负二项(2)风险过程的破产概率

考虑了索赔发生的时间间隔为负二项(2)分布的离散时间风险模型,得出其无限时间生存概率的递推解和复合几何形式的显示解,并给出了当初值为0和1时它的具体表达式.最后计算得出索赔为几何分布时生存概率的具体形式.     

改性Y型分子筛的微孔结构分析

对六种不同性质的Y型沸石分子筛进行了吸附等温线的测定,对等温线的脱附支数据进行了微孔分析的计算。对相对压力P/P_0≥0.3(孔径r>1.5mm)段,可采用BJH法计算中孔孔径分布;对P/P_0≤0.3段,可采用MMP法计算微孔孔径分布。在MMP法中引入了N_2分子平均单层厚度t_m,减少了计算结果的波动。研究表明,HY具有r=1.5～2.4nm的二次孔,用EDTA和(NH_4)_2SiF_6脱铝的Y型沸石,具有更多更宽分布的二次孔,超稳Y的二次孔一直延伸到r>5nm。     

门槛区疲劳损伤模型——(Ⅰ)剪切滑移机制

本文提出疲劳损伤单元概念,并使用非局部裂纹解对疲劳损伤单元进行了应力分析,从而导出单纯晶粒尺度变化情况剪切滑移机制门槛值公式:△K_(th)=A+Bd~(1/2),这与众多实验结果所得出的经验公式相吻合。对剪切滑移机制疲劳断裂的其它情况,门槛值公式可在上式基础上修正导出。     

热处理对Zn薄膜表面的ZnO一维纳米结构和性能的影响

本文在低真空中热处理生长在Zn薄膜上的ZnO纳米丝，并对处理前后的ZnO纳米线样品进行结构和光学性质分析。研究发现，热处理中，ZnO纳米丝继续生长，有明显的择优生长，而由于引入大量的间隙锌，使得520nm的深能级发光蜂强度得到加强。     

AutoGDeterm: Automatic Geometry Determination for Electron Tomography

Electron Tomography(ET) is an important method for studying cell ultrastructure in three-dimensional(3 D) space. By combining cryo-electron tomography of frozen-hydrated samples(cryo-ET) and a sub-tomogram averaging approach, ET has recently reached sub-nanometer resolution, thereby realizing the capability for gaining direct insights into function and mechanism. To obtain a high-resolution 3 D ET reconstruction, alignment and geometry determination of the ET tilt series are necessary. However, typical methods for determining geometry require human intervention, which is not only subjective and easily introduces errors, but is also labor intensive for high-throughput tomographic reconstructions. To overcome these problems, we have developed an automatic geometry-determination method, called Auto GDeterm. By taking advantage of the high-contrast re-projections of the Iterative Compressed-sensing Optimized Non-Uniform Fast Fourier Transform(NUFFT) reconstruction(ICON)and a series of numerical analysis methods, Auto GDeterm achieves high-precision fully automated geometry determination. Experimental results on simulated and resin-embedded datasets show that the accuracy of Auto GDeterm is high and comparable to that of the typical "manual positioning" method. We have made Auto GDeterm available as software, which can be freely downloaded from our website http://ear.ict.ac.cn.     

Effects of heavy metal on dielectric properties of E. coli revealed by dielectric spectroscopy

Dielectric spectroscopy of E. coli cell before and after exposure to heavy metals Cd^2＋ , Cu^2＋ , Zn^2＋ and Ca^2＋ was investigated. The results indicate that changes in dielectric spectra reflect effects of heavy metal on the structure and function of E. coli cells. Heavy metal can change membrane capacitance as well as pennittivity and conductivity of the cytoplasm. Changes in volume fraction suggested that dielectric measurement could monitor the growth of E. coli cells. These results demonstrated that dielectric spectroscopy was a potential effective technique for studying electric properties of biological cells.     

预防青少年犯罪的可行性对策

随着人际交往范围的不断扩大,处于成长期的青少年由于思维活跃,接受能力强但判断力欠缺等诸多原因,在生活中出现了令人担忧的犯罪行为,这是一个世界性的难题。青少年犯罪给社会带来的影响不容忽视。预防青少年犯罪是每个社会人的责任,制定相应的对策是保证青少年健康成长的指南。     

Research and Application of the Mathematic Model for the Washing Shrinkage of Woven Fabric

Having analyzed the relationships between washing shrinkage and weaving technique, parameters, material properties of woven fabrics and studied the shrinkage mechanism and its mathematical model of the plain fabric,researchers set up a shrinkage model of the twills and satins and proposed a method for calculating the washing shrinkage based on weaving technique and parameters of fabrics. Shrinkage experiments of silk habotai, silk twill and silk satin fabrics were performed. The results were compared with those of the theoretical computations, and it has been proven that the theoretical method is reliable.     

基于Web Services的模型复用研究

从建模方法与建模语言、模型转换、模型描述信息定义与组织管理、模型软件复用四个方面分析模型复用的研究现状,指出目前模型复用研究的不足;结合Web Services技术,分析了基于Web Services的模型服务生成、模型服务表示、模型服务集成应用等问题;最后结合实例给出了基于Web Services的模型服务开发与集成应用过程。通过实例研究,初步验证基于Web Services技术将可以构建模型服务、并通过服务集成实现模型应用,这进一步提高了模型复用与集成能力。     

松嫩平原作物生产力地统计空间格局分析

应用地统计学方法和GIS分析方法研究松嫩平原作物现实生产力的空间分布格局及其影响因素。结果表明：玉米和大豆现实生产力空间变异的理论模型均为球状模型；对于玉米现实生产力而言，由随机性因素引起的空间异质性占总空间异质性的38．9％，且主要体现在5km以内的小尺度上；由空间自相关引起的空间异质性占总空间异质性的61．1％，主要体现在中尺度上。大豆现实生产力的块金值较大，占基台值的41．3％，表明对于大豆而言，人为控制因素的作用更显著；而且随机性因素引起的空间变异主要表现在10km以内；在10km以外。结构性因素是引起大豆现实生产力空间分布异质性的主导因素。玉米和大豆现实生产力的分维分析结果表明，结构性因素对玉米现实生产力的影响大于大豆，人为影响在其现实生产力的区域分异上起到了主要作用。图5，表3。参6。