关于刚体转动惯量测定的计时方法研究

本文给出了在刚体转动惯量的测定中测定时间的计时装置，减小了计量时间所带来的误差。     

渐近公式在全息干涉计量中的应用

渐近公式在全息干涉计量中的应用史正心，马荣冠（锦州师范学院物理系）（吉林省纺织工业学校）振动体的时间平均全息干涉计量实验是本科生必做的近代物理实验之一．不少院校都开出了该实验．理论上的讨论得到的振动体表面各点光强的分布，是零级贝塞尔函数调制的结论，但...     

提高温度物性的磁致伸缩超声波位置检测器

磁致伸缩超声波检测器可用于检测直线移动物体的位置,这是通过超声波传播的时间来计量的.它具有非接触计量的优点.由于超声波传播速度随温度变     

国防光学测试计量进展与展望

国防光学测试计量进展与展望郑克哲，陈进榜（国防光学计量一级站）（南京理工大学）苏大图，李德富（北京理工大学）（兵器工业总公司）国防和民用的光学计量测试在测试参数上是类似的，但国防光学计量测试是为保证国防科技和军工产品研制、试验，生产及使用全过程中量值...     

基于低压电力载波通信的单相智能电表的设计

为了对单相智能电表进行远程实时监控管理,设计了一种基于载波芯片PL3201和计量芯片90E24的单相智能电表;该设计把直接序列扩频通信技术应用于低压电力线载波通信,使得系统的抗干扰能力得到显著提升;同时,该设计采用了IDT公司最新推出的高精度计量芯片90E24进行计量,其计量精度优于目前业内水平,能在相当时间内满足国家电力部门对计量精度的要求;实践结果表明,该设计不仅成本低廉、方法简单,且计量精度高、抗干扰能力强,适用于低压载波集中抄表系统。     

闰秒的由来

 悠悠岁月,时光荏苒,人类社会千百年来的发展都是沿着一个重要的参考轴线连续进行的,这个参考轴线就是时间。那么到底什么是时间,人们如何来计量时间呢?     

光辐射计量测试技术

简要介绍国外光辐射计量采用的主要方法、测试手段和发展趋势。为了满足国防系统对光辐射计量的需要建立了一批计量标难，解决了光辐射源辐射特性和探测器特性计量测试问题。     

激光与计量基准

激光以它的良好的物理性质（单色性好、方向性强、能量大等）而被广泛应用到科学与技术许多领域。激光应用于计量科学和利用激光变更计量基本单位的定义和复现其定。都为计量科学的发展起到革命性的作用，文章介绍了激光与米定义及其复现，激光与秒定义，激光与国际温标，激光与质量自然基准和一系列激光在计量测试中的应用。     

论“计量保证方案”在光谱光度透射比值传递中的应用

根据美国ＮＩＳＴ“计量保证方案”原理，提出国防科工委光学计量一级站“光谱光度０．２５～２．５μｍ范围内透射比量值传递的计量保证方案”的方案，并用此原理和统计学原理详细讨论具体实施方法。     

激光参数计量测试

简要介绍国防科工委光学计量一级站在激光参数计量测试方面的技术现状，以及激光功率、激光能量、激光空域和时域参数计量测试标准的工作原理、技术指标和量传情况。     

Noether symmetry and conserved quantity for a Hamilton system with time delay

In this paper, the Noether symmetries and the conserved quantities for a Hamilton system with time delay are discussed. Firstly, the variational principles with time delay for the Hamilton system are given, and the Hamilton canonical equations with time delay are established. Secondly, according to the invariance of the function under the infinitesimal transformations of the group, the basic formulas for the variational of the Hamilton action with time delay are discussed,the definitions and the criteria of the Noether symmetric transformations and quasi-symmetric transformations with time delay are obtained, and the relationship between the Noether symmetry and the conserved quantity with time delay is studied. In addition, examples are given to illustrate the application of the results.     

含时滞的非保守系统动力学的Noether对称性

提出并研究含时滞的非保守系统动力学的Noether对称性与守恒量. 首先,建立含时滞的非保守系统的Hamilton原理,得到含时滞的Lagrange方程;其次,基于含时滞的Hamilton作用量在依赖于广义速度的无限小群变换下的不变性,定义系统的Noether对称变换和准对称变换,建立Noether对称性的判据;最后,研究对称性与守恒量之间的关系,建立含时滞的非保守系统的Noether理论. 文末举例说明结果的应用. 关键词： 时滞系统 非保守力学 Noether对称性 守恒量     

