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Articles 17941 - 17970 of 18524
Full-Text Articles in Entire DC Network
Climate Change And The Clean Air Act, Lisa Heinzerling
Climate Change And The Clean Air Act, Lisa Heinzerling
Georgetown Law Faculty Publications and Other Works
In Massachusetts v. EPA, petitioners - twelve states, three cities, an American territory, and numerous health and environmental groups - have asked the Supreme Court to hold that the Clean Air Act gives EPA the power to regulate greenhouse gas emissions from motor vehicles and that EPA may not decline to exercise this power based on statutorily irrelevant factors. The problem petitioners ultimately seek to address - climate change - is unique in its scope and complexity. But the legal issues before the Court in Massachusetts v. EPA are neither particularly grand nor particularly complex. They are the kinds of …
Environmental Law After Katrina: Reforming Environmental Law By Reforming Environmental Lawmaking, Richard J. Lazarus
Environmental Law After Katrina: Reforming Environmental Law By Reforming Environmental Lawmaking, Richard J. Lazarus
Georgetown Law Faculty Publications and Other Works
Hurricane Katrina's overriding lesson for environmental law is no less than our environmental lawmaking institutions require fundamental reformation. Otherwise, the nation's tragic failure not only to enact laws that anticipate the obvious risks presented to the Gulf Region by hurricanes, but perversely to increase those risks by destroying the ecosystem's natural protections, will inevitably be repeated with even more devastating results.
Do Charter Schools Threaten Public Education? Emerging Evidence From Fifteen Years Of A Quasi-Market For Schooling, James Forman Jr.
Do Charter Schools Threaten Public Education? Emerging Evidence From Fifteen Years Of A Quasi-Market For Schooling, James Forman Jr.
Georgetown Law Faculty Publications and Other Works
Supporters of public education have long feared that charter schools will threaten the public system, both by 1) creaming off the most advantaged students and 2) undermining political support for the public system. These fears have not been borne out. Blacks are disproportionately in charters, whites are disproportionately in traditional public schools, and Hispanics are fairly evenly distributed between the two. Looking at class measures, poor students are distributed fairly equally between the two types of schools. And turning to other measures of privilege, the evidence does not point strongly in either direction. My conclusions are not without qualification. The …
Interface And Surface Optical Phonons Spectra In Wurtzite Nitride Quantum Well Wires: Size And Dielectric Effects, Li Zhang
Turkish Journal of Physics
By employing the method of electrostatic potential expansion, the interface optical (IO) and surface optical (SO) phonon modes and the corresponding Fröhlich-like electron-phonon-interaction Hamiltonian in a Q1D wurtzite cylindrical quantum well wire (QWW) embedded in nonpolar dielectric matrix are derived and studied based on the dielectric continuum model and Loudon's uniaxial crystal model. Numerical calculations for a wurtzite GaN/AlN QWW are mainly focused on the size- and dielectric-dependent IO and SO phonon spectra and electron-IO (SO)phonons coupling functions. Results reveal that, in general, there are two branches of IO phonon modes and one branch of SO mode in the system. …
The Extreme Ultraviolet Emission Lines Of Some Cataclysmic Variables At Outburst, Romanus N. C. Eze
The Extreme Ultraviolet Emission Lines Of Some Cataclysmic Variables At Outburst, Romanus N. C. Eze
Turkish Journal of Physics
Using spectral technique, analyses of some astrophysical data from the EUVE satellite in the Extreme Ultraviolet region on accretion disk of some cataclysmic variable were carried out. A number of strong emission lines in 14 CVs were discovered. Most CVs follow a similar trend in the number of ionized elements present in their spectrum while some have very few or no ionized elements in their spectrum. The AM Herculis star, which has the weakest magnetic field of all seven magnetic CVs studied, contain no ionized elements in its EUVE spectroscopy. However, for the rest of the CVs, there is sufficient …
Unsteady Mhd Flow Due To Eccentric Rotating Disks For Suction And Blowing, Muhammad R. Mohyuddin
Unsteady Mhd Flow Due To Eccentric Rotating Disks For Suction And Blowing, Muhammad R. Mohyuddin
Turkish Journal of Physics
An exact solution of unsteady flow of a viscous fluid due to a sudden pull with constant velocities of non-coaxial rotations between two porous infinite disks in the presence of uniform transpose magnetic field is investigated. Two different methods are used to obtain the solution at large times and the solution at small times. The effects of magnetic field suction and injection on the velocity distributions are presented.
