基于FPGA的单片机的系统的设计

本文在阐述可编程逻辑器件特点及其发展趋势的基础上,利用EDA的硬件和软件技术,研究和设计了基于FPGA的8051单片机的片上系统。本文采用VHDL语言,应用先进的自顶向下的设计方法,在Active—HDL5．1编程环境下,应用层次化的设计思路,模块化的设计方法进行设计。     

任意矩阵的谱的Euclid距离的估计

设A=A E是A的任意扰动矩阵。本文给出了当A分别是任意Hermite矩阵和可对角化矩阵时。它们谱的Euclid距离的估计。     

渗铝钢的的应用

渗铝广泛地应用于石油、化工、电力、冶金、建筑、汽车制造、农业机械等方面.从五十年代开始,上海、山东、辽宁、四川、湖北等地相继将渗铝钢用在石油,化工、水电等部门取得较好的效果. 我厂试用的渗铝钢有热浸渗铝(称渗铝钢)和热喷涂铝(称喷铝钢)两种. 渗铝钢有良好的耐高温氧化性能,在某     

诚挚的祝福 无尽的感谢 殷切的希望

正计量是经济活动、国防建设、科学研究和社会发展的重要基础,渗透到人类活动的各个领域。是支撑社会经济有序发展和可持续发展的必要条件;是保证产品质量,提高综合国力的重要手段;是国际间科研合作和经济贸易的基础保证。计量是企业提高产品质量,实现经济效益的重要基础,在企业的发展中起着重要     

山里的小学山里的孩子山里的老师

秦岭七十二道峪,其中一峪为“秀龙峪”,是传说中汉朝皇帝刘秀避难之地。该峪有一下峪村,村里的四组有一所当年部队驻扎时拥建的小学。     

有关消防工程的给水设备的设计的分析

市场经济下,经济科技不断发展,现代工程项目建设更为先进,其结构设计也趋于复杂化,给消防工程建设增加了难度,所以对消防工程中的给水设备提出了更高的要求,给水系统中的设备主要有水池、水高位水箱、泵接合器、消防栓等。本文主要分析给水设备的设计要求,使其能够符合消防工程的应用。     

计算机病毒的预防的思考

计算机病毒随着计算机的普及也渗透到信息化办公的各个领域,带给计算机操作系统难以防范的困扰。为使计算机信息安全有保障,研讨计算机的病毒的防范措施迫在眉睫。针对计算机病毒如何预防进行探究,并分析应对措施。     

白芍的药用的分析

白芍具有养血柔肝,缓中止痛,敛阴收汗。治胸腹胁肋疼痛,泻痢腹痛,自汗盗汗,阴虚发热,月经不调,崩漏,带下等功效。     

有关于水资源的合理高效的利用的分析

水是人类生产和生活最基本资源,由于水资源的不合理开发和使用,现代社会的水资源形势非常的严峻。本文主要探讨了通过在工业、农业和生活用水中合理高效的使用水资源来增加水资源利用率的方法,以期对水资源的高效利用提供参考。     

基于JAVA的动态代理实现的AOP的研究

通过JAVA的动态代理技术,可以使应用程序的核心业务与非核心业务在逻辑方面的耦合度得到以一定程度的降低,促进AOP的实现。在对AOP以及JAVA动态代理技术简单介绍的基础上,详细阐述基于JAVA的动态代理事务处理的基本原理。     

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.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from