111,821 research outputs found
A vectorized code for calculating laminar and turbulent hypersonic flows about blunt axisymmetric bodies at zero and small angles of attack
A user's guide is provided for a computer code which calculates the laminar and turbulent hypersonic flows about blunt axisymmetric bodies, such as spherically blunted cones, hyperboloids, etc., at zero and small angles of attack. The code is written in STAR FORTRAN language for the CDC-STAR-100 computer. Time-dependent, viscous-shock-layer-type equations are used to describe the flow field. These equations are solved by an explicit, two-step, time asymptotic, finite-difference method. For the turbulent flow, a two-layer, eddy-viscosity model is used. The code provides complete flow-field properties including shock location, surface pressure distribution, surface heating rates, and skin-friction coefficients. This report contains descriptions of the input and output, the listing of the program, and a sample flow-field solution
The K1.8BR spectrometer system at J-PARC
A new spectrometer system was designed and constructed at the secondary beam
line K1.8BR in the hadron hall of J-PARC to investigate interactions
and -nuclear bound systems. The spectrometer consists of a high
precision beam line spectrometer, a liquid He/He/D target system, a
Cylindrical Detector System that surrounds the target to detect the decay
particles from the target region, and a neutron time-of-flight counter array
located 15 m downstream from the target position. Details of the design,
construction, and performance of the detector components are described.Comment: 33 pages, 25 figure
Phase diagram and spin Hamiltonian of weakly-coupled anisotropic S=1/2 chains in CuCl2*2((CD3)2SO)
Field-dependent specific heat and neutron scattering measurements were used
to explore the antiferromagnetic S=1/2 chain compound CuCl2 * 2((CD3)2SO). At
zero field the system acquires magnetic long-range order below TN=0.93K with an
ordered moment of 0.44muB. An external field along the b-axis strengthens the
zero-field magnetic order, while fields along the a- and c-axes lead to a
collapse of the exchange stabilized order at mu0 Hc=6T and mu0 Hc=3.5T,
respectively (for T=0.65K) and the formation of an energy gap in the excitation
spectrum. We relate the field-induced gap to the presence of a staggered
g-tensor and Dzyaloshinskii-Moriya interactions, which lead to effective
staggered fields for magnetic fields applied along the a- and c-axes.
Competition between anisotropy, inter-chain interactions and staggered fields
leads to a succession of three phases as a function of field applied along the
c-axis. For fields greater than mu0 Hc, we find a magnetic structure that
reflects the symmetry of the staggered fields. The critical exponent, beta, of
the temperature driven phase transitions are indistinguishable from those of
the three-dimensional Heisenberg magnet, while measurements for transitions
driven by quantum fluctuations produce larger values of beta.Comment: revtex 12 pages, 11 figure
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The Active Schools Movement: Helping to Create Comprehensive School Physical Activity Programs in All K-12 Schools
Physical activity has many health, social, and academic benefits for youth (United States Department of Health and Human Services [USDHHS], 2008). It can help children and adolescents improve cardiorespiratory fitness, build strong bones and muscles, maintain a healthy weight, reduce symptoms of anxiety and depression, and reduce the risk of developing health conditions such as obesity, Type II diabetes, and other chronic diseases. Additionally, students who are physically active tend to have better school attendance, classroom behaviors, cognitive performance, and grades (Centers for Disease Control and Prevention [CDC], 2018).Educatio
Enhancing project-related behavioral competence in education
The workforce has increasingly been demanding an educational model that produces students experienced in real project management (PM) practices. This includes producing technically competent students--one who can manage real-world project constraints of cost and schedule but also possess critical project related behavioral competence. Such soft skills are essential if a project is to run smoothly and eventually succeed. In this paper, we describe an educational framework grounded in outcomes based education to enhance project-related behavioral competence. Instructors can leverage this framework to augment their existing courses and develop the critical career skill sets of graduating students
Going Comprehensive: Anatomy of an Initiative That Worked -- CCRP in the South Bronx
Traces the story of the Comprehensive Community Revitalization Program (CCRP), a model approach to neighborhood redevelopment in the South Bronx that operated in concert with local nonprofit community development corporations
Event Planner Sensitivity to the Needs of Individuals with Visual Disability at Meetings and Events
Special events, such as fairs, conventions, ballgames, and concerts are typically activities people attend to participate in the festivities and enjoy with friends and family members. For individuals with disabilities, however, these types of events can create more challenges than enjoyment. Despite a thorough review of the literature, no studies were found which evaluated the experiences of individuals who are blind and have visual impairments at events and meetings. The aim of this study was to determine the current level of accessibility at meetings perceived by consumers who are blind and visually impaired. Respondents to the survey indicated many obstacles to accessing meetings including: discrimination, a paucity of accessible features, and accessibility features that are not truly accessible for consumers who are blind and visually impaired. Recommendations are provided for increasing meeting and event accessibility for consumers who are blind and visually impaired
The U.S. Government's Global Health Policy Architecture: Structure, Programs and Funding
Provides an overview of the history, scope, and role of U.S. engagement in global health, including funding; statutes, authorities, and policies; agencies involved; major initiatives; and countries with U.S. bilateral programs and funding
The S=1/2 chain in a staggered field: High-energy bound-spinon state and the effects of a discrete lattice
We report an experimental and theoretical study of the antiferromagnetic
S=1/2 chain subject to uniform and staggered fields. Using inelastic neutron
scattering, we observe a novel bound-spinon state at high energies in the
linear chain compound CuCl2 * 2((CD3)2SO). The excitation is explained with a
mean-field theory of interacting S=1/2 fermions and arises from the opening of
a gap at the Fermi surface due to confining spinon interactions. The mean-field
model also describes the wave-vector dependence of the bound-spinon states,
particularly in regions where effects of the discrete lattice are important. We
calculate the dynamic structure factor using exact diagonalization of finite
length chains, obtaining excellent agreement with the experiments.Comment: 16 pages, 7 figures, accepted by Phys. Rev.
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