Digital Commons Network^™

Stress Measurement And Development Of Zirconium Diboride-Silicon Carbide Ceramics, Jeremy Lee Watts

Doctoral Dissertations

"Research presented in this dissertation focused on the production of ZrB₂-SiC composites and their characterization; in particular their mechanical properties and thermally generated residual stresses. Thermally generated stresses were measured using Raman spectroscopy as well as both neutron and x-ray diffraction. For 70 vol% ZrB₂ - 30 vol% SiC composites neutron diffraction revealed that the SiC phase was under ~880 MPa compressive stress and the ZrB₂ phase was under ~450 MPa tension at room temperature. It was also discovered that stresses began to accumulate at ~1400 ⁰C upon cooling from the processing temperature (1900 ⁰C -2000 ⁰C). Raman spectroscopy and …

Ceeme: Compensating Events Based Execution Monitoring Enforcement For Cyber-Physical Systems, Thoshitha T. Gamage

Doctoral Dissertations

"Fundamentally, inherently observable events in Cyber-Physical Systems with tight coupling between cyber and physical components can result in a confidentiality violation. By observing how the physical elements react to cyber commands, adversaries can identify critical links in the system and force the cyber control algorithm to make erroneous decisions. Thus, there is a propensity for a breach in confidentiality leading to further attacks on availability or integrity. Due to the highly integrated nature of Cyber-Physical Systems, it is also extremely difficult to map the system semantics into a security framework under existing security models. The far-reaching objective of this research …

Diesel Particulate Matter Dispersion Analysis In Underground Metal/Nonmetal Mines Using Computational Fluid Dynamics, Yi Zheng

Doctoral Dissertations

"Diesel Particulate Matter (DPM) is a natural by-product from operating diesel engines. Since diesel power is a major source of energy for mining operations today, the adverse health effects of DPM are of a great concern. To thoroughly resolve DPM problems, it is critical that DPM propagation characteristics be understood to arrive at a sensible and practical method for addressing DPM-related issues. To achieve this, a computational fluid dynamics (CFD) method is used to simulate DPM dispersion and to predict its concentration distribution. Industrial field studies were reconstructed to evaluate the possibility of different CFD models. Experiments were also carried …

Effect Of Hydrophobicity And Surface Roughness On Two-Phase Flow In Rectangular Microchannels, Gautham C. Unni

Doctoral Dissertations

"Two-phase flows in microchannels have received significant attention recently, and have become the cornerstone of numerous microfluidic devices. Microscale devices used for bioengineering applications, oil recovery, and chemical and catalytic microreactor applications involve the transport of bubbles in confined fluidic networks in channels of micrometer length scale. These types of two-phase flows result in pressure variations, leading to an overall increase in pressure drop. Among various flow parameters, pressure drop is extensively used in design of microfluidic devices. There are several parameters that affect the pressure drop across two-phase flow in microchannels. In the present study, the goal is to …

Absorbing State Transitions In Clean And Disordered Lattice Models, Man Young Lee

Doctoral Dissertations

"Nonequilibrium systems can undergo continuous phase transitions between different steady states. These transitions are characterized by collective fluctuations over large distances and long times similar to the behavior of equilibrium critical points. They also can be divided into different universality classes according to their critical behavior.

This dissertation considers two types of nonequilibrium transitions. First study concerns absorbing state transitions on a randomly diluted lattice. Second study deals with nonequilibrium models with several absorbing states. We investigate two specific nonequilibrium lattice models, i.e., the contact process and the generalized contact process by means of both theoretical and computational approaches.

In …

Strength Adjustable Preformed Particle Gels For Conformance Control, Jia Zhou

Doctoral Dissertations

"Reservoir heterogeneity and early water breakthrough (also known as fingering) represent two of the greatest challenges to recover crude oil efficiently. Gel treatments have been implemented as a cost-effective method to plug high permeability zones and thus improve sweep efficiency in reservoirs. However, when extensive cross-flows exist between formation layers, gel treatments become less efficient. Polymer was used in polymer flooding to increase the viscosity of the injected fluids and to correct the fingering problem. However, such treatment may be uneconomical since dramatic viscosity loss (80-90%) is caused by shearing degradation during the injection process near the wellbore.

