[Mo6O17(NAr)2]2-的光谱与[Mo6O19]2-类芳香性的研究

本文研究分析了六钼酸盐的2,6–二甲基苯胺的邻、对位二取代衍生物的UV/Vis、¹H-NMR和UV-Vis-NIR反射光谱。比较二者的光谱特征得出六钼酸盐的对位二取代衍生物中存在更大的π共轭离域体系。结合量子化学π共轭离域体系的计算结果成功地解释了二者的光谱特征的差别，从而在实验上证实这类前过渡金属的同多酸阴离子[M₆O₁₉]^n-(M=Mo和 W, n=2; M=V和Nb, n=8）中存在类芳香性。     

热辐射波在介质内的散射机理

从偶极子辐射理论出发导出了热辐射在介质内散射强度的一般表达式,确定了影响热辐射散射强度的主要因素.研究表明:入射辐射频率、阻尼振子的振幅等对介质的反射率、吸收率、透射率等热辐射特性具有决定性的影响.     

加强模具专业的实践性教学,培养应用型人才

实践性教学是高校人才培养的重要组成部分.结合社会经济发展对模具专业人才的需求,分析了模具专业的特点和学生应具备的知识结构和能力,提出实践性教学的目标,以能力培养为主线,完善实践教学的体系.     

民用技术向军用转化评价准则与方法研究

提出从高新技术军民共用性质、转化发展潜力、转化效益、转化风险、转化的产业化前景等五个准则展开民用技术向军用的转化评价,进而形成评价准则体系.运用经过修正的层次分析法、模糊评价法等求出指标权重.通过模糊数排序的方法得到备选技术的综合评价值,达到对多个备选技术进行评价筛选的目的.通过将该方法在某民用技术向军用技术转化选择中的应用,得出技术的优劣排序,选择理想的转化技术.     

Petri网精细化操作及其在系统建模中的应用

为了解决“顾客投诉”等这一类业务处理问题,提出了用Petri网精细化操作解决问题的方案。用Petri网为系统建模。定义了两种子网,用这两种子网分别对Petri网中的的某些变迁或库所进行细化,得到更细致、更精确的Petri网。研究了Petri网精细化操作的性质保持问题,给出了这两种精细化操作保持状态机(SM)、标识图(MG)、自由选择网(FC)、非对称选择网(AC)、结构有界性、守恒性、可重复性、相容性和活性的充分条件。结果可为复杂大系统的分析提供重要手段,并特别适合于一类业务系统的描述和验证,具有一定的实用价值。     

基于时域滤波的点目标检测算法

当红外预警系统对低空飞行的运动目标进行检测时,由于云杂波的存在,系统的检测性能会受到严重影响。分析了云层背景下目标和云层在探测器上的时间响应特性,建立了四种类型的像素点时域模型。并以这四种时域模型为基础,提出了云层背景下点目标的时域检测算法。理论分析和实验结果表明,新算法能有效检测出各种云层背景下的点目标。     

一类不确定时滞系统的鲁棒H∞可靠控制

研究了一类包含状态时滞和参数不确定系统基于状态观测器的鲁棒H∞可靠控制问题.目的是设计状态观测器不仅使得执行器正常工作时系统渐近稳定,而且使得对于系统中预先指定的执行器子集内的执行器失效时,相应的闭环系统也渐近稳定.借助于议论广义的Riccati矩阵不等式,给出了控制器存在的条件,同时给出了所期望控制器的解析式.最后,通过一个仿真例子,说明该方法的可行性.     

液化气中硫醇结构组成研究

用化学分离结合GC／DFPD、GC-MS仪器分析方法对液化气中的硫醇结构组成进行了分析研究，建立了易于操作的液化气中硫醇分离流程及硫醇的定性．定量分析方法。结果表明，液化气中主要含有结构比较简单的硫醇，以甲硫醇和乙硫醇为主，这与液化气的组成特点相符合。     

Sequencing of phosphopeptides sulfonated by 4-sulfophenyl isothiocyanate using post-source decay matrix-assisted laser desorption/ionization time-of-flight mass spectrometry

Phosphorylation/dephosphorylation is probably the most common and important reversible post-translational modification of proteins. Analyzing the functional effects of phosphorylation is helpful for understanding the biological functions of proteins. Identification of the phosphorylation sites of phosphorylated protein is a prerequisite for research on phosphorylation. In this work, an effective and simple method of identification of protein phosphorylation sites has been developed. Phosphopeptides were selectively enriched with immobilized metal affinity chromatography (IMAC) and subsequently chemically modified by 4-sulfophenyl isothiocyanate, and then the chemically modified phosphopeptides were sequenced with post-source decay (PSD) matrix-assisted laser desorption/ionization (MALDI) time-of-flight mass spectrometry for detecting phosphorylation sites. The charge of derivatization by 4-sulfophenyl isothiocyanate introduces a negative sulfonic acid group at the N-terminus of a peptide, and enables the selective detection of only a single series of C-terminal y-type ions. This chemically assisted method greatly simplifies the extremely complex pattern of PSD fragment ions and makes the PSD spectra more easier to be interpreted. The phosphorylation sites of a synthesized model phosphopeptide and human c-myc protein have been successfully identified by this method.     

Gene flow from genetically modified herbicide-resistant rapeseed to cruciferous weeds

The sexual compatibility between genetically modified (GM) glyphosate-resistant rapeseed variety Q3 (Brassica napus L.) and 5 cruciferous weeds is studied through the observation of fluorescence microscopy and cross-fertility after manual pollination. The results indicated that Q3 (as male) was highly incompatible with Thlaspi arvense L., Capsella bursa?pastoris (L.) Medic, Cardamine hirsuta L. and Rorippa palustris (L.) Besser (as female). Fluorescence microscopic observation showed that growing of pollen tubes terminated on the stigma surface or at the upper 1/3 part of the style. However, B. juncea×Q3 was compatible, and the compatibility index was 1.65. Under the neighboring growth and natural pollination conditions, the rates of gene flow from Q3 to T. arvense, C. bursa-pastoris, C. hirsute and R. palustris were all 0, while it was 0.86% for B. juncea. These results indicate that there is difference in the rate of gene flow between GM rapeseed and cruciferous wild weeds, and frequency of gene flow is highly correlated with sexual compatibility.