用CF4等离子体制备无水胶印版材斥墨层

采用射频等离子体化学气相沉积设备,以CF4为反应气体,进行了无水胶印版材斥墨层制备的实验.研究了不同等离子体参数(功率、气压和时间)对聚合薄膜性能的影响,并通过接触角、红外光谱、扫描电子显微镜对薄膜表面结构和性能的表征,对等离子体工艺进行优化,得到了表面疏水性能良好的低表面能薄膜.推墨实验结果表明,所聚合的薄膜基本达到斥墨层的要求,用含氟等离子体技术制备无水胶印版材斥墨层的技术路线是可行的.     

A langmuir probe investigation of electron cyclotron resonance argon-hydrogen plasmas

We report on the physical attributes of an argon-hydrogen plasma and the effects that induced changes in these attributes have on the physical and electrical characteristics of the plasma itself. Changes in the plasma conditions of these argon-hydrogen plasmas due to variations in microwave power, DC biasing, gas concentrations, and pressures were measured. We determined that increasing the hydrogen flow increases the sheath potential of the plasma, thereby increasing the arrival energy of ions at the surface of a sample placed in the plasma. Even with the decrease in plasma density from an increase in hydrogen input flow, we found the ion current is maintained in the predominately hydrogen plasma and is likely compensated by the high velocity and long mean free path of the hydrogen. We also observed that increasing total pressure also results in hydrogen ions dominating the total number of ions reaching the Langmuir probe and therefore the sample during processing. Last, a model based on the ion/electron energy ratio was developed and used to determine the relative ion concentrations of hydrogen and argon ions.     

Time evolution of electrode voltage distribution in large-area capacitively coupled plasmas

Time evolution of non-uniform voltage distribution on the powered electrode in a large-area very-high-frequency (VHF) capacitively coupled plasma processing system is studied based on a one-dimensional transmission-line model with an equivalent-circuit model of the plasma. With this model, time evolution of voltage and current distributions on the electrode is examined at its activation by the power supply with various frequencies, waveforms, and power-supply locations. It has been found, with the power supply of multiple frequencies, that effects of beat waves can significantly affect plasma uniformity especially if the difference in frequency is small. It has been also demonstrated that, with multiple power-supply locations combined with multiple frequencies, good voltage uniformity over the long electrode can be obtained.     

Propagation Constant of a Rectangular Waveguides Completely Full of Ferrite Magnetized Longitudinally

This paper is an analysis of rectangular waveguide completely full of ferrite magnetized longitudinally. The analysis is based on the formulation of the transverse operator method (TOM), followed by the application of the Galerkin method. We obtain an eigenvalue equation system. The propagation constant of some homogenous and anisotropic waveguide structures with ferrite has been obtained. The results presented here show that the transverse operator formulation is not only an elegant theoretical form, but also a powerful and efficient analysis method, it is useful to solve a number of the propagation problems in electromagnetic. One advantage of this method is that it presents a fast convergence. Numerical examples are given for different cases and compared with the published results. A good agreement is obtained.     

中心螺线圈式大面积均匀金属等离子体形成方法

传统的磁过滤阴极真空弧系统的金属等离子体输出面积较小且出口处的密度呈高斯分布,阻碍了等离子体浸没离子注入与沉积(PⅢ&D)技术的工业化应用,使得大面积均匀金属等离子体的产生成为了业内研究的热点.本文提出了一种基于多阴极脉冲真空弧源对称配置的中心螺线圈式大面积均匀金属等离子体形成方法,可输出直径约为600mm的金属等离子体.沉积探针结果表明:载流螺线圈对沉积均匀性有较大的影响.单源X方向的沉积均匀性优于Y方向的沉积均匀性;四弧源的离子流密度约为单源的5.5倍,沉积均匀性最高可达83.8%.     

磁化等离子体中相对论磁声孤立波的动力学性质

本论文研究了柱几何条件下磁化等离子体中的相对论磁声孤立波,建立了弱相对论条件下关于磁声孤立波的部分相对论理论模型,利用约化摄动方法得到了描述相对论磁声孤立波的Cylindrical Korteweg-de Vries(CKdV)方程.研究结果表明柱磁声孤立波与一维情况下孤子的性质有很大的不同,在随时间的演化过程中柱磁声孤立波的振幅不断增加、宽度不断减小、运动速度也是增加的.     

响应面法优化磁化水提取燕麦麸皮多糖工艺

以燕麦麸皮为原料,多糖得率和蛋白质残留率为考察指标,比较了磁化水和纯净水对燕麦麸皮中多糖的提取效果,并采用响应面法对磁化水提取燕麦麸皮多糖工艺进行优化。结果表明,磁化水对麸皮多糖的提取效果优于纯净水,其最优提取条件为提取温度68 ℃、液料比18∶1（mL/g）、提取pH 8.7、提取时间105 min,多糖得率为（13.92±0.07）%,蛋白质残留率为（30.14±0.18）%,与纯净水提取相比,多糖得率提高了37.55%。对纯化后的多糖采用气相色谱法检测分析,其单糖含量为葡萄糖（60.9±1.3）%、木糖（21.1±1.1）%、阿拉伯糖（16.7±1.4）%,同时含有半乳糖（1.0±0.8）%和鼠李糖（0.3±0.1）%。     

磁化水钢纤维混凝土压拉性能试验与分析

为提高钢纤维混凝土的压拉性能,将磁化水技术应用到钢纤维混凝土中。对磁化水水流速度与钢纤维体积率进行正交试验,并制作标准试块进行压拉强度试验,研究磁化水对钢纤维混凝土压拉性能的影响。试验结果表明:磁化水能有效提高钢纤维混凝土的压拉强度,当磁场强度为285 mT,水流速度为2.1 m/s,钢纤维体积率为1.8%时,磁化水钢纤维混凝土的压拉强度与素混凝土相比,28天立方体抗压强度提高23.71%,劈裂抗拉强度提高43.63%。对磁化水增强钢纤维混凝土压拉性能机理进行分析可知,磁化水能通过提高混凝土压拉强度和改善钢纤维与混凝土间的界面粘结力,增强钢纤维混凝土的压拉性能。     

四川某难选褐铁矿选矿试验研究

针对四川某难选褐铁矿性质和特点,采用重选、强磁选、强磁-反浮选工艺进行选矿试验,所得铁精矿品位和回收率都很低;在条件优化试验基础上,采用磁化焙烧-磁选-反浮选工艺,最终可获得铁品位60.59%、回收率79.30%的铁精矿。该试验研究为四川某褐铁矿的开发利用奠定了基础,同时对于其他类似铁矿开发利用具有一定的参考价值和指导意义。     

Perspectives on Magnetized Target Fusion Power Plants

One approach to Magnetized Target Fusion (MTF) builds upon the ongoing experimental effort (FRX-L) to generate a Field Reversed Configuration (FRC) target plasma suitable for translation and cylindrical-liner (i.e., converging flux conserver) implosion. Numerical modeling is underway to elucidate key performance drivers for possible future power-plant extrapolations. The fusion gain, Q (ratio of DT fusion yield to the sum of initial liner kinetic energy plus plasma formation energy), sets the power-plant duty cycle for a nominal design electric power [e.g. 1,000 MWe(net)]. A pulsed MTF power plant of this type derives from the historic Fast Liner Reactor (FLR) concept and shares attributes with the recent Inertial Fusion Energy (IFE) Z-pinch and laser-driven pellet HYLIFE-II conceptual designs. Work supported by the Office of Science, OFES, through Los Alamos National Laboratory, under DOE contract W-7405-ENG-36.