面向桥梁长期健康监测的大数据处理技术及应用

简要介绍了桥梁长期健康监测系统的应用,总结了基于桥梁长期健康监测大数据分析技术的研究现状。介绍了基于长期健康监测大数据分析在多尺度关联性分析、异常数据挖掘和分析以及时变可靠度研究三个方面取得的研究进展。通过多尺度关联性分析对各频率组分下的桥梁应变进行了分类,确定了温度对应变的影响;发展了利用应变阈值和小波细节系数进行异常信号识别的方法;提出了局部时变可靠度的计算方法。最后,对基于云计算的桥梁健康监测服务平台的研制及应用进行了介绍和展望。     

染料LB膜吸收光谱和光学存储效应的研究

通过对新型的染料LB膜(花氰-花生酸复合LB膜)的吸收光谱的测试,说明了LB膜中染料分子H-聚体结构的存在,而在立体简并四波混频实验中观察到这种LB膜具有可逆的光学记录与擦除效应,实验表明,在其中建立一个稳定的光栅,所用的记录光脉冲强度为30MW/cm~2,需要的累积记录时间为80ns(10个脉冲).最后在简化的三能级系统中,以分子处于各态的布居光栅模型说明了光致H-聚体,单体之间的转化是这种光学记录效应的主要原因.     

Monte Carlo simulation of aggregate morphology for simultaneous coagulation and sintering

A model for simulation of the three-dimensional morphology of nano-structured aggregates formed by concurrent coagulation and sintering is presented. Diffusion controlled cluster–cluster aggregation is assumed to be the prevailing coagulation mechanism which is implemented using a Monte–Carlo algorithm. Sintering is modeled as a successive overlapping of spherical primary particles, which are allowed to grow as to preserve overall mass. Simulations are characterized by individual ratios of characteristic collision to fusion time. A number of resulting aggregate-structures is displayed and reveals structure formation by coagulation and sintering for different values of . These aggregates are described qualitatively and quantitatively by their mass fractal dimension D_f and radius of gyration. The fractal dimension increases from 1.86 for pure aggregation to 2.75 for equal characteristic time scales. As sintering turns out to be more and more relevant, increasingly compact aggregates start to form and the radius of gyration decreases significantly. The simulation results clearly reveal a strong dependence of the fractal dimension on the kinetics of the concurrent coagulation and sintering processes. Considering appropriate values of D_f in aerosol process simulations may therefore be important in many cases.     

A Study on the Generating Mechanism of Vertical Joints in Loess

Based on field investigation, theoretical analysis and model testing, the authors believe that the horizontal tensile stress caused by gravity at the top and bottom of big voids or holes is the primary rea-. son for the generation of vertical joints in loess. This paper explains the generation mechanism of vertical joints in loess from the viewpoint of mechanics for the first time.     

Exact solution in a string cosmological model

We construct an exact solution of the Friedmann equations with a phantom scalar matter field originating in string field theory and show the absence of the big-rip singularity. The notable features of the model are a ghost sign of the kinetic term and a special polynomial form of the effective tachyon potential. The constructed solution is stable under small fluctuations of the initial conditions and special variations of the form of the potential. __________ Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 148, No. 1, pp. 23–41, July, 2006. An erratum to this article is available at .     

制作高质量、大版面体积反射全息图的一些新方法

本文对制作高质量、大版面体积反射全息图提出了一些改进意见，包括用光学双稳装置抑制由于外界扰动造成的干涉条纹的随机漂移，用１／２波片消除木纹噪声，为了提高衍射效率和信噪比，在拍摄参数上进行了选择，并在实验中取得了很好的效果。     

Principle of limitation of physical quantities and cyclic universe

A close study of Heisenberg uncertainty principles reveals many significant facts, and all four major physical quantities, energy, time, momentum and length, have both lower and upper limits. Now, many questions come up. What are these limits? Some answers may lead to the understanding of the development of our universe. What is the shortest limit of time? At the beginning of big bang, there exists a tremendously short time, the Planck time. This may be just the shortest time limit in our universe. The longest time limit might be the lifetime of our universe. The longest length might be the final diameter of our expanding universe. All these lead to a finite universe. Two more coupling formulae are formed for the other two pairs of physical quantities, mass and speed, thermal energy and temperature. These four physical quantities must also have limits. We already knew that speed has upper limit and temperature has lower limit. By these two formulae, Planck and Einstein equations are derived directly. Since most other physical quantities are somewhat related to these major physical quantities, it seems that there exists a principle of limitation of physical quantities. A quantitative sketch of big bang is described. It also shows that our universe will contract back to another big bang. The principle of limitation opens up some fields of investigation. It may bring nature back to the harmony and determined world described by classical physics.     

Application of the 5-Dimensional Projective Unified Field Theory to Cosmology and Astrophysics

Projective Unified Field Theory of the author leads to a cosmology without big bang. Since details have been published in a series of papers, the aim of this article is to inform about the theoretical and numerical results with respect to cosmology and astrophysics: age of the universe, Hubble factor, deceleration parameter, equation of motion of a testparticle, motion of a body around a gravitative central body, Einstein effects, time dependence of the "effective gravitational constant" etc. Further, this theory predicts heat production by the cosmological expansion in a moving body. Numerical results are presented for orbiting stars, planets, moons, satellites and terrestrial bodies.     

现代数字物理教学连载⑨——从"小"物理中讲"大"物理

探索与讨论了我国教育改革的方向和道路.从大学物理教学的9个具体例子,论述如何从小物理中讲大物理,如何从局部规律提升到全局的规律.通过教学理念的转变来提高教学效益是教学改革应高度重视的.     

Ф300F800哈特曼物镜的研制

研制出了一种能在外场使用的哈特曼物镜，该物镜口径为300mm，焦距800mm，视场为-1～1mrad，在0．532nm、0．6328nm、1．064nm三种波长（λ）下工作，主波长为0．6328nm。该系统光学材料全部采用德国进口Schott熔石英玻璃，物镜是高次非球面，用WYKO干涉仪检测，检测结果表明物镜波面误差PV值为λ／12，均方根值RMS优于λ／100。