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194,190 full-text articles. Page 5102 of 5169.

Space Weather & Gps Reliant Industries, Jennifer L. Meehan, W. Murtagh 2010 Utah State University

Space Weather & Gps Reliant Industries, Jennifer L. Meehan, W. Murtagh

All Physics Faculty Publications

No abstract provided.


The Effects Of Surface Modification On Spacecraft Charging Parameters, Amberly Evans, JR Dennison 2010 Utah State Univesity

The Effects Of Surface Modification On Spacecraft Charging Parameters, Amberly Evans, Jr Dennison

All Physics Faculty Publications

Charging of materials by incident radiation is affected by both environmental and physical conditions. Modifying a material’s physical surface will change its reflection, transmission and absorption of the incident radiation which are integrally related to the accumulation of charge and energy deposition in the material. An optical analysis of the effect of surface modification on spacecraft charging parameters on prototypical Kapton HN and Cu samples is presented. Samples were roughened with abrasive compounds ranging from 0.5 to 10 μm in size, comparable to the range of incident wavelengths. They were also contaminated with thin layers of DC 704 ...


Duskside F-Region Dynamo Currents: Itsrelationship With Prereversal Enhancement Of Vertical Plasma Drift, P. Park, H. Luhr, Bela G. Fejer, K. W. Mim 2010 Utah State University

Duskside F-Region Dynamo Currents: Itsrelationship With Prereversal Enhancement Of Vertical Plasma Drift, P. Park, H. Luhr, Bela G. Fejer, K. W. Mim

Bela G. Fejer

From magnetic field observations by CHAMP we estimate F-region dynamo current densities near the sunset terminator during solar maximum years from 2001 to 2002. The dynamo currents are compared with the pre-reversal enhancement (PRE) of vertical plasma drift as observed by ROCSAT-1. The seasonal-longitudinal variation of PRE can be largely related to the F-region dynamo current density, with the correlation coefficient reaching 0.74. The correlation can be further improved if we consider a zonal gradient of the E-region Pedersen conductivity, which also depends on season and longitude. It is widely accepted that the Fregion dynamo drives PRE near sunset ...


Utilizing The Technology Acceptance Model To Assess The Employee Adoption Of Information Systems Security Measures, Cynthia M. Jones, Richard V. McCarthy, Leila Halawi, Bahaudin Mujtaba 2010 Nova Southeastern University

Utilizing The Technology Acceptance Model To Assess The Employee Adoption Of Information Systems Security Measures, Cynthia M. Jones, Richard V. Mccarthy, Leila Halawi, Bahaudin Mujtaba

Publications

In this study, the factors that affect employee acceptance of information systems security measures were examined by extending the Technology Acceptance Model. Partial least squares structural equation modeling was applied to examine these factors. 174 valid responses from employees from companies in various industry segments in the United States and Canada were analyzed. The results of the statistical analysis indicate that subjective norm moderated by management support showed the strongest effect on intention to use information systems security measures.


Naturalism, Nature And Questions Of Style In Jinsha River Rock Art, Northwest Yunnan, China, Paul S. C. Tacon, Li Gang, Yang Decong, Sally K. May, Liu Hong, Maxime Aubert, Ji Xueping, Darren Curnoe, Andy I. R. Herries 2010 Griffith University

Naturalism, Nature And Questions Of Style In Jinsha River Rock Art, Northwest Yunnan, China, Paul S. C. Tacon, Li Gang, Yang Decong, Sally K. May, Liu Hong, Maxime Aubert, Ji Xueping, Darren Curnoe, Andy I. R. Herries

Faculty of Science - Papers (Archive)

The naturalistic rock art of Yunnan Province is poorly known outside of China despite two decades of investigation by local researchers. The authors report on the first major international study of this art, its place in antiquity and its resemblance to some of the rock art of Europe, southern Africa and elsewhere. While not arguing a direct connection between China, Europe and other widely separated places, this article suggests that rock-art studies about the nature of style, culture contact and the transmission of iconography across space and time need to take better account of the results of neuroscience research, similar ...


