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2012

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Articles 10951 - 10980 of 12196

Full-Text Articles in Physical Sciences and Mathematics

Chemostratigraphy, Paleoceanography, And Sequence Stratigraphy Of The Pennsylvanian-Permian Section In The Midland Basin Of West Texas With Focus On The Wolfcamp Formation, Milton Cortez Jan 2012

Chemostratigraphy, Paleoceanography, And Sequence Stratigraphy Of The Pennsylvanian-Permian Section In The Midland Basin Of West Texas With Focus On The Wolfcamp Formation, Milton Cortez

Earth & Environmental Sciences Theses

The late Pennsylvanian to early Permian rocks (Wolfcampian and Leonardian) of the Midland Basin represent a single lithologic unit composed primarily of calcareous mudrocks, siliceous mudrocks, muddy carbonate-clast conglomerates, and skeletal packstones/grainstones at the approximate depositional center located in Reagan County, Texas. Pure versions of these lithologic end-members are discretely distributed among a multitude of transitional lithofacies. The Midland Basin evolved in the foreland of the Ouachita Fold-belt from Mississippian to early Permian time along-side several sub-basins of the Permian Basin. These basins were formed by disseverance and uplift associated with the continental collision of Laurasia and Gondwana to form …

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Chemostratigraphy And Geochemical Constraints On The Deposition Of The Bakken Formation, Williston Basin, Eastern Montana And Western North Dakota, David Nyrup Maldonado Jan 2012

Chemostratigraphy And Geochemical Constraints On The Deposition Of The Bakken Formation, Williston Basin, Eastern Montana And Western North Dakota, David Nyrup Maldonado

Earth & Environmental Sciences Theses

The late Devonian-early Mississippian Bakken Formation was deposited in a structural-sedimentary intracratonic basin that extends across a large part of modern day North Dakota, eastern Montana, and the southern portion of Canada's Saskatchewan Province. The deposition of the Bakken Formation occurred during a fascinating period of geologic time that is linked to one of the five major mass extinctions. The occurrences of these mass extinctions are recorded worldwide as organic rich mud rocks similar to the ones found in the Bakken Formation. Collectively, the Bakken Formation consists of a middle dolomitic siltstone that is representative of a transgressive deposit and …

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Chemostratigraphy And Paleoenvironmental Significance Of The Pennsylvanian Smithwick Formation, Northern Llano Uplift Region, Texas, Rene Bernabe Ovalle-Rauch Jan 2012

Chemostratigraphy And Paleoenvironmental Significance Of The Pennsylvanian Smithwick Formation, Northern Llano Uplift Region, Texas, Rene Bernabe Ovalle-Rauch

Earth & Environmental Sciences Theses

The Early Pennsylvanian (Bashkirian-Moscovian) Smithwick Formation of Central Texas has been previously described as a marine transgressive, fairly homogeneous and fine-grained dark shale sequence with varying local depositional lithofacies. The deposition of the Smithwick shale through the southern margin of the Fort Worth Basin (FWB) has shown large variability in thickness and deposition style. Lithological heterogeneity of the bounding units throughout the basin is inferred to be the result of a combination of depositional, tectonic and eustatic variations. Regional structural instability from Late Mississippian to Early Pennsylvanian is linked to the reactivation of the Ouachita geosyncline and thrust front, causing …

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An Atlas Of Cenozoic Climate Zones, Clinton Whitaker Crowley Jan 2012

An Atlas Of Cenozoic Climate Zones, Clinton Whitaker Crowley

Earth & Environmental Sciences Theses

This atlas illustrates global climatic zones in five major turning points of Cenozoic climate history: the K/T, the Paleocene/Eocene Thermal Maximum (PETM), the Eocene/Oligocene Transition (EOT), the Late Miocene (Messinian), and the Last Glacial Maximum (LGM). The mapswere produced from a combination of climate simulations (FOAM, CCSM, ECHAM, BESTGUESS, GENESIS and others) and climatic zone reconstructions based on lithologic data. Paleogeographic base maps of the time intervals from the PALEOMAP Project were then illustrated with an artist's rendition of the Earth's appearance. The color scheme was based onNASA's Blue Marble images. An overview of the conditions that shaped global climate …

