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81.
A prototype Stirling cycle refrigerator employing helium as a working fluid was investigated to determine whether a freon‐free machine was a viable alternative for the current household refrigerator. A displacer‐type or β‐type Stirling cycle machine of 100‐W capacity was designed and tested using varying design parameters such as dead volume ratio, working fluids, the ratio of the compression volume to the expansion volume, and the phase difference between a power piston and displacer. The detrimental effect of the dead space on the refrigeration capacity was confirmed. The refrigeration produced by nitrogen in an expansion space was 28% less than that produced by helium. The optimum volume ratio and the phase difference for maximum refrigeration was determined under the design operation conditions. Moreover, the refrigeration correlation formula as a function of these parameters was obtained. © 2002 Wiley Periodicals, Inc. Heat Trans Asian Res, 31(5): 344–361, 2002; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.10033 相似文献
82.
83.
Aiba Shinya Ota Terukazu Tsuchida Hajime 《International Journal of Heat and Mass Transfer》1980,23(3):311-319
An experimental investigation of heat transfer around four cylinders closely spaced in a cross-flow of air has been conducted. The cylinders are settled in tandem with equal distances between centers. Their inline pitch ratio is in the range of (c = distance between cylinders' centers, d = cylinder diameter); the Reynolds number ranges from 104 to 5 × 104. It is found that there exists a critical Reynolds number Redc at which the heat transfer behavior changes drastically, and is correlated with the in-line pitch ratio by .Variations of characteristic features of the mean and local Nusselt numbers are discussed in relation to the length of the vortex formation region behind the cylinder. 相似文献
84.
The difficulties of operationalizing race in research and practice for social, behavioral, and genetic researchers and practitioners are neither new nor related to recent genetic knowledge. For geneticists, the bases for understanding groups are clines, observed traits that gradually change in frequency between geographic regions without distinct identifiable population boundaries and population histories that carry information about the distribution of genetic variants. For psychologists, race may not exist or be a social and cultural construct associated with fluid social inferences. Because definitions of populations and race can be socially and biologically incongruent, the authors suggest that geneticists and social and behavioral scientists and clinicians attend to external validity issues by operationalizing population and racial categories and avoiding race proxies for other biological, social, and cultural constructs in research designs, data analyses, and clinical practice. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
85.
86.
Seiji Usami Takashi Fujikawa Koyu Ota Toshinori Hayashi Jun'ichi Tsukajima 《Catalysis Letters》1993,20(1-2):159-168
A new apparatus to obtain information on local structures and chemical states of solid surfaces has been constructed, with which we measure electron energy-loss fine structures (EELFS), excited by electrons of a few keV incident at a grazing angle. We describe results about O/Ni(100) and O/W(100) systems, where we extensively take advantage of anisotropy in regard to momentum transfer of the probe electron and high surface sensitivity of this technique. 相似文献
87.
M Yasui J Kohmoto K Ota K Shinmen H Tanaka H Nogami 《Canadian Metallurgical Quarterly》1998,50(8):767-772
Histological findings and metal contents in the liver were studied in a patient with neurologic type of Wilson's disease. Copper and aluminum contents in the biopsied liver of the patient with Wilson's disease were measured simultaneously by neutron activation analysis at Research Reactor Institute, Kyoto University. Four cases of adult cirrhosis were selected as the control for cirrhosis and five cases of adult liver as the control for neurologically normal. The biopsied liver showed markedly increase in the copper content (814.4 micrograms/g: dry weight) and extremely high content of aluminum (479.4 micrograms/g: dry weight), compared to those of the controls. On the other hand, macroscopically no cirrhosis was observed and the characteristic appearances of macronodular cirrhosis failed to detect histologically. Interestingly the fibrosis or inflammation of the liver was seen faintly. It is likely that toxic metals in the liver such as aluminum, copper and manganese might be implicated in the pathogenesis of neurologic type of Wilson's disease. 相似文献
88.
89.
The author describes a secure data communication method based on the CSMA/CD protocol in bidirectional star networks. A procedure for detecting packet collision while transmitting the jamming signal is required. The author assess two kinds of protocol, a CRV (code rule violation) protocol and a DR (delayed replying) protocol 相似文献
90.
R. Świetlik A. Łapiński M. Połomska L. Ouahab A. Ota 《Journal of Low Temperature Physics》2006,142(3-4):641-645
The monoclinic crystals of κ-phase charge-transfer salts formed by BEDT-TTF with Co(CN)6 or Fe(CN)6 anions undergo a phase transition at T=150 K. Temperature dependences of FT-NIR Raman spectra and IR reflectance spectra
were studied. We show that the phase transition is related to a charge ordering and there exist charge fluctuations above
150 K. 相似文献