基于Agent的水声对抗仿真系统建模与仿真分析

分析了水声对抗仿真系统的组成和特点,基于Agent方法进行了水声对抗仿真建模,建立了Agent实体的功能层、信息层和认知层的模型结构,给出了基于Agent的系统结构和个体Agent的建模过程,从一个新的视点上研究了水声对抗分布仿真系统,最后总结了这种仿真体系的特点和长处。     

基于梯度迭代法的一类追逃对抗模型研究

针对一类追逃对抗问题，基于微分对策理论，建立了三维空间中的追逃对抗模型，进而得到了最优性条件和最优策略。运用梯度迭代法给出了模型的数值解，并做了实例分析．分析结果显示。该模型可以很好地应用于潜艇对潜艇、潜艇对水面舰艇等实际追逃对抗问题。     

一体化军队体系建设研究

体系对抗包括对敌方体系的破击和对己方体系的防护，实施体系对抗需要拥有一体化军队体系．总结了一体化军队体系的主要特征，并着眼这些特征，给出了一体化军队体系建设的思路和方法．该项研究对于加速我军一体化体系建设，提高打赢信息化条件下局部战争的能力具有积极的推动作用．     

优先权下大型交互对抗服务网络的稳定性研究

近年来,物联网、大数据与云计算为各种大型服务系统及其资源管理与任务调度提供了新的信息技术,也导致了这些服务系统中出现了大范围、松耦合、跨组织与异构性等多种关键特征.为了研究这些大型服务系统,交互对抗网络(Adversarial Networks)以其简便的确定性假设与直观的稳定性评估等优点而成为国际上一个热点且重要的研究方向.本文首先分析了一个具有优先权的环形交互对抗服务网络,并通过数学建模提出了一种确定性上界估计方法,由此讨论了这种网络的系统稳定性问题.然后,研究了系统性能指标并且给出了任意一个顾客在网络中运行时间的一个上界.最后,通过数值算例研究了网络中两类顾客总数的上界以及它们在网络中运行时间的上界是如何依赖网络中的一些关键参数.     

基于流程的面向对象企业建模体系结构研究

重点讨论了针对企业信息集成的模型体系结构的相关问题。首先讨论了针对企业信息集成建模的限制因素，以及由此产生建立企业动态模型体系结构的要求。其次讨论了面向对象方法在企业建模领域应用的问题。最后，在对若干流行的体系结构(特别是ARIS)分析的基础上，建立了基于流程的面向对象企业模型体系结构，给出了该体系的模型框架、各主要视图、视图间关系和建模的实施步骤。     

武器系统研制费投资分布规律的仿真研究

针对大型项目多峰、复杂费用分布的传统仿真建模方法模型选取过于复杂、且难以达到精度要求等不足，提出将一种基于支持向量机的机器学习方法应用于大型复杂武器系统研制费投资分布研究．计算结果表明，这种方法有效弥补了传统建模方法的缺陷，有更好的泛化能力和实用性，因而可以作为研究此类问题的一种新方法．     

理论研究方法在膜超(微)滤研究中的应用

在对超(微)滤的过滤性能及过程的研究中，实验研究作出了很多贡献，但实验研究存在着结论对具体实验体系有很大依赖性、研究费用较高等缺点．介绍几种较经典的扩散模型和流体动力学模型及其建模思路、适用范围和存在问题；提出借助理论分析和计算方法设计实验，再根据实验数据利用人工神经网络建立普用性模型的新方法、对于方程的求解，介绍了简化法、摄动法、数值计算与模拟等方法的特点及其在超(微)滤研究中的应用，认为用数值计算的方法研究超(微)滤机理及膜器优化设计必将成为今后超(微)滤研究的重要方向之一．     

结合CAD／CAM与VRML技术实现虚拟建模和文件优化

VRML已作为Web3D领域主流的开发平台。在三维建模的过程中除充分利用自身的程序建模语言进行建模外，对于造型复杂的模型，充分采用第三方建模软件（如SolidWorks，pro／E）来建立相应的模型并转换成wrl文件，这样极大地减少了制作模型的难度，节约了时间。但是由第三方软件所转换的文件也存在着体积大，程序结构紊乱，不利于文件的进一步处理和实现模型的人际交互。因此，对模型的空间位置进行调整，缩减其文件体积，优化模型效果是建立虚拟环境的关键。针对这些问题提出在VRML中的模型建立方案和转换VRML文件的优化技术。     

基于特征的CAD／CAM集成模型的研究

基于特征建模的CAD／CAM集成技术的研究已经成为CAD发展的一个重要方向，也是实现CIMS必须要解决的关键技术之一，根据在I－DEAS基础上对特征建模技术的研究，重点介绍了有关特征描述，特征定位及特征组合等方面的问题，并介绍了特征模型的管理方法及发展前景。     

基于Agent的网络对抗仿真系统模型研究

网络对抗仿真系统是对网络安全人员网络安全培训的有效工具,系统的建模为系统的具体实现提供参考。介绍Agent建模的基本理论,对网络对抗仿真系统的框架进行研究,并对基于Agent的网络对仿真系统的基本模型进行描述和分析。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...