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Articles 1891 - 1920 of 2389
Full-Text Articles in Entire DC Network
Quality And Characteristics Of Recent Research In Technology Education, Scott D. Johnson, Jenny Daugherty
Quality And Characteristics Of Recent Research In Technology Education, Scott D. Johnson, Jenny Daugherty
Publications
The focus of research in technology education has evolved throughout its history as the field changed from industrial arts to technology education (Spencer & Rogers, 2006). With the move to technology education, the field has begun to broaden its focus to better understand the teaching, learning, curriculum, and policy implications of preparing the next generation of technological thinkers. Although a complete “paradigm shift” may not have occurred completely within all technology-oriented programs (Sanders, 2001), the current emphasis on engineering within technology education indicates a need to examine and assess the status of technology education research over the past ten years …
Resources: Getting There - Space, Todd R. Kelley
Resources: Getting There - Space, Todd R. Kelley
Publications
The article presents a school activity about transportation concepts using the DVD "Black Sky: The Race for Space & Winning the X-Prize." The article describes the video as a good resource to explore novel ideas in space travel with students. It suggests that the video inspires students to learn more about space transportation and the science and technology of modern rocketry.
Planning For College: A Comprehensive Guide For South Carolina Families, 2008, Catherine E. Watt
Planning For College: A Comprehensive Guide For South Carolina Families, 2008, Catherine E. Watt
Publications
No abstract provided.
Globalization: Winners And Losers - Talking Points, Derek Wilmott
Globalization: Winners And Losers - Talking Points, Derek Wilmott
Publications
Supporters of free trade argue that globalization increases economic prosperity as well as opportunity, especially among developing nations. Critics argue that globalization has led to the exploitation of both workers and the environment, while contributing to the destabilization of undeveloped nations. Can free trade enhance civil liberties, lead more efficient allocation of resources, and increase prosperity through globalization? Or are the critics right?
Parametric Probability Densities And Distribution Functions For Tukey G-And-H Transformations And Their Use For Fitting Data, Todd C. Headrick, Rhonda K. Kowalchuk, Yanyan Sheng
Parametric Probability Densities And Distribution Functions For Tukey G-And-H Transformations And Their Use For Fitting Data, Todd C. Headrick, Rhonda K. Kowalchuk, Yanyan Sheng
Publications
The family of g-and-h transformations are popular algorithms used for simulating non-normal distributions because of their simplicity and ease of execution. In general, two limitations associated with g-and-h transformations are that their probability density functions (pdfs) and cumulative distribution functions (cdfs) are unknown. In view of this, the g-and-h transformations’ pdfs and cdfs are derived in general parametric form. Moments are also derived and it is subsequently shown how the g and h parameters can be determined for prespecified values of skew and kurtosis. Numerical examples and parametric plots of g-and-h pdfs …
Them That Has, Gets, Daria Roithmayr
Spectrum Policy Reform And The Next Frontier Of Property Rights, Philip J. Weiser, Dale N. Hatfield
Spectrum Policy Reform And The Next Frontier Of Property Rights, Philip J. Weiser, Dale N. Hatfield
Publications
The scarcity of wireless spectrum reflects a costly failure of regulation. In practice, large swaths of spectrum are vastly underused or used for low value activities, but the regulatory system prevents innovative users from gaining access to such spectrum through marketplace transactions. In calling for the propertyzing of swaths of spectrum as a replacement for the current command-and-control system, many scholars have wrongfully assumed the simplicity of how such a regime would work in practice. In short, many scholars suggest that spectrum property rights can easily borrow key principles from trespass law, reasoning that since property rights work well for …
How Do Securities Laws Influence Affect, Happiness, & Trust?, Peter H. Huang
How Do Securities Laws Influence Affect, Happiness, & Trust?, Peter H. Huang
Publications
This Article advocates that securities regulators promulgate rules based upon taking into consideration their impacts upon investors' and others' affect, happiness, and trust. Examples of these impacts are consumer optimism, financial stress, anxiety over how thoroughly securities regulators deliberate over proposed rules, investor confidence in securities disclosures, market exuberance, social moods, and subjective well-being. These variables affect and are affected by traditional financial variables, such as consumer debt, expenditures, and wealth; corporate investment; initial public offerings; and securities market demand, liquidity, prices, supply, and volume. This Article proposes that securities regulators can and should evaluate rules based upon measures of …
Dunya, Marianne Wesson
Book Review: Mac Os X, Ipod, And Iphone Forensic Analysis Dvd Toolkit, Gary C. Kessler
Book Review: Mac Os X, Ipod, And Iphone Forensic Analysis Dvd Toolkit, Gary C. Kessler
Publications
This document is Dr. Kessler's review of MAC OS X, iPod, and iPhone Forensic Analysis DVD Toolkit, edited by Jesse Varsalone. Syngress, 2009. ISBN: 978-1-59749-297-3.
