A Novel Method for the Selective Determination of Silver （I） Ion

Semiconductor quantum dots (QDs) present considerable advantages over bulk single-crystal semiconductors1. As a result of quantum confinement, they have unique optical and electronic properties such as broad excitation spectra, narrow, symmetric and tunable emission spectra2. In addition, QDs exhibit high photobleaching threshold and excellent photostability. They are starting to attract considerable attention as novel fluorescence probes in recent years3-6. Recently, Chen and Rosenzwei…     

分子伴侣GroE系统相互作用中结构与功能关系研究

根据大肠杆菌分子伴侣GroE系统的晶体结构数据，分析了GroEL顶端区域在其靶蛋白和GroES结合前后结构与功能的关系，讨论了GroEL的结构转变对其中心通道可及性和疏水特性的影响．提出了一种用以分析蛋白质之间相互作用趋势的方法，并用该方法分析了GroEL和GroES相互作用的3个氨基酸，得到了很好的结果。在此基础上，进一步用SwissPDBViewer对GroEL的核酸结合口袋进行了分析，结果表明活性中心与ADP磷酸键结合的残基Thr30可能与能量的传递有关．     

数字光开关网络中四功能交换开关光学Omega网络

本文提出了一种用于数字光开关网络中，四功能交换开关光学Ｏｍｅｇａ网络。文中详细地阐述了用液晶空间光调制方法实现光学四功能交换开关，和Ｏｍｅｇａ互连网络的原理，并给出了光学系统和实验结果。     

Population Growth of Small Harmful Rats in Grassland Subjected to Noise

The population growth of small harmful rats in grassland subjected to environment fluctuation has been modelled in a logistic equation. Two correlated random variables responsible to the fluctuation of the genetic factor and the suppression factor are used. A two-peak structure of the steady probability distribution of rate population is observed in the large fluctuation regime of the genetic factor. With the increase of correlation constant A, the steady probability distribution can change from two peaks to a single peak. The suppression factor μ and its fluctuation also affect the steady probability distribution and can push it toward a small population.     

The attenuation of oscillatory thermocapillary convection in the oxide melt by a transverse magnetic field

The effect of a transverse magnetic field on the oscillatory thermocapillary convection in the NaBi(WO4)2 melt was studied by using the in-situ observation system. The oscillation was attenuated when the 60 mT magnetic field was applied, as shown by the decrease in the amplitude and the frequency. Furthermore, the oscillation under smaller temperature difference was stabilized after the magnetic field was applied. The magnetic effect could be due to the Lorentz force generated by the interaction between motional ions and the vertical magnetic field. The ionic conductivities were measured to demonstrate the effect of the magnetic field. The solid ionic electrical conductivity increases with the temperature rise, and the melt ionic electrical conductivity was measured to be about 2.0×10-4 Ω-1·cm-1. Experimental results manifest that the effect of the magnetic field on anions and cations in the melt makes the flow change to the direction normal to the applied field, so the flow is more orderly and the oscillation is suppressed.     

基于OBE理念的“化工设备机械基础”课程改革研究*

针对“化工设备机械基础”课程传统教学模式中存在的问题,基于OBE教育理念,提出该课程的综合改革方案。结合化工类专业特点,从教学内容、授课形式和考核方式等3个方面对该课程进行了系列改革尝试。实践表明,方案的实施对于提高学生的理论知识水平、工程设计能力以及专业素养有很大帮助,同时为全面提升课程教学质量奠定了基础。     

高速车削300M超高强度钢时的Al2O3 基陶瓷刀具磨损机理研究

使用Al2O3基陶瓷刀具对300M超高强度钢进行了干切削试验,采用电子扫描显微镜（SEM）观察刀具的磨损形貌,并通过能谱分析仪（EDS）测量了陶瓷刀具磨损微区的各元素含量,分析了陶瓷刀具的主要磨损机理.结果表明：陶瓷刀具磨损的主要机理为粘结磨损、磨粒磨损和氧化磨损.粘结磨损主要发生在前刀面上,且受刀具材料和工件材料接触点应力状态的影响.刀具前、后刀面的磨损边缘区易发生氧化磨损.     

肽类树状大分子磁共振成像探针的合成与功能化

通过优化设计,合成了高产率的DTPA和DOTA配体.通过液相发散法制得第三代肽类树状大分子,其外围氨基分别用两种不同保护基团保护,且两种保护基团的个数比精确控制为18∶6,通过选择性脱去保护基团,其中一种氨基与DTPA、DOTA偶联,或与丁二酸酐反应,并与金属离子钆螯合,制得G3-18Gd-DTPA-6COOH,G3-...     

氮气稀释下丙烷层流扩散火焰的抬升特性研究

本文实验研究了氮气稀释条件下,丙烷层流扩散火焰的抬升特性。主要研究了混合物组分及射流出口速度对丙烷抬升火焰抬升高度的影响,得到了氮气稀释下丙烷抬升火焰的再附着滞后现象,并采用计算方法得出了理论火焰抬升高度,与实验数据进行了对比分析,二者符合很好。     

Y2Ba1Cu1O5-δ掺杂对Y1Ba2Cu3O7-δ的超导电性及其晶格结构的影响

本文采用固相反应法成功制备出一系列Y123与Y211的摩尔比为1：x（x=0、0．14、0．27、0．3、0．35、0．4、0．45、0．47、0．5、0．8、1．18）的样品．实验结果表明：在0．35≤x≤0．5范围内,Y123的起始转变温度Tonset临界转变温度Tc以及转变宽度△Tc都在x=0．47出现了拐点,这...