2,392 research outputs found
Probing Satellite Quenching With Galaxy Clustering
Satellites within simulated massive clusters are significantly spatially
correlated with each other, even when those satellites are not gravitationally
bound to each other. This correlation is produced by satellites that entered
their hosts relatively recently, and is undetectable for satellites that have
resided in their hosts for multiple dynamical timescales. Therefore, a
measurement of clustering statistics of cluster satellites may be used to
determine the typical accretion redshifts of those satellites into their
observed hosts. We argue that such measurements may be used to determine the
fraction of satellite galaxies that were quenched by their current hosts,
thereby discriminating among models for quenching of star formation in
satellite galaxies.Comment: 7 page
An EPR methodology for measuring the London penetration depth for the ceramic superconductors
The use is discussed of electron paramagnetic resonance (EPR) as a quick and easily accessible method for measuring the London penetration depth, lambda for the high T(sub c) superconductors. The method utilizes the broadening of the EPR signal, due to the emergence of the magnetic flux lattice, of a free radical adsorbed on the surface of the sample. The second moment, of the EPR signal below T(sub c) is fitted to the Brandt equation for a simple triangular lattice. The precision of this method compares quite favorably with those of the more standard methods such as micro sup(+)SR, Neutron scattering, and magnetic susceptibility
A study of molecular diffusion in polymer solutions by a microinterferometric method
A microinterferometric method was used to study the effect of solute concentration on the diffusion coefficient in polymer solutions and also to determine the effect of polymer concentration on the diffusion coefficient. The polyacrylonitrile-dimethylformamide system was used as a means of determining the accuracy of the experimental apparatus and procedure. The non-ionic, water soluble polymer, hydroxyethyl cellulose (commercially known as Natrosol), was used to study this effect with urea and D-glucose as the solutes.
The results obtained for the polyacrylonitrile-dimethylformamide system were in close agreement with the results obtained by Secor, which meant that the experimental technique is accurate enough to give reproducible data. The differential diffusion coefficient increased with the increase in solute concentration in all cases. The effect of solute concentration on the differential diffusion coefficient was found to be similar for various polymer concentrations and different solutes. The integral diffusion coefficient remained almost constant for the concentration range of the solutes used in this work. No effect of polymer concentration on the integral diffusion coefficient could be deduced from the experimental data --Abstract, page ii
Automated data acquisition and reduction system for torsional braid analyzer
Automated Data Acquisition and Reduction System (ADAR) evaluates damping coefficient and relative rigidity by storing four successive peaks of waveform and time period between two successive peaks. Damping coefficient and relative rigidity are then calculated and plotted against temperature or time in real time
Video Object Detection with an Aligned Spatial-Temporal Memory
We introduce Spatial-Temporal Memory Networks for video object detection. At
its core, a novel Spatial-Temporal Memory module (STMM) serves as the recurrent
computation unit to model long-term temporal appearance and motion dynamics.
The STMM's design enables full integration of pretrained backbone CNN weights,
which we find to be critical for accurate detection. Furthermore, in order to
tackle object motion in videos, we propose a novel MatchTrans module to align
the spatial-temporal memory from frame to frame. Our method produces
state-of-the-art results on the benchmark ImageNet VID dataset, and our
ablative studies clearly demonstrate the contribution of our different design
choices. We release our code and models at
http://fanyix.cs.ucdavis.edu/project/stmn/project.html
Microwave (EPR) measurements of the penetration depth measurements of high-Tc superconductors
The use is discussed of electron paramagnetic resonance (EPR) as a quick and easily accessible method for measuring the London penetration depth, lambda for the high T sub c superconductors. The method uses the broadening of the EPR signal, due to the emergence of the magnetic flux lattice, of a free radical adsorbed on the surface of the sample. The second moment, of the EPR signal below T sub c is fitted to the Brandt equation for a simple triangular lattice. The precision of this method compares quite favorably with those of the more standard methods such as micro sup(+)SR, neutron scattering, and magnetic susceptibility
ANALYZING THE EXPERIENCE OF ONLINE USERS USING B2C WEBSITES
Volume 2 Issue 1 (January 2014
Threat of Technological Unemployment: Are Hiring Managers Discounted for Using Standardized Employee Selection Practices?
Two studies were conducted to examine the tenability of Meehl’s (1986) “threat of technological unemployment” explanation for why practitioners of employee selection resist using standardized decision-making practices. The results of Study 1 support the existence of this threat by demonstrating that practitioners received less credit for the outcomes of employment decisions when structured rather than unstructured interviews were used to evaluate candidates and analytical rather than holistic data combination was used to determine candidates’ overall evaluations. The results of Study 2 support the influence of this threat on employee selection by demonstrating that practitioners recognized the effects using the standardized practices have on stakeholders’ perceptions of their causality/control over the hiring process, and that practitioners’ beliefs about stakeholders’ perceptions of their causality/control over the hiring process significantly influenced their intentions to use the employee selection practices via concerns about the perceived value of their employment (i.e., fear of technological unemployment)
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