Synthesis and Characterization of O,O-Dimethyl-N-(2,2,2-trichloro-1-arylaminoethyl) Phosphoramidothioates

Several novel trichloromethyl-containing O,O-dimethyl phosphoramidothioate derivatives have been synthesized by the reaction of O,O-dimethyl phosphoramidothioate with chloral imines. The latter were prepared in good yields by refluxing the dichloroethane solution of chloral and substituted anilines using 3 Å molecular sieves as dehydrating agent. Structures of title compounds were confirmed by IR, ¹H NMR, ³¹P NMR, and FT-MS studies.     

含氟溴油对多种金属相容性的XPS研究

用ＸＰＳ（Ｘ射线光电子能谱法）对浸泡在氟溴油中的多种金属进行表面测定及深度剖析，研究了该油中氟与溴对金属的腐蚀情况，从而提供制作导航陀螺的合适材料。     

低杂波电流驱动等离子体的电导

本文研究了由于欧姆电场与驱动电流的低杂波场相互作用造成的影响等离子体电导的两个物理机制。重新推导了电子响应方程并求出了低杂波电流驱动场引起的等离子体电导增量。与没有考虑到这两个物理过程的结果相比,电导增量改变了2/(1+D_c)倍。     

Single-parameter expression for ions reflection from surfaces

Based on a detailed analysis of the Boltzmann equation for ion transport in solids, it has been shown that for low-energy ions incident on a heavy element target the distribution function of the ions can be determined by one single parameter, called the scaled transport cross-section, which was defined earlier [1]. This means that the transport quantities of different ion-target-energy combinations should be similar only when their scaled transport cross-section is the same. To test this significant conclusion, we undertook a set of systematic and extensive calculations of reflection coefficients using the improved bipartition model of ion transport. The systematic calculations include 3410 ion-target-energy combinations, namely H, D, T, He, Li, B, C, N, O, Ne ions with energy ranges from 10 eV to 1 MeV normally incident to C, Al, Cu, Mo, Ag, W, Au, Pb, U targets. The only restrictions isM ₁/M ₂<1/6. The calculations verify that particle and energy reflection coefficients present an excellent one-to-one correspondence to the scaled transport cross-section. Furthermore, based on the calculations, universal expressions for both particle reflection coefficients and energy reflection coefficients for normal ion incidence have been obtained by fitting the numerical data. By comparing the results calculated by the universal expressions with experimental and Monte Carlo data, it is shown that the expression can describe reflection coefficients well.     

非正交曲线坐标下三维粘性流动数值分析

本文基于非正交曲线坐标与相应的非正交速度分量下导得的守恒型N—S方程，讨论了求解三维粘性流动的数值方法，计算中显式时间推进算法与Baldwin—Lomax湍流模型被采用，应用本工作发展的程序，作为算例计算了一个沿径向非等截面环形叶栅的三维粘性流场，得到了诸如三维压力分布，总压损失分布以及十分清晰的二次流动图景等丰富的流场信息。     

Design,Synthesis and Fungicidal Activity of Novel Strobilurin-1, 2, 4-Triazole Derivatives Containing Furan or Thiophene Rings

A series of strobilurin-1,2,4-triazole derivatives containing a furan or thiophen ring was designed and synthesized. The structures of the compounds were characterized by ¹H NMR, ¹³C NMR and HRMS spectra. The bi-oassays indicated that the fungicidal activities of compounds 10b(EC₅₀=14.82 mg/L) and 10c(EC₅₀=18.72 mg/L) against Cercospora arachidicola Hori in vitro were much higher than that of Azoxystrobin as control(EC₅₀=40.54 mg/L) and the fungicidal activities of compounds 10u(EC₅₀=8.66 mg/L) and 10n(EC₅₀=9.89 mg/L) against Rhizotonia cerealis in vitro were higher than that of the same control(EC₅₀=10.86 mg/L). Compounds 10b, 10c, 10n and 10k could be considered as the leading compounds for further investigation.     

Research progress on bulk nanobubbles

There are still fundamental problems lying in the basic research of bulk nanobubbles.Are the bulk nanobubbles reported in the literature nano scale bubbles or c...     

基于边缘定向扩散的图像增强方法

针对前向后向扩散方程不能较好的保持流线状结构,而相干增强不能锐化边缘的缺点, 提出一种新的基于边缘定向的张量型前向后向扩散模型.该模型将前向-后向扩散方程引进到张量型扩散方程中,在扩散系数的选取上合并了相干增强扩散与前向-后向扩散的长处,又克服了他们各自的缺点.采用类似相干增强扩散的边缘定向算子实现对边缘的定向,然后根据边缘定向的结果设置扩散张量的特征根,使扩散张量沿边缘方向为正向扩散以增强边缘,而垂直于边缘方向为逆扩散以锐化边缘.理论分析和数值计算表明,该方法具有比相干增强扩散及前向-后向扩散更好的增强效果.     

Ligand‐Promoted Iron(III)‐Catalyzed Hydrofluorination of Alkenes

An iron‐catalyzed hydrofluorination of unactivated alkenes has been developed. The use of a multidentate ligand and the fluorination reagent N‐fluorobenzenesulfonimide (NFSI) proved to be critical for this reaction, which afforded various fluorinated compounds in up to 94 % yield.