Time Dependent Entropy Of Constant Force Motion, Özgür Özcan, Ethem Aktürk, Ramazan Sever
Time Dependent Entropy Of Constant Force Motion, Özgür Özcan, Ethem Aktürk, Ramazan Sever
Turkish Journal of Physics
Time dependent entropy of constant force motion is investigated. Obtained is the joint entropy, also known as the Leipnik entropy. The main purpose of this work is to calculate the Leipnik entropy via a time dependent wave function which is obtained by the Feynman path integral method. For this case it is found the Leipnik entropy increases with time, and is the same behavior as in the free particle case.
A Single Junction Barrier Model For Varistors, Mustapha Tioursi, Abdallah Chaouch
A Single Junction Barrier Model For Varistors, Mustapha Tioursi, Abdallah Chaouch
Turkish Journal of Physics
In this paper, we propose a simplified model that explains the experimental behaviour of the single junction barrier height in varistors. The equation obtained for the barrier height variation versus voltage contains all parameters that characterize the grain boundary and has no adjustable parameters. It allows us to describe the equilibrium state for each voltage level. From this model, it is concluded that the threshold voltage and the nonlinearity coefficient for a single junction barrier are strongly related to the unoccupied traps level at zero bias, when the barrier height at zero bias and the leakage current are related to …
Application Of Pma Towards Moderating The Charge Storage Capability Of Mis Memory Cell Based On Pecvd Deposited Silicon Nitride Thin Films, Satinder K. Sharma, B. Prasad, Dinesh Kumar
Application Of Pma Towards Moderating The Charge Storage Capability Of Mis Memory Cell Based On Pecvd Deposited Silicon Nitride Thin Films, Satinder K. Sharma, B. Prasad, Dinesh Kumar
Turkish Journal of Physics
A memory capacitor formed from Al/Si_3N_4/Si was prepared by means of trapping and de trapping mechanism of the dielectric films. Charge trapping and interface state characteristics of silicon nitride (Si_3N_4) films deposited by standard plasma enhanced chemical vapor deposition technique were investigated. High frequency capacitance-voltage (C-V), conductance-voltage (G-V) and current voltage (I-V) measurements were carried out at various temperatures on metal-oxide-semiconductor capacitors, for as-deposited samples, post metallization annealed (PMA) at 400 °C and 600 °C samples. The electrically measured characteristics indicate the shift in flat band voltage V_FB in silicon nitride (Si_3N_4) was initially much higher in the as-deposited samples. …
Assessing Product Configurator Capabilities For Successful Mass Customization, Kundana Inala
Assessing Product Configurator Capabilities For Successful Mass Customization, Kundana Inala
University of Kentucky Master's Theses
Mass customization is becoming a competitive strategy for companies offering individualized products. Product configurators provide a platform for companies to do interactive product configuration which is essential for mass customization. Companies need to realize the degree of customization appreciated by the customers and the extent of customization that can be offered competitively. This research is an effort to develop an approach to ascertain the product configurator requirements to achieve mass customization. The frameworks developed for this research are validated with a case study.
