同步扫描—固体基质室温磷光法同时测定痕量对位三联苯和间位…

本文提出了一种新的测定间三联苯和对三联苯的同步扫描－ＳＳ－ＲＴＰ法。固体基质选用慢速定量滤纸，重原子盐为ＴＬ２ＳＯ４。以激发单色器和发射单色器的波长差Δλ＝１８０ｎｍ进行同步扫描，其同步特征峰间三联苯为４５０ｎｍ，对三联苯为４９０ｎｍ（均指发射波长）。间三联苯可直接由该特征峰的高度进行定量测定。对三联苯在４９０ｎｍ处的特征峰略受间三苯同步拖尾的影响，其峰值信号需加校正，间三联苯和对三联苯的线性范围     

同步扫描－固体基质室温磷光法同时测定痕量对位三联苯和间位三联苯的研究

本文提出了一种新的测定间三联苯和对三联苯的同步扫描－ＳＳ－ＲＴＰ法。固体基质选用慢速定量滤纸，重原子盐为Ｔｌ２ＳＯ４。以激发单色器和发射单色器的波长差△λ＝１８０ｎｍ进行同步扫描，其同步特征峰间三联苯为４５０ｎｍ，对三联苯为４９０ｎｍ（均指发射波长）。间三联苯可直接由该特征峰的高度进行定量测定。对三联苯在４９０ｎｍ处的特征峰略受间三联苯同步拖尾的影响，其峰值信号需加校正。间三联苯和对三联苯的线性范围分别为０．４６～９２ｎｇ／斑点和０．４６～４６ｎｇ／斑点     

Inverstigation of Self-Starting for Self-Mode-Locked Ti:Sapphire Laser

ＩｎｖｅｒｓｔｉｇａｔｉｏｎｏｆＳｅｌｆ－ＳｔａｒｔｉｎｇｆｏｒＳｅｌｆ－Ｍｏｄｅ－ＬｏｃｋｅｄＴｉ：ＳａｐｐｈｉｒｅＬａｓｅｒＩｎｖｅｒｓｔｉｇａｔｉｏｎｏｆＳｅｌｆ－ＳｔａｒｔｉｎｇｆｏｒＳｅｌｆ－Ｍｏｄｅ－ＬｏｃｋｅｄＴｉ：ＳａｐｐｈｉｒｅＬａ...     

水杨酸分子NIR－FT－SERS与VIS－SERS的比较研究

水杨酸分子ＮＩＲ－ＦＴ－ＳＥＲＳ与ＶＩＳ－ＳＥＲＳ的比较研究方炎，汪媛，胡凤霞（首都师范大学实验中心，首都师范大学综合所北京１０００３７）ＴｈｅＣｏｍｐａｒｉｓｏｎｏｆＶＩＳ－ＳＥＲＳｔｏＮＩＲ－ＦＴ－ＳＥＲＳｏｆＭｏｌｅｃｕｌｅｓＡｄｓｏｒｂｅｄｏ...     

环糊精—表面活性剂包结作用的研究

应用表面张力方法研究了β－环糊精（β－ＣＤ）对十二烷基苯磺酸钠（ＳＤＢＳ）的包结作用，研究了不同温度下β－ＣＤ对ＳＤＢＳ表面活性的影响以及脂肪醇加入β－ＣＤ包结ＳＤＢＳ表面活性的影响，求得了不同温度下β－ＣＤ包结ＳＤＢＳ的平衡常数Ｋ，并用＾１ＨＮＭＲ波谱探讨了包结物β－ＣＤ／ＳＤＢＳ的分子结构模型。     

High Power All-Solid-State Nd: YVO_4 laser and its intracavity SHG

Ｈｉｇｈ　Ｐｏｗｅｒ　Ａｌｌ－Ｓｏｌｉｄ－Ｓｔａｔｅ　Ｎｄ：ＹＶＯ＿４　ｌａｓｅｒ　ａｎｄ　ｉｔｓ　ｉｎｔｒａｃａｖｉｔｙ　ＳＨＧＨｉｇｈＰｏｗｅｒＡｌｌ－Ｓｏｌｉｄ－ＳｔａｔｅＮｄ：ＹＶＯ＿４ｌａｓｅｒａｎｄｉｔｓｉｎｔｒａｃａｖｉｔｙＳＨＧ￥ＺＨ...     

