周期性波导结构半导体光电探测器及制作方法

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光上下路分插复用器件

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具有自动调节功能的光学衰减器模块

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光电子器件和自对准模斑转换器集成的选区外延方法

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半导体材料电信号测试装置

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静电力场下高流速气固两相分离的研究

静电除尘器具有除尘效率高、设备阻力低，耗能少等优点，在工业领域得到广泛应用。但其烟气流速低，投资高、占地大的缺点在一定程度上限制了它的进一步应用。本文分析静电场中颗粒荷电及运动特性，讨论在静电场中高气流流速下的两相分离规律，期望为静电除尘器在降低投资方面的研究探索一些新思路。本文利用气体电离理论，对电晕电离现象进行了分析；利用电子碰撞电离理论，计算了电晕区的大小。通过计算，分析了粉尘在放电场中的荷电特性。对除尘器内的两相流的运动特性进行了数值模拟，分析了静电除尘器中的气流流速分布以及收尘电压、粉尘粒径、荷电场强和气流流速对驱进速度的影响并进行了公式拟合。通过实验，分析了提高烟气流速的情况下，随着荷电电压、除尘电压和收尘长度的改变，截面内粉尘浓度的变化规律。

双奇核~(172)Re高自旋态转动带结构实验研究

利用重离子熔合蒸发反应 14 9Sm (2 7Al,4nγ) 172 Re布居了形变双奇核 172 Re的高自旋态 ,用 12套带有BGO反康普顿抑制的高纯锗探测器阵列进行了在束γ实验测量 ,首次建立了形变双奇核172 Re由 3个转动带构成的高自旋态能级纲图 .研究和讨论了 3个转动带的结构特征 ,基于已有的高自旋态核结构知识并通过系统学比较和分析指出它们的准粒子组态分别为πh11 2 νi13 2 ,πh9 2 νi13 2 和π1 2 -[5 41] ν1 2 -[5 2 1].发现前两个转动带在自旋小于 18.5时其转动能级呈现反常的旋称劈裂 .

同位旋非对称核物质性质与扩展的BHF方法(Ⅴ)三体核力对质子和中子单粒子势的影响

在扩展的同位旋相关的Brueckner Hartree Fock理论框架内 ,研究了三体核力对同位旋非对称核物质中质子与中子的单粒子势及其同位旋依赖性的影响 .

高电荷态同质异能态的寿命(英文)

分析了带电原子由于缺少内转换 (同质异能态 )或电子俘获跃迁 (β衰变 )引起的核寿命的变化 .理论预言了随着电荷态的增加 ,内壳的电子在核表面的电子密度降低 ,内壳电子能级也降低 ,不稳定原子核的寿命由于前一原因而缓慢增加 ,但当内壳电子能级降到特殊能量时产生剧烈增加 .比较了由于不同的跃迁能量和跃迁类型对内转换过程的半衰期的影响 ,并将计算的理论值与一些实验测量值进行了比对 .并开发了进行这类计算的公共计算程序 .

束流线性耦合效应的初步研究

在储存环的束流传输系统中 ,斜四极场和纵向螺线管场是引起束流线性耦合的主要原因 .由于这种耦合 ,使得束流的幅度和发射度发生交换 ,引起束流横向包络的增大 ,严重的将造成束流损失 .从Betatron运动方程出发研究了斜四极场和螺线管场存在时束流的幅度耦合效应 ,分析了斜四极场存在时束流发射度的变化 .

An electroosmotic pump for packed capillary liquid chromatography

An electroosmotic pump (EOP) capable of generating pressure above 3 MPa and mul/min flow rate with reverse phase mobile phases of HPLC was constructed and evaluated. The pump consisted of three parallel connected fused silica capillary columns (25 cm x 320 mum I.D.) packed with 2 mum silica materials, hollow electrodes, a high voltage DC power supply, and. a liquid pressure transducer. The EOP was applied in a capillary liquid chromatographic system for mobile phase delivery instead of a mechanical pump. Standard samples containing thiourea, naphthalene, anthracene, phenanthrene and acetonitrile were separated on a 15 cm x 320 mum I.D. 5 mum Chromasil C-18 packed capillary column with acetonitrile/water as mobile phase. (C) 2003 Elsevier Science B.V. All rights reserved.

