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2010

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Preliminary Investigation Of Iron Protoporphyrin Sams On Platinum Electrodes By Surface Enhanced Vibrational Spectroscopies, Min Ma, Yao-Yue Yang, Han-Xuan Zhang, Wen-Bin Cai Aug 2010

Preliminary Investigation Of Iron Protoporphyrin Sams On Platinum Electrodes By Surface Enhanced Vibrational Spectroscopies, Min Ma, Yao-Yue Yang, Han-Xuan Zhang, Wen-Bin Cai

Journal of Electrochemistry

In situ SERS and ATR-SEIRAS were applied to investigate the electrochemical and structural properties of iron protoporphyrin IX (FePP) self-assembled monolayers (SAMs) on Pt electrodes in 0. 1 mol· L -1 HClO4. The potential dependent SERS spectra of the FePP SAM on a roughened Pt electrode with the enhancement factor of ca. 40 were acquired with the excitation line of 514 nm. Analyses of SERS data over the potential region from 0. 5 to -0. 3 V enabled to obtain potential dependent adsorption isotherms,from which the formal redox potential could be estimated to be ca. -0. 2 V. …

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Solid State Nmr Studies Of Lithium Manganese Silicate As Positive Electrode Materials For Li-Ion Batteries, Hu Cheng, Zi-Geng Liu, Yi-Xiao Li, Zhong Chen, Yong Yang Aug 2010

Solid State Nmr Studies Of Lithium Manganese Silicate As Positive Electrode Materials For Li-Ion Batteries, Hu Cheng, Zi-Geng Liu, Yi-Xiao Li, Zhong Chen, Yong Yang

Journal of Electrochemistry

The Li2MnSiO4 cathode material for lithium ion batteries was synthesized by sol-gel assisted hydrothermal method. XRD,FTIR and SS-NMR were used to study the phase,structure and morphology of obtained samples. Electrochemical performance of cathode material was tested. The results show that the main phase of sample prepared was Li2MnSiO4,whereas a small amount of impurities (Li2CO3) were existed. The Li2MnSiO4 cathode material gave an initial discharging capacity of about 190 mAh·g -1. But this capacity faded rapidly during the cycling process due to the decomposition of Li …

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Density Functional Theory Studies Of Surface-Enhanced Raman Spectroscopy In Electrochemical Interfaces, Liu-Bin Zhao, De-Yin Wu, Bin Ren, Zhong-Qun Tian Aug 2010

Density Functional Theory Studies Of Surface-Enhanced Raman Spectroscopy In Electrochemical Interfaces, Liu-Bin Zhao, De-Yin Wu, Bin Ren, Zhong-Qun Tian

Journal of Electrochemistry

Quantum chemical density functional theory and Raman scattering theory were used to study the bonding mechanism and surface-enhanced Raman spectroscopy of pyridine adsorbed on transition metals (Ⅷ group) and coinage metals (IB group) . SERS studies of pyridine-metal systems have been reviewed. Chemical bonding mechanism as well as photo-driven charge transfer mechanism was considered to investigate the vibrational frequency shift and the enhancement of SERS intensity in electrochemical interfaces. Our theoretical results can be used to interpret the SERS phenomena dependent on metals,excitation wavelengths,and applied potentials.

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Single And Multiobjective Approaches To Clustering With Point Symmetry., Sriparna Saha Dr. Aug 2010

Single And Multiobjective Approaches To Clustering With Point Symmetry., Sriparna Saha Dr.

Doctoral Theses

In our every day life, we make decisions consciously or unconsciously. This decision can be very simple such as selecting the color of dress or deciding the menu for lunch, or may be as difficult as those involved in designing a missile or in selecting a career. The former decision is easy to take, while the latter one might take several years due to the level of complexity involved in it. The main goal of most kinds of decision-making is to optimize one or more criteria in order to achieve the desired result. In other words, problems related to optimization …

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Comparative Study Of Nanoporous Pt, Ptru And Ptruir Catalysts Using Electrochemical Ftir Spectroscopy, M. Amussen Robert, Holt-Hindle Peter, Nigro Samantha, Aicheng Chen Aug 2010

