微光夜视系统新的阈值探测理论和视距探测方程研究

在对各种阈值探测理论和视距探测方程进行深入研究分析的基础上，从人眼阈值特性和微光视觉理论出发，建立微光夜视系统新的阈值探测理论模型，导出微光夜视系统新的视距综合探测方程。     

Eremophilane Sesquiterpenes from Cacalia Roborowskii

Themajorityofphytochemicalstudiesonsenencioneace(compositae)specieshavebeenconcentratedonthepyrrolizidinealkaloidsandsesquiteIPenesbecauseoftheirpotentialbioactivitiesandCytotoalcactivities.lCacaliaroborowskii(maxim)LinginslongbeenusedasfolkremedyinnorthwestemChina.Recently,wehadisolatedseveralneweremophilenolides'fromtherootsofthisplant.Asacontinuahonofourinvestigationontillsspecies,wenowpresenttileisolationandsmicturalelucid.ltionoffouraddihonalneweremophilanesesquiterpenes.Theirsmicturesw…     

一类稀疏效应下捕食—被捕食系统的全局分析

本文讨论了稀疏效应下的一类捕食-被捕食系统得到了极限环不存在条件,极限环的存在性与唯一性定理和异宿轨道存在与唯一性定理。     

相依线性回归系统的泛岭改进估计

对于一类相依线性回归系统，本文提出了一种泛岭改进估计，并讨论了这种估计及相应的两步估计的优良性质，获得了若干深入的结果．     

窄禁带稀磁半导体二维电子气的拍频振荡

通过对调制掺杂的n型Hg_0.82Cd_0.16Mn_0.02Te/Hg_0.3Cd_0.7Te第一类量子阱中磁性二维电子气磁阻拍频振荡的研究，发现温度、栅压的变化都会引起磁阻拍频节点位置的变化.从对拍频的分析中，可以将依赖于栅压的Rashba自旋-轨道分裂和依赖于温度的巨大塞曼分裂区分开来. 关键词： 磁性二维电子气 自旋分裂 sp-d交换相互作用 拍频     

Pontriagin空间上算子的交换性

证明了:当Pontrjagin空间上的正规算子A没有零性不变子空间时,Putnam- Fuglede定理成立;当正规算子A有零性不变子空问时,通过构造反例说明此时Putnam- Fuglede定理不成立,并对Π1空间上算子相关的交换性条件进行了讨论,得到了Π1空间上算子代数的二次交换定理．     

ON A PROJECTION THEOREM OF QUASIVARIETIES IN ELIMINATION THEORY

It is proyed that the quasi-varieties in affine space is closed under the projection operation though it is not so for algebraic varieties.     

光度法测定镉-碘化钾-甲基紫三元配合物中痕量镉

本文提出了 Cd( ) - KI-甲基紫三元配合物体系光度法测定 Cd( )的新方法。该方法灵敏度高 ,ε=5 .2 5× 10 5L·mol- 1·cm- 1 ,选择性好 ,精密度可靠 ,用于水中痕量镉的测定 ,结果令人满意。     

一种基于光电极值法的光学膜厚监控系统的改进设计

介绍目前通用的基于光电极值法的光学膜厚监控系统的特点，针对其缺点进行改进设计，新系统的稳定性有较大提高，可满足镀制多层介质薄膜器件的要求。     

Impact properties,phase structure,compatibility, and fracture morphology of polyamide‐1010/thermoplastic poly(ester urethane) elastomer blends

Blends of polyamide‐1010 (PA1010) and a thermoplastic poly(ester urethane) elastomer (TPU) were prepared by melt extrusion. The impact properties, phase structure, compatibility, and fracture morphology under impact were investigated for PA1010/TPU blends. The results indicated that TPU enhanced the impact strength of PA1010, and the best impact modification effect of the blends was obtained with 20 wt % TPU. The phase structure was investigated with scanning electron microscopy, and the compatibility was investigated with dynamic mechanical analysis and small‐angle X‐ray scattering. The study of the fracture morphology of PA1010/TPU blends indicated that the fracture surface of the blends had special features, consisting of many fibrillar elastomer particles and a conglutination–multilayer structure, as well as many small tubers on this structure. These fracture phenomena could not be found on the fracture surface of pure PA1010. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 1177–1185, 2005