Rlinks: A Mechanism For Navigating To Related Files, Naveen Akarapu
Rlinks: A Mechanism For Navigating To Related Files, Naveen Akarapu
University of Kentucky Master's Theses
This thesis introduces Relative links or rlinks, which are directed labeled links from one file to another in a file system. Rlinks provide a clean way to build and share related-file information without creating additional files and directories. Rlinks form overlay graphs between files of a file system, thus providing useful alternate views of the file system. This thesis implements rlinks for the Linux kernel and modifies the storage structure of the Ext2 file system to store the rlinks.
Finite Element Modeling Of An Inflatable Wing, Johnathan Rowe
Finite Element Modeling Of An Inflatable Wing, Johnathan Rowe
University of Kentucky Master's Theses
Inflatable wings provide an innovative solution to unmanned aerial vehicles requiring small packed volumes, such as those used for military reconnaissance or extra-planetary exploration. There is desire to implement warping actuation forces to change the shape of the wing during flight to allow for greater control of the aircraft. In order to quickly and effectively analyze the effects of wing warping strategies on an inflatable wing, a finite element model is desired. Development of a finite element model which includes woven fabric material properties, internal pressure loading, and external wing loading is presented. Testing was performed to determine material properties …
Semi-Empirical Method For Designing Excavation Support Systems Based On Deformation Control, David G. Zapata-Medina
Semi-Empirical Method For Designing Excavation Support Systems Based On Deformation Control, David G. Zapata-Medina
University of Kentucky Master's Theses
Due to space limitations in urban areas, underground construction has become a common practice worldwide. When using deep excavations, excessive lateral movements are a major concern because they can lead to significant displacements and rotations in adjacent structures. Therefore, accurate predictions of lateral wall deflections and surface settlements are important design criteria in the analysis and design of excavation support systems. This research shows that the current design methods, based on plane strain analyses, are not accurate for designing excavation support systems and that fully three-dimensional (3D) analyses including wall installation effects are needed. A complete 3D finite element simulation …
Numerical Simulation Of Two Flow Control Approaches For Low Reynolds Number Applications, Daniel A. Reasor Jr.
Numerical Simulation Of Two Flow Control Approaches For Low Reynolds Number Applications, Daniel A. Reasor Jr.
University of Kentucky Master's Theses
Current research in experimental and computational fluid dynamics is focused in the area of flow control. Flow control devices are usually classified as either passive or active. Plasma actuators are active flow control devices that require input from an external power source. Current efforts have modeled the effects of plasma actuators as a body force near the electrode. The research presented herein focuses on modeling the fluid-plasma interaction seen in dielectric barrier discharge plasma actuators as a body force vector in the region above the embedded electrode using computational fluid dynamics (CFD). This body force is modeled as the product …
"Appalachian Ingenuity" In Action: Activists Reach Beyond Traditional Economic Development In Kentucky, Stephanie Ann Blessing
"Appalachian Ingenuity" In Action: Activists Reach Beyond Traditional Economic Development In Kentucky, Stephanie Ann Blessing
University of Kentucky Master's Theses
This Thesis is an exploration into social change strategies in Appalachia that are alternative to conventional economic development practices and discourses. Drawing from original interviews with social justice activists in central and eastern Kentucky, I document a diversity of subversive discourses circulating in Appalachia, and I delineate models alternative to development that are driving action in several different communities. Through what one of my interviewees described as Appalachian ingenuity,1 individuals are enacting extremely hopeful and imaginative projects, and they are conjuring unique formulations that contribute to academic theories on alternative economies, capitalocentrism, neoliberalism, postmodern economics, anti-development, post-development, and spatial strategies …
Semistructured Probabilistic Object Query Language (A Query Language For Semistructured Probabilistic Data), Praveen Gutti
Semistructured Probabilistic Object Query Language (A Query Language For Semistructured Probabilistic Data), Praveen Gutti
University of Kentucky Master's Theses
This work presents SPOQL, a structured query language for Semistructured Probabilistic Object (SPO) model [4]. The original query language for semistructured probabilistic database management system [20], SP-Algebra [4], has limitations such as complex functional notation and unfamiliarity to application programmers. SPOQL alleviates these problems by providing a user friendly and familiar SQL-like declarative syntax for writing queries against SPDBMS. We show that parsing SPOQL queries is a more involving task than parsing SQL queries. We describe the evaluation algorithm for SPOQL queries that we have implemented.
