Reversible Oxygen Binding to the Polymeric Cobalt Tetraazaporphyrin Complex and Oxygen‐Facilitated Transport through Its Membrane

Summary: A membrane of a cobalt tetraazaporphyrin polymer complex was prepared with a nanometer thickness and used as an oxygen‐facilitated transport membrane. Rapid and reversible oxygen binding to the cobalt tetraazaporphyrin complex with a polymeric imidazole ligand was observed at low temperature. Oxygen transport through the membrane was facilitated and a high (oxygen/nitrogen) permselectivity of 28 was obtained.

Oxygen‐facilitated transport through a cobalt tetraazaporphyrin complex‐polymer membrane of nanometer thickness.     

Modeling of Shape Memory Induction and Recovery in Heat‐Shrinkable Polymers

Summary: A mechanical model was developed to describe qualitatively and quantitatively the stress‐strain‐time behavior of a prepared shape memory crosslinked polyethylene during hot stretching, stress relaxation under 200% strain at high temperature and strain recovery of the heat shrinkable polymer. The stress‐strain, the stress relaxation and the irrecoverable strain behavior of the model were established by driving the constitutive equation, which could qualitatively represent the behavior of the real material. By choosing significant values for the parameters of the proposed model, an excellent fit was obtained between the experimental behavior of the polymer and that predicted by the model. It was also revealed that the main source responsible for the imperfect recovery of the induced strain observed was the stress relaxation occurring during the stretch holding‐cooling time step.

Stress relaxation of crosslinked polyethylene under 200% strain at 160 °C.     

PMOSFET's热载流子退化模拟及寿命评估的统一模型

对 PMOSFET's几种典型器件参数随应力时间的退化规律进行了深入研究 ,给出了一个新的器件退化监控量 ,并建立了不同器件参数退化的统一模型 .模拟结果和测量结果的比较表明 ,新的退化模型具有较高的准确性和较宽的适用范围 .新的退化模型不但可以用于器件参数退化量的模拟 ,也可以用于器件寿命评估     

恢复率正比于总人数的多传染阶段的艾滋病模型及其性态

文 [1 ]、[2 ]和 [3]主要是建立多传染阶段的艾滋病模型 ,并根据各自建立的模型 ,来讨论疾病传染的消除平衡态与流行平衡态以及它们的稳定性 .本文首先对文 [3]中的模型作适当的改进 ,再根据改进的数学模型来分析疾病传染的动态性质 ,着重讨论多传染阶段情况下艾滋病传染的持久性及其对总人数的影响 .     

Thermo-kinetic Investigation of Optimum Growth Temperature of Petroleum Bacteria

The power-time curves of the growth of three strains of petroleum bacteria at different temperatures have been determined. A novel equation of a power-time curve has been proposed in this paper. The general formula to calculate the rate constant of the bacterial growth has been derived. The rate constants of the bacterial growth at different temperatures, the heat production per newly formed bacterium, the bacterial number at the end of the bacterial growth and the deceleration rate constant of the bacterial growth at 50.00°C, have been calculated. The optimum growth temperatures of the three strains have been obtained.This revised version was published online in November 2005 with corrections to the Cover Date.     

三苯胺甲醛二苯腙的合成及其光电性能研究

合成了一种新型的三苯胺类载流子传输材料三苯胺甲苯二苯腙,通过一系列手段对该化合物性能进行了表征,并以此化合物为载流子空穴传输材料,Y-型酞菁氧钛为载流子产生材料制备了光导器件,测定了该光电器件的光电性能,显示出良好的光电性能(E_1/2=1.0lx.s),可以替代常用的载流子传输材料二乙基苯甲醛二苯腙.     

A Novel Gelatin-Based Sustained-Release Molluscicide for Control of the Invasive Agricultural Pest and Disease Vector Pomacea canaliculata

Pomacea canaliculata, one of the 100 most destructive invasive species in the world, and it is an important intermediate host of Angiostrongylus cantonensis. The molluscicides in current use are an effective method for controlling snails. However, most molluscicides have no slow-release effect and are toxic to nontarget organisms. Thus, these molluscicides cannot be used on a large scale to effectively act on snails. In this study, gelatin, a safe and nontoxic substance, was combined with sustained-release molluscicide and was found to reduce the toxicity of niclosamide to nontarget organisms. We assessed the effects of gelatin and molluscicide in controlling P. canaliculata snails and eggs. The results demonstrated that the niclosamide retention time with 1.0% and 1.5% gelatin sustained-release agents reached 20 days. Additionally, the mortality rate of P. canaliculata and their eggs increased as the concentration of the niclosamide sustained-release agents increased. The adult mortality rate of P. canaliculata reached 50% after the snails were exposed to gelatin with 0.1 mg/L niclosamide for 48 h. The hatching rate of P. canaliculata was only 28.5% of the normal group after the treatment was applied. The sustained-release molluscicide at this concentration was less toxic to zebrafish, which means that this molluscicide can increase the safety of niclosamide to control P. canaliculata in aquatic environments. In this study, we explored the safety of using niclosamide sustained-release agents with gelatin against P. canaliculata. The results suggest that gelatin is an ideal sustained-release agent that can provide a foundation for subsequent improvements in control of P. canaliculata.     

纳米-微米复合孔泡沫陶瓷固定化脂肪酶

考察了泡沫陶瓷的孔径分布和表面性质对脂肪酶固定化的影响.研究表明,泡沫陶瓷的纳米孔孔径分布非常适合脂肪酶的固定化,对固定化酶的催化效率有决定性的影响.经1h的定化,泡沫陶瓷固定化酶的活性达商业化硅藻土固定化酶的1.33倍,体积活力为其2.63倍,蛋白载量为45.36mg/g陶瓷,比活为1215.39U/g,活力回收为41.2%.泡沫陶瓷固定化脂肪酶在有机相乙酸乙酯合成中表现优良,连续使用5次,每次反应3h,乙酸转化率均在93%左右.     

多载频FMCW在MIMO雷达中的应用研究

 介绍多载频MIMO雷达的特点和工作原理,对多载频线性调频连续波(FMCW)信号及其回波进行了分析,并详细论述了MIMO雷达中静止目标和运动目标情况下多载频FMCW信号处理方法以及其中的一些关键问题,如通道分离滤波器的设计、距离分辨率分析、速度补偿精度分析、相参积累周期数的选取等.针对该体制雷达各发射天线间载频不同的特点,提出了采用IFFT相参合成的方法来精测目标距离,获得距离高分辨,具有运算速度快、受目标运动影响小的优点;对运动目标情况下距离多普勒的耦合问题进行了详细分析,并提出了利用相参积累进行补偿的解决方案.     

一种能区分水印或内容篡改的脆弱水印算法

针对目前脆弱水印算法大多无法区分水印被篡改还是内容被篡改的问题,本文基于多重水印技术提出了一种能区分水印或内容篡改的脆弱水印算法.该算法由子块的主要DCT系数生成恢复水印,将其嵌入到偏移子块的次低位;待恢复水印嵌入后,将恢复水印作为子块内容的一部分生成认证水印,将其嵌入到子块的最低位.理论分析和实验结果表明:本文算法在抵抗量化攻击的同时,不仅能准确定位图像内容被篡改的位置,而且能区分是水印被篡改还是图像内容被篡改,并且在一定条件下可以对内容被篡改的区域进行恢复.