Book Review: The Dotcrime Manifesto: How To Stop Internet Crime, Gary C. Kessler
Book Review: The Dotcrime Manifesto: How To Stop Internet Crime, Gary C. Kessler
Publications
This document is Dr. Kessler's review of The dotCrime Manifesto: How to Stop Internet Crime, by Phillip Hallam-Baker. Addison-Wesley, 2008. ISBN: 0-321-50358-9
The Identification And Verification Of Hazardous Convective Cells Over Oceans Using Visible And Infrared Satellite Observations, Michael F. Donovan, Earle R. Williams, Cathy Kessinger, Gary Blackburn, Paul H. Herzegh, Richard L. Bankert, Steve Miller, Frederick R. Mosher
The Identification And Verification Of Hazardous Convective Cells Over Oceans Using Visible And Infrared Satellite Observations, Michael F. Donovan, Earle R. Williams, Cathy Kessinger, Gary Blackburn, Paul H. Herzegh, Richard L. Bankert, Steve Miller, Frederick R. Mosher
Publications
Three algorithms based on geostationary visible and infrared (IR) observations are used to identify convective cells that do (or may) present a hazard to aviation over the oceans. The performance of these algorithms in detecting potentially hazardous cells is determined through verification with Tropical Rainfall Measuring Mission (TRMM) satellite observations of lightning and radar reflectivity, which provide internal information about the convective cells. The probability of detection of hazardous cells using the satellite algorithms can exceed 90% when lightning is used as a criterion for hazard, but the false-alarm ratio with all three algorithms is consistently large (40%), thereby exaggerating …
On Existence And Uniqueness Results For The Bbm Equation With Arbitrary Forcing Terms, Timothy A. Smith
On Existence And Uniqueness Results For The Bbm Equation With Arbitrary Forcing Terms, Timothy A. Smith
Publications
The problem of classical solutions for the regularized long-wave equation is considered where various additional forcing terms are introduced which are often required for physical modifications in the wave theory. Sufficient conditions of solvability and existence are established and then these conditions are related to the structure of the forcing terms under consideration.
Models Of Phototransduction In Rod Photoreceptors, Harihar Khanal, Vasilios Alexiades
Models Of Phototransduction In Rod Photoreceptors, Harihar Khanal, Vasilios Alexiades
Publications
Phototransduction is the process by which photons of light generate an electrical response in retinal rod and cone photoreceptors, thereby initiating vision. We compare the electrical response in salamander rods from increasingly more (spacialy) detailed models of phototransduction: 0-dimensional (bulk), 1-dimensional (longitudinal), 2-dimensional (axisymmetric), and 3-dimensional (with incisures). We discuss issues of finding physical parameters for simulation and validation of models, and also present some computational experiments for rods with geometry of mouse and human photoreceptors.
