强激光装置中玻璃疵病在线检测的光学系统设计

介绍了一种用于玻璃疵病在线检测的近摄工作距成像光学系统,其光组结构形式采用了光阑后置的准远心结构形式,主要光学参量为f′=14 mm;在物像距为250 mm约束条件下,物方视场达到90 mm(对角线);F/number=3.56;光谱适应范围为400～800 nm,对应的空间分辨率为100 lp/mm时,调制传递函数大于0.29.     

神光-Ⅲ 3ω光路自动准直系统设计

基于闭环反馈控制理论，对神光-Ⅲ 3ω光源自动准直系统进行设计，分析系统的工作原理、控制算法和软件控制流程。对准直过程中电动控制对于控制结果影响的变化规律建立了数学模型，旨在克服俯仰和方位相互联动对准直精度的影响。采用二维镜架自动准直方案，使准直偏差在预定调整范围内不断收敛。神光-Ⅲ调试现场的准直结果证明：该自动准直系统达到了设计要求，即自动准直系统在半小时内完成8路光束的光束准直，其角度误差≤5.0%/空间滤波器小孔直径,平移误差≤1.0%(光束近场直径精度)。     

稀土钕-丙烯酸-草酸配合物的合成、表征及荧光性能

合成了钕-草酸-丙烯酸三元固体配合物。利用元素分析、红外光谱(FT-IR)、紫外-可见光谱(UV-Vis)、热重分析(TGA)和荧光光谱等手段研究了配合物的结构和性质。结果表明配合物的组成为[Nd(OOC—COO)(CH2CH—COO)].3H2O,热分析结果表明该配合物具有较好的热稳定性。荧光光谱表明配合物都具有较好的荧光特性,且发射谱线很窄,主发射峰为钕离子的4G5/2 2G7/2-4I9/2跃迁,表明合成的新型稀土配合物可用作光致发光材料。     

分光光度法测定鱼翅中锗

本文用分光光度法测定鱼翅中的总锗量。结果表明 ,鱼翅中的总锗含量为 18.2 5— 2 2 .75 μg·g-1;回收率为 85 .8%— 93.2 %。     

MAGNETIC FIELD EFFECT OF THE EUROPIUM a8S7/2-z6P7/2 LINES

The magnetic field effect of a⁸S_7/2-z⁶P_7/2 lines of ¹⁵¹Eu and ¹⁵³Eu in magnetic fields up to 66.7 mT has been studied by using laser atomic beam spectroscopy. The Zeeman level structures of the europium a⁸S_7/2 and z⁶P_7/2 states in magnetic fields were discussed. The location and intensity of the measured Zeeman transition lines were found in good agreement with the theoretical results.     

Absolute monotonicity of rational functions occurring in the numerical solution of initial value problems

Summary This paper deals with rational functions ø(z) approximating the exponential function exp(z) related to numerical procedures for solving initial value problems. Motivated by positivity and contractivity requirements imposed on these numerical procedures we study the greatest nonnegative numberR, denoted byR(ø), such that ø is absolutely monotonic on (–R, 0]. An algorithm for the computation ofR(ø) is presented. Application of this algorithm yields the valueR(ø) for the well-known Padé approximations to exp(z). For some specific values ofm, n andp we determine the maximum ofR(ø) when ø varies over the class of all rational functions ø with degree of the numerator m, degree of the denominator n and ø(z)=exp(z)+(z ^p+1 ) (forz0).     

螺旋桨空化噪声连续谱仿真算法

螺旋桨空化噪声连续谱由大量空泡随机崩溃所辐射噪声叠加而成。据此,考虑到空泡初始崩溃时刻的随机性和各空泡辐射噪声频谱的相似性,对四种情况空化辐射噪声连续谱特性分别进行了理论分析表明,可依据空泡半径和初始崩溃时间的统计性质,采用蒙特卡罗方法对空化噪声连续谱波形进行仿真建模,模型参数为空泡半径期望值、差异度和随机度,分别相应于确定辐射噪声的基准波形、各空泡噪声频谱相似程度和大量空泡的随机崩溃过程。该方法输入参数物理意义明确,控制简单,能较好地仿真空化噪声连续谱的特性,仿真结果与理论分析吻合较好。     

CE‐SDS method development,validation, and best practice—An overview

CE‐SDS has been implemented in the biopharmaceutical industry and is being used for the characterization of therapeutic proteins in most Biological License Applications currently submitted. An overview is presented on the separation mechanism, methodology, and good working practices/best practices. The CE‐SDS platform method development and validation are discussed and typical scientifically and regulatory issues and troubleshooting situations are highlighted.