大型玻璃钢渔船帽型骨架剖面参数的力学分析

本文对大型玻璃渔船帽型架剖面参数,进行了在不受力情况下正交各向异性玻璃钢薄板稳定的力学分析,建立架受力分析－受压区的矩形薄板压缩稳定和腹板的矩形薄板剪切稳定两种力学模型,解得这两种力学模型,在两种材料（１：１玻璃钢和４：１玻璃铡）与两种边界件（四边简支和四边固支）组合的四种条件下,骨架剖面参数的ｂ／ｔ１和ｈ／ｔ的取值范围,它们依次为１０．０～２６．２和２８．７～４４．２。文中分析结果为帽型骨架剖面     

Theoretical Investigation of Uniform and Non-uniform Penetrable Sphere Fluid

A bridge function approximation is proposed for a single-component fluid consisting of penetrable sphere interacting via a potential that remains finite and constant for center-center distance smaller than the particle diameter and is zero otherwise. The radial distribution function from the Ornstein-Zernike integral equation combined with the present bridge function approximation is in satisfactory agreement with the corresponding simulation data for all of the investigated state points. The presently calculated excess Helmholtz free energy respectively based on virial route and compressibility route is highly self-consistent, and is in very good agreement with simulational results for the case of low temperatures. The present bridge function approximation, combined with the bridge density functional approximation, can reproduce very accurately density profiles of the penetrable sphere fluid confined in a hard spherical cavity for all the cases where simulational results are available.     

Tokamak中自举电流的剖面准直性

利用Harris模型,通过求解等离子体平衡方程,计算俘获粒子份额,分别对常规剪切和中心负剪切下tokamak中的自举电流的大小和剖面准直性进行了计算和分析.自举电流分布与等离子体平衡电流分布之间的剖面准直性可以通过调整等离子体的密度、温度和电流分布参数,以及描述等离子体形状的拉长度k和三角变形因子d来获得.中心负剪切位形有利于自举电流产生,并有好的剖面准直性.通过计算比较,分别在常规剪切位形下和中心负剪切位形下获得了一组优化的等离子体参数,在这组参数下,自举电流有较大的份额和好的剖面准直性 关键词： tokamak 自举电流 剖面准直性     

PIXE应用于分析Si基片热扩Ni的深度分布

本文报告了PIXE(Proton Induce X-ray Emission)技术分析Si基片热扩Ni的深度剖面,质子能量为0.7至2.5MeV,比较了两种理论计算结果的差异,并与其它测量方法得的结果作了比较。     

南极洲Nelson冰帽排钻冰芯内的火山灰与冰川物质平衡

对采自南极洲南设得兰群岛Nelson冰帽一条断面上三支排钻冰芯内火山灰碎屑物成分进行了研究。根据1967—1970年期间欺骗岛(Deception Island)火山喷发物主要成分资料分析,认为这三层火山灰应属1970年欺骗岛火山喷发后的沉积物。据此可知,过去20年中,Nelson冰帽顶部GW处近年来的平均积累速率为1200g·cm~(-2)·a(-1)。冰帽中部N30处的平均净积累量为700g·cm~(-2)·a(-1),边缘N50处则仅为6g·cm(-2)·a~(-1)。以此次火山灰为标记推知,Nelson冰帽东部的年净积累量高于北部。     

红外光声光谱技术应用于复合膜的原位剖面分析

土壤颗粒在微观尺度上具有明显的异质性,表现为土壤有机质与矿物质的双层复合物结构。本研究以人工制备的复合膜样本为材料,采用红外光声光谱技术和独立成分分析对复合膜样本层进行原位剖面分析。复合膜样本由PE保鲜膜和办公胶带制备,红外光声光谱仪动静速率分别为0.16,0.32和0.64 cm/s。结果表明,通过改变光谱仪动静速率可以原位获取复合膜样本不同深度的组成信息,并估测出PE膜的厚度为5.4~7.6μm,与实际厚度(7±1)μm相接近;同时利用独立成分分析可以直接从复合膜样品的红外光声光谱中,同时分离出PE保鲜膜和胶带的光声光谱特征。红外光声光谱技术可对复合膜进行剖面分析,为进一步研究异质性土壤样本,特别是有机矿质复合体样本提供了新的分析手段。     

Rapid Profiling of Alkaloids in Several Medicinal Herbs by Matrix-assisted Laser Desorption/Ionization Mass Spectrometry

A simple method was developed for rapid and direct profiling of alkaloids in medical herbs via matrix-assisted laser desorption/ionization time-of-flight mass spectrometry(MALDI-TOF MS). The dry herbs were first ground to powder and passed through a stainless steel sieve, mixed with the matrix solution to form a homogeneous suspension, which was then directly applied to MALDI analysis. Several matrices were investigated and 2,5-dihydroxybenzoic acid(DHB) was chosen as the optimized one, and the particle wit...     

河南宝泉抽水蓄能电站近场区断裂活动特征及对兴建电站的稳定性评价

本文通过野外调查和人工地震反射剖面法对河南宝泉抽水蓄能电站近场区内的断裂进行了详细的研究, 结果表明近场区内的断裂活动在晚更新世以来均已停止, 断裂活动将不会影响该电站的稳定性。