Influence Of Surface Roughness Of Copper Substrate On Wetting Behavior Of Molten Solder Alloys, Dinesh Reddy Nalagatla
Influence Of Surface Roughness Of Copper Substrate On Wetting Behavior Of Molten Solder Alloys, Dinesh Reddy Nalagatla
University of Kentucky Master's Theses
The objective of this study is to understand the effect of surface roughness of the Cu substrate on the wetting of molten solder alloys. Eutectic Sn-Pb, pure Sn and eutectic Sn-Cu solder alloys and Cu substrates with different surface finish viz., highly polished surface, polished surface and unpolished surface were used in this work. Highly polished surface was prepared in Metallography lab, University of Kentucky while other two substrates were obtained from a vendor. Surface roughness properties of each substrate were measured using an optical profilometer. Highly polished surface was found to be of least surface roughness, while unpolished surface …
The Process Of Using Superplastic Forming To Create Medical Components, Daniel Lee Thomas
The Process Of Using Superplastic Forming To Create Medical Components, Daniel Lee Thomas
University of Kentucky Master's Theses
In the present work superplastic forming (SPF) is used as part of a process to create medical implants out of titanium. SPF is a forming process which offers many advantages over conventional forming processes. It allows for greater complexity in shape as well as the ability to work with difficult to form metals such as titanium which is a key metal in the biomedical field. SPF has been used extensively in the aerospace and automobile industry, however in recent years it has been shown to be a viable means in creating medical implants. The current process involves manipulating CT scans …
The Use Of Selective Annealing For Superplastic Forming Of Mg Az31 Alloy, Michael Christopher Cusick
The Use Of Selective Annealing For Superplastic Forming Of Mg Az31 Alloy, Michael Christopher Cusick
University of Kentucky Master's Theses
A recent study on the Post-Formed properties of Superplastically Formed Magnesium AZ31B has shown that the heating time prior to testing has a major effect on the Post Forming properties of the superplastically material. To this point, there has been very little examination into the effect of pre-heating or annealing on superplastic forming (SPF) properties. In this work, the effects of annealing prior to the SPF of Mg AZ31 alloy were examined. Both high temperature SPF tensile and bulge specimens were formed after annealing. Multiple annealing temperatures were examined to produce specimens with grain sizes ranging from 8 andamp;igrave;m to …
An Approach To Inverse Modeling Through The Integration Of Artificial Neural Networks And Genetic Algorithms, Kirthi Bedida
An Approach To Inverse Modeling Through The Integration Of Artificial Neural Networks And Genetic Algorithms, Kirthi Bedida
University of Kentucky Master's Theses
A hybrid model integrating predictive capabilities of Artificial Neural Network (ANN) and optimization feature of Genetic Algorithm (GA) is developed for the purpose of inverse modeling. The proposed approach is applied to Superplastic forming of materials to predict the material properties which characterize the performance of a material. The study is carried out on two problems. For the first problem, ANN is trained to predict the strain rate sensitivity index m given the temperature and the strain rate. The performance of different gradient search methods used in training the ANN model is demonstrated. Similar approach is used for the second …
The Development Of An Engine Lubricant Containing Soybean Oil, Stephanie Mccoy
The Development Of An Engine Lubricant Containing Soybean Oil, Stephanie Mccoy
University of Kentucky Master's Theses
The major downfalls of vegetable oils, namely soybean oil in this research, are very detrimental to engine lubricant performance. A unique - out of the box- additive package is needed to compensate for the lubricant deficiencies. This research searched for unique additive solutions to the problems of oxidation and heat stability, low temperature pumpability, and fluid corrosiveness. The additive solutions were then tested in preliminary engine tests. In this research, several formulations were developed that passed the main engine oil low temperature test, the mini rotary viscometer. The lubricants met the passing viscosity requirements of 60,000 centipoise and exhibited no …
Effectiveness Of Multifaceted Hospitalwide Quality Improvement Programs Featuring An Intervention To Remove Unnecessary Urinary Catheters At A Tertiary Care Center In Thailand, Anucha Apisarnthanarak, Kanokporn Thongphubeth, Sirinaj Sirinvaravong, Danai Kitkangvan, Chananart Yuekyen, Boonyasit Warachan, David K. Warren, Victoria J. Fraser
Effectiveness Of Multifaceted Hospitalwide Quality Improvement Programs Featuring An Intervention To Remove Unnecessary Urinary Catheters At A Tertiary Care Center In Thailand, Anucha Apisarnthanarak, Kanokporn Thongphubeth, Sirinaj Sirinvaravong, Danai Kitkangvan, Chananart Yuekyen, Boonyasit Warachan, David K. Warren, Victoria J. Fraser
Open Access Publications
No abstract provided.
