Viscosity Characteristic in Metallic Melts with Medium／Short-Range Order Structures

Viscosities and liquid structure of alloys Cu75Al25, Cu87Sn13 and Al-12.5%Si and pure metals Cu and Sn are investigated by using torsional oscillation viscometry and high temperature x-ray diffractometry. The viscosities of pure metals and eutectic alloy melts along with the short-range order structure are found to follow the Arrhenius law in a wide range of temperature above the liquidus. The breakpoints in Arrhenius plots emerge when the structures of alloy melts are transformed from the medium-range order structure to the short-range order structure. It has been found that the change of the viscosity of the metallic alloys is a characteristic of microstructure transformation in the related melts.     

Transmission Properties of THz Radiation Pulses through Very Deep Zero-Order Metallic Gratings

Very deep zero-order metallic grating structures are processed to study the transmission properties of THz radiation pulses. The experiments have been performed with two samples. The delay of the THz pulses and the corresponding resonantly enhanced transmission spectra through the samples are observed. To explain the extraordinary transmission we have treated the samples as Fabry-Perot resonators through resonant excitation of the coupled surface plasmon polaritons filled in the cavities between the metal slats. The experimental results are in reasonable agreement with the numerical simulation. Our results show that THz-time-domain spectroscopy may be an effective technique for studying the optical properties of various THz microstructured devices.     

COIL中稀释气体对单态氧产率影响的实验研究

 利用自发Raman散射光谱对射流式氧发生器的单态氧产率进行了测试，研究了稀释气体对于发生器产率的影响，并分析了造成影响的原因     

双驱动x射线激光等离子体能谱特性研究

用时间积分空间分辨的平晶千电子伏谱仪测量了钽激光等离子体发射波长范围为045— 075nm的软x射线能谱，精确测量和准确辨认出类镍、类钴和类铁离子的共振线及类镍离子 的内壳层跃迁线-对实验结果处理，获得了辐射线谱的强度-通过谱线比率的诊断推断脉冲激 光时差对等离子体状态的影响，至少也可部分解释激光上能级的粒子数及等离子体的 电离程度- 关键词： 离子谱特性 软x线能谱强度 谱线辨认     

急性缺氧条件下EP、CM、CAP以及耳蜗毛细胞的形态学变化

本实验用同一根玻璃微电极在豚鼠耳蜗中阶记录ＥＰ（ＥｎｄｏｃｏｃｈｌｅａｒＰｏｔｅｎｔｉａｌ，耳蜗内电位）、ＣＭ（ＣｏｃｈｌｅａｒＭｉｃｒｏｐｈｏｎｉｃｓ，耳蜗振电压）、ＣＡＰ（ＣｏｍｎｏｕｎｄＡｃｔｉｏｎＰｏｔｅｎｔｉａｌ，复合动作电位），观察在不同缺氧状态下，三者动态变化过程．发现在缺氧初始（１—２分钟），ＣＭ和ＣＡＰ随ＥＰ同步迅速下降；但缺氧３—６分钟时，ＣＭ下降缓慢，似一“平台”，而ＣＡＰ和ＥＰ继续同步下降；缺氧７—１２分钟时，三者又倾于平行。扫描电镜观察：ＩＨＣ（内毛细胞）表面由底四到三圈出现广泛分泌物和球状物，ＯＨＣ汐（毛细胞）表面出现局限性分泌物和球状物，静纤毛融合。结果表明：ＯＨＣ和ＩＨＣ的功能状态与氧代谢密切相关，ＣＭ直接受ＯＨＣ和ＩＨＣ结构变化的影响。ＣＭ下降过程中的平台，则可能与盖膜（ＴＭ）的压电效应有关。ＣＡＰ的变化不完全依赖于ＣＭ。     

短脉冲载荷下金属材料的层裂破坏

 本文用点炮加载聚酯薄膜飞片撞击金属靶材料，飞片速度0.714~2.24 km/s，脉冲宽度40~80 ns，击靶压力为2.280~11.952 GPa。在回收的铝、铜和钢靶样品上观察到层裂现象。通过金相分析发现它们的破坏方式与在一般较长脉冲加载下的破坏方式相似，铝和铜以延性方式破坏；钢则以脆性方式破坏。一维和二维数值模拟结果表明通常的几种层裂判据在这个应力、应变和应变率范围内也基本上适用。     

第二届物理奖简介

 第二届“胡刚复、饶毓泰、叶企孙、吴有训物理奖”评审结果,共有4个项目7名同志光荣获奖.他们是:一 胡刚复物理奖(实验技术)获奖项目:高功率激光物理实验技术的发展获奖人:林尊琪主要贡献:在激光等离子体相互作用和球靶内爆动力学基础研究方面做了大量实验物理技术发展工作,包括:成功建立了国内适用于激光等离子体基础研究的七项先进配套诊断系统,其中多分幅X光背景照明诊断设备是国际首创,为相关联地研究激光内爆球靶两维动力学过程提供了重要技术基础.     

L—Fuzzy群（I）

In this paper,the L-fuzzy group theory in a general frame is established,which is a generalization of [1-4].