This research …

Quantum Electrodynamics And Fundamental Constants, Benedikt J. Wundt

Doctoral Dissertations

"The unprecedented precision achieved both in the experimental measurements as well as in the theoretical description of atomic bound states make them an ideal study object for fundamental physics and the determination of fundamental constants. This requires a careful study of the effects from quantum electrodynamics (QED) on the interaction between the electron and the nucleus.

The two theoretical approaches for the evaluation of QED corrections are presented and discussed. Due to the presence of two energy scales from the binding potential and the radiation field, an overlapping parameter has to be used in both the approaches in order to …

Sandwich Structures With Advanced Facings, Cody H. Nguyen

Doctoral Dissertations

"The purpose of this research is to investigate potential advantages of two innovative designs of sandwich panels. The first design involves sandwich panels with a piece-wise thickness of the facings aiming at two possible outcomes: (I) improved the structural response, i.e. strength and stiffness, without increasing the weight of the structure or (2) reduction in the weight of the structure without a detriment to its structural response. The analysis is conducted analytically using the first-order shear deformation theory and numerically by the finite element analysis of conventional and stepped-wise sandwich panels. The applicability of the first-order shear deformation theory to …

Spiking Neural Networks And Their Applications, Cameron Eric Johnson

Doctoral Dissertations

"Artificial neural networks (ANNs) have been developed as adaptable, robust function approximators for at least the last quarter-century. They have progressed through two generations, and the third is now under development. Spiking neural networks (SNNs) seek to improve on previous generations in two ways: by using a more biologically-inspired neuron, they are shown to be capable of more complex calculations; incorporating polychronous properties of highly-recurrent networks with delays of different lengths on each synapse to achieve large numbers of possible patterns with relatively few neurons and synapses.

Abstracted spiking neurons have been used as a third-generation activation function in a …

Does Self-Complexity Predict Dishonest Behavior Via Cognitive Dissonance?, William H. Heath

College of Graduate Studies: Theses & Dissertations

Psychologists disagree about what, if any, benefit high self-complexity might provide. Although Linville (1987) demonstrated that high complexity buffers against stress, other studies have found that it leads to more negative outcomes in the long term (Diehl et al., 2001). Cognitive dissonance is an important factor in regulating behavior, particularly moral behavior (Aronson, Fried, & Stone, 1999), and may explain how self-complexity leads to negative life outcomes. The present study examined if high self-complexity might buffer against the tension of cognitive dissonance, thus increasing the likelihood of dishonest behavior. Participants completed a selfcomplexity measure, and then they completed a dissonance-rousing …

Using A Flow-Chart To Reduce Juror's Pre-Existing Biases In Cases Utilizing The Insanity Defense, Lauren M. Schlumper

College of Graduate Studies: Theses & Dissertations

Many people believe that the insanity defense is used to avoid responsibility for committing a crime and that it returns dangerous individuals back to the streets. Due to the fact that it is difficult to separate such pre-existing attitudes from evidence presented throughout the trial, many jurors use their attitudes to assist them when deciding a verdict and punishment. For example, Steblay, Hosch, Culhane & McWethy (2006) found that not only is it difficult for jurors to disregard information that is not relevant or presented during trial, but that pre-trial information and attitudes can actually influence their verdict. The present …

Gretsch Guitars Catalog, Gretsch Company

Gretsch Company Catalogs & Price Lists

The catalog includes descriptions of their different models and differentiates parts for the guitars.