A Spatial Agent-Based Model To Explore Scenarios Of Adaptation To Climate Change In An Alpine Tourism Destination, Stefano Balbi, Pascal Perez, Carlo Giupponi 2010 University of Wollongong

A Spatial Agent-Based Model To Explore Scenarios Of Adaptation To Climate Change In An Alpine Tourism Destination, Stefano Balbi, Pascal Perez, Carlo Giupponi

SMART Infrastructure Facility - Papers

A vast body of literature suggests that the European Alpine region may be one of the most sensitive to climate change impacts. Adaptation to climate change of Alpine socioecosystems is increasingly becoming an issue of interest for the scientific community while the people of the Alps are often unaware of or simply ignore the problem. ClimAlpTour is a European research project of the Alpine Space Programme, bringing together institutions and scholars from all countries of the Alpine arch, in view of dealing with the expected decrease in snow and ice cover, which may lead to a rethinking of tourism development ...


A Fiber Bragg Grating Sensor System For Train Axle Counting, Chu-liang Wei, Chun-cheung Lai, Shun-yee Liu, W.H. Chung, T. K. Ho, Hwa-yaw Tam, S. L. Ho, A. McCusker, J. Kam, K. Y. Lee 2010 Shantou University

A Fiber Bragg Grating Sensor System For Train Axle Counting, Chu-Liang Wei, Chun-Cheung Lai, Shun-Yee Liu, W.H. Chung, T. K. Ho, Hwa-Yaw Tam, S. L. Ho, A. Mccusker, J. Kam, K. Y. Lee

SMART Infrastructure Facility - Papers

Railway signaling facilitates two main functions, namely, train detection and train control, in order to maintain safe separations among the trains. Track circuits are the most commonly used train detection means with the simple open/close circuit principles; and subsequent adoption of axle counters further allows the detection of trains under adverse track conditions. However, with electrification and power electronics traction drive systems, aggravated by the electromagnetic interference in the vicinity of the signaling system, railway engineers often find unstable or even faulty operations of track circuits and axle counting systems, which inevitably jeopardizes the safe operation of trains. A ...


Net Neutrality Regulation: The Economic Evidence , Jerry Brito, Martin E. Cave, Robert W. Crandall, Larry F. Darby, Everett Ehrlich, Jeffrey A. Eisenach, Jerry Ellig, Henry Ergas, David J. Farber, Gerald R. Faulhaber, Robert W. Hahn, Alfred E. Kahn, Wayne A. Leighton, Robert E. Litan, Glen O. Robinson, Hal J. Singer, Vernon L. Smith, William E. Taylor III, Timothy J. Tardiff, Leonard Waverman, Dennis Weisman 2010 George Mason University

Net Neutrality Regulation: The Economic Evidence , Jerry Brito, Martin E. Cave, Robert W. Crandall, Larry F. Darby, Everett Ehrlich, Jeffrey A. Eisenach, Jerry Ellig, Henry Ergas, David J. Farber, Gerald R. Faulhaber, Robert W. Hahn, Alfred E. Kahn, Wayne A. Leighton, Robert E. Litan, Glen O. Robinson, Hal J. Singer, Vernon L. Smith, William E. Taylor Iii, Timothy J. Tardiff, Leonard Waverman, Dennis Weisman

SMART Infrastructure Facility - Papers

In the authors' shared opinion, the economic evidence does not support the regulations proposed in the Commission’s Notice of Proposed Rulemaking Regarding Preserving the Open Internet and Broadband Industry Practices (the “NPRM”). To the contrary, the economic evidence provides no support for the existence of market failure sufficient to warrant ex ante regulation of the type proposed by the Commission, and strongly suggests that the regulations, if adopted, would reduce consumer welfare in both the short and long run. To the extent the types of conduct addressed in the NPRM may, in isolated circumstances, have the potential to harm ...


Action Research, Knowledge & Impact: Experiences Of The Global Livestock Crsp Pastoral Risk Management Project In The Southern Ethiopian Rangelands, D. Layne Coppock 2010 Utah State University

Action Research, Knowledge & Impact: Experiences Of The Global Livestock Crsp Pastoral Risk Management Project In The Southern Ethiopian Rangelands, D. Layne Coppock

Environment and Society Faculty Publications

No abstract provided.


