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2007

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Articles 1951 - 1980 of 6758

Full-Text Articles in Physical Sciences and Mathematics

Electronic, Magnetic And Transport Properties Of Rare-Earth Monopnictides, Chun-Gang Duan, Ildar F. Sabiryanov, Wai-Ning Mei, Peter A. Dowben, Sitaram Jaswal, Evgeny Y. Tsymbal Jul 2007

Electronic, Magnetic And Transport Properties Of Rare-Earth Monopnictides, Chun-Gang Duan, Ildar F. Sabiryanov, Wai-Ning Mei, Peter A. Dowben, Sitaram Jaswal, Evgeny Y. Tsymbal

Peter Dowben Publications

The electronic structures and magnetic properties of many rare-earth monopnictides are reviewed in this article. Possible candidate materials for spintronics devices from the rare-earth monopnictide family, i.e. high polarization (nominally half-metallic) ferromagnets and antiferromagnets, are identified. We attempt to provide a unified picture of the electronic properties of these strongly correlated systems. The relative merits of several ab initio theoretical methods, useful in the study of the rare-earth monopnictides, are discussed. We present our current understanding of the possible half-metallicity, semiconductor–metal transitions, and magnetic orderings in the rare-earth monopnictides. Finally, we propose some potential strategies to improve the magnetic and …

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Epitaxial Growth And Surface Properties Of Half-Metal Nimnsb Films, C. N. Borca, D. Ristoiu, H.-K. Jeong, Takashi Komesu, A. N. Caruso, J. Pierre, L. Ranno, J. P. Nozieres, Peter A. Dowben Jul 2007

Epitaxial Growth And Surface Properties Of Half-Metal Nimnsb Films, C. N. Borca, D. Ristoiu, H.-K. Jeong, Takashi Komesu, A. N. Caruso, J. Pierre, L. Ranno, J. P. Nozieres, Peter A. Dowben

Peter Dowben Publications

We present, herein, an extended study of the half-Heusler alloy NiMnSb, starting with the deposition technique, continuing with the basic structural and magnetic properties of the thin films, and finishing with the electronic and compositional properties of their surfaces. The experimental methods we apply combine magnetization and magnetoresistivity measurements, atomic force microscopy, ferromagnetic resonance, x-ray and neutron diffraction, low energy electron diffraction, angle resolved x-ray photoemission, extended x-ray absorption fine structure spectroscopy, soft x-ray magnetic circular dichroism and spin polarized inverse photoemission spectroscopy. We find that stoichiometric surfaces exhibit close to 100% spin polarization at the centre of the surface …

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A Model For Managing Decision-Making Information In The Gig-Enabled Battlespace, Samuel D. Bass, Rusty O. Baldwin Jul 2007

A Model For Managing Decision-Making Information In The Gig-Enabled Battlespace, Samuel D. Bass, Rusty O. Baldwin

Computer Science Faculty Publications

The Defense Department is transforming information-technology systems into a Global Information Grid (GIG) that will connect sensors to weapons systems and provide unprecedented situational awareness. The authors suggest that if not properly implemented, the GIG may overwhelm war fighters with information presented at the wrong time, at the wrong level of detail, and without proper analysis. This article proposes a model to direct the flow of information in the GIG.

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Hierarchical Collective Agent Network (Hcan) For Efficient 3 Fusion And Management Of Multiple Networked Sensors, Qiuming Zhu, Stuart L. Aldridge, Tomas N. Resha Jul 2007

Hierarchical Collective Agent Network (Hcan) For Efficient 3 Fusion And Management Of Multiple Networked Sensors, Qiuming Zhu, Stuart L. Aldridge, Tomas N. Resha

Computer Science Faculty Publications

Agent-based software systems and applications are constructed by integrating diverse sets of components that are intelligent, heterogeneous, distributed, and concurrent. This paper describes a multi-agent system to assure the operation efficiency and reliability in data fusion and management of a set of networked distributive sensors (NDS). We discuss the general concept and architecture of a Hierarchical Collective Agent Network (HCAN) and its functional components for learning and adaptive control of the NDS. Sophistication of a HCAN control environment and an anatomy of the agent modules for enabling intelligent data fusion and management are presented. An exemplar HCAN is configured to …

