毫米波圆柱波导自由电子激光放大器的数值模拟

本文以单粒子理论为基础，在不计空间电荷效应的近似条件下推导了带轴向引导磁场的三维圆柱波导非线性模拟方程组。用CAGFEL程序计算、分析了在带入口区、常数摇摆器条件下两组不同物理参数的自由电子激光放大器的物理模型。计算结果可靠，物理图象合理。对于其中的第二组参数还着重考查了光波频率、输入功率和摇摆器场振幅改变对输出功率和效率的影响。上述这些计算结果对0．7MeV 自由电子激光放大器的设计和实验具有一定的参考价值。     

线阵CCD光积分时间的智能控制技术及其应用

本文提出了一种新型线阵ＣＣＤ驱动电路的设计方法，可以在不改变系统工作主频的情况下，连续地改变ＣＣＤ的光积分时间，并且可通过计算机接口实现智能调整，此项技术已成功应用于热扎线材外径的线检测仪中，控制效果极其理想。     

Superconductivity of bilayer titanium/indium thin film grown on SiO_2/Si(001)

Bilayer superconducting films with tunable transition temperature(Tc) are a critical ingredient to the fabrication of high-performance transition edge sensors. Commonly chosen materials include Mo/Au, Mo/Cu, Ti/Au, and Ti/Al systems. Here in this work, titanium/indium(Ti/In) bilayer superconducting films are successfully fabricated on SiO_2/Si(001)substrates by molecular beam epitaxy(MBE). The success in the epitaxial growth of indium on titanium is achieved by lowering the substrate temperature to-150?C during indium evaporation. We measure the critical temperature under a bias current of 10 μA, and obtain different superconducting transition temperatures ranging from 645 m K to 2.7 K by adjusting the thickness ratio of Ti/In. Our results demonstrate that the transition temperature decreases as the thickness ratio of Ti/In increases.     

基于红外热成像的林地余火死灰复燃点诊断方法研究（英文）

林地余火阴燃特性具有隐蔽性强、持续时间长、目测难度大、且具有死灰复燃等特点,从而一直困扰森林火灾的彻底扑灭。为了及时、高效地发现林地余火阴燃点,探索林地余火死灰复燃的特征及规律,在南京森林警察学院点烧基地里进行测试实验,以无人机搭载热红外成像系统、气象采集系统等为工具,把火源点设置在杨树林内,人为干预进行点烧、熄灭、复燃等重复实验,实验包括白天和夜晚两个时间段,用安装于无人机上的红外热成像仪对火源进行观测。实验表明:林地余火死灰复燃的温度在500~600℃,离散程度较大;林地余火死灰复燃在白天的时间普遍短于夜晚时间,表明外界温度越高,越会促进林地余火死灰复燃的速率;在森林中,不同地点、不同时间段的森林背景温度标准差比较稳定,主要处于1~9之间;林地余火红外图像的温度数据的标准差值分布在30~85之间;红外图像的温度数据的标准差值分布在55~85之间,则可定为死灰复燃可疑阶段。该方法量化了死灰复燃的火环境及温度参数阈值,明确林地余火阴燃点引燃特征值。该研究成果将推动森林防火技术的发展,为安全扑火提供重要的方法和资料。     

Low cost, practical, all-digital open-loop fiber-optic gyroscope

A novel all-digital scheme for open-loop fiber-optic gyroscope (POG), where only two key points of output wave were digitized directly, has been proposed. A control equation, with which the modulation depth of PZT modulator is stable when setting the modulation depth as 4.35 and a calculation equation, with which the Sagnac phase can be worked out, are derived. A modulation depth control and an automatic correlation sampling and a gain control technology were induced. A photo-type FOG was made and tested. The good performance was achieved.     

Self-assembly behaviour of amphiphilic diblock copolymer in selective solvents studied by synchrotron small-angle x-ray scattering

The aggregation behaviour of styrene-vinyl benzoic acid (PSm-b-PVBAn) amphiphilic diblock copolymers in selective solvents with different m and n was investigated by synchrotron small-angle x-ray scattering (SAXS). We have carried out a detailed analysis of scattering intensity, dimension, shape and microstructure of the diblock copolymers of narrow distribution in water, methanol, ethanol and isopropanol selective solvents, respectively. We have found that the aggregation behaviour of the copolymer depends on the nature of the solvent and the micelle forms fiat disc objects with the ratio of radius ω=0.4. The average radius gyration Rg of the copolymer decreases as solvents change from isopropanol to ethanol and to methanol, and increases with increasing pH in aqueous solution, but decreases with the addition of COCl2 in ethanol solvent. The scattering intensity of diblock copolymer micelle follows I(h) ∝ h^-α in different selective solutions, suggesting that the PSm-b-PVBAn coils have self-similar structure behaviour or a fractal structure in the selective solvents. All of these revealed that the aggregation behaviour of the diblock copolymer changes dramatically with experimental condition in the selective solvent. The increase of mass fractal dimension (Dm) from 2.12 to 2.47 indicates that the copolymer chain changes from a swollen coil to a rather compact disc in the course of changing solvents, decreasing surface fractal dimension (Ds) from 2.98 to 2.58 indicates that the copolymer micelle change from a rather rough surface to a smooth form in the course of increasing pH in aqueous solutions, and increasing Dm and Ds from 2.29 to 2.35 and 2.70 to 2.90, respectively, indicates the shrinkage of copolymer micelle to a rather compact and rough disc form by adding COCl2 in ethanol solvents.     

Energy Density in Quark-Gluon Plasma

We study the energy density in quark-gluon plasma. At the very high temperature, the quark matter is a hot and dense matter in the colour deconfinement condition, and quarks can coalescent diquarks. Energy density of this system is worked out and compared with the energy density in the other two kinds of situations. Possible energy density is about ε0≈2.4 GeV/fm^3 according to our estimation for quark matter including diquarks.     

基于圆偏振探测光的光纤原子自旋进动检测技术

分析了极化碱金属气室的旋光特性,极化的原子气室宏观上可等效为一种法拉第旋光晶体,其旋光系数与原子自旋进动相关。提出了采用圆偏振探测光测量通过气室的左右旋圆偏振光相位差来实现原子自旋进动检测的思路。基于改进的全光纤反射型Sagnac干涉仪,搭建了光纤原子自旋进动检测系统,通过圆偏振探测光实现了无自旋交换弛豫态自旋进动信号的检测。在原子自旋陀螺仪实验平台上进行了实验验证并实现了陀螺效应,实验结果证明了所提理论的正确性。对陀螺性能进行了初步测试,得到其零偏不稳定性为0.29(°)/h。     

试论我国社会心理学的研究方向

本文对美、苏两国的社会心理学研究作较系统的分析，着重探索我国社会心理学的研究，应该运用唯物的辨证的原则和方法，将其各种有价值的理论有机地统一起来，不断创新，形成比较完备的体系。     

一种简单的生物化学比例在鉴别上和下胃肠道出血上的价值

我们回顾了59例出血来源在初期不清楚,但经后来观察诊断明确的胃肠道出血的患者,证实入院时血浆尿素与肌酐浓度比例在区别上和下胃肠道来源的出血时准确性很高。不论丢失的血液体积多少,38例上胃肠道出血患者中有33例(占87％)其比值为100或超过100,21例下胃肠道出血患者中20例(占95％)其比值低于100,全部准确性达90％。这比值的增高与临床证明的血容量减少的程度无相关系。这一简单的比值在未证实胃肠道出血来源的病人决定观察结果时可能是有价值的。