Comparative Study Of Nanoporous Pt, Ptru And Ptruir Catalysts Using Electrochemical Ftir Spectroscopy, M. Amussen Robert, Holt-Hindle Peter, Nigro Samantha, Aicheng Chen

Journal of Electrochemistry

In recent years much effort has been put towards developing efficient Pt-based electrocatalysts for applications in fuel cells. With the rising cost of precious metals such as Pt,the need to enhance the activity and to decrease the load of catalysts is prominent. Herein we report on the synthesis and comparative study of nanoporous Pt,PtRu and PtRuIr electrocatalysts. The nanoporous electrodes were fabricated using a hydrothermal method and characterized by scanning electron microscopy (SEM) ,energy dispersive spectroscopy (EDS) ,X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) . The electrocatalytic activity of the fabricated nanopo- rous materials was evaluated using both CO …

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Electrochemical Surface-Enhanced Raman Spectroscopy—Current Status And Perspective, Bin Ren, Jian-Feng Li, Yi-Fan Huang, Zhi-Cong Zeng, Zhong-Qun Tian Aug 2010

Electrochemical Surface-Enhanced Raman Spectroscopy—Current Status And Perspective, Bin Ren, Jian-Feng Li, Yi-Fan Huang, Zhi-Cong Zeng, Zhong-Qun Tian

Journal of Electrochemistry

Electrochemical interface is a very important interface closely related to various energy and life processes. Surface-enhanced Raman scattering was widely used in electrochemistry soon after its discovery to understand the surface bonding,configuration,and orientation of the surface species. In recent 10 years,the fast development of nanoscience and nanotechnology has offered SERS with abundant substrates and characterization methods,which has allowed impressive development of electrochemical SERS. This articles will follow the time line to make systematically overview of SERS on Au and Ag,thin-layer transition-metal SERS,pure transition metal SERS,core-shell SERS and those methods for studying single crystal surfaces,including gap-mode SERS, TERS and SHINERS. Emphasis …

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Cannon-Thurston Maps And Relative Hyperbolicity., Abhijit Pal Dr. Aug 2010

Cannon-Thurston Maps And Relative Hyperbolicity., Abhijit Pal Dr.

Doctoral Theses

Let P : Y → T be a tree of strongly relatively hyperbolic spaces such that Y is also a strongly relatively hyperbolic space. Let X be a vertex space and i : X ֒→ Y denote the inclusion. The main aim of this thesis is to extend i to a continuous map i : X → Y , where X and Y are the Gromov compactifications of X and Y respectively. Such continuous extensions are called Cannon-Thurston maps. This is a generalization of [Mit98b] which proves the existence of Cannon-Thurston maps for X and Y hyperbolic. By generalizing a …

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The Mechanism Of 13CoAd/12Co Isotope Exchange At Pt Electrode,A Combined Study By Electrochemical In-Situ Infrared Spectroscopy And Dipole-Dipole Coupling Analysis, Sang-Zi Liang, Shao-Xiong Liu, Ling-Wen Liao, Qian Tao, Jing Kang, Yan-Xia Chen Aug 2010

The Mechanism Of 13CoAd/12Co Isotope Exchange At Pt Electrode,A Combined Study By Electrochemical In-Situ Infrared Spectroscopy And Dipole-Dipole Coupling Analysis, Sang-Zi Liang, Shao-Xiong Liu, Ling-Wen Liao, Qian Tao, Jing Kang, Yan-Xia Chen

Journal of Electrochemistry

In this contribution,we have analyzed the IR spectra of saturated CO adlayer at rough Pt film electrode as a function of fractional surface coverage of 13COad /12CO recorded during 13COad /12CO isotope exchange process according to dipole-dipole coupling theory and coherent potential approximation. By properly choosing the parameters of adlayer structure and dipole-dipole coupling interaction under coherent potential approximation, we demonstrated that we can successfully simulate the IR spectra as a function of the surface coverage of CO adlayer at rough Pt film electrodes by assuming that COad molecules with low …

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Phenomena Characterization Of Energy Materials By X-Ray Absorption Spectroscopy, Ming-Yao Cheng, Chun-Jen Pan, Ju-Hsiang Cheng, Bing-Joe Hwang Aug 2010

