590 research outputs found
Energy Spectra and Normalized Power Spectral Densities of X-Ray Nova GS 2000+25
The X-ray energy spectra and Normalized Power Spectral Densities (NPSDs) of
an X-ray nova, GS 2000+25, were investigated. The X-ray energy spectra of the
source consist of two components: a hard component, which can be represented by
a power-law, and an ultra-soft component, represented by radiation from an
optically-thick accretion disk (the disk component). In a model in which the
power-law component is the Compton-scattered radiation, it is found that the
temperature of the incident blackbody radiation to the Compton cloud decrease
from 0.8 keV to 0.2 keV according to the decay of the intensity, which
coincides with that of the inner accretion disk. When the source changed from
the high-state to the low-state, both the photon index of the power-law
component (or Compton y-parameter) and the NPSD of the hard component
dramatically changed as did GS 1124-683. That is, the photon index changed from
2.2--2.6 to 1.7--1.8 and the absolute values of the NPSDs at 0.3 Hz of the hard
component in the low-state became about 10-times larger than those of the hard
component in the high-state. These X-ray properties were similar to those of
other black-hole candidates, such as Cyg X-1, GX 339-4, and LMC X-3.Comment: 24 pages, text only, Full version is published in PASJ 54, 609-627
(2002
Scalable Spin Amplification with a Gain over a Hundred
We propose a scalable and practical implementation of spin amplification
which does not require individual addressing nor a specially tailored spin
network. We have demonstrated a gain of 140 in a solid-state nuclear spin
system of which the spin polarization has been increased to 0.12 using dynamic
nuclear polarization with photoexcited triplet electron spins. Spin
amplification scalable to a higher gain opens the door to the single spin
measurement for a readout of quantum computers as well as practical
applications of nuclear magnetic resonance (NMR) spectroscopy to infinitesimal
samples which have been concealed by thermal noise.Comment: 6 pages, 7 figure
Peran Human Capital Terhadap Efisiensi Perusahaan Perbankan Di Indonesia
—Human capital (HC) menjadi salah satu faktor pen-ting dalam keunggulan kompetitif Perusahaan untuk memenang-kan persaingan, dimana aspek tersebut berperan dalam mening-katkan potensi Sumber Daya Manusia (SDM) agar dapat diber-dayakan secara optimal. HC berkaitan dengan investasi Perusa-haan dalam pengembangan SDM. Adanya kecenderungan Peru-sahaan dalam mengeluarkan biaya tenaga kerja cukup tinggi, khususnya pada Perusahaan perbankan, dapat mempengaruhi efisiensi Perusahaan. Oleh karena itu penelitian ini dilakukan untuk mengetahui bagaimana peran HC terhadap efisiensi Peru-sahaan perbankan di Indonesia dengan menghitung rasio biaya tenaga kerja yang juga menyangkut biaya pendidikan dan pela-tihan. Penelitian ini menggunakan metode kuantitatif dengan teknik analisis Data Envelopment Analysis (DEA). Sampel dari penelitian ini adalah 31 Bank yang terdaftar di Bursa Efek Indonesia. Berdasarkan hasil analisa ditemukan bahwa terdapat kontribusi human capital terhadap efisiensi bank di Indonesia
H2-decoupling-accelerated H1 spin diffusion in dynamic nuclear polarization with photoexcited triplet electrons
In dynamic nuclear polarization (DNP) experiments applied to organic solids for creating nonequilibrium, high H1 spin polarization, an efficient buildup of H1 polarization is attained by partially deuterating the material of interest with an appropriate H1 concentration. In such a dilute H1 spin system, it is shown that the H1 spin diffusion rate and thereby the buildup efficiency of H1 polarization can further be enhanced by continually applying radiofrequency irradiation for deuterium decoupling during the DNP process. As experimentally confirmed in this work, the electron spin polarization of the photoexcited triplet state is mainly transferred only to those H1 spins, which are in the vicinity of the electron spins, and H1 spin diffusion transports the localized H1 polarization over the whole sample volume. The H1 spin diffusion coefficients are estimated from DNP repetition interval dependence of the initial buildup rate of H1 polarization, and the result indicates that the spin diffusion coefficient is enhanced by a factor of 2 compared to that without H2 decoupling.This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in M. Negoro, K. Nakayama, K. Tateishi, A. Kagawa, K. Takeda, and M. Kitagawa, J. Chem. Phys. 133, 154504 (2010) and may be found at https://doi.org/10.1063/1.3493453
Severe myoclonic epilepsy in infancy: evolution of seizures
Changes in seizure type of severe myoclonic epilepsy (SME) in infancy were reviewed retrospectively in 14 patients (11 males and 3 females) who were followed-up to the age of 7 years or more. The observation period ranged from 5 to 16 years with a mean of 10 years. During the follow-up, three or four types of seizures were seen per patient, but the pattern of appearance and disappearance of each seizure type varied considerably among the patients. Tonic-clonic convulsion, either generalized or unilateral, was seen most consistently through the entire course, and it continued to the end of follow-up in 11 patients (79%). On the contrary, myoclonic seizure, complex partial seizure, and atypical absence often disappeared and reappeared repeatedly during the course. In SME, seizure symptoms varied widely among patients in comparison with other neurological symptoms, and the most consistent core seizure type was tonic-clonic convulsions
Patient-Specific Neurovascular Simulator for Evaluating the Performance of Medical Robots and Instrumens
Proceedings of the 2006 IEEE International Conference on Robotics and Automation, Orlando, Florida, May 200
The X-ray CCD camera of the MAXI Experiment on the ISS/JEM
MAXI, Monitor of All-sky X-ray Image, is the X-ray observatory on the
Japanese experimental module (JEM) Exposed Facility (EF) on the International
Space Station (ISS). MAXI is a slit scanning camera which consists of two kinds
of X-ray detectors: one is a one-dimensional position-sensitive proportional
counter with a total area of , the Gas Slit Camera (GSC), and
the other is an X-ray CCD array with a total area , the
Solid-state Slit Camera (SSC). The GSC subtends a field of view with an angular
dimension of 1 while the SSC subtends a field of view
with an angular dimension of 1 times a little less than 180. In
the course of one station orbit, MAXI can scan almost the entire sky with a
precision of 1 and with an X-ray energy range of 0.5-30 keV. We have
developed the engineering model of CCD chips and the analogue electronics for
the SSC. The energy resolution of EM CCD for Mn K has a full-width at
half maximum of 182 eV. Readout noise is 11 e^- rms.Comment: 10 pages, 4 figures Accepted for Nuclear Instruments and Method in
Physics Researc
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