多变量系统子结构系统零极点的递阶关系

多变量系统子结构系统零极点的递阶关系①周军庄炎吕振肃②（兰州大学电子与信息科学系，兰州７３００００）多变量系统零极点与系统观控性的关系已有结论［１］．但研究如多变量反馈系统通道切换和多重系统设计等问题时，需讨论系统局部结构与整体结构的关系．为此，Ｓ...

形状记忆合金智能子结构控制系统

根据形状记忆合金具有自感、自适应的特性 ,通过对土木工程中智能化控制系统的研究 ,提出了形状记忆合金智能子结构控制系统模型 ,并建立了一套智能控制过程 ,通过算例分析探讨了控制过程中应注意的一些问题 。

企业生态经济系统的派生子结构——绿色平衡计分卡的功能、形式与评价算法

从系统形态理论的视角,认识绿色平衡计分卡企业系统派生子结构的核心地位,以及其对企业生态经济系统稳态的形成与维持所具备的功能,对于发挥绿色平衡计分卡在企业生态经济战略实施中的作用极为重要。基于绿色平衡计分卡的系统稳态功能结构及实施逻辑,面向企业生态经济战略实施的需要,设计叠加式绿色平衡计分卡,建立相应的企业生态经济战略绩效评价指标体系,采用信息熵权法及动态递推方法,进行绿色平衡计分卡下的叠加分维度目标、各维度目标及战略总目标实现的评价,为企业平衡计分卡在企业生态经济系统稳态功能的实现提供技术支持和信息保障。

子结构组合系统分析中的分步计算法——用试验模态参数进行汽车整车动力学模型建模的探讨

本文应用子结构组合模态综合法,利用试验模态数据,在计算机上建立了一个包括汽车20Hz之前各阶弹性模态和刚体模态的整车动力学模型。为容纳尽可能多的模态数和测点数,提出了在模型计算过程中的分步计算法。

有独立抗震子结构的带填充墙钢框架性能分析

内填充墙独立子结构抗震系统(SIWIS)主要用于带砌体填充墙的框架结构中．它能减小框架柱和填充墙的地震损伤程度，从而提高结构的安全性。SIWIS系统南两片竖向和一片水平的三明治式轻质钢铆件组成．并且竖向构件中还有刚性单元，其目的是使填充墙在风载和非罕遇地震作用下能相互作用以减小结构的位移．但在被破坏时它会与主体结构脱离。

“停滞性”运转:论民主改革前西藏庄园社会的超稳定结构

在西欧庄园瓦解后,为何西藏的庄园社会仍然存续了几个世纪?现有相关研究难以作出充分科学的解释。文章基于已有研究,认为这关键在于西藏庄园社会中形成了一种超稳定的社会结构。这种超稳定的社会结构由五大子结构系统构成:上层政治结构、基层社会结构、经济结构、行政结构和意识形态结构。在它们相互影响、共同作用下,最终形成一个封闭单向控制的社会结构系统。庄园社会中“无发展无增长”的社会状态、固化的阶层以及无组织社会力量的缺失等,使西藏庄园内部难以形成内生力量去打破这种超稳定的状态,使超稳定结构能够长期存续。庄园社会长期处于“停滞性”运转的状态,促使西藏庄园社会长期处于低水平的有序运行。新中国成立后,中国共产党和现代国家力量的进驻,瓦解了西藏庄园社会的超稳定结构,翻开了西藏社会发展崭新的一页。

Research on Rice Panicle L-system Model Based on Substructure Algorithm

In order to decrease model complexity of rice panicle for its complicated morphological structure,an interactive L-system based on substructure algorithm was proposed to model rice panicle in this study.Through the analysis of panicle morphology,the geometrical structure models of panicle spikelet,axis and branch were constructed firstly.Based on that,an interactive panicle L-system model was developed by using substructure algorithm to optimize panicle geometrical models with the similar structure.Simulation results showed that the interactive L-system panicle model based on substructure algorithm could fast construct panicle morphological structure in reality.In addition,this method had the well reference value for other plants model research.

