热电厂电气的安全使用

热电厂电气的安全使用包含的有几个方面的内容。主要分为热电厂电气主设备的安全选择、热电厂电气运行的安全管理的措施、在工作中防治电气失误操作的措施和对策以及在热电厂安全生产中的个性化和人性化的管理等等。热电厂电气的安全使用对电厂的生产以及人们的正常的生产和生活都有重要的意义,因此,本文通过对热电厂电气的安全使用的几个方面的论述来进一步说明在热电厂的工作流程中电气的安全使用所占有的重要地位。特别是在经济迅速发展的中国,在电力建设的规模不断扩大的中国,作为热电厂的一名工作人员,更是要尽自己的力量来使电厂的各方面得到快速协调的发展。通过对热电厂电气的安全使用的论述,使得热电厂向着速度更快、电容量更大、参数更高以及电网更大的方向发展。     

智能控制及其在火电厂热工自动化的应用

我国的电力工业目前的发展十分的迅速,比较大的容量火力发电机组也是逐渐成为电网中的一个骨干的机组。对单元机组的提出了更高的要求是由于我们必须保证单元机组的每时每刻都要正常的运行,且必须保持高度的安全性和经济性。每一个单元机组都有大迟延和严重的非线性以及扰动的频繁的特点,对于传统的控制方法来说,它们目前已经不能满足电网对机组的一些要求了,所以先进的智能化控制策略必须将要取代常规的控制策略,先进的智能控制策略将会成为火电厂控制发展的一个趋势。解决不确定性系统控制的难题的一个有效的方法是模糊控制,就是所谓的以神经元网络控制为代表的智能的控制策略。在最近的一些年中模糊控制已经取得了一个巨大的发展,在未来的日子里它将会在复杂的热工过程控制中发挥着重要的作用。本文主要研究的是新型智能控制系统,它在工程的使用价值上具有重要的意义。     

计量检定规程管理标准化的问题与对策

随着现在社会的不断发展,很多的领域对于一些数据的精确程度的要求也在不断的提高。我们开始不断的加强对于计量检定的标准化,从而使计量检定能够更加的精确,更好的服务于社会的各个行业。因此计量检定的时候,一定要做好相关的标准化的工作。本文就针对于计量检定的标准化的问题进行相关的探究工作,并提出相关的对策。     

浅谈高边坡支护预应力锚索施工技术

现今随着我国的社会不断的发展,人们的生活水平不断的提高,国家大力加强对于公路的建设。但是,随着公路的建设,路边的一些边坡问题也逐渐的显露出来,预应力锚索的施工技术也不断的改进完善,并且存在很大的优势,在公路的边坡的防护中起着很重要的作用。     

财务管理模式的创新变革

随着我国的企业的制度和规章的建立健全,财务管理的相关工作就被看做是企业运作过程中的一项较为基本的工作。财务管理的优劣直接影响着企业的发展命脉。伴着我国的经济全面的发展和复苏,我国的企业在财务管理方面的进步和完善已经得到了大众的认可,给社会带来了一种全新的财务管理模式。我们为了满足企业的长足发展,财务管理的创新升级就需要结合企业自身和当下的社会软环境的要求来进行。本文就是针对了财务管理的相关结构问题,深度的剖析了财务管理的本质和变革,希望对我国的财务管理方面的创新和改革有一定的帮助。     

网络条件下高校图书馆从传统管理向现代管理的转型

网络技术的使用时的信息化的社会和数据化的市场的步伐都实现了加速,同时时的图书馆的资料的信息服务性的功能也得到相应的提升。还时的图书馆的资料在服务领域进行整合的过程中实现了飞跃、网络技术在实现自己优势发挥的同时,对于相应的图书信息资料的整合设定了更高的标准和规范。所以目前的高校的图书馆必须对自己就有的模式进行改革和整合,才能顺应新时代和社会对我们提出的要求,实现从就有的制度到全新的模式的过度。也即从传统的管理模式向着现代化的管理进行转型。     

图像信息处理用的透镜——富利叶变换透镜,f·θ透镜

1.序言在拥有大量的信息必需进行处理的今天及未来,把图像作为媒介的信息处理系统的发展是必不可缺少的。在那样的图像信息处理系统中,担负图像的传递和变换任务的光学系统的重要性也是不言而喻的,对于这样光学系统的研制和发展的要求是随系统的实     