Book Review: Challenges To Digital Forensic Evidence, Gary C. Kessler
Book Review: Challenges To Digital Forensic Evidence, Gary C. Kessler
Publications
This document is Dr. Kessler's review of Challenges to Digital Forensic Evidence, by Fred Cohen. Fred Cohen & Associates, 2008. ISBN 1-878109-41-3
White Dwarf Luminosity And Mass Functions From Sloan Digital Sky Survey Spectra, Steven Degennaro, Ted Von Hippel, D. E. Winget, S. O. Kepler, Atsuko Nitta, Detlev Koester, Leandro Althaus
White Dwarf Luminosity And Mass Functions From Sloan Digital Sky Survey Spectra, Steven Degennaro, Ted Von Hippel, D. E. Winget, S. O. Kepler, Atsuko Nitta, Detlev Koester, Leandro Althaus
Publications
We present the first phase in our ongoing work to use Sloan Digital Sky Survey (SDSS) data to create separate white dwarf (WD) luminosity functions (LFs) for two or more different mass ranges. In this paper, we determine the completeness of the SDSS spectroscopic WD sample by comparing a proper-motion selected sample of WDs from SDSS imaging data with a large catalog of spectroscopically determined WDs. We derive a selection probability as a function of a single color (g − i) and apparent magnitude (g) that covers the range −1.0 < g − i < 0.2 and 15 < g < 19.5. We address the observed upturn in log g for WDs with Teff 12,000 K and offer arguments that the problem is limited to the line profiles and is not present in the continuum. We offer an empirical method of removing the upturn, recovering a reasonable mass function for WDs with Teff < 12,000 K. Finally we present a WD LF with nearly an order of magnitude (3358) more spectroscopically confirmed WDs than any previous work.
A Process Plan For Consensus Building In The Evaluation Of Nsgc & Epscor Native American Outreach Program, Jocelyn S. Nickerson, Brent D. Bowen, Henry R. Lehrer
A Process Plan For Consensus Building In The Evaluation Of Nsgc & Epscor Native American Outreach Program, Jocelyn S. Nickerson, Brent D. Bowen, Henry R. Lehrer
Publications
The NASA Nebraska Space Grant (NSGC) & EPSCoR Programs at the University of Nebraska at Omaha have embarked on a unique educational journey known as the Nebraska Native American Outreach program (NNAOP). The NNAOP’s main objective is to encourage and motivate Native American students to be more competitive in mathematics and science. This program has allowed for a variety of educational and public outreach activities to take place. However, in order to continually provide effective support to Nebraska’s Native American community, NSGC & EPSCoR sought an evaluation technique for the NNAOP. To execute such an evaluation, NSGC organized the first …
Book Review: The Telescope: Its History, Technology, And Future, T. D. Oswalt
Book Review: The Telescope: Its History, Technology, And Future, T. D. Oswalt
Publications
This document is Dr. Oswalt’s review of The Telescope : Its History, Technology, and Future by Geoff Andersen. Princeton, 2007 248p, 0691129797 $29.95, 9780691129792 $29.95.
Book Review: Your Cosmic Context: An Introduction To Modern Cosmology, T. D. Oswalt
Book Review: Your Cosmic Context: An Introduction To Modern Cosmology, T. D. Oswalt
Publications
This document is Dr. Oswalt’s review of Your Cosmic Context : an Introduction to Modern Cosmology by Todd Duncan and Craig Tyler Pearson Addison-Wesley, 2008 466p, 0132400103 $80.00, 9780132400107 $80.00.
