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2011

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Articles 10201 - 10230 of 10326

Full-Text Articles in Physical Sciences and Mathematics

A Mild Method For The Deprotection Of Tetrahydropyranyl (Thp) Ethers Catalyzed By Iron(Iii) Tosylate, Ram Mohan, Matthew Bockman, Veronica Angeles, Julia Martino, Purav Vagadia Dec 2010

A Mild Method For The Deprotection Of Tetrahydropyranyl (Thp) Ethers Catalyzed By Iron(Iii) Tosylate, Ram Mohan, Matthew Bockman, Veronica Angeles, Julia Martino, Purav Vagadia

Ram S. Mohan

A mild method for the deprotection of THP ethers catalyzed by iron(III) tosylate (2.0 mol %) in CH3OH has been developed. Iron(III) tosylate, Fe(OTs)3.6H2O, is a commercially available solid that is inexpensive, noncorrosive, and easy to handle. The room temperature reaction conditions make this method attractive for deprotection of a range of THP ethers.

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Introduction To Life Data Analysis, Caroline Lubert, C. Lange Dec 2010

Introduction To Life Data Analysis, Caroline Lubert, C. Lange

Caroline P Lubert

No abstract provided.

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Reorientational Versus Kerr Dark And Gray Solitary Waves Using Modulation Theory, Prof. Tim Marchant Dec 2010

Reorientational Versus Kerr Dark And Gray Solitary Waves Using Modulation Theory, Prof. Tim Marchant

Tim Marchant

We develop a modulation theory model based on a Lagrangian formulation to investigate the evolution of dark and gray optical spatial solitary waves for both the defocusing nonlinear Schrodinger (NLS) equation and the nematicon equations describing nonlinear beams, nematicons, in self-defocusing nematic liquid crystals. Since it has an exact soliton solution, the defocusing NLS equation is used as a test bed for the modulation theory applied to the nematicon equations, which have no exact solitary wave solution. We find that the evolution of dark and gray NLS solitons, as well as nematicons, is entirely driven by the emission of diffractive …

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Bifurcation And Invariant Manifolds Of The Ricker Competition Model, Saber Elaydi Dec 2010

Bifurcation And Invariant Manifolds Of The Ricker Competition Model, Saber Elaydi

Saber Elaydi

We study the stability and bifurcation of all equilibrium points, including extinction, exclusion, and coexistence points. Stable , unsgtable are computed. Moreover, for the nonhyperbolic cases, we computed the center manifolds and determine their stability or lack of it thereof.

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Generalized Zeta Functions, Tian-Xiao He Dec 2010

Generalized Zeta Functions, Tian-Xiao He

Tian-Xiao He

We present here a wide class of generalized zeta function in terms of the generalized Mobius functions and its properties.

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Heterogeneity Of Reaction Rates In An Ionic Liquid: Quantitative Results From 2d- Muppets, Kalyanasis Sahu, Sean Kern, Mark Berg Dec 2010

Heterogeneity Of Reaction Rates In An Ionic Liquid: Quantitative Results From 2d- Muppets, Kalyanasis Sahu, Sean Kern, Mark Berg

Sean J. Kern

The hypotheses that ionic liquids are structurally heterogeneous at the molecular level and, even further, that this heterogeneity can transfer to the rates of reactions run in ionic liquids is being actively debated. Here, this hypothesis is tested using multiple population-period transient spectroscopy (MUPPETS), an emerging type of multidimensional measurement that resolves the kinetics of subensembles within a heterogeneous sample. A previous MUPPETS study of the excited-state twisting and electronic relaxation of auramine indicated that an ionic-liquid solvent induces rate dispersion due to a combination of heterogeneous and homogeneous processes, but those data could not quantitatively separate these contributions [Khurmi, …

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Checking The Feasibility Of Dial-A-Ride Instances Using Constraint Programming, Gerardo Berbeglia, Gilles Pesant, Louis-Martin Rousseau Dec 2010

Checking The Feasibility Of Dial-A-Ride Instances Using Constraint Programming, Gerardo Berbeglia, Gilles Pesant, Louis-Martin Rousseau

Gerardo Berbeglia

No abstract provided.

