Physical Sciences and Mathematics Commons^™

Constraining The Near Tip Stresses Around Propagating Earthquake Ruptures: Frictional Response And Off Fault Tensile Crack Development, Monica Barbery

Earth & Environmental Sciences Theses

The near-tip stress, strain, and displacement fields around propagating ruptures are complicated, transient, and depend heavily on the evolution of the shear traction along the advancing rupture. This shear traction evolution is in turn influenced by dynamic weakening of the coefficient of friction. I have investigated near tip rupture mechanics using two approaches. In the first approach, I conduct experiments using a novel torsional Kolsky bar apparatus to investigate the frictional evolution of synthetic rock gouges at pressures, accelerations, and slip velocities expected to be operating in the seismogenic zone where most earthquakes nucleate. Microstructural analysis and 1-D thermal modeling …

Nanopetrophysics Characterization Of The Bakken Formation, Williston Basin, North Dakota, Usa, Joseph Ikechukwu Anyanwu

Earth & Environmental Sciences Theses

The recent oil boom in the US has been attributed to the result of hydraulic fracturing and horizontal drilling of shale plays. However despite this boom, production and maximum recovery is still limited to be only few percentage of the original oil in place. There have been many studies attempting to enhance the oil recovery of the Bakken Shale, however one area that has not been addressed is the structure of the nanopores storing and transporting the hydrocarbons. The pore geometry and connectivity of these nanopore structures affect the fluid flow and mass transport, which is linked to overall oil …

Multiple Approaches To Characterizing Pore Structure For A Range Of Sandstones Samples, Samson Sunday Arawole

Earth & Environmental Sciences Theses

Using various approaches, this work examines pore structure (geometry and connectivity) of a range of sandstone samples with their permeability varying by five orders of magnitude. The following four experimental approaches were used: Mercury Injection Capillary Pressure (MICP), Nuclear Magnetic Resonance (NMR), Fluid imbibition and Micro Ct Scan imaging. Fluid imbibition was also used to gauge pore connectivity of these sandstones. Furthermore, basic properties of air porosity and permeability were obtained on the samples before and after all four procedures and used as a basis for property comparison. “Specific” API brine permeability was also run on all samples for comparison …

A Geomechanical Approach To Evaluate Brittleness Using Well Logs: Mississippian Limestone, Northern Oklahoma, James Martin

Earth & Environmental Sciences Theses

Fracture density, or brittleness, of a rock is an important factor in understanding the characteristics of a reservoir and the reservoir's predisposition to fracturing. This becomes particularly critical when exploring and producing in tight or fracture dominated reservoirs such as that of the Mississippian limestone in the study area on the Northern Shelf of the Anadarko basin, Oklahoma. Previous work has defined brittleness on the basis of mineralogy or elastic rock parameters. This study explores a new definition of brittleness based on geomechanical principles that incorporates linear elastic rock properties as well as fracture toughness. The equation being used for …

The Variance Of Methane Adsorption And Its Relation To Thermal Maturity In The Marcellus Shale, Alexander Addison Miller

Earth & Environmental Sciences Theses

In unconventional shale gas plays, gas-in-place is a major factor in evaluating the shale’s potential and determining well density and lateral placement. The two main contributors to total gas-in-place are free gas and adsorbed gas. Gas in pores, “free” gas and adsorbed gas, which equal gas-in-place when summed, contribute to production from unconventional mudstone reservoirs like the Middle Devonian Marcellus Shale in the Appalachian Basin. Gas-in-place and production volumes however, vary throughout the different areas of Marcellus production in the basin. This paper analyzes the change in volumes of adsorbed methane through the geologically different regions of Marcellus production. Comparing …

Nano-Petrophysics Study Of The Three Forks Formation In The Williston Basin, North Dakota, U.S.A., Daniel Samuel Baah

Earth & Environmental Sciences Theses

The Late Devonian Three Forks Formation has increasingly become one of the productive plays in the Williston Basin, North Dakota. This growth has been attributed not only to new drilling and completion techniques but also to the availability of new geological information. Although production in the Three Forks Formation has increased, maximum recovery and overall hydrocarbon production is still limited. According to the North Dakota Industrial Commission, the oil recovery factor in the Three Forks Formation is 8.9±5.32%, so only a small percentage of the original oil in place is being produced.One of the most challenging aspects of reservoir quality …