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Scwds Briefs: Volume 23, Number 2 (July 2007), Gary L. Doster , Editor, Scwds Briefs, Michael J. Yabsley Jul 2007

Scwds Briefs: Volume 23, Number 2 (July 2007), Gary L. Doster , Editor, Scwds Briefs, Michael J. Yabsley

Southeastern Cooperative Wildlife Disease Study: Publications

Table of Contents:

SCWDS History Continued: The CapChur Gun

SCWDS Honored

More Interesting HD Events from 2006

Fever Ticks

Ehrlichia in White-tailed Deer

Meningeal Worms in Sika Deer

The Devils’ Disease

Recent SCWDS Publications Available

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Measurements Of Mesospheric Sodium Abundance Above The Hawaiian Islands, Lewis C. Roberts, Jr., L. William Bradford, Christopher R. Neyman, Alan Z. Liu Jul 2007

Measurements Of Mesospheric Sodium Abundance Above The Hawaiian Islands, Lewis C. Roberts, Jr., L. William Bradford, Christopher R. Neyman, Alan Z. Liu

Physical Sciences - Daytona Beach

Laser guide stars have increased the utility of adaptive optics systems by expanding the number of observable objects. The most common type of laser excites sodium in the mesosphere, and mesospheric sodium density is key to the performance of the laser. While a variety of observatories have conducted studies of the mesospheric sodium density, there are no published studies from Hawaii, which is home to some of the largest telescopes in the world. This paper presents mesospheric sodium densities measured by the University of Illinois lidar for 165 hr spanning 25 nights over 3 years. The mean sodium column density …

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O(1s), Oh, And O2(B) Airglow Layer Perturbations Due To Agws And Their Implied Effects On The Atmosphere, Fabio Vargas, Gary Swenson, Alan Liu, Delano Gobbi Jul 2007

O(1s), Oh, And O2(B) Airglow Layer Perturbations Due To Agws And Their Implied Effects On The Atmosphere, Fabio Vargas, Gary Swenson, Alan Liu, Delano Gobbi

Physical Sciences - Daytona Beach

The O(1S) (green line) night airglow emission in response to atmospheric gravity wave (AGW) perturbations was simulated with a linear, one-dimensional model. The results were combined with previously modeled O2(b, 0–1) atmospheric band and OH Meinel band emission response (Liu and Swenson, 2003) to derive amplitude and phase relations among multiple airglow layers in response to gravity waves with various intrinsic parameters and damping rates (β). The simulations show that the vertical profile of the standard deviation of the perturbed green line volume emission rate (VER) has a centroid altitude that is 3 km …

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The Business Model Of "Software-As-A-Service", Dan Ma Jul 2007

The Business Model Of "Software-As-A-Service", Dan Ma

Research Collection School Of Computing and Information Systems

The emergence of the software-as-a-service (SaaS) business model has attracted great attentions from both researchers and practitioners. SaaS vendors deliver on-demand information processing services to users, and thus offer computing utility rather than the standalone software itself. In this work, the author propose an analytical model to study the competition between the SaaS and the traditional COTS (commercial off-the-shelf) solutions for software applications. The author show that when software applications become open, modulated, and standardized, the SaaS business model will take a significant market share. In addition, under certain market conditions, offering users an easy exit option through the software …

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As Flat As Possible, Jon T. Jacobsen Jul 2007

As Flat As Possible, Jon T. Jacobsen

All HMC Faculty Publications and Research

How does one determine a surface which is as flat as possible, such as those created by soap film surfaces? What does it mean to be as flat as possible? In this paper we address this question from two distinct points of view, one local and one global in nature. Continuing with this theme, we put a temporal twist on the question and ask how to evolve a surface so as to flatten it as efficiently as possible. This elementary discussion provides a platform to introduce a wide range of advanced topics in partial differential equations and helps students …

