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排序方式: 共有46条查询结果,搜索用时 390 毫秒
1.
Yoshishige Kemmoku Keiko Ishikawa Shigeyasu Nakagawa Teru Kawamoto Tateki Sakakibara 《Electrical Engineering in Japan》2002,138(2):14-23
A photovoltaic/wind/diesel generating system with a battery (PWD system) is discussed from the viewpoint of total CO2 gas emissions during system lifetime. The total emissions are the sum of the emissions occurring at manufacturing and operating. First, the manufacturing CO2 emissions of the photovoltaic generator and the wind turbine generator are calculated by “the process analysis method.” This method considers the material used in each generator, its weight and its CO2 emission rate. On the other hand, the manufacturing CO2 emissions of the diesel generator and the battery are calculated using “the interindustry (input‐output) table.” Second, the PWD system is operated on a computer so that the fuel consumption of the diesel generator is a minimum assuming that hourly series data of electric load, insolation intensity, wind speed, and air temperature are known during the year. And CO2 emissions occurring at system operation are obtained from the annual fuel consumption of the diesel generator. The results show that CO2 total emissions of the PWD system are lower than those of the conventional diesel generator system. The CO2 total emissions reach a minimum when the photovoltaic/wind generating ratio is 50/50. The CO2 emissions of manufacturing decrease with increasing of the wind generating ratio from 100/0 to 0/100. The CO2 total emissions decrease as the natural energy ratio increases. It is, however, saturated to about 60% when the ratio is more than 60%. And the CO2 total emissions increase with increasing of the battery capacity. It is concluded that the PWD system plays an important role in decreasing considerably the CO2 total emissions while the total system cost is high under the present price circumstances. © 2001 Scripta Technica, Electr Eng Jpn, 138(2): 14–23, 2002 相似文献
2.
A new method based on the Coanda effect for self oscillation of a circular jet bounded by rectangular enclosure is suggested. The experiments in both air and water reveal regions of stable oscillation wherein relationships are obtained between the Strouhal number and the shape factor of the channel. This oscillation method can also be used to mix different liquids in a vessel. For such applications, an improvement of mixing by oscillation is shown by means of a residual concentration diagram for a salt solution. 相似文献
3.
A Kubota K Yamauchi M Imano T Yonekura M Hoki K Nose S Hirooka M Kato H Oyanagi M Nakayama 《Canadian Metallurgical Quarterly》1998,14(1-2):138-139
The authors describe an extremely rare presentation of congenital infantile myofibromatosis. A full-term newborn boy presented with a thumb-sized subcutaneous mass on the mid-spinal line between the 2nd and 3rd lumbar spinous processes. A solid tumor arising from the interspinous ligament was resected. Microscopic and immunohistochemical studies revealed myofibromatosis. 相似文献
4.
Torn Shimizu Shigeyasu Ohkubo Mitsuo Kimura Isao Tabata Teruo Hori 《Coloration Technology》1987,103(3):132-137
The vapour pressures and heats of sublimation of 23 model disperse dyes have been measured by the vapour saturation method (modified transpiration method). The data obtained were in good agreement with those produced by the other investigators using the effusion method. The heats of sublimation are discussed in terms of molecular structure. 相似文献
5.
Katsuhiko Saido Shigeyasu Motohashi Takeshi Kuroki Tadashi Ikemura Makoto Kirisawa 《应用聚合物科学杂志》1984,29(11):3261-3268
Bis(2,4-diphenylbutyl) phathalate, a plasticizer for poly(vinyl chloride) (PVC), was synthesized from 2,4-diphenyl-1-butene obtained by a thermal decomposition under reduced pressure of waster polystyrene. The heat stability of bis(2,4-diphenylbutyl) phthalate was determined by thermogravimetric analysis and compared with typical plasticizers. It was recognized that bis(2,4-diphenylbutyl) phthalate showed high heat resistant. A test sheet of plasticized PVC with bis(2,4-diphenylbutyl) phthalate and bis(2-ethylhexyl) phthalate was prepared. The test sheet was used for determination of the plasticizing performance of bis(2,4-diphenylbutyl) phthalate. Although the effect of bis(2,4-diphenylbutyl) phthalate imparting flexibility to PVC is poorer than that of bis(2-ethylehexyl) phthalate, the former phthalate is well compatible with PVC and exceedingly heat-resistant. 相似文献
6.
