AFS-933双道原子荧光光度计安装、验收与维护浅析

详细介绍了AFS-933双道原子荧光光度计的安装、验收情况,并对该仪器的使用注意事项和日常维护提出了建议。     

特征向量的LFSR序列分析中的应用

利用线性反馈移位寄存器（LFSR）的生成多项式的矩阵表示，通过对该矩阵的特征向量分析，给出了线性反馈移位寄存器输出结果的明确表达式。其中的系数完全依赖于初始输入值及其极小多项式的互反多项式的根，所得结果对LFSR的性质作了更进一步的揭示，比已知的结论更明确。     

柴油机运动机件虚拟模型库的开发

以柴油机运动机件为研究对象，研究建立柴油机三维模型的关键技术。主要研究内容包括零件尺寸的测量、三维模型的绘制、虚拟现实模型的编辑和模型的网页展示等。     

3-D Design and Numerical Simulation of Two-Phase Flow in the Laser Rapid Prototyping Coaxial Powder Delivery System

The metal powder direct and rapid prototyping technology is one of the most developing methods in the laser rapid prototyping technique. The coaxial powder delivery system is the key technique. The purpose of this paper is to introduce a new type of coaxial powder delivery system and simulate the metal powder and shield gas flow in the powder nozzle. 2-D and 3-D model of the new coaxial powder delivery system are established. Then gas-solid two-phase flow model and the k-? turbulent model are selected to simulate the flow of metal powder in powder nozzle. The Euler-Lagrange method is used in the simulating computation. The results show that the new coaxial powder delivery system has stable performance, uniform powder flux, high cooling efficiency, and long useful life.     

网络经济下的国有企业

文章从网络经济的概念、网络经济的发展趋势，网络经济对国有企业的影响，我国发展网络经济的思考，国有企业适应网络经济发展的对策等方面论述了网络经济下国有企业该如何应对的问题。     

现代科学对经络的揭示

本文是继《科技导报》１９９１年第３期（第３７～４０页）“生物电化学振荡”一文后,对经络研究新进展的进一步总结,其中有关生物电场的作用和针灸机制的探讨因前文已述,故本文从略。近年来针灸和经络研究在世界上受到日益广泛的重视,数以百计的随机分组对照实验肯定了针...     

<太西算要>发掘与探析

<太西算要>,明末孙元化著,前人多说失传.1983年,上海文物管理委员会在整理徐光启著作时,发现该书手稿.该书为明末传播西方数学的一部力作,介绍了笔算加、减、乘、除、开方的算法,以及等差、等比数列前n项求和公式和比例式.该书利用中国传统数学对方、廉、隅的几何解释说明开三、四乘方方法,使其中每一步骤清楚明了.     

影响甲A男排“自由人”防守能力因素的研究

以参加1999年漳州冬训及全国男排锦标赛的甲A男排的11名“自由人”作为研究对象，采用文献资料法、专家咨询法、问卷调查法、观察统计法、体育测量法、数理统计法，对“自由人”的防守能力与影响指标之间的内在联系展开系统、深入的研究，揭示了影响因素与防守能力之间的动态发展关系。研究结果表明：在众多的影响因素中，防守技术水平、神经类型、手臂肌肉用力感觉、选择反应时、脚反应时、操作思维、立体知觉这7个因素是影响我国甲A男排“自由人”防守能力的主要因素。     

Q2Chemistry: A quantum computation platform for quantum chemistry

Quantum computers provide new opportunities for quantum chemistry. In this article,we present a versatile, extensible, and efficient software package, named Q2Chemistry, for developing quantum algorithms and quantum inspired classical algorithms in the field of quantum chemistry. In Q2Chemistry, the wave function and Hamiltonian can be conveniently mapped into the qubit space, then quantum circuits can be generated corresponding to a specific quantum algorithm already implemented in the package or newly developed by the users. The generated circuits can be dispatched to either a physical quantum computer, if available, or to the internal virtual quantum computer realized by simulating quantum circuits on classical computers. As demonstrated by our benchmark simulations, Q2Chemistry achieves excellent performance in simulating medium scale quantum circuits using the matrix product state algorithm. Applications of Q2Chemistry to simulate molecules and periodic systems are given with performance analysis.     

Exponential Stability of the Euler-Bernoulli Beam Equation with External Disturbance and Output Feedback Time-Delay

This paper concerns the stability of a one-dimensional Euler-Bernoulli beam equation with external disturbance and output feedback time-delay, in which the disturbance is bounded by an exponential function. In order to estimate disturbance, the authors design an estimator of disturbance,which is composed of two parts: One is the system measurement that is called the eigen-measurement,another is a time-variant estimator of disturbance. Thus, the feedback controller which is based on the estimate of the disturbance is designed to stabilize the system. The finite-time stability of the system under this control law is proved by Lyapunov function method. Finally, some numerical simulations on the dynamical behavior of the closed-loop system is presented to show the correctness of the result.