TRT顶压控制系统及其安全性的研究与优化

介绍了天钢1~#TRT顶压控制系统,对现有的顶压控制系统进行了分析,在原有差压调节模式的基础上增加了顶压调节模式,将实际操作改为差压调节与顶压调节两种互选模式,提高了系统的发电效率;对旁通阀组的控制进行了优化,优化后极大地提高了系统的安全性,保证了炉顶压力的稳定,延长了设备的使用寿命,产生了较高的经济效益。     

提高转炉护炉效果的实践

从转炉耐材的损害机理入手,分析了耐材的损耗机理,探讨了炉渣的优化机制,对炉渣的组成及渣料的使用进行优化,对溅渣的工艺进行了改进,实现了转炉护炉的提升,延长了转炉的使用寿命,降低了耐材的损耗,降低了转炉工序的成本。     

废水处理站自动控制系统的应用

介绍了邯钢冷轧废水站的配套项目废水处理站的自动控制系统,主要从自控设备组成、网络控制系统等方面论述了控制功能的实现,该系统的应用为ERP的数据采集提供了很好的保证,提高了电气控制的集成度和可靠性,简化了控制环节,提高了生产效率.     

浅议矿脉变化规律与探矿方法

概要介绍了樟东坑矿区的主要地质特征,在前人工作的基础上,对矿床的基本特征(尤其是矿脉的变化特征)进行了分析、探讨和总结;利用这些特性及其变化规律,采用一些新的探矿方法不但找到了一些隐伏盲矿,增加了地质储量,延长了矿山的服务年限,而且降低了探矿费用,减少了采矿的盲目性,节约了成本,增加了经济效益。     

采用Boost技术优化企业数据备份保护架构

为了解决大型制造企业数据中心架构变更后,在数据保护方面所面临的多种难题,对适用的数据保护技术进行了研究探讨.最终实现了企业数据保护平台架构的转型升级,提升了平台自身的安全性,改善了备份数据的传输架构,备份效率提升了10倍以上.实现了备份任务的集中智能管理,节约了备份窗口,实现了备份资源的一次性分配与自动回收,释放了备份...     

ACS6000SD变频器在粗轧机主传动系统中的应用

济钢中厚板厂3500线粗轧机改造主传动系统采用ACS6000SD变频驱动系统,系统的整流侧和逆变侧采用了对称结构,降低了维护难度;采用了IGCT技术,保证了系统的性能响应;使用了DTC技术,提高了系统的鲁棒性。这种交直交系统做到了对电网的最少谐波运行,既减少了对电网的污染,又省去了无功补偿系统的投资。     

工业机器人在鞍钢型钢生产线的设计与应用

根据鞍钢股份有限公司型钢生产线工艺实际,制定了机器人硬件设计方案和机器人软件实现方案,实现了工业机器人自动贴标喷码技术在型钢生产线的应用.该系统的应用满足了产线工艺要求,提升了产线生产效率,提高了产品标识的准确性和可追溯性,贴标准确率和喷码准确率均达到了99％,实现了危险岗位无人作业,作业周期缩短了25％;同时,实现了产品标识的统一规范性,提升了企业产品形象.     

空压机积炭的原因及改进措施

本文分析了影响空压机积炭堆积过快的原因,介绍了生产工艺中存在的问题及改进措施,改进后减少了空压机积炭堆积的速度,延长了空压机部件使用寿命,降低了维修成本,提高了空压机利用率和运行效率,达到节能降耗的目的。     

镁挤压工业及技术发展概况与趋势

经过近20年的快速发展,我国镁挤压工业与技术获得了跨越式进步,不仅兴建了一批现代化的镁挤压企业,投产了一批3600t左右的现代化镁合金挤压机及其配套设备,而且开发了大批新技术、新工艺和新产品,大幅度降低了生产成本和提高了生产效率,拓展了应用领域,成为世界镁挤压大国。本文详细阐述了挤压成形在轻合金材料加工中的重要地位,指出热挤压成形是镁及镁合金材料最重要的加工方法,介绍了国内外镁挤压工业及技术的发展概况与趋势。     