The Behavioral Economics Of Mergers And Acquisitions, Donald C. Langevoort

Georgetown Law Faculty Publications and Other Works

The world of mergers and acquisitions seems like a setting in which rationality necessarily dominates. There are high stakes, focused and sustained attention, and expert advisers who are repeat players. In the economics and management literature, however, there has been a great deal of research on what might be called “behavioral M&A”—using insights from psychology to explain observed patterns of behavior in the acquisitions marketplace. To date, the law has largely been uninterested in the psychological dynamics of corporate acquisitions. This essay looks at recent research on such issues as the role of overconfidence, hubris, anchoring, etc. in explaining buy-side …

Top 10 Law School Home Pages Of 2010, Roger Skalbeck, Jason Eiseman

Georgetown Law Faculty Publications and Other Works

This ranking report attempts to identify the best law school home pages based exclusively on objective criteria. The goal is to assess elements that make websites easier to use for sighted as well as visually-impaired users. Most elements require no special design skills, sophisticated technology or significant expenses.

Ranking results in this report represent reasonably relevant elements. In this report, 200 ABA-accredited law school home pages are analyzed and ranked for twenty elements in three broad categories: Design Patterns & Metadata; Accessibility & Validation; and Marketing & Communications. As was the case in 2009, there is still no objective way …

Williams V. Illinois And The Confrontation Clause: Does Testimony By A Surrogate Witness Violate The Confrontation Clause?, Paul F. Rothstein, Ronald J. Coleman

Georgetown Law Faculty Publications and Other Works

This article comprises a four-part debate between Paul Rothstein, Professor of Law at Georgetown Law Center, and Ronald J. Coleman, who works in the litigation practice group at Cleary Gottlieb Steen & Hamilton LLP, on Williams v. Illinois, a Supreme Court case that involves the Confrontation Clause, which entitles a criminal defendant to confront an accusing witness in court. The issue at hand is whether said clause is infringed when a report not introduced into evidence at trial is used by an expert to testify about the results of testing that has been conducted by a non-testifying third party. …

The Case For The Repeal Amendment, Randy E. Barnett

Georgetown Law Faculty Publications and Other Works

Today, a political movement has arisen to oppose what seems to be a highly discretionary and legally unconstrained federal government. Beginning in the Bush Administration during the Panic of 2008 and accelerating during the Obama Administration, the federal government has bailed out or taken over banks, car companies, and student loans. It is now preparing to vastly expand the Internal Revenue Service to help it take charge of the practice of medicine for the first time in American history. This marked and rapid increase of power has shaken many Americans who are now looking to the United States Constitution with …

The Rise And Fall Of The Implied Warranty Of Habitability, David A. Super

Georgetown Law Faculty Publications and Other Works

Growing concern about poverty in the late 1960s produced two sweeping legal revolutions. One gave welfare recipients rights against arbitrary eligibility rules and benefit terminations. The other gave low-income tenants recourse when landlords failed to repair their homes. The 1996 welfare law exposed the welfare rights revolution's frailty. Little noticed by legal scholars, the tenants' rights revolution also has failed, and for broadly similar reasons.

Withholding rent deliberately to challenge landlords' failure to repair is unduly risky for most tenants in ill-maintained dwellings: either moving to better housing is a better option or the risk of retaliation is too great. …

Franz Kafka, Lawrence Joseph, And The Possibilities Of Jurisprudential Literature, Patrick J. Glen

Georgetown Law Faculty Publications and Other Works

The purpose of this article is twofold. First, it offers a complementary reading of Franz Kafka’s writings on the law and Lawrence Joseph’s novel Lawyerland. This reading focuses on the distinct perspectives offered by these authors. Whereas Kafka approaches the law from the perspective of the litigant or accused, Joseph’s perspective, through the eyes of his lawyers and judges, is that of the consummate insider. The importance of perspective rests with the fact that although law might constitute an objective system, its experience is inevitably subjective. The absurd malevolence of law in Kafka can thus be rationalized by the system …

Withdrawing From International Custom: Terrible Food, Small Portions, Carlos Manuel Vázquez

