Pb_n微团簇(n=20～30)及铅晶体表面过程的计算机模拟

基于Murrell等提出的有效正体加三体展开势能函数对铅微团簇Pbn (n =2～ 3 0 )的结构及面心立方晶体铅的表面行为进行了计算机模拟。发现Pbn 微团簇的结构衍生规律为 :依次增加一个三配位的表面原子 ,分子表面为三元环所覆盖 ,整个分子为畸变的四面体的密堆积 ;f (c)铅晶体的表面层原子间内压缩最为严重 (最大达 8% ) ,从第三层开始层间距的伸缩率已经很小 ( <1 % )。     

Pbn微团簇(n=20～30)及铅晶体表面过程的计算机模拟

基于Ｍｕｒｒｅｌｌ等提出的有效正体加三体展开势能函数取铅微团簇ｐｂｎ（ｎ＝２～３０）的结构及面心立体表面心立方晶体铅的表面进行也计算机模拟。发现ｐｂｎ微团簇的结构衍生规律为：依次增加一个配位的表面原子,分子表面原子,分子表面为三元环所覆盖,整个分子为畸变的四面体的密堆积：ｆ（ｃ）铅晶体的表面层原子间内压缩最为严重（最大达８％）,从第三层开始层间距的伸缩率已经很小（〈１％）。     

QDENSITY—A Mathematica Quantum Computer simulation

This Mathematica 5.2 package¹ is a simulation of a Quantum Computer. The program provides a modular, instructive approach for generating the basic elements that make up a quantum circuit. The main emphasis is on using the density matrix, although an approach using state vectors is also implemented in the package. The package commands are defined in Qdensity.m which contains the tools needed in quantum circuits, e.g., multiqubit kets, projectors, gates, etc. Selected examples of the basic commands are presented here and a tutorial notebook, Tutorial.nb is provided with the package (available on our website) that serves as a full guide to the package. Finally, application is made to a variety of relevant cases, including Teleportation, Quantum Fourier transform, Grover's search and Shor's algorithm, in separate notebooks: QFT.nb, Teleportation.nb, Grover.nb and Shor.nb where each algorithm is explained in detail. Finally, two examples of the construction and manipulation of cluster states, which are part of “one way computing” ideas, are included as an additional tool in the notebook Cluster.nb. A Mathematica palette containing most commands in QDENSITY is also included: QDENSpalette.nb.

Program summary

Title of program: QDENSITYCatalogue identifier: ADXH_v1_0Program summary URL:http://cpc.cs.qub.ac.uk/summaries/ADXH_v1_0Program available from: CPC Program Library, Queen's University of Belfast, N. IrelandOperating systems: Any which supports Mathematica; tested under Microsoft Windows XP, Macintosh OS X, and Linux FC4Programming language used: Mathematica 5.2No. of bytes in distributed program, including test data, etc.: 180 581No. of lines in distributed program, including test data, etc.: 19 382Distribution format: tar.gzMethod of solution: A Mathematica package is provided which contains commands to create and analyze quantum circuits. Several Mathematica notebooks containing relevant examples: Teleportation, Shor's Algorithm and Grover's search are explained in detail. A tutorial, Tutorial.nb is also enclosed.     

广西镇龙山金（银）矿的构造控制特征

本文阐述了广西镇龙山金（银）矿化集中区内主要断裂构造的基本特征,并指出,其中规模较大的,与矿化关系较密切的主要是近ＥＷ向,次为近ＳＮ向断裂,它们组合成线状,交叉状和放射状断裂带,并严格控制着区内岩浆岩、矿化带、矿脉、矿体和“富矿包“的空间展布。这对找矿评价和预测盲矿体都具有实际意义。     

用流体静力学称量法测定黄金饰品中金的含量

本文研究了用流体静力学称量法，通过测定密度计算金饰品中金的含量，该法简单实用，设备投产少，能满足用户日常检定的需要。该法克服了“试金石”法检定黄金的粗糙性，又解决了电子探针在测试过程中，可能对材料成人偏析所造成的误差。     

勘查砂金的最新技术KJ法

本文介绍了朝鲜民主主义人民共和国金策工业大学金致崇教授发明的根据磁场调查勘查砂金的最新技术(简称KJ法)。这项技术是不用钻探和井探,而只用仪器探出砂金的矿体形状、大小、埋深及品位。     

基于光源调制技术的金标试纸条定量分析仪器

基于光电检测原理,研发了一套可用于金标免疫试纸条定量检测的分析仪器。采用绿光发光二极管(LED)作为发射光源,以光电二极管接收试纸条反射光,并通过步进电机带动检测系统扫描试纸条待检区域。系统采用光源信号的调制与接收信号的解调技术,以消除环境干扰噪声。实验结果表明,该仪器检测结果准确,与真实值之间误差<1%;稳定性高,变异系数CV<2%。     

Satisfying quality requirements in the design of a partition‐based,distributed stock trading system

Although quality requirements (QRs) have become a major drive in today's software development, there have been very few real‐world examples in the literature that demonstrate how to meet these requirements. This paper presents such an example. Specifically, the paper describes the design of a partition‐based distributed stock trading service system that satisfies a set of QRs related to resource utilization, performance, scalability and availability. The paper evaluates this design through detailed experiments and discusses some design alternatives and the lessons learned. Central to this design are a static load distribution strategy and a dynamic load balancing strategy. The first strategy is to achieve an initial balanced workload on the system's server cluster during the system initialization time, whereas the second strategy is to maintain this balanced workload throughout the system execution time. Together, these two strategies work in unison to ensure that the server resources are efficiently utilized; the user requests are processed with the required speed; the application is partitioned with sufficient room to scale; and the system is highly available. Copyright © 2011 John Wiley & Sons, Ltd.     

高原寒冷区地球电化学方法寻找隐伏金矿对比试验

为了解高原寒冷景观区隐伏金矿地电化学异常特征,选取辛曲矿区和扎家同哪矿区进行对比试验。结果表明,两个矿区的地电提取Au含量均较低,且多为难以连片的狭窄异常,但矿体的分布基本限定在地电化学综合异常范围内。两个矿区有不同的异常特征：产出较陡的辛曲金矿异常多呈狭窄的单峰,峰值与矿体头部相对应;而产出较缓的扎家同哪金矿,异常呈多峰异常形态,在矿头对应部位有异常峰,且异常沿矿体倾斜方向呈阶梯式变弱,表明在高原寒冷景观区地球电化学方法对隐伏金矿体赋存范围和产出形态均有指示作用。结合地电化学异常成因机制、成矿地质条件,初步构建了高原寒冷景观条件下破碎带型金矿地电化学找矿模型。