8,057 research outputs found
Magnetic ordering of nitrogen-vacancy centers in diamond via resonator-mediated coupling
Nitrogen-vacancy centers in diamond, being a promising candidate for quantum
information processing, may also be an ideal platform for simulating many-body
physics. However, it is difficult to realize interactions between
nitrogen-vacancy centers strong enough to form a macroscopically ordered phase
under realistic temperatures. Here we propose a scheme to realize long-range
ferromagnetic Ising interactions between distant nitrogen-vacancy centers by
using a mechanical resonator as a medium. Since the critical temperature in the
long-range Ising model is proportional to the number of spins, a ferromagnetic
order can be formed at a temperature of tens of millikelvin for a sample with
nitrogen-vacancy centers. This method may provide a new platform for
studying many-body physics using qubit systems.Comment: 5 pages, 4 figure
Empirical extinction coefficients for the GALEX, SDSS, 2MASS and WISE passbands
Using the "standard pair" technique of paring stars of almost nil and high
extinction but otherwise of almost identical stellar parameters from the SDSS,
and combing the SDSS, GALEX, 2MASS and WISE photometry ranging from the far UV
to the mid-IR, we have measured dust reddening in the FUV-NUV, NUV-u, u-g, g-r,
r-i, i-z, z-J, J-H, H-Ks, Ks-W1 and W1-W2 colors for thousands of Galactic
stars. The measurements, together with the E(B-V) values given by Schlegel et
al. (1998), allow us to derive the observed, model-free reddening coefficients
for those colors. The results are compared with previous measurements and the
predictions of a variety of Galactic reddening laws. We find that 1) The dust
reddening map of Schlegel et al. (1998) over-estimates E(B-V) by about 14 per
cent, consistent with the recent work of Schlafly et al. (2010) and Schlafly &
Finkbeiner (2011); 2) All the new reddening coefficients, except those for
NUV-u and u-g, prefer the R(V) = 3.1 Fitzpatrick reddening law rather than the
R(V) = 3.1 CCM and O'Donnell (O'Donnell 1994) reddening laws. Using the Ks-band
extinction coefficient predicted by the R(V) = 3.1 Fitzpatrick law and the
observed reddening coefficients, we have deduced new extinction coefficients
for the FUV, NUV, u, g, r, i, z, J, H, W1 and W2 passbands. We recommend that
the new reddening and extinction coefficients should be used in the future and
an update of the Fitzpatrick reddening law in the UV is probably necessary. We
stress however that the FUV- and NUV-band coefficients should be used with
caution given their relatively large measurement uncertainties. Finally,
potential applications of the "standard pair" technique with the LAMOST
Galactic surveys are discussed.Comment: 13 pages, 9 figures, accepted to MNRA
Outlook of Cognitive Neuroscience
Social science researches at present emphasize the construction of relations between multiple constructs. Psychological science is no exception. Before verifying whether their hypotheses are true with a questionnaire method or experimental method, scholars will check out the hot topics of recent years and construct multiple mediating and moderating relations first. They work on scattered topics that more or less overlap with many other disciplines. In previous years, the author focused on studying the youths with poor mental health in the new era of China, observing their moral choices in the corporate environment through game theory experiments. The conclusions are usually surprising- most new-generation youths choose to maximize their self-interests from between pro-social behaviors and risk aversion
Solving multiple-criteria R&D project selection problems with a data-driven evidential reasoning rule
In this paper, a likelihood based evidence acquisition approach is proposed
to acquire evidence from experts'assessments as recorded in historical
datasets. Then a data-driven evidential reasoning rule based model is
introduced to R&D project selection process by combining multiple pieces of
evidence with different weights and reliabilities. As a result, the total
belief degrees and the overall performance can be generated for ranking and
selecting projects. Finally, a case study on the R&D project selection for the
National Science Foundation of China is conducted to show the effectiveness of
the proposed model. The data-driven evidential reasoning rule based model for
project evaluation and selection (1) utilizes experimental data to represent
experts' assessments by using belief distributions over the set of final
funding outcomes, and through this historic statistics it helps experts and
applicants to understand the funding probability to a given assessment grade,
(2) implies the mapping relationships between the evaluation grades and the
final funding outcomes by using historical data, and (3) provides a way to make
fair decisions by taking experts' reliabilities into account. In the
data-driven evidential reasoning rule based model, experts play different roles
in accordance with their reliabilities which are determined by their previous
review track records, and the selection process is made interpretable and
fairer. The newly proposed model reduces the time-consuming panel review work
for both managers and experts, and significantly improves the efficiency and
quality of project selection process. Although the model is demonstrated for
project selection in the NSFC, it can be generalized to other funding agencies
or industries.Comment: 20 pages, forthcoming in International Journal of Project Management
(2019
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