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Accurately Sized Test Statistics With Misspecified Conditional Homoskedasticity, Douglas Steigerwald, Jack Erb Dec 2010

Accurately Sized Test Statistics With Misspecified Conditional Homoskedasticity, Douglas Steigerwald, Jack Erb

Douglas G. Steigerwald

We study the finite-sample performance of test statistics in linear regression models where the error dependence is of unknown form. With an unknown dependence structure there is traditionally a trade-off between the maximum lag over which the correlation is estimated (the bandwidth) and the amount of heterogeneity in the process. When allowing for heterogeneity, through conditional heteroskedasticity, the correlation at far lags is generally omitted and the resultant inflation of the empirical size of test statistics has long been recognized. To allow for correlation at far lags we study test statistics constructed under the possibly misspecified assumption of conditional homoskedasticity. …

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Energy Efficiency And Conservation: New Legal Tools And Opportunities, John Dernbach, Robert Mckinstry, Darin Lowder Dec 2010

Energy Efficiency And Conservation: New Legal Tools And Opportunities, John Dernbach, Robert Mckinstry, Darin Lowder

John C. Dernbach

Many new and ambitious energy efficiency and conservation laws are being enacted at all levels of government—and with greater financial incentives than provided previously. These innovations are intended to overcome or minimize market barriers such as principal-agent problems, information and transaction costs, high internal discount rates, and up-front capital needs that discourage cost-saving investments. Innovations such as public-private partnerships also require significant legal input and creativity for the client to reap the often remarkably large energy and cost savings. This article reviews a range of these tools, especially financial legal mechanisms, that could help significantly reduce U.S. energy consumption.

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Applying Semantic Segment Detection To Enhance Web Page Presentation On The Mobile Internet, Stephen Yang, Jia Zhang, Stella Tsai, Jeff Huang Dec 2010

Applying Semantic Segment Detection To Enhance Web Page Presentation On The Mobile Internet, Stephen Yang, Jia Zhang, Stella Tsai, Jeff Huang

Jia Zhang

No abstract provided.

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The Underground Economy Of Fake Antivirus Software, Douglas Steigerwald, Brett Stone-Gross, Ryan Abman, Richard Kemmerer, Christopher Kruegel, Giovanni Vigna Dec 2010

The Underground Economy Of Fake Antivirus Software, Douglas Steigerwald, Brett Stone-Gross, Ryan Abman, Richard Kemmerer, Christopher Kruegel, Giovanni Vigna

Douglas G. Steigerwald

Fake antivirus (AV) programs have been utilized to defraud millions of computer users into paying as much as one hundred dollars for a phony software license. As a result, fake AV software has evolved into one of the most lucrative criminal operations on the Internet. In this paper, we examine the operations of three large-scale fake AV businesses, lasting from three months to more than two years. More precisely, we present the results of our analysis on a trove of data obtained from several backend servers that the cybercriminals used to drive their scam operations. Our investigations reveal that these …

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Applying A Marginalized Frailty Model To Competing Risks, Stephanie Dixon, G. Darlington, V. Edge Dec 2010

Applying A Marginalized Frailty Model To Competing Risks, Stephanie Dixon, G. Darlington, V. Edge

Stephanie Dixon

No abstract provided.

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Declining Atmospheric Co2 During The Late Middle Eocene Climate Transition, Gabriela Doria, Dana Royer, Alexander Wolfe, Andrew Fox, J. Westgate, David Beerling Dec 2010

Declining Atmospheric Co2 During The Late Middle Eocene Climate Transition, Gabriela Doria, Dana Royer, Alexander Wolfe, Andrew Fox, J. Westgate, David Beerling

Gabriela Doria

No abstract provided.