Phenomena Characterization Of Energy Materials By X-Ray Absorption Spectroscopy, Ming-Yao Cheng, Chun-Jen Pan, Ju-Hsiang Cheng, Bing-Joe Hwang

Journal of Electrochemistry

The aim of this review is to introduce the characterization of energy materials by X-ray absorption spectroscopy (XAS) . This technique allows us to probe changes in the valance state and the local environment of the targeted element in the active material; thereby,leading to a better understanding of its electrochemical behavior,and hopefully showing the way to improved performance. Here,electrocatalysts for fuel cells and active electrode materials for Li-ion batteries are taken as the examples that illustrate the capability of XAS and allow observation and theory to be correlated with electrochemical phenomena.

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In Situ Surface-Enhanced Raman Scattering Spectroscopic Study Of Sulfur Adsorption On Polycrystalline Platinum Electrode Surface, Bolian Xu, In-Su Park, Ying Li, De-Jun Chen, Yuye J. Tong Aug 2010

In Situ Surface-Enhanced Raman Scattering Spectroscopic Study Of Sulfur Adsorption On Polycrystalline Platinum Electrode Surface, Bolian Xu, In-Su Park, Ying Li, De-Jun Chen, Yuye J. Tong

Journal of Electrochemistry

The paper reports the first in situ surface enhanced Raman scattering (SERS) spectroelectrochemistry study of sulfur adsorption and electro-oxidation on highly roughened polycrystalline Pt surface in both acidic and basic supporting electrolytes. The SERS spectra were taken at a constant electrode potential after accumulative electro-oxidation CVs of the Pt electrode with pre-adsorbed sulfur species and at different electrode potentials that were varied stepwise of the Pt electrode immersed in sulfur-containing electrolytes without pre-adsorbed sulfur species. In both cases,a dominant vibrational band at 299 cm-1 in acidic electrolyte but at 310 cm-1 in basic electrolyte was observed,which was assigned …

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Studies Of Oxidation Processes Of Adsorbed And Solution Co On Pt(110) Electrode By Cyclic Voltammetry And In Situ Ftirs, Li Tian, Jun-Tao Li, Jin-Yu Ye, Chun-Hua Zhen, Shi-Gang Sun Aug 2010

Studies Of Oxidation Processes Of Adsorbed And Solution Co On Pt(110) Electrode By Cyclic Voltammetry And In Situ Ftirs, Li Tian, Jun-Tao Li, Jin-Yu Ye, Chun-Hua Zhen, Shi-Gang Sun

Journal of Electrochemistry

The oxidation processes of adsorbed CO (COad) and solution phase CO (COsol) on Pt(110) electrode were investigated by cyclic voltammetry and in-situ FTIR spectroscopy. It has revealed that in comparison with COad on Pt(110) in a CO-free solution,the oxidation current peak of COsol in a CO-saturated solution is positively shifted ca. 168 mV,and the peak current density has been increased by 6. 70 times. Linear adsorbed CO (COL) is determined by in-situ FTIR spectroscopy as the main species,which is uniformly distributed on Pt (110) surface. In a CO-free solution,the onset potential of COL is measured by in-situ FTIRS ca. 0. …

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Electrochemical Sers Studies On The Adsorption Of Benzoimidazole And Derivative In Nonaqueous Solution, Ya-Xian Yuan, Feng-Zhu Yang, Wei Liu, Ping-Jie Wei, Jian-Lin Yao, Ren-Ao Gu Aug 2010

Electrochemical Sers Studies On The Adsorption Of Benzoimidazole And Derivative In Nonaqueous Solution, Ya-Xian Yuan, Feng-Zhu Yang, Wei Liu, Ping-Jie Wei, Jian-Lin Yao, Ren-Ao Gu

Journal of Electrochemistry

The surface adsorption of benzoimidazole (BIMH) and 2-mercaptobenzimidazole(MBI) was investigated by electrochemical in-situ surface enhanced Raman spectroscopy (SERS) and direct electrochemical synthesis on Cu electrode. The influence of the neutral ligand of triphenylphosphine (pph3) on the adsorption and surface coordination of BIMH and MBI were investigated respectively. BIMH interacted with metal surface by the neutral molecule to form chemical adlayer in the extremely negative potential,while it adsorbed onto metal surface through the N atoms to form a polymer film which may suppress the corrosion of the metal. The introduction of pph3 destroyed the film formation of BIMH …