Tanaka S Aoyama K Ichihashi M Arai S Honda Y Sawaki N 《Journal of electron microscopy》2007,56(4):141-144
An electron-beam-induced-current technique has been applied to scanning transmission electron microscopy to characterize GaN/AlGaN/n-Si heterostructures. The structure was formed by metalorganic vapor phase epitaxy using AlGaN as an intermediate layer. Two samples with nominal intermediate layer thicknesses of 60 and 120 nm were studied. It was found that there is a junction in the n-type Si region underneath the nitride/Si interface irrespective of the intermediate layer thickness, whereas induced current occurred neither in the nitride region nor at the nitride/Si interface. The junction formed was found to be undulated. The sample with the thin intermediate layer had undulations of a shorter periodicity than that with the thick intermediate layer. The formation of the junction is attributed to the diffusion of Al during the nitride growth. 相似文献
7.
Recent computing technology is providing alternative strategies for the functionality and implementation of controllers for
practical complex systems. An important issue will be how to integrate all information about control problems. In this paper,
we present the control-theoretic view of intelligent control technology, and discuss a paradigm for an information-integrated
control system.
This work was presented, in part, at the Third International Symposium on Artificial Life and Robotics, Oita, Japan, January
19–21, 1998 相似文献
8.
Yotaro Akamine Shigeyasu Matsuoka Masakuni Chiba Kunihiko Hidaka 《Electrical Engineering in Japan》2000,132(4):28-33
The breakdown voltages of the longer‐gap configurations in gaseous nitrogen and air that are necessary in designing superconducting electrical power apparatuses are measured at temperatures of 293 and 93 K. The quasi‐uniform electric field made by a sphere‐to‐sphere electrode with a diameter of 150 mm and a gap length of about 10 to 100 mm is used in the measurement of the breakdown voltages. When 50‐Hz ac and dc voltages are applied to the sphere‐to‐sphere gap, the breakdown voltages in nitrogen and air obey Paschen's law even at cryogenic temperatures (93 K). When a 1.4/50‐μs lightning impulse voltage is applied to the gap, the 50% breakdown voltage of nitrogen also obeys Paschen's law under UV irradiation of the cathode electrode. However, the breakdown voltage in air at 93 K is higher in the case of lightning impulse voltage applications, and the delay from impulse voltage application to breakdown occurrence is apparently longer at 93 K than at 293 K. © 2000 Scripta Technica, Electr Eng Jpn, 132(4): 28–33, 2000 相似文献
9.
Shinichirou Orita Yoshishige Kemmoku Tateki Sakakibara Shigeyasu Nakagawa 《Electrical Engineering in Japan》1998,125(4):26-33
A single-stage neural network has been proposed to forecast next day insolation. In this paper, a multi-stage neural network is developed to reduce forecasting error further. A first-stage neural network forecasts average atmospheric pressure for the next day from atmospheric pressure data of the previous day. A second-stage neural network forecasts insolation level for the next day from the average atmospheric pressure and weather data of the previous day. A third-stage neural network forecasts next day insolation from the insolation level and weather data of the previous day. Meteorological data of Omaezaki, Shizuoka at April 1994 were chosen as input data. The insolation values forecasted by the multi-stage and the single-stage neural networks are compared with the measurement values. The results show that the forecasting error is reduced to 24% (by the multi-stage) from 33% (by the single-stage). © 1998 Scripta Technica, Electr Eng Jpn, 125(4): 26–33, 1998 相似文献
10.
Shigeyasu Uno Junichi Hattori Kazuo Nakazato Nobuya Mori 《Journal of Computational Electronics》2011,10(1-2):104-120
The acoustic phonon modulation (confinement) in semiconductor nanostructures and their interaction with electrons are reviewed. Special emphasis will be placed on free-standing and layered slabs, as well as nanowires. Analysis includes acoustic phonon dispersion relations, displacement wave functions, amplitudes, form factor, electron-phonon scattering rate, and electron mobility. 相似文献