigerating Systems, Alexandre Sadurni, Carles Oliet, Joaquim Rigola, Assensi Oliva

International Refrigeration and Air Conditioning Conference

No abstract provided.

A Simulation For Predicting The Refrigerant Flow Characteristics Including Metastable Region In Non-Adiabatic Capillary Tubes, Kidong Son, Sanggoo Park, Jihwan Jeong, Lyunsu Kim

International Refrigeration and Air Conditioning Conference

No abstract provided.

A Simplified Steady-State Model For Predicting The Energy Consumption Of Household Refrigerators And Freezers, Joaquim M. Gonzalves, Christian J. L. Hermes, Claudio Melo, Fernando T. Knabben

International Refrigeration and Air Conditioning Conference

No abstract provided.

High-Order Discontinuous Galerkin Method For Boltzmann Model Equations, Alina A. Alexeenko, Cyril Galitzine, Alexander M. Alekseenko

School of Aeronautics and Astronautics Faculty Publications

High-order Runge-Kutta discontinuous Galerkin (DG) method is applied to the kinetic model equations describing rarefied gas flows. A conservative DG discretization of nonlinear collision relaxation term is formulated for Bhatnagar-Gross-Krook and ellipsoidal statistical models. The numerical solutions using RKDG method of order up to four are obtained for two flow problems: the heat transfer between parallel plates and the normal shock wave. The convergence of RKDG method is compared with the conventional secondorder finite volume method for the heat transfer problem. The normal shock wave solutions obtained using RKDG are compared with the experimental measurements of density and velocity distribution …