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A Framework For The Automatic Physical Configuration And Tuning Of A Mysql Community Server, Kevin Spillane Aug 2010

A Framework For The Automatic Physical Configuration And Tuning Of A Mysql Community Server, Kevin Spillane

Regis University Student Publications (comprehensive collection)

Manual physical configuration and tuning of database servers, is a complicated task requiring a high level of expertise. Database administrators must consider numerous possibilities, to determine a candidate configuration for implementation. In recent times database vendors have responded to this problem, providing solutions which can automatically configure and tune their products. Poor configuration choices, resulting in performance degradation commonplace in manual configurations, have been significantly reduced in these solutions. However, no such solution exists for MySQL Community Server. This thesis, proposes a novel framework for automatically tuning a MySQL Community Server. A first iteration of the framework has been built …

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Frataxin And Mitochondrial Fes Cluster Biogenesis, Timothy L. Stemmler, Emmanuel Lesuisse, Debumar Pain, Andrew Dancis Aug 2010

Frataxin And Mitochondrial Fes Cluster Biogenesis, Timothy L. Stemmler, Emmanuel Lesuisse, Debumar Pain, Andrew Dancis

Biochemistry and Molecular Biology Faculty Publications

Friedreich’s ataxia is an inherited neurodegenerative disease caused by frataxin deficiency. Frataxin is a conserved mitochondrial protein that plays a role in Fe-S cluster assembly in mitochondria. Fe-S clusters are modular cofactors that perform essential functions throughout the cell. They are synthesized by a multi-step and multi-subunit mitochondrial machinery that includes a scaffold protein Isu for assembling a protein bound Fe-S cluster intermediate. Frataxin interacts with Isu, iron, and with the cysteine desulfurase Nfs1 that supplies sulfur, thus placing it at the center of mitochondrial Fe-S cluster biosynthesis.

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Mechanochemistry Of Hexagonal Boron Nitride: 1. Destruction And Amorphization During Mechanical Treatment, A. N. Streletskii, D. G. Permenov, Kiril A. Streletzky, B. B. Bokhonov, A. V. Leonov Aug 2010

Mechanochemistry Of Hexagonal Boron Nitride: 1. Destruction And Amorphization During Mechanical Treatment, A. N. Streletskii, D. G. Permenov, Kiril A. Streletzky, B. B. Bokhonov, A. V. Leonov

Physics Faculty Publications

The regularities of the mechanical activation of hexagonal boron nitride are analyzed using the X-ray diffraction, IR spectroscopy, transmission electron microscopy, dynamic light scattering, and adsorption methods. At the initial state of mechanical activation, the main process is material destruction. At this stage, the specific surface area increases to 400 m2/g and crystallographically oriented nanosized needles are formed. At the same time, boron nitride crystal structure is disordered with an increase in interplanar distance d(002). The disordering is assumed to be due to a shift along planes (001). At a specific dose of supplied mechanical energy above 6–8 kJ/g, the …

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Sql Injection Attacks And Countermeasures: A Survey Of Website Development Practices, Evan Ryder Aug 2010

Sql Injection Attacks And Countermeasures: A Survey Of Website Development Practices, Evan Ryder

Regis University Student Publications (comprehensive collection)

This study involved the development and subsequent use of a bespoke SQL Injection vulnerability scanner to analyze a set of unique approaches to common tasks, identified by conducting interviews with developers of high-traffic Web sites. The vulnerability scanner was developed to address many recognized shortcomings in existing scanning software, principal among which were the requirements for a comprehensive yet lightweight solution, with which to quickly test targeted aspects of online applications; and a scriptable, Linux-based system. Emulations of each approach were built, using PHP and MySQL, which were then analyzed with the aid of the bespoke scanner. All discovered vulnerabilities …

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An Examination Of Online Learning Security Requirements Within A Virtual Learning Environment Of An Irish University, Caroline Horan Aug 2010

An Examination Of Online Learning Security Requirements Within A Virtual Learning Environment Of An Irish University, Caroline Horan

Regis University Student Publications (comprehensive collection)

