Digital Commons Network^™

Prediction And Performance Of Single Piles In Clay Soils Under Vibratory Loadings, Domenica Cambio

Doctoral Dissertations

"This study developed a model for predicting the response, in terms of amplitude versus frequency of single piles under lateral vibratory loadings embedded in clay or fine silty soils. The model incorporates frequency dependent parameters and the effects of soil non-linearity through the relationship between soil shear modulus and damping with strain. A computer program, Dyna5, was used to generate the computed response of single piles using the Novak and El-Shamouby (1983) approach. Soil non-linearity was accounted for by incorporating spline interpolation routine into Dyna5. Sliding and coupled rocking vibrations were addressed. The computed responses were predicted and compared with …

Nano-Particles Induced Oxidative Stress In Immortalized Human Brain Endothelial Cells, Xinsheng Zhang

Doctoral Dissertations

"Nanoparticles are engineered structure with at least one dimension of 100 nanometers or less. These materials are increasingly being used for commercial purposes such as catalyst, semiconductor, cosmetics, microelectronic, and drug carrier. However, the toxicological impact of these materials has not yet been studied in detail, thereby limiting their use. In our present study, we use human brain endothelial cell line as a blood-brain barrier (BBB) model to investigate if two kinds of nanoparticles [ 1). Diesel exhaust particles (DEPs) and 2). single wall carbon nanotube (CNT) ] induced oxidative stress in cell model. Our studies showed that DEPs or …

Characterization Of Wave Transport In Non-Conservative Media With Random And Correlated Disorder, Benjamin Henry Payne

Doctoral Dissertations

"Passive quasi-one-dimensional random media exhibit one of the three regimes of transport - ballistic, diffusive, or Anderson localization - depending on system size. The ballistic and diffusion approximations assumes particle transport, whereas Anderson Localization occurs when wave self-interference effects are dominant. When the system contains absorption or gain, then how the regimes can be characterized becomes unclear. By investigating theoretically and numerically the ratio of transmission to energy in a random medium in one dimension, we show this parameter can be used to characterize localization in random media with gain. Non-conservative media implies a second dimension for the transport parameter …

Synthesis And Applications Of Imidazolium-Based Ionic Liquids And Their Polymer Derivatives, Woon Su Oh

Doctoral Dissertations

"Imidazolium-based ionic liquids have been increasingly used as green solvents to replace the volatile and relatively toxic organic solvents, in homogeneous and heterogeneous catalysis, materials science, nano materials, lithium ion batteries, and separation technology. Section 1 describes the modulating effect of the imidazolium based room temperature ionic liquids (RTILs) on the critical micelle concentrations (CMC) of surfactants. CMC of sodium dodecyl sulfate (SDS), an anionic surfactant, has been investigated in aqueous solutions of a variety of room temperature ionic liquids (RTILs). CMC values decrease with increasing alkyl chain-length and with fluorinated side chains on the imidazole moiety. In section 2, …

Updated Eor Screening Criteria And Modeling The Impacts Of Water Salinity Changes On Oil Recovery, Ahmad Aladasani

Doctoral Dissertations

"Developing technologies for enhanced oil recovery (EOR) from existing oil fields would supply the world's energy needs for several decades. The application of EOR in many major oil-producing countries remains in its conceptual stage. Thermal and gas EOR methods achieve high incremental rates; however, their application range has not broadened significantly as they have matured, while the rate at which new, promising EOR methods such as Low-salinity water flooding (LSWF) are being implemented is alarming. Despite, the potential of LSWF its development and application has been hindered by the lack of consensus concerning its recovery mechanism(s). Every oil reservoir has …

Electrodeposition And Electrochemical Reduction Of Epitaxial Metal Oxide Thin Films And Superlattices, Zhen He

Doctoral Dissertations

"The focus of this dissertation is the electrodeposition and electrochemical reduction of epitaxial metal oxide thin films and superlattices. The electrochemical reduction of metal oxides to metals has been studied for decades as an alternative to pyrometallurgical processes for the metallurgy industry. However, the previous work was conducted on bulk polycrystalline metal oxides. Paper I in this dissertation shows that epitaxial face-centered cubic magnetite (Fe₃O₄) thin films can be electrochemically reduced to epitaxial body-centered cubic iron (Fe) thin films in aqueous solution on single-crystalline Au substrates at room temperature. This technique opens new possibilities to produce special epitaxial metal/metal oxide …