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Surface Lineaments And Lithofacies Distribution Of The Tyler Formation In Southwestern North Dakota, Nicolas Beltran Guerrero Jan 2012

Surface Lineaments And Lithofacies Distribution Of The Tyler Formation In Southwestern North Dakota, Nicolas Beltran Guerrero

Earth & Environmental Sciences Theses

The purpose of this study is to investigate whether a correlation exists between surface lineaments and lithofacies distribution of the Pennsylvanian Tyler Formation in the southwest portion of North Dakota of the Williston Basin. If a cost-effective technique to locate preserved fluvial sandstone bodies can be developed, the Tyler Formation has the potential to be a productive hydrocarbon exploration target. Many intercratonic sedimentary basins, such as the Williston Basin, exhibit nearly orthogonal surface lineaments. In the case of the Cooper Basin in Australia, lineament analysis helped locate areas where Proterozoic rocks are fractured and filled with quartz veins containing precious …

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A Reverberation Lag For The High-Ionization Component Of The Broad-Line Region In The Narrow-Line Seyfert 1 Mrk 335, C. J. Grier, B. M. Peterson, R. W. Pogge, K. D. Denney, M. C. Bentz, Paul Martini, S. G. Sergeev, S. Kaspi, Y. Zu, C. S. Kochanek, B. J. Shappee, C. Araya Salvo, T G. Beatty, J. C. Bird, D. J. Bord, G. A. Borman, X. Che, C. Chen Jan 2012

A Reverberation Lag For The High-Ionization Component Of The Broad-Line Region In The Narrow-Line Seyfert 1 Mrk 335, C. J. Grier, B. M. Peterson, R. W. Pogge, K. D. Denney, M. C. Bentz, Paul Martini, S. G. Sergeev, S. Kaspi, Y. Zu, C. S. Kochanek, B. J. Shappee, C. Araya Salvo, T G. Beatty, J. C. Bird, D. J. Bord, G. A. Borman, X. Che, C. Chen

Dartmouth Scholarship

We present the first results from a detailed analysis of photometric and spectrophotometric data on the narrow-line Seyfert 1 (NLS1) galaxy Mrk 335, collected over a 120 day span in the fall of 2010. From these data we measure the lag in the He ii λ 4686 broad emission line relative to the optical continuum to be 2.7 °æ 0.6 days and the lag in the Hβλ 4861 broad emission line to be 13.9 °æ 0.9 days. Combined with the line width, the He ii lag yields a black hole mass MBH = (2. 6 °æ 0. 8) °ø 107M …

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Electrolysis Of Coal And Carbon Slurry Suspensions, Moustafa Reda Aboushabana Jan 2012

Electrolysis Of Coal And Carbon Slurry Suspensions, Moustafa Reda Aboushabana

Chemistry & Biochemistry Dissertations

In this dissertation study, different ranks of coal and carbons were tested as anode depolarizers in a three electrode electrochemical cell designed for hydrogen generation. The focus of this study was mainly Texas lignite coal (TXLC). For comparison purposes, other coals were carefully chosen to cover the range from high-rank, intermediate-rank, and to low-rank (TXLC). Carbon blacks and carbon nanotubes were also studied to gain more insight into the mechanistic aspects of the electrolysis process.The Fe3+/2+ redox couple was used as an oxidation mediator throughout the study. It shuttles the electrons between the coal or carbon particles and the anode …

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Bioanalytical Lc-Ms: Streamlined Sampled Preparation And Novel Ambient Ionization Techniques, Samuel Hsiao-Chieh Yang Jan 2012

Bioanalytical Lc-Ms: Streamlined Sampled Preparation And Novel Ambient Ionization Techniques, Samuel Hsiao-Chieh Yang

