反向区逐步逼近调节平衡法调节QJ一23型箱式单臂电桥

介绍一种能使电桥迅速平衡的方法     

Constraint on linear, spatiotemporally nonlocal, spatiotemporally nonhomogeneous constitutive relations

The structure of modern electromagnetic theory imposes a fundamental constraint on the constitutive relations which describe linear material media. Here, in extension to previous work, we provide a proof of this algebraic constraint for the most general type of linear medium: one that is bianisotropic and spatiotemporally nonhomogeneous as well as spatiotemporally nonlocal.     

开尔文电桥测电阻及用Visual Basic处理测量数据

用开尔文电桥测量金属棒的电阻率时,电阻率的不确定度是由测量金属棒直径、长度和电阻的不确定度来决定。为了又快又准确地处理实验的测量数据,设计编制了Visual Basic程序,从而方便快捷的计算出金属棒电阻率的不确定度。     

沉淀法制备超细氧化铝粉末过程中的团聚机理和消除办法

采用沉淀法以Al(NO3)3.9H2O和NH3.H2O为原料制备了Al(OH)3干凝胶,经过高温煅烧合成纳米级的α-Al2O3粉末,分析了在制备过程中氧化铝粉末产生团聚的机理,推测了硬团聚的机理模型,并提出了几种消除硬团聚的方法,制备出的α-Al2O3粉末,粒径分布均匀,且无明显团聚,近似球形,平均粒径为70nm。     

Regional business cycle synchronization through expectations

This paper provides an example in which regional business cycles may synchronize via producers’ expectations, even though there is no interregional trade, by means of a system of globally coupled, noninvertible maps. We concentrate on the dependence of the dynamics on a parameter η which denotes the inverse of price elasticity of demand. Simulation results show that several phases (the short transient, the complete asynchronous, the long transient and the intermediate transient) appear one after another as η increases. In the long transient phase, the intermittent clustering process with a long chaotic transient appears repeatedly.     

Google matrix of business process management

Development of efficient business process models and determination of their characteristic properties are subject of intense interdisciplinary research. Here, we consider a business process model as a directed graph. Its nodes correspond to the units identified by the modeler and the link direction indicates the causal dependencies between units. It is of primary interest to obtain the stationary flow on such a directed graph, which corresponds to the steady-state of a firm during the business process. Following the ideas developed recently for the World Wide Web, we construct the Google matrix for our business process model and analyze its spectral properties. The importance of nodes is characterized by PageRank and recently proposed CheiRank and 2DRank, respectively. The results show that this two-dimensional ranking gives a significant information about the influence and communication properties of business model units. We argue that the Google matrix method, described here, provides a new efficient tool helping companies to make their decisions on how to evolve in the exceedingly dynamic global market.     

零折射率材料的物理与应用

零折射率材料因其异常的电磁/光学特性在电磁波操控、新型天线和波导器件、非线性光学、光学吸收、电光调制等领域有着广泛的应用前景。文章首先介绍了零折射率材料的分类和实现方法,然后总结了零折射率材料的基本概念和电磁/光学特性,包括电磁波在零折射率材料中的折射、反射特性和“隧穿”效应,掺杂杂质对二维和三维体系的零折射率材料的影响,各向异性零折射率的电磁特性,零折射率材料内外的电场分布特性;最后介绍了零折射率材料的部分典型应用,并对零折射率材料的研究进行了展望。     

Analysis of stock prices of mining business

Stock exchanges have a diversity of so-called business groups and much evidence has been presented by covariance matrix analysis (Laloux et al. (1999) [6], Plerou et al. (2002) [7], Plerou et al. (1999) [8], Mantegna (1999) [9], Utsugi et al. (2004) [21] and Lim et al. (2009) [26]). A market-wide effect plays a crucial role in shifting the correlation structure from random to non-random. In this work, we study the structural properties of stocks related to the mining industry, especially rare earth minerals, listed on two exchanges, namely the TSX (Toronto stock exchange) and the TSX-V (Toronto stock exchange-ventures). In general, raw-material businesses are sensitively affected by the global economy while each firm has its own cycle. We prove that the global crisis during 2006–2009 affected the mineral market considerably. These two aspects compete to control price fluctuations. We show that the internal cycle overwhelms the global economic environment in terms of random matrix theory and overlapping matrices. However, during the period of 2006–2009, the effect of the global economic environment emerges. This result is well explained by the recent global financial/economic crisis. For comparison, we analyze the time stability of business clusters of the KOSPI, that is, the electric/electronic business, using an overlapping matrix. A clear difference in behavior is confirmed. Consequently, rare earth minerals in the raw-material business should be classified not by standard business classifications but by the internal cycle of business.     