Measuring The Orientations Of Hidden Subvertical Joints In Highways Rock Cuts Using Ground Penetrating Radar In Combination With Lidar, Adnan Mohammed Aqeel

Doctoral Dissertations

"Mapping discontinuities in rock cuts and measuring their orientations is crucial in assessing the stability of rock masses. This can be done usually using manual methods such as scanline or advanced techniques such as LIDAR. However, these methods are used only to map exposed discontinuities which may cause underestimation for slope stability. Accordingly, ground penetrating radar (GPR) has been recently used to detect such hidden discontinuities.

The used 400 MHz monostatic GPR antenna was significantly able to detect and map hidden subvertical joints within 4 m depths in five sandstone highways rock cuts and within 3 m depths in two …

An Improved Dipole-Moment Model Based On Near-Field Scanning For Characterizing Near-Field Coupling And Far-Field Radiation From An Ic, Zhenwei Yu

Doctoral Dissertations

"Radio Frequency Interference (RFI) problems are critical issues in wireless platform design. The accurate noise model of integrated circuits (ICs) is needed to help designers to diagnose and predict RFI problems. In this dissertation, an improved IC radiated emission model based on near-field measurements is proposed. The regularization technique and the truncated SVD method are employed together with the least square method to calculate the dipole moments from the near-field data. This dipole model has clear physical meaning: the electric and magnetic dipoles represent the voltage and the current in the circuit, respectively. One application of this dipole model is …

Compressive Sensing For 3d Microwave Imaging Systems, Hamed Kajbaf

Doctoral Dissertations

"Compressed sensing (CS) image reconstruction techniques are developed and experimentally implemented for wideband microwave synthetic aperture radar (SAR) imaging systems with applications to nondestructive testing and evaluation. These techniques significantly reduce the number of spatial measurement points and, consequently, the acquisition time by sampling at a level lower than the Nyquist-Shannon rate. Benefiting from a reduced number of samples, this work successfully implemented two scanning procedures: the nonuniform raster and the optimum path.

Three CS reconstruction approaches are also proposed for the wideband microwave SAR-based imaging systems. The first approach reconstructs a full-set of raw data from undersampled measurements via …

Densification And Thermal Properties Of Zirconium Diboride Based Ceramics, Matthew Joseph Thompson

Doctoral Dissertations

"The research presented in this dissertation focuses on the processing and thermomechanical properties of ZrB₂ based ceramics. The overall goal was to improve the understanding of thermal and mechanical properties based on processing conditions and additives to ZrB₂. To achieve this, the relationships between the thermal and mechanical properties were analyzed for ZrB₂ ceramics that were densified by different methods, varying amounts of carbon, B₄C, or TiB₂ additions. Four main areas were investigated in this dissertation. The first showed that decreased processing times, regardless of densification method, improved mechanical strength to >500 MPa. This study also revealed that lower oxygen …

Free-Radical Maleation Of Poly(Butylene Adipate-Co-Terephthalate) In Supercritical Carbon Dioxide And Its Effect On The Percolation And Deformation Mechanism Of Layered Silicate Nanocomposites, Alexandria Niemoeller

Doctoral Dissertations

The utilization of compostable polymers such as poly(butylene adipate-co-terephthalate) (PBAT) in single-use packaging applications can mitigate the water, solvents, and energy required for processing plastic waste. PBAT exhibits exceptional elongational properties, but its moderate water vapor permeability and low tensile modulus limit the applications in which PBAT can be employed. In this work, PBAT nanocomposites were produced at various loadings of organically-modified montmorillonite. The secondary structure of nanoparticles formed within the PBAT matrix was evident in the terminal region of the linear viscoelastic response under oscillatory shear, and a percolation threshold was determined to occur at 3.88% clay by weight. …

Meso-Scale Fluidic Devices With Chemical Sensors For Biological Applications, Satya Gowthami Achanta