Chemistry & Biochemistry Dissertations

Bioanalysis has gained importance in the scientific at an exponential rate. The focus of these works attempt to seek new approaches towards faster and more efficient bioanalysis that require little to no sample preparation. One approach is the use of new restricted access media trap technologies to facilitate an online sample preparation platform. A demonstration of the advantages of RAM involves the trace level detection of bisphenol A, an environmental contaminant. A bulk derivatization strategy used in combination with RAM trap technologies is adopted to boost sensitivity without the use of traditional sample preparation methods. Another strategy is the use …

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New Bonded Phase Materials For Separtions, Sirantha Perera Jan 2012

New Bonded Phase Materials For Separtions, Sirantha Perera

Chemistry & Biochemistry Dissertations

Separations play an important role in day to day life as well as in science and technology. This dissertation focuses on novel and versatile techniques involving synthesizing new bonded chiral stationary phases (CSPs) and using existing CSPs for the separation of target chiral analytes in HPLC. It also includes development of new ionic liquid (IL) based silica bonded polymeric coatings for solid phase microextraction gas chromatography (SPME-GC) in headspace and direct immersion for polar analytes and finally, coupling new MALDI matrix bonded SPME fibers and laser desorption for rapid identification of biological materials. Enantiomerically pure Ru complexes were introduced as …

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Mixed Lineage Leukemia Histone Methylases In Hormonal Regulation Of Hox Genes And Their Disruption By Endocrine Disrupting Chemicals, Imran Hussain Jan 2012

Mixed Lineage Leukemia Histone Methylases In Hormonal Regulation Of Hox Genes And Their Disruption By Endocrine Disrupting Chemicals, Imran Hussain

Chemistry & Biochemistry Dissertations

Homeobox (HOX) genes are highly conserved family of genes that play vital roles during cell differentiation and embryogenesis. Of the 39 HOX genes present in human, HOXC6 is a critical players in mammary gland development, milk production and is over-expressed in breast and prostate cancer. I demonstrated that HOXC6 is transcriptionally regulated by estrogen (E2). The HOXC6 promoter contains two putative estrogen response elements (EREs). Promoter analysis using luciferase-based reporter assay demonstrated that both EREs are responsive to E2, ERE1half being more responsive than ERE2half. Estrogen receptors alpha and beta (ERα and ERβ) bind to these EREs …

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Catalytic Hydro-Liquefaction Of Lignite Coals Under Mild Conditions, Mahir Alrashdan Jan 2012

Catalytic Hydro-Liquefaction Of Lignite Coals Under Mild Conditions, Mahir Alrashdan

Chemistry & Biochemistry Dissertations

A low-cost thermo-chemical process for the liquefaction of lignite coals is being developed at the University of Texas at Arlington (UTA). The coal-toliquids (CTL) project has focused of developing a liquefaction process which is made economically attractive by the combination of using a cheap coal feedstock, such as lignite, use of cheap disposable catalysts, and limiting the operating conditions to mild temperatures and pressures, at least relative to many existing CTL processes. The UTA-CTL process uses a solvent which is derived from the pyrolysis of lignite, an inexpensive iron-based catalyst and mild temperatures and pressures to hydrogenate and depolymerize the …

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Increasing Lipophilicity Of Redox Active Ruthenium Complexes As A Means To Enhance Cytotoxicity And Reduce Animal Toxicity, Nagham Alatrash Jan 2012

Increasing Lipophilicity Of Redox Active Ruthenium Complexes As A Means To Enhance Cytotoxicity And Reduce Animal Toxicity, Nagham Alatrash

Chemistry & Biochemistry Theses

The dinuclear and monomeric ruthenium(II) polypyridyl complexes [(phen)2Ru(tatpp)Ru(phen)2]Cl4 (P) and monomer [(phen)2Ru(tatpp)]Cl2 (MP) are promising candidates for anticancer drug development in terms of the observed anti-tumor activity in mouse models. These complexes contain the redox-active tatpp bridging ligand which seems to be the critical component for biological activity. Ruthenium complexes containing the tatpp ligand have been shown to cleave DNA with an inverse dependence on the [O2], exhibit selective and good cytotoxicity towards a number of cultured malignant cell lines, and have tolerable acute toxicity in mice. Significantly, the animal toxicity of P and MP is significantly less than simple …