Worldwide business opportunities in fiber optic communications

The world market for fiber optic intelligence transmission systems is forecast through I990 and segmented according to the geographical regions of production and demand. The total world market forecast is also segmented according to end-industry application. Fiber optic component markets are forecast and price trends are reviewed. The most significant future developments in components are discussed. The major business opportunities are outlined and the possible threats to development of a viable market are reviewed.     

Worldwide business opportunities in fiber optic communications

Abstract

The world market for fiber optic intelligence transmission systems is forecast through I990 and segmented according to the geographical regions of production and demand. The total world market forecast is also segmented according to end-industry application. Fiber optic component markets are forecast and price trends are reviewed. The most significant future developments in components are discussed. The major business opportunities are outlined and the possible threats to development of a viable market are reviewed.     

数字温度计制作实验及研究

本文介绍了设计性实验——数字温度计制作实验的开设,并对实验中存在的问题进行了研究和解决。     

Detonation waves in bubble-drop media

Wave processes in chemically active multicomponent media: liquid — gas bubbles — liquid drops have been studied experimentally. Existence of detonation waves in multicomponent (bubble-drop) media has been proved. Structure of detonation waves in bubble-drop and bubble media is qualitatively identical: detonation waves are solitary waves with pulsation profile the pressure behind which is close in value to the one in unperturbed medium. Propagation velocity of detonation waves in bubble and bubble-drop media drops with the increase in medium gas phase concentration and with the decrease in carrier liquid viscosity. Presence of liquid drops decreases detonation wave velocity compared with bubble medium that does not contain liquid drops. Detonation wave propagation in multicomponent media causes gas bubbles fragmentation as well as fragmentation of individual liquid drops. The work was financially supported by the Russian Foundation for Basic Research (Grant No. 04-03-33106).     

渐变型多孔介质中燃气燃烧特性试验研究

试验研究预混燃气在渐变型多孔介质(GVPM)中的燃烧特性,包括在渐变型多孔介质中的温度场、火焰移动、CO和NOx生成、燃烧稳定性及多孔介质孔径结构对燃烧特性的影响规律。研究结果与几种均匀型多孔介质(HPM)中的燃烧特性进行比较,发现渐变型多孔介质中的燃烧有如下优点:均匀的温度分布、较低污染物排放、高燃烧速率、高稳定性、宽燃烧极限和较大的负荷调节范围。     

The potential of bit patterned media in shingled recording

Shingled recording on continuous and bit patterned media (BPM) is compared. From a recording viewpoint, continuous media have the advantage due to the lack of a need to synchronise writing with dot position. For BPM the write windows at 4 Tbit/in² are only a couple of nm across, requiring extremely tight manufacturing tolerances. In readback, BPM have the higher SNR over a wide range of areal densities due to the absence of transition noise and erase bands. Significant increases in areal density could be achieved using BPM, provided dot uniformity could be maintained.     

A perspective on ellipsometry

Two distinct and general definitions of ellipsometry and polarimetry are stated ab initio that account for the existing duality in usage of both terms. Ellipsometers and polarimeters are next defined accordingly. The definitions contrast these commonly used similar terms against one another. Viewed within the framework established by these general definitions, optical ellipsometry of interfaces and films (the main topic of this conference) is recognized as a narrow particularization of a broad scheme. Examples of ellipsometry (polarimetry) in different regions of the electromagnetic spectrum provide important perspective on the considerable extent of the field. Another perspective (in a different dimension) is gained when the application of ellipsometry (polarimetry) to different samples is considered. This relates ellipsometry of interfaces and films to polarimetry of bulk anisotropic samples and light scattering by systems of particles. Three individual procedures (namely, polarization measurement, application of electromagnetic theory, and computation) are identified as essential to the complete utilization of ellipsometry (polarimetry).     

Gray radiation transport in multi-dimensional stochastic binary media with material temperature coupling

Models for radiation transport through stochastic binary media are tested in two and three dimensions. Theoretical models for stochastic media transport usually assume Markovian processes and exponential chord length statistics that are not fully realizable in multi-dimensions. Therefore, the previous validation studies done using one-dimensional (1D) transport are not necessarily applicable to multi-dimensions. The work presented here analyzes pure radiation transport and radiation when it is coupled to material energy balance. The sensitivity to chord length statistics is found to be different for these two cases. The assumptions made to linearize the transport equation are discussed and results for both linear and nonlinear transport are shown. For the coupled radiation and material problem in 2D and 3D, the mean radiation field differs significantly from previous analyses done in 1D. The differences between 1D and multi-dimensions are discussed. Modeling of the mean radiation field in the parameter range explored can be achieved with a simple formula for the mean opacity when the opacities are constant in space and time. Temperature-dependent opacities in stochastic media require different formulas for the effective opacity.     

A perspective on nonlinear dynamics

We present a brief report on the conference, a summary of the proceedings, and a discussion on the field of nonlinear science studies and its current frontiers.