GaAs极化电子源激活的yo-yo过程研究

通过对GaAs晶体产生极化电子束流的实验过程研究,着重对yo-yo过程中不同的实验参数对产生极化束流以及束流稳定情况的影响进行了分析,为获得稳定而持久的极化电流提供了有力的实验支持,并讨论了极化电流强度的可控性. 关键词： GaAs晶体 极化电子束 yo-yo过程 激活     

综合计算题的解法举例

化学综合计算所涉及的基本知识。学生一般都是掌握的。即知识水平和智力素质均能达到正确解题的程度。但不少学生由于解题方法陈旧、思路单一。使一些本来可以很简捷、甚至不经计算就可以得到答案的题目。往往还要花费很多时间。绕很多弯子才能使问题得以解决。     

重离子物理实验数据在线获取及处理系统开始研制

在重离子核物理研究领域中,随着加速器能量的提高和实验技术的发展,测量的参量和数据采集量越来越多,一般核反应实验同时测量的参数达40—50个,而在束γ实验则多达数百个,一轮实验采集的数据多达亿计。为完成大数据量、高数据率、多参量的同时获取以及实验过程的实时监测,必须配备以电子计算机为中心的容量大、速度快、具有图象处理功能的在线数据获取系统。     

连苯三酚缩二乙烯基苯树脂活性醚化物的合成与成像应用

通过乙烯基乙醚和连苯三酚缩二乙烯基苯树脂( PDVB resin)的羟基加成,合成了具有缩醛结构的活性醚化物,并对该活性醚化物的合成条件进行优化.这种具有缩醛结构的活性醚化物具有常温酸解和热解性能,作为阻溶促溶剂可用于常温化学增幅阳图感光成像和阳图热敏成像中.用于阳图热敏CTP感热成像配方中,使得版材具有高感度、高抗碱性、高稳定性;用于阳图CTcP感光成像配方中,使得该版材的综合成像性能优良;用于正性光致抗蚀剂成像配方中,使得该正性光致抗蚀剂具有高感度和高分辨率.     

简易电子天平的制作

在人教版教材《选修3—2》第六章第二节中介绍了一些常见传感器,其中就有电子秤．但是这里提到的主要原理是压力使得应变片发生形变,从而引起一个电压差,由于应变片的形变量与压力是一个比较复杂的对应关系,学生只能定性地分析其传感原理．笔者一直在思考能不能制作一个传感器,能够定量地研究其传感原理,从而凸显知识的应用性．于是想到了传统的电磁力平衡原理的电子天平,它用到的大多数原理都属于中学物理的内容．     

A <Emphasis Type="Italic">VU</Emphasis>-decomposition method for a second-order cone programming problem

A vu-decomposition method for solving a second-order cone problem is presented in this paper. It is first transformed into a nonlinear programming problem. Then, the structure of the Clarke subdifferential corresponding to the penalty function and some results of itsvu-decomposition are given. Under a certain condition, a twice continuously differentiable trajectory is computed to produce a second-order expansion of the objective function. A conceptual algorithm for solving this problem with a superlinear convergence rate is given.     

C/O γ能谱测井新的解析理论和方法

报道了快中子非弹性散射γ能谱测井(C/O γ能谱测井)新的解析理论和方法, 也就是由C/O能谱测井仪在井眼中获取地层的快中子非弹性散射γ射线、 NaI(Tl)探测器测量得到的256道谱, 再由实测非弹谱确定地层中主要元素C, O, Si, Ca和Fe等对非弹γ谱的贡献分额, 利用同一地层F因子相同, 求出C产额与O产额比, C的百分含量与O的百分含量和原子含量比, 及Ca和Si相应比值.A new analyzing theory and method of C/O spectrometry logging is reported. Fast neutron enelastic scattering γ ray spectra(256 channels) were acquired in borehole by NaI(Tl) detector. The enelastic scattering γ ray from major elements C, O, Si, Ca, Fe, etc. have the fractions of mixed enelastic spectrum in formation respectively. Because F factor is the same for identical formation, then the ratio of yield of C to O, the ratio of weight percent of C to O, and the ratio of atoms C to O could be found, and the corresponding ratio of Ca to Si was found.     

Study on optical electron polarimeter and measurement of the relative Stokes parameters of weak light

In this paper, we present the research on an optical electron polarimeter, which is used to determine the polarization of an incident electron beam by measuring the relative Stokes parameters of the fluorescence emitted from the He gas following the impact excitation with the electron beam. The fundamental theory of the optical electron polarimeter is discussed with the 3³P→2³S transition of He. The structure and performance of the instrument are described, which are different in some aspects from previous works. The arrangement of the experiment for measuring the relative Stokes parameters of linearly polarized weak light is also investigated, which actually involves the same processes as the polarization measurement with the incident electron beam. The results obtained are in agreement with the theoretical prediction.     

用于固体自锁模的三元腔激光器的二阶、三阶色散的解析表示

给出在任意角度切割情况下,三元腔固体自锁模激光器二阶、三阶色散的解析表示,并系统地计算了切割角度、材料等因素的变化对二阶、三阶色散的影响.该计算为三元腔固体自锁模激光器的设计提供了理论依据. 关键词： 三元腔 二阶色散 三阶色散