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Molecular Engineered Myoglobin With Unnatural Amino Acids As A Peroxidase, Kananke Sriyani Liyanage Jan 2012

Molecular Engineered Myoglobin With Unnatural Amino Acids As A Peroxidase, Kananke Sriyani Liyanage

Chemistry & Biochemistry Theses

Myoglobin (Mb) has been used as a model system to mimic other biologically important heme proteins like cytochrome P450 due to its ability to prepare mixed ligand complexes with different valencies, such as ferric, ferrous and ferryl species. It has been engineered to perform peroxidase, peroxygenase, monooxygenase and catalase activities. However, previous work on this area has shown that the distal histidine (H64) in the active of wild-type Mb is a critical residue, which destabilizes compound I, the reactive intermediate of the catalytic cycle (a ferryl ð-porphyrin radical cation). Therefore in this study we replaced H64 with a smaller residue, …

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An Investigation Into A Hybrid Genetic Programming And Ant Colony Optimization Method For Credit Scoring, Rojin Aliehyaei Jan 2012

An Investigation Into A Hybrid Genetic Programming And Ant Colony Optimization Method For Credit Scoring, Rojin Aliehyaei

Theses and Dissertations

This thesis proposes and investigates a new hybrid technique based on Genetic Programming (GP) and Ant Colony Optimization (ACO) techniques for inducing data classification rules. The proposed hybrid approach aims to improve on the accuracy of data classification rules produced by the original GP technique, which uses randomly generated initial populations. This hybrid technique relies on the ACO technique to produce the initial populations for the GP technique. To evaluate and compare their effectiveness in producing good data classification rules, GP, ACO, and hybrid techniques were implemented in the C programming language. The data classification rules were created and evaluated …

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San Miguel Volcanic Seismicity And Structure In Central America: Insight Into The Physical Processes Of Volcanoes, Ezer Patlan Jan 2012

San Miguel Volcanic Seismicity And Structure In Central America: Insight Into The Physical Processes Of Volcanoes, Ezer Patlan

Open Access Theses & Dissertations

San Miguel volcano lies near the city of San Miguel, El Salvador (13.43°N, 88.26°W). An active stratovolcano, it presents a significant natural hazard for the city of San Miguel. In general, the internal state and activity of volcanoes like San Miguel remains an important component to understanding volcanic hazards. The main technology for addressing volcanic hazards and associated processes is through the analysis of data collected from the deployment of seismic sensors that record ground motion. Six seismic stations were deployed by UTEP around San Miguel volcano during the 2007-2008 the time period to define internal structure or magmatic plumbing …

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บทบรรณาธิการ Jan 2012

บทบรรณาธิการ

Thai Environment

No abstract provided.

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สรุปข่าวสิ่งแวดล้อม ปี 2554 Jan 2012

สรุปข่าวสิ่งแวดล้อม ปี 2554

Thai Environment

No abstract provided.

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สัมภาษณ์พิเศษ "ดร. ธีระชน มโนมัยพิบูลย์ Jan 2012

สัมภาษณ์พิเศษ "ดร. ธีระชน มโนมัยพิบูลย์

Thai Environment

No abstract provided.

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เรื่องของน้ำในภาวะน้ำท่วม, เทพวิทูรย์ ทองศรี Jan 2012

เรื่องของน้ำในภาวะน้ำท่วม, เทพวิทูรย์ ทองศรี

Thai Environment

No abstract provided.

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มุมมองด้านสิ่งแวดล้อมของอีเอ็มบอลในการใช้งานกับน้ำท่วมขัง: การวางแผนอนาคตของอีเอ็มบอล, อรทัย ชวาลภาฤทธิ์ Jan 2012

มุมมองด้านสิ่งแวดล้อมของอีเอ็มบอลในการใช้งานกับน้ำท่วมขัง: การวางแผนอนาคตของอีเอ็มบอล, อรทัย ชวาลภาฤทธิ์

Thai Environment

No abstract provided.