Facial Expression Analysis Via Transfer Learning, Xiao Zhang

Electronic Theses and Dissertations

Automated analysis of facial expressions has remained an interesting and challenging research topic in the field of computer vision and pattern recognition due to vast applications such as human-machine interface design, social robotics, and developmental psychology. This dissertation focuses on developing and applying transfer learning algorithms - multiple kernel learning (MKL) and multi-task learning (MTL) - to resolve the problems of facial feature fusion and the exploitation of multiple facial action units (AUs) relations in designing robust facial expression recognition systems. MKL algorithms are employed to fuse multiple facial features with different kernel functions and tackle the domain adaption problem …

Predicting Irrigation Efficiency In The Rio Grande Project, Gerardo Melendez

Open Access Theses & Dissertations

Surface water losses in the Bureau of Reclamation’s (USBR) Rio Grande Project have become more prevalent within the past few years of the drought of the 2000’s. Simple regressions were performed in order to find correlations and determine factors that may affect the flows within the Rio Grande Project. Correlations were found in the difference between Rio Grande below Caballo flows and Rio Grande at El Paso flows, and between the diversion ratio and groundwater levels. Caballo Reservoir release amounts were found to be fairly well correlated with the difference between the Rio Grande below Caballo and the Rio Grande …

Robust Fast Direct Integral Equation Solver For Quasi-Periodic Scattering Problems With A Large Number Of Layers, Min Hyung Cho, Alex H. Barnett

Dartmouth Scholarship

We present a new boundary integral formulation for time-harmonic wave diffraction from two-dimensional structures with many layers of arbitrary periodic shape, such as multilayer dielectric gratings in TM polarization. Our scheme is robust at all scattering parameters, unlike the conventional quasi-periodic Green’s function method which fails whenever any of the layers approaches a Wood anomaly. We achieve this by a decomposition into near- and far-field contributions. The former uses the free-space Green’s function in a second-kind integral equation on one period of the material interfaces and their immediate left and right neighbors; the latter uses proxy point sources and small …

Redox Active Lipophilic Ruthenium Complexes As Potential Anti-Cancer Drugs, Nagham Alatrash

Chemistry & Biochemistry Dissertations

The dinuclear ruthenium(II) polypyridyl complexes (RPCs) [(phen)2Ru(tatpp)Ru(phen)2][PF6]4 (P4+) and the monomeric [(phen)2Ru(tatpp)]Cl2 (MP2+) are promising candidates for anti-cancer drug development in terms of the observed anti-tumor activity in vivo and in vitro. These complexes contain the redox-active tatpp (9,11,20,22-tetraazatetrapyrido[3,2-a:2'3'-c:3'',2''-1:2''',3''']-pentacene) ligand which seems to be the critical component for biological activity. These complexes cleave DNA when reduced in situ to a radical species. Both complexes exhibit selective cytotoxicity toward cultured malignant cell lines and showed inhibition of tumor growth in vivo. This work expands on this platform by preparing and examining more lipophilic analogues of P4+ and MP2+. Specifically, four lipophilic …

Towards Establishing The Mechanism Of Dna Cleavage By Redox-Active Ruthenium(Ii) Polypyridyl Complexes, Cynthia Ann Griffith

Chemistry & Biochemistry Theses

In earlier reports, it was established that ruthenium (II) polypyridyl complexes RPCs, [Ru(tatpp)]²⁺ (3²⁺) and [Ru(tatpp)Ru]⁴⁺ (4⁴⁺) show potent antitumor properties in vivo in nude mouse lung cancer models.² These RPC's undergo in vitro reduction by glutathione (GSH) to form a species that induces DNA cleavage. It was also demonstrated that the mechanism of DNA cleavage follows an unusual dependence on dioxygen (O₂) concentration: the increase in cleavage activity of these RPC complexes are inversely proportional to O₂ concentration. In fact, cleavage is quenched in the complete absence of O₂. In this work we currently postulate when 3²⁺ and 4⁴⁺ …

Nickel (Ii) Pincer Complexes Supported By 2,6-Bis(3,5-Ditolyl-2-Pyrrolyl)Pyridine, Abhijit Pramanik

Chemistry & Biochemistry Theses

Ni(II) pincer complexes are among the most important and useful compounds in homogeneous catalysis. Significant advancement has been made in this field in recent years. Many Ni(II) pincer complexes have been prepared and utilized in various catalytic reactions e.g. cross coupling reactions, C-H activation, carbon dioxide activation etc. Still, nickel(II) complexes supported by the pincer ligand with three nitrogen donors are relatively less explored and catalytic applications with those complexes are scarce in literature. This thesis describes the synthesis of a new pyrrolyl pyridine based pincer ligand and its Ni(II) complexes. The pyrrolyl pyridine pincer ligand, a relatively new class …

A Potential Long-Lived Upper Cretaceous Paleodrainage System In The U.S. Southwestern Georgia-Southeastern Alabama Region, Daniel L. Black

Theses and Dissertations

No abstract provided.

