原 子 光 刻

介绍了根据量子光学的最新成果——激光冷却和捕陷中性原子的原理而发展出的一种新型纳米级刻印技术——原子光刻.介绍了该项技术的基本原理、总体方案、单元技术及刻印结果,将这项新技术与其他微刻印方法进行了比较,展望了其应用于微电子学等领域的前景. 关键词：     

自旋玻璃锰氧化物La0.67Ca0.33(Mn,Fe)O3中的分步磁化和超大磁电阻

在Mn位替代钙钛石氧化物La_0.67Ca_0.33(Mn,Fe)O₃中观察到分步磁化现象,并在临界场附近获得大于10⁴%的超大磁电阻效应.指出自旋玻璃相中反铁磁团簇在外磁场下的熔化是分步磁化的物理起因.     

空气/油水乳状液泡状流/弹状流流型及其转换的研究

本文采用空气／油水乳状液为介质,在不同含水率下,得到垂直上升管内W／O和O／W状态下泡状流及弹状流的流型特征、用压降脉动法判别流型的判据,同时研究了含水率对流型转换的影响,并建立了流型转换的预测模型,模型计算值与实验结果符合良好。     

二极管失效和烧毁阈值与电磁波参数关系

 利用半导体PN结器件一维模拟程序mPND1D,计算了二极管在不同电磁脉冲电压源条件下的失效和烧毁时器件吸收的能量,并对结果作了初步分析。     

黑腔端置靶辐照不均匀性分析

提供一种解析方法来研究激光加热黑腔所产生的平面辐射场的不均匀度与平面靶大小和位置的关系,解析结果与数值模拟结果进行了比较,两者的曲线形状基本一致,辐照不均匀度最小值的位置也是一致的。并用此方法给出了能产生有最小辐照不均匀度的平面辐射场的腔靶尺寸的范围。     

速度调制光谱技术在等离子体诊断中的应用

采用速度调制分子离子激光光谱技术,通过对CO+彗尾带系(A2Π-X2Σ+)(2,3)带转动光谱强度分布和谱线线宽的测量,不仅获得了CO+的转动温度,还获得了离子的漂移速度、迁移率、正柱区电场、热温度等等离子体参量,同时还测量得到速度调制的调制度为0372±0119. 关键词：     

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The water-cooled model of the toroidal field coils was established calculated according to the heat conduction and the convective heat transfer equation. The results show that the thermal contact resistance and the electrical contact resistance of the interface between the finger joint and the copper plate had a larger effect on the temperature rise of the finger joint. At maximum current of 140kA and the current flattop 7s, the maximum temperature rise of the toroidal coils with the finger joint was below 40??, so the maximum temperature of the coils wouldn’t exceed 80??, and the temperature of the toroidal field was below 30?? after an interval of 15min. However, at maximum current of 190kA, the current flattop time was determined by the thermal contact resistance, the electrical contact resistance and initial temperature.     

1.0 MeV电子碰撞引起Ta 和Au 内壳电离截面的测量

无论对深入理解电子-原子的作用机制,还是在材料等领域的实际应用,电子轰击原子的内壳电离截面都具有重要意义。当前电子碰撞引起原子内壳电离的实验数据多集中在几十keV 入射能量和中小Z 靶原子,其它数据相对比较缺乏。本工作以能量为1.0 MeV电子轰击Ta 和Au 靶,通过测量靶原子特征X射线的产额,获得其K壳电离截面分别为13.3 和10.1 b,L 壳电离截面分别为554 和338 b。并将实验结果和相应的理论进行了对比,结果显示,本实验测得的K壳电离截面与Casnati、Hombourger 理论值、L 壳电离截面与Scoeld和Born-Bethe 的理论值相符。Accurate experimental data for atomic inner-shell ionization cross-sections by electrons are of basic importance both in understanding inelastic electron-atom interaction and its application. Up to now, most of available data on this process were mainly concentrated on the low and medium Z atoms by the bombardment of low energy electrons. In present experiments K-shell and L-shell ionization cross-sections of Ta and Au in collisions with 1.0 MeV eleltron were determined by measuring the characteristic X-rays emitted from the target atoms. For the present collision systems the K-shell ionization cross-sections were found to be 13.3 and 10.1 b,and the L-shell ionization cross sections were 554 and 338 b, respectively. The measured K-shell ionization cross sections are in reasonable agreement with the theoretic predictions of Casnati and Hombourger, while L-shell ionization cross sections are consistent with the theoretical results of Soc eld and Born-Bethey.     

叶栅全三维粘性反问题的数值解

本文发展了一种解叶栅全三维粘性反问题的新的数值方法.基于非正交曲线坐标与相应的非正交速度分量下完全守恒型的Navier－Stokes方程,全三维反问题规定叶片表面的无量纲压力分布反求叶型。计算中叶片表面的边界条件采用一种特殊的方式来处理，即一方面强加给定的压力分布条件,另方面叶面的几何位置在迭代过程中又是可移动的，其移动速度将与Navier—Stokes方程在当地的解联系起来，从而形成一种解定常问题的新的不定常过程.试算证明了本文方法的可行性。     

Wavefunction and Glueball Masses in QCD:the Three-Dimensional Case

We try to develop a possibly more efficient way for extracting the wavefunction and spectroscopy of pure QCD from discretized Hamiltonian field theory. By further exploring the eigenvalue equation method for solving the Schrödinger equation, we find that within thb approach a more suitable choice of the glueball operators can lead to significantly much better results, therefore more rapid convergence to the continuum limit. This is nicely demonstrated in the three-dimensional example.