Adsorption of Xe in zeolite MCM-22

Adsorption of xenon in zeolite MCM-22, a zeolite containing two separate pore systems，has been investigated in detail by variable temperature (VT) ¹²⁹Xe NMR spectroscopy. NMR results suggest that Xe atoms are preferentially adsorbed in the supercages of the zeolite at low Xe pressure (less than a few atmosphere), while Xe atoms can penetrate into the two-dimensional sinusoidal channels at high Xe pressure. Exchange of xenon at the different adsorption sites in the same supercage, i.e. xenon atoms in the two pockets and those in the central part of the supercage, was confirmed at 145 K by two-dimensional (2D) ¹²⁹Xe NMR exchange spectroscopy. The time scale for the exchange is about several milliseconds.     

FirstIdentificationofLevelSchemesinNeutron─richIsotopes141Xe，152Ceand160Sm

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聚焦超声治疗129/J小鼠外阴上皮内瘤变模型的实验研究

为探讨聚焦超声治疗对小鼠外阴上皮内瘤变的影响,研究治疗前后VEGF表达变化,采用苯甲酸雌二醇注入40只129/J型鼠腹部皮下,7周时建立外阴上皮内瘤变轻到中度不典型增生(Vulvar Interaepithelial Neoplasia,VIN Ⅰ～Ⅱ)小鼠模型.随机分为聚焦超声治疗组和假照组,治疗前后检测皮肤病理及VEGF表达变化.建立VIN Ⅰ～Ⅱ小鼠模型16例.结果显示聚焦超声治疗组7例皮肤基本恢复正常,VEGF表达降低.与假照组相比差异均有统计学意义(P<0.05).由此得出,聚焦超声治疗小鼠外阴内上皮瘤样病变具有无创性、安全性和有效性.     

Molecular dynamics study on the structure Ⅰ xenon hydrate

A 368 water molecule structure Ⅰ gas hydrate encased with 22 xenon molecules have been calculated by molecular dynamical simulations. The potential TIP4P was used for water interactions and Lennard-Jones for Xe-Xe and Xe-water interactions. There is a fiat region and a local mininum between 75.0 and 100 K in the potential energy curve. Glassy phase transition for Xe hydrate is predicted in this region by analyzing anomalous heat capacity, phonon density of states, and radial distribution functions.     

平面型氙准分子灯特性及其在降解水相枣红中的应用

研究了平面型氙准分子灯的真空紫外(VUV)辐射特性,电源电压、频率和充气压强对辐射强度和效率均有影响.研究表明在正弦电压驱动下,充气压3×104Pa左右时有最佳辐射强度和效率.在本实验中用于水处理实验的氙准分子灯参数为电压4kV,频率20kHz,气压3.8×104Pa,对应的辐射功率为25.4mW(光子流量2.2×10-6einstein·min-1).选用偶氮类染料枣红作为被分解物质,发现氙准分子灯的172nm辐射能够有效地使枣红解离,解离反应呈准一级反应,解离速率为9.28×10-8mol·min-1,光量子产额4.2×10-2mol·einstein-1.有机物初始浓度、溶液pH值、光强等都会对解离率产生影响.在氙准分子灯和反应溶液不直接接触时,发现解离率和COD(化学需氧量)去除率并不一直随着光强增加而增大,而有一最佳值.     

^132Xe核的微观sdgIBM—2描述

本文从壳模型组态和核子－核子相互作用出发，借助Ｄｙｓｏｎ玻色子展开，ＭＪＳ代换和适当定义的具体有很强集体性的玻色子。     

n+127 129 135 I反应的理论计算及分析

目的 计算和分析0．01～20MeV的能量范围内n 127 129 135 I反应截面。方法 首先应用微观光学势参数自动调节程序得到一组中子光学势参数，在此基础上对能量在0．01～20MeV的中子入射n 127 129 135 I的反应截面进行理论计算和分析，并与实验数据进行对比。计算与分析基于光学模型、核反应多步过程的半经典理论、激子模型、扭曲波恩近似等核反应理论模型。结果 反应道截面的计算结果与JENDL-3库的计算结果曲线形状及实验数据均符合得很好。结论 理论模型是成功的，并能成为核安全设计的理论依据。     

Molecular dynamics study onthe structure I xenon hydrate

Gas hydrates (GHs) are multi-component crystalline compounds with structures consisting of water molecules and encasing gas molecules[1]. There are three types of natural GHs, called structure I, structure II and structure H.[2]. Simple gases such as methane, xenon (Xe), etc. are hydrophobic and can be trapped into water cages to form structure I GHs[2]. It is found that Xe are present in the samples from hydrate ridge, Cascadia Margin[3]. Xe hy-drate is especially suited for study of X…     

An approach to noble-gas isotopic compositions in natural gases and gas-source tracing in the Ordos Basin, China

Isotopic compositions of noble gases, i.e. He Ar Kr and Xe, are measured in natural gases from the Zhongbu gasfield in the Ordos Basin. And heavy noble-gas isotopes (Kr, Xe) are here first used in geochemically studying natural gases and gas-source correlation. Isotopic compositions of heavy noble gases in natural gases, especially Xe, show two-source mixing in the Zhongbu gasfield. Gas sources are somewhat different in the northeast and the southwest of the gasfield. Generally, the gas source of the Lower Paleozoic makes a greater contribution in the southwest than in the northeast in the field. Two kinds of gases can be differentiated from isotopic compositions of heavy noble gases and from their relation with the Ar isotopic composition, Therefore, the comprehensive study on isotopic compositions of light and heavy noble gases can supply more useful information on gas-source correlation and tracing.