概率论教学中值得注意的几个问题

<正> 概率论是中专学校唯一的一门研究随机现象统计规律的数学课程。由于随机现象的不确定性,使得学生在学习概率论的过程中,往往感到对某些概念、公式理解不透,从而解题时就不那么得心应手。本文是自己在概率论教学中的一点体会。     

用反射椭圆偏振光谱获得波长调制反射谱

文章分析了波长调制反射谱的实质是静态介电函数对能量的一级微商谱．将ＭＯＣＶＤ方法生长的ＧａＩｎＰ以及掺Ｓｉ两个样品，用椭偏光谱法测量得到可见光区的介电函数谱，并求其一级微商谱．将用于分析电反射谱的三点法推广用来分析介电函数的一级微商谱，得到波长调制反射谱的实验结果，并与介电函数谱的结果加以比较，使灵敏度和分辨率有很大提高．     

陆森红盐阴离子[Fen_2S_2(No)_4]~(2-)红外光谱的归属

本文报导陆森红盐阴离子简正坐标分析及计算所得的一套力常数。由这套力常数所得的红外光谱波数的计算值与观察值吻合良好,加权平方偏差之和为0.223。根据对称内坐标和力常数的位能分布计算,进行了阴离子的红外光谱的归属。     

Multiparty Quantum Remote Secret Conference

We present two schemes for multiparty quantum remote secret conference in which each legitimate conferee can read out securely the secret message announced by another, but a vicious eavesdropper can get nothing about it. The first one is based on the same key shared efficiently and securely by all the parties with Greenberger-Horne- Zeilinger （GHZ） states, and each conferee sends his secret message to the others with one-time pad crypto-system. The other one is based on quantum encryption with a quantum key~ a sequence of GHZ states shared among all the conferees and used repeatedly after confirming their security. Both these schemes are optimal as their intrinsic efficiency for qubits approaches the maximal value.     

L~1空间中弱奇性积分方程特征值的数值解法探究

在L¹空间中讨论弱奇性积分方程的特征值问题,给出了一种算法,证明所提出算法的合理性,并举出具体算例,通过Matlab编程算出所给算例的近似数值解.     

标准差准则下的最优再保险

本文关注的是在标准差准则下如何进行再保险, 使得保险公司和再保险公司的风险波动达到最小. 在容许合约类范围内得到了建立最优再保险合约的充分条件. 如果再保险公司的风险小于一个给定阈值, 我们找到了使保险公司的风险最小的最优再保险合约. 在这里, 保险公司可以采取三种最一般且有效的风险措施.     

A study of hadronic shower development in the ECAL of the alpha magnetic spectrometer Ⅱ

In this paper, we studied the development of hadronic shower in an electromagnetic calorimeter of Alpha Magnetic Spectrometer Ⅱ. Two parametrized empirical formulae were proposed to describe the hadronic shower shape in calorimeter. Using 100 GeV proton beam incident on the center of the ECAL, detailed plots of lateral and longitudinal hadronic shower behavior were given and we found the formulae can describe the development of the hadronic shower with the test beam data. The possible application of the parametrized formulae including e^±-π^± discrimination and tau jet reconstruction was discussed.     

分散固相萃取-气相色谱-串联质谱法测定蔬菜中多环芳烃及卤代多环芳烃

建立了同时检测蔬菜中16种多环芳烃(PAHs)和11种卤代多环芳烃(X-PAHs)污染水平的分散固相萃取-气相色谱-串联质谱(GC-MS/MS)分析方法。样品中的多环芳烃和卤代多环芳烃经正己烷提取,N-丙基乙二胺吸附剂(PSA)和十八烷基键合硅胶吸附剂(C18)分散固相萃取净化剂净化,气相色谱-串联质谱方法测定,外标法定量。16种PAHs和11种X-PAHs在50,100和200μg/kg添加浓度下的回收率为74.7%～115.1%,相对标准偏差为1.6%～15.3%,方法检出限为0.03～7.4μg/kg。     

In-plane optical anisotropy of two-dimensional VOCl single crystal with weak interlayer interaction

Transition-metal oxyhalides $MOX$ ($M = {\rm Fe}$, Cr, V; $O ={\rm oxygen}$, $X= {\rm F}$, Cl, Br, I), an emerging type of two-dimensional (2D) van der Waals materials, have been both theoretically and experimentally demonstrated to possess unique electronic and magnetic properties. However, the intrinsic in-plane anisotropic properties of 2D VOCl still lacks in-depth research, especially optical anisotropy. Herein, a systematic Raman spectroscopic study is performed on VOCl single-crystal with different incident laser polarization at various temperatures. The polarized-dependent Raman scattering spectra reveal that the ${{ A}}_{{\rm g}}$ mode of VOCl show a 2-lobed shape in parallel polarization configuration while a 4-lobed shape in vertical configuration. In addition, the temperature-dependent and thickness-dependent Raman scattering spectra confirm a relatively weak van der Waals interaction between each layers among VOCl single crystal. These findings might provide better understanding on the in-plane anisotropic phenomenon in VOCl layers, thus will accelate further application of 2D single crystals for nanoscale angle-dependent optoelectronics.