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Effects Of Htert On Genomic Instability Caused By Either Metals Or Radiation Or Combined Exposure, Antonino Glaviano Jul 2007

Effects Of Htert On Genomic Instability Caused By Either Metals Or Radiation Or Combined Exposure, Antonino Glaviano

Doctoral

There is currently a great interest in delayed chromosomal damage and other damaging effects of low-dose exposure to a variety of agents, which appear collectively to act through induction of stress-response pathways related to oxidative stress (and aging). These agents have been studied mostly in the radiation field but evidence is accumulating that chemicals, especially heavy metals, can also act in the same manner. Therefore, this work investigated the effects of metals and/or radiation in human fibroblasts in vitro. Humans are exposed to metals, including chromium (CR) VI) and vanadium (V) (V) from the environment, industry and surgical implants. Thus …

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Canadian Cooperative Wildlife Health Centre Annual Report 2006-2007 Jul 2007

Canadian Cooperative Wildlife Health Centre Annual Report 2006-2007

Canadian Cooperative Wildlife Health Centre: Newsletters and Publications

Message from the Chair, Board of Directors by Charles Rhodes
About the CCWHC
Wildlife Disease Surveillance
Information Services
Education
Wildlife Disease Response and Management
Publications and Reports: A Sample of Publications by CCWHC Staff
Financial Report for 2006-2007-Statement of Revenues and Expenses
CCWHC Staff and Associates - 2006-2007
CCWHC Board of Directors - 2006-2007

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A Semantic Framework For Identifying Events In A Service Oriented Architecture, Karthik Gomadam, Ajith Harshana Ranabahu, Lakshmish Ramaswamy, Amit P. Sheth, Kunal Verma Jul 2007

A Semantic Framework For Identifying Events In A Service Oriented Architecture, Karthik Gomadam, Ajith Harshana Ranabahu, Lakshmish Ramaswamy, Amit P. Sheth, Kunal Verma

Kno.e.sis Publications

We propose a semantic framework for automatically identifying events as a step towards developing an adaptive middleware for Service Oriented Architecture (SOA). Current related research focuses on adapting to events that violate certain non-functional objectives of the service requestor. Given the large of number of events that can happen during the execution of a service, identifying events that can impact the non-functional objectives of a service request is a key challenge. To address this problem we propose an approach that allows service requestors to create semantically rich service requirement descriptions, called semantic templates. We propose a formal model for expressing …

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Fall 2007 Nova Southeastern University Undergraduate Student Catalog, Nova Southeastern University Jul 2007

Fall 2007 Nova Southeastern University Undergraduate Student Catalog, Nova Southeastern University

Undergraduate Programs Course Catalogs

No abstract provided.

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Reinforcement Learning Based Output-Feedback Control Of Nonlinear Nonstrict Feedback Discrete-Time Systems With Application To Engines, Peter Shih, Jonathan B. Vance, Brian C. Kaul, Jagannathan Sarangapani, J. A. Drallmeier Jul 2007

Reinforcement Learning Based Output-Feedback Control Of Nonlinear Nonstrict Feedback Discrete-Time Systems With Application To Engines, Peter Shih, Jonathan B. Vance, Brian C. Kaul, Jagannathan Sarangapani, J. A. Drallmeier

Electrical and Computer Engineering Faculty Research & Creative Works

A novel reinforcement-learning based output-adaptive neural network (NN) controller, also referred as the adaptive-critic NN controller, is developed to track a desired trajectory for a class of complex nonlinear discrete-time systems in the presence of bounded and unknown disturbances. The controller includes an observer for estimating states and the outputs, critic, and two action NNs for generating virtual, and actual control inputs. The critic approximates certain strategic utility function and the action NNs are used to minimize both the strategic utility function and their outputs. All NN weights adapt online towards minimization of a performance index, utilizing gradient-descent based rule. …

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Online Reinforcement Learning-Based Neural Network Controller Design For Affine Nonlinear Discrete-Time Systems, Qinmin Yang, Jagannathan Sarangapani Jul 2007

Online Reinforcement Learning-Based Neural Network Controller Design For Affine Nonlinear Discrete-Time Systems, Qinmin Yang, Jagannathan Sarangapani

