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Newport News, VA, United States

Christopher Newport University, or CNU, is a public liberal arts university located in Newport News, Virginia, United States. CNU is the youngest comprehensive university in the commonwealth of Virginia. The institution is named after Christopher Newport, who was a buccaneer and captain of the Susan Constant, the largest of three ships that carried settlers for the Virginia Company in 1607 on the way to find the settlement at Jamestown in the Virginia Colony, which became the first permanent English settlement in North America. Wikipedia.

Lee T.,Christopher Newport University
Gerontology and Geriatrics Education | Year: 2012

The article theorizes that augmenting traditional humanities course work with documentary video-making can enhance and motivate learning. The English class profiled focused on aging and the lives of elders in an adult daycare center and a retirement community. Students documented elders' stories in video over 15 weeks. The instructor's goal was to use the immediacy of video to challenge and dismantle ageist stereotypes. Documentary video-making is a simple, and enticing, technology that gives students a powerful tool for getting to know elders. Scholarship on classroom uses of digital video-making is discussed, and critical comments from the five reflective essays students wrote during the semester are used to track changes in student perceptions of elders. © 2012 Copyright Taylor and Francis Group, LLC. Source

Bai Y.,Johnson C. Smith University | Wang D.,Christopher Newport University
IEEE Transactions on Fuzzy Systems | Year: 2010

This paper provides a comparison between a novel technique used for the pose-error measurements and compensations of robots based on a fuzzy-error interpolation method and some other popular interpolation methods. A traditional robot calibration implements either model or modeless methods. The measurement and compensation of pose errors in a modeless method moves the robots end-effector to the target poses in the robot workspace and measures the target position and orientation errors using some interpolation techniques in terms of the premeasured neighboring pose errors around the target pose. For the measurement purpose, a stereo camera or other measurement devices, such as a coordinate-measurement machine (CMM) or a laser-tracking system (LTS), can be used to measure the pose errors of the robots end-effector at predened grid points on a cubic lattice. By the use of the proposed fuzzy-error interpolation technique, the accuracy of the pose-error compensation can be improved in comparison with other interpolation methods, which is conrmed by the simulation results given in this paper. A comparison study among most popular interpolation methods used in modeless robot calibrations, such as trilinear, cubic spline, and the fuzzy-error interpolation technique, is also made and discussed via simulations. The simulation results show that more accurate measurement and compensation results can be achieved using the fuzzy-error interpolation technique compared with its trilinear and cubic-spline counterparts. © 2010 IEEE. Source

Dejong A.D.,Christopher Newport University | Dejong A.D.,Southwest Research Institute
Journal of Geophysical Research: Space Physics | Year: 2014

Using a new method to identify steady magnetospheric convection events (SMCs), a list of more than 2000 SMCs is compiled over the 11 years between 1997 and 2007. The SMCs are then categorized by the fluctuations in their AL. Active SMCs have large fluctuations in AL and therefore a less steady magnetosphere in terms of small-scale activity. Classic SMCs fall in the middle 50% for AL steadiness and represent the average of the SMCs. Calm SMCs have very little changes in AL and are the steadiest of the three categories. When investigating the solar wind drivers, it is found that the steadiness of the drivers is less important than the strength of the driving. Active SMCs have stronger drivers with the exception of Alfvenic Mach number and solar wind beta. The SYM-H of the three categories is also investigated for the approximate storm time conditions of the events. Calm SMCs rarely occur during storm time when SYM-H is less than -50 nT. If an SMC is identified during storm time, then it tends to be a more active event. ©2014. American Geophysical Union. All Rights Reserved. Source

Lindsay L.,Boston College | Lindsay L.,Christopher Newport University | Broido D.A.,Boston College | Mingo N.,CEA Grenoble | Mingo N.,University of California at Santa Cruz
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

We present a theory for the lattice thermal conductivity κL of multilayer graphene (MLG) and graphite, which is based on an exact numerical solution of the Boltzmann equation for phonons. Dominant contributions to κL from out-of-plane or flexural phonons are found, which is consistent with previous findings for single-layer graphene (SLG). However, the interaction between graphene layers in MLG and graphite breaks a selection rule on phonon-phonon scattering, causing their κLs to be much lower than that of SLG. C13 isotopes are shown to be an important scattering mechanism, accounting for an ∼15% additional drop in the κL of these systems. We demonstrate that the κL values converge to that of graphite after only about five layers, a consequence of weak interlayer coupling. These findings are qualitatively consistent with recent measurements of κL for MLG. © 2011 American Physical Society. Source

Badavi F.F.,Christopher Newport University
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2011

Ionizing radiation measurements at low earth orbit (LEO) form the ideal tool for the experimental validation of radiation environmental models, nuclear transport code algorithms and nuclear reaction cross sections. Indeed, prior measurements on the space transportation system (STS; shuttle) have provided vital information impacting both the environmental models and the nuclear transport code development by requiring dynamic models of the LEO environment. Previous studies using computer aided design (CAD) models of the international space station (ISS) have demonstrated that the dosimetric prediction for a spacecraft at LEO requires the description of an environmental model with accurate anisotropic as well as dynamic behavior. This paper describes such a model for the trapped proton. The described model is a component of a suite of codes collectively named GEORAD (GEOmagnetic RADiation) which computes cutoff rigidity, trapped proton and trapped electron environments. The web version of GEORAD is named OLTARIS (On-line Tool for the Assessment of Radiation in Space). GEORAD suite is applicable to radiation environment prediction at LEO, medium earth orbit (MEO) and geosynchronous earth orbit (GEO) at quiet solar periods. GEORAD interest is in the study of long term effect of the trapped environment and therefore it does not account for any short term external field contribution due to solar activity. With the concentration of the paper on the LEO protons only, the paper presents the validation of the trapped proton model within GEORAD with reported measurements from the compact environment anomaly sensor (CEASE) science instrument package, flown onboard the tri-service experiment-5 (TSX-5) satellite during the period of June 2000 to July 2006. The spin stabilized satellite was flown in a 410 × 1710 km, 69° inclination elliptical orbit, allowing it to be exposed to a broad range of the LEO regime. The paper puts particular emphasize on the validation of the differential at 40 MeV, and integral at >40 MeV proton flux profiles, in the vicinity of the south Atlantic anomaly (SAA) region where protons exhibit east-west (EW) anisotropy and have a relatively narrow pitch angle distribution. Within SAA, the EW anisotropy results in different level of exposure to different sections of a formation flying spacecraft such as TSX-5 or ISS. While the magnitude of the EW effect at LEO depends on a multitude of factors such as trapped proton energy, orientation of the spacecraft along the velocity vector and altitude of the spacecraft, the paper draws quantitative conclusions on the combined effect of proton pitch angle and EW anomaly. © 2011 Elsevier B.V. All rights reserved. Source

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