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2010

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Articles 2551 - 2580 of 8620

Full-Text Articles in Physical Sciences and Mathematics

Observation Of The First Bs--> J/Psi Phi Event In Cms, Stefan M Spanier, Giordano Cerizza Jul 2010

Observation Of The First Bs--> J/Psi Phi Event In Cms, Stefan M Spanier, Giordano Cerizza

Physics and Astronomy Publications and Other Works

Presentation for the International Conference on High Energy Physics, July 2010, Paris, France. The first reconstructed decay of a Bs particle in CMS that is relevant for finding information to explain the matter anti-matter asymmetry in the Universe.

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Remote Estimation Of Gross Primary Production In Maize, Yi Peng, Anatoly A. Gitelson, Galina Keydan, Donald C. Rundquist, Bryan Leavitt, Shashi B. Verma, Andrew E. Suyker Jul 2010

Remote Estimation Of Gross Primary Production In Maize, Yi Peng, Anatoly A. Gitelson, Galina Keydan, Donald C. Rundquist, Bryan Leavitt, Shashi B. Verma, Andrew E. Suyker

School of Natural Resources: Faculty Publications

There is a growing interest in the estimation of gross primary productivity (GPP) in crops due to its importance in regional and global studies of carbon balance. We have found that crop GPP was closely related to its total chlorophyll content, and thus chlorophyll can be used as a proxy of GPP in crops. In this study, we tested the performance of various vegetation indices for estimating GPP. The indices were derived from spectral data collected remotely but at close-range over a period of eight years, from 2001 through 2008. The results show that chlorophyll indices, based on near infrared …

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A Sea Change In Eta Carinae, Andrea Mehner, Kris Davidson, Roberta M. Humphreys, John C. Martin, Kazunori Ishibashi, Gary J. Ferland, Nolan R. Walborn Jul 2010

A Sea Change In Eta Carinae, Andrea Mehner, Kris Davidson, Roberta M. Humphreys, John C. Martin, Kazunori Ishibashi, Gary J. Ferland, Nolan R. Walborn

Physics and Astronomy Faculty Publications

Major stellar-wind emission features in the spectrum of η Car have recently decreased by factors of order 2 relative to the continuum. This is unprecedented in the modern observational record. The simplest, but unproven, explanation is a rapid decrease in the wind density.

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Sfa Weather Station-July 2010, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University Jul 2010

Sfa Weather Station-July 2010, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University

Weather Station Data

No abstract provided.

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The Akamai Network: A Platform For High-Performance Internet Applications, Erik Nygren, Ramesh Sitaraman, Jennifer Sun Jul 2010

The Akamai Network: A Platform For High-Performance Internet Applications, Erik Nygren, Ramesh Sitaraman, Jennifer Sun

Ramesh Sitaraman

Comprising more than 61,000 servers located across nearly 1,000 networks in 70 countries worldwide, the Akamai platform delivers hundreds of billions of Internet interactions daily, helping thousands of enterprises boost the performance and reliability of their Internet applications. In this paper, we give an overview of the components and capabilities of this large-scale distributed computing platform, and offer some insight into its architecture, design principles, operation, and management.

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Using Clustering For Modeling Monthly Salary Grade, R. W. Hndoosh Jul 2010

Using Clustering For Modeling Monthly Salary Grade, R. W. Hndoosh

R. W. Hndoosh

Clustering is considered as one of the most scientifically developments which the scientists reached at in the field of recent knowledge and technologies to discover the cluster's group. The clustering concept was introduced firstly by Ronald in 1955. The clustering's fundamental notion is represented in dividing the data into clusters. This research aims to using clustering for actual data modeling for the monthly salary grade of the teaching staff for one of the Mosul University's College in 2009, by using HCM algorithm to these data. Matlab software is used to write down the proposed algorithm programs. Results proved the efficiency …

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Optimal Control Of A Switched System In Microbial Fed-Batch Fermentation Process, Chongyang Liu, Zhaohua Gong, Enmin Feng Jul 2010

