The seminal literature of nanotechnology research

A generally weak area in research papers, reports, and reviews is the complete identification of seminal background documents that formed the building blocks for these papers. A method for systematically determining these seminal references is presented. Citation-assisted background (CAB) is based on the assumption that seminal documents tend to be highly cited. Application of CAB to the field of nanotechnology research is presented. While CAB is a highly systematic approach for identifying seminal references, it serves as a supplement and is not a substitute for the judgment of the authorsThe views in this paper are solely those of the authors, and do not represent the views of the Department of the Navy or any of its components, or the Institute for Defense Analyses     

基于社会敏感问题的问卷调查方案设计与分析

利用概率论与数理统计方法,以对酒后驾车现象为例,就社会敏感问题的问卷调查方案设计,建立数学模型,并对模型结果进行分析.     

解决一类群决策问题的改进德尔菲法

专家综合评价属于委员会形式的群决策问题,提出了基于一致性分析的群决策机制和基于OWA算子的群决策机制,用来弥补常用机制的缺陷;介绍了判断群体意见分歧特征和定量判断标准;提出了基于一致性分析的改进德尔菲法,介绍了这种方法的思想、特点和应用步骤;分析了这类群决策的人员组成和工作程序图.     

Survey of Chalcogenide Superconductors

The thread that runs through all research in the field of superconductivity is new physics through discovery of new materials. The knowledge of superconducting materials has become voluminous and complex. The comprehensive review of the superconducting materials is of particular importance. The main purpose of this report is to present the results of classification for chalcogenide superconductors. Superconducting critical temperature T_c, crystal-structure type and the references proper to these compounds are summarized. Brief survey of the superconductivity in chalcogen elements is also given. Furthermore, as representative sulfide and selenide, superconducting characteristics of CuRh₂S₄ and CuRh₂Se₄ will be shown.This revised version was published online in November 2005 with corrections to the Cover Date.     

Study on the Methyl Migration of 10-Methoxy-5,10-dihydrophenophosphazine 10-oxide

The title compound (1) was treated with NaH at room temperature in anhydrous DMF to give a sodium salt (containing nitrogen anion)which could shift the methyl group from oxygen to nitrogen atom to form N-methyl phosphinic acid as the reaction temperature was increased to 120 ℃.Three nitro derivatives containing 5,10-dihydrophenophosphazine ring system were prepared for the investigation on the above reaction mechanism which would be possible regarded as a special inter-molecular substitution.viz.,the nucleophilic nitrogen anion from one molecule of 1 attacked the cabon atom of the O-methyl of another 1.In addition,the chemical structures of seven compounds containing 5,10-dihydrophenophosphazine ring system involved in the experiment were confirmed by IR,^1 H NMR,^31P NMR and mass spectroscopy.     

直线感应加速器机械轴精密对中方法

 介绍了大型直线感应加速器机械轴精密对中安装方法和工艺。直线感应加速器由多个组元连接而成，总长几十m。采用激光跟踪仪并配以全站仪、水准仪进行准直测量，再用专门设计的高精度调节机构调节，可使机械轴的准直达到较高的精度。分析了准直安装各步骤能达到的精度，研究了几十m长机械轴准直控制测量网的建立和理论坐标值的修正。     

地面地震CT在浅层勘探中的应用

在地表面沿研究区域的四周布置激发点和检波器 ,进行人工地震观测记录。地震能量由激发点到达接收点 ,利用直达波、反射波和折射波等多震相 ,进行 CT反演 ,得到波速地震 CT图像。该图像给出浅层波速横向分布 ,反映了覆盖层分区及基底岩性特点与构造分布。该方法应用于某工程场地的浅层勘探中 ,所得波速 CT图像与地质露头及开挖相吻合。该方法将地震 CT技术从钻孔和巷道中解放出来。     

Degeneracy graphs: theory and application an updated survey

A survey of various aspects of the theory and application of degeneracy graphs (DGs for short) is given. The notion and some basic properties of DGs are introduced, cycling of the simplex method is discussed, the neighborhood problem is tackled, and the application of the so-called optimum DGs to particular problems which are connected with optimal degenerate solutions of a linear programming problem is presented. The impact of weakly redundant constraints on various postoptimal analyses under degeneracy is briefly described.     

International Perspective on Government Nanotechnology Funding in 2005

The worldwide investment in nanotechnology research and development (R&D) reported by national government organizations and EC has increased approximately 9-fold in the last 8 years – from $432 million in 1997 to about $4,100 million in 2005. The proportion of national government investments for: academic R&D and education are between 20% (Korea, Taiwan) and 65% (US), industrial R&D – between 5% (US) and 60% (Korea, Taiwan), and core facilities and government laboratories – about 20–25% in all major contributing economies. This evaluation uses the NNI definition of nanotechnology (that excludes MEMS or microelectronics), and is based on direct information and analysis with managers of nanotechnology R&D programs in the respective countries.     

On the Geometry of the Saccharinato Ligand/Ion in the Metal Saccharinates: Crystallographic Survey and Theoretical Study

The structural data for the five-membered ring of unsubstituted saccharinato ligands/ions in saccharinates are retrieved from the Cambridge Structural Database and analyzed. The average geometries of saccharin and the corresponding deprotonated species in the solid state are obtained and the extreme cases of highly distorted structures are pointed out. The influence of the nature of the metal ion as well as of the type of the metal-to-saccharinato bonding on the saccharinato geometry is examined. On going from saccharin or covalent saccharinates to ionic ones the bonds adjacent to the nitranionic center are shortened, while the carbonyl and sulfonyl groups are simultaneously stretched. The value of the internal angle at the nitrogen atom is lowered and that at the sulfur atom is increased, causing bending of the angle between the sulfonyl oxygen atoms. The average geometries are reproduced well by several (semiempirical and ab initio) theoretical models.