COMPOUND STRUCTURE OF NEW FOUR-SCROLLS CHAOTIC SYSTEM

The finding of the compound structure of a new four-scrolls chaotic system is reported, which is obtained by merging together two symmetrical attractors. And the two symmetrical attractors are generated only by adding a constant gain to the original system. Also, the forming procedure of the new four-scrolls chaotic attractor is explored and the relation between the constant gain and the properties of the system is given.

超分子别构催化剂形成的新型化学传感器

美国西北大学的Clad A Mirkin教授希望，可以建立起模拟生物系统的超分子结构系统。在过去10年中，他带领的小组一直试图研究超分子配位化学理论，以制造这样的超分子结构；同时，该小组一直在开发各种不同的相关探测系统。

Electronic and optical properties of anion-doped c-ZrO_2 from first-principles calculations

Using the first-principles calculations based on density functional theory(DFT),the structure stability,electronic and some optical properties of C and N doped cubic ZrO2(c-ZrO2) in 24-atom systems were investigated.It is found from the formation energies calculations that N ions are easier to be doped into c-ZrO2 than C ions.The electronic structure results show that Zr8O15C and Zr8O15N systems are semiconductors with the band gap of 2.3 eV and 2.8 eV,respectively,which are lower than that of the pure ZrO2(3.349 eV).And optical properties results depict that anion doping,especially C adding,can enhance the static dielectric function,visible and ultraviolet light absorption and reflecting ability of c-ZrO2 crystal.

Application of Automated Guided Vehicle (AGV) Based on Inductive Guidance for Newsprint Rolls Transportation System

The paper presents the development and performance of a kinematics control scheme for the AGV based on inductive guidance in transporting newsprint rolls. The required error is pre-computed using a kinematics model of the AGV taking into account the effect of various factors that contribute to improve tracking performance of the AGV. Simulation and experimental results illustrate that the kinematics model performs well and the results of various factors contribute to tracking performance of the AGV.

Exact Excitation and Abundant Localized Coherent Soliton Structures of （2＋1）—Dimensional Perturbed AKNS System

A simple and direct method is applied to solving the (2+1)-dimensional perturbed Ablowitz–Kaup–Newell–Segur system (PAKNS). Starting from a special B?cklund transformation and the variable separation approach, we convert the PAKNS system into the simple forms, which are four variable separation equations, then obtain a quite general solution. Some special localized coherent structures like fractal dromions and fractal lumps of this model are constructed by selecting some types of lower-dimensional fractal patterns.

Influences of Structure Disorder and Temperature on Properties of Proton Conductivity in Hydrogen-Bond Molecular Systems

The dynamic properties of proton conductivity along hydrogen-bonded molecular systems, for example, ice crystal, with structure disorder or damping and finite temperatures exposed in an externally applied electric-field have been numerically studied by Runge-Kutta way in our soliton model. The results obtained show that the proton-soliton is very robust against the structure disorder including the fluctuation of the force constant and disorder in the sequence of masses and thermal perturbation and damping of medium, the velocity of its conductivity increases with increasing of the externally applied electric-field and decreasing of the damping coefficient of medium, but the proton-soliton disperses for quite great fluctuation of the ＂force constant and damping coefficient. In the numerical simulation we find that the proton-soliton in our model is thermally stable in a large region of temperature of T ≤ 273 K under influences of damping and externally applied electric-field in ice crvstal. This shows that our model is available and appropriate to ice.

New Integrable Couplings of Generalized Kaup-Newell Hierarchy and Its Hamiltonian Structures

A new isospectral problem is firstly presented, then we derive integrable system of soliton hierarchy. Also we obtain new integrable couplings of the generalized Kaup-Newell soliton equations hierarchy and its Hamiltonian structures by using Tu scheme and the quadratic-form identity. The method can be generalized to other soliton hierarchy.