褪色光度法测定微量硫化物的研究

根据Ｓ＾２－对４－（对磺酸基苯基）－卟啉（ＴＳＰＰ）与铅显色反应的褪色干扰作用，建立了一种测定Ｓ＾２－的新方法，该方法对Ｓ＾２－的检出限为１０μｇ／Ｌ，选择性较好，用于含硫废水中痕量Ｓ＾２－的测定，结果令人满意。     

一种制备银－氧化铝覆盖的滤纸基片的新方法

一种制备银－氧化铝覆盖的滤纸基片的新方法左晨，周群，王焕茹，郁鉴源（清华大学化学系北京１０００８４）ＡＭｅｔｈｏｄｆｏｒＰｒｅｐａｒｉｎｇＳｕｒｆａｃｅ－ＥｎｈａｎｃｅｄＲａｍａｎＳｃａｔｔｅｒｉｎｇＳｉｌｖｅｒ－Ａｌｕｍｉｎａ－ｐａｐｅｒＳｕｂｓｔ...     

非晶态半导体／金属薄膜的分形晶化

本文综述非晶态半导体／金属薄膜退火过程中金属诱导非晶态半导体晶化的研究，综述对若干非晶态半导体与金属组成的薄膜（Ｇｅ－Ａｕ、Ｇｅ－Ａｇ、Ｇｅ－Ａｌ、Ｇｅ－Ｓｅ、Ｇｅ－ｐｄ、Ｓｉ－Ａｇ、Ｓｉ－Ａｌ、Ｓｉ－ｐｄ、Ｓｉ－Ｃｕ、ｓｉｃ－Ａｌ、Ｓｉ＿３Ｎ＿４－Ａ１）晶化后形成的图形进行的分形研究，内容包括分形形成的实验规律、根据微结构电镜观测结果提出的随机逐次成核模型、以及对分形晶化进行的计算机模拟。     

非晶态半导体／金属薄膜的分形晶化

本文综述非晶态半导体／金属薄膜退火过程中金属诱导非晶态半导体晶化的研究,综述对若干非晶态半导体与金属组成的薄膜（Ｇｅ－Ａｕ、Ｇｅ－Ａｇ、Ｇｅ－Ａｌ、Ｇｅ－Ｓｅ、Ｇｅ－ｐｄ、Ｓｉ－Ａｇ、Ｓｉ－Ａｌ、Ｓｉ－ｐｄ、Ｓｉ－Ｃｕ、ｓｉｃ－Ａｌ、Ｓｉ＿３Ｎ＿４－Ａ１）晶化后形成的图形进行的分形研究,内容包括分形形成的实验规律、根据微结构电镜观测结果提出的随机逐次成核模型、以及对分形晶化进行的计算机模拟。     

基于云测试的自动测试系统体系架构研究

为了解决面临保障任务时,我军现有保障设备对武器装备故障检测周期过长以及测试资源在测试周期中被单个故障装备长时间占用的问题,对基于云测试(Cloud Testing)的自动测试系统(ATS,Automatic Test System)的体系架构进行了研究。以软件可移植性、硬件可互换性和系统互操作性为设计原则,对面向信号测试领域的云测试系统的体系架构进行了分析;在充分研究现有ATS的体系架构及其存在的突出问题的基础上,提出了基于云测试的ATS的软、硬件模型。为构建基于云测试的自动测试系统的开发和相关关键技术的研究提供了以有益的借鉴并打下了坚实的基础。     

Nonlinear optical response of an atom in the field of femtosecond laser pulses with near-atomic intensity

A theory of the nonresonant response of a single atom in a state with arbitrary magnitude and direction of the angular momentum of an atomic electron with respect to the polarization vector of the acting electromagnetic field has been developed. It has been shown that the atomic response current has a tensor structure and depends both on the direction of the angular momentum of the atom and on the polarization vector of the external field. The tensor character of the response is due to the effects of the anisotropy of probability density distribution of the atomic electron as compared to the case of the free atom. The selection rules for the axisymmetric problem of the atom in the field have been analyzed. The manifestation of the selection rules in the angular spectra of photoelectrons has been demonstrated. The probability of the ionization of the atom has been analyzed as a function of the amplitude and duration of the pulse. It has been shown that the width of the generation spectrum is a nonlinear function of the field strength and is saturated in the region of nearly atomic fields. Methods for controlling the parameters of the atomic response spectrum have been proposed on the basis of the use of a sequence of laser pulses with various time profiles, carrier frequencies, and polarization states. It has been shown that the generation of terahertz radiation is possible in the preionization regime, where the generation mechanism is attributed to atomic nonlinearity.     