文化素质培养促进青少年篮球运动员的可持续发展

文化素质做为人的素质的一个方面,正是保障人的全面发展提高人的整体素质的一个重要影响因素。文化素质的高低直接影响着人的可持续发展是否能向着正确的方向稳步的前进。青少年篮球运动员作为人类的一股特殊人群力量,是人们关注的焦点,他们的可持续的发展也将是人们所关心的问题。     

局域网计算机的全面安全管理

随着计算机网络的飞速发展,网络的安全管理工作将越来越重要。网络结构以及通信方式的不断更新,使的网络复杂性不断增强,这种动态的、分布的复杂的网络环境,给局域网的安全运行带来的不少难度。本文局域网的安全管理的功能的目的出发、分析了影响局域网安全的主要因素,并提出了行之有效的局域网安全管理办法,为营造一个信息的交流与沟通提供了一个安全的网络环境。     

晚报走势浅见

随着社会主义市场经济的不断深入发展,人民的生活水平迅速提高。社会的发展和人们生活的需要促使新闻业也发生了急剧的变化。媒体自身的发展和媒体之间的相互竞争形成了新闻事业的的热闹局面。那么在这种情况下,晚报自身的发展处于怎样的一种态势之下,晚报的发展趋势是怎样的,晚报应如何保持自身的生命力并在日益激烈的竞争中走出自己的路子呢？     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

Mechanism Study on the Wear of CrAlTiN Coated High-Speed Steel Twist Drills Under Dry Cutting Conditions

As demands about environment protection are growing up, dry cutting technology is getting more and more concerns from all over the world. Main works performed here are study on dry cutting performances and wear mechanisms of M2high-speed steel (HSS) twist drills with CrAlTiN multicomponent coatings, which was deposited using magnetron sputter ion plating system, in drilling 45 and 30CrMnSiA steel, and their comparisons to those in drilling the same steel but using monolayer CrN and commercial TiN coated drills. Drilling performances of drills are evaluated mainly through the measurements of width on outer corner flank land and the cutting forces. Results show that performances of CrAlTiN coated drills are better than those of monolayer CrN and TiN coated drills. In drilling 45 and 30CrMnSiA steel, the average tool life of the CrAlTiN coated drills are 17.2 and 11.8 times higher than those of the uncoated drills. Observing wear of the drill with scanning electronic microscope, results show that there is no crack or spallation of the CrAlTiN coatings in wear zones. Main mechanism of the wear here is adhesion.     

Study on Bond Ability of Arc-Spraying Coatings with Different Surface Pretreatment on Cast-Iron

Arc spraying coatings are widely used in various applications, but uncommon in cast iron substrate. Different surface pretreatment technology is tested on substrates of gray cast iron. Surface roughness and residual stress were measured by TR200 and X-ray diffraction analyzer. Influence of different surface pretreatment methods ( dry blasting and fusebond) on roughness and residual stress was analyzed. The arc-sprayed coatings of wire 3Cr13 (φ2mm) on gray cast iron substrate is studied. The microstructure and interface of bonding layer were observed by SEM. The bond strength was taken by tensile test. Results show that bond strength with grit blasting is higher than fuse-bond; it is feasible to make wire 3Cr13 coating with arc spraying on cast iron substrate roughened by grit blasting.     

Structural Characteristics of TiO2 Ceramic Coating by Micro-Plasma Oxidation

TiO2 ceramic coatings with thickness of 20 μm were formed on the surface of pure titanium by micro-plasma oxidation. Their micro-structures were investigated by by using X-ray diffraction and their surface images were detected by using scan electronic microscope. There were three kinds of TiO2 coatings, pure anatase type TiO2 phase, mixed phases consisted of rutile type TiO2 phase and anatase type TiO2 phase, pure rutile type TiO2 phase. The coating surface with the pure anatase type TiO2 phase is rough, while the coating surface with the pure rutile type TiO2phase is smooth. The upper coating surface with the mixed type TiO2 phases is anatase type TiO2 structure and the subsurface of the TiO2 coating is rutile type TiO2structure.     

Evaluation of fatigue life of steel using steel grain size

The insightful discussion of the relationship between the construction of metallographic and fatigue life and proposition of mathematical relationships describing this relationship was conducted in the paper. This paper presents a method for estimating the fatigue life, based on the construction of the microstructural material taking into account the grain size and the participation of ferrite and pearlite phase.