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21.
P. S. Koutsourelakis H. J. Pradlwarter G. I. Schuëller 《Probabilistic Engineering Mechanics》2004,19(4):409-417
The present paper is concerned with the estimation of structural reliability when a large number of random variables is present. A sampling technique which uses lines in order to probe the failure domain, is presented. The latter is employed in conjunction with a stepwise procedure which makes use of Markov Chains. The resulting algorithm exhibits accelerated convergence. 相似文献
22.
A semi-Markov model is constructed that describes an arbitrarily structured multicomponent technological system and takes
into account its calendar maintenance. Using an aggregation algorithm, approximate values of stationary reliability characteristics
and an optimal term of maintenance work are determined for the system.
__________
Translated from Kibernetika i Sistemnyi Analiz, No. 2, pp. 69–86, March–April 2006. 相似文献
23.
Stephen J. Spells 《Polymer》1985,26(13):1921-1928
The chain conformation of solution-crystallized polyethylene has previously been confirmed by infra-red spectroscopy, using the CD2 bending bandshape for samples with a minority of the deuterated species1–3. The method of calculating the i.r. band profile from molecular conformational models is now developed to give a more accurate representation of doublet splittings and to include the singlet component. The CH2 bending profile is calculated for samples with a deuterated matrix, and the good agreement with experimental data indicates that the same molecular model is applicable for samples with the deuterated polymer as either guest or matrix, for identical crystallization conditions. This result implies that isotopic fractionation is unimportant under these conditions. 相似文献
24.
Hot electron transport across graded compound semiconductor heterojunctions has been explored using a two-dimensional formulation of the self-consistent ensemble Monte Carlo method. The AlxGa1-xAs/GaAs heterojunction imbedded into a vertical field effect transistor with two ohmic contacts (source, drain) and two lateral Schottky gates has been used as an example. Lateral space charges modulated by the gates are shown to control ballistic injection of electrons over the heterojunction under steady state conditions. The transient response to a gate pulse is found to be determined by carrier transit from the heavily doped source contact region into the channel. A conceptual one-dimensional section model is used to explain the Monte Carlo results. 相似文献
25.
供应链管理的研究综述 总被引:31,自引:0,他引:31
首先阐述了供应链管理的概念,在此基础之上提出目前供应链的研究框架,并指出供应链管理实践中存在的问题,最后提出未来研究方向。 相似文献
26.
The syntheses of polyenynes as model compounds for poly(diacetylene)s (PDAs) are described. Variation of properties (UV–VIS, Raman, NMR and bond geometries) as a function of the chain length was investigated. After extrapolation to infinite chain length these data were compared to those for PDAs. From UV–VIS spectra a value of λ = 551 nm (2.25 eV) was calculated corresponding to the electronic transition of a single polyenyne chain. This energy is located at the low energy end of a yellow PDA solution spectrum. From Raman scattering v(C?C) = 2108–2128 cm?1 and v(C?C) = 1505–1532 cm?1 were calculated after extrapolation. Similarly sp-C13C NMR data yielded a shift of δ = 100 ppm. These data are almost identical to data known for yellow PDA solutions. Bond geometries are almost identical to those of poly(diacetylene)s and theoretical data. 相似文献
27.
Long-Wen Chang Shui-kung Chuag Shang-shung Yu 《Multidimensional Systems and Signal Processing》1994,5(3):319-330
The compression of Chinese characters is very important for Chinese office automation and desktop publishing. In this paper, various methods are used to compress 13,051 Chinese characters losslessly by coding their skeleton points. The skeleton points are composed of isolated points and curves. To trace every point in a curve once and consecutively is a NP problem. Therefore, we use contour path following and revisiting algorithms to trace skeleton curves with chain codes. The remaining isolated skeleton points are encoded by an Elias code. Our coding method has a better compression rate than that of conventional skeleton coding. 相似文献
28.
蒙特卡洛法速度谱的自动拾取 总被引:3,自引:3,他引:0
蒙特卡洛速度谱的自动拾取采用一种非线性优化的快速方法,所得叠加速度的精度可以满足常规地震资料处理中叠加的要求,转换为层速度后可用于叠前深度偏移成象,在给定初始速度模型前提下建立优化目标函数。采用蒙特卡洛非线性优化算法,以最大相似度量准则在考虑实际地质条件前提下给出速度约束条件,对初始速度模型加以扰动,自动寻找速度谱中叠加能量的全局最优解,从而获得合理的速度模型。实际地震资料处理的应用结果表明,自动拾取速度谱比常规的人工速度谱解释工作的效率大幅度提高。在SUN Ultra60机上,仅需1h即可完成2000km的地震资料的速度谱拾取任务,而且所获得的速度模型不受人为因素影响,转换所得的层速度模型用于叠前深度偏移后,获得了满意的成象效果。 相似文献
29.
丙烯酸高碳醇酯的合成 总被引:1,自引:0,他引:1
介绍了降凝剂中间体丙烯酸高碳醇酯的合成和产品分离提纯方法。考察了合成条件对酯化反应的影响,结果表明,在原料丙烯酸与十八醇摩尔比1.2:1,阻聚剂对苯二酚用量占原料总量1.5%,催化剂对甲苯磺酸用量占原料总量1.5%,反应温度80-86℃,回流反应时间6h条件下,酯化率最高达89%。产品分离提纯方法与传统分离方法比较,所需分离时间短,洗涤用水量少,而产品收率远高于传统分离方法,达95%以上。 相似文献
30.
Ozgur Sinanoglu Ismet Bayraktaroglu Alex Orailoglu 《Journal of Electronic Testing》2003,19(4):457-467
Parallel test application helps reduce the otherwise considerable test times in SOCs; yet its applicability is limited by average and peak power considerations. The typical test vector loading techniques result in frequent transitions in the scan chain, which in turn reflect into significant levels of circuit switching unnecessarily. Judicious utilization of logic in the scan chain can help reduce transitions while loading the test vector needed. The transitions embedded in both test stimuli and the responses are handled through scan chain modifications consisting of logic gate insertion between scan cells as well as inversion of capture paths. No performance degradation ensues as these modifications have no impact on functional execution. To reduce average and peak power, we herein propose computationally efficient schemes that identify the location and the type of logic to be inserted. The experimental results confirm the significant reductions in test power possible under the proposed scheme. 相似文献