长白山区天然更新赤松幼树的构型分析

在长白山区东北部天然赤松林内 ,针对赤松幼树 (树高 4～ 5m)探讨了构型与微小生境的关系 ,统计分析了幼树的分枝格局 ,并与生长在林中空地的赤松幼树 (树高 4～ 5m)的构型进行了比较。结果表明 :同林中空地的个体相比 ,林隙内赤松幼树冠幅相对狭窄 ,侧枝的分枝角在树干上从下到上缓慢减少 ;林隙内赤松个体树干上侧枝的平均分枝数比林中空地的少 11% ,侧枝上二级枝条的平均分枝数则比林中空地的赤松个体少 5 % ;当林隙面积在 10 0～ 12 0m2 时 ,侧枝上发生的二级侧枝在不同方位上的分布不均匀 ,在东南 -西 (SE4 5°～SW90°)方位上二级枝条数量分布相对较多

Golden-rule treatment on the ClO/ClO+ electron-transfer system

The structures, properties and electron transfer reactivity of the ClO/ClO+ coupling system are studied in this paper at ab initio (HF and MP2) levels and the density functional theory (DFT: B3LYP, B3P86, B3PW91) levels employing 6311 + G(3df) basis set and on the basis of the golden-rule of the time-dependent perturbation theory. Investigations indicate that the results got from the B3LYP method employing 6-311 + G(3df) basis set is in excellent agreement with the experiment. The activation energies, the stabilization energies and the electronic coupling matrix elements have also been calculated by using the B3LYP/6-311 + G(3df) method, and then the electron transfer rates are determined at this level. The electronic coupling matrix element of EC.6 is very small, only 0.03 kcal/mol, while that of EC.7 is the biggest, being 12.41 kcal/mol, the corresponding electron transfer rate is also the fastest among these seven encounter complexes. The averaged electron transfer rate is about 1.672 X 10(11) M-1 s(-1). It is indicated that the structures optimized by B3LYP method are more reliable than the results got from the other four methods. It also testified that the electronic coupling matrix element is the vital factor that significantly affects the electron transfer rate. (C) 2003 Elsevier B.V. All rights reserved.

Autler-townes splitting in the multiphoton resonance ionization spectrum of molecules produced by ultrashort laser pulses

We report for the first time the proper conditions to observe Autler-Townes splitting (ac-Stark splitting) from vibrationally coherent states belonging to the different electronic terms of a diatomic molecule. Wave packet dynamics simulations demonstrate that such a process is feasible by multiphoton resonance ionization of the molecule Na-2 with a single ultrashort intense laser pulse. With the ultrahigh time resolution of a femtosecond laser pulse, one can directly measure the absolute value of the transition dipole moment between any kinds of molecular states by this kind of Autler-Townes splitting, which is a function of the internuclear distance R.

Membrane cartridges for endotoxin removal from interferon preparations

The suitability of membrane cartridges for the removal of endotoxin from both distilled water and interferon preparations was examined. The endotoxin concentrations were reduced to 4.0 and 7.3 EU/ml, respectively, when about 4000 ml of distilled water with 20 and 28 EU/ml were passed through the deoxycholate and chitosan immobilized membrane cartridges. When 200 ml of interferon preparation with endotoxin concentration more than 80 EU/ml and pH 3.9 were applied to a deoxycholate immobilized membrane cartridge at a flow-rate of 9 ml/min, the endotoxin concentration was reduced to less than 10 EU/ml. However, if an interferon preparation of 450 ml, with more than 80 EU/ml of endotoxin and pH 3.9 was applied to the chitosan immobilized membrane cartridge at a flow-rate of 18 ml/min, the endotoxin concentration was reduced to less than 10 EU/ml. (C) 2003 Elsevier Science B.V. All rights reserved.