Optical Estimation Of Auroral Ion Upflow: Theory, M. Zettergren, J. L. Semeter, P. L. Blelly, M. Diaz
Optical Estimation Of Auroral Ion Upflow: Theory, M. Zettergren, J. L. Semeter, P. L. Blelly, M. Diaz
Publications
This work presents a systematic analysis of optical emissions related to auroral ion upflow. Optical intensities and field‐aligned ion transport are computed for a set of monoenergetic incident electron beams using a combined fluid‐kinetic model. The kinetic portion models the energetic particle transport with a multiple stream approach and provides ionization, excitation, and heating rates to an eight‐moment fluid model of the ionosphere, which then calculates the resulting ion upflow. The analysis is used to develop a technique for estimating upward ion flux from photometric measurements at five discrete wavelengths: 427.8 nm, 557.7 nm, 630.0 nm, 732 nm, and 844.6 …
The General Relativistic Infinite Plane, Preston Jones, Gerardo Muñoz, Michael Ragsdale, Douglas Singleton
The General Relativistic Infinite Plane, Preston Jones, Gerardo Muñoz, Michael Ragsdale, Douglas Singleton
Publications
Uniform fields are one of the simplest and most pedagogically useful examples in introductory courses on electrostatics or Newtonian gravity. In general relativity there have been several proposals as to what constitutes a uniform field. In this article we examine two metrics that can be considered the general relativistic version of the infinite plane with finite mass per unit area. The first metric is the 4D version of the 5D “brane” world models which are the starting point for many current research papers. The second case is the cosmological domain wall metric. We examine to what extent these different metrics …
Constraints On An Optical Afterglow And On Supernova Light Following The Short Burst Grb 050813, P. Ferreo, S. F. Sanchez, D. A. Kann, S. Klose, J. Greiner, J. Gorosabel, Dieter H. Hartmann, A. A. Henden, P. Møller, E. Palazzi
Constraints On An Optical Afterglow And On Supernova Light Following The Short Burst Grb 050813, P. Ferreo, S. F. Sanchez, D. A. Kann, S. Klose, J. Greiner, J. Gorosabel, Dieter H. Hartmann, A. A. Henden, P. Møller, E. Palazzi
Publications
We report early follow-up observations of the error box of the short burst GRB 050813 using the telescopes at Calar Alto and Observatorio Sierra Nevada, followed by deep VLT FORS2 I-band observations obtained under very good seeing conditions 5.7 and 11.7 days after the event. Neither a fading afterglow nor a rising SN component was found, so the potential GRB host galaxy has not been identified based on a comparison of the two VLT images taken at different epochs. We discuss whether any of the galaxies present in the original 1000 XRTerror circle could be the host.In anycase, the optical …
Optimization Of Electrostatic Interactions In Protein-Protein Complexes, Kelly Brock, Kemper Talley, Kacey Coley, Petras Kundrotas, Emil Alexov
Optimization Of Electrostatic Interactions In Protein-Protein Complexes, Kelly Brock, Kemper Talley, Kacey Coley, Petras Kundrotas, Emil Alexov
Publications
In this article, we present a statistical analysis of the electrostatic properties of 298 protein-protein complexes and 356 domain-domain structures extracted from the previously developed database of protein complexes (ProtCom, http://www.ces.clemson.edu/compbio/protcom). For each structure in the dataset we calculated the total electrostatic energy of the binding and its two components, Coulombic and reaction field energy. It was found that in a vast majority of the cases (>90%), the total electrostatic component of the binding energy was unfavorable. At the same time, the Coulombic component of the binding energy was found to favor the complex formation while …
Electromagnetic Radiation From Temporal Variations In Space-Time And Progenitors Of Gamma Ray Burst And Millisecond Pulsars, Preston Jones
Electromagnetic Radiation From Temporal Variations In Space-Time And Progenitors Of Gamma Ray Burst And Millisecond Pulsars, Preston Jones
Publications
A time varying space–time metric is shown to be a source of electromagnetic radiation even in the absence of charge sources. The post-Newtonian approximation is used as a realistic model of the connection between the space–time metric and a time-varying gravitational potential. Rapid temporal variations in the metric from the coalescence of relativistic stars are shown to be likely progenitors of gamma ray burst and millisecond pulsars.