百kJ级储能型Marx发生器建立时间及抖动

针对"闪光二号"百kJ级储能型Marx发生器,设计了研究其建立时间和抖动的实验方案,根据发生器开关击穿模式的不同,分别研究了典型排的建立时间和抖动与Marx发生器建立时间和抖动之间的关系,研究了开关工作系数与Marx发生器及其典型排建立时间的关系。对Marx发生器建立时间、发生器第一排和第二排建立时间的实验测量表明:Marx发生器第一排建立时间对整个发生器的贡献大于60%,前两排建立时间对整个发生器的贡献大于73%;Marx发生器建立时间抖动主要来源于发生器第一排建立时间抖动,第一排建立时间和抖动则主要来自于气体火花开关的击穿时延抖动。根据实验结果,分析了影响建立时间抖动的主要因素,提出了减小建立时间抖动的措施。     

用傅里叶变换红外光谱显微技术鉴定纸张圆珠笔字迹及书写时间

本文运用傅里叶变换红外光谱显微技术,测定了不同圆珠笔在不同纸张上书写字迹油墨的红外光谱,比较了零时间测定和三个月测定的约外光谱,结果表明,不同品牌的圆珠笔字迹的红外光谱是不同的,零时测定和三个月测定的红外光谱也是不同的,讨论了影响书写时间鉴定的因素。     

First passage time statistics of Brownian motion with purely time dependent drift and diffusion

Systems where resource availability approaches a critical threshold are common to many engineering and scientific applications and often necessitate the estimation of first passage time statistics of a Brownian motion (Bm) driven by time-dependent drift and diffusion coefficients. Modeling such systems requires solving the associated Fokker-Planck equation subject to an absorbing barrier. Transitional probabilities are derived via the method of images, whose applicability to time dependent problems is shown to be limited to state-independent drift and diffusion coefficients that only depend on time and are proportional to each other. First passage time statistics, such as the survival probabilities and first passage time densities are obtained analytically. The analysis includes the study of different functional forms of the time dependent drift and diffusion, including power-law time dependence and different periodic drivers. As a case study of these theoretical results, a stochastic model of water resources availability in snowmelt dominated regions is presented, where both temperature effects and snow-precipitation input are incorporated.     

Multivariate analysis of dynamical processes

The analysis of multi-dimensional biomedical systems requires analysis techniques, which are able to deal with multivariate data consisting of both time series as well as point processes. Univariate and bivariate analysis techniques in the frequency domain for time series and point processes are established and investigated, although the number of investigations is strongly biased towards time series. Actual multivariate techniques for time series or hybrids of time series and point processes are scarcely addressed. Here, we present spectral analysis techniques which are able to analyse point processes as well as time series. Thereby, univariate, bivariate as well as multivariate techniques are discussed. Applications to simulated as well as real-world data reveal the abilities of the proposed techniques.     

Multifractal analysis of the Korean agricultural market

We have studied the long-term memory effects of the Korean agricultural market using the detrended fluctuation analysis (DFA) method. In general, the return time series of various financial data, including stock indices, foreign exchange rates, and commodity prices, are uncorrelated in time, while the volatility time series are strongly correlated. However, we found that the return time series of Korean agricultural commodity prices are anti-correlated in time, while the volatility time series are correlated. The $n$-point correlations of time series were also examined, and it was found that a multifractal structure exists in Korean agricultural market prices.     

Generalized Chaplygin equations for nonholonomic systems on time scales

The generalized Chaplygin equations for nonholonomic systems on time scales are proposed and studied. The Hamilton principle for nonholonomic systems on time scales is established, and the corresponding generalized Chaplygin equations are deduced. The reduced Chaplygin equations are also presented. Two special cases of the generalized Chaplygin equations on time scales, where the time scales are equal to the set of real numbers and the integer set, are discussed.Finally, several examples are given to illustrate the application of the results.     

An improvement on measure methods of the complexity theory and its applications

A new method is proposed to transform the time series gained from a dynamic system to a symbolic series which extracts both overall and local information of the time series. Based on the transformation, two measures are defined to characterize the complexity of the symbolic series. The measures reflect the sensitive dependence of chaotic systems on initial conditions and the randomness of a time series, and thus can distinguish periodic or completely random series from chaotic time series even though the lengths of the time series are not long. Finally, the logistic map and the two-parameter Henón map are studied and the results are satisfactory.     

混沌系统的时间延迟同步误差分析

对Pecora和Carroll的混沌自同步方案的延迟同步误差进行了研究.在计算机上对Lorenz混沌系统伪装的延迟同步误差进行了模拟:给定系统参数,对应不同延迟时间,得出了均方误差与采样步长的关系曲线;给定系统参数和延迟时间,对应不同采样步长,得到了混沌时间序列的误差曲线;给定采样步长,对应不同的系统参数,获得了混沌时间序列的尺度效应和均方误差与采样步长的关系曲线.提出了减小延迟同步误差的一些方法,得到一些对混沌同步和混沌控制应用有意义的结果. 关键词： 混沌同步 时间同步 误差分析