基于图像直方图的一维不变矩研究

由于基准日与实测图之间存在灰度变化，基于灰度不变矩的匹配方法不能满足实际匹配的要求．图像灰度变化时，对应的直方图基本形状保持不变．据此定义了基于直方围的一维不变矩，并提出基于直方图不变矩的匹配方法．由于直方图不变矩是基于一维矩的定义，运算时间大大减少．     

在片学习及权值刷新神经网络硬件实现方法

提出几种电流模式电路块，并用这些模拟电路块构成一个电流模型式ＢＰ人工神网络，该ＢＰ神经网络具有在片学习和在片权值存储能力。对所设计的模拟电路块进行了理论对构成的ＢＰ神经网络作了应用实例研究，并提供了ＰＳＰＩＣＥ仿真结果。     

脂肪醇氧化制取脂肪醛

利用混合脂肪醇减压蒸馏获得的 C_8、C_9、C_(10)、C_(11)醇,在电解银催化剂存在下,氧化制取相应脂肪醛。研究了反应条件对转化率、选择性和收率的影响。转化率、选择性达到了90%以上。     

Photoreceptor damage following exposure to excess riboflavin

Flavins generate oxidants during metabolism and when exposed to light. Here we report that the photoreceptor layer of retinas from black-eyed rats is reduced in size by a dietary regime containing excess riboflavin. The effect of excess riboflavin was dose-dependent and was manifested by a decrease in photoreceptor length. This decrease was due in part to a reduction in the thickness of the outer nuclear layer, a structure formed from stacked photoreceptor nuclei. These changes were accompanied by an increase in photoreceptor outer segment autofluorescence following illumination at 328 nm, a wavelength that corresponds to the excitation maxima of oxidized lipopigments of the retinal pigment epithelium.     

企业创新成长模式探析

实施《国家中长期科学和技术发展规划纲要（2006-2020年）》，建设创新型国家，是全面落实科学发展观．开创社会主义现代化建设新局面的重大战略举措．其核心就是把增强自主创新能力作为发展科学技术的战略基点，走具有中国特色创新道路，推动科学技术的跨越式发展。     

Homocysteine increases the synthesis of adrenomedullin in vascular fibroblasts of rats

Homocysteine (Hcy), a highly reactive sulfur- containing amino acid, is an intermediate product of methionine metabolism. Elevation of plasma Hcy has been widely studied as an independent risk factor for many cardiovascular diseases such as atherosclerosis, thrombosis, etc.[1]. Inherited hyperhomocysteinemia cases usually suffer from occlusion or thrombosis in arteries and large veins before the age of 20. Hyperhomocysteinemia significantly reduces the survival rate[2] and dilatation functi…     

Measuring radial Young’s modulus of DNA by tapping mode AFM

Based on tapping mode AFM imaging, a method was demonstrated to evaluate compression elasticity of single double-stranded DNA （dsDNA） molecules in the force region. With images under ambient conditions, Young＇s moduli of dsDNA in compression were calculated. Results demonstrated that Young＇s moduli of dsDNA can be simply deduced according to the proposed model. The method can also be used to evaluate the compression elasticity of similar soft nanomaterials.     

Wavelet Numerical Solutions for Weakly Singular Fredholm Integral Equations of the Second Kind

Daubechies interval wavelet is used to solve numerically weakly singular Fredholm integral equations of the second kind. Utilizing the orthogonality of the wavelet basis,the integral equation is reduced into a linear system of equations. The vanishing moments of the wavelet make the wavelet coefficient matrices sparse,while the continuity of the derivative functions of basis overcomes naturally the singular problem of the integral solution. The uniform convergence of the approximate solution by the wavelet method is proved and the error bound is given. Finally,numerical example is presented to show the application of the wavelet method.     

基于Gauss滤波的多媒体图像的可视化检索

基于图像的可视化特征的图像检索和查询，是当前多媒体系统的重要研究方向。对于基于图像局部匹配的检索，传统的模板匹配和区域分割方法只能在目标图像中检索非常相似的对象，对尺度或形状有较大变化的目标则难以得到满意的结果。提出了一种不依赖于模板匹配的方法——图像的多尺度高斯滤波表示，用于图像的特征提取和局部匹配，并在分布并行索引结构下实现了该方法的快速索引和搜索算法。实验表明，该方法能够在较大尺度和视角变化范围内，更有效地进行图像的特征提取和检索，对基于图像局部区域相似性的匹配能达到较好的效果。