Defining Limits Of Treatment With Humanized Neutralizing Monoclonal Antibody For West Nile Virus Neurological Infection In A Hamster Model, John D. Morrey, Venkatraman Siddharthan, Aaron L. Olsen, Hong Wang, Justin G. Julander, Jeffery O. Hall, Hua Li, Jeffrey L. Nordstrom, Scott Koenig, Syd Johnson, Michael S. Diamond
Defining Limits Of Treatment With Humanized Neutralizing Monoclonal Antibody For West Nile Virus Neurological Infection In A Hamster Model, John D. Morrey, Venkatraman Siddharthan, Aaron L. Olsen, Hong Wang, Justin G. Julander, Jeffery O. Hall, Hua Li, Jeffrey L. Nordstrom, Scott Koenig, Syd Johnson, Michael S. Diamond
Open Access Publications
No abstract provided.
E2f8 Is A Nonreceptor Activator Of Heterotrimeric G Proteins, Ian S. Hagemann, Kirk D. Narzinski, Thomas J. Baranski
E2f8 Is A Nonreceptor Activator Of Heterotrimeric G Proteins, Ian S. Hagemann, Kirk D. Narzinski, Thomas J. Baranski
Open Access Publications
No abstract provided.
Calmodulin Kinase Ii Inhibition Enhances Ischemic Preconditioning By Augmenting Atp-Sensitive K+ Current, Jingdong Li, Celine Marionneau, Olha Koval, Leonid Zingman, Peter J. Mohler, Jeanne M. Nerbonne, Mark E. Anderson
Calmodulin Kinase Ii Inhibition Enhances Ischemic Preconditioning By Augmenting Atp-Sensitive K+ Current, Jingdong Li, Celine Marionneau, Olha Koval, Leonid Zingman, Peter J. Mohler, Jeanne M. Nerbonne, Mark E. Anderson
Open Access Publications
No abstract provided.
The Pathogenic Fungus Cryptococcus Neoformans Expresses Two Functional Gdp-Mannose Transporters With Distinct Expression Patterns And Roles In Capsule Synthesis, Tricia R. Cottrell, Cara L. Griffith, Hong Liu, Ashley A. Nenninger, Tamara L. Doering
The Pathogenic Fungus Cryptococcus Neoformans Expresses Two Functional Gdp-Mannose Transporters With Distinct Expression Patterns And Roles In Capsule Synthesis, Tricia R. Cottrell, Cara L. Griffith, Hong Liu, Ashley A. Nenninger, Tamara L. Doering
Open Access Publications
No abstract provided.
Organogenesis Of Kidney And Endocrine Pancreas: The Window Opens, Marc R. Hammerman
Organogenesis Of Kidney And Endocrine Pancreas: The Window Opens, Marc R. Hammerman
Open Access Publications
No abstract provided.