As the adoption of e-learning and need for lifelong learning increases, it is vital the administrator of a virtual learning environment continually ensures reliable and secure data. This case study engaged in the initial steps of analyzing the use and security needs of a virtual learning service within a university of Ireland. The university provided two virtual learning services which were comparatively analyzed, from a security and data protection perspective. In addition, survey results obtained from the university user community for one of the e-learning services were examined. Findings from the study were presented as user security requirements and recommendations, …

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Simulations Of A Monolithic Lanthanum Bromide Gamma-Ray Detector, Camden Ertley, Chris Bancroft, Peter F. Bloser, Taylor Connor, Jason S. Legere, Mark L. Mcconnell, James M. Ryan Aug 2010

Simulations Of A Monolithic Lanthanum Bromide Gamma-Ray Detector, Camden Ertley, Chris Bancroft, Peter F. Bloser, Taylor Connor, Jason S. Legere, Mark L. Mcconnell, James M. Ryan

Space Science Center

We have been working on the development of a detector design for a large area coded aperture imaging system operating in the 10-600 keV energy range. The detector design is based on an array of Lanthanum Bromide (LaBr3) scintillators, each directly coupled to a Hamamatsu 64-channel multi-anode photomultiplier tube (MAPMT). This paper focuses on the development of the GEANT4-based simulations as an aid in the optimization of the detector design. The simulations have been validated by comparisons with various laboratory data sets. We will summarize the current status and latest findings from this study.

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Wanda B.: Weight And Activity With Blood Pressure Monitoring System For Heart Failure Patients, Myung Kyung Suh, Lorraine S. Evangelista, Victor Chen, Wen Sao Hong, Jamie Macbeth, Ani Nahapetian, Florence Joy Figueras, Majid Sarrafzadeh Aug 2010

Wanda B.: Weight And Activity With Blood Pressure Monitoring System For Heart Failure Patients, Myung Kyung Suh, Lorraine S. Evangelista, Victor Chen, Wen Sao Hong, Jamie Macbeth, Ani Nahapetian, Florence Joy Figueras, Majid Sarrafzadeh

Computer Science: Faculty Publications

Heart failure is a leading cause of death in the United States, with around 5 million Americans currently suffering from congestive heart failure. The WANDA B. wireless health technology leverages sensor technology and wireless communication to monitor heart failure patient activity and to provide tailored guidance. Patients who have cardiovascular system disorders can measure their weight, blood pressure, activity levels, and other vital signs in a real-time automated fashion. The system was developed in conjunction with the UCLA Nursing School and the UCLA Wireless Health Institute for use on actual patients. It is currently in use with real patients in …

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Connect - December 2008 Aug 2010

Connect - December 2008

Connect

Click the DOWNLOAD button to access this issue of Connect.

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2010-08-26 Unm News Minute, University Of New Mexico Communication And Marketing Department Aug 2010

2010-08-26 Unm News Minute, University Of New Mexico Communication And Marketing Department

UNM News Minute 2010

No abstract provided.

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Mathematics Professors Receive Nsf Grants, Jim Bakken Aug 2010

Mathematics Professors Receive Nsf Grants, Jim Bakken

Browse All News

No abstract provided.

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Genetic Diversity And Distribution Of Selected Freshwater Mollusks (Gastropoda And Bivalvia) From West Of The Mississippi River With An Emphasis On Arkansas Taxa, David Michael Hayes Aug 2010

Genetic Diversity And Distribution Of Selected Freshwater Mollusks (Gastropoda And Bivalvia) From West Of The Mississippi River With An Emphasis On Arkansas Taxa, David Michael Hayes

Student Theses and Dissertations

Freshwater mollusks represent one of the most imperiled groups in North America. Basic information reguarding distribution, species limits, and evolutionary relationships is lacking. In an effort to fill in data gaps reguarding diversity and distribution of freshwater mollusks, particularly west of the Mississippi River, I identified two main objectives. The first objective was to examine two taxonomically challenging groups (Pleuroceridae:Gastropoda and Unionidae:Pleurobemini) using molecular phylogenetics. The goal of this work was to provide a molecular hypothesis to aid in sorting out phenotypic plasticity and cryptic diversity. The second objective was to conduct a survey of freshwater gastropods from the Interior …

