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Search Results: 1 - 10 of 20812 matches for " James Schafer "
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Automorphisms and cohomology
James A. Schafer
Mathematics , 2015,
Abstract: Let 1-> H -> G _> Q -> 1 be an exact sequence of groups. In the paper of R. Oliver and J. Ventura, TAMS,362(2009), the following exact sequence was developed for centric extensions, i.e the centralizer of H in G is contained in H, 0-> H^1(Q,zH) -> Aut(G,H) -> N_{Out H}(F Q)/F Q -> H^2(Q,zH) where Aut(G,H) are the automorphisms of G which restrict to an automorphism of H, F:Q -> Out H is the outer action determined by the extension, zH is the center of H with Q-action coming from F and N_{Out H} the normalizer. It is the aim of this paper to generalize the above sequence to arbitrary extensions, show how the above result is derived from the general exact sequence and derive other consequences of the general result including determining solvability of Aut(G,H).
PERCEPT Indoor Navigation System for the Blind and Visually Impaired: Architecture and Experimentation
Aura Ganz,James Schafer,Siddhesh Gandhi,Elaine Puleo
International Journal of Telemedicine and Applications , 2012, DOI: 10.1155/2012/894869
Cognitive awareness of carbohydrate intake does not alter exercise-induced lymphocyte apoptosis
Navalta, James Wilfred;McFarlin, Brian Keith;Lyons, Scott;Arnett, Scott Wesley;Schafer, Mark Anthony;
Clinics , 2011, DOI: 10.1590/S1807-59322011000200003
Abstract: objective: the purpose of this investigation was to determine whether cognitive awareness of carbohydrate beverage consumption affects exercise-induced lymphocyte apoptosis, independent of actual carbohydrate intake. introduction: carbohydrate supplementation during aerobic exercise generally protects against the immunosuppressive effects of exercise. it is not currently known whether carbohydrate consumption or simply the knowledge of carbohydrate consumption also has that effect. methods: endurance trained male and female (n = 10) athletes were randomly assigned to one of two groups based on either a correct or incorrect cognitive awareness of carbohydrate intake. in the incorrect group, the subjects were informed that they were receiving the carbohydrate beverage but actually received the placebo beverage. participants completed a 60-min ride on a cycle ergometer at 80% vo2peak under carbohydrate and placebo supplemented conditions. venous blood samples were collected at rest and immediately after exercise and were used to determine the plasma glucose concentration, lymphocyte count, and extent of lymphocyte apoptosis. cognitive awareness, either correct or incorrect, did not have an effect on any of the measured variables. results: carbohydrate supplementation during exercise did not have an effect on lymphocyte count or apoptotic index. independent of drink type, exercise resulted in significant lymphocytosis and lymphocyte apoptosis (apoptotic index at rest = 6.3 ± 3% and apoptotic index following exercise = 11.6 ± 3%, p<0.01). conclusion: neither carbohydrate nor placebo supplementation altered the typical lymphocyte apoptotic response following exercise. while carbohydrate supplementation generally has an immune-boosting effect during exercise, it appears that this influence does not extend to the mechanisms that govern exercise-induced lymphocyte cell death.
PERCEPT Indoor Navigation System for the Blind and Visually Impaired: Architecture and Experimentation
Aura Ganz,James Schafer,Siddhesh Gandhi,Elaine Puleo,Carole Wilson,Meg Robertson
International Journal of Telemedicine and Applications , 2012, DOI: 10.1155/2012/894869
Abstract: We introduce PERCEPT system, an indoor navigation system for the blind and visually impaired. PERCEPT will improve the quality of life and health of the visually impaired community by enabling independent living. Using PERCEPT, blind users will have independent access to public health facilities such as clinics, hospitals, and wellness centers. Access to healthcare facilities is crucial for this population due to the multiple health conditions that they face such as diabetes and its complications. PERCEPT system trials with 24 blind and visually impaired users in a multistory building show PERCEPT system effectiveness in providing appropriate navigation instructions to these users. The uniqueness of our system is that it is affordable and that its design follows orientation and mobility principles. We hope that PERCEPT will become a standard deployed in all indoor public spaces, especially in healthcare and wellness facilities. 1. Introduction The World Health Organization (2010) reported that globally the number of people of all ages visually impaired is estimated to be 285 million, of whom 39 million are blind [1]. Based on data from the 2004 National Health Interview Survey, 61 million Americans are considered to be at high risk of serious vision loss if they have diabetes, had a vision problem, or are over the age of 65 [2]. According to the American Diabetes Association diabetes is the leading cause of blindness in persons ages 20–74. An estimated 12,000 to 24,000 people lose their sight each year because of diabetes [3]. The Veteran Administration estimates that by 2020, there will be over 1 million Veterans with significant visual impairment and legal blindness. In addition, some 13 percent of the evacuated wounded service members in Iraq and Afghanistan have suffered a serious eye injury of one type or another [4]. The blind and visually impaired encounter serious problems in leading an independent life due to their reduced perception of the environment. New environments pose a huge challenge for them to perceive their surroundings without seeking help from others. Current training programs for blind and visually impaired people require them to memorize a large amount of information for numerous points of interest (i.e., university, shopping malls, bus terminals, etc.) leading to an increase in personal frustration. It is commonly accepted that the incapability of moving freely and independently can hinder the full integration of an individual into society [5]. Blindness, like other disabilities, affects one’s mobility and quality of life [6],
Disconnected contributions to hadronic structure
Sara Collins,Gunnar Bali,Andrea Nobile,Andreas Schafer,Yoshifumi Nakamura,James Zanotti
Physics , 2010,
Abstract: We present an update of an on-going project to determine the disconnected contributions to hadronic structure, specifically, the scalar matrix element and the quark contribution to the spin of the nucleon.
