1,219 research outputs found
Do We Need to Put God into Emotional Support?: A Comparison of Caucasians’ and African-Americans’ Evaluations of Religious versus Non-Religious Comforting Messages
The current study explored whether ethnicity influences young adults’ evaluations of two different sets of comforting messages: those in which concepts such as God, prayer, religion, and faith are woven into low, moderate, and high person-centered strategies (called ‘‘religious strategies’’) and those in which such concepts are not embedded (called ‘‘non-religious strategies’’) into the messages. One hundred ninety-seven college students (63% African-American; 37% Caucasian) rated the sensitivity and effectiveness of religious and non-religious comforting messages. Several significant differences were observed between Caucasians and African-Americans in their evaluations of these strategies. Findings are discussed in terms of their practical implications for ‘‘real world’’ comforting efforts as well as the theoretical significance they hold for the concept of person-centeredness
OCS in small para-hydrogen clusters: energetics and structure with N=1-8 complexed hydrogen molecules
We determine the structure and energetics of complexes of the linear OCS
molecule with small numbers of para-hydrogen molecules, N=1-8, using zero
temperature quantum Monte Carlo methods. Ground state calculations are carried
out with importance-sampled rigid body diffusion Monte Carlo (IS-RBDMC) and
excited state calculations with the projection operator imaginary time spectral
evolution (POITSE) methodology. The ground states are found to be highly
structured, with a gradual build up of two axial rings as N increases to 8.
Analysis of the azimuthal density correlations around the OCS molecule shows
that these rings are quite delocalized for small N values, but become strongly
localized for N \geq 5 . Excited state calculations are made for a range of
total cluster angular momentum values and the rotational energy levels fitted
to obtain effective rotational and distortion constants of the complexed OCS
molecule as a function of cluster size N. Detailed analysis of these
spectroscopic constants indicates that the complexes of OCS with para-hydrogen
have an unusually rich variation in dynamical behavior, with sizes N=1-2
showing near rigid behavior, sizes N=3-4 showing extremely floppy behavior, and
the larger sizes N=5-8 showing more rigid behavior again. The large values of
the distortion constant D obtained for N=3-4 are rationalized in terms of the
coupling between the OCS rotations and the "breathing" mode of the first,
partially filled ring of para-hydrogen molecules.Comment: 26 pages, 11 figures. accepted for publication in the Journal of
Chemical Physic
Snap-8 mercury corrosion and materials research, volume iii topical report, jun. 1960 - dec. 1962
SNAP-8 materials research - mercury corrosion capsule tests of ferritic alloys for mass transfer, stress corrosion, mode of attack, and mechanical propertie
Multi-particle decoherence free subspaces in extended systems
We develop a method to determine spatial configurations to realize decoherence-free subspaces for spatially extended multi-particle systems. We have assumed normal reservoir behavior including translational invariance of the reservoir and preparation in stationary states or mixture thereof and weak Markovian system-reservoir coupling that requires energy transfer. One important outcome of our method is a proof that there does not exist a multi-particle decoherence-free subspace in such systems except in the limit that the spatial extent of the system becomes infinitesimal
The Anthropometry of Forest Machine Operators in the Southern USA
Anthropometric dimensions critical to the design of operator workspaces and cab access in grapple skidders were collected from a sample of Southern United States loggers. The data were then compared to existing SAE and ILO anthropometric recommendations and data. Results indicated that southern grapple skidder operators are generally taller in stature, sitting height and seated eye height than the worldwide population measured to determine the SAE and ILO guides. Southern operators are also heavier than subjects measured for the SAE recommendations
Quantum phases of dipolar rotors on two-dimensional lattices
The quantum phase transitions of dipoles confined to the vertices of two
dimensional (2D) lattices of square and triangular geometry is studied using
path integral ground state quantum Monte Carlo (PIGS). We analyze the phase
diagram as a function of the strength of both the dipolar interaction and a
transverse electric field. The study reveals the existence of a class of
orientational phases of quantum dipolar rotors whose properties are determined
by the ratios between the strength anisotropic dipole-dipole interaction, the
strength of the applied transverse field, and the rotational constant. For the
triangular lattice, the generic orientationally disordered phase found at zero
and weak values of both dipolar interaction strength and applied field, is
found to show a transition to a phase characterized by net polarization in the
lattice plane as the strength of the dipole-dipole interaction is increased,
independent of the strength of the applied transverse field, in addition to the
expected transition to a transverse polarized phase as the electric field
strength increases. The square lattice is also found to exhibit a transition
from a disordered phase to an ordered phase as the dipole-dipole interaction
strength is increased, as well as the expected transition to a transverse
polarized phase as the electric field strength increases. In contrast to the
situation with a triangular lattice, on square lattices the ordered phase at
high dipole-dipole interaction strength possesses a striped ordering. The
properties of these quantum dipolar rotor phases are dominated by the
anisotropy of the interaction and provide useful models for developing quantum
phases beyond the well-known paradigms of spin Hamiltonian models, realizing in
particular a novel physical realization of a quantum rotor-like Hamiltonian
that possesses an anisotropic long range interaction.Comment: Updated credit line and changed line spacin
Analytic, Group-Theoretic Density Profiles for Confined, Correlated N-Body Systems
Confined quantum systems involving identical interacting particles are to
be found in many areas of physics, including condensed matter, atomic and
chemical physics. A beyond-mean-field perturbation method that is applicable,
in principle, to weakly, intermediate, and strongly-interacting systems has
been set forth by the authors in a previous series of papers. Dimensional
perturbation theory was used, and in conjunction with group theory, an analytic
beyond-mean-field correlated wave function at lowest order for a system under
spherical confinement with a general two-body interaction was derived. In the
present paper, we use this analytic wave function to derive the corresponding
lowest-order, analytic density profile and apply it to the example of a
Bose-Einstein condensate.Comment: 15 pages, 2 figures, accepted by Physics Review A. This document was
submitted after responding to a reviewer's comment
Electrical activation and electron spin coherence of ultra low dose antimony implants in silicon
We implanted ultra low doses (2x10^11 cm-2) of 121Sb ions into isotopically
enriched 28Si and find high degrees of electrical activation and low levels of
dopant diffusion after rapid thermal annealing. Pulsed Electron Spin Resonance
shows that spin echo decay is sensitive to the dopant depths, and the interface
quality. At 5.2 K, a spin decoherence time, T2, of 0.3 ms is found for profiles
peaking 50 nm below a Si/SiO2 interface, increasing to 0.75 ms when the surface
is passivated with hydrogen. These measurements provide benchmark data for the
development of devices in which quantum information is encoded in donor
electron spins
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