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Efficient Water Conservation In Agriculture For Growing Urban Water Demands In Jordan, Raed Al-Tabini, A.R. Octavio, A,W. Frank, R. Phillips Dec 2010

Efficient Water Conservation In Agriculture For Growing Urban Water Demands In Jordan, Raed Al-Tabini, A.R. Octavio, A,W. Frank, R. Phillips

Raed Al-Tabini

A significant challenge worldwide is to increase food supply to accommodate a population growing to 10 billion in the face of climate change. Per capita water supply in Jordan is among the world’s lowest. Despite this scarcity, three quarters of Jordan’s water use is consumed by irrigated agriculture, while producing low economic values at the margin compared to urban uses. However, irrigated agriculture supports Jordan’s food security, so its policymakers continue to examine measures to produce more crop‐per‐drop in irrigated agriculture to permit scarce water to meet growing urban demands. This paper examines economically efficient measures to conserve water in …

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Wp:Clubhouse? An Exploration Of Wikipedia's Gender Imbalance, S. Lam, A. Uduwage, Shilad Sen, D. Musicant, L. Terveen, J. Riedl Dec 2010

Wp:Clubhouse? An Exploration Of Wikipedia's Gender Imbalance, S. Lam, A. Uduwage, Shilad Sen, D. Musicant, L. Terveen, J. Riedl

Shilad Sen

No abstract provided.

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Navigating The Tag Genome, J. Vig, Shilad Sen, J. Riedl Dec 2010

Navigating The Tag Genome, J. Vig, Shilad Sen, J. Riedl

Shilad Sen

No abstract provided.

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Properties For Component Model: The Definition Perspective, Siti Salwah Salim Dec 2010

Properties For Component Model: The Definition Perspective, Siti Salwah Salim

Siti Salwah Salim Prof. Dr.

The presence of a large number of component models to date should be able to offer software developers a wide variety of component models - which they can easily choose from - for their software development projects. However, the opposite situation is currently observed, where the presence of many component models has caused difficulties in making the selection. Lack of properties or characteristics that can be used as a basis to perform objective comparison between the existing models is believed to have caused the difficulties. In this paper, a list of component model properties is derived by thoroughly examining the …

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Race And Human Diversity: A Biocultural Approach, Robert Anemone Dec 2010

Race And Human Diversity: A Biocultural Approach, Robert Anemone

Robert L. Anemone

No abstract provided.

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Complete Graphs Whose Topological Symmetry Groups Are Polyhedral, Ramin Naimi, Erica Flapan, Blake Mellor Dec 2010

Complete Graphs Whose Topological Symmetry Groups Are Polyhedral, Ramin Naimi, Erica Flapan, Blake Mellor

Ramin Naimi

We determine for which $m$, the complete graph $K_m$ has an embedding in $S^3$ whose topological symmetry group is isomorphic to one of the polyhedral groups: $A_4$, $A_5$, or $S_4$.

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Macademia: Semantic Visualization Of Research Interests, Shilad Sen, H. Charlton, R. Kerwin, J. Lim, B. Maus, N. Miller, M. Naminski, A. Scheenman, A. Tran, E. Nunes, E. Sparling Dec 2010

Macademia: Semantic Visualization Of Research Interests, Shilad Sen, H. Charlton, R. Kerwin, J. Lim, B. Maus, N. Miller, M. Naminski, A. Scheenman, A. Tran, E. Nunes, E. Sparling

Shilad Sen

No abstract provided.

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A Competing Risk Model For Correlated Data Based On The Subdistribution Hazard, Stephanie Dixon, G. Darlington, A. Desmond Dec 2010

A Competing Risk Model For Correlated Data Based On The Subdistribution Hazard, Stephanie Dixon, G. Darlington, A. Desmond

Stephanie Dixon

No abstract provided.

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Performance Enhancement In Organic Photovoltaic Devices Using Plasma-Polymerized Fluorocarbon-Modified Ag Nanoparticles, Xz Wang, Jw Ho, Qy Yang, Hl Tam, Gx Li, Kw Cheah, F.R. Zhu Dec 2010

Performance Enhancement In Organic Photovoltaic Devices Using Plasma-Polymerized Fluorocarbon-Modified Ag Nanoparticles, Xz Wang, Jw Ho, Qy Yang, Hl Tam, Gx Li, Kw Cheah, F.R. Zhu

