一种数字阵列天气雷达信号处理系统设计

为了获得气象目标信息参数、为分析湍流等天气过程演变提供更精细的信息、为高质量气象分析提供更好的手段,结合研制的某X波段数字阵列天气雷达,对数字波束形成（DBF）技术、杂波抑制和频域解模糊等问题进行了分析和仿真;探讨了DBF技术在天气雷达中的应用优势,对因波束电扫描使波位变化导致回波信号跳跃而限制IIR滤波器和脉冲对处理（PPP）应用的问题,提出采用频域插补技术来实现地物杂波抑制和保证气象目标券数估计的盾量．最后．给出了天气雷达信号处理系统工程设计方案．     

手性樟脑磺酸的合成及表征

以樟脑粉为原料合成了消旋樟脑磺酸;采用l-苯甘氨酸为拆分剂,经拆分、纯化分离得到了手性樟脑磺酸。合成消旋樟脑磺酸的适宜工艺条件为：反应时间25 h,浓硫酸的滴加速度0.5～1.0 mL/min,反应温度10℃,消旋樟脑磺酸的收率85.6%,熔点195～201℃。拆分的适宜工艺条件为：物料比n（dl-樟脑磺酸）∶n（l-苯甘氨酸）=1∶0.95,d-樟脑磺酸拆分收率64%,熔点194～196℃,[α]2D0=＋23°（C=5,H2O）;l-樟脑磺酸拆分收率90.8%,熔点197～198℃,[α]2D0=-22.5°（C=5,H2O）。样品经熔点、旋光率、红外光谱等检测方法,证明与目标产物一致。     

基于CBERS-02B高分辨率遥感影像分割的最优尺度选取

高分辨遥感影像的信息提取对矿山的监测有着重要意义,影像分割是高分辨率遥感影像信息提取关键的一步．文中以赣州稀土矿山的高分辨率遥感影像为源数据,采用分形网络演化多尺度分割算法对高分辨率遥感影像进行分割,通过Robert算子的边缘提取结果计算分割参数获取分割尺度,并在此基础上设置不同分割尺度对影像进行分割,对比分析分割结果表明,沉淀池的最优分割尺度为35．最后利用分割质量值对分割结果进行评价分析,验证了试验结果的正确性．     

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.     

基于视频积累的距离扩展目标检测

正确提取目标强散射中心,并对强散射中心的能量进行有效的积累,是高分辨率雷达距离扩展目标检测的关键.本文先根据最大信噪比原则估计出目标窗口,然后在此窗口中利用门限检测方法提取目标强散射中心,最后利用广义似然比方法推导了自适应单扫频周期径向积检测器.仿真结果表明比文献[1]提出的SSD-GLRT检测器的性能有较大的改善.