On Enumeration Of Conjugacy Classes Of Coxeter Elements, Matthew Macauley, Henning S. Mortveit
On Enumeration Of Conjugacy Classes Of Coxeter Elements, Matthew Macauley, Henning S. Mortveit
Publications
In this paper we study the equivalence relation on the set of acyclic orientations of a graph Y that arises through source-to-sink conversions. This source-to-sink conversion encodes, e.g. conjugation of Coxeter elements of a Coxeter group. We give a direct proof of a recursion for the number of equivalence classes of this relation for an arbitrary graph Y using edge deletion and edge contraction of non-bridge edges. We conclude by showing how this result may also be obtained through an evaluation of the Tutte polynomial as T (Y, 1, 0), and we provide bijections to two other classes of acyclic …
Models Of Interdisciplinary Research And Service Learning At Hope College, Aaron A. Best, Matthew Dejongh, Amanda J. Barton, Jeff R. Brown, Christopher C. Barney
Models Of Interdisciplinary Research And Service Learning At Hope College, Aaron A. Best, Matthew Dejongh, Amanda J. Barton, Jeff R. Brown, Christopher C. Barney
Publications
"Children love to explore the world around them. In doing so they are not aware of disciplinary boundaries or even of disciplines. They move freely from watching ants (biology) to building structures (engineering) to counting rocks (mathematics and geology) to seeing what things dissolve in water (chemistry). Only as they go to school do they learn that humans divide up the way we learn about the universe and start to think within disciplinary boundaries. In doing so, those children, who are now us, lose the ability to think broadly and use the insights of various ways of thinking to solve …
Enhancement Of Nd: Yag Libs Emission Of A Remote Target Using A Simultaneous Co/Sub 2/ Laser Pulse, Dennis K. Killinger, Susan D. Allen, Robert D. Waterbury, Chris Stefano, Edwin L. Dottery
Enhancement Of Nd: Yag Libs Emission Of A Remote Target Using A Simultaneous Co/Sub 2/ Laser Pulse, Dennis K. Killinger, Susan D. Allen, Robert D. Waterbury, Chris Stefano, Edwin L. Dottery
Publications
For the first time to the best of our knowledge, a simultaneous 10.6 μm CO2 laser pulse has been used to enhance the Laser Induced Breakdown Spectroscopy (LIBS) emission from a 1.064 μm Nd:YAG laser induced plasma on a hard target. The enhancement factor was on the order of 25 to 300 times, depending upon the emission lines observed. For an alumina ceramic substrate the Al emission lines at 308 nm and Fe impurity line at 278 nm showed an increase of 60x and 119x, respectively. The output energy of the Nd:YAG laser was 50 mJ/pulse focused to a 1 …
Shibboleth As A Tool For Authorized Access Control To The Subversion Repository System, Amy Apon, Linh B. Ngo
Shibboleth As A Tool For Authorized Access Control To The Subversion Repository System, Amy Apon, Linh B. Ngo
Publications
Shibboleth is an architecture and protocol for allowing users to authenticate and be authorized to use a remote resource by logging into the identity management system that is maintained at their home institution. With Shibboleth, a federation of institutions can share resources among users and yet allow the administration of both the user access control to resources and the user identity and attribute information to be performed at the hosting or home institution. Subversion is a version control repository system that allows the creation of fine-grained permissions to files and directories. In this project an infrastructure, Shibbolized Subversion, has been …
Shibboleth As A Tool For Authorized Access Control To The Subversion Repository System, Linh B. Ngo, Amy W. Apon
Shibboleth As A Tool For Authorized Access Control To The Subversion Repository System, Linh B. Ngo, Amy W. Apon
Publications
Shibboleth is an architecture and protocol for allowing users to authenticate and be authorized to use a remote resource by logging into the identity management system that is maintained at their home institution. With Shibboleth, a federation of institutions can share resources among users and yet allow the administration of both the user access control to resources and the user identity and attribute information to be performed at the hosting or home institution. Subversion is a version control repository system that allows the creation of fine-grained permissions to files and directories. In this project an infrastructure, Shibbolized Subversion, has been …
Book Review: Moore On Mercury: The Planet And The Missions, T. D. Oswalt
Book Review: Moore On Mercury: The Planet And The Missions, T. D. Oswalt
Publications
This document is Dr. Oswalt’s review of Moore on Mercury : the Planet and the Missions by Patrick Moore. Springer, 2006 139p, 1846282578 $29.95, 9781846282577 $29.95