Georgetown Law Faculty Publications and Other Works

Curtis A. Bradley and Mitu Gulati’s Withdrawing from International Custom brings to mind the old joke recounted by Woody Allen in Annie Hall: “Two elderly women are at a Catskill mountain resort, and one of ’em says, ‘Boy, the food at this place is really terrible.’ The other one says, ‘Yeah, I know; and such small portions.’” Similarly, while Bradley and Gulati attack international law’s current prohibition of unilateral withdrawal from custom, they propose an alternative that differs only modestly from it (small portions). At the same time, the doctrinal change they propose would take customary international law in the …

Misunderstanding Congress: Statutory Interpretation, The Supermajoritarian Difficulty, And The Separation Of Powers, Victoria Nourse

Georgetown Law Faculty Publications and Other Works

Every lawyer's theory of statutory interpretation carries with it an idea of Congress, and every idea of Congress, in turn, carries with it an idea of the separation of powers. In this article, the author critiques three dominant academic theories of statutory interpretation--textualism, purposivism, and game theory--for their assumptions about Congress and the separation of powers. She argues that each academic theory fails to account for Congress's dominant institutional features: "the electoral connection," the "supermajoritarian difficulty," and the "principle of structure-induced ambiguity." This critique yields surprising conclusions, rejecting both standard liberal and conservative views on statutory interpretation.

"Plain" meaning, it …

Skilling: More Blind Monks Examining The Elephant, Julie R. O'Sullivan

Georgetown Law Faculty Publications and Other Works

Most academics and practitioners with whom the author has discussed the result in Skilling v. United States believe that it is a sensible decision. That is, the Supreme Court did the best it could to limit the reach of 18 U.S.C. § 1346, which all nine justices apparently believed—correctly—was, on its face, unconstitutionally vague. Congress responded quickly and with little consideration with the supremely under-defined § 1346. In the over twenty years since the statute's enactment, the Courts of Appeals have been unable to come up with any unified limiting principles to contain its reach. The Skilling Court, evidently reluctant …

Relaxation Imaging To Characterize Lightweight Polymer-Crosslinked Aerogels, Emmalou T. Satterfield

Masters Theses

"Silica aerogels are three-dimensional assemblies of silica nanoparticles with extremely low densities. In some instances, the internal void volume is more than 90% of the total volume. The highly porous structure of the aerogels leads to attractive properties for thermal and noise insulation, due to very low thermal conductivity and very high acoustic impedance. The strength of silica aerogels has been substantially improved by casting a thin conformal polymer coating over the entire internal porous surfaces of the nanostructure. The coating reinforces the interparticle connections without significantly compromising the internal void space. To analyze and compare the properties of several …

The Feasibility Of Using Bifidobacteria Bifidum (Atcc 700541) For The Production Of Prebiotic Oligosaccharides, Candice Marie Luehrs

Masters Theses

"Galactooligosaccharides (GOS) are prebiotics that are being used to influence intestinal microbiota towards health promoting, beneficial bacteria like bifidobacteria. Natural sources of GOS are not found in suitable levels to achieve the desired health effects so economically viable commercial production methods are important. Enzymatic conversion of lactose to GOS through transgalactosylation is a preferred method since the starting material is inexpensive and readily available. Enzymes used in batch production are purified from fungal or bacterial sources or remain in whole cells cultured for GOS production. Purified or unbound enzymes are single use whereas enzymes retained within whole cells can potentially …

Waterjet Injection Of Powdered Activated Carbon For Sediment Remediation, Chris J. Redell

Masters Theses

"In situ sediment remediation through waterjet-activated carbon amendment delivery is an innovative means to mitigate the dangers posed by hydrophobic organic compounds. Ease of use and applicability to inundated environments makes this technique valuable. This work made feasible low-pressure injections of a 15% (by dry weight) carbon/water slurry through a pulsating piston pump waterjet. The project fabricated nozzle tips and a unique injection apparatus comprising a quantitative system for the evaluation of bench scale models. Based on a series of iterative processes, injections of carbon were analyzed for depth and concentration. Injections varied in duration and they were made into …