Professor ZHU, Fu Rong

In this work, Ag nanoparticles were modified by an ultra-thin plasma-polymerized fluorocarbon film (CFX) to form a composite CFX -modified Ag nanoparticles/indium tin oxide (ITO) anode for application in organic photovoltaic (OPV) devices. A CFX-modified Ag nanoparticles/ITO anode exhibited a superior surface work function of 5.4 eV suited for application in OPV devices. The device performance of zinc phthalocyanine:fullerene-based OPV devices showed a significant improvement when the structural identical cells are made with the CFX-modified Ag nanoparticles/ITO. This work yielded a promising power conversion efficiency of 3.50.1%, notably higher than that with a bare ITO anode (2.70.1%).

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Modules In Community: Injecting More Parallelism Into Computer Science Curricula, Elizabeth Shoop, Richard Brown Dec 2010

Modules In Community: Injecting More Parallelism Into Computer Science Curricula, Elizabeth Shoop, Richard Brown

Elizabeth Shoop

No abstract provided.

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Quantitative Characterization Of Glacier State And Dynamics In South Asia And Validation In Alaska Using Repeat Aster Multispectral And Terrain Information., Umesh Haritashya Dec 2010

Quantitative Characterization Of Glacier State And Dynamics In South Asia And Validation In Alaska Using Repeat Aster Multispectral And Terrain Information., Umesh Haritashya

Umesh Haritashya

National Aeronautics and Space Administration (NASA). Total Amount $682,808. Role: Collaborator. Project duration: January 1, 2011 – December 31, 2013.

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An Autoregressive Approach To House Price Modeling, Chaitra Nagaraja, Lawrence Brown, Linda Zhao Dec 2010

An Autoregressive Approach To House Price Modeling, Chaitra Nagaraja, Lawrence Brown, Linda Zhao

Chaitra H Nagaraja

No abstract provided.

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Estimating The Timing Of Cave Level Development With Gis, Brianne Jacoby, Eric Peterson, Toby Dogwiler, John Kostelnicj Dec 2010

Estimating The Timing Of Cave Level Development With Gis, Brianne Jacoby, Eric Peterson, Toby Dogwiler, John Kostelnicj

Eric Wade Peterson

Identifying cave levels provides insight into cave development and climatic changes that have affected a karst system over time. Cosmogenic dating has been used to interpret levels in Mammoth Cave and the Cumberland Plateau. This absolute dating technique has proven successful in determining cave paleoclimates and regional geomorphic history, but is expensive. The study presented here is a preliminary method to cosmogenic dating that can outline a region’s speleogenesis using a Geographic Information System (GIS) and published denudation rates. The Carter Cave system in northeastern Kentucky is within the karst landscape found along the western edge of the Appalachians and …

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Space Weather And Technological Impacts, Jennifer Meehan, G. Fisher, W. Murtagh Dec 2010

Space Weather And Technological Impacts, Jennifer Meehan, G. Fisher, W. Murtagh

Jennifer (Jinni) Meehan

No abstract provided.

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Highly Photoactive Titanyl Phthalocyanine Polymorphs As Textured Donor Layers In Organic Solar Cells, Diogenes Placencia, Weining Wang, Jeremy Gantz, Judith Jenkins, Neal Armstrong Dec 2010

Highly Photoactive Titanyl Phthalocyanine Polymorphs As Textured Donor Layers In Organic Solar Cells, Diogenes Placencia, Weining Wang, Jeremy Gantz, Judith Jenkins, Neal Armstrong

Weining Wang, Ph.D.

No abstract provided.

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Measuring Aeolian Saltation: A Comparison Of Sensors, Douglas Sherman, Bailiang Li, Eugene Farrell, Jean Ellis, Walter Cox, Luis Maia, Paulo Sousa Dec 2010

Measuring Aeolian Saltation: A Comparison Of Sensors, Douglas Sherman, Bailiang Li, Eugene Farrell, Jean Ellis, Walter Cox, Luis Maia, Paulo Sousa

Jean Taylor Ellis

No abstract provided.

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Business Ethics As Rational Choice, John Hooker Dec 2010

Business Ethics As Rational Choice, John Hooker

John Hooker

No abstract provided.

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