噻唑烷并手性恶唑硼烷催化剂结构和性质的量子化学研究

采用量子化学从头计算方法研究了噻唑烷并手性恶唑烷催化剂及其硼烷加合物的结构和性质，选用Hartree-Fock方法从6-31g基组下进行了全优化计算，并计算了催化剂其加合物的红外振动光谱，催化剂具有扭曲的椅式构型，与硼烷在N原子处配位形成加合物，反应是放热的，加合物的形成，一方面使得催化剂上B原子所带正电荷增加，有利于与酮羰基氧的配位反应进行；另一方面使得BH3中B-H键被削弱，有利于后续反应中H从BH-3到酮羰基碳的转移，从而增强了催化反应的活性。     

p区元素“惰对效应”的电位判据(Ⅰ)

对ｐ 区元素进行了普查，提出了用同一元素ｓ 轨道与ｐ 轨道标准还原电位的差值来量度“惰对效应”，当△Ｅ°ｓ－ ｐ ＞ ０－７ Ｖ 时，可作为＋ （ ｑ－ ２） 价元素具有“惰对效应”的判据。由强到弱的顺序为：Ｔｌ＋１（１－６０） 、Ｐｂ＋２（１－５８） 、Ｂｉ＋ ３（ ＞ １－４８） 、Ｐｏ＋ ４（０－８０） 。     

Global view of Hopf bifurcations of a van der Pol oscillator with delayed state feedback

This paper presents both analytical and numerical studies on the global view of Hopf bifurcations of a van der Pol oscillator with delayed state feedback. Based on a detailed analysis of the stability switches of the trivial equilibrium of the system, the stability charts are given in a parameter space consisting of the time delay and the feedback gains. The center manifold reduction and the normal form method are used to study Hopf bifurcations with respect to the time delay. To gain an insight into the pe...     

推广约维法的探讨

通过对群G选择的分析，提出了推广法的步骤，举例说明其如保使了获得质量，但仍然不能使超引力中标量场具有质量。     

Emergence as Non-Aggregativity and the Biases of Reductionisms

Most philosophical accounts of emergence are incompatible with reduction. Most scientists regard a system property as emergent relative to properties of its parts if it depends upon their mode of organization-a view consistent with reduction. Emergence is a failure of aggregativity, in which ``the whole is nothing more than the sum of its parts'. Aggregativity requires four conditions, giving powerful tools for analyzing modes of organization. Differently met for different decompositions of the system, and in different degrees, the structural conditions can provide evaluation criteria for choosing decompositions, ``natural kinds', and detecting functional localization fallacies, approximations, and various biases of vulgar reductionisms. This analysis of emergence and use of these conditions as heuristics is consistent with a broader reductionistic methodology.     

“经营期权”及其进一步探讨

“经营期权”是最近新出的评估某投资项目或整个公司的方法，其思想是将金融市场中的期权概念借用到企业财务管理之中，提出“经营期权”的概念，本文对经营期权做详细介绍并做了进一步讨论。     

筒式烘干机减速装置主要参数优化设计

根据物料烘干的实际情况，确定了减速装置的传动方式及传动比，利用优化方法对其中几个主要传动进行了优化设计。     

Using Acoustic Emissions to Detect Damage in Three-Dimensional Braided Composites

Three-dimensioual(3D)braided composites with better properties have been used in some particular industries.Some have had obvious signs of crack when they are braided.Others have had catastrophic failures occuring without warning.A new methodology for the analysis of failure modes in composite materials by means of acoustic emission techniques has been developed.The occurrence of fiber-breakage during tensile loading tests has been observed by the acoustic emission technology.Using acoustic emission technology is investigated as a means of monitoring 3D braided composites structures,detecting damage,and predicting impending damage.Stone of the findings of the research project were presented.     

高校实验室废液中Cr(VI)的测定及处理方法

Cr(VI)是对环境有害的主要重金属之一,实验室含Cr(VI)废液不能直接排放,必须进行回收处理。采用间接碘量法测定含Cr(VI)废液的浓度;化学还原法处理含Cr(VI)废液,研究以硫酸亚铁为还原剂还原Cr(VI)废液的酸度条件、还原剂用量、反应时间等影响因素。结果表明:在最佳条件下,以硫酸亚铁为还原剂处理,废液达到了国家排放标准,取得了良好的处理效果。     

The definition of effective emissivity of land surface at the scale of remote sensing pixels

Remote sensing (RS) of land surface temperature (LST) is a very challenging problem at the present development stage of RS science. Tremendous efforts have been devoted to atmosphere correction and temperature emissivity separation (TES) of new LST product algorithms. However, the mechanism of directionality of thermal emission from land surface remains unknown, and even worse, there are confusions on the definition of the effective emissivity of land surface at the scale of RS pixels. The mechanism of directionality of thermal emission for isothermal pixels and non-isothermal pixels is different. For non-isothermal pixels (case in most canopy/soil structures), the directionality of their thermal emission is determined by both bidirectional reflectance distribution function (BRDF) derived emissivity and distribution patterns of temperature differences. A new definition is suggested to take into account material mixture, multiple scattering, and temperature variation within thermal infrared (TIR) RS pixels.