Spectral Shifts And Switches In Random Fields Upon Interaction With Negative-Phase Materials, Zhisong Tong, Olga Korotkova 2010 University of Miami

Spectral Shifts And Switches In Random Fields Upon Interaction With Negative-Phase Materials, Zhisong Tong, Olga Korotkova

Physics Articles and Papers

Spectral shifts in stochastic beam-like fields on interaction with layers of positive- and negative-phase materials are examined on the basis of the ABCD-matrix approach and generalized Huygens-Fresnel principle. It is found that boundaries between such materials may cause spectral switches. Effect of absorption of negative-phase materials on the beam spectrum is discussed. Our results may find applications in connection with spectrum-selection optical interconnects, spectrally encoded information transfer, image formation in systems involving negative-phase materials, and geometrically tunable metamaterials.


Insights Into Rock-Ice Avalanche Dynamics By Combined Analysis Of Seismic Recordings And A Numerical Avalanche Mode, Demian Schneider, Perry Bartelt, Jacqueline Caplan-Auerbach, Marc Christen, Christian Huggel, Brian W. McArdell 2010 Western Washington University

Insights Into Rock-Ice Avalanche Dynamics By Combined Analysis Of Seismic Recordings And A Numerical Avalanche Mode, Demian Schneider, Perry Bartelt, Jacqueline Caplan-Auerbach, Marc Christen, Christian Huggel, Brian W. Mcardell

Geology Faculty Publications

Rock‐ice avalanches larger than 1 × 106 m3 are high‐magnitude, low‐frequency events that may occur in all ice‐covered, high mountain areas around the world and can cause extensive damage if they reach populated regions. The temporal and spatial evolution of the seismic signature from two events was analyzed, and recordings at selected stations were compared to numerical model results of avalanche propagation. The first event is a rock‐ice avalanche from Iliamna volcano in Alaska which serves as a “natural laboratory” with simple geometric conditions. The second one originated on Aoraki/Mt. Cook, New Zealand ...


Stochastic Electromagnetic Beams In Positive-And Negative-Phase Materials, Zhisong Tong, Olga Korotkova 2010 University of Miami

Stochastic Electromagnetic Beams In Positive-And Negative-Phase Materials, Zhisong Tong, Olga Korotkova

Physics Articles and Papers

Theoretical analysis of interaction of stochastic electromagnetic beamlike fields with positive- and negative-phase materials suggests that suitable combinations of such materials can serve as media where spectral, coherence, and polarization properties of beams can self-reconstruct.


Theory Of Weak Scattering Of Stochastic Electromagnetic Fields From Deterministic And Random Media, Zhisong Tong, Olga Korotkova 2010 University of Miami

Theory Of Weak Scattering Of Stochastic Electromagnetic Fields From Deterministic And Random Media, Zhisong Tong, Olga Korotkova

Physics Articles and Papers

The theory of scattering of scalar stochastic fields from deterministic and random media is generalized to the electromagnetic domain under the first-order Born approximation. The analysis allows for determining the changes in spectrum, coherence, and polarization of electromagnetic fields produced on their propagation from the source to the scattering volume, interaction with the scatterer, and propagation from the scatterer to the far field. An example of scattering of a field produced by a δ-correlated partially polarized source and scattered from a δ-correlated medium is provided.


Side By Side Measurements Of Co2 By Ground-Based Fourier Transform Spectrometry (Fts), Janina Messerschmidt, Ronald Macatangay, Justus Notholt, Christof Petri, Thorsten Warneke, Christine Weinzierl 2010 University of Bremen

Side By Side Measurements Of Co2 By Ground-Based Fourier Transform Spectrometry (Fts), Janina Messerschmidt, Ronald Macatangay, Justus Notholt, Christof Petri, Thorsten Warneke, Christine Weinzierl

Faculty of Science - Papers (Archive)

High resolution solar absorption Fourier transform spectrometry (FTS) is the most precise ground-based remote sensing technique to measure the total column of atmospheric carbon dioxide. For carbon cycle studies as well as for the calibration and validation of spaceborne sensors the instrumental comparability of FTS systems is of critical importance. Retrievals from colocated measurements by two identically constructed FTS systems have been compared for the first time. Under clear sky conditions a precision for the retrieved xCO2 better than ∼0.1% is demonstrated and the instruments agree within ∼0.07%. An important factor in achieving such good comparability of the ...