Optimal Control Of A Switched System In Microbial Fed-Batch Fermentation Process, Chongyang Liu, Zhaohua Gong, Enmin Feng

Chongyang Liu

The main control goal in fed-batch fermentation process is to get a high concentration of production. In this paper, by taking the feed rate of glycerol as the control function, a nonlinear switched system is proposed to formulate the fed-batch fermentation process of glycerol to 1,3-propanediol (1,3-PD). To maximize the concentration of 1,3-PD at the terminal time, an optimal switching control model subject to constraints of continuous state inequality and control function is presented. A computational approach is developed to seek the optimal solution in two aspects. On the one hand, the control parametrization enhancing transform together with the control …

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Structural, Magnetic, And Defect Properties Of Co-Pt-Type Magnetic-Storage Alloys: Density-Functional Theory Study Of Thermal Processing Effects, Aftab Alam, Brent Kraczek, Duane D. Johnson Jul 2010

Structural, Magnetic, And Defect Properties Of Co-Pt-Type Magnetic-Storage Alloys: Density-Functional Theory Study Of Thermal Processing Effects, Aftab Alam, Brent Kraczek, Duane D. Johnson

Duane D. Johnson

Using an optimized-basis Korringa-Kohn-Rostoker-coherent-potential approximation method, we calculate formation enthalpies ΔEf, structural, and magnetic properties of paramagnetic (PM) and ferromagnetic, disordered A1 and ordered L10 CoPt, FePd, and FePt systems that are of interest for high-density magnetic-recording media. To address processing effects, we focus on the point defects that dictate thermal properties and planar defects (e.g., c domain and antiphase boundaries) which can serve as pinning centers for magnetic domains and affect storage properties. We determine bulk Curie (Tc) and order-disorder (To-d) transition temperatures within 4% of observed values, and estimates for nanoparticles. Planar-defect energies γhklx show that the favorable …

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Ground-Penetrating-Radar Reflection Attenuation Tomography With An Adaptive Mesh, Emily A. Hinz, John H. Bradford Jul 2010

Ground-Penetrating-Radar Reflection Attenuation Tomography With An Adaptive Mesh, Emily A. Hinz, John H. Bradford

CGISS Publications and Presentations

Ground-penetrating radar (GPR) attenuation-difference analysis can be a useful tool for studying fluid transport in the subsurface. Surface-based reflection attenuation-difference tomography poses a number of challenges that are not faced by crosshole attenuation surveys. We create and analyze a synthetic attenuation-difference GPR data set to determine methods for processing amplitude changes and inverting for conductivity differences from reflection data sets. Instead of using a traditional grid-based inversion, we use a data-driven adaptive-meshing algorithm to alter the model space and to create amore even distribution of resolution. Adaptive meshing provides a method for improving the resolution of the model space while …

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Further Developments On The Geothermal System Scoping Model, Mark Antkowiak, Rosemary Sargent, Jesse W. Geiger Jul 2010

Further Developments On The Geothermal System Scoping Model, Mark Antkowiak, Rosemary Sargent, Jesse W. Geiger

Publications (E)

The fields of well construction and engineering, power plant construction and engineering, and reservoir engineering often proceed independently of one another. Yet the subsystems of a geothermal plant with which each of these fields is concerned need to be integrated in order to create a viable geothermal power system and make enhanced (or engineered) geothermal systems (EGS) a technical and an economic reality. Furthermore, each of these subsystems need to be examined in the context of the overall power system to aid with plant construction, and–more salient to the U.S. Department of Energy–to help determine best investment of research dollars. …

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Survey Of Resource Managers Completed On Monitoring And Management Actions For Rare Plants In Arizona And Nevada, Scott R. Abella Jul 2010

Survey Of Resource Managers Completed On Monitoring And Management Actions For Rare Plants In Arizona And Nevada, Scott R. Abella

