5,921 research outputs found
An anomalous magnetic phase transition at 10 K in Nd7Rh3
The compound, Nd7Rh3, crystallizing in Th7Fe3-type hexagonal structure, has
been shown recently by us to exhibit a signature of magnetic phase-coexistence
phenomenon below 10 K after a field cycling, uncharacteristic of stoichiometric
intermetallic compounds, bearing a relevance to the trends in the field of
electronic phase-separation. In order to characterize this compound further, we
have carried out dc magnetic susceptibility (chi), electrical resistivity,
magnetoresistance and heat-capacity measurements as a function temperature (T=
1.8 to 300 K). The results reveal that this compound exhibits another unusual
finding at the 10K-transition in the sense that the plot of chi(T) shows a
sharp increase in the field-cooled cycle, whereas the zero-field-cooled curve
shows a downturn below the transition. In addition, the sign of
magnetoresistance is negative and the magnitude is large over a wide
temperature range in the vicinity of magnetic ordering temperature, with a
sharp variation at 10 K. The results indicate that the transition below 10 K is
first-order in its character.Comment: Appeared in JPCM (Letters) 18 (2006) L40
PCV35 IMPACT OF NESIRITIDE ON TREATMENT OF ACUTE DECOMPENSATED HEART FAILURE (ADHF): EVIDENCE FROM A US HOSPITAL DATABASE
Parallel Transport over Path Spaces
We develop a differential geometric framework for parallel transport over
path spaces and a corresponding discrete theory, an integrated version of the
continuum theory, using a category-theoretic framework.Comment: 27pp 3fig pdflatex only; v2: rewritten with several clarifications;
v3: minor changes, added references. Version to be published, 30p
Coarse-graining microscopic strains in a harmonic, two-dimensional solid and its implications for elasticity: non-local susceptibilities and non-affine noise
In soft matter systems the local displacement field can be accessed directly
by video microscopy enabling one to compute local strain fields and hence the
elastic moduli using a coarse-graining procedure. We study this process for a
simple triangular lattice of particles connected by harmonic springs in
two-dimensions. Coarse-graining local strains obtained from particle
configurations in a Monte Carlo simulation generates non-trivial, non-local
strain correlations (susceptibilities), which may be understood within a
generalized, Landau type elastic Hamiltonian containing up to quartic terms in
strain gradients (K. Franzrahe et al., Phys. Rev. E 78, 026106 (2008)). In
order to demonstrate the versatility of the analysis of these correlations and
to make our calculations directly relevant for experiments on colloidal solids,
we systematically study various parameters such as the choice of statistical
ensemble, presence of external pressure and boundary conditions. We show that
special care needs to be taken for an accurate application of our results to
actual experiments, where the analyzed area is embedded within a larger system,
to which it is mechanically coupled. Apart from the smooth, affine strain
fields, the coarse-graining procedure also gives rise to a noise field made up
of non-affine displacements. Several properties of this noise field may be
rationalized for the harmonic solid using a simple "cell model" calculation.
Furthermore the scaling behavior of the probability distribution of the noise
field is studied and a master curve is obtained.Comment: 16 pages, 12 figure
The Relationship Between Pulse Count and Energy Expenditure at Submaximal Work Under Different Ambient Temperatures
Studies were carried out in on six soldiers to evaluate the energy expenditure submaximal work under three environmental temperatures of 22 degree C, 30 Degree C. The subjects were given a standard graded exercise of varying work loads from 200 to 600 kgm/mim on a bicycle ergometer. Pulse count, pulmonary ventilation, oxygen consumption, carbon dioxide elimination and breathing frequency were measured during rest and at each work load. Results indicated that oxygen consumption was not influenced by environment, whereas. pulse count was significantly influenced by environment, being highest for subjects at 37 degree C (P<0.01). The findings of the present study assess the likely effect of variation in environmental temperatures between 22 Degree C and 30 degree C, 22 degree C and 37 Degree C and 30 Degree C and 37 Degree C on the physiological respones to the submaximal type of exercise
Geometric Frustration and Dimensional Reduction at a Quantum Critical Point
We show that the spatial dimensionality of the quantum critical point
associated with Bose--Einstein condensation at T=0 is reduced when the
underlying lattice comprises a set of layers coupled by a frustrating
interaction. Our theoretical predictions for the critical temperature as a
function of the chemical potential correspond very well with recent
measurements in BaCuSiO [S. E. Sebastian \textit{et al}, Nature
\textbf{411}, 617 (2006)].Comment: 5 pages, 2 figure
Analysis of colorectal cancers in British Bangladeshi identifies early onset, frequent mucinous histotype and a high prevalence of RBFOX1 deletion
PMCID: PMC3544714This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
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