Doctoral Dissertations

"Molecular oxygen and humidity are some of the major environmental quantities being measured for various industrial and commercial applications. This dissertation focuses on the design, fabrication and characterization of optofluidic biosensor systems for oxygen and humidity quantification using color charge-coupled device (CCD) camera as a photodetector and LED panel as an excitation source. Meso-scale fluidic devices with integrated oxygen and humidity sensors for potential applications to hydrotropic and oxytropic studies of small plant roots have been investigated in this study. Meso-scale sensor platform was fabricated using porphyrine complex as the sensitive dye embedded within Ethyl Cellulose (EC) polymer matrix. Green …

Stochastic Optimal Adaptive Controller And Communication Protocol Design For Networked Control Systems, Hao Xu

Doctoral Dissertations

"Networked Control System (NCS) is a recent topic of research wherein the feedback control loops are closed through a real-time communication network. Many design challenges surface in such systems due to network imperfections such as random delays, packet losses, quantization effects and so on. Since existing control techniques are unsuitable for such systems, in this dissertation, a suite of novel stochastic optimal adaptive design methodologies is undertaken for both linear and nonlinear NCS in presence of uncertain system dynamics and unknown network imperfections such as network-induced delays and packet losses. The design is introduced in five papers.

In Paper 1, …

Hollow Hydroxyapatite Microspheres As Devices For Controlled Delivery Of Proteins And As Scaffolds For Tissue Engineering, Hailuo Fu

Doctoral Dissertations

"Hollow HA microspheres were prepared by converting Li₂O-CaO-B₂O₃ glass microspheres in a K₂HPO₄ solution. Process parameters, such as reaction temperature (25°C-60°C) and concentration of the phosphate solution (0.02-0.25 M) significantly influenced the microstructure of the hollow HA microspheres. Microspheres with the largest hollow core size were obtained at lower temperature or with low K₂HPO₄ concentration. In comparison, microspheres with high surface area (~140 m²/g) were obtained at higher K₂HPO₄ concentration (0.25 M). Upon heat treatment (up to 900°C), the surface area of the hollow HA microspheres decreased (from ~100 m²/g to ~2 m²/g), and the rupture strength increased (from ~11 …

Therapeutic Effects Of N-Acetylcysteine Amide In The Treatment Of Eye Disorders, Joshua W. Carey

Doctoral Dissertations

"The loss of vision from age-related eye diseases now affects over 30 million people in the United States and is expected to reach twice that number within the next couple of decades. Among these disorders, age-related macular degeneration and cataract formation represent the largest percentage of these cases. Therapeutic options available for treating age-related macular degeneration are limited and there is no noninvasive form of treatment for cataracts current available. Several studies have indicated that oxidative stress plays an important role in the pathology of these age-related eye disorders. If oxidative stress is responsible for the initiation and progression of …

2012 Fall Commencement, Georgia Southern University

Commencement Programs

No abstract provided.

Response: The Death Of The Bisexual Saboteur, Naomi Mezey

Georgetown Law Faculty Publications and Other Works

Professor Glazer offers us, in Sexual Reorientation, an appealing and intuitive way to deal with the difficulty of bisexual identity, an identity that has always fit uneasily and sometimes quite unhappily in the LGBT rights movement. If the principal problem of bisexuality is its very temporal changeability, its tendency to dissolve into heterosexuality or homosexuality depending on the gender of one's sexual partner, then Glazer's solution is elegant. She proposes that we bifurcate (so to speak) sexual orientation into two subcategories and acknowledge for everyone both a general and a specific orientation. General orientation "is the sex toward which …

Juvenile Justice After Graham V. Florida: Keeping Due Process, Autonomy, And Paternalism In Balance, Kristin N. Henning

Georgetown Law Faculty Publications and Other Works

Legal disputes involving children invariably evoke a complex matrix of issues such as child and adolescent capacity, individual rights and autonomy, parental authority, and in the criminal justice context-diminished culpability for a minor's actions. While it is difficult to identify a clear and cohesive jurisprudence regarding the balance between children's autonomy and children's vulnerability across Supreme Court cases, a series of cases over the last decade, including Roper v. Simmons, Graham v. Florida, and J.D.B. v. North Carolina, offer a more consistent view of children as vulnerable, malleable, and in need of protection, at least in the …

Lessons From Social Psychology For Complex Operations, Rosa Brooks

Georgetown Law Faculty Publications and Other Works

This short essay looks at several social forces that powerfully affect human behavior, often trumping individual “character,” personality, knowledge, and even deeply held moral beliefs. Specifically, this essay looks briefly at issues of obedience, conformity, and group polarization, discussing the ways in which they can affect and distort individual behavior. Ultimately, this essay suggests, understanding these dynamics can have important implications for how we think about counterinsurgency and stability operations.