Public Policy and Leadership Faculty Publications

In a collaborative project with Northern Arizona University and more than 35 resource managers in Arizona and Nevada, we completed a survey of monitoring and management activities that are ongoing in these states for conserving populations of rare plants. We sent questionnaires consisting of 16 questions to as many resource managers as possible in these states and had follow-up conversations with several managers willing to share their perspective on ongoing conservation actions. The findings may be interesting for managers to see what issues and management strategies other managers in the same or different regions are grappling with. Results will be …

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Modeling, Preparation, And Characterization Of A Dipole Moment Switch Driven By Z/E Photoisomerization, Alfonso Melloni, Riccardo Rossi Paccani, Donato Donati, Vinicio Zanirato, Adalgisa Sinicropi, Maria Laura Parisi, Elena Martin, Mikhail Ryazantsev, Wan Jian Ding, Luis Manuel Frutos, Riccardo Basosi, Stefania Fusi, Loredana Latterini, Nicolas Ferre, Massimo Olivucci Jul 2010

Modeling, Preparation, And Characterization Of A Dipole Moment Switch Driven By Z/E Photoisomerization, Alfonso Melloni, Riccardo Rossi Paccani, Donato Donati, Vinicio Zanirato, Adalgisa Sinicropi, Maria Laura Parisi, Elena Martin, Mikhail Ryazantsev, Wan Jian Ding, Luis Manuel Frutos, Riccardo Basosi, Stefania Fusi, Loredana Latterini, Nicolas Ferre, Massimo Olivucci

Chemistry Faculty Publications

We report the results of a multidisciplinary research effort where the methods of computational photochemistry and retrosynthetic analysis/synthesis have contributed to the preparation of a novel N-alkylated indanylidene-pyrroline Schiff base featuring an exocyclic double bond and a permanent zwitterionic head. We show that, due to its large dipole moment and efficient photoisomerization, such a system may constitute the prototype of a novel generation of electrostatic switches achieving a reversible light-induced dipole moment change on the order of 30 D. The modeling of a peptide fragment incorporating the zwitterionic head into a conformationally rigid side chain shows that the switch can …

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Population Models With Allee Effect: A New Model, Saber Elaydi, Robert J. Sacker Jul 2010

Population Models With Allee Effect: A New Model, Saber Elaydi, Robert J. Sacker

Mathematics Faculty Research

In this paper we develop several mathematical models of Allee effects. We start by defining the Allee effect as a phenomenon in which individual fitness increases with increasing density. Based on this biological assumption, we develop several fitness functions that produce corresponding models with Allee effects. In particular, a rational fitness function yields a new mathematical model that is our focus of study. Then we study the dynamics of 2-periodic systems with Allee effects and show the existence of an asymptotically stable 2-periodic carrying capacity.

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Quest: Quantum Electron Simulation Toolbox, C.-R. Lee, S. Chiesa, C. Varney, Ehsan Khatami, Z. Bai, E. D'Azevedo, M. Jarrell, Th. Maier, S. Savrasov, R. Scalettar, K. Tomko Jul 2010

Quest: Quantum Electron Simulation Toolbox, C.-R. Lee, S. Chiesa, C. Varney, Ehsan Khatami, Z. Bai, E. D'Azevedo, M. Jarrell, Th. Maier, S. Savrasov, R. Scalettar, K. Tomko

Faculty Publications

QUEST is a part of the SciDAC project on next generation multi-scale quantum simulation software for strongly correlated materials. It is a Fortran 90/95 package that implements the determinant quantum Monte Carlo (DQMC) method for simulation of magnetic, superconducting, and metal-insulator transitions in model Hamiltonians. In this paper, we show how QUEST is capable of treating lattices of unprecedentedly large sizes and how this can be fruitful in the study of the physics of trapped fermionic system, in the development of more efficient solvers for Dynamical Mean Field Theory (DMFT) and as a tool to test and, in the future, …

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Extension Of Plurisubharmonic Functions With Growth Control, Dan Coman, Vincent Guedj, Ahmed Zeriahi Jul 2010

Extension Of Plurisubharmonic Functions With Growth Control, Dan Coman, Vincent Guedj, Ahmed Zeriahi

Mathematics - All Scholarship

Suppose that X is an analytic subvariety of a Stein manifold M and that varphi is a plurisubharmonic (psh) function on X which is dominated by a continuous psh exhaustion function u of M. Given any number c > 1, we show that varphi admits a psh extension to M which is dominated by cu on M. We use this result to prove that any omega-psh function on a subvariety of the complex projective space is the restriction of a global omega-psh function, where omega is the Fubini-Study Kahler form.

