原始数据中束流相关本底的分离

束流相关本底处理的不确定性是在BES/BEPC上进行R值测量的主要误差来源之一,提出从原始数据中分离出束流相关样本的新方法, 并把此样本用于调节强子产生器LUARLW的参数,以减小强子探测效率的系统误差, 提高R值的测量精度.     

射流式单重态氧发生器的气液两相耦合模型

 将气液两相耦合模型应用于射流式单重态氧发生器，通过数值模拟和实验的比较验证了该模型的可行性。分析了发生器工作参数对其动力学过程的影响，发现在保持其它参数不变的情况下，氯气和BHP溶液的相对浓度决定了发生器动力学过程的类型。给出了利用氯气吸收速率变化曲线判定发生器动力学过程类型的方法。在原有模型基础上考虑了热效应及其对模型参数的影响，计算了水蒸气的含量。模型改进后，模拟结果更接近于实验值。     

大面积均匀电子束产生实验研究

 在电子束泵浦气体激光实验中，大面积均匀电子束是获得高效能激光输出的必要条件。介绍了利用SPG-200脉冲功率源产生大面积均匀电子束的实验。SPG-200是基于SOS的全固态重复频率脉冲功率源，其开路电压大于350 kV。用于产生电子束的真空二极管阴极长294 mm，宽24 mm，两端均为半径为12 mm的半圆，栅网平面为阳极面，两者之间的距离在0~49 mm可调，阴极发射的电子束通过用于隔离激光气室和二极管真空室的压力膜及其支撑栅网引出。分别以石墨和天鹅绒为阴极材料，获得了大面积电子束输出，给出了二极管参数的测量结果，并对电子束发射均匀性进行了诊断。实验结果表明：在阴极材料为石墨、阴阳极间隙为5~9 mm时，二极管电压为240~280 kV，二极管电流为0.7~1.8 kA，输出的电子束很不均匀；在阴极材料为天鹅绒、阴阳极间隙为31~46 mm时，二极管电压为200~250 kV，二极管电流为1.5~1.7 kA，输出的电子束均匀性较好。     

R值测量中强子事例选择的改进

强子事例的选择和强子探测效率是在BEPC/BES上进行R值测量的两项主要误差来源. 过去实验只选取等于或者大于2叉的强子事例, 因而0叉和1叉事例的丢失将导致强子事例数和强子探测效率的较大误差. 试图提出在R值测量中选取包含1叉强子事例在内的样本, 这将有助于更合理地调节强子事例产生器LUARLW的参数, 减小强子探测效率和R值测量的系统误差.     

二十面体群C-G系数计算

本文简要介绍了计算Ｃ Ｇ系数的生群元矩阵方程法，给出计算二十面体群Ｃ Ｇ系数时采用的简化计算方法，并给出了Ⅰ群Ｃ Ｇ系数的计算结果。     

On goodness-of-fit tests for multiple recursive random number generators

This paper considers the problem of reducing the computational time in testing uniformity for a full period multiple recursive generator (MRG). If a sequence of random numbers generated by a MRG is divided into even number of segments, say 2s, then the multinomial goodness-of-fit tests and the empirical distribution function goodness-of-fit tests calculated from the ith segment are the same as those of the (s + i)th segment. The equivalence properties of the goodness-of-fit test statistics for a MRG and its associated reverse and additive inverse MRGs are also discussed.     

Multipoint parallel excitation and CCD-based imaging system for high-throughput fluorescence detection of biochip micro-arrays

We report the development and the characterization of a multipoint parallel excitation and CCD-based imaging system for high-throughput fluorescence detection of biochip micro-arrays. A two-dimensional array of (19×19) points with uniform intensity distribution, generated by a holographic array generator, was used for parallel excitation of two-dimensional micro-arrays of fluorescence samples. A CCD-based imaging system was used for high-throughput parallel detection and quantitative analysis of the fluorescence output. Micro-array samples of cyanine (Cy5) dye dots on silicon wafers and on glass substrates with varying concentration were used to evaluate the performance of the system. Results of fluorescence intensity measurements with varying concentration of dye and with different image acquisition time are presented. We have demonstrated that this novel approach will, in general, outperform the conventional approach in the excitation efficiency, the signal-to-noise ratio, and the throughput. The limitations and the potential improvements of the present method are discussed.     

一类四元环上常循环码是自由码的充要条件

本文研究了环F2 uF2上的奇长度的循环码和(1 u)-循环码.运用代数方法,得到了F2 uF2上的循环码和(1 u)-循环码成为自由码的几个充要条件.推广了Bonnecaze(1999)和Aydin(2002)的关于自由码的结果.     

利用爆聚等离子体研究X光激光

对脉冲功率技术驱动的爆聚等离子体过程进行了物理分析,在5％的偏差范围内,得到了和数值计算结果相一致的近似解析公式。计算结果表明,功率在3—4TW,输出电能300—400KJ,技术指标类似PITHON的加速器可以使质量为200—400μg的Kr气爆聚压缩成高温等离子体柱。