National Security In The Information Age, Rosa Brooks

Georgetown Law Faculty Publications and Other Works

The information environment has been changing right along with the broader security environment. Today, the information environment connects almost everyone, almost everywhere, almost instantaneously. The media environment has become global, and there’s no longer such thing as “the news cycle” —everything is 24/7. Barriers between US and global publics have virtual disappeared: Everything and anything can “go viral” instantly, and it’s no longer possible to say one thing to a US audience and another thing to a foreign audience and assume no one will ever set the statements side by side. The Pakistani military has a very clear idea of …

Assessing The Impeachment Of President Bill Clinton From A Post 9/11 Perspective, Susan Low Bloch

Georgetown Law Faculty Publications and Other Works

The impeachment of President Clinton was more a circus than a serious effort to remove the President of the United States. The reason is simple: Few people--in the Congress or the country--wanted to remove him or believed the impeachment effort would actually result in his removal. Instead, it was a partisan political effort to embarrass Clinton and "send a message" of disapproval. Congress was attaching a "scarlet letter." But this was an indulgence that posed considerable danger that few in Congress considered. In particular, few tried to assess the potential impact this use of the process would have on the …

Microstructure And Mechanical Properties Of Silicon Carbide-Titanium Diboride Ceramic Composites, Derek Scott King

Masters Theses

"The microstructure, hardness, fracture toughness, Young's modulus, strength and Weibull modulus of silicon carbide-titanium diboride (SiC-TiB₂) ceramics were studied. First, SiC-TiB₂ ceramics with 15 vol.% TiB₂ particles were processed using two green processing methods, spray drying (ST) and ball milling (SiC-15TiB₂). In addition, SiC-TiB2 ceramics with TiB₂ contents ranging from 0 to 100 vol.% were produced to determine a TiB₂ content that produced the best combination of mechanical properties. From spray drying, segregation of the TiB₂ particles in ST led to a granule-like microstructure and spontaneous microcracking in the final ceramic. In ceramics containing 20 and 40 vol.% TiB₂, the …

Experimental Feasibility Study Of A Passive Radio Frequency Identification-Based Distributed Beamforming Framework And Radio Frequency Tag Design For Achieving Dynamic Beamforming, Pratim Shah

Masters Theses

"Passive UHF RFID tags works on the principle of backscattering mechanism. In realistic environment, there are multiple objects and tags that create complex, multipath propagation scenarios with numerous null-points, reduced read range and read rate.

In general, the RF frontend of tags could be controlled such that the negative effects of multipath propagation are reduced or even inverted thus implementing a virtual beamforming. The theoretical framework of beamforming in RFID system, using additional tags as virtual antenna arrays, has been discussed before. The presented study evaluates the feasibility of such beamforming in passive RFID systems. Moreover, it synthesizes an appropriate …

Depth Profiling Of Pahs Treated With Activated Carbon Using In-Situ Spme, Ryan D. Stringer

Masters Theses

"Novel and efficient methods to measure the bioavailability of hydrophobic organic contaminants (HOCs) in contaminated sediments will play an important role in the acceptance of alternative sediment remediation strategies. In this project, solid phase microextraction (SPME) fibers, protected in perforated steel tubes, were used as in situ passive samplers to measure the treatment of activated carbon (AC) in polycyclic aromatic hydrocarbon (PAH) contaminated sediment. Contaminated sediment was treated with two modes of AC waterjet amendment. In the first treatment, a single 2-min injection was shot into the center of a test vessel and in the second treatment, multiple 7-sec injections …