Assessing Community Health Needs in a Rural Area: Determining Best Practices to Meet New Affordable Care Act Requirements  [PDF]
Elizabeth Schafer, Rebecca Smullin Dawson
Health (Health) , 2015, DOI: 10.4236/health.2015.75064
Abstract: We conducted a review of the peer-reviewed literature focused on conducting community health needs assessments and highlighted the necessary steps to conduct a community health needs assessment in a rural community. From the literature review, we identified three steps necessary— establishing partnerships, using a mixed methods approach, and disseminating results—to successfully conduct a needs assessment that fitted the definition of the Affordable Care Act. These three steps have been used as a guide for developing a protocol for conducting a community health needs assessment in Meadville, PA. We detail our preliminary project protocol here.
Rate equations for nitrogen molecules in ultrashort and intense x-ray pulses
Ji-Cai Liu,Nora Berrah,Lorenz S. Cederbaum,James P. Cryan,James M. Glownia,Kenneth J. Schafer,Christian Buth
Physics , 2015,
Abstract: We study theoretically the molecular dynamics of nitrogen molecules (N$_2$) exposed to x rays at a wavelength of 1.1 nm (1100 eV photon energy) from the Linac Coherent Light Source (LCLS) free electron laser. Molecular rate equations are derived to describe the intertwined photoionization, decay, and dissociation processes occurring for N2 in intense and ultrafast x rays from LCLS. This model complements our earlier phenomenological approaches, the single-atom, symmetric-sharing, and fragmentation-matrix models of J. Chem. Phys. $\mathbf{136}$, 214310 (2012). Our rate-equations are used to obtain the effective pulse energy at the sample and the time scale for the dissociation of the metastable dication N$_2^{2+}$. This leads to a very good agreement between the theoretically and experimentally obtained ion yields and, consequently, the average charge states. The effective pulse energy is found to decrease with shortening pulse duration. This variation in the effective pulse energy together with a change in the molecular fragmentation pattern and the effect of frustrated absorption---an effect that reduces absorption of x rays due to (double) core hole formation---are the causes for the drop of the average charge state with shortening LCLS pulse duration discovered previously.
Workshop: Intellectual Property Rights Issues of Digital Publishing - Presence and Perspectives
Burkhard Schafer
SCRIPT-ed , 2005,
Abstract: This section of SCRIPT-ed contains the statements made at the FIGARO International Workshop: “Intellectual Property Rights Issues of Digital Publishing - Presence and Perspectives”, which was held at Hamburg University in September 2003.
Interplay between polarized DIS and RHIC spin physics
A. Schafer
Physics , 1995,
Abstract: The complementarity of polarized DIS experiments and polarized Proton-Proton experiments is illustrated for two examples. It is shown how the twist-3 part of the second moment of $g_2(x,Q^2)$ and the single-spin photon asymmetry are connected and it is discussed how the polarized gluon distribution can be obtained from the measurement of direct gamma asymmetries.
VUV frequency combs from below-threshold harmonics
Dylan C. Yost,Thomas R. Schibli,Jun Ye,Jennifer L. Tate,James Hostetter,Kenneth J. Schafer,Mette B. Gaarde
Physics , 2009, DOI: 10.1038/nphys1398
Abstract: Recent demonstrations of high-harmonic generation (HHG) at very high repetition frequencies (~100 MHz) may allow for the revolutionary transfer of frequency combs to the vacuum ultraviolet (VUV). This advance necessitates unifying optical frequency comb technology with strong-field atomic physics. While strong-field studies of HHG have often focused on above-threshold harmonic generation (photon energy above the ionization potential), for VUV frequency combs an understanding of below-threshold harmonic orders and their generation process is crucial. Here we present a new and quantitative study of the harmonics 7-13 generated below and near the ionization threshold in xenon gas. We show multiple generation pathways for these harmonics that are manifested as on-axis interference in the harmonic yield. This discovery provides a new understanding of the strong-field, below-threshold dynamics under the influence of an atomic potential and allows us to quantitatively assess the achievable coherence of a VUV frequency comb generated through below threshold harmonics. We find that under reasonable experimental conditions temporal coherence is maintained. As evidence we present the first explicit VUV frequency comb structure beyond the 3rd harmonic.
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