Studies On Reductive Horner-Wadsworth-Emmons Olefination Using Mixed Silyl Acetals, Udaya Sree Dakarapu

Chemistry & Biochemistry Theses

Homologation of esters to α,β-unsaturated esters is a useful transformation in organic synthesis. We have developed a new approach for the Ir-catalyzed reductive Horner-Wadsworth-Emmons olefination of esters; a one-pot method for the transformation of esters to α,β-unsaturated esters utilizing silyl acetals as aldehyde equivalents followed by Horner-Wadsworth-Emmons olefination. Lewis based activation of silyl acetals formed by Ir-catalyzed hydrosilylation of esters initially generates putative penta-coordinate silicate acetals which fragment into aldehydes, silanes and alkoxides in situ. The alkoxides deprotonate phosphonate esters which subsequently react with the aldehydes to furnish α,β-unsaturated esters. This method is operationally simple compared with aluminium hydride-based reductive …

(3+2)-Cycloaddition Reactions Of Oxyallyl Cations, Jimmy Wu, Hui Li

Dartmouth Scholarship

The (3+2)-cycloaddition reaction involving oxyallyl cations has proven to be a versatile and efficient approach for the construction of five-membered carbo- and heterocycles, which are prevalent frameworks in natural products and pharmaceuticals. The following article will provide a brief summary of recent disclosures on this process featuring chemo-, regio- and diastereoselective oxyallyl cycloadditions with both electron-rich and electron-deficient 2π partners.

บทบรรณาธิการ

Thai Environment

No abstract provided.

การบำบัดฟอร์มัลดีไฮด์ในน้ำเสียสังเคราะห์โดยการดูดซับด้วยถ่านกกกลมและถ่านธูปฤาษีผสมดิน ร่วมกับระบบหญ้ากรองน้ำเสียและระบบพื้นที่ชุ่มน้ำเทียมในหน่วยทดลองขนาดเล็ก, วัชรพงษ์ วาระรัมย์, นิพนธ์ ตังคณานุรักษ์, คณิตา ตังคณานุรักษ์

Thai Environment

No abstract provided.

การบำบัดสีย้อมผ้าจากน้ำเสียโรงงานฟอกย้อมสิ่งทอด้วยจุลินทรีย์, นิตยา ผาสุขพันธุ์

Thai Environment

No abstract provided.

โครงการสำรวจการกระจายตัวและแหล่งที่มาของการปนเปื้อนโลหะหนักในเขตพื้นที่แหล่งแร่ทองคำภูทับฟ้า ตำบลเขาหลวง อำเภอวังสะพุง จังหวัดเลย : ส่วนที่ 3 น้ำผิวดิน, อรุบล โชติพงศ์, จักรพันธ์ สุทธิรัตน์, อนุ กัลลประวิทย์

Thai Environment

No abstract provided.

การกำจัดขยะมูลฝอยในประเทศไทย, สมรัฐ เกิดสุวรรณ, กรองแก้ว เลาหลิดานนท์, อ.ปัญจ์ปพัชรกร บุญพร้อม

Thai Environment

No abstract provided.

เรียนรู้จากเมืองฟิลาเดลเฟีย มลรัฐเพนซิลวาเนีย ประเทศอเมริกา : การจัดการบัญหาน้ำท่าชุมชน อย่างยั่งยืนและเป็นมิตรต่อสิ่งแวดล้อม, Anootnara Talkul Kuster, Anthony C. Kuster

Thai Environment

No abstract provided.

สึนามิ-พลิกวิกฤตให้เป็นโอกาสการเรียนรู้วิทยาศาสตร์สุขภาพในประเทศไทย, สมฤดี จิตประไพ

Thai Environment

No abstract provided.

การเปลี่ยนผ่านสังคมไทยสู่สังคมคาร์บอนต่ำ : จากนโยบาายสู่การปฏิบัติจริง, สุทธิรัตน์ กิตติพงษ์วิเศษ

Thai Environment

No abstract provided.

