"HFN-301型农药残留快速检测仪"的安全质量分析评价

"HFN-301型农药残留快速检测仪"各类技术参数比较先进,检测结果质量安全可靠,2005年国家农标中心对此类仪器进行检测评比,为优秀型农残仪,得到了有关单位表扬和奖励.本文对"HFN-301型农药残留快速检测仪"的设计原理及自主创新特点等进行介绍分析.     

混凝土未测区域质量预测方法研究

文章针对桩基超声波测试评价桩身混凝土质量，提出了回归分析、灰色理论和三次样条函数三种方法在预测未知区域的应用。尤其三次样条法有较好的应用前景，为桩基可靠度评价提供了保证。     

用实二次型理论解多元函数的极值问题

文章以二次型理论为依据,提出了解决多元函数极值问题的另一种方法.     

基于图像分割应用于临床上检测HP的一种快速算法

研究了利用图像分割技术,去辨别染色后的胃部切片是否有HP(Helicobacter Pylori幽门螺旋菌),并给出了一种二维直方图与FCM(Fuzzy Clustering模糊聚类)相混合的图像分割方法.运用色彩特征抽取技术,可以更加精确和快捷地识别HP.     

Security Analysis of Discrete Logarithm Based Cryptosystems

0 IntroductionNowthere are many well known cryptosystems based ondiscrete logarithms , such as the ElGamal cryptosys-tem[1]and the digital signature algorithm(DSA)[2]. Discretelogarithms have many advantages . Breaking the discrete log-arithm modulo pri mepappears to be somewhat harder thanfactoringintegern,and elliptic curve cryptosystems may usemuchsmaller keysizesthan RSA-basedcryptosystems of com-parable security.The discrete logarithmproblemover a group can be bro-ken down into a numb…     

兖矿集团煤炭营销组合策略研究

通过对兖矿集团煤炭营销组合策略中产品及分销策略的现状分析，揭示兖矿集团目前的营销状况；并在此基础上提出了若干思路和对策，旨在加快构建适应兖矿大集团战略的营销体系。     

甲基萘转移甲基化合成2,6-二甲基萘

以β-甲基萘和混合甲基萘为原料,均四甲苯和偏三甲苯为烷基化剂,无水alCl3为催化剂,二氯甲烷为溶剂,进行转移甲基化反应合成2,6-二甲基萘.考察了反应温度、催化剂和烷基化剂的加入量以及烷基化剂种类对反应结果的影响.     

或有事项对企业财务能力影响的分析——兼谈会计中的不确定性

阐述了或有事项引起的财务报表变动，建立了一套财务指标，分析了或有事项对企业财务能力的影响，并指出在不确定性会计处理中应注意的几个问题。     

Principal component analysis using neural network

The authors present their analysis of the differential equation dX ( t )/dt = AX ( t ) - X^T( t ) BX( t)X( t), where A is an unsymmetrical real matrix, B is a positive definite symmetric real matrix,X E Rn ; showing that the equation characterizes a class of continuous type full-feedback artificial neural network; We give the analytic expression of the solution; discuss its asymptotic behavior; and finally present the result showing that, in almost all cases, one and only one of following eases is true. 1. For any initial value X0∈R^n, the solution approximates asymptotically to zero vector. In thin cane, the real part of each eigenvalue of A is non-positive. 2. For any initial value X0 outside a proper subspace of R^n,the solution approximates asymptoticaUy to a nontrivial constant vector Y( X0 ). In this cane, the eigenvalue of A with maximal real part is the positive number λ=Ⅱ Y (X0)ⅡB^2 and Y (X0) is the corre-sponding eigenvector. 3. For any initial value X0 outsidea proper subspace of R^n, the solution approximates asymptotically to a non-constant periodic function Y( X0 , t ). Then the eigenvalues of A with maximal real part is a pair of conjugate complex numbers which can be computed.