Sc^＋18离子1s^23d-1s^2nf的跃迁能和偶极振子强度

用全实加关联方法计算了类锂Sc^＋18离子1s^23d-1s^2nf（4≤n≤9）的跃迁能和1s^2nf（n≤9）态的精细结构，依据量子亏损理论确定了该Rydberg系列的量子数亏损，用这些作为能量的缓变函数的量子亏损。可以实现对任意高激发态（n≥10）的能量可靠的预言，利用在计算能量过程中确定的波函数，计算了Sc^＋18离子1s^23d-1s^2nf的偶极跃迁在三种规范下振子强度；将这些分立态振子强度与量子亏损理论相结合，得到在电离阚附近束缚态，束缚态跃迁振子强度以及束缚态．连续态跌迁振子强度密度，从而将Sc^＋18离子的这一重要光谱特性的理论预言外推到整个能域。     

A New Type of Terahertz Waveguides

A new type of THz waveguides, which employs a solid polyethylene rod as the core and polyethylene tubes in a periodic array of square lattice as the cladding, is proposed. Optical properties of this new THz waveguide, especially in dispersion, confinement loss and single mode property, are investigated in detail with the plane wave expansion method and the beam propagation method. Numerical results demonstrate that the new THz waveguide can reach not only low dispersion but also low confinement loss at single mode propagation. Therefore, the square lattice structure is a better candidate as THz waveguides than the triangular ones.     

浅谈变电站常见故障及快速处理

电力设备和电力系统,在运行中常常会发生各种故障。正确及时地处理,是变电站调试维护人员一项重要的基本职责和技能。     

Effects of Substrate Temperature on Helium Content and Microstructure of Nanocrystalline Titanium Films

Helium-charged nanocrystalline titanium films have been deposited by HeAr magnetron co-sputtering. The effects of substrate temperature on the helium content and microstructure of the nanocrystalline titanium films have been studied. The results indicate that helium atoms with a high concentration are evenly incorporated in the deposited titanium films. When the substrate temperature increases from 60℃ to 350℃ while the other deposition＇parameters are fixed, the helium content decreases gradually from 38.6 at.% to 9.2at.%, which proves that nanocrystalline Ti films have a great helium storage capacity. The 20 angle of the Bragg peak of （002） crystal planes of the He-charged Ti film shifts to a lower angle and that of （100） crystal plane is unchanged as compared with that of the pure Ti film, which indicates that the lattice parameter c increases and a keeps at the primitive value. The grain refining and helium damage result in the diffraction peak broadening.     

理科(18)题别解

试题如图3,在直三棱柱ABC-A1B1C1中,底面是等腰直角三角形,∠ACB=90°,侧棱AA1=2,D、E分别是CC1与A1B的中点,点E在平面ABD上的射影是△ABD的重心G.     

环前列腺素和凝血(口恶)烷在心血管疾病中的临床应用

一、缺血性心脏病与前列腺素、凝血(口恶)烷(thrombaxane)缺血性心脏病的发病及加重与动脉硬化、血栓形成和冠状动脉痉挛的关系是十分重要的。所以具有强血管扩张作用和血小板凝集抑制作用的环前列腺素和相反的具有强血管收缩作用及血小板凝集作用的凝血(口恶)烷 A_(TXA_2)两种物质与缺血性心脏病的关系已引人重     

副品红共振光散射法测定脱氧核糖核酸

本文基于脱氧核糖核酸 (DNA)对有机染料副品红的共振光散射的增强效应 ,拟定了一种测定DNA的共振光散射法。在pH =0 5～ 1 5范围内 ,有机染料副品红于 35 5nm处的共振光散射强度被DNA强烈增强 ,且增强程度与DNA浓度呈线性关系 ,线性范围为 0 10～ 15 μg·mL- 1 ,检出限可达 36ng·mL- 1 。该方法简便、快速、具有较高的灵敏度和准确度 ,且线性范围较宽。将该方法用于混合样品中DNA的测定 ,结果令人满意。