等离子体电枢电磁轨道炮电枢电弧长度的测量

对用Ｂ－ｄｏｔ磁探针测量三维等离子体电枢电弧长度的原理进了理论分析,给出了根据记录的磁探针信号波形计算等离子体电枢电弧长度的判据．通过实测的数据对判据的准确性进行了实验分析与验证．     

磁场对PET表面碳氟等离子体改性的影响(Ⅰ)

利用变角XPS方法研究不同磁场条件下碳氟等离子体对PET表面的改性,并探讨了磁场对碳氟等离子体聚合的影响．实验结果表明,随磁场强度的增加,碳氟混合气体等离子体发生从聚合区域向刻蚀区域过渡的转折点向CF4含量低的方向移动;碳氟混合气体等离子体的不同作用区域的特征得到增强．     

Plasma Modification of Wool: The Effect of Plasma Gas on the Properties of the Wool Fabric

The wool fabrics were treated with low temperature plasma (LTP) using three different gases, namely (ⅰ) oxygen, (ⅱ) nitrogen and (ⅲ) 25％ hydrogen/75％ nitrogen gas mixture. After LTP treatment, the low stress mechanical properties, surface properties and thermal properties of the fabrics were investigated by kES-F (Kawabata Evaluation System) Instruments composing of KES-FBI for tensile and shear property measurement, KES-FB2 for pure bending measurement, kES-FB3 for compression measurement, KES-FB4 for surface friction and surface roughness measurement, and KES-F7 for thermal property measurement. The first four instruments were used for investigating the charaeterlstlc aspect related to fabrle hand while the last one was mainly for the fabric comfort. The properties of LTP treated fabrics under the effect of different gases were compared with the untreated fabric quantitatively.     

Microstructure studies of air-plasma-spray-deposited CoNiCrAlY coatings before and after thermal cyclic loading for high-temperature application

In the present study, bond-coats for thermal barrier coatings were deposited via air plasma spraying (APS) techniques onto Inconel 800 and Hastelloy C-276 alloy substrates. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and atomic force microscopy (AFM) were used to investigate the phases and microstructure of the as-sprayed, APS-deposited CoNiCrAlY bond-coatings. The aim of this work was to study the suitability of the bond-coat materials for high temperature applications. Confirmation of nanoscale grains of the γ/γ′-phase was obtained by TEM, high-resolution TEM, and AFM. We concluded that these changes result from the plastic deformation of the bond-coat during the deposition, resulting in CoNiCrAlY bond-coatings with excellent thermal cyclic resistance suitable for use in high-temperature applications. Cyclic oxidative stability was observed to also depend on the underlying metallic alloy substrate.     

尺寸形貌对硅纳米锥阵列结构反射特性的影响

为了探讨不同尺度和形貌的硅纳米锥阵列结构表面的光学特性,采用基于纳米粒子自组装薄膜掩蔽的亚微米干法刻蚀工艺,在硅基材表面制备了纳米锥阵列结构,并对纳米锥阵列结构进行了形貌表征及光学测试。结果表明,采用SF6和C4F8混合气体,其体积流量分别为12sccm和27sccm,功率750 W,偏压25V时,可以获得光学减反射性能优异的纳米锥阵列结构。通过调节刻蚀时长获得形貌相似而尺寸不同的硅纳米锥阵列结构。200nm和400nm周期硅纳米锥阵列结构表面具有2%～3%的反射率,而800nm周期硅纳米锥阵列结构表面则接近于硅基材背面的反射率并高于10%,说明亚波长结构的减反射特性更加显著。从实验上揭示了尺寸形貌对硅纳米锥阵列结构反射特性的影响规律,为进一步研究光学器件方面的应用提供了参考。     

等离子体低压电极孔对点火起爆的影响

针对以低温等离子体点火起爆的脉冲爆震发动机,研究放电区体积不变,低压电极孔对点火触发爆震发展过程的影响. 以丙烷为燃料,空气和纯氧为氧化剂,充分考虑其详细化学反应动力学机理,将低温等离子体放电区等效为高温高压火核,利用Fluent软件,对不同低压电极孔数和直径的5种点火器结构,进行点火起爆过程数值模拟. 结果显示,低压电极孔数多、直径大,初始阶段放电区压力和温度下降快;爆震管内轴向初始火焰体积随低压电极孔面积增大而减小、火焰传播速度变慢,爆震波峰值压力增加缓慢,DDT时间大幅增加;低压电极孔面积越小,越有利于触发爆震;对多循环工作的PDE,需合理设定低压电极孔数和直径,以获得良好的点火起爆特性.      

Interfacial behavior of Fe76Si9B10P5/Zn0.5Ni0.5Fe2O4 amorphous soft magnetic composite during spark plasma sintering process

Fe_(76)Si_9B_(10)P_5/Zn_(0.5)Ni_(0.5)Fe_2O_4 amorphous composite with micro-cellular structure and high electrical resistivity was prepared by spark plasma sintering(SPS) at 487 °C. XRD and SEM results showed that the Fe_(76)Si_9B_(10)P_5 alloy powders remained the amorphous state and the composite was dense. A fusion zone at interface of Fe_(76)Si_9B_(10)P_5 cell body and Zn_(0.5)Ni_(0.5)Fe_2O_4 cell wall was observed by TEM, which also indicates the formation of local high temperature. The interface bonding based on the formation of local high temperature in SPS process was observed. It is believed that the tip effect of Zn_(0.5)Ni_(0.5)Fe_2O_4 nanoparticles promotes the local discharging and plasmas creation in the gaps, and the discharging energy forms an instantaneous local high temperature to complete the local sintering and the densification of Zn_(0.5)Ni_(0.5)Fe_2O_4 particles at a low nominal sinter temperature. Simultaneously, the local high temperature stimulates the adjacent gaps discharging, thus facilitate the continuous formation of new discharging path. Finally, sintering and densification of the amorphous composite is complete.     

碳掺杂二氧化钛的稀磁特性

作为新型材料的稀磁半导体(DMS)在大规模集成电路、高频率器件和光电子器件等方面得到广泛的运用.这主要源于稀磁半导体(DMS)同时具备半导体的电学性质和磁性材料的磁学性质.采用放电等离子烧结(SPS)制备了碳纳米管掺杂的锐钛矿相二氧化钛和未掺杂锐钛矿相二氧化钛样品,样品的结构、形貌、成分、氧空位和磁性等物理性质分别通过XRD,TEM,Raman,XPS,PL,VSM等表征手段进行了分析.综合实验结果,发现氧空位的存在和室温铁磁性正相关.     

血浆粘度对血浆与红细胞的动量交换影响

基于血浆粘度对血浆与红细胞的动量交换在血液循环系统中的重大影响,通过全血离散模型的创建,运用差分法得到血浆粘度对血浆与红细胞的动量交换关系式,分析得到红细胞的聚集与血浆粘度有关,并由此解释了老年慢性病的原因与此有关。     

棉织物的低温氧等离子改性研究

采用低温氧等离子体对纯棉坯布进行改性处理,研究了低温等离子处理后棉纤维的微观形态。探讨了处理功率和处理时间等参数对棉织物的强力、吸湿和失重率的影响,并与常规棉织物前处理工艺进行了对比。