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a novel reinforcement learning neural network (NN)-based controller, referred to adaptive critic controller, is proposed for general multi-input and multi- output affine unknown nonlinear discrete-time systems in the presence of bounded disturbances. Adaptive critic designs consist of two entities, an action network that produces optimal solution and a critic that evaluates the performance of the action network. The critic is termed adaptive as it adapts itself to output the optimal cost-to-go function and the action network is adapted simultaneously based on the information from the critic. In our online learning method, one NN is designated as the …

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Cs 765: Foundations Of Neurocomputation, Mateen M. Rizki Jul 2007

Cs 765: Foundations Of Neurocomputation, Mateen M. Rizki

Computer Science & Engineering Syllabi

This course is designed to help you develop a solid understanding of neural network algorithms and architectures. At the end of this course you should be able to read and critically evaluate most neural network papers published in major journals, (e.g. IEEE Transaction on Neural Networks, Neural Networks, and Neural Computation). In addition, you should be able to implement a broad range of network architectures and learning algorithms for a variety of applications.

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Cs 241: Introduction To Computer Science Ii, Haiyun Bian Jul 2007

Cs 241: Introduction To Computer Science Ii, Haiyun Bian

Computer Science & Engineering Syllabi

This course is the second in the three course sequence "Introduction to Computer Science" offered by the Computer Science department, WSU. Concepts introduced in CS 240 are developed in greater detail and depth with the Java programming language. Topics include object oriented programming, basic sorting algorithms, recursion, graphics, development of user interfaces and exception handling. Student must register for one lecture section and one lab section.

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Cs 141: Computer Programming I, Eric Maston Jul 2007

Cs 141: Computer Programming I, Eric Maston

Computer Science & Engineering Syllabi

This course provides a general introduction to the fundamentals of computer programming. Examples from and applications to a broad range of problems are given. No prior knowledge of programming is assumed. The concepts covered will be applied to the Java programming language.

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Semantics To Energize The Full Services Spectrum: Ontological Approach To Better Exploit Services At Technical And Business Levels, Amit P. Sheth Jul 2007

Semantics To Energize The Full Services Spectrum: Ontological Approach To Better Exploit Services At Technical And Business Levels, Amit P. Sheth

Kno.e.sis Publications

Services are pervasive in today’s economic landscape, and services- based architectures are being rapidly adopted as IT infrastructure. The need to take a broader perspective of services to include people and organizational descriptions as opposed to technical interface descriptions has already been recognized as part of an overall vision of services science [46, 100]. This article describes the Semantic Services Science (3S) model, which seeks to demonstrate the essential benefits of semantics in view of the broader vision of services science by using service descriptions that capture technical, human, organizational, and business value aspects. We assert that ontology-based semantic modeling …

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Efficient Computation Of Iceberg Cubes By Bounding Aggregate Functions, Xiuzhen Zhang, Pauline Lienhua Chou, Guozhu Dong Jul 2007

Efficient Computation Of Iceberg Cubes By Bounding Aggregate Functions, Xiuzhen Zhang, Pauline Lienhua Chou, Guozhu Dong

Kno.e.sis Publications

The iceberg cubing problem is to compute the multidimensional group-by partitions that satisfy given aggregation constraints. Pruning unproductive computation for iceberg cubing when nonantimonotone constraints are present is a great challenge because the aggregate functions do not increase or decrease monotonically along the subset relationship between partitions. In this paper, we propose a novel bound prune cubing (BP-Cubing) approach for iceberg cubing with nonantimonotone aggregation constraints. Given a cube over n dimensions, an aggregate for any group-by partition can be computed from aggregates for the most specific n--dimensional partitions (MSPs). The largest and smallest aggregate values computed this way become …

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Role Of Subsurface Defects In Metal-Zno(0001) Schottky Barrier Formation, H. L. Mosbacker, S. El Hage, M. Gonzalez, S. A. Ringel, M. J. Hetzer, David C. Look, G. Cantwell, J. Zhang, J. J. Song, L. J. Brillson Jul 2007

