1,264 research outputs found
A Minkowski Distance-based Generalisation Method for Improving Centre Loss for Deep Face Recognition
Period halving of Persistent Currents in Mesoscopic Mobius ladders
We investigate the period halving of persistent currents(PCs) of
non-interacting electrons in isolated mesoscopic M\"{o}bius ladders without
disorder, pierced by Aharonov-Bhom flux. The mechanisms of the period halving
effect depend on the parity of the number of electrons as well as on the
interchain hopping. Although the data of PCs in mesoscopic systems are
sample-specific, some simple rules are found in the canonical ensemble average,
such as all the odd harmonics of the PCs disappear, and the signals of even
harmonics are non-negative. {PACS number(s): 73.23.Ra, 73.23.-b, 68.65.-k}Comment: 6 Pages with 3 EPS figure
Diagnosis and monitoring of Alzheimer's patients using classical and deep learning techniques
Machine based analysis and prediction systems are widely used for diagnosis of Alzheimer's Disease (AD). However, lower accuracy of existing techniques and lack of post diagnosis monitoring systems limit the scope of such studies. In this paper, a novel machine learning based diagnosis and monitoring of AD-like diseases is proposed. The AD-like diseases diagnosis process is accomplished by analysing the magnetic resonance imaging (MRI) scans using deep learning and is followed by an activity monitoring framework to monitor the subjects’ activities of daily living using body worn inertial sensors. The activity monitoring provides an assistive framework in daily life activities and evaluates vulnerability of the patients based on the activity level. The AD diagnosis results show up to 82% improvement in comparison to well-known existing techniques. Moreover, above 95% accuracy is achieved to classify the activities of daily living which is quite encouraging in terms of monitoring the activity profile of the subject
Scalar-Torsion Mode in a Cosmological Model of the Poincar\'{e} Gauge Theory of Gravity
We investigate the equation of state (EoS) of the scalar-torsion mode in
Poincar\'{e} gauge theory of gravity. We concentrate on two cases with the
constant curvature solution and positive kinetic energy, respectively. In the
former, we find that the torsion EoS has different values in the various stages
of the universe. In particular, it behaves like the radiation (matter) EoS of
() in the radiation (matter) dominant epoch, while in the late
time the torsion density is supportive for the accelerating universe. In the
latter, our numerical analysis shows that in general the EoS has an asymptotic
behavior in the high redshift regime, while it could cross the phantom divide
line in the low redshift regime.Comment: 12 pages, 2 figures, title changed, revised version accepted for
publication in JCA
Brownian Thermal Noise in Multilayer Coated Mirrors
We analyze the Brownian thermal noise of a multi-layer dielectric coating,
used in high-precision optical measurements including interferometric
gravitational-wave detectors. We assume the coating material to be isotropic,
and therefore study thermal noises arising from shear and bulk losses of the
coating materials. We show that coating noise arises not only from layer
thickness fluctuations, but also from fluctuations of the interface between the
coating and substrate, driven by internal fluctuating stresses of the coating.
In addition, the non-zero photoeleastic coefficients of the thin films modifies
the influence of the thermal noise on the laser field. The thickness
fluctuations of different layers are statistically independent, however, there
exists a finite coherence between layers and the substrate-coating interface.
Taking into account uncertainties in material parameters, we show that
significant uncertainties still exist in estimating coating Brownian noise.Comment: 26 pages, 18 figure
Quantifying Properties of the QCD Matter at RHIC
We will review recent results on quantitative description of global
properties of bulk partonic matter at RHIC. These results include strangeness
phase space factor of the partonic matter, azimuthal angular anisotropy ,
and transverse momentum distributions of effective partons at the
hadronization of bulk partonic matter. We present empirical constraints on
parton energy loss in the high region ( 5 GeV/c). A flat as a
function of at mid-rapidity implies a constant fraction of the parton
energy loss () and the fraction reaches 25% for neutral ,
charged hadrons and non-photonic electrons of heavy quark decays from central
Au+Au collisions at 200 GeV. Collision centrality dependence of
from Au+Au and Cu+Cu collisions indicates that the fraction is
approximately proportional to particle rapidity density divided by the
initial transverse overlapping area of the colliding nuclei. Implications on
dynamics of parton energy loss will be discussed.Comment: To Appear in SQM2008 Conference Proceeding
Fluorophore-Doped Core-Multishell Spherical Plasmonic Nanocavities: Resonant Energy Transfer towards a Loss Compensation
Cataloged from PDF version of article.Plasmonics exhibits the potential to break the diffraction limit and bridge the gap between electronics and
photonics by routing and manipulating light at the nanoscale. However, the inherent and strong energy
dissipation present in metals, especially in the near-infrared and visible wavelength ranges, significantly
hampersthe applications in nanophotonics. Therefore, it is amajor challengetomitigatethe losses. One way
to compensate the losses is to incorporate gain media into plasmonics. Here, we experimentally show that
the incorporation of gain material into a local surface plasmonic system (Au/silica/silica dye core multishell
nanoparticles) leads to a resonant energy transfer from the gain media to the plasmon. The optimized
conditions for the largest loss compensation are reported. Both the coupling distance and the spectral
overlap arethe key factorsto determinetheresulting energy transfer. Theinterplay of these factors leadsto
a non-monotonous photoluminescence dependence as a function of the silica spacer shell thickness.
Nonradiativetransferrate is increased by morethan 3 orders of magnitude attheresonant condition, which
is key evidence of the strongest coupling occurring between the plasmon and the gain material
Enhanced refrigerant capacity in Gd-Al-Co microwires with a biphase nanocrystalline/amorphous structure
"A class of biphase nanocrystalline/amorphous Gd(50+5x)Al(30-5x)Co20 (x = 0, 1, 2) microwires fabricated directly by melt-extraction is reported. High resolution transmission electron microscopy and Fourier function transform based analysis indicate the presence of a volume fraction (similar to 20%) of similar to 10nm sized nanocrystallities uniformly embedded in an amorphous matrix. The microwires possess excellent magnetocaloric properties, with large values of the isothermal entropy change (-Delta S-M similar to 9.7 J kg(-1) K-1), the adiabatic temperature change (Delta T-ad similar to 5.2K), and the refrigerant capacity (RC similar to 654 J kg(-1)) for a field change of 5 T. The addition of Gd significantly alters T-C while preserving large values of the Delta S-M and RC. The nanocrystallites allow for enhanced RC as well as a broader operating temperature span of a magnetic bed for energy-efficient magnetic refrigeration.
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