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排序方式: 共有134条查询结果,搜索用时 15 毫秒
91.
Hideo Ohno Satoshi Konishi Takanori Nagasaki Toshimasa Kurasawa Hiroji Katsuta Hitoshi Watanabe Toru Matsuo 《Journal of Nuclear Materials》1985,132(3):222-230
The conductivity of a sintered pellet of Li8ZrO6 was measured in dry or wet argon atmosphere by the two-terminal technique with an AC Wheatstone bridge in the temperature range 350–1050 K. The temperature dependence of conductivity multiplied by temperature of Li8ZrO6 in a dry environment had two transition points at 426 and 833 K. The activation energies of conductivity in high, middle and low temperature regions were 103.2, 52.1 and 37.4 kJ/mol, respectively. The activation energies of conductivity agreed well with those obtained by temperature dependence of spin-lattice relaxation time of 7Li with pulsed nuclear magnetic resonance. 相似文献
92.
Kenichi Yoshioka Tsukasa Kikuchi Satoshi Gunji Hironori Kumanomido Ishi Mitsuhashi Takuya Umano 《Journal of Nuclear Science and Technology》2013,50(2):282-293
We have developed a void reactivity evaluation method by using modified conversion ratio measurements in a light water reactor (LWR) critical lattice. Assembly-wise void reactivity is evaluated from the “finite neutron multiplication factor”, k*, deduced from the modified conversion ratio of each fuel rod. The distributions of modified conversion ratio and k* on a reduced-moderation LWR lattice, for which the improvement of negative void reactivity is a serious issue, were measured. Measured values were analyzed with a continuous-energy Monte Carlo method. The measurements and analyses agreed within the measurement uncertainty.The developed method is useful for validating the nuclear design methodology concerning void reactivity. 相似文献
93.
S Itoh C Tanaka Y Nakamura K Yoshida N Mitsuhashi H Takeuchi Y Kuwabara 《Canadian Metallurgical Quarterly》1996,11(5):361-365
Although primary cardiac tumors are extremely rare, their prenatal and neonatal management is very important because fetal arrhythmia is a frequent complication and such tumors may be the only manifestation of tuberous sclerosis. We present 2 cases of fetal cardiac tumor in which cardiac function was assessed by color Doppler ultrasonography. In both cases, there was no evidence of tuberous sclerosis or cardiac failure and tumor regression was noted 8 months after birth. Ultrasonographic examination of fetal cardiac function was useful in the management of these tumors. 相似文献
94.
Kawanaka J. Kubodera S. Sasaki W. Kurosawa K. Mitsuhashi K. Igarashi T. 《IEEE journal of selected topics in quantum electronics》1995,1(3):852-858
New xenon excimer lamps in vacuum ultraviolet (VUV) have been developed in quasi-CW jet discharges. Quantitative characteristics of xenon clusters produced with two different kinds of nozzles were studied to verify the xenon excimer formation mechanisms in jet discharges. Experimental results strongly indicate the xenon excimer emission at 174 mn as a result of the direct excitation of the xenon clusters. Output powers and pulse widths of the lamps were thus controlled by changing cluster formation parameters. The maximum output power of 1.5 W with an efficiency of 3.0% was obtained at 174 nm when the conical nozzle was used. The VUV emission lasted 5 ms (FWHM) 相似文献
95.
DCT/IDCT processor for HDTV developed with dsp silicon compiler 总被引:1,自引:0,他引:1
Takashi Miyazaki Takao Nishitani Masato Edahiro Ikuko Ono Kaoru Mitsuhashi 《The Journal of VLSI Signal Processing》1993,5(2-3):151-158
This article presents a discrete cosine transform (DCT) processor for high definition television (HDTV) by using an extended version of DSP Silicon Compiler. The extension is mainly concerned with module generation functions. A matrix-vector product module composed of multiply-accumulators (MACs) is newly added to the silicon compiler. The compiler accomplishes placement of leaf-cells and routing between the cells, referring to a prototype layout for the MAC. The prototype, which consists of a Booth multiplier and a carry look ahead adder, is carefully designed to attain high operation speed. The processor developed by the silicon compiler carries out 8×8 DCT and its inverse transform (IDCT). In order to evaluate the newly extended functions in the compiler, the architecture employed for the processor is based on the matrix-vector product method. By using DSP Silicon Compiler and 0.8 µm triple metal CMOS technology, the DCT processor is easily implemented with error-free environment and achieves a 50MHz data rate, which meets Japanese HDTV base line signal processing. The chip is implemented on a 12.80×12.57mm
2 area. 相似文献
96.
A demodulation method for polarimetric optical fibre sensors is described and demonstrated. Two signals with a π/2 phase difference are generated from the sensor output signal and its first derivative with respect to the phase. This method does not require strict modulation conditions for the laser source 相似文献
97.
I. Sakai Y. Yamamoto T. Mitsuhashi D. Amano H. Iwasaki 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》2002,480(2-3):373-378
The lifetime of the stored electron beam in the compact storage ring AURORA is governed by the Touchek effect. It has been shown that it is appreciably increased by applying a vertical rf kick field to the electron beam without giving harmful effect to the beam stability. Interferometric measurement of the radiation beam profile showed an increase in the beam size, indicating the reduction of the Touchek effect. Application of the field with increase in power has induced collective excitation of the betatron oscillation. 相似文献
98.
99.
The simultaneous removal of calcium and chloride ions from calcium chloride solution using magnesium-aluminum oxide 总被引:2,自引:0,他引:2
We investigated the removal of Ca(2+) and Cl(-) from CaCl(2) solution at 20-60 degrees C, using magnesium-aluminum oxide, Mg(0.80)Al(0.20)O(1.10), prepared by the thermal decomposition of a hydrotalcite-like compound, Mg(0.80)Al(0.20)(OH)(2)(CO(3))(0.10).0.78 H(2)O. The degree of Ca(2+) and Cl(-) removal from the solution increased with increasing initial CaCl(2) concentration, temperature, and quantity of Mg(0.80)Al(0.20)O(1.10) added. When Mg(0.80)Al(0.20)O(1.10) was added to 0.25 M CaCl(2) solution in a Mg(0.80)Al(0.20)O(1.10)/CaCl(2) molar ratio of 20, the degree of Ca(2+) and Cl(-) removal from the solution at 60 degrees C after 0.5 h was 93.0% and 98.2%, respectively. These results reveal that Mg(0.80)Al(0.20)O(1.10) has the capacity to remove Ca(2+) and Cl(-) simultaneously from aqueous solution. 相似文献
100.