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1.
We discuss checking policies, in which an inspector is requested to perform the check, for a ono-unit system. Applying the unique modifications of Markov renewal processes, we analyse the stochastic behaviour of each CR policy (checking request policy) and CRSL policy (checking request and surveillance limit policy), where it is assumed that the failure time for each unit and the inspector's arrival time havo arbitrary distributions. Introducing replacement eosts, the request for the inspector to perform the check, system failure and surveillance, we derive the optimal policies which maximize the cost effectiveness under suitablo conditions for each model. In particular, wo discuss the optimal policies as a non-linear programming problem with two variables. 相似文献
2.
KIJA LEE KAHO UEGAKI CHIHIRO NISHII TADASHI NAKAMURA AUSKA KUBOTA TSUNAO HIRAI KAZUTAKA YAMADA 《International Journal of Dairy Technology》2012,65(2):232-236
Computed tomography (CT) was performed on Gouda‐type cheese during ripening to evaluate gas hole formation and structural quality. The cheese was exposed to different ripening conditions, including variations in ripening temperature and concentration of butyric acid bacteria. Computed tomography images were obtained every 2 weeks for 16 weeks to assess the volume, shape and location of gas holes. The results demonstrate that CT makes the nondestructive monitoring of cheese gas hole formation and evaluation of the structural features of cheese possible throughout the ripening period. 相似文献
3.
It is confirmed experimentally that a “Diffusion controlled slow reaction model'“ explains very well the alkaline hydrolysis of n-amyl acetate at constant inlerfacial area. Mass transfer coefficient obtained from the model agrees well with that obtained from pure mass transfer experiment. Mass transfer coefficient can be correlated against Reynolds number, Schmidt number and vessel dimensions. Effect of diluents and solutes can also be explained using the above model. From the extraction rate of H-amyl acetate dispersed in aqueous phase in an agitated vessel, the second order reaction rate constant for hydrolysis of the ester with alkali in aqueous phase is estimated based on the above model. The estimated value of second order reaction rate constant for H-amyl acetate is almost identical to that for iso-amyl acetate or n-butyl acetate. 相似文献
4.
J TAKAHASHI K KAGEYAMA T FUJII T YAMADA K KODAIRA 《Journal of Materials Science: Materials in Electronics》1997,8(2):79-84
The Sr(Ga0.5Ta0.5)O3-based perovskites with O2- and/or Sr2+ vacancies were formed by changing the A-site and/or B-site cation
ratios. The Sr-deficient perovskites with a limited composition of Sr0.86(Ga0.36Ta0.64)O3 could be obtained, whereas oxygen
vacancies were hardly created. The B′-site Ga3+ cation could be replaced with large Sc3+, In3+, Y3+, Nd3+ and La3+. The crystal
symmetry of the complex perovskites changed from cubic (B′=Ga3+, Sc3+, In3+) to tetragonal (B′=La3+) through rhombohedral
(B′=Y3+, Nd3+). The dielectric permittivities of these ceramics indicated no distinct dependence on the B′-site cation species.
The temperature coefficient of permittivity might be associated with the symmetry change of the perovskite phases. Higher
microwave Qf values, >Qf=38 000 GHz, were obtained for our complex perovskite ceramics, except with B′=La3+.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
5.
FATIGUE CRACK PROPAGATION IN BIAXIAL STRESS FIELDS 总被引:1,自引:0,他引:1
K. TANAKA T. HOSHIDE A. YAMADA S. TAIRA 《Fatigue & Fracture of Engineering Materials & Structures》1979,2(2):181-194
Abstract Biaxial tension-compression fatigue tests were conducted with cruciform shaped specimens in a closed-loop servo hydraulic testing machine. The effects of static and cyclic non-singular stresses acting parallel to the crack plane on the crack growth rate are discussed based on the experimental observations of crack opening behaviour and fractography. Those non-singular stresses did affect the growth rate significantly under certain conditions. The range of crack-tip opening displacement was found to be a better parameter in correlating the growth rate than the stress intensity range or its effective range. The rate tended to increase with increasing non-singular stress which is correlated to the opening displacement range. This tendency was explained by the shift of fracture mechanisms to a more brittle type due to a higher elevation of hydrostatic stress near the crack tip for the case of a larger non-singular stress term. 相似文献
6.
河野久征 《分析测试仪器通讯》1996,6(2):82-89
采用m样品:m熔剂为1:2的低稀释比玻璃熔融技术,X射线荧光法测定岩石中的主成分和微量成分,既提高了灵敏度又不均质效应。与粉末压片方法相比,对硫的分析得到了更好的结果。同时,使用基本参数程序建立了一种新的校正方法来校正由于烧失量、烧增量、释释比或熔剂挥发而导致的分析误差。 相似文献
7.
8.
JUN'ICHI NAKANO TOMOAKI YAMADA SHINTARO MIYAZAWA 《Journal of the American Ceramic Society》1979,62(9-10):465-467
In the ternary system Li2 O-Nd2 O3 -P2 05 , part of the phase diagram relevant to the growth of single LindP4 O12 (LNP) crystals was examined. LNP melts incongruently and decomposes into NdP3 O9 and liquid at the peritectic temperature of 970°C. For the crystal growth, an Li2 O-P2 O5 mixture should be used as a flux. The melt compositions from which LNP nucleates were clarified. 相似文献
9.
DISPERSION STATE OF PROTEIN-STABILIZED EMULSIONS 总被引:1,自引:0,他引:1
TOMOYOSHI MITA EIKO IGUCHI KENICHI YAMADA SACHIO MATSUMOTO‡ DAIZO YONEZAWA 《Journal of texture studies》1974,5(1):89-96
The stability of concentrated benzene-in-water emulsions emulsified by bovine serum albumin (BSA) in the presence of various concentrations of sodium chloride has been measured in the light of the coalescence kinetics. On the acid and alkaline sides of the isoelectric point of BSA (pH 4.9), the rate of coalescence between globules decreased and approached that at the isoelectric point of BSA with increasing concentrations of sodium chloride. In these systems, the interfacial tension at the benzene/aqueous BSA solution interface, and the globule size distribution in the emulsions, reached the values observed at the isoelectric point when the concentration of sodium chloride was above about 50 mM. The role of the adsorbed film of BSA on the surface of dispersed globules is considered in relation to the dissociation state of the BSA molecules. 相似文献
10.
HAYATOSHI YAMADA 《电力部件与系统》2013,41(3):215-224
ABSTRACT In this paper flux distribution by finite element method in the solid rotor with enclosed slot induction motor compared with the flux distribution in the laminate core rotor with enclosed slot is examined. This paper also presents a method of deriving the reactance from the magnetic energy stored at the portion of the rotor surface. The method of calculating the reactance of the slot tip of an induction motor with enclosed slots is examined. The starting performance calculation of this motor are also described. Explanation is made here in the order as follows: Equivalent circuit of enclosed slot solid rotor induction motor, Flux distribution in the solid rotor with enclosed slots, Method of deriving the reactance from stored and accumulated magnetic energy, Calculation of the flux distribution, Examples of calculations on the reactance of the slot tip, Results of calculation and measurement on characteristics of the tested motor. The method of deriving the reactance from the magnetic energy stored in the surface region of the core is considered to be utilizable widely in the technology of magnetic circuits involving non-linear magnetic characteristics 相似文献