化学-酶法动态动力学拆分外消旋仲醇研究进展

介绍了外消旋仲醇动态动力学拆分的反应原理及金属配合物、酸性沸石催化仲醇消旋化反应的机理,论述了近年来过渡金属配合物催化剂、酸性催化剂与固定化脂肪酶结合,进行仲醇动态动力学拆分反应的研究进展。     

有限责任公司股东会决议效力分析——以对外担保为视角

股东大会是公司的最高权力机构,依法作出的股东会决议具有法律效力,但股东会作出的决议应当做到程序合法、内容合法并符合公司章程规定,否则就可能会影响股东会决议的效力。对外担保是公司一项重要的非常规经营,应由股东会行使担保的决策权,但若股东会决议存在瑕疵则会影响股东权益、债权人利益以及社会经济的稳定。本文拟以对外担保的股东会决议瑕疵为切入点,探讨公司股东会决议的效力问题。     

基于相关度的同步协同设计冲突消解策略

为解决同步协同设计技术所面临的设计资源冲突,提出了一种基于相关度的标准满意度冲突消解策略.在分析设计决策冲突产生原因的基础上,以学科领域相关度为依据,针对同步协同过程中的设计权限,应用标准满意度的评价方法,建立了冲突消解策略模型,来提高协同设计的效率和实时性.在多学科领域协同设计过程中得到了应用,并分析了该冲突消解策略的优越性.     

对预警探测雷达模拟器目标分辨率模型的校验方法的研究

预警探测雷达模拟器目标分辨率设置会影响目标数量的探测,分辨率错误会产生与实体雷达不一致的虚警和漏警,影响预警探测雷达模拟器的逼真度。本文首先从理论上分析了对目标分辨率模型进行校核应该注意的几个方面,然后研究了用来测试验证目标分辨率模型的空情想定的设计方法,通过对预警探测雷达模拟器目标分辨率模型进行校验,可以有效提高模型的仿真效果。     

The recombination of quasiparticles in x-ray superconducting tunnel detectors

The energy resolution of superconducting tunnel detectors is investigated from the point of view of the effect of recombination and boundary losses of nonequilibrium quasiparticles. Using the x-ray fluorescence method, the dependence of the signal on the energy of x-ray quanta is measured for Ti/Nb/Al/AlO_x/Al/Nb/NbN detectors. The form of the apparatus line is also investigated. The experimental data are analyzed using the diffusion model of tunnel detectors. __________ Translated from Izmeritel’naya Tekhnika, No. 8, pp. 59–64, August, 2006.     

Quantitative characterization of nanoprecipitates in irradiated low-alloy steels: advances in the application of FEG-STEM quantitative microanalysis to real materials

The characterization of the solute-enriched features (clusters or nanoprecipitates in irradiated low-alloy steels) requires extremely high spatial and elemental resolution, previously necessitating analysis using atom probe field-ion microscopy. In this investigation, field-emission gun-scanning transmission electron microscope (FEG-STEM) quantitative energy dispersive X-ray (EDX) microanalysis (spectrum imaging) has been applied to the characterization of the irradiation-induced nanoprecipitates in a low-alloy forging steel. Refinements in the EDX data have been possible via the application of multivariate statistical analysis (MSA) to the spectrum images, resulting in significantly reduced noise in the images. Most importantly, MSA permitted the clear identification of other elements in these Ni-enriched nanoprecipitates—including Mn and Cu. The processed X-ray spectrum images also provided direct evidence of the preferential formation of these irradiation-induced features along pre-existing dislocations within the steel, as well as the formation of intragranular nanoprecipitates. This research has provided the first direct X-ray spectrum images of irradiation-induced nanoprecipitates in high Ni A508 Gr4N forging steel, and has demonstrated the significant improvements attainable though the application of MSA techniques to the spectrum images. These results independently confirmed the analyses of the Ni-enriched nanoprecipitates previously conducted by 3D-APFIM, with the performance of the FEG-STEM/EDX technique shown to be comparable to that of the 3D-APFIM technique.     

光分组交换中的波长变换器配置研究

首先对波长变换器的功能及分类进行详细的论述,然后,对波长变换器的配置进行分析,总结出两种波长变换器配置方法,即独占式配置方法和共享式配置方法.针对独占式配置方法,本文使用仿真实验的方法研究了在不同类型的波长变换器下交换节点丢包性能的差异.本文还对独占式配置方法和共享式配置方法进行对比研究.     

充气飞行时间探测方法分析

本工作涉及充气飞行时间探测器的工作原理和实验测量结果。在不同能量(64、48和33MeV)下，利用充气飞行时间探测方法对同量异位素³⁶S和³⁶Cl进行鉴别，并与用传统的ΔE－E方法在相同能量下的鉴别结果进行比较。实验结果表明，在入射能量较高（E_i＞40MeV）时，ΔE－E法的鉴别能力比充气飞行时间法的稍好些；在E_i＜40MeV时，充气飞行时间法的鉴别能力比ΔE－E法的好，入射能量为20～40MeV时，充气飞行时间法能明显将³⁶S和³⁶Cl区分出来。     

一种提高CCD空间分辨力的方法研究

基于多次移位成像的原理,提出了一种提高红外电荷耦合器件(CCD)空间分辨力的方法.在不改变CCD像元尺寸的前提下,使各相邻像元对应的地面目标进行局部多次采样,提高采样频率,达到将CCD空间分辨力提高多倍的目的.仿真试验显示了其良好的性能.     

高速运动目标测试数据处理精度的方法研究

在利用微波干涉进行高速运动目标参数测试过程中,噪声是影响测试数据处理精度的关键因素,文章通过分析微波干涉信号的基本特点,利用小波变换与精确时域处理相结合的方法,对运动目标干涉信号进行了处理,得到了平滑的测试曲线,提高了数据处理结果的精度.同时该方法也可用于其他高噪变频数据的频率提取,具有通用性.