Recent And Future Warm Extreme Events And High-Mountain Slope Stability, C. Huggel, N. Salzmann, S. Allen, Jacqueline Caplan-Auerbach, L. Fischer, W. Haeberli, C. Larsen, D. Schneider, R. Wessels 2010 Western Washington University

Recent And Future Warm Extreme Events And High-Mountain Slope Stability, C. Huggel, N. Salzmann, S. Allen, Jacqueline Caplan-Auerbach, L. Fischer, W. Haeberli, C. Larsen, D. Schneider, R. Wessels

Geology Faculty Publications

The number of large slope failures in some high-mountain regions such as the European Alps has increased during the past two to three decades. There is concern that recent climate change is driving this increase in slope failures, thus possibly further exacerbating the hazard in the future. Although the effects of a gradual temperature rise on glaciers and permafrost have been extensively studied, the impacts of short-term, unusually warm temperature increases on slope stability in high mountains remain largely unexplored. We describe several large slope failures in rock and ice in recent years in Alaska, New Zealand and the European ...


An Assessment Of Factors Affecting Population Growth Of The Mountain Plover, Stephen J. Dinsmore, Michael B. Wunder, Victoria J. Dreitz, Fritz L. Knopf 2010 Iowa State University

An Assessment Of Factors Affecting Population Growth Of The Mountain Plover, Stephen J. Dinsmore, Michael B. Wunder, Victoria J. Dreitz, Fritz L. Knopf

Natural Resource Ecology and Management Publications

Effective conservation measures should target the most sensitive life history attributes of a species, assuming they are responsive to potential management actions. The Mountain Plover (Charadrius montanus) is a species of conservation concern with a patchy breeding distribution in western North America. Plovers prefer areas with short vegetation, bare ground, and disturbance for nesting. Current management tools, including grazing and burning, have been used to attract plovers and enhance nesting success. We used a stage-specific matrix model to study the influence of vital rates, e.g., juvenile and adult annual survival, on population growth rate in the Mountain Plover at ...


Selective Adsorption Of Dibenzothiophenes On Activated Carbons With Metal Species Deposited On Their Surfaces, Jakub Lison 2010 CUNY City College

Selective Adsorption Of Dibenzothiophenes On Activated Carbons With Metal Species Deposited On Their Surfaces, Jakub Lison

Dissertations and Theses

"The objective of this thesis is an investigation of influence of porosity, surface chemistry, material composition and effects of metals oncarbon adsorbents in desulfurization of liquid fuels. Materials are derived from poly (4-styrenesulfonic acid-co-maleic acid) salts (sodium or transition metals). They are investigated in a dynamic breakthrough process using model diesel fuel containing dibenzothiophene (DBT) and 4, 6-dimethyldibenzothiophene (DMDBT). The performance of adsorbents is evaluated in terms of the capacity and selectivity. Differences in performance are investigated considering the porosity, surface chemistry and the type of material used."


Modular Synthesis Of Weinreb Amides Of 2-Fluoro-2,4-Dienoic Acids, Mohammad Chowdhury 2010 CUNY City College

Modular Synthesis Of Weinreb Amides Of 2-Fluoro-2,4-Dienoic Acids, Mohammad Chowdhury

Dissertations and Theses

No abstract provided.


Ditopic Dithiophosphonates And Their Related Rotaxanes, Robert Ray Baum Jr. 2010 Eastern Illinois University

Ditopic Dithiophosphonates And Their Related Rotaxanes, Robert Ray Baum Jr.

Masters Theses

No abstract provided.


The Longitude Problem From The 1700s To Today: An International And General Education Physics Course, Thomas J. Bensky 2010 California Polytechnic State University - San Luis Obispo

The Longitude Problem From The 1700s To Today: An International And General Education Physics Course, Thomas J. Bensky

Physics

For instructors wishing to use physics as part of an international or general education course, the framework for a course based on the “longitude problem” from the 1700s is described. The longitude problem is teeming with basic principles of physics and astronomy, which makes it ideal for a non-science-major-based college-level course. This paper summarizes the longitude problem in the context of conceptual physics and astronomy and outlines an appropriate curriculum. Specifics on teaching such a course in London, as part of an international studies program, are discussed.


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