1,769 research outputs found
Thirty-five years of computerized cognitive assessment of aging â Where are we now?
Over the past 35 years, the proliferation of technology and the advent of the internet have resulted in many reliable and easy to administer batteries for assessing cognitive function. These approaches have great potential for affecting how the health care system monitors and screens for cognitive changes in the aging population. Here, we review these new technologies with a specific emphasis on what they offer over and above traditional âpaper-and-pencilâ approaches to assessing cognitive function. Key advantages include fully automated administration and scoring, the interpretation of individual scores within the context of thousands of normative data points, the inclusion of âmeaningful changeâ and âvalidityâ indices based on these large norms, more efficient testing, increased sensitivity, and the possibility of characterising cognition in samples drawn from the general population that may contain hundreds of thousands of test scores. The relationship between these new computerized platforms and existing (and commonly used) paper-and-pencil tests is explored, with a particular emphasis on why computerized tests are particularly advantageous for assessing the cognitive changes associated with aging
A digital computer simulation and study of a direct-energy-transfer power-conditioning system
A digital computer simulation technique, which can be used to study such composite power-conditioning systems, was applied to a spacecraft direct-energy-transfer power-processing system. The results obtained duplicate actual system performance with considerable accuracy. The validity of the approach and its usefulness in studying various aspects of system performance such as steady-state characteristics and transient responses to severely varying operating conditions are demonstrated experimentally
Engineering Optomechanically Induced Transparency by coupling a qubit to a spinning resonator
We theoretically study the spectral properties of a pump-probe driven hybrid
spinning optomechanical ring resonator optically coupled with a two-level
quantum emitter (QE or qubit). Recently we have shown [arXiv:1810.03709] that
in the absence of the emitter the coupled cavity version of this setup is not
only capable of nonreciprocal light propagation but can also exhibit slow &
fast light propagation. In this work, we investigate in what ways the presence
of a single QE coupled with the optical whispering gallery modes of the
spinning optomechanical resonator can alter the probe light nonreciprocity.
Under the weak-excitation assumption and mean-field approximation, we find that
the interplay between the rotational/spinning Sagnac-effect and the qubit
coupling can lead to the enhancement both in the optomechanically induced
transparency (OMIT) peak value and in the width of the transparency window due
to the opening of qubit-assisted back reflection channel. However, compared to
the no-qubit case, we notice that such an enhancement comes at the cost of
degrading the group delay in probe light transmission by a factor of 1/2 for
clockwise rotary directions. The target applications of these results can be in
the areas of quantum circuitry and in non-reciprocal quantum communication
protocols where QEs are a key component.Comment: 9 pages, 6 figure
Verbal Dialogue versus Written Dialogue
Modern technology has moved on and completely changed the way that people can use the telephone
or mobile to dialogue with information held on computers. Well developed âwritten speech analysisâ does not work
with âverbal speechâ. The main purpose of our article is, firstly, to highlights the problems and, secondly, to shows
the possible ways to solve these problems
Cross-sectional analysis of university technology commercialization initiatives
Master of ScienceDepartment of Agricultural EconomicsVincent R. Amanor-BoaduThe promulgation of the Bayh-Dole Act of 1980, a declining share of federal research expenditures to the university, and the enforcement of intellectual property rights have contributed to the evolution of university research missions. This thesis sought to understand how the intellectual property policies and commercialization initiatives at research universities affect their commercialization activities and intensity. The ability of universities to engage in commercialization activities is dependent on the willingness of the researchers to disclose their inventions. We used cross-sectional data from AUTM (Association of University Technology Managers) and other sources to evaluate the effect universities intellectual property policies and other factors on faculty willingness to disclose their inventions and discoveries. The research revealed that universities' commercialization efforts have been intensifying over the years and across the institution. Intellectual property policies were found to have insignificant effect on the number of disclosures. This supports earlier research that has shown many faculty members were ignorant about such policies. On the other hand, licensing revenue, which basically goes to fund future research, was a very significant factor in disclosures and hence commercialization initiatives at universities
Deep images of cluster radio halos
New radio data are presented for the clusters A401, A545, A754, A1914, A2219
and A2390, where the presence of diffuse radio emission was suggested from the
images of the NRAO VLA Sky Survey. Sensitive images of these clusters, obtained
with the Very Large Array (VLA)at 20 cm confirm the existence of the diffuse
sources and allow us to derive their fluxes and intrinsic parameters.The
correlation between the halo radio power and cluster X-ray luminosity is
derived for a large sample of halo clusters, and is briefly discussed.Comment: 9 pages, 13 figures, Astron. Astrophys. in pres
Particle Energies and Filling Fractions of Radio Bubbles in Cluster Cores
Using Chandra images of cluster cores with clear radio bubbles, we have
determined k, which is the ratio of the total particle energy to that of the
electrons radiating between 10 MHz and 10 GHz. Radiative and dynamical
constraints on the bubbles indicate that the ratio of the energy factor, k, to
the volume filling factor, f, lies within the range 1 < k/f < 1000. Assuming
pressure equilibrium between the radio-emitting plasma and the surrounding
X-ray gas, none of the lobes have equipartition between relativistic particles
and magnetic field. There is no evidence for any dependence of the upper limit
of the k/f ratio on any physical parameter of the cluster or the radio source.
The distribution of the upper limit on k/f appears to be bimodal, the value for
some clusters being ~3 and for the others ~300. We show that this is may due to
the composition of the jet which forms the bubbles, the variation in the volume
filling fraction or variation in the amount of re-acceleration occurring in the
bubble.Comment: 12 pages, 9 figures; accepted for publication in MNRA
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