9,480 research outputs found
Out of plane effect on the superconductivity of Sr2-xBaxCuO3+y with Tc up to 98K
A series of new Sr2-xBaxCuO3+y (0 x 0.6) superconductors were prepared using
high-pressure and high-temperature synthesis. A Rietveld refinement based on
powder x-ray diffraction confirms that the superconductors crystallize in the
K2NiF4-type structure of a space group I4/mmm similar to that of La2CuO4 but
with partially occupied apical oxygen sites. It is found that the
superconducting transition temperature Tc of this Ba substituted Sr2CuO3+y
superconductor with constant carrier doping level, i.e., constant d, is
controlled not only by order/disorder of apical-O atoms but also by Ba content.
Tcmax =98 K is achieved in the material with x=0.6 that reaches the record
value of Tc among the single-layer copper oxide superconductors, and is higher
than Tc=95K of Sr2CuO3+y with optimally ordered apical-O atoms. There is
Sr-site disorder in Sr2-xBaxCuO3+y which might lead to a reduction of Tc. The
result indicates that another effect surpasses the disorder effect that is
related either to the increased in-plane Cu-O bond length or to elongated
apical-O distance due to Ba substitution with larger cation size. The present
experiment demonstrates that the optimization of local geometry out of the Cu-O
plane can dramatically enhance Tc in the cuprate superconductors.Comment: 23 Pages, 1 Table, 5 Figure
Accurate Estimation of Discharge Hydrograph in a Compound Meandering Channel Using a Two-Dimensional Numerical Model
Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv
Quantitative Tactile Examination Using Shape Memory Alloy Actuators for the Early Detection of Diabetic Neuropathy
Diabetic neuropathy (DPN) is asymptomatic in its early phases but can cause serious complications as it progresses. Most DPN tests are cumbersome and produce only qualitative assessments, and simpler approaches that yield quantitative results are needed. Techniques that allow patients to perform examinations themselves would be especially valuable. In this study, we focused on quantifying the decline in tactile sensation associated with DPN and developed a measurement device that used a thin shape memory alloy (SMA) wire as the actuator. An ON/OFF pulse current caused the wire to shrink and expand. This vibration was amplified by a round-headed pin, allowing even DPN patients with reduced tactile sensitivity to detect the stimuli generated when lightly touching the pin with their fingertips. The tactile stimuli were ranked into 30 levels of intensity. A key advantage of the device is that it can be used by patients themselves, returning quantified results within minutes. Although developed for DPN, the method can be applied to the detection of peripheral neuropathy in general
2-D Simulation of Velocity Distribution in a Doubly Meandering Compound Channel Using CIP-Based Scheme
Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv
Bandwidth-disorder phase diagram of half doped layered manganites
Phase diagrams in the plane of (the average ionic radius, related to
one-electron bandwidth ) and (the ionic radius variance,
measuring the quenched disorder), or ``bandwidth-disorder phase diagrams'',
have been established for perovskite manganites, with three-dimensional (3)
Mn-O network. Here we establish the intrinsic bandwidth-disorder phase diagram
of half-doped layered manganites with the two-dimensional (2) Mn-O network,
examining in detail the ``mother state'' of the colossal magnetoresistance
(CMR) phenomenon in crystals without ferromagnetic instability. The
consequences of the reduced dimensionality, from 3 to 2, on the
order-disorder phenomena in the charge-orbital sectors are also highlighted.Comment: REVTeX 4 style; 5 pages, 4 figure
Bogoliubov angle and visualization of particle-hole mixture in superconductors
Superconducting excitations --Bogoliubov quasiparticles -- are the quantum
mechanical mixture of negatively charged electron (-e) and positively charged
hole (+e). Depending on the applied voltage bias in STM one can sample the
particle and hole content of such a superconducting excitation. Recent Scanning
Tunneling Microscope (STM) experiments offer a unique insight into the inner
workings of the superconducting state of superconductors. We propose a new
observable quantity for STM studies that is the manifestation of the
particle-hole dualism of the quasiparticles. We call it a {\em Bogoliubov
angle}. This angle measures the relative weight of particle and hole amplitude
in the superconducting (Bogoliubov) quasiparticle. We argue that this quantity
can be measured locally by comparing the ratio of tunneling currents at
positive and negative biases. This Bogoliubov angle allows one to measure
directly the energy and position dependent particle-hole admixture and
therefore visualize robustness of superconducting state locally. It may also
allow one to measure the particle-hole admixture of excitations in normal state
above critical temperature and thus may be used to measure superconducting
correlations in pseudogap state.Comment: 16 pages, latex file, 9 eps figure
Sex and age-level differences of walking time in preschool children on an obstacle frame
<p>Abstract</p> <p>Background</p> <p>Stepping over an obstacle is a kind of compound movement that makes walking more difficult, especially for preschool children. This study examines sex and age-level differences in walking time in preschool children on an obstacle frame.</p> <p>Methods</p> <p>The participants included 324 healthy preschool children: four-year-old boys (51) and girls (51), five-year-old boys (50) and girls (60), and six-year-old boys (62) and girls (50). A 5 cm- or 10 cm-high obstacle (depth 11.5 cm, width 23.5 cm) was set at the halfway point of a 200 cm × 10 cm walking course.</p> <p>Results</p> <p>The participants walked to the end of the course and back as fast as possible under three conditions: no obstacle, low obstacle and high obstacle. Walking time showed age-level differences in all conditions, but there were no differences in sex. Age levels were divided into two groups, with one group within the first six months of their birthday, and the second group within the last six months of that year. Walking time for children in the first half of their fourth year was longer than that of the five- and six-year-old children. In addition, for children in the last half of their fourth year, walking time was longer than both sexes in the last half of their fifth and sixth years. The children in the latter half of their fifth year had a longer walking time in the high obstacle condition than those in the last half of their sixth year. In the four-year-old participants, walking time was shorter with no obstacles than with a high obstacle frame.</p> <p>Conclusions</p> <p>In the above data, obstacle course walking time does not show a gender difference, except that the four-year-old participants needed longer than the five- and six-year-old children. Setting the obstacle 10 cm high also produced a different walking time in the five- and six-year-old participants. The high obstacle step test (10 cm) best evaluated the dynamic balance of preschool children.</p
片脚立位時の重心動揺量および下肢筋活動量
13301甲第4265号博士(学術)金沢大学博士論文要旨Abstrac
片脚立位時の重心動揺量および下肢筋活動量
13301甲第4265号博士(学術)金沢大学博士論文本文Ful
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