Polarization-dependent supercontinuum generation from light filaments in air

We investigate polarization-dependent properties of the supercontinuum emission generated from filaments produced by intense femtosecond laser pulses propagating through air over a long distance. The conversion efficiency from the 800-nm fundamental to white light is observed to be higher for circular polarization than for linear polarization when the laser intensity exceeds the threshold of the breakdown of air.     

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。     

替罗非班在老年STEMI患者PCI治疗中的作用

目的 观察小剂量替罗非班在老年急性ST段抬高型心肌梗死(STEMI)急诊经皮冠状动脉介入（PCI）术中的治疗效果, 并探讨其临床安全性。方法 选取急性STEMI并行急诊PCI治疗的老年患者150 例,使用随机数字表法分为替罗非班组（80 例）和对照组（70例）,两组患者术前均予以阿司匹林300mg 及氯吡格雷300mg顿服,术后长期服用阿司匹林100mg、氯吡格雷75mg,1 次/d,替罗非班组在常规治疗基础上给予替罗非班负荷量（5μg/kg）在3min内静脉推注后以0.075μg/（kg·min）静脉滴注维持24h。观察两组手术前后梗死相关动脉TIMI血流情况、术后心电图相关导联抬高的ST 段回落幅度、住院期间出血及继发血小板减少症等事件发生率、术后3个月左心室射血分数（LVEF）及主要不良心血管事件（MACE）发生情况。结果 PCI术后,替罗非班组TIMI 血流2～3 级者75例（93.75%）,ST 段回落幅度为（69.96±15.53）%,均显著高于对照组的58 例（82.86%）和（64.18±14.02）%,差异均有统计学意义（均P＜0.05）;住院期间替罗非班组出血事件发生6例（7.5%）,低于对照组（P＜0.05）,而血小板减少情况未见明显增多（P＞0.05）。3个月随访结果显示,替罗非班组LVEF改善情况显著优于对照组（P＜0.01）,而MACE 发生率则降低（P＜0.05）。结论 小剂量替罗非班能有效提高老年急性STEMI患者PCI术后冠状动脉血流灌注,且不增加出血及血小板减少的风险,同时可改善心功能、降低MACE的发生。     

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.     

2-[4-(5-取代-1,3,4-噁二唑-2-基)苯氧基]丙酸/乙酸酯的合成、结构及其生物活性

以4-氰基苯酚和2-氯丙酸乙酯(或2-氯乙酸甲酯)为起始原料进行反应,得到2-(4-(1H-四唑-5-基)苯氧基)丙酸/乙酸酯,进而发生Huisgen反应合成了一系列新型1,3,4-噁二唑类标题化合物,其结构经~1H NMR,~(13)C NMR,IR,MS及元素分析或高分辨质谱得到表征和确认.用X射线衍射测定了化合物3q的晶体结构.初步生物活性测试结果表明,含有较小体积取代基的噁二唑化合物3c和3d在200μg/mL测试浓度下对水稻KARI酶分别具有94.5%和83.1%的抑制活性.化合物3p在100μg/mL浓度下对双子叶油菜(Brassica campestris)胚根生长抑制率可达82.4%.     

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。     

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.     

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...