Magnetometer-Only Attitude Determination With Application To The M-Sat Mission, Jason D. Searcy

Masters Theses

"The topic of this thesis focuses on attitude determination for small satellites. The method described uses only a magnetometer to resolve the three-axis attitude of the satellite. The primary challenge is that magnetometers only instantaneously resolve two axes of a satellite's attitude. Typically, magnetometers are used in conjunction with other sensors to resolve all three axes. However, by using a filter over an adequately long orbit arc, the magnetometer data can yield all the information necessary. The magnetic field data are filtered to obtain the magnetic field derivative vector, which are combined with the magnetic field vector to fully resolve …

Educational Robotics: Using The Lego Mindstorms Nxt Platform For Increasing High School Stem Education, Matthew Aaron Strautmann

Masters Theses

"The field of educational robotics (ER) seeks to use the building and programming of robots to engage and educate the next generation of college freshman entering science and engineering majors. To increase the rate of application to science and engineering degree programs as well as the rate of retention, students must be engaged in high school. They must acquire the knowledge and interest to pursue these career choices. This research explores the use of robotics to interest high school students in science, technology, engineering, and math (STEM) and to improve their knowledge of these subjects. The case study developed instructional …

Risk-Sensitive Preventive Maintenance Policies Using Semivariance, Venkata Manojramam Tirumalasetty

Masters Theses

"Preventive maintenance is an important tool that increases the reliability of the production system by reducing downtime due to failures. In the literature, maintenance and replacement policies for productions systems have been widely studied and modeled. Traditionally preventive maintenance has focused only on minimizing expected costs without considering variability in costs. Cost variability is also commonly known as risk. In a 2003 paper, Chen and Jin used variance of costs as a measure of risk for formulating preventive maintenance policies. The variance criterion that they used ignored the probability of costs exceeding monthly or yearly budgets provided to managers. The …

Chasing The Greased Pig Down Wall Street: A Gatekeeper’S Guide To The Psychology, Culture And Ethics Of Financial Risk-Taking, Donald C. Langevoort

Georgetown Law Faculty Publications and Other Works

The current financial crisis has once again focused attention on lawyers, corporate directors and auditors as gatekeepers, who are expected to introduce some degree of cognitive independence to the task of risk assessment and risk management in public companies, including financial services firms. This essay examines the psychological and cultural forces that may distort risk perception and risk motivation in hyper-competitive firms, beyond the standard economic incentives associated with agency costs and moral hazards, warning gatekeepers against too easily assuming that all is well when insiders display high levels of intensity, focus and devotion to hard-to-achieve goals. In fact, these …

Constitutional Hypocrisy, Girardeau A. Spann

Georgetown Law Faculty Publications and Other Works

My legal realist inclinations leave me largely agnostic about the particular provisions that happen to be included in any particular constitution. That is because both written and unwritten constitutions seem more likely to reflect than to prescribe the normative values of the cultures that adopt them. As a result, the substantive, structural, and procedural provisions of the present United States Constitution seem perfectly adequate to promote justice-at least in a culture that is genuinely committed to the cause of justice. No constitution is likely to promote justice in a culture that lacks such a commitment. Nevertheless, there is one change …

The Inauthentic Claim, Anthony J. Sebok

Articles

This Article takes a critical look at the persistence of legal doctrines that prohibit or limit property rights in litigation. The Article focuses on prohibitions on assignment and maintenance. Assignment of personal injury tort claims is prohibited throughout the United States, while the assignment of other claims, such as fraud and professional malpractice, is prohibited in a large number of states. Maintenance, in which a stranger provides something of value to a litigant in order to support or promote the litigation, is prohibited in varying degrees in the United States.

These doctrines might seem quite independent of each other at …