Role Of Subsurface Defects In Metal-Zno(0001) Schottky Barrier Formation, H. L. Mosbacker, S. El Hage, M. Gonzalez, S. A. Ringel, M. J. Hetzer, David C. Look, G. Cantwell, J. Zhang, J. J. Song, L. J. Brillson

Physics Faculty Publications

The authors fabricated diodes of Au, Al, Ni, Pt, Pd, Mo, Ta, and Ir on single crystal ZnO(0001) surfaces from different vendors and measured their Schottky barriers, idealities, and reverse currents on as-received and remote oxygen (20% O2/80%He) plasma-treated surfaces. Using low temperature nanoscale depth-resolved cathodoluminescence spectroscopy (DRCLS) under the metal, the authors identified the presence of defect transitions at 2.1, 2.5, and 3.0 eV that change dramatically depending on the process steps and choice of metal. I-V measurements exhibited transitions from Ohmic to Schottky and lower idealities for Pt, Au, Ir, and Pd with plasma treatment. ZnO …

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Electron And Hole Traps In N-Doped Zno Grown On P-Type Si By Metalorganic Chemical Vapor Deposition, Z-Q. Fang, B. Claflin, David C. Look, Lei L. Kerr, Xiaonan Li Jul 2007

Electron And Hole Traps In N-Doped Zno Grown On P-Type Si By Metalorganic Chemical Vapor Deposition, Z-Q. Fang, B. Claflin, David C. Look, Lei L. Kerr, Xiaonan Li

Physics Faculty Publications

Electron and hole traps in N-doped ZnO were investigated using a structure of n+-ZnO:Al/i-ZnO/ZnO:N grown on a p-Si substrate by metalorganic chemical vapor deposition (for growth of the ZnO:N layer) and sputtering deposition (for growth of the i-ZnO and n+-ZnO:Al layers). Current-voltage and capacitance-voltage characteristics measured at temperatures from 200 to 400 K show that the structure is an abrupt n+−p diode with very low leakage currents. By using deep level transient spectroscopy, two hole traps, H3 (0.35 eV) and H4 (0.48 eV), are found in the p-Si …

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The Cosmic Ray Observatory Project: A Statewide Outreach And Education Experiment In Nebraska, Daniel R. Claes, Gregory R. Snow Jul 2007

The Cosmic Ray Observatory Project: A Statewide Outreach And Education Experiment In Nebraska, Daniel R. Claes, Gregory R. Snow

Gregory Snow Publications

The Cosmic Ray Observatory Project (CROP) is a statewide education and research experiment involving Nebraska high school students, teachers and university undergraduates in the study of extensive cosmic-ray air showers. A network of high school teams construct, install, and operate school-based detectors in coordination with University of Nebraska physics professors and graduate students. The detector system at each school is an array of scintillation counters recycled from the Chicago Air Shower Array in weather-proof enclosures on the school roof, with a GPS receiver providing a time stamp for cosmic-ray events. The detectors are connected to triggering electronics and a data-acquisition …

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Theoretical Analysis Of Dynamic Chemical Imaging With Lasers Using High-Order Harmonic Generation, Van-Hoang Le, Anh-Thu Le, Rui-Hua Xie, C. D. Lin Jul 2007

Theoretical Analysis Of Dynamic Chemical Imaging With Lasers Using High-Order Harmonic Generation, Van-Hoang Le, Anh-Thu Le, Rui-Hua Xie, C. D. Lin

Physics Faculty Research & Creative Works

We report theoretical investigations of the tomographic procedure suggested by Itatani et al. [Nature (London) 432, 867 (2004)] for reconstructing highest occupied molecular orbitals (HOMOs) using high-order harmonic generation (HHG). Due to the limited range of harmonics from the plateau region, we found that even under the most favorable assumptions, it is still very difficult to obtain accurate HOMO wave functions using the tomographic procedure, but the symmetry of the HOMOs and the internuclear separation between the atoms can be accurately extracted, especially when lasers of longer wavelengths are used to generate the HHG. Since the tomographic procedure relies on …

