排序方式: 共有31条查询结果,搜索用时 31 毫秒
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对限制在两个光滑的疏水板间的水进行了分子动力学模拟,观察到了两种晶体结构,都满足冰规则.在1GPa的压强和1.0nm的板间距下获得的新的冰相是平坦的六边形-四边形三层冰.在此结构中,靠近板的两层(外层)中的水分子形成六边形环,中间层的水分子形成四边形环.对于外层的水分子,其四个氢键中的三个在同一层中,另一个氢键与中间层连接.对于中间层的水分子,四个氢键中的两个在同。层中,而另外两个氢键与两个不同的外层相连.虽然三层的形状不同,但其面密度却接近相等.另一种结构是在0.8nm的板问距和100MPa的侧向压下获得的平坦的六边形双层冰.模拟中的相变既有一阶相变,也有连续相变. 相似文献
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对限制在两个光滑的疏水板间的水进行了分子动力学模拟,观察到了两种晶体结构,都满足冰规则. 在1 GPa的压强和1.0 nm的板间距下获得的新的冰相是平坦的六边形-四边形三层冰. 在此结构中,靠近板的两层(外层)中的水分子形成六边形环,中间层的水分子形成四边形环. 对于外层的水分子,其四个氢键中的三个在同一层中,另一个氢键与中间层连接. 对于中间层的水分子,四个氢键中的两个在同一层中,而另外两个氢键与两个不同的外层相连. 虽然三层的形状不同,但其面密度却接近相等. 另一种结构是在0.8 nm的板间距和100 相似文献
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Optical Emission Spectroscopy Investigation of a Surface Dielectric Barrier Discharge Plasma Aerodynamic Actuator 下载免费PDF全文
The optical emission spectroscopy of a surface dielectric barrier discharge plasma aerodynamic actuator is investigated with different electrode configurations, applied voltages and driving frequencies. The rotational temperature of N2 (C^3 Ⅱu) molecule is calculated according to its rotational emission band near 380.5 nm. The average electron energy of the discharge is evaluated by emission intensity ratio of first negative system to second positive system of N2. The rotational temperature is sensitive to the inner space of an electrode pair. The average electron energy shows insensitivity to the applied voltage, the driving frequency and the electrode configuration. 相似文献
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The prompt fission neutron spectra for the neutron-induced fission of 233U for low energy neutrons (below 6 MeV) are calculated using nuclear evaporation theory with a semi-empirical method, in which the partition of the total excitation energy between the fission fragments for the nth+233U fission reactions is determined by the available experimental and evaluation data. The calculated prompt fission neutron spectra agree well with the experimental data. The proportions of high-energy neutrons of prompt fission neutron spectrum versus incident neutron energies are investigated with the theoretical spectra, and the results are consistent with the systematics. The semi-empirical method could be a useful tool for the prompt evaluation of fission neutron spectra. 相似文献
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N-甲基咪唑固载化离子交换树脂对砷的吸附分离 总被引:2,自引:0,他引:2
研究了N-甲基咪唑阴离子交换树脂(RCl)对水中As(Ⅴ)的吸附。RCl有较高的热稳定性和化学稳定性,并且可适用于较宽的酸度范围(pH 1~12)。RCl可去除水中低浓度的As(Ⅴ)。树脂和As(Ⅴ)发生阴离子交换反应,此反应在60 min时快速达到平衡,为了保证吸附反应更完全,所有吸附实验均进行2 h。吸附数据符合Langmuir吸附等温方程,RCl对As(Ⅴ)的最大吸附容量为67.2 mg/g。随着温度的升高,吸附率逐渐增大,表明此阴离子交换反应是吸热反应。对负载As?的RCl树脂用0.1 mol/L HCl进行解吸附,解吸附率达到99.46%,树脂可以再生并且重复利用。 相似文献
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牛奶α-乳白蛋白基因实时荧光定量PCR检测方法的建立 总被引:1,自引:0,他引:1
采用Taqman探针技术,建立食品中牛奶过敏原α-乳白蛋白基因的实时荧光定量PCR检测方法。根据α-乳白蛋白基因序列设计特异性引物及Taqman探针进行PCR扩增,构建质粒,经酶切鉴定测序后,建立拷贝数(copies)-Ct标准曲线。成功克隆α-乳白蛋白目的基因,建立的标准曲线在1.12×103~1.12×108 copies范围内线性关系良好,灵敏度高,液体样品检测限达到1 000copies/mL,特异性强,稳定性好。该法可用于实际商品中牛奶过敏原α-乳白蛋白组分的定量检测。 相似文献
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In this paper we report on an experimental study of the characteristics of nanosecond pulsed discharge plasma aerodynamic actuation. The N 2 (C 3 Π u ) rotational and vibrational temperatures are around 430 K and 0.24 eV, respectively. The emission intensity ratio between the first negative system and the second positive system of N 2 , as a rough indicator of the temporally and spatially averaged electron energy, has a minor dependence on applied voltage amplitude. The induced flow direction is not parallel, but vertical to the dielectric layer surface, as shown by measurements of body force, velocity, and vorticity. Nanosecond discharge plasma aerodynamic actuation is effective in airfoil flow separation control at freestream speeds up to 100 m/s. 相似文献