速调管离子噪声特性的模拟分析

 离子噪声已成为影响现代微波管性能的一个重要因素，采用一维混合模型研究了速调管的离子噪声，用自编的1维粒子模拟程序对速调管的离子噪声特性进行了分析。采用小信号近似，从理论上推导出了速调管离子噪声与相位畸变关系的表达式，表明微波管相位噪声直接来源于管内离子量的变化。模拟了有离子噪声时速调管的相位特性，对模拟过程做了离子诊断并与实验结果进行比较，证明了模拟过程的正确性。探讨了电子束电流、电压以及聚焦磁场对离子噪声的影响规律，束电流与束电压改变后，离子噪声的周期与大小相应改变，增大束电流，离子噪声幅度会下降，并趋于稳定，而在束电流不变的情况下，离子噪声存在一个最小值。束电流与束电压确定，存在最佳的磁场使离子噪声幅度最小。     

Structure of Cytochromec and Its Platinum-modified Derivatives by Fourier Transform Infrared Spectroscopy

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葡萄糖粉末的近红外光谱

糖尿病患者的自我监测是减少由糖尿病引发并发症的重要手段。无创血糖监测的近红外光谱分析方法是最具有应用前景的一种，葡萄糖近红外光谱则是研究无损血糖检测基础。本文通过实验采集了葡萄糖粉末的近红外光谱，并对结果作了详细分析。     

电力安全与超导磁储能系统

随着我国大规模电力系统的逐步形成,电网的安全稳定问题日渐突出,保证电力系统的安全稳定运行已经成为电网发展和运行的重要任务.超导磁储能系统以其对系统功率需求的快速响应特性可以为提高电力系统的稳定性提供新的技术途径,同时对改善电能质量、提高可靠性也有很好的技术优势.本文在简要论证电力安全的重要性的基础上,对SMES提高系统的安全稳定性的优越性进行了分析,并介绍了国家863计划项目"高温超导磁储能系统"的工作进展.     

采暖居住建筑实施节能65%--围护结构传热系数的确定

以围护结构的耗热量指标、传热系数限值和门窗空气渗透耗热量为重点,对严寒地区居住建筑实施节能65%进行了分析,提出围护结构各部分的传热系数限值.对围护结构如何实现节能65%的要求,从围护结构构造和技术角度进行了讨论;并阐述降低门窗部位的空气渗透耗热量是下一步节能的关键.     

Study on the synthesis and crystal structure of tetrahyhrated tetraaquotris(4-mono-chloroacetylantipyrine)samarium (Ⅲ) perchlorate

Based on the phase equilibrium study of the system Sm(ClO4)3-4-monochloroace-tylantipyrine (C13H13ClN2O2)-H2O at 30℃, we have synthesized the title complex [Sm(C13H13Cl. N2O2)3(H2O)4](C1O4)3.4H2O. The single crystal structure analysis on RASA-IIS Rigaku diffrac-tometer shows that the coordination number of the metal ion is nine and the geometry of the complex is tricapped trigonal prism. Two of the three molecules of organic ligand act as bidentate chelated through both carbonyl oxygens to the metal ion, but the other one as a monodentate coordinated only through the ring carbonyl oxygen, the side chain carbonyl is far away from the central ion. The crystal is monoclinic, space group P21, a = 18.013(4), 6 = 14.709(3), c = 10.536(3) A, β=94.69(2)°, V=2782(1) A3, Z=2.     

中国古代趣味物理实验十摘

从中国若干典籍中采撷了10个趣味性较浓的物理实验。这些实验构思奇特，设计巧妙，且大多可用于课堂演示，对了解中国古代物理实验发展的历程具有一定参考价值。     

THE ADSORPTION BEHAVIORS OF 2,6-DICHLOROPHENOL ONTO HYPERCROSSLINKED RESINS

1. INTRODUCTION Chlorophenolic compounds are very toxic, and many are known or suspected human carcinogens. They have been widely used for many industrial purposes. The removals of chlorophenols are of high industrial and environmental interest [1~2]. The adsorption resin is another adsorbent widely employed for isolation and purification of organic substances, treatment of wastewaters, solid phase extraction, and so on. A variety of materials has been developed and tested, such as Amber…     

Behaviour of Self-Standing CVD Diamond Film with Different Dominant Crystalline Surfaces in Thermal-Iron Plate Polishing

Self-standing CVD diamond films with different dominant crystalline surfaces are polished by the thermal-iron plate polishing method. The influence of the dominant crystalline surfaces on polishing etfficiency is investigated by measuring the removal rate and final roughness. The smallest rms roughness of 0.14 μm is measured with smallest removal rate in the films with the initial （220） dominant crystalline surface. Activation energy for the polishing is analysed by the Arrhenius relation. It is found that the values are 170kJ/mol, 222kJ/mol and 214kJ/mol for the film with three different dominant crystalline surfaces. Based on these values, the polishing cause is regarded as the graphitization-controlling process. In the experiment, we find that transformation of the dominant crystalline surfaces from （111） to （220） always appears in the polishing process when we polish the （111） dominant surface.     

测度链上的柯西不等式

研究了测度链上的柯西不等式,给出测度链上柯西不等式的具体形式.此外,还对测度链上的柯西不等式作了推广.