脉冲变压器锥形绕组电压分布数值分析

为实现高压、大电流脉冲变压器在高重复频率电压作用下稳定运行，变压器的绝缘选择与布置是其设计时重点考虑的问题之一。在短脉宽、高幅值的电压作用下，变压器绕组本身形成了一个不均匀场，如果绕组绝缘结构设计不当，就很容易在绕组的局部产生畸变的强电场，导致变压器绕组击穿，对脉冲功率发生装置的研制工作造成了极大的危害。这种现象在高频下更为明显。因此，研究高功率脉冲变压器绕组的电压分布，采用适当的措施实施有效方法进行绕组结构优化设计，改善高功率脉冲变压器绕组的电压分布，将会在很大程度上提高高功率脉冲变压器重复工作的能力，对保证高功率脉冲发生器可靠、安全运行具有重要的理论与工程意义。     

温度对脱硫剂钙利用率和蒸汽活化效果的影响

在中温烟气脱硫过程中,蒸汽活化对于提高脱硫剂的钙利用率和脱硫效率起到了显著的作用。为了确定温度对于蒸汽活化效果的影响,研究了200～800℃的蒸汽温度范围内钙利用率的变化,给出了合适的蒸汽活化温度。进而分别在400、600、800℃条件下研究了脱硫反应温度与蒸汽活化温度的关系,提出了中温循环流化床烟气脱硫的适用温度范围。     

A Novel Frequency Measurement Method Suitable for a Large Frequency Ratio Condition

As for the obstacles to direct comparison between superhigh and lower frequencies, we accomplish the accurate comparison between low and microwave frequencies with the 10^5 ratios of the operating frequencies on the basis of phase comparison between the signals whose frequencies are related by an arbitrary integer. This method is simple and accurate, and will be widely used as a special frequency comparison approach.     

Ab-Initio Study of Electronic Structure and Magnetic Properties of Pipz-H2 [MnF4（HF2）]

The full-potential linearized augmented plane wave method was applied to study the electronic and the magnetic properties of the compound pipz-H2[MnF4(HF2)](pipz=piperazine). The band structure, the total density of states, the partial density of states and the electron density were calculated to explain the electronic and the magnetic properties of pipz-H2[MnF4(HF2)] in the ferromagnetic state. It is found that the magnetic moment of the molecule mainly comes from the Mn atoms with partial contribution from the F atoms. The symmetrical σ/σ bonds via H atoms along Mn-F-H-F-Mn chains and the weak direct-exchange interaction between F(2), F(3) and Mn atoms have effect on the electronic structure and the magnetism of pipz-H2 [MnF4(HF2)].     

柔性透明导电薄膜(ITO)简介

柔性透明导电薄膜 (ＩＴＯ)是一种新型半导体材料 ,目前主要依赖进口 ,但价格昴贵 ,国内生产厂家较少。深圳市北庆薄膜技术有限公司经多年研制、开发 ,形成了年产 50 ,0 0 0ｍ2 透明导电膜 (ＩＴＯ)的能力 ,产品质量完全可以替代同类进口产品。北庆公司所生产的导电膜具有重量轻、体薄、导电性能好、附着力强、透过率高、耐冲击、可弯曲、可任意冲裁加工等优点。该产品可以用作光电子器件的透明电极、电磁静电屏蔽的透明视窗、观察窗以及防霜加热膜 ,还可以用在特殊要求的透明器件上作防静电包装。在某些方面它可以取代导电玻璃 ,并且可以开…     

单参数非线性问题中高阶奇异点的计算

本文考虑计算单参数非线性问题中高阶奇异点的数值方法，基于确定奇异点的一个普适的扩张系统，结合同伦参数的拟弧长延拓，给出了计算各类高阶奇异点的一个统一算法，数值例子表明了算法的有效性．     

基于单细胞拉曼光谱技术的葡萄球菌黄素生物合成分析

利用光镊拉曼光谱技术研究吲哚对金葡菌细胞中葡萄球菌黄素合成的抑制作用以及色素含量在分批培养过程中的动态变化。收集经不同浓度吲哚(终浓度为0,0.2,0.6,0.8,1.2和1.5 mmol/L)处理后的以及不同培养时间的金葡菌单细胞的拉曼光谱,以光谱1523 cm-1峰强度表征色素含量,并与紫外可见分光光度法得到的结果进行比较。结果表明,细菌拉曼光谱1523 cm-1峰强度与分光光度法测得的色素含量有良好的线性关系,相关系数达0.9772;群体和单细胞水平的光谱数据均表明,吲哚可剂量依赖性地抑制葡萄球菌黄素的合成,色素含量降低幅度超过70%;在分批培养中细菌色素含量在对数生长中期(12 h)达到最大值,各个时间点的群体内部细胞间色素含量的异质性较小,RSD在39.2%~61.1%之间。本研究表明光镊拉曼光谱技术是一种在单细胞水平分析葡萄球菌黄素含量的可靠方法。     

α铁晶界熵及表面张力的分子动力学模拟

晶界也是一种界面。表面张力是晶界的一个重要的热力学量。本文采用计算机分子动力学模拟(CMD)方法计算 α-Fe,∑=9 的晶界在不同温度和压力下的表面张力,结果与实验值的比较是满意的。发现熵对晶界的表面张力的贡献是很小的,通常可以忽略不计。     

弹性动力学的应力效应

讨论了弹性动力学中的应力应变关系，并给出一种修正的关系式。     

Diethanol ammonium-borate based polybetaine with tunable UCST phase transition

A betaine-type styrene monomer with the quaternary ammonium-borate anion inner-salt pair was synthesized through the quaternization reaction and polymerized to afford the target polybetaine of poly(4-vinylbenzyl methyl-diethanol ammonium borate)(PVMAB). The chemical structures of the monomer and polymer were well demonstrated with ~1H-NMR and ~(11)B-NMR spectra analysis. The thermal-sensitive experiment showed that PVMAB in water afforded gradually welldefined sigmoidal transmittance-temperature(T-t) curves along with the increasing polymer concentration. However, the phase transition temperatures at the bottom of the S-shaped curves were always below 10 ℃ due to the very weak zwitterionic association of the ammonium-borate inner-salt pairs. The UCST phase transition could also be tuned by changing the ethanol content in the ethanol/water mixture. And the cytotoxicity experiment demonstrated the good biomimetic property of PVMAB. This study enriches the toolbox of polybetaines by introducing the quaternary ammoniumborate anion zwitterionic pair in the repeat units, therefore broadens the scope of synthetic polybetaines.