驱动场作用下二分量BEC中原子数密度的演化

运用数值模拟研究了二分量玻色-爱因斯坦凝聚体(BEC)原子数密度的动力学行为,讨论了驱动场耦合强度、不同分量间原子作用强度、射频场频率及同分量内原子作用强度对二分量原子数密度演化特性的影响.结果显示:原子数密度随时间近似作周期性振荡,其振荡的周期随驱动耦合场强度、不同分量原子间作用强度的增大而减小,随自耦合强度的增大而增大;射频场频率的变化并不显著改变原子数密度振荡的周期,但它的增大会和自耦合强度的增大一样导致原子密度振荡的振幅减小.     

Reconstruction of synthesized holograms-Fresnel projectors at angles of incidence of reconstructing wave that exceed the angle of incidence of the reference wave in hologram synthesis

The possibility of the aberration-free reconstruction of a synthesized hologram-Fresnel projector in the case when the angles of incidence of the reconstructing plane wave exceed the angle of incidence of the plane reference wave during hologram synthesis is shown. The character of the dependence of admissible angles of incidence of the reconstructing wave on the parameters of the synthesis of hologram projectors is revealed and described mathematically. The results of an experimental study that confirms the possibility of the aberration-free reconstruction of hologram projectors at angles of incidence of the reconstructing plane wave that exceed the angle of incidence of the reference wave of the plane are presented. The results of the successful implementation of the projection photolithography process using a synthesized relief-phase reflection hologram-Fresnel projector are demonstrated.     

基于波形构型分析的脉冲电路设计方法研究

在脉冲电路设计中,需要根据实际应用的波形要求和负载特性选择、设计其电路构型。工程设计中常用的时域波形叠加和参数扫描等波形构型设计方法存在较大局限性,难以形成对脉冲波形构型的物理本质、脉冲电路结构对负载的适应性等方面的系统认识。从分析影响脉冲波形构型的基本要素入手,从时域和频域角度对脉冲波形构型及其电路实现方法进行系统的分析和归纳,给出时域和频域的电路构型设计方法及相应的电路参数解算方法,使设计人员可采用解析分析方法判断电路中元器件参数的调整方向,同时推动电路设计创新。     

多光子Jaynes-Cummings模型中与Glauber-Lachs态相互作用原子的熵压缩

利用全量子理论,研究了多光子Jaynes-Cummings模型中与Glauber-Lachs态相互作用的混合态原子的信息熵压缩。讨论了相干平均光子数、热平均光子数、跃迁光子数、原子初态参量对原子信息熵压缩的影响。结果表明原子信息熵 分量没有熵压缩性质;相干平均光子数取值适当时,原子信息熵 分量呈现熵压缩效应;热平均光子数、跃迁光子数会破坏原子信息熵 分量的熵压缩效应;原子初态参量对原子信息熵 分量能否呈现熵压缩效应没有决定性作用;伴随双光子跃迁时,原子的熵压缩因子的时间演化曲线呈现周期性。     

Electronic States and Photoprocesses in Bichromophore Systems

We present the results of quantumchemical investigation of energy transfer in organic molecules and systems and the inferences drawn. The Förster theory has been subjected to a critical analysis in order that the energy transfer could be described in the context of the current theory of nonradiative transitions and the incorrectness of the basic premises of the Förster theory has been demonstrated. A new variant of the mechanism of electronic energy transfer on the basis of the theory of electron transitions and of the quantum mechanics of molecules has been suggested. It is shown that the interaction of the molecules of the donor and acceptor perturbs the electronic states of isolated molecules even before the excitation of the donor molecule. A characteristic feature of the manifestation of intermolecular interaction is the spatial delocalization of the wave functions of the electronic states of interacting molecules, leading to the possibility of occurrence of conventional photophysical processes with participation of the electronic states of various molecules of the bimolecular system. In experimental investigations, the result of the intermolecular nonradiative transition is recorded as evidence of the spatial transfer of the energy of electronic excitation from the donor molecule to the acceptor molecule.     

Ferromagnetic resonance in interacting magnetic microstrips

The results of the micromagnetic simulation of forced oscillations of the magnetization in a system of two interacting microstrips located at an angle to each other have been presented. The ferromagnetic resonance spectra and the mode composition of resonant oscillations of the system have been investigated under the conditions of magnetostatic and exchange interactions between the microstrips. It has been shown that the magnetostatic interaction leads to the possibility of the excitation of in-phase and out-of-phase coupled oscillations of the magnetization of the microstrips. In the systems of exchange-coupled microstrips, there are intense resonances due to oscillations of the domain walls. The transformation of the ferromagnetic resonance spectrum and the change in the mode composition of resonant oscillations in different equilibrium configurations of the magnetization of the system have been discussed, as well as the conditions for the excitation of oscillations of different types depending on the direction of the microwave magnetic field.