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低压下水欠热流动沸腾的两相CFD数值模拟研究
欠热流动沸腾 两流体模型 多相流
2011/8/23
采用两流体(汽相和液相)基本数学模型，结合汽相和液相之间的界面传热、传质和动量交换封闭模型、汽泡平均直径模型、汽泡脱离直径模型、汽泡成核模型、汽泡脱离频率模型、欠热沸腾起始点模型和壁面热流密度分配模型，在CFD软件CFX4.4中采用用户自定义函数将相变引起的传热、传质和动量交换作为源项分别添加到汽相和液相的能量、质量和动量守恒方程中，对低压下内管加热外管绝热的环形通道内的欠热沸腾进行了数值研究，得...
HPuO分子激发态的外场效应
HPuO 激发态 电偶极场 含时密度泛函
2011/8/22
采用密度泛函(DFT)方法B3LYP/Gen，在Pu为相对论有效原子实势(RECP)基组水平上，优化计算得到了分子轴方向不同电偶极场（－0.005～0.005 a.u.）作用下的HPuO的基态几何结构、偶极矩和分子总能量。在优化构型下，用同样的基组，采用含时密度泛函(TDDFT)方法(TD-B3LYP)，研究了同样外电场条件下对HPuO的激发能的影响。计算结果表明，在外场作用下，对HPuO的前5个...
卢瑟福散射及其计算机模拟
卢瑟福散射 散射截面 计算机模拟
2011/8/22
对卢瑟福背散射分析技术中出现散射截面偏离的物理现象进行了研究，并用计算机模拟计算方法对卢瑟福散射进行模拟计算。模拟计算结果表明：卢瑟福散射公式的小角发散由靶原子间互不遮掩的条件不能满足造成，在厚度小到没有遮掩且不发生大量多次散射的情况下，模拟计算结果与卢瑟福散射公式计算的结果一致。
Autoionization of He atoms induced by partially stripped ion impact
autoionization post-collisional interactions rainbow scattering
2010/6/30
A study of the autoionization process induced by partially stripped ion impact is performed. The Barrachina-Macek model is extended to the case in which the projectile-emitted electron interaction is ...
UV dominant optical emission newly detected from radioisotopes and XRF sources
Radioisotopes XRF sources Optical emission Atomic spectra Atomic phenomenon Solar EUV
2010/6/30
The current paper reports first and definite experimental evidence for g-, X-, or b radiation causing UV dominant optical radiation from (1) radiochemicals such as 131I; (2) XRF sources such as Rb XRF...
蛋白三态去折叠自由能计算新方法
蛋白质稳定性 三态模型 Y79W-W83F 解折叠
2013/9/9
基于三态模型中的传统假设, 三态解折叠蛋白的解折叠过程可以看作是一个连续而独立的两个两态过程. 本文提出一种新的三态解折叠蛋白去折叠自由能计算新方法, 且将该方法用于计算三态解折叠蛋白Y79W-W83F-Cu的去折叠自由能. 数据分析表明, 用该方法求得的蛋白去折叠自由能较用先前报道的方法更精确.
Periodic spin textures in a degenerate F=1 $^{87}$Rb spinor Bose gas
Periodic spin textures degenerate F=1 $^{87}$Rb spinor Bose gas
2010/4/13
We report on the spin textures produced by cooling unmagnetized $^{87}$Rb F=1 spinor gases into the regime of quantum degeneracy. At low temperatures, magnetized textures form that break translational...
Proton Decay: Improving the sensitivity through nuclear dynamics?
nuclear dynamics Proton Decay
2010/3/16
The kinematics of the decay of a bound proton is governed by the proton spectral function. We evaluate this quantity in 16O using the information from nuclear physics experiments. It also includes a c...
Atomic Ionization by keV-scale Pseudoscalar Dark Matter Particles
Atomic Ionization keV-scale Pseudoscalar Dark Matter Particles
2010/3/16
Using the relativistic Hartree-Fock approximation, we calculate the rates of atomic ionization by absorption of pseudoscalar particles in the mass range from 10 to $\sim$ 50 keV. We present numerical ...
室内222Rn/220Rn子体平衡因子的初步测量
222Rn及其子体 220Rn及其子体 平衡因子
2011/8/22
为了测量222Rn/220Rn子体水平及其与222Rn/220Rn浓度之间的平衡关系，采用连续测氡仪和氡钍子体连续监测仪，选择包头地区几种典型居室和工作场所，对其空气中222Rn/220Rn及其子体浓度进行测量。结果显示，工作场所和居室中222Rn平衡因子均值分别为0.35和0.43，工作场所和居室距墙壁20 cm处220Rn平衡因子均为0.030；室内220Rn平衡当量浓度昼夜变化与222Rn类...
干凝胶法制备空心玻璃微球的炉内成球过程分析
干凝胶法 空心玻璃微球 惯性约束聚变 靶制备
2011/8/22
基于干凝胶粒子炉内成球过程的分解实验结果及各阶段中间产物的分析测试结果，通过对干凝胶法制备空心玻璃微球工艺的传热、传质和运动的过程分析，将干凝胶法制备空心玻璃微球炉内成球过程合理简化为吸热、封装、气泡形成及聚并、精炼、冷却5个阶段。吸热阶段的升温速率以及发泡剂的分解温度和发泡效率、精炼阶段的精炼时间和温度、冷却阶段的冷却速率是影响干凝胶法制备空心玻璃微球工艺和空心玻璃微球最终质量的关键因素。
Independent Control of Scattering Lengths in Multicomponent Quantum Gases
Independent Control of Scattering Lengths Multicomponent Quantum Gases
2010/4/12
We develop a method of simultaneous and independent control of different scattering lengths in ultracold multicomponent atomic gases, such as $ \mathrm{40}}$K or $^{\mathrm{40}} $K-$^{\mathrm{6}}$Li m...
A Comparison between Channel Selections in Heavy Ion Reactions
Yrast states Fusion-evaporation Deep-inelastic Channel selections Heavy ion reactions
2010/7/5
The gamma rays de-exciting the yrast and near yrast states in neutron deficient as well as neutron rich nuclei from fusion-evaporation and deep-inelastic reactions and other emission particles have be...