MIP中一些非金属元素发射谱线特性的研究：Ⅱ.HeMIP中Cl,…

要用超声雾化进样，水冷凝及浓Ｈ２ＳＯ４吸收相结合的去溶方法对Ｃｌ，Ｂｒ，Ｉ，Ｓ和Ｐ等五种非金属元素在ＨｅＭＩＰ中的发射谱线特性进行了研究，获得了各元素在２００－６００ｎｍ范围内较详细的谱图，并求得了各谱线的相对发射强度，得到了一些未见于文献报道的结果。     

发射光谱法测定二氧化锆中钙,镁,铝,铁,钛,铪,硅

本文介绍了用碳酸钡作缓冲剂测定二氧化锆中Ｍｇ，Ｆｅ，Ａｌ，Ｃａ，Ｔｉ，Ｈｆ，Ｓｉ杂质元素的发射光谱方法。该方法直接压样于普通电极中，简便，快速。取得了满意的结果。     

中低合金钢中五害元素（Pb,Sn,As,Sb,Bi）的光电光谱分析…

应用日本岛津ＰＤＡ－５０１７真空发射光谱仪，测定了中低低合金钢中的五害元素，对分析条件进行了选择和确定，并讨论了分析结果和影响因素。本方法具有操作简便，分析速度快，准确度高，成本低等优点，在炉前快速分析与石油管材 取得较好的效果。     

高Z元素辐射不透明度

基于Ｈａｒｔｒｅｅ－Ｆｏｃｋ－Ｓｌａｔｅｒ自洽场平均原子模型，计算了中等及重Ｚ元素的辐射不透明度，并将计算值与其它理论值及实验值进行了比较。     

低含量多元素物质的快速全反射X荧光分析

本文介绍了用全反射Ｘ荧光分析仪对样品量很少、元素含量很氏，多元素溶液的分析，测定了从含量最多的Ｎａ（２４３μｇ／ｍＬ）到含量最少的Ｃｕ（０．０６μｇ／ｍＬ）的１２种元素，同时也介绍了用累加法的多次快速测量以及逐差法处理数据以减少测量误差。     

金属铝中杂质元素的测定及其基体影响的研讨

提出了一种能同时测定金属铝中杂质元素Ｃｕ＇Ｍｎ，Ｍｇ，Ｚｎ，Ｃｒ，Ｎｉ，Ｖ，Ｔｉ，Ｆｅ，Ｓ的ＩＣＰ－ＡＥＳ分析方法，实验考察了金属铝基体，共存元素、不同溶剂等因素驿分析元素测试结果的影响，选择了仪器最佳工作条件。结果表明，当金属铝基体的纯度为９６．００％－９９．９０％时，分析元素的回收率在９５－１０５．０５之间。相对标准偏差ＲＳＤ均小于０．５％。在金属铝进出口商品检验中已获得满意的结果。     

多元素石墨炉光谱测定方法的实际问题

多元素石墨炉光谱测定方法的实际问题Ｗ．Ｓｃｈｒａｄｅｒ，Ｉ．Ｌ．Ｓｃｈｕｔｔｌｅｒ，Ｇ．ＳｃｈｌｅｍｍｅｒａｎｄＦ．Ｐｏｒｔａｌａ德国Ｐ－Ｅ有限公司博登湖厂，邮箱１０１７６１，Ｄ－８８６４７，乌布林根，德国１５年来，随着制造厂家和用户对石墨炉测试设备...     

镍电解液中主要成分和微量成分的ICP—AES测定

本文报告了镍电解中主要成分和微量成分的电感耦合等离子体测定方法，该法简便，快速，可满意地测定试样中Ｆｅ，Ｃｕ，Ｃａ，Ｍｇ，Ｎｉ的浓度。     

晶格不具备五度及六度以上对称轴的证明

对传统的证明晶格不存在五度及六度以上对称轴的方法提出异议，并提供了另一种证明方法。     

ICP—AES法同时测定麦饭石中的多种元素

本文阐述了用ＨＣｌ，、ＨＣｌＯ４及ＨＦ在高压溶样哭喊 内消化麦饭石，应用ＩＣＰ－ＡＥＳ法同时测定麦饭石中的１４种元素。本法的准确度及精密度均达到满意结果。方法简便，快速。     

EFFECTS OF NON-CONSERVATIVE FORCES ON LIE SYMMETRIES AND CONSERVED QUANTITIES OF A LAGRANGE SYSTEM

Non-conservative forces are exerted on a Lagrange system. Their effects on Lie symmetries, structure equation and conserved quantities of the system are studied. It can be seen that some Lie symmetries disappear and some new Lie symmetries emerge. Under certain conditions, some Lie symmetries will still remain present.     