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Summer 2010 Research Symposium Abstract Book, Trinity College Jul 2010

Summer 2010 Research Symposium Abstract Book, Trinity College

Science Symposia Abstracts

Summer 2010 volume of abstracts for science research projects conducted by Trinity College students.

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10302 Summary - Learning Paradigms In Dynamic Environments, Barbara Hammer, Pascal Hitzler Jul 2010

10302 Summary - Learning Paradigms In Dynamic Environments, Barbara Hammer, Pascal Hitzler

Computer Science and Engineering Faculty Publications

The seminar centered around problems which arise in the context of machine learning in dynamic environments. Particular emphasis was put on a couple of specific questions in this context: how to represent and abstract knowledge appropriately to shape the problem of learning in a partially unknown and complex environment and how to combine statistical inference and abstract symbolic representations; how to infer from few data and how to deal with non i.i.d. data, model revision and life-long learning; how to come up with efficient strategies to control realistic environments for which exploration is costly, the dimensionality is high and data …

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Cs 205: Introduction To Computers And Office Productivity Software, Terri Bauer Jul 2010

Cs 205: Introduction To Computers And Office Productivity Software, Terri Bauer

Computer Science & Engineering Syllabi

Focus on learning MS Office software applications including intermediate word processing, spreadsheets, database and presentation graphics using a case study approach where critical thinking and problem solving skills are required. Computer concepts are integrated throughout the course to provide an understanding of the basics of computing, the latest technological advances and how they are used in industry. Ethics and issues encountered in business are discussed to challenge students on societal impact of technology.

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Cs 480/680: Comparative Programming Languages, Michael L. Raymer Jul 2010

Cs 480/680: Comparative Programming Languages, Michael L. Raymer

Computer Science & Engineering Syllabi

No abstract provided.

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Cs 240: Computer Programming I, Travis E. Doom Jul 2010

Cs 240: Computer Programming I, Travis E. Doom

Computer Science & Engineering Syllabi

Basic concepts of programming and programming languages are introduced. Emphasis is on structured programming and stepwise refinement. Prerequisite: MTH 130 or MPL 5.

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Cs 142: Computer Programming Ii, Vanessa Starkey Jul 2010

Cs 142: Computer Programming Ii, Vanessa Starkey

Computer Science & Engineering Syllabi

Concepts introduced in CS 141 are developed in greater detail and depth.
Emphasis on verification and testing of programs. Three hours of lecture, two hours lab.

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Ceg 210-01: Pc Networking I, Karen Meyer Jul 2010

Ceg 210-01: Pc Networking I, Karen Meyer

Computer Science & Engineering Syllabi

Introduction to networking technologies including infrastructure and architectures, standards, protocols and directory services, administrations, security and management. Integrated lecture and lab.

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Ceg 220-01: Introduction To C Programming For Engineers - I, Ronald F. Taylor Jul 2010

Ceg 220-01: Introduction To C Programming For Engineers - I, Ronald F. Taylor

Computer Science & Engineering Syllabi

This course provides a general introduction to computers as a problem-solving tool using the C programming language. Emphasis is on algorithms and techniques useful to engineers. Topics include data representation, debugging, and program verification. Some programming assignments may involve complex arithmetic and trigonometric and exponential functions. 4 credit hours. The course includes a scheduled laboratory section for which you must register.

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Ceg 433/633-01: Operating Systems, Bin Wang Jul 2010

Ceg 433/633-01: Operating Systems, Bin Wang

Computer Science & Engineering Syllabi

No abstract provided.

