共查询到20条相似文献,搜索用时 15 毫秒
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Z. T. Nazarchuk V. R. Skal’s’kyi O. M. Serhienko Yu. Ya. Matviiv L. I. Hrechykhin E. D. Podloznyi 《Materials Science》2011,47(3):375-385
We propose a computational model of the emission of acoustic signals accompanying the fracture processes in composite materials
caused by the formation of several cracks regarded as separate events of macrocrack initiation. We perform the numerical analysis
of the components of the vector of displacements for some typical cases of the relative location of two simultaneously formed
penny-shaped cracks. The analysis of the modulus of the vector of displacements reveals the direct proportionality between
its maximum values and the total area of the formed defects that, as well as the inverse proportionality between the same
quantities and the period of relaxation of stresses on the cracks lips. 相似文献
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William H. Carter 《Journal of Modern Optics》2013,60(7):1461-1470
Abstract Coherence in the space-time domain and in the space-frequency domain are compared and found to be non-equivalent. Coherence in the space-time domain is sufficient for coherence in the space-frequency domain. Coherence in the space-frequency domain is not sufficient for coherence in the space-time domain. The source spectrum as well as coherence in the space-frequency domain effect coherence in the space-time domain. The coherence in the radiation field from two very different localized sources is studied. It is found that the fields are coherent throughout the far field region only if the sources are monochromatic. 相似文献
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立体视差法中距离分辨率的理论分析 总被引:4,自引:1,他引:3
推导了立本视差法中距离分辨率,探测范围,探测距离,两CCD摄象机的间距及CCD本身各参数之间的关系。利用这些关系可优化化立体视差法的结构参数。 相似文献
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一、极简主义的概念和内涵
极简主义(Minimalism)[1],并不是现今所称的简约主义,而是第二次世界大战之后60年代所兴起的一个艺术流派,作为对抽象表现主义的反动而走向极致,开放作品自身在艺术概念上的意像空间,让观者自主参与对作品的建构,最终成为作品在不特定限制下的作者. 相似文献
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文章分析了实践教学过程中几个重要环节中存在的问题,探讨了工科院校实践教学改革之路。 相似文献
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To allow the determination of the dose in quartz in the presence of feldspar contamination, the quartz-to-feldspar optically stimulated luminescence (OSL) ratio needs to be maximised. Experiments were carried out to find the optimum procedure to bleach the feldspar by exposure to infrared light, without seriously affecting the quartz OSL signal. A single-aliquot regenerative-dose protocol is proposed which, in our samples, allows accurate measurement of the dose in quartz in the presence of feldspar contamination. The protocol also has potential use for quartz dose determination in mixed-mineral samples. 相似文献
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The article presents a formula for estimating the component of uncertainty in the measurement of the relative statistical
fluctuation of the power of laser radiation caused by a finite number of measurements of power on the basis of which instability
is determined. The influence of drift on the measured radiation power is established and a formula for adding the drift and
fluctuation components of the relative statistical fluctuation is checked.
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Translated from Izmeritel’naya Tekhnika, No. 11, pp. 28–32, November, 2006 相似文献
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KEITH R. PLOSSL 《国际生产研究杂志》2013,51(3):501-506
This paper proposes an algorithm for hoist scheduling problems in a flexible PCB electroplating line where there is no buffer among workstations. Due to its chemical process nature, the processing times have to be controlled within a specified range (i.e. between a maximum processing time and a minimum processing time). The product will become defective if this constant is violated. The objective is to maximize throughput with no defective product. The proposed algorithm schedules jobs entering the system based on the specified range of processing time. A simulation study shows that the proposed algorithm outperforms the basic algorithm that schedules jobs based on the minimum processing times. 相似文献