爆磁压缩发生器初级紧凑型电脉冲源设计及实验

设计了一种爆磁压缩发生器(FCG)初级紧凑型电脉冲源,分析了电脉冲源组成、工作原理及最佳输出时序模型。采用爆炸驱动滑块型放电开关方案,实验测试了开关高压下闭合放电性能。电脉冲源体积132 mm200 mm,质量12.5 kg,工作电压5 kV,初始储能约750 J,充电时间不大于30 s;静态馈电FCG(42 H,78 m),输出电流峰值不小于5.4 kA,输出能量不小于600 J;动态馈电FCG,时序控制误差不大于5 s,耦合电流值不小于5.2 kA,耦合能量不小于550 J;电脉冲源有效储能密度不小于200 mJ/cm3,能量传递效率不小于75%。     

大型上翻式拱形钢闸门流固耦合静动力特性分析研究

论文通过三维空间有限元数值计算模型研究大型上翻式拱形钢闸门的流固耦合动力特性,取得闸门结构流固耦合条件下的振动模态参数,为闸门结构共振分析和采取合理的控振措施提供了科学依据.此外对控制结构强度和刚度的门顶溢流工况进行了闸门位移和应力分布分析,指出了存在问题和修改方向.论文成果可供类似工程设计时参考.     

无机纳米粒子表面引发接枝聚合

无机纳米粒子表面引发聚合反应是无机纳米粒子—有机聚合物杂化复合材料制备的一种重要途径。分子自组装技术的发展使得各种类型的聚合反应都有转移至无机纳米粒子表面进行的可能。本文综述了表面引发聚合反应用于制备高键合密度的聚合物接技无机纳米粒子的研究进展。     

水稻耐铁毒基因型筛选及边缘细胞对铁毒的反应特性

以相对耐铁的水稻品种"中优9288"和敏感品种"汕优10号"作为实验材料,研究了铁毒对水稻离体边缘细胞的影响。结果表明,随铁浓度的升高(除400μmol/LFe2 外),处理时间的延长,边缘细胞存活率下降:400μmol/L浓度铁处理时,边缘细胞存活率增加;低浓度铁能促进PME活性增长,高浓度铁则抑制PME活性。     

模糊决策分析在电子政务中的应用

电子政务系统中,信息量庞大.主要讨论了模糊决策分析理论在电子政务中的应用.分析了在实际应用过程中,不同参数的取值,对数据产生怎样的影响,以及如何对人才的取舍作出决策.     

免分析光栅一次曝光相位衬度成像方法

X射线光栅微分相位衬度成像技术可以观察到常规吸收衬度成像难以分辨的弱吸收物质的精细结构信息,因而在医学、材料学等研究领域具有巨大的应用前景.但传统的X射线光栅微分相位衬度成像技术由于采用分析光栅作为空间滤波器,需要采用相位步进法扫描分析光栅来获得样品的多张投影图像才能够分离出样品的吸收、折射和散射信息,因此存在样品曝光...     

State space solution to 3D multilayered elastic soils based on order reduction method

Starting with the governing equations in terms of displacements of 3D elastic media, the solutions to displacement components and their first derivatives are obtained by the application of a double Fourier transform and an order reduction method based on the Cayley-Hamilton theorem. Combining the solutions and the constitutive equations which connect the displacements and stresses, the transfer matrix of a single soil layer is acquired. Then, the state space solution to multilayered elastic soils is further obtained by introducing the boundary conditions and continuity conditions between adjacent soil layers. The numerical analysis based on the present theory is carried out, and the vertical displacements of multilayered foundation with a weak and a hard underlying stratums are compared and discussed.     

Generation of an isolated sub-100 attosecond pulse in the water-window spectral region

We propose a scheme to generate isolated attosecond pulses in the water-window spectral region. Based on the numerical solutions of the single active electron model, we investigate high-order harmonic generation in helium atoms driven by a multi-cycle two-colour optical field synthesized by an intense 2000 nm, 20 fs pulse and its frequency-doubled pulse. When the latter is slightly detuned and properly phase shifted with respect to the fundamental laser pulse, an ultra-broad extreme ultraviolet supercontinuum with a spectral width of 130~eV can be generated in the 270--400~eV spectral regions. A supercontinuum from 280--340~eV in the water window can be selected to yield an isolated 67 attosecond pulse without employing any phase compensation. This water window coherent x-ray pulse with less than 100 attosecond duration is a potential tool for studying the ultrafast electronic dynamics of biological samples in water.     

Development of a new atmospheric pressure cold plasma jet generator and application in sterilization

This paper reports that a new plasma generator at atmospheric pressure, which is composed of two homocentric cylindrical all-metal tubes, successfully generates a cold plasma jet. The inside tube electrode is connected to ground, the outside tube electrode is connected to a high-voltage power supply, and a dielectric layer is covered on the outside tube electrode. When the reactor is operated by low-frequency (6 kHz--20 kHz) AC supply in atmospheric pressure and argon is steadily fed as a discharge gas through inside tube electrode, a cold plasma jet is blown out into air and the plasma gas temperature is only 25--30℃. The electric character of the discharge is studied by using digital real-time oscilloscope (TDS 200-Series), and the discharge is capacitive. Preliminary results are presented on the decontamination of E.colis bacteria and Bacillus subtilis bacteria by this plasma jet, and an optical emission analysis of the plasma jet is presented in this paper. The ozone concentration generated by the plasma jet is 1.0×10¹⁶cm^-3 which is acquired by using the ultraviolet absorption spectroscopy.     

纳米金属-偶氮染料共掺杂复合膜的制备与吸收蓝移现象

为了达到高密度存储, 关键而有效的方法是获得更短波长的光存储材料. 报道了具有纳米金属-偶氮染料包覆共掺杂结构复合材料的制备及光吸收蓝移现象. 实验发现, 在这种独特结构的复合膜中, 具有存储功能的偶氮染料甲基橙的最大吸收波长比其单独存在于复合膜中蓝移约23 nm, 复合膜的热稳定性提高. 用TEM, SPM, UV-vis, TGA对样品的物理特性进行了表征. 描述了包覆结构的模型, 分析了波长蓝移的机理. 研究结果表明, 具有这种结构的甲基橙有望成为与蓝紫光半导体激光器(GaN)匹配的新一代光存储材料.