高功率激光焊接光致等离子体的检测

系统地归纳了高功率激光焊接过程中光致等离子体的声、光、电、热等四种特征信号,综述了国外在等离子体信号检测方面的试验方法及研究进展,分析了未来的发展趋势。     

Handling of fine-particles by time-averaged particle driving method in plasmas

We developed a noble technique for the fine-particle handling in plasmas. In this method a pair of point electrodes are introduced in the plasma, to which positive pulses are applied alternatively. When the pulse repetition period is shorter than the particle response time, the particles feel only time-averaged force because of their large mass. Spatial profile of the equivalent potential of the time-averaged force varies from a circle to an ellipse with an increase in the local discharge at the electrodes. The particles are eventually transported toward a middle point between two point-electrodes, being almost independent of their initial positions. This method is quite effective for converging fine particles in the plasma.     

35CrMoCe稀土钢离子硫氮碳复合渗特性研究

采用金相显微镜，Ｘ射线衍射仪，透明电子显微镜，扫描电子显微镜等仪器分析对比３５ＣｒＭｏ钢和３５ＣｒＭｏＣｅ钢离子硫氮碳复合渗特性，探讨了稀土铈和加速离子硫氮碳复合渗的原因，研究结果表明，两种钢的复合渗层均由硫化物层，氮碳化物层的扩展层构成；稀土铈显著地提高了渗层深度，铈具有细化组织的作用，提供了更多可供氮碳原子扩散的通道。     

低温等离子体对天然胶原材料表面改性的研究

采用牛腱中提取的胶原蛋白为原料，制成薄膜试样，在Ｏ２和Ａｒ条件下，用低温等离子体处理天然胶原薄膜的表面．处理后的试样通过电子光谱（ＥＳＣＡ），红外光谱（ＩＲ），Ｘ射线衍射和接触角测量来研究其结构和性能的变化．实验表明：处理后胶原材料的表面、内部结构及化学成分都发生了明显的变化；它与水和二碘甲烷的接触角明显小于等离子处理前的可见低温等离子体方法能用于胶原材料的改性．     

SiH4＋CH4激光等离子体动力学时空特性

采用时间，空间分辨的等离子体光辐射诊断技术，研究了脉冲ＴＥＡＣＯ２激光诱发ＳｉＨ４＋ＣＨ４击穿产生的等离子体膨胀过程，得到不同空间位置，不同实验条件下等离子体发光的时间特性，证明了ＳｉＨ４＋ＣＨ４气体击穿产生爆燃波而后诱发激波是等离子体中基本宏观动力学过程，并在实验上分析了激波对等离体内化学反应的影响，为激光等离子体合成ＳｉＣ粉末微观反应动力学过程的研究提供了参考数据。     

等离子体聚合有机膜的离子注入改性

以苯胺为单体在等离子体条件下进行聚合，测量所合成的有机膜经１００ｋｅＶ、５×１０１５ｃｍ￣（－２）Ａｒ￣＋注入后电阻率的变化，并用ＦＴＩＲ、ＸＰＳ和核分析方法对离子注入引起的结构和成分改变进行了探讨。结果表明，在等离子体环境下，聚合膜内仍含有大量环结构。由于Ａｒ￣＋的注入，聚合膜表面损伤而碳化，使注入层内的体电阻率降低１１个数量级。     

Differential proteomics of human seminal plasma: A potential target for searching male infertility marker proteins

The clinical fertility tests, available in the market, fail to define the exact cause of male infertility in almost half of the cases and point toward a crucial need of developing better ways of infertility investigations. The protein biomarkers may help us toward better understanding of unknown cases of male infertility that, in turn, can guide us to find better therapeutic solutions. Many clinical attempts have been made to identify biomarkers of male infertility in sperm proteome but only few studies have targeted seminal plasma. Human seminal plasma is a rich source of proteins that are essentially required for development of sperm and successful fertilization. This viewpoint article highlights the importance of human seminal plasma proteome in reproductive physiology and suggests that differential proteomics integrated with functional analysis may help us in searching potential biomarkers of male infertility.     

Parametric study of the electrical to thermal power conversion in an inductively coupledrf plasma torch

An inductively coupled (ic) radio-frequency (rf) stabilized argon plasma was generated in a quartz tube using a 7 MHzrf generator. The electrical and thermal powers were measured and the efficiency of energy conversion was computed. The results indicate that for a constant power input, there is an optimum argon flow rate for which maximum energy conversion efficiency occurs.     

CO2 laser annealing of plasma-deposited high-Tcsuperconducting thick films

Recent advances in the fabrication of high-T _c superconducting thick films demand processing techniques which can eliminate film/substrate interdifiusion that occurs during subsequent post-annealing heat treatment after the film is deposited, thereby limiting the application of the thick films for devices. The present study evaluates laser annealing techniques for plasma-deposited Y-Ba-Cu-O thick films using a high-energy CO₂ laser (10.6m) in a continuous wave mode. The results are compared with those obtained by conventional furnace annealing techniques necessary for post-heat treatment of as-deposited superconducting thick films. The high-T _c superconducting phase is recovered by cationic diffusion during subsequent post-annealing heat treatment. Crystallographic phases and microstructural characterization have been performed using XRD, SEM, and EPMA analytical techniques. The significance of the technology lies in the elimination of film/substrate interdiffusion problems, thereby resulting in high-quality superconducting thick films. The technology will significantly reduce the post-annealing times usually required by conventional furnace annealing techniques.     

Experimental results of the erosion of molybdenum due to blistering by He+ bombardment

We report some preliminary measurement of the erosion rate of plasma dumps when bombarded with 100 keV He⁺ ions at high power density ( 1 MW/m²). The expected erosion rates, based on measurements of He blistering that were made at lower power density ( 0.3 MW/m²), indicate a potentially serious problem for fusion reactors. Our tests use a reactorlike power density and produce He blisters at a rate that is slower than predicted by 2 to 4 orders of magnitude, depending on the temperature of the molybdenum target.