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อากาศ..เหตุเกิดหลังน้ำลด, พรรณวดี สุวัฒิกะ Jan 2012

อากาศ..เหตุเกิดหลังน้ำลด, พรรณวดี สุวัฒิกะ

Thai Environment

No abstract provided.

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ปัญหาขยะล้นเมืองจากเหตุการณ์น้ำท่วม, พันธวัศ สัมพันธ์พานิช Jan 2012

ปัญหาขยะล้นเมืองจากเหตุการณ์น้ำท่วม, พันธวัศ สัมพันธ์พานิช

Thai Environment

No abstract provided.

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สถานการณ์น้ำท่วม: ผลกระทบต่อสุขภาพ, ไกรชาติ ตันตระการอาภา, อัมรินทร์ คงทวีเลิศ Jan 2012

สถานการณ์น้ำท่วม: ผลกระทบต่อสุขภาพ, ไกรชาติ ตันตระการอาภา, อัมรินทร์ คงทวีเลิศ

Thai Environment

ปี พ.ศ. 2554 คงได้รับการจารึกให้เป็นเหตุการณ์ที่อยู่ในหน้าประวัติศาสตร์ชาติไทยที่ส่งผลกระทบต่อประชาชน ชาวไทยกว่าสิบล้านคน ครอบคลุมทั่วทุกภาคของประเทศ นั่นคือปีที่ได้รับการกล่าวขานว่าเกิด "มหาอุทกภัย" ของประเทศไทย เริ่มตั้งแต่การเกิดพายุดีเปรสชั่นช่วงปลายมีนาคมจากอิทธิพลความกดอากาศจากประเทศจีน ส่งผลให้พื้นที่ภาคใต้ของประเทศประสบกับอุทกภัยใน 8 จังหวัด ทําาให้มีผู้เสียชีวิต13 ราย ราษฎร์ได้รับผลกระเทบ 842,324 คน ณ วันที่ 1 เมษายน 2554 ปริมาณน้ำฝนในช่วง 23-30 มีนาคม 2554 มีปริมาณน้ำฝนในช่วง 200 มิลลิเมตรถึง 1,200 มิลลิเมตร ปริมาณสูงสุดวัดได้ในพื้นที่ของจังหวัดสุราษฎรธานี (http://reliefweb.int/node/394390) ในวันที่ 15 เมษายน 2554 สรุปยอดผู้เสียชีวิตทั้งสิ้น 64 รายจังหวัดที่มีผู้เสียชีวิตมากที่สุดคือ นครศรีธรรมราช 26 ราย (กรมป้องกันและบรรเทาสาธารณภัย ศูนย์อํานวยการบรรเทาสาธารณภัย www.disaster.go.th และ www.nirapai.com) หลังจากสงกรานต์ผ่านไป ได้เกิดอุทกภัยขึ้นที่ภาคเหนือตั้งแต่ พะเยา เริ่มประมาณ 11 พฤษภาคม 2554 และในพื้นที่อื่นๆ ของภาคเหนือในช่วงเดือนสิงหาคม ได้แก่ น่าน เชียงใหม่ อุตดิตถ์ ลําาปาง แม่ฮ่องสอน ลําพูน แพร่และเชียงราย พิจิตร หลังจากช่วงดังกล่าวมวลน้ำและปริมาณน้ำฝนได้ไหลลงสู่ที่ลุ่มภาคเหนือตอนล่างและภาคกลางตอนบน ได้แก่ กําแพงเพชร นครสวรรค์ ชัยนาท และสู่พื้นที่ภาคกลาง สิงห์บุรี อ่างทอง ลพบุรี พระนครศรีอยุธยา ปทุมธานี นนทบุรี นครปฐม กรุงเทพมหานคร สมุทรสาคร ซึ่งได้สร้างความเสียหายอย่างมาก จนหลายคนได้กล่าวว่าเป็นมหาอุทกภัยของประเทศไทย ไม่ต่างไปจาก ปี พ.ศ. 2538 ในขณะเดียวกันภาคตะวันออกเฉียงเหนือก็ประสบภัยกับน้ำท่วมไม่แตกต่างจากภาคอื่นๆ ของประเทศ อาทิ กาฬสินธ์ บุรีรัมย์ ขอนแก่น เป็นต้น

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การรับมือกับสถานการณ์น้ำท่วม, วรรณี พฤฒิถาวร Jan 2012

การรับมือกับสถานการณ์น้ำท่วม, วรรณี พฤฒิถาวร

Thai Environment

No abstract provided.