Modeling opinion interactions in a BBS community

This paper is devoted to apply agent based models to real opinion interactions in a bulletin board system (BBS) community. By analyzing a real BBS community, we reveal some empirical features of opinion interactions on the Web. Then, we propose a simple opinion model that bears both general characteristics of traditional opinion models, and some real interacting rules on the Web. The model simulates a group of agents representing Web users participating to a discussion. Simulation results show some dynamical regimes consistent with empirical facts, and offer some possible explanations for the emergence of some real features. Our work implies the possibility of building simple agent based models to simulate computer-mediated interactions on the Web.     

Complete spacelike hypersurfaces in orthogonally splitted spacetimes

We provide some “half-space theorems” for spacelike complete non-compact hypersurfaces into orthogonally splitted spacetimes. In particular we generalize some recent work of Rubio and Salamanca on maximal spacelike compact hypersurfaces. Beside compactness, we also relax some of their curvature assumptions and even consider the case of nonconstant mean curvature bounded from above. The analytic tools used in various arguments are based on some forms of the weak maximum principle.     

宇宙线对地球气候的影响

对宇宙线影响地球气候的一些观测结果和物理机制的研究进行了总结和概述,主要讨论了宇宙线对大气中化学反应、云形成过程等的影响,并给出了羊八井宇宙线观测站对宇宙线流强和大气参量日变化的初步观测结果．     

Molecular bases of thermophily in hyperthermophiles

I reflect on some of our studies on the hyperthermophilic archaeon, Thermococcus kodakarensis KOD1 and its enzymes. The strain can grow at temperatures up to 100 °C, and also represents one of the simplest forms of life. As expected, all enzymes, DNA, RNA, cytoplasmic membrane, and cytoplasmic solute displayed remarkable thermostability, and we have determined some of the basic principles that govern this feature. To our delight, many of the enzymes exhibited unique biochemical properties and novel structures not found in mesophilic proteins. Here, I will focus on some enzymes whose three-dimensional structures are characteristic of thermostable enzymes. I will also add some examples on the stabilization of DNA, RNA, cytoplasmic membrane, and cytoplasmic solute.     

大气压力对激光辐照双层板接触传热的影响

考虑激光辐照下结构变形对双层板接触传热影响可以更真实地反映两板间的传热情况，通过实验和数值模拟分析了大气压力对接触传热的影响。结果表明:大气压力对接触热阻影响非常明显，当大气压力超过一定值后，双层板界面始终接触，后板中心的温升阶段成类抛物形状；当大气压力在某一范围内，大气压力与温度矩产生的靶板挠度相当，接触面时分时合，后板的温升阶段成振荡式类线性增加；当大气压力小于某一特定值时，后板温度有一突跃过程，通过适当的设计有可能观测到该现象。     

一维准周期晶格的性质及应用

准周期晶格在冷原子领域被广泛研究,它使得人们可以在一维或者二维系统里研究扩展到安德森局域的转变. 2008年, Inguscio研究组在冷原子系统里制备了一维准周期晶格,并观测到了安德森局域化现象,这极大地推动了准周期系统的理论和实验研究.后来, Bloch研究组在制备的一维和二维准周期晶格中都观测到了多体局域的现象.最近,他们还在准周期晶格中成功观测到迁移率边以及存在迁移率边的系统的多体局域现象.这些冷原子实验推动了多体局域以及迁移率边等方向的研究.准周期晶格已经成为一个平台,它对很多物理现象的影响正在被广泛研究,并可以尝试在冷原子实验中观测到这种影响.本文结合作者的一些相关工作,对一维准周期晶格一些近期的研究进行了简要综述,介绍了一些相关的重要的冷原子实验,讨论了准周期晶格的一些重要性质,以及它对一些物理现象(比如拓扑态)的影响.     

THz-Time Domain Spectroscopy system for applications to radical detection

In this paper, we present some preliminary results on a new terahertz-Time Domain Spectroscopy (THz-TDS) experiment. After a general introduction about the interest of the THz range, we particularly discuss some advantages of this technique for combustion applications and compare it with the classical linear and nonlinear optical techniques. The set-up developed in our laboratory is described and some results on NO displayed.     

一类基于混沌映射构造Hash函数方法的碰撞缺陷

混沌动力学系统在一定的参数范围内出现混沌运动，且它所产生的混沌序列具有良好的伪随机特性.以混沌映射为基础，已有文献提出了一些构造单向散列函数的方法.对这些方法进行分析，证明它们均存在碰撞缺陷，并总结了采用混沌映射构造单向散列函数时应注意的问题. 关键词： 混沌 单向散列函数 碰撞     

On Solution of the Integrable Initial Boundary Value Problem for KdV Equation on the Semi-axis

This paper is concerned with the Korteweg-de Vries (KdV) equation on the right semi-axis. The initial boundary value problem with inhomogeneous integrable boundary conditions is studied. We show that, under some conditions on the initial data the problem has a solution and provide the procedure for constructing this solution. The procedure is based on the inverse spectral method and consists of several steps reducing to either solving some linear problems or calculations via some explicit formulas.