6,151 research outputs found
Magnetization process in a chiral p-wave superconductor with multi-domains
A simulation study for the magnetization process is performed for the
multi-domain state in a chiral p-wave superconductor, using the time-dependent
Ginzburg-Landau theory. The external field penetrates inside as core-less
vortices through the domain wall, forming the vortex sheet structure. We find
that, with increasing magnetic fields, the domain walls move so that the
unstable domains shrink to vanish. Therefore, the single domain structure is
realized at higher fields
Flux flow and pinning of the vortex sheet structure in a two-component superconductor
A simulation study using the time-dependent Ginzburg-Landau theory is
performed for the vortex state in two-component superconductors, such as
PrOs_4_Sb_12_. We investigate the flux flow and the pinning of the vortex sheet
structure. We find domain wall that traps half flux-quantum vortices and moves
with the flux flow. In the pinning case, we observe an emitting process of a
conventional vortex from the vortex sheet by combining a pair of half
flux-quantum vortices.Comment: 4 pages, 4 figures, to appear in Phys. Rev.
Photoionization yield and absorption coeffi- cient of xenon in the region 860-1022 deg angstrom
Photoionization yield and absorption coefficient of xenon gas measured by photoelectric method
Some Intensity Measurements in the Vacuum Ultraviolet
Intensity measurements in vacuum ultraviolet - photoelectric yields of untreated metals and semiconductors measured by calibrated thermocoupl
Focusing and sorting of ellipsoidal magnetic particles in microchannels
We present a simple method to control the position of ellipsoidal magnetic
particles in microchannel Poiseuille flow using a static uniform magnetic
field. The magnetic field is utilized to pin the particle orientation, and the
hydrodynamic interactions between ellipsoids and channel walls allow control of
the transverse position of the particles. We employ a far-field hydrodynamic
theory and simulations using the boundary element method and Brownian dynamics
to show how magnetic particles can be focussed and segregated by size and
shape. This is of importance for particle manipulation in lab-on-a-chip
devices
Far-field theory for trajectories of magnetic ellipsoids in rectangular and circular channels
We report a method to control the positions of ellipsoidal magnets in flowing
channels of rectangular or circular cross section at low Reynolds number.A
static uniform magnetic field is used to pin the particle orientation, and the
particles move with translational drift velocities resulting from hydrodynamic
interactions with the channel walls which can be described using Blake's image
tensor.Building on his insights, we are able to present a far-field theory
predicting the particle motion in rectangular channels, and validate the
accuracy of the theory by comparing to numerical solutions using the boundary
element method.We find that, by changing the direction of the applied magnetic
field, the motion can be controlled so that particles move either to a curved
focusing region or to the channel walls.We also use simulations to show that
the particles are focused to a single line in a circular channel.Our results
suggest ways to focus and segregate magnetic particles in lab-on-a-chip
devices
Classical Cepheids, what else?
We present new and independent estimates of the distances to the Magellanic
Clouds (MCs) using near-infrared (NIR) and optical--NIR period--Wesenheit (PW)
relations. The slopes of the PW relations are, within the dispersion, linear
over the entire period range and independent of metal content. The absolute
zero points were fixed using Galactic Cepheids with distances based on the
infrared surface-brightness method. The true distance modulus we found for the
Large Magellanic Cloud--- mag---and the
Small Magellanic Cloud--- mag---agree quite
well with similar distance determinations based on robust distance indicators.
We also briefly discuss the evolutionary and pulsation properties of MC
Cepheids
Serum vitamin D in patients with mild cognitive impairment and Alzheimer's disease
Objectives: To determine the relevance of Mini-Mental State Examination (MMSE), serum 25-hydroxyvitamin D (25(OH)D3), and 1,25(OH)2D3 concentrations to mild cognitive impairment (MCI) and various stages of Alzheimer's disease (AD). Materials and Methods: The study included 230 participants (>74 years) allocated to three main groups: 1-healthy subjects (HS, n = 61), 2-patients with MCI (n = 61), and 3- patients with Alzheimer's disease (AD) subdivided into three stages: mild (n = 41), moderate (n = 35), and severe AD (n = 32). The cognitive status was evaluated using MMSE. Serum 25 (OH)D3 (ng/ml) and 1,25(OH)2D3 concentrations (pg/ml) were determined by competitive radioimmunoassay. Results: MMSE scores and 25(OH)D3 were decreased in MCI and all stages of the AD in both genders. MMSE variability was due to gender in HS (11%) and to 25(OH)D3 in MCI (15%) and AD (26%). ROC analysis revealed an outstanding property of MMSE in diagnosis of MCI (AUC, 0.906; CI 95%, 0.847–0.965; sensitivity 82%; specificity, 98%) and AD (AUC, 0.997; CI 95%, 0.992–1; sensitivity, 100%; specificity, 98%). 25(OH)D3 exhibited good property in MCI (AUC, 0.765; CI 95%, 0.681–0.849; sensitivity, 90%; specificity, 54%) and an excellent property in diagnosis of AD (AUC, 0.843; CI 95%, 0.782–0.904; sensitivity, 97%; specificity, 79%). Logistic analyses revealed that, in MCI, MMSE could predict (or classify correctly) with 97.6% accuracy (Wald, 15.22, β, −0.162; SE, 0.554; OR = 0.115:0.039–0.341; p =.0001), whereas 25(OH)D3 with 80% accuracy (Wald, 41,013; β, −0.213; SE, 0.033; OR = 0.808: 0.757–863; p =.0001). 25(OH)D3 was the only significant predictor for the severe AD and contributed to MMSE variability. Age and gender were significant predictors only in the moderate AD. In patients with MCI, 25(OH)D3 and 1,25(OH)2D3 were correlated men, but in case of the AD, they were correlated in women. Conclusions: MMSE and serum 25(OH)D3 concentrations could be useful biomarkers for prediction and diagnosis of MCI and various stages of the AD. The results support the utility of vitamin D supplementation in AD therapy regimen. © 2018 The Authors. Brain and Behavior published by Wiley Periodicals, Inc
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