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I, Development Of The In Situ Reductive Ozonolysis Of Alkenes With Tertiary Amine N-Oxides. Ii, Progress Toward The Asymmetric Synthesis Of Peroxyplakoric Acid A3, Christopher P. Schwartz Aug 2010

I, Development Of The In Situ Reductive Ozonolysis Of Alkenes With Tertiary Amine N-Oxides. Ii, Progress Toward The Asymmetric Synthesis Of Peroxyplakoric Acid A3, Christopher P. Schwartz

Department of Chemistry: Dissertations, Theses, and Student Research

Ozone, first discovered in the mid 1800’s, is a triatomic allotrope of oxygen that is a powerful oxidant. For over a century, research has been conducted into the synthetic application and mechanism of reactions of ozone with organic compounds. One of the major areas of interest has been the ozonolysis of alkenes. The production of carbonyl compounds is the most common synthetic application of ozonolysis. The generally accepted mechanism developed by Rudolf Criegee for this reaction involves the 1,3-electrocyclic addition of ozone to the π bond of the alkene to form a 1,2,3-trioxolane or primary ozonide. The primary ozonide is …

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The Economic Impact Of Oaklawn Hospital On The Marshall Area, George A. Erickcek, Brad R. Watts Aug 2010

The Economic Impact Of Oaklawn Hospital On The Marshall Area, George A. Erickcek, Brad R. Watts

Reports

No abstract provided.

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On The Transit Potential Of The Planet Orbiting Iota Draconis, Stephen R. Kane, Sabine Reffert, Gregory W. Henry, Debra A. Fischer, Christian Schwab, Kelsey I. Clubb, Christoph Bergmann Aug 2010

On The Transit Potential Of The Planet Orbiting Iota Draconis, Stephen R. Kane, Sabine Reffert, Gregory W. Henry, Debra A. Fischer, Christian Schwab, Kelsey I. Clubb, Christoph Bergmann

Information Systems and Engineering Management Research Publications

Most of the known transiting exoplanets are in short-period orbits, largely due to the bias inherent in detecting planets through the transit technique. However, the eccentricity distribution of the known radial velocity planets results in many of those planets having a non-negligible transit probability. One such case is the massive planet orbiting the giant star iota Draconis, a situation where both the orientation of the planet's eccentric orbit and the size of the host star inflate the transit probability to a much higher value than for a typical hot Jupiter. Here we present a revised fit of the radial velocity …

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Layered Security Solutions Over Dependency Within Any Layer, Olga H. Brandt Aug 2010

Layered Security Solutions Over Dependency Within Any Layer, Olga H. Brandt

Regis University Student Publications (comprehensive collection)

Considering the advancement of computer systems and security solutions available in today's constantly changing world, there are various philosophies as to what is required (or adequate) in order to protect a system. This investigative study proposed to explore a possible problem with employing a layered security solution\ over dependence or reliance on any layer. A risk analysis was performed to determine where over dependence or reliance could happen and what could be done to prevent this. Various reviews and other findings online were researched and the data compiled using a qualitative methodology. Lastly, a recommendation is made on what is …

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We Are...Marshall, August 25, 2010, Office Of Marshall University Communications Aug 2010

We Are...Marshall, August 25, 2010, Office Of Marshall University Communications

We Are ... Marshall: the Newsletter for Marshall University 1999-2023

No abstract provided.

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Sipa Trustee's Preliminary Investigative Report And Recommendations, James W. Giddens Aug 2010

Sipa Trustee's Preliminary Investigative Report And Recommendations, James W. Giddens

Documents

Trustee's Preliminary Investigation Report and Recommendations

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Construction Cost Models, Barry Dikeman Aug 2010

Construction Cost Models, Barry Dikeman

Economics and Finance

The following are a series of cost estimate models similar in format to a typical engineer’s estimate that were developed in support of our financial impact assessment report for LD 1725. The models us current material costs, labor costs, and equipment costs for the region to provide a comparative cost analysis of seven culvert replacement scenarios. The models provide information about what the cost impact of LD 1725 would be for typical culvert replacements in Maine. However, due to the inherent restrictions of the cost modeling framework we were not able to include the abundance of variables that would be …

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