System failure analysis based on DEMATEL–ISM and FMECA

A new method of system failure analysis was proposed. First, considering the relationships between the failure subsystems,the decision making trial and evaluation laboratory(DEMATEL) method was used to calculate the degree of correlation between the failure subsystems, analyze the combined effect of related failures, and obtain the degree of correlation by using the directed graph and matrix operations. Then, the interpretative structural modeling(ISM) method was combined to intuitively show the logical relationship of many failure subsystems and their influences on each other by using multilevel hierarchical structure model and obtaining the critical subsystems. Finally, failure mode effects and criticality analysis(FMECA) was used to perform a qualitative hazard analysis of critical subsystems, determine the critical failure mode, and clarify the direction of reliability improvement.Through an example, the result demonstrates that the proposed method can be efficiently applied to system failure analysis problems.

Corrosion risk assessment of chloride-contaminated concrete structures using embeddable multi-cell sensor system

Monitoring the service condition of concrete structures requires the quantitative assessment of properties and corrosion rate of structural steels surrounded by concrete.A multi-cell sensor system that included a reference electrode,a chloride content sensor,a macrocell current unit and an electrical resistance measurement unit was developed.This system provided the following important electrochemical data in the cover-zone concrete on site:open circuit potential,macrocell current from anodes to cathode,chloride profile,concrete resistance and corrosion rate of built-in anodes.The experimental results show that the macrocell current increases when the chloride content in concrete is higher.Thus,monitoring the chloride content is a good method for monitoring the corrosion state.The chloride ion content and cover depth are the key factors that affect the electrical resistance of concrete.Without considering the temperature and time,a simplified model of the instantaneous corrosion rate of steel rebar in a concrete structure based on the measured chloride contents and concrete resistance was proposed.The test results further prove the reliability of this simplified predicting model.

Test Bench for Robotics and Autonomy： Overview and Test Results

In this paper, the TAS-I （Thales Alenia Space-Italy） Test Bench for Robotics and Autonomy （TBRA） is presented. It is based on a flexible and modular software architecture （Framework Engine）, in which each functional module （representing the GNC subsystems） implements a key functionality of the GNC （Guidance Navigation and Control）. Modules communicate by means of standardised interfaces designed for exchange of necessary information among the modules composing the entire system. This approach permits the interchange-ability of each subsystem without affecting the overall functionalities of the GNC system. In this paper, the TBRA system, together with the implemented functional modules will be described. Tests results will be reported and future development will be discussed.

Studies on the Second-Order Nonlinear Optical Properties of Parabolic andSemi-parabolic Quantum Wells with Applied Electric Fields

Within the framework of compact density matrix approach and iterative procedure, a detailed procedure for the calculation of the second-harmonic generation (SHG)susceptibility tensor is given in the electric-field-biased parabolic and semi-parabolic quantum wells (QWs). The simple analytical formula for the SHG susceptibility in the systems is also deduced. Numerical results on typical AlGaAs/GaAs materials show that, for the same effective width,the SHG susceptibility in semi-parabolic QW is larger than that in parabolic QW due to the self-asymmetry of the semiparabolic QW, and the applied electric field can make the SHG susceptibilities in both systems enhance remarkably.Moreover, the SHG susceptibility is also related to the parabolic confinement frequency and the relaxation rate of the systems.

Lower Energy α Elastic Scattering on ^(20)Ne and Anomaly of α+^(20)Ne Scattering System

The a＋^2＋ Ne elastic scattering angular distributions at lower incident energies of Eα= 12.7-31.1 Me V have been analyzed by using the a-folding potential based on the α＋^16O structure model of the ^20Ne nucleus. The a-folding potential with a standard Woods-Saxon type imaginary part, can reasonably describe experimental cross sections and the anomalous large angle scattering （ALAS） features. The anomaly of the a＋^20Ne scattering system is further confirmed , in the lower incident energy region.

The Construction of E-learning system Based on Ontology

To solve the irregular, poor efficiency and lowly reusable of resource, the hierarchy model of the ontology-based E-learning system is proposed. Some key techniques in the process of the project are also discussed in this paper, such as the ontology construction, the content ontology for describing the semantics of the learning materials.