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991.
二、大坝基础基础地质伊泰普混凝土建筑物基岩为厚度20~60米的玄武岩流。较厚的岩流中,有因熔岩冷却收缩时所产生的水平和垂直断裂,许多擦痕面表明,沿某些断裂面有数毫米的错动。一些熔岩流的表面已被风积层所掩盖。从坝的稳定观点来看,摩阻力低而且沿可能破坏面没有明显的不平度的近水平的不连续面是值得重视的,自1972年以来,对坝址进行了全面 相似文献
992.
Shyam N. Prasad S. Madhusudana Rao Mathias J. M. Roemkens 《人民黄河》2005,27(11):69-69
流域上游地区的土壤侵蚀及与其相关的泥沙运移是影响流域地表径流水质的重要过程,被侵蚀的泥沙大部分由坡面流输移,目前的泥沙输移关系都是从剪切力概念或河道能量概念引出的,而这些概念却都是仅仅基于流体力学的。泥沙的运移都单一地依赖于水流剪切力或能量的阈值条件,这一理论的前提是:①泥沙初始运移需要的最小剪切力或临界剪切力,或者最小、临界河道能量;②泥沙输移率和剪切力或河道能量与其临界值的差值密切相关。这些关系或许可以用来描述泥沙在河道中的输移,却不能反映出泥沙在宽浅坡面流中输移的微观机制或物理过程。流域的上游地区,在上临界弗如德数的水力条件下,坡面流含沙量的变化范围非常大。在宽浅坡面流的试验研究中,泥沙按照逐步控制方式添加到坡面流中,并且通过测量来确定颗粒速度与含沙量之问的关系。在不同的水力条件下,存在最大的泥沙输移率,对泥沙颗粒运移的观测表明:泥沙输移方式是跳跃式的,在这些条件下,水流状态受控于包含了很大部分动能的滚动波,因此滚动波是薄层流泥沙侵蚀及输移过程中的主要能量来源。 相似文献
993.
Image blurring of MeV transmission electrons for gold nanoparticles on the top surface of micrometer-thick specimens has been investigated using the Monte Carlo simulation. Both the simulated line density profile and therefore image blurring were in good agreement with the experimental ones in the ultrahigh voltage electron microscope. Quantitative effects of specimen thickness and electron energy on image blurring were presented, in which the specimen thickness had a greater influence. Image blurring was demonstrated to be caused mainly by multiple elastic scattering, but it could be reduced to several nanometers for a 5?μm thick epoxy-resin specimen at the electron energy of 2?MeV. 相似文献
994.
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996.
Locating blood vessels in retinal images by piecewise threshold probing of a matched filter response 总被引:10,自引:0,他引:10
We describe an automated method to locate and outline blood vessels in images of the ocular fundus. Such a tool should prove useful to eye care specialists for purposes of patient screening, treatment evaluation, and clinical study. Our method differs from previously known methods in that it uses local and global vessel features cooperatively to segment the vessel network. We evaluate our method using hand-labeled ground truth segmentations of 20 images. A plot of the operating characteristic shows that our method reduces false positives by as much as 15 times over basic thresholding of a matched filter response (MFR), at up to a 75% true positive rate. For a baseline, we also compared the ground truth against a second hand-labeling, yielding a 90% true positive and a 4% false positive detection rate, on average. These numbers suggest there is still room for a 15% true positive rate improvement, with the same false positive rate, over our method. We are making all our images and hand labelings publicly available for interested researchers to use in evaluating related methods. 相似文献
997.
Fu Y Willander M 《红外与毫米波学报》2002,21(5):321-326
IntroductionInfrareddetectortechniquehasbeenakeyfactorinthedevelopmentoftheinfraredtechnologyformorethan 4 0 years .Since 1970 ,semiconductorslikeInSbandHgCdTehavebeentheprincipalmaterialsforvariousinfrareddetectorapplications .Theformatoftheinfrareddetectormotivatedbysmartthermalimagingsystemchangedfromsingleelementdevicetofocalplanarrays(FPAs)inthemiddleof 80’s [1].Today’stechnologyofinfrareddetectorconcentrateslargelyonfocalplanarrays ,expeciallyforsensitive ,homogeneousandlargeformatscaledevices .HgCdTe... 相似文献
998.
本文介绍纪录高分辨率红外吸收光谱的一台带二极激光器的完整的分光计。其光学装置不仅适合二极管激光器的特点,而且也可以与其它激光光源连用。由于采用双光束技术,解决了激光功率变化的问题。本文还讨论光学调校和电子信号检测问题,并且介绍其典型光谱。 相似文献
999.
Research on Laser Direct Deposition Process of Ti-6Al-4V Alloy 总被引:2,自引:0,他引:2
S.Y. Gao Y.Z. Zhang L.K. Shi B.L. Du M.Z. Xi H.Z. Ji 《金属学报(英文版)》2007,20(3):171-180
Laser direct deposition (LDD) of metallic components is an advanced technology of combining CAD/CAM (computer aided design/computer aided manufacturing), high power laser, and rapid prototyping. This technology uses laser beam to melt the powders fed coaxiaUy into the molten pool by the laser beam to fabricate fuUy dense metallic components. The present article mainly studies the LDD of Ti-6Al-4V alloy, which can be used to fabricate aircraft components. The mechanical properties of the Ti-6Al-4V alloy, fabricated by LDD, are obtained using the tension test, and the oxygen content of used powders and deposited specimens are measured. In the present article, it can be seen that the mechanical properties obtained using this method are higher than the ones obtained by casting, and equal to those got by wrought anneal. One aircraft part has been made using the LDD process. Because of this aircraft part, with sophisticated shape, the effect of the laser scanning track on the internal soundness of the deposited part was discussed. 相似文献
1000.
F.J. Liu M.C. Zhang J.X. Dong Y. W. Zhang 《金属学报(英文版)》2007,20(2):102-110
High temperature oxidation behaviors of FGH96 P/M superalloy have been studied in air at temperatures ranging from 600 to 1000℃. By means of isothermal oxidation testing,X-ray diffraction,SEM(scanning electron microscopy),and EDS(energy dispersive X-ray spectroscopy) analyses,the oxidation kinetics as well as the composition and morphology of scales were investigated. Thermodynamic calculations were used to explain the oxidation mechanism. The results showed that as the oxidation temperature increased,the oxidation rate,the scale thickness,and scale spallation increased. FGH96 P/M superalloy exhibits good oxidation resistance at temperature below 800℃. The oxidation kinetics follows an approximately parabolic rate law,and the oxide layer was mainly composed of Cr2O3,TiO2,and a little amount of NiCr2O4. The oxidation is controlled by the transmission of chromium,titanium,and oxygen through the oxide scale. 相似文献