Photocatalysts of Cr Doped TiO2 Film Prepared by Micro Arc Oxidation

A series of Cr doped TiO2 films were prepared by micro arc oxidation (MAO) using an electrolyte of Na3PO4+K2Cr2O7. X-ray diffraction and scanning electron microscopy revealed that the films mainly consisted of anatase phase with a porous surface morphology. The films have an excellent photocatalytic effect for degradation of methylene blue and decomposition of water under visible light illumination. This arises from the formation of Cr3+/Cr4+ and oxygen vacancy energy levels owing to Cr doping. The former reduces the electron-hole recombination chance, while the latter generates a new gap between the conduction band (CB) and valence band (VB) of TiO2, which lowers the photo energy of the excited electron in the VB to the oxygen vacancy states. The mechanisms for film synthesis during the MAO process are also presented.     

核内核子与△粒子的散射截面

在自洽的相对论ＢＵＵ方程框架内研究了核内Ｎ（核子）△弹性和非弹性散射截面的介质效应，结果表明，在ＳＩＳ能区有效截面与Ｃｕｇｎｏｎ参数化相差很大而必须加以考虑．     

Electrochemistry and electroanalytical applications of carbon nanotubes: a review.

This review addresses recent developments in electrochemistry and electroanalytical chemistry of carbon nanotubes (CNTs). CNTs have been proved to possess unique electronic, chemical and structural features that make them very attractive for electrochemical studies and electrochemical applications. For example, the structural and electronic properties of the CNTs endow them with distinct electrocatalytic activities and capabilities for facilitating direct electrochemistry of proteins and enzymes from other kinds of carbon materials. These striking electrochemical properties of the CNTs pave the way to CNT-based bioelectrochemistry and to bioelectronic nanodevices, such as electrochemical sensors and biosensors. The electrochemistry and bioelectrochemistry of the CNTs are summarized and discussed, along with some common methods for CNT electrode preparation and some recent advances in the rational functionalization of the CNTs for electroanalytical applications.     

城镇生态系统的因子分析

本文从自然、经济、社会和环境四方面构建了城镇生态系统的指标体系 ,提出了评价生态化程度的因子分析方法 ,并对张家港市城镇生态化程度进行了分析     

城市主干道交通信号灯模糊线控制的探讨

本文首先提出城市交通系统线控制的两级递阶结构：第一级，用模糊逻辑控制器确定单路口交通信号灯的周期和绿信比；第二级，用模糊相位控制器确定相邻两路口的相位差；两级间用模糊转换开关协调；然后，提出具体的实现方法。     

Isoentropic and Isoenthalpic Temperatures of Protein Unfolding in Hydrophobic Interaction Chromatography

Hydrophobic interaction chromatography (HIC) is widely used for the separation and purification of biopolymers in their native state, and now also becomes a new method to refold the denatured proteins1. The effect of salt or water concentration2 on the pr…     

Upper bound on the occupation time in the simple exclusion process

We consider the occupation time variance in the asymmetric exclusion process. In the case where the mean m ≠ 0 (m is the mean hopping rate) and ρ = 1/2 (ρ is the filling probability for a state), we find that the variance is bounded above by O(t ^3/2 ). __________ Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 156, No. 1, pp. 147–158, July, 2008.     

关于“Programming with Semilocally Convex Function”(英文)

“ＰｒｏｇｒａｍｍｉｎｇｗｉｔｈＳｅｍｉｌｏｃａｌｙＣｏｎｖｅｘＦｕｎｃｔｉｏｎ”［１］一文对定义在局部星形集上的局部凸函数给出了二择一定理，并应用到约束最小化问题，得到了优化条件和共轭定理，本文用具体反例说明这些结果是错误的．     

On the isoperimetric deficit of a simplex and of a polygon

This paper gives inequalities which estimate the isoperimetric deficit of a simplex and of a polygon and some consequences thereof.     

Digital phase shift holographic interferometry and its application in the experimental flow study

The application of digital phase shift holographic interferometry to flow-visualization and flow temperature measurement of a 2D thermal flow field was experimentally investigated. An improved recording system for two reference beam phase shift holographic interferometry is set up for this experiment, and details of this experimental technique are described. The phase distribution obtained by this technique presents an excellent picture of flow visualization. From this phase image, temperature distribution of the 2D thermal flow field is also calculated and compared with some measured values obtained using thermocouple probes.