Effect Of Lipid Composition On The Physical Properties Of Liposomes: A Light Scattering Study, Rajiv Kumar Yandrapati

Masters Theses

"The aim of this study was to investigate the effect of lipid composition on the physical properties of liposomes. Eight different types of liposomes were prepared for this study. Liposomes consisting of phosphatidylcholine (PC) and cholesterol were prepared in three different compositions 80/20, 50/50 and 20/80 respectively. Similarly liposomes consisting of PC and negatively charged phosphatidylserine (PS) were also prepared in three different compositions 80/20, 50/50 and 20/80 respectively. Two liposomes with the compositions 2:2:1:1 (cholesterol:PC:phosphatidylglycerol (PG): phosphatidylethanolamine (PE) ) which resembles the myelin membrane and 10:5:7.5:16 (PC:PE:PS:cholesterol) which mimics rat's neural membranes were also prepared. The liposomes were prepared …

Optical Coherence Tomography For Biomedical Imaging, Edward Henry Pienkowski

Masters Theses

"Two projects are presented in this thesis; 1) a hollow core, concentrically symmetric beam splitting Michelson interferometric probe for optical coherence tomography and 2) the imaging of bioactive ceramic scaffolds using swept source optical coherence tomography. The key component of the interferometer is a compact, small diameter probe composed of a collimating lens, hollow core beam splitting tube, and a focusing lens intended to be used for endoscopic imaging. The beam splitting tube was created by sputter coating the distal endface of a finely polished thick wall capillary tube with a highly reflective gold layer. Part of the light travels …

Evaluation Of The Reagan And Lamotte Sandstones In Southwestern Missouri For Carbon Dioxide Sequestration, Todd Jeffrey Miller

Masters Theses

"Carbon dioxide sequestration has been proposed as a way to reduce anthropogenic carbon dioxide emissions. Several characteristics are required in order for a geologic formation to be suitable for sequestration. There must be an impermeable confining layer to restrain CO₂ migration toward the surface, the porosity and permeability must be high enough to allow for long term injection and substantial storage capacity, and the formation must be strong enough for long term injection to occur without inducing fractures. In this work, The Reagan and Lamotte Sandstones near Springfield, Missouri were evaluated for the potential for carbon dioxide sequestration. The Derby-Doe …

The Tragedy Of The Carrots: Economics & Politics In The Choice Of Price Instruments, Brian Galle

Georgetown Law Faculty Publications and Other Works

Externalities are one of the most fundamental market-failure justifications for government action, and pigouvian taxes and subsidies are standard tools for correcting them. Even so, neither the legal nor economic literatures offer any comprehensive account of when policy makers should prefer one to the other. This Article takes up that task. Prior efforts to distinguish between “carrots” and “sticks” have generally been limited to the context of pollution regulation, and I show here that even those are incomplete. I also extend the analysis to the case of positive externalities, where there is no prior literature to speak of. Overall I …

The Federal Rules Of Civil Settlement, J. Maria Glover

Georgetown Law Faculty Publications and Other Works

The Federal Rules of Civil Procedure were originally based upon a straightforward model of adjudication: Resolve the merits of cases at trial and use pretrial procedures to facilitate accurate trial outcomes. Though appealing in principle, this model has little relevance today. As is now well known, the endpoint around which the Federal Rules were structured — trial — virtually never occurs. Today, the vast majority of civil cases terminate in settlement. This Article is the first to argue that the current litigation process needs a new regime of civil procedure for the world of settlement

This Article begins by providing …

Mining Diversity On Social Media Networks, Lu Liu, Feida Zhu, Meng Jiang, Jiawei Han, Lifeng Sun, Shiqiang Yang

Research Collection School Of Computing and Information Systems

The fast development of multimedia technology and increasing availability of network bandwidth has given rise to an abundance of network data as a result of all the ever-booming social media and social websites in recent years, e.g., Flickr, Youtube, MySpace, Facebook, etc. Social network analysis has therefore become a critical problem attracting enthusiasm from both academia and industry. However, an important measure that captures a participant’s diversity in the network has been largely neglected in previous studies. Namely, diversity characterizes how diverse a given node connects with its peers. In this paper, we give a comprehensive study of this concept. …