泵池分矿箱旋塞提升机构的改造及应用

原有泵池分矿箱旋塞提升机构操作困难,使用寿命短,研究设计并制作了新形式的旋塞提升机构。经过现场的安装试用,彻底解决了操作困难的现象,排除了故障缺陷,消除了操作时存在的安全隐患,保障了岗位操作人员的人身安全,减少了检修维护的工作量,降低了技术。     

Ni和Nb元素对Fe-Cr-Mo合金力学和阻尼性能的影响

摘要：采用光学显微镜、扫描电镜、透射电镜、弯曲共振试验机和万能材料试验机等分析了复合添加质量分数0.8%Ni元素和0.1%Nb元素的Fe-Cr-Mo合金组织和析出相的大小、形态,研究了Ni和Nb元素的添加对Fe-Cr-Mo合金力学性能和阻尼性能的影响。结果表明,Ni和Nb元素的加入不但使合金晶粒显著细化,而且有效抑制了富Cr析出物的析出,使析出物明显细化且分布弥散。晶粒和析出物的细化同时提高了合金的强度和塑韧性,尤其是显著地提高了材料的塑性。1000和1100℃退火后,Ni和Nb元素的加入将提高减振合金的矫顽力,降低磁致伸缩系数,使减振合金的阻尼性能降低。900℃退火后,Ni和Nb元素的添加虽然提高了合金的矫顽力,但由于Mo元素的回溶使磁致伸缩系数增大,阻尼性能获得提高。     

惩罚与激励双视角下绿色矿山建设的演化博弈与仿真

为推进绿色矿山建设、转变矿业发展方式,基于博弈论和系统动力学构建地方政府和矿山企业的博弈模型,并引入动态惩罚机制和动态激励机制,对博弈双方进行稳定性、均衡点分析以及模型仿真.研究结果表明:在静态机制下,地方政府和矿山企业的行为呈周期性变化,不能达到稳定均衡状态;当地方政府采用动态惩罚机制和动态激励机制时,演化博弈过程呈...     

阳极板载运车提升卸载装置改进与优化

介绍了贵溪冶炼厂极板转运设备阳极板载运车提升卸载装置的组成及工作原理,并从提升卸载装置缺乏自由度、限位支架损坏摆动撞击、提升装置倾斜重力、硬性碰撞冲击四个方面分析了提升卸载装置产生变形的原因,最终确定是由于提升装置倾斜重力、硬性碰撞冲击导致提升卸载装置产生变形。通过分析,采用加强立板的方式进行改进优化,经计算验证,改进方式是可行的,可以解决阳极板载运车提升卸载装置变形的问题。     

Some features of DNA-tRNA hybrids in the rat

The importance and value of manometry are presented with examples of patients in labour. It is important to distinguish between the pressures and the forces working on the fetus, especially as far as the causes of fetal bradycardia are concerned. Graphs of magnetic lag are shown in order to demonstrate that the tension on the fetus and sometimes on the placenta and the cord precedes and lasts longer than the increase in hydrostatic pressure which accompanies a contraction. The paper includes the following subjects: Introduction and general observations. The patient and the monitoring device and the tolerance to external and internal manometry by the patient. The concepts of pressure and force. The distrubution of pressures and forces in obstetrics. The measure of forces by their conversion into pressure in a manometric system. The interpretation of the results of the measure of pressure and force in obstetrics.     

Microscopic identification of the powder of roots of genus Adenophora. I. The roots of Sect. Basiphyllae and Sect. Pachydiscus

This paper deals with the microscopic characteristics of the powder of the roots of Genus Adenophora. Eighteen species and subspecies have been studied. The results show that Sect. Basiphyllae and Sect. Pachydiscus can be identified easily based on the amount of sclerified cork cells, and 18 species, subspecies and varieties can be identified according to the amount, shape and thickness of the walls of the sclerified cork cells, the diameter and pit of the vessels, the number and shape of the secretion of the laticifers, and the number of inulin crystals.     

