First-Principle Calculations for Elastic and Thermodynamic Properties of Diamond

The elastic constants and thermodynamic properties of diamond are investigated by using the CRYSTAL03 program. The lattice parameters, the bulk modulus, the heat capacity, the Grüneisen parameter, and the Debye temperature are obtained. The results are in good agreement with the available experimental and theoretical data. Moreover, the relationship between V/V₀ and pressure, the elastic constants underhigh pressure are successfully obtained. Especially, the elastic constants of diamond under high pressure are firstly obtained theoretically. At the same time, the variations of the thermal expansion α with pressure P and temperature T are obtained systematically in the ranges of 0-870 GPa and 0-1600 K.     

乳浊液进样—火焰原子吸收光谱法测定润滑油中锌铅

将样品的苯溶液用乳化剂OP乳化成乳浊液 ,取适量样品乳浊液配制成试液 ,喷入火焰 ,以氯化石蜡乳浊液作参比 ,用标准加入法测定。建立了测定润滑油中锌和铅的FAAS方法。对乳化剂的选择、背景吸收干扰、参比溶液的配制及检出限进行了考察。测定结果与灰化法 火焰原子吸收光谱法一致 ,相对误差小于± 3.0 %。方法简便、快速、准确。在火焰原子吸收光谱法中 ,用乳浊液进样技术取代灰化法处理样品是可行的     

Quantum Tunneling Radiation of Reissner-Nordström de Sitter Black Hole with a Global Monopole

Applying Parikh's quantum tunneling model, we study the quantum tunneling radiation of Reissner-Nordström de Sitter black hole with a global monopole. The result shows that the tunneling rates at the event horizon and the cosmic horizon are related to Bekenstein-Hawking entropy if we take the energy conservation into consideration, and the true radiate spectrum is not precisely thermal.     

X光分幅相机在黑腔等离子体填充特性研究中的应用

在神光Ⅱ装置上2.4 ns长脉冲三倍频激光（激光能量8×300 J）与腔靶耦合实验研究中,X光分幅相机通过激光注入孔观测获得了3种腔尺寸腔内Au等离子体径向运动时空分辨图像。用MATLAB对图像进行了定量处理,结合时间分辨辐射温度测量结果分析表明：在腔内不充气、无低Z衬垫情况下,标准腔（800 μm×1 350 μm）在激光脉冲作用到约1.5 ns时出现明显的Au等离子体堵腔效应;当腔尺寸放大到1.25倍（1 000 μm×1 800 μm）和1.5倍（1 200 μm×2 100 μm）时,腔内等离子体基本不堵腔。给出了3种腔尺寸不同时期腔内Au等离子体径向聚心速度,分析表明：大腔的聚心速度比小腔的慢,后期比初期慢。     

高功率微波在低电离层中的互作用效应分析

高功率微波在低电离层中传输时会产生非线性效应。分析了低电离层中HPM的互作用效应,推导了HPM在低电离层中传输的互作用因子同初始场强和微波频率的关系,并对不同条件下振幅交调深度同两个脉冲的延迟时间之间的关系进行了理论研究与数值模拟。结果表明：改变脉冲的延迟时间,振幅交调深度的变化规律也随之改变;为了减少吸收衰减,低电离层中传输的HPM电波的干扰波电场初始振幅与特征等离子体电场振幅的比值应保持在10以下。     

撕裂模准线性增长分析

发现经典的电阻撕裂模准线性理论在磁岛增长的分析上存在着定性的近似,克服这一近似,得到了新的磁岛准线性演化的解析表达式,结果表明,岛宽的增长为w～t^1/2而不是经典理论的w～t,对一般Tokamak等离子体参量,岛宽的增长率远大于Rutherford增长率,而饱和岛宽小于前人理论的结果.     

A Novel Method for the Synthesis of High Hindered Iminoesters by the Reaction of Decomposition of Phenyldiazoacetate in the Presence of Rh2(OAc)4 with Arylamines and DEAD

It is well known that iminoesters were condensed by ketoesters with amines, but the procedure to ketoesters require harsh reaction conditions and multi steps. Herein we report a mild and practical one-step approach for the synthesis of iminoesters, especially for the high steric hindered iminoesters. Decomposition of phenyl diazoacetate catalyzed by rhodium acetate with amines to give N-H insertion product has been reported.     

低硒克山病病区和非病区居民红细胞免疫功能的对比测定

对比测定了低硒克山病病区和非病区居民的红细胞免疫功能、血清红细胞免疫粘附调节因子和血硒含量。结果表明，低硒病区和非病区居民红细胞Ｃ３ｂＲ花环率和血硒水平显著低于对照非病区，而血清红细胞免疫粘附花环抑制率显著高于对照非病区；３组居民的红细胞免疫复合物花环率和血清红细胞免疫粘附花环促进率无明显差异；低硒病区和非病区居民上述各参数值均相似。研究说明，克山病病区居民红细胞免疫功能低下和血清红细胞免疫粘附抑     

固态多环芳烃化合物的THz时域光谱研究

利用太赫兹时域光谱技术室温下对芳烃化合物萘、联苯、葸、α-萘酚和β-萘酚在3-73cm^-1(0．1．2．2THz)频谱范围内进行了光谱测量。结果表明，多环芳烃化合物在此波段有不同的吸收特征。不能形成氢键的萘、联苯和蒽在67cm^-1(2．0THz)附近均有一吸收峰，这可能是由于分子之间的振动即晶格振动所引起的；而能够形成氢键的口一萘酚和卢．萘酚，其吸收峰可归结于分子间氢键的相互作用所引起的集体振动模式。1Hz时域光谱不仅能够鉴别分子结构存在微小差别的化合物而且还能鉴别同分异构体。     

Deblocking of Dithianes with Diacetoxyiodobenzene

A facile method for deblocking of dithianes is described. Diacetoxyiodobenzene was used as a cheaper variant of bis(trifluoroacetoxy)iodobenzene for the regeneration of carbonyl compounds from dithianes.