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Diffractive Photoproduction Of D*±(2010) At Hera, S. Chekanov, M. Derrick, S. Magill, B. Musgrave, D. Nicholass, J. Repond, R. Yoshida, Margarita C. K. Mattingly, M. Jechow, N. Pavel, A. G. Yagües Molina, S. Antonelli, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, M. Bindi, D. Boscherini, A. Bruni, G. Bruni, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, S. De Pasquale, G. Iacobucci, A. Margotti, R. Nania, A. Polini, G. Sartorelli, A. Zichichi Jul 2007

Diffractive Photoproduction Of D*±(2010) At Hera, S. Chekanov, M. Derrick, S. Magill, B. Musgrave, D. Nicholass, J. Repond, R. Yoshida, Margarita C. K. Mattingly, M. Jechow, N. Pavel, A. G. Yagües Molina, S. Antonelli, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, M. Bindi, D. Boscherini, A. Bruni, G. Bruni, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, S. De Pasquale, G. Iacobucci, A. Margotti, R. Nania, A. Polini, G. Sartorelli, A. Zichichi

Faculty Publications

Diffractive photoproduction of D*±(2010) mesons was measured with the ZEUS detector at the ep collider HERA, using an integrated luminosity of 78.6 pb-1. The D* mesons were reconstructed in the kinematic range: transverse momentum pT(D*) > 1.9 GeV and pseudorapidity |η(D*)|

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Classical-Quantum Correspondence In Electron-Positron Pair Creation, N I. Chott, Qichang Su, Rainer Grobe Jul 2007

Classical-Quantum Correspondence In Electron-Positron Pair Creation, N I. Chott, Qichang Su, Rainer Grobe

Faculty publications – Physics

We examine the creation of electron-positron pairs in a very strong force field. Using numerical solutions to quantum field theory we calculate the spatial and momentum probability distributions for the created particles. A comparison with classical mechanical phase space calculations suggests that despite the fully relativistic and quantum mechanical nature of the matter creation process, most aspects can be reproduced accurately in terms of classical mechanics.

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Water. Commons Or Commodity?: The Future Of Water, Marcia Brewster Jul 2007

Water. Commons Or Commodity?: The Future Of Water, Marcia Brewster

New England Journal of Public Policy

This article by Marcia Brewster is taken from the proceedings of the EPIIC Symposium at Tufts University in February 2005.

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Oil. Geopolitics Reborn: Oil, Natural Gas, And Other Vital Resources, Michael T. Klare Jul 2007

Oil. Geopolitics Reborn: Oil, Natural Gas, And Other Vital Resources, Michael T. Klare

New England Journal of Public Policy

Competition over vital resources is a potent source of international friction among nations and within states. The result is the increasing interplay of international and internal struggles and the growing militarization of the global energy resource quest.

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Fueling The Superpowers: Russia As A Player In World Energy, Theresa Sabonis-Helf Jul 2007

Fueling The Superpowers: Russia As A Player In World Energy, Theresa Sabonis-Helf

New England Journal of Public Policy

This article by Theresa Sabonis-Helf is taken from the proceedings of the EPIIC Symposium at Tufts University, February 2005

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Developing On-Line Collaborative Research Across International Boundaries: Exploring The Potential Of New Technologies, Pat Jefferies, Frances Grodzinsky Jul 2007

Developing On-Line Collaborative Research Across International Boundaries: Exploring The Potential Of New Technologies, Pat Jefferies, Frances Grodzinsky

School of Computer Science & Engineering Faculty Publications

The development of on-line research practice across international boundaries is now a viable proposition using available asynchronous technologies such as computer conferencing. As has been reported in previous papers (Grodzinsky, et al, 2002; Griffin, et al, 2002) such use has proved to be extremely valuable for supporting the teaching of computing and ethics. However, asynchronous computer conferencing not only offers new opportunities for teaching and for supporting students, it also offers a valuable resource to researchers. Taking advantage of such opportunity must, of course, address a number of issues. Prime amongst these are concerns as to how to overcome the …

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