Diagnostic imaging in otorhinolaryngology--assessment of current status

BACKGROUND: The first conventional x-rays of the paranasal sinuses were received in 1897, just two years after the detection of x-rays. During the following decades several modifications and extensions of conventional radiologic techniques were developed, but routine imaging procedures of the head and neck were mainly restricted to pictures of the paranasal sinuses and the temporal bone. In the fifties, tomography was developed, which gave us a more detailed insight of the anatomy and pathology of the paranasal sinuses and temporal bone. During the last two decades the development of new techniques, i.e. computed tomography (CT) and magnetic resonance imaging (MRI), has significantly increased the importance of modern imaging for the diagnostic evaluation of head and neck diseases. These diagnostic tools enable us to visualize anatomical structures and pathological entities with an accuracy never been expected beforehand. The pace of the improvement of these diagnostic tools, however, requires that both radiologist and otorhinolaryngologist keep up with the adequate indications of CT and MRI in the different areas of the head and neck. A close relationship and cooperation between radiologist and ENT surgeon is therefore indispensible for a fruitful and cost-effective use of modern imaging. Otherwise the patient is exposed to modern medical technology without an equivalent benefit. The purpose of the present paper is mainly to give an update and state of the art of modern imaging techniques in otorhinolaryngology, head and neck surgery. Different areas i.e. paranasal sinuses, temporal bone, salivary glands, oral cavity and oropharynx as well as the neck are discussed in terms of adequate indications for modern imaging in the diagnostic evaluation of different lesions.     

加卸载下原煤力学特性及渗透演化规律

基于自主研发的煤岩热流固耦合试验系统,在考虑实际开采方式的条件下,进行轴压升高和围压降低的加卸载试验,分析研究不同加卸载速率下原煤的力学特性和渗透演化规律.结果表明:加卸载过程中,轴向应力的加载速率越大,峰值应力附近的曲线平台越长,峰值应力、轴向应变和环向应变也越大,体应变则越小.不同加卸载速率比下含瓦斯煤变形模量均先迅速减小后缓慢减小,到破坏时再迅速降低,而后逐渐保持稳定趋势;在相同轴向应变时,加卸载速率比越小,煤样的变形模量越大.加卸载过程中,煤样的偏应力、渗透率与应变的关系可分为三个阶段:初始压密与弹性阶段、屈服破坏阶段和破坏后阶段.加卸载速率比越小,煤样达到峰值应力时,含瓦斯煤的渗透率和体积变形越大.      

钛渣酸解过程中物相变化特征探讨

明确物相变化是剖析钛渣酸解机理和改进酸解工艺的关键点之一.综合应用化学分析、X射线衍射(XRD)分析、矿物解离分析以及扫描电镜形貌分析对某74钛渣酸解过程中主要物相的含量、形貌变化以及Ti、Si两种元素的含量及赋存变化进行了研究.结果表明:钛渣主要由黑钛石和辉石组成,酸解过程中黑钛石含量逐渐减小,辉石含量逐渐增加;反应...     

The School of Medical Sciences of the University of Santiago de Chile

The Medical Sciences School of the University of Santiago de Chile, is an institution inserted in the occidental culture and therefore on its conceptions and traditions. It subscribes the Principles defined in the Universal Declaration of the Human Rights of the United Nations and especially the importance of the human person, as an entity irrepetible, different to others. The human rights are over the institutions, the society and the laws of science. The Faculty considers the family as the cell or natural and fundamental element for the development of the human being in the society. It defines its historic mission as the search of the truth and the achievement of a society in pro of the welfare and health of the people in a frame of excellence, justice, humanism, efficiency and participation. As an expression of the cultural patrimony it should create and transfer knowledge. As guarantor of the ethical principles it should protect the dignity that emanates from the transcendent nature of the person and its moral principles and therefore its right to life, justice, freedom, equality, health, education, and happiness. As a paradigm of progress it must be involved in modernization and should impulse the development. As an entity committed with Society it should participate in the search of solutions for politics and programs looking for a higher level of life and a better model of health. The profile of our graduated students will identify them due to their profound spirit of welfare of the person, his family, his community, ethical sense, solidarity, justness and humanity, their orientation to the community and the environment with a solid professional formation in the strategy of Primary Health Care. They will provide education in health for the whole family in order to improve a better way of life. They will be trained to detect and solve the risks of individual, communities and environment. Research is also a priority of the Faculty in order to contribute to solve the problems of health of the Nation, since there is no development without education and there is no education neither development without health. For the Faculty the achievement of these purposes is mandatory and we will make them reality through the Prometeo Project 1997-2001.