On The Catalytic Activity Of Palladium Nanoparticles-Based Anodes Towards Formic Acid Electro-Oxidation: Effect Of Electrodeposition Potential, Islam M. Al-Akraa Dr., Ahmad M. Mohammad Prof, Mohamed S. El-Deab Prof, Bahgat E. El-Anadouli Prof

Chemical Engineering

In this investigation, the catalytic activity of palladium nanoparticles (PdNPs)-modified glassy carbon (GC) (simply noted as PdNPs/GC) electrodes towards the formic acid electro-oxidation (FAO) was investigated. The deposition of PdNPs on the GC substrate was carried out by a potentiostatic technique at different potentials and the corresponding influence on the particles size and crystal structure of PdNPs as well as the catalytic activity towards FAO was studied. Scanning electron microscopy (SEM) demonstrated the deposition of PdNPs in spherical shapes and the average particle size of PdNPs deposited at a potential of 0 V vs. Ag/AgCl/KCl(sat.) was the smallest (ca. 8 …

Advances In Direct Formic Acid Fuel Cells: Fabrication Of Efficient Ir/Pd Nanocatalysts For Formic Acid Electro-Oxidation, Islam M. Al-Akraa, Ahmad M. Mohammad, Mohamed S. El-Deab Prof, Bahgat E. El-Anadouli Prof

Chemical Engineering

No abstract provided.

Parity And Diabetes Risk Among Hispanic Women From Colombia: Cross-Sectional Evidence, Pablo Cure, Heather J. Hoffman, Carlos Cure-Cure

Epidemiology Faculty Publications

Objective

The association between parity and type 2 diabetes has been studied in developed countries and in Singapore and Chinese women but not in Hispanics. Herein we evaluated the association between parity (number of live births) with diabetes in a group of Hispanic postmenopausal women from Colombia.

Research design and methods

Herein we evaluated the association between parity and diabetes in a population of 1,795 women from Colombia. Women were divided in birth categories (0 [referent], 1 or 2, 3–5, 6 or > births). Medical history of diabetes and anthropometric characteristics were recorded. Logistic regressions were performed in order to find …

A Systematic Review And Meta-Regression Analysis Of Lung Cancer Risk And Inorganic Arsenic In Drinking Water., Steven H. Lamm, Hamid Ferdosi, Elisabeth K. Dissen, Ji Li, Jaeil Ahn

Epidemiology Faculty Publications

High levels (> 200 µg/L) of inorganic arsenic in drinking water are known to be a cause of human lung cancer, but the evidence at lower levels is uncertain. We have sought the epidemiological studies that have examined the dose-response relationship between arsenic levels in drinking water and the risk of lung cancer over a range that includes both high and low levels of arsenic. Regression analysis, based on six studies identified from an electronic search, examined the relationship between the log of the relative risk and the log of the arsenic exposure over a range of 1-1000 µg/L. The …

First Measurement Of The Polarization Observable E In The P→ (Ɣ→, Π+) In Reaction Up To 2.25 Gev, S. Strauch, W. J. Briscoe, M. Döring, E. Klempt, V. A. Nikonov, E. Pasyuk, D. Rönchen, A.V. Sarantsev, I. Strakovsky, R. Workman, K. P. Adhikari, D. Adikaram, L. El Fassi

Physics Faculty Publications

First results from the longitudinally polarized frozen-spin target (FROST) program are reported. The double-polarization observable E, for the reaction ɣ^→p^→→π+n, has been measured using a circularly polarized tagged-photon beam, with energies from 0.35 to 2.37 GeV. The final-state pions were detected with the CEBAF Large Acceptance Spectrometer in Hall B at the Thomas Jefferson National Accelerator Facility. These polarization data agree fairly well with previous partial-wave analyses at low photon energies. Over much of the covered energy range, however, significant deviations are observed, particularly in the high-energy region where high-L multipoles contribute. The data have been …

Fragmentation Of Fast Josephson Vortices And Breakdown Of Ordered States By Moving Topological Defects, Ahmad Sheikhzada, Alex Gurevich

Physics Faculty Publications

Topological defects such as vortices, dislocations or domain walls define many important effects in superconductivity, superfluidity, magnetism, liquid crystals, and plasticity of solids. Here we address the breakdown of the topologically-protected stability of such defects driven by strong external forces. We focus on Josephson vortices that appear at planar weak links of suppressed superconductivity which have attracted much attention for electronic applications, new sources of THz radiation, and low-dissipative computing. Our numerical simulations show that a rapidly moving vortex driven by a constant current becomes unstable with respect to generation of vortex-antivortex pairs caused by Cherenkov radiation. As a result, …

Corrigendum To "Suppression Of ϒ Production In D + Au And Au + Au Collisions At √Sɴɴ = 200 Gev" (Phys. Lett. B Vol 735 (2014) 127-137), J. Adamczyk, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, J. Alford, C. D. Anson, A. Aparin, D. Arkhipkin, S. Bültmann

Physics Faculty Publications

No abstract provided.