Localization of Luminescent Inhomogeneities in Turbid Media with Spatially Resolved Measurements of cw Diffuse Luminescence Emittance

We present a steady-state method for localizing a source ofluminescence (i.e., fluorescence or phosphorescence) buried in asemi-infinite turbid medium with unknown optical properties. Adiffusion theory expression describing the emittance of an isotropicpoint source is fit to spatially resolved surface measurements of thediffuse emittance from the luminescent source. The techniquereports the location of the center of a 6.0-mm-diameter, fluorophore-containing spherical bulb embedded in a liquid phantom withan accuracy of 1.0 mm or better for source depths as great as 40.0mm. Monte Carlo data are analyzed to investigate the range and thepossible sources of error in the reconstructed source depth.     

Range of validity of the Rayleigh-Debye-Gans theory for optics of fractal aggregates

The range of validity of the Rayleigh-Debye-Gans approximation for the optical cross sections of fractal aggregates (RDG-FA) that are formed by uniform small particles was evaluated in comparison with the integral equation formulation for scattering (IEFS), which accounts for the effects of multiple scattering and self-interaction. Numerical simulations were performed to create aggregates that exhibit mass fractallike characteristics with a wide range of particle and aggregate sizes and morphologies, including x(p) = 0.01-1.0, ‖m - 1‖ = 0.1-2.0, N = 16-256, and D(f) = 1.0-3.0. The percent differences between both scattering theories were presented as error contour charts in the ‖m - 1‖x(p) domains for various size aggregates, emphasizing fractal properties representative of diffusion-limited cluster-cluster aggregation. These charts conveniently identified the regions in which the differences were less than 10%, between 10% and 30%, and more than 30% for easy to use general guidelines for suitability of the RDG-FA theory in any scattering applications of interest, such as laser-based particulate diagnostics. Various types of aggregate geometry ranging from straight chains (D(f) ≈ 1.0) to compact clusters (D(f) ≈ 3.0) were also considered for generalization of the findings. For the present computational conditions, the RDG-FA theory yielded accurate predictions to within 10% for ‖m - 1‖ to approximately 1 or more as long as the primary particles in aggregates were within the Rayleigh scattering limit (x(p) ≤ 0.3). Additionally, the effect of fractal dimension on the performance of the RDG-FA was generally found to be insignificant. The results suggested that the RDG-FA theory is a reasonable approximation for optics of a wide range of fractal aggregates, considerably extending its domain of applicability.     

Scanning optical microellipsometer for pure surface profiling

We describe a scanning optical interferometer that can simultaneously perform ellipsometry measurements and thus provides a true surface profile. This is accomplished by projecting the back focal plane of the objective lens onto a CCD array. The measured phase differences between the p- and s-polarization components are converted, by using a specially developed algorithm, to optical phase changes caused by material variations. The compensation process is then applied to extract the true profile of the object surface. Experimental results obtained with the system are shown.     

基于S7-300PLC的多路气体在线分析系统设计

针对手动控制多路气体分析过程存在多路气体交叉污染、分析过程不流畅、分析过程耗时长、效率低等问题,设计了基于PLC控制器、GC-17A气相色谱分析仪的多路气体在线分析控制系统,给出了控制系统的软硬件设计过程,实现了气体分析过程中气体采集、气路控制、气体数据处理过程的自动化作业.     

基于属性子空间的孤立点内涵知识挖掘

孤立点通常都包含着重要的信息,挖掘出孤立点的内涵知识可以帮助用户更好地认知数据。通过给出的孤立点的原因属性子空间及其孤立度和孤立点的相似度等概念,提出了一个基于属性子空间的孤立点内涵知识挖掘算法,得到了每个孤立点的原因属性集,并结合聚类的思想把孤立点按照其相似性特征进行了分类,使每一类中的所有孤立点在一定精度下都具有相同的原因属性集。实验结果表明该算法是有效和实用的,且易用性较强。     

