Operator and matrix representation for the generalized inverse AT,S(2)A_{T,S}^{(2)}

This paper presents the matrix representation for extension of inverse of restriction of a linear operator to a subspace, on the basis of which we establish useful representations in operator and matrix form for the generalized inverse A_T,S⁽²⁾A_{T,S}^{(2)} and give some of their applications.     

强激光超高斯光束形成的自聚焦环的分裂与抑制

通过数值求解非线性近轴波方程,详细描述了在钕玻璃介质中传输的强激光圆对称超高斯光束形成的自聚焦环,并展示了初始光束受到扰动引起环分裂的现象。对于峰值光强一定的光束,合理地选择其阶数和宽度,可以降低自聚焦成环效应,从而降低因自聚焦环分裂在光束边缘出现的细光束对介质造成的成丝破坏。     

空间载频条纹相位分析法中的相位不确定性

分析了单频、双频空间载频光学条纹相位分析技术中的相位不确定性问题,提出采用两频率之比为无理数的双频载频条纹,相位可完全确定,并提出了基于两频率之比为无理数的空间载频条纹相位确定算法,给出了实验结果。     

一种新型冷头结构的微型同轴脉管制冷机的实验研究

许多现代电子器件的正常运行都需要一种紧凑型、高可靠性,低耗能的微型机械制冷机进行低温冷却。针对这种需求,文中提出了一种新型整体式冷头结构,该冷头结构大大增强了工作气体与冷头换热器的换热能力。详细描述了一种由7.0 cc扫气容积对置式双活塞线性压缩机驱动的具有这种新型冷头结构的微型同轴脉管制冷机的性能实验研究。     

Nanosecond time-resolved IR study of thiobenzoylnitrene

Nanosecond time-resolved infrared (TRIR) spectroscopy has been used to observe singlet thiobenzoylnitrene at 1740 cm(-1) upon photolysis of 5-phenyl-1,2,3,4-thiatriazole in acetonitrile and dichloromethane. Consistent with the experimental observations, thiobenzoylnitrene is predicted by B3LYP/6-31G* calculations to have a singlet ground state with an intense IR band at 1752 cm(-1). Phenyl isothiocyanate is also produced. Kinetic measurements indicate that it is not formed from singlet thiobenzoylnitrene, but rather directly from the thiatriazole. Unlike benzoylnitrene, singlet thiobenzoylnitrene does not react with acetonitrile or dichloromethane on the nanosecond timescale. However, it does react with dimethyl sulfoxide (DMSO) to produce a sulfoximine detected at 1180 cm(-1) (k(DMSO) = 3 × 10(5) M(-1) s(-1)). Benzonitrile (observed at 2230 cm(-1)) is produced from both singlet thiobenzoylnitrene (presumably through a short-lived, unobservable benzonitrile sulfide intermediate) and directly from the thiatriazole. B3LYP/6-31G* calculations also show that the structure of singlet thiobenzoylnitrene is analogous to that of related acylnitrenes, with a significant bonding interaction between the nitrogen and sulfur. Triplet thiobenzoylnitrene, on the other hand, is predicted computationally to have a biradical structure.     

倾斜管内低温两相弹状流特性实验研究——弹状汽泡运动速度

使用高速动态分析仪对低温倾斜上升管内不同位置处弹状汽泡进行了可视化实验研究。对获得的弹状汽泡的运动速度进行了统计分析,研究了弹状汽泡运动速度的变化规律。结果表明:对于两个不同管径的管路,当倾斜角θ(相对水平方向的夹角)为90,°80,°70°时,弹状汽泡上升速度随着长径比(x/D)的增大而增大,与传统的空气-水两相弹状汽泡沿着管路的运动速度的变化趋势不同;当倾斜角60°时,弹状汽泡上升速度随着x/D的增大先增大后减小;当倾斜角θ为45,°40°时,弹状汽泡上升速度随着x/D的增大而减小;所有工况下,随着倾斜角度的减小,弹状汽泡上升速度先增大后减小,在θ=60°处最大,且在管出口处,汽泡的上升速度几乎不变。该文为进一步研究低温液氮沸腾两相弹状流发展过程中弹状汽泡运动速度提供参考依据。     

Influence of annealing temperature on the performance of Ge film and photon-counting imaging system

<正>Compared with the traditional image intensifier with phosphor screen readout,the photon-counting imaging detector with charge induction readout is more beneficial in several aspects(e.g.,good imaging properties and time resolution) to astronomy,reconnaissance,bioluminescence,and materials research.However, the annealing temperature during the tube-making process can affect the properties of the Ge film,and consequently impair the performance of the detector.Therefore,the influence of annealing temperature on Ge film and on the detector is studied in order to determine the crucial parameters.The Ge films are prepared on ceramic and quartz glass by the use of an electron gun.They are analyzed by scanning electron microscope(SEM),high-resistance meter,and X-ray diffraction(XRD).The results show that the optimum substrate and annealing temperature are ceramic plate and 250℃,respectively.     

基于离子液体的绿色电子器件

基于离子液体的绿色液体电子器件可回收性强, 且具备柔性、 自修复性、 可重塑与可重构性等性能, 拓宽了液体电子器件的应用范围, 为绿色环保的多功能电子器件的开发提供了新途径. 本文围绕离子液体基的电子器件进行了总结, 并阐述了该类器件广阔的应用前景.     

Multiplicative Semigroup of a Residue Class Ring

In this paper, we consider the structure of the multiplicative semigroup of a residue class ring R/I of a commutative ring R with identity modulo its nonzero ideal I. For the general case, we investigate the H-classes, maximal subgroups and the structure of Reg(R/I) which is the set of regular elements of R/I. If R is any integral domain and if I is a product of powers of invertible maximal ideals, we show that R/I is an epigroup, every H^*-class of R/I is a nil-extension of a group (:unipotent epigroup) and that R/I is a complete lattice of unipotent epigroups.     

找约束方程组最佳解的递推算法

本文利用关于Ｍｏｏｒｅ－Ｐｅｎｒｏｓｅ逆的Ｇｒｅｖｉｌｌｅ算法及其有关参数的性质，导出了找约束方程组Ａｘ＝ｂ，ｘ∈Ｔ最佳解的两类递推算法，其中后者是与求解通常线性方程组的ＡＢＳ算法类似的。