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热成像系统及医学热诊断技术 总被引:2,自引:0,他引:2
医学热诊断是热成像技术的重要应用领域之一,目前其应用条件逐步成熟,为了促进医学热诊断的应用,本文介绍了医学热诊断仪的基本原理及其主要技术性能指标。以及国内外一结医学热诊断的应用实例,并分析了当前限制医学热诊断技术应用的主要因素,展望了这一技术今后的发展前景。 相似文献
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DANIEL BÉGIN Q. H. J. GWYN FERDINAND BONN 《International journal of remote sensing》2013,34(3):385-398
Abstract Spatial variations of the backscatter coefficient result from synthetic aperture radar imaging systems and their platforms. An adaptive algorithm has been developed to correct the multiplicative variation of the backscatter in the longitudinal (parallel to flight line) and lateral (perpendicular to flight line) directions. The coefficient of variation along the parallel and lateral profiles, which consist of the means of the pixels along these lines perpendicular to the respective profiles, is constant. This implies that the radiometric variations are multiplicative. Because standard correction methods such as polynomial transfer functions give unsatisfactory results, an adaptive correction algorithm was developed to correct these images. The algorithm produces a transfer function by means of a filtering window which moves along the profile in what is essentially a moving mean procedure. However, the length of the window is automatically adjusted as a function of the variation of the profile. The adjustment is based on a calculation of the probability that values to be included or excluded from the window belong to the included population. The effects of the successive correction steps were monitored using several thematic test sites. The resultant images provide both increased quality and quantity of data without any degradation of the statistical properties of the data. 相似文献
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高速公路长大隧道施工塌方及处理方案研究 总被引:1,自引:0,他引:1
绩-黄高速佛岭隧道施工期间出现局部塌方,对塌方洞穴面进行喷射混凝土封闭,沿岩面安装钢筋网,用钢拱架支撑,最后采用模筑混凝土和小导管注浆方法加固处理,处理后围岩变形监测结果表明处理方案合理可行,加固效果良好。 相似文献
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为从微观角度研究裂隙对玻璃固化体腐蚀影响,引入体视学方法对玻璃体裂隙进行了裂隙分布、腐蚀程度等初步研究。采用扫描电镜对结束1147d静态浸出实验后的全体积R7T7型参考玻璃的部分样品进行分析。根据分析得到的二维参数,通过体视学方法计算得到全体积玻璃体的裂隙率FR为41±13,腐蚀量为(3.88±1.20)×10-4m3,约占玻璃体参与水相腐蚀反应总体积的(0.28±0.09)%。分析还发现,裂隙腐蚀产物厚度小于10μm的裂隙占裂隙总数的80%,这些裂隙导致的腐蚀仅占总腐蚀表面积的30%;同时,腐蚀产物厚度大于10μm的裂隙对样品总腐蚀表面积贡献了70%。 相似文献
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