汉英翻译系统英文生成中选词模型的设计

本文描述了一种基于实例比较,辅以语义模式匹配的英文选词模型的设计。首先,我们讨论了汉英翻译系统英文生成中选词的重要性,然后比较了几种可能的选词策略并提出我们的选词模型,接着我们较详细地描述了生成词典的结构以及选词算法。文中,我们还简要介绍了我们所使用的语义知识资源——《知网》。     

中国软件市场谁在瓜分

最近看了一个ＩＤＣ的研究成果,不禁 浮想联翩：谁会主宰中国软件市场？中国软件未来会怎样呢？ ＩＤＣ的报告说出了这样一个事实．ＩＢＭ在中国市场上是单个公司里的老大。它的报告说,２０００年,ＩＢＭ软件在中国地区销售额为７８００万美元,占６．０８％．列第一位;微软为６５０７万美元．占５．０７％列第二;Ｏｒａｃｌｅ的５８２８万美元占４．５５％,列第三;Ｓｙｂａｓｅ第四,３０９３万美元占２．４１％;ＣＡ以２．０１％和２５７４万美元列第六。前１０名中,Ｉｎｆｏｒｍｉｘ列第五,销售额２６３３万美元,份额２．０５…     

2001年度上海城市信息化发展研究课题评标结果公布

资料：Ａｃｅｒ Ｖｅｒｉｔｏｎ ３２００,采用ＰＩＩＩ１ＧＨｚ处理器、１２８ＭＢ内存、１５英寸ＬＣＤ彩显、４０ＧＢ硬盘、５０速ＣＤ－ＲＯＭ、内建网卡声卡５６Ｋｂｐｓ Ｍｏｄｅｍ、Ｗｉｎｄｏｗｓ　Ｍｅ简体中文,报价１１３００元。Ａｃｅｒ Ｖｅｒｉｔｏｎ ３２００－Ｍ,采用ＰＩＩＩ１ＧＨｚ处理器、１２８ＭＢ内存、１５英寸ＬＣＤ彩星、４００ＧＢ硬盘、５０速ＣＤ－ＲＯＭ、内建网卡声卡５６Ｋｂｐｓ Ｍｏｄｅｍ、Ｌｉｎｕｘ简体中文,报价１０８００元。Ａｃｅｒ Ｖｅｒｉｔｏｎ ３２００－Ｃ,采用ＰＩＩＩ１ＧＨｚ处理器…     

微软像不像大毒枭

微软像不像大毒枭,全世界都中了Windows的毒．中了Office系列应用软件的毒,不能自拔,不能自己,像有了瘾一样的依赖微软产品,它不是毒枭又是什么,之所以做如此感慨,是因为,6月19日,微软在北京发布了Office XP中文版产品。一时间,北京的重心向国贸倾斜了,因为微软把太多的人吸引了过去。     

Vascular proteomics

The characterization of patients with acute coronary syndromes (ACS) at the molecular and cellular levels provides a novel vision for understanding the pathological and clinical expression of the disease. Recent advances in proteomic technologies permit the evaluation of systematic changes in protein expression in many biological systems and have been extensively applied to cardiovascular diseases (CVD). The cardiovascular system is in permanent intimate contact with blood, making blood-based biomarker discovery a particularly worthwhile approach. Thus, proteomics can potentially yield novel biomarkers reflecting CVD, establish earlier detection strategies, and monitor response to therapy. Here we review the different proteomic strategies used in the study of atherosclerosis and the novel proteins differentially expressed and secreted by atherosclerotic lesions which constitute novel potential biomarkers (HSP-27, Cathepsin D). Special attention is paid to MS-Imaging of atheroma plaque and the generation, for the first time, of 2-D images of lipids, showing the distribution of these molecules in the different areas of the atherosclerotic lesions. In addition new potential biomarkers have been identified in plasma (amyloid A1α, transtherytin), circulating cells (protein profile in monocytes from ACS patients) and individual cells constituents of atheroma plaques (endothelial, VSMC, macrophages) which provide novel insights into vascular pathophysiology.