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สิ่งแวดล้อมน่ารู้ Jan 2012

สิ่งแวดล้อมน่ารู้

Thai Environment

No abstract provided.

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กิจกรรมสิ่งแวดล้อม Jan 2012

กิจกรรมสิ่งแวดล้อม

Thai Environment

No abstract provided.

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Development Of Tailor-Designed Gold-Platinum Nanoparticles Binary Catalysts For Efficient Formic Acid Electrooxidation, Islam M. Al-Akraa Dr, Ahmad M. Mohammad Prof, Mohamed S. El-Deab Prof, Bahgat E. El-Anadouli Prof Jan 2012

Development Of Tailor-Designed Gold-Platinum Nanoparticles Binary Catalysts For Efficient Formic Acid Electrooxidation, Islam M. Al-Akraa Dr, Ahmad M. Mohammad Prof, Mohamed S. El-Deab Prof, Bahgat E. El-Anadouli Prof

Chemical Engineering

The modification of a glassy carbon (GC) electrode with platinum (PtNPs) and gold (AuNPs) nanoparticles is targeted to fabricate efficient anodes for the electrooxidation of formic acid (FA). A proper adjustment of the deposition sequence of PtNPs and AuNPs could eventually enhance the electrocatalytic activity of the electrode in such a way that suppresses the CO poisoning effect during FA oxidation. The highest catalytic activity is obtained at the Au/Pt/GC electrode (with PtNPs firstly deposited on the GC electrode followed by AuNPs). This superb enhancement is quantified by comparing the relative ratio of the direct vs. the indirect oxidation peaks …

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Microfluidic Separation Of Live And Dead Yeast Cells Using Reservoir-Based Dielectrophoresis, Saurin Patel, Daniel Showers, Pallavi Vedantam, Tzuen-Rong Tzeng, Shizhi Qian, Xiangchun Xuan Jan 2012

Microfluidic Separation Of Live And Dead Yeast Cells Using Reservoir-Based Dielectrophoresis, Saurin Patel, Daniel Showers, Pallavi Vedantam, Tzuen-Rong Tzeng, Shizhi Qian, Xiangchun Xuan

Mechanical & Aerospace Engineering Faculty Publications

Separating live and dead cells is critical to the diagnosis of early stage diseases and to the efficacy test of drug screening, etc. This work demonstrates a novel microfluidic approach to dielectrophoretic separation of yeast cells by viability. It exploits the cell dielectrophoresis that is induced by the inherent electric field gradient at the reservoir-microchannel junction to selectively trap dead yeast cells and continuously separate them from live ones right inside the reservoir. This approach is therefore termed reservoir-based dielectrophoresis (rDEP). It has unique advantages as compared to existing dielectrophoretic approaches such as the occupation of zero channel space and …

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A Quality Improvement Initiative Using A Novel Travel Survey To Define High-Risk International Travel And Promote Patient-Centered Counseling, Craig A. Mackaness Do, Mark Knouse Md, Suzanne J. Templer Do, Deepti Verma Md, Allison Osborne Ba, Michael J. Weiss Mph Jan 2012

A Quality Improvement Initiative Using A Novel Travel Survey To Define High-Risk International Travel And Promote Patient-Centered Counseling, Craig A. Mackaness Do, Mark Knouse Md, Suzanne J. Templer Do, Deepti Verma Md, Allison Osborne Ba, Michael J. Weiss Mph

Department of Medicine

No abstract provided.

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The Rock 2012, School Of Engineering And Computer Science Jan 2012

The Rock 2012, School Of Engineering And Computer Science

The Rock

No abstract provided.

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