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Ceg 730-01: Distributed Computing Principles, Yong Pei Jul 2010

Ceg 730-01: Distributed Computing Principles, Yong Pei

Computer Science & Engineering Syllabi

No abstract provided.

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The Sixth International Mathematics Education And Society Conference: Finding Freedom In A Mathematics Education Ghetto, David W. Stinson Jul 2010

The Sixth International Mathematics Education And Society Conference: Finding Freedom In A Mathematics Education Ghetto, David W. Stinson

Middle-Secondary Education and Instructional Technology Faculty Publications

In this editorial, the author relates his experiences at the Sixth International Mathematics Education and Society Conference, held March 2010 in Berlin, Germany, and explores whether urban mathematics educators can navigate historically marginalized racial, ethnic, religious, cultural, gendered, sexual, intellectual, and other communities to find freedom in a what he sees as a "mathematics education ghetto."

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The Nuts And Bolts: A Review Of Culturally Specific Pedagogy In The Mathematics Classroom: Strategies For Teachers And Students, Shonda Lemons-Smith Jul 2010

The Nuts And Bolts: A Review Of Culturally Specific Pedagogy In The Mathematics Classroom: Strategies For Teachers And Students, Shonda Lemons-Smith

Middle-Secondary Education and Instructional Technology Faculty Publications

The author reviews Jacqueline Leonard's Culturally Specific Pedagogy in the Mathematics Classroom: Strategies for Teachers and Students.

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Collaborative Evaluative Inquiry: A Model For Improving Mathematics Instruction In Urban Elementary Schools, Iman C. Chahine, Lesa M. Covington Clarkson Jul 2010

Collaborative Evaluative Inquiry: A Model For Improving Mathematics Instruction In Urban Elementary Schools, Iman C. Chahine, Lesa M. Covington Clarkson

Middle-Secondary Education and Instructional Technology Faculty Publications

In this article, the authors describe the cyclical process of a collaborative evaluative inquiry project and the data collected throughout the project—data that not only informed "next steps" during the project but also show promise in documenting the benefits of such projects. Over a period of 18 months, seven elementary teachers from a K–6 urban elementary school collaborated with university personnel using Parsons’s (2002) Evaluative Inquiry Model, a 5-stage, cyclical model that includes defining, planning, and investigating challenges; collecting, analyzing, and synthesizing data; and communicating findings that transpire through collaborative inquiry. Overall, the project focused on improving the elementary teachers’ …

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Some Reflections On Hernández And López’S Reflections On The Chain Rule, Michael N. Fried Jul 2010

Some Reflections On Hernández And López’S Reflections On The Chain Rule, Michael N. Fried

The Mathematics Enthusiast

To shed light on how history of mathematics can play a role in mathematics education, Hernández and López chose well in focusing on the chain rule as a case study. Generally speaking, it is, as they point out, a topic students find difficult to grasp: it is a rule involving a different order of complexity than, say, the rule for differentiating functions of the form f(x)=xn, and, although it can eventually become intuitive, it is far from intuitive at the start. Harel et al. (2009) have pointed out that students’ difficulties with the chain rule involve: “...coordinating three or more …

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Rules Without Reason: Allowing Students To Rethink Previous Conceptions, Mary Mueller, Dina Yankelewitz, Carolyn Maher Jul 2010

Rules Without Reason: Allowing Students To Rethink Previous Conceptions, Mary Mueller, Dina Yankelewitz, Carolyn Maher

The Mathematics Enthusiast

This paper reports on the strategies chosen by a group of sixth-grade students in an urban informal learning program as they worked to solve an open-ended, nonroutine task. In particular, the paper focuses on the ability of these students to rise above their previous, procedure-based misconceptions and arrive at a mathematically reasonable solution. Aspects of the problem task, the problem-solving environment, and, importantly, of the nature of the teacher’s interventions are analyzed to determine the conditions that encouraged students to approach mathematics as a logical, meaningful, sense-making activity.

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