焙烧炉天然气燃烧自动控制系统的研究与应用

介绍了炭素焙烧炉燃烧系统的改造,新型控制系统的功能介绍、使用效果和效益分析,通过改造真正实现了清洁生产,达到了节能效果,改善了工艺水平,提高了产品质量,降低了生产成本,提高了生产效率,改善了工作环境。     

民主革命时期中国共产党农业政策对政局的影响

民主革命时期,中国共产党在充分调研基础上制定的农业政策使其社会动员能力发挥到极致,成功地调动了占中国人口绝大多数的农民的政治斗争热情,巩固了中国共产党政权的政治基础;其农业政策调动了农民的生产积极性,发展了农业生产力,保证了战争条件下的军粮民食供给,奠定了革命胜利的经济基础;其农业政策改变了农村阶级力量对比,颠覆了传统农村社会秩序,完成了农村社会秩序的重建,莫定了新民主主义革命胜利的社会基础,最终夺取了全国政权.     

轧钢加热炉改造

针对轧钢加热炉加热能力不足,炉墙冒火,自动化控制水平落后的情况,对加热炉进行了改造,延长了加热炉的长度,更换了单蓄热式空气烧嘴,并对自动控制系统进行了升级改造,从而消除了炉墙冒火的现象,提高了加热能力和自动控制水平,降低了煤气消耗,取得了良好的经济效益。     

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。     

小铁山矿充填工艺的应用优化与发展

本文针对小铁山矿充填系统设计及生产实际中存在的问题,通过充填工艺的改进和参数的优化,提高了充填接顶率,保证了充填质量,确保了安全生产,降低了矿石的损失和贫化,避免了西部充填频繁爆管的发生,降低了充填成本,提高了矿山的经济效益,保证了矿山的持续、稳定发展。     

冷床上卸钢液压系统改造

对原液压系统设计及使用中存在的问题 ,进行了分析、计算 ,找出了原因所在 ,提出了改造方案 ,从而有效地提高了液压系统的稳定性 ,减少了设备故障 ,降低了维护强度 ,提高了工作效率。     

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。     

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。     

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...     

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。     

Application of Centralized and Decentralized Control to Building Structure: Analytical Study

This paper presents both the centralized and decentralized control strategies by using semiactive control devices (magnetorheological dampers) for building structural control under seismic excitations. The control algorithms used in this study only focus on the linear quadratic Gaussian control theory with acceleration measurements as feedback signals. In the centralized control, the control force is generated directly from the measurement in each degree of freedom, while in the decentralized control, only measurement from local subsystems is used to calculate the control force with respect to the locations of control devices and measurements. Four groups of centralized/decentralized control algorithms are studied: fully centralized control, fully decentralized control, half-centralized control, and partially decentralized control. The ASCE 20-story benchmark building is selected as an example to evaluate the control performance among different control strategies.     

Longitudinal analysis of specific domains of internal control and depressive symptoms in patients with recurrent cancer.

The relation between perceptions of control and depressive symptoms was examined in a longitudinal study of patients with recurrent cancer. Five domains of control (self-blame, control over cancer onset, control over symptoms, control over the course of the illness, and overall control over life events) were found to be independent of one another. In cross-sectional analyses, depression symptomatology was negatively correlated with illness course control, symptom control, and overall control. Cross-lagged longitudinal analyses using structural equation modeling suggested only onset control and overall control were significantly associated with depressive symptomatology over the 8-month interval. Greater baseline onset control predicted greater follow-up depression, whereas higher baseline depression predicted lower follow-up overall control. The importance of developing and using domain-specific measures of control and investigating the association of control and adjustment in longitudinal analysis are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Flatness and Profile Integration Control Model for Tandem Cold Mills

 Using the effective matrix methods of flatness and profile control synthetically, the flatness and profile integration control scheme for tandem cold mills is built in order to increase flatness and profile control precision of tandem cold mills. Corresponding control strategies are adopted for various control objectives of different stands and the coordination control strategies of various stands are given, which makes the on-line flatness control cooperate with on-line profile control and implements the parallel control of different stands. According to the measured flatness and profile data of some 1550 mm tandem cold mills, the control scheme is verified and the result indicates that the scheme has high flatness and profile control precision with steady and reliable control process. A new way and method is supplied for researching shape control of tandem cold mills.     

120t转炉煤气干法除尘控制系统

针对莱钢120t转炉煤气干法除尘系统，简要介绍了其控制系统的硬件配置，详细阐述了蒸发冷却器喷水预设定控制、出口温度自学习控制、静电除尘器电场自记忆控制、转炉烟罩微差压阻尼控制、输灰系统双摆阀逻辑控制、引风机吸气自选择控制、切换站压力无扰动切换控制等功能。     

广义预测控制在泵池回路中的应用

广义预测控制融合了预测控制和自适应控制的优点,是自适应控制中另一类型的预测控制方法,易于在线估计参数,以实现自适应控制。磨矿生产中,泵池回路控制是一个复杂的慢时变动态过程控制,具有很强的非线性、强耦合、大滞后、强干扰等特性,而传统的PID控制算法很难达到理想的控制效果和较高的自动投运率。为此,针对泵池控制回路的特点,提出基于模型性能指标和加权系数的广义预测控制算法,建立了泵池控制模型,并于2010年将该模型应用于金川选矿厂磨矿生产的泵池回路控制。实际工业应用表明,这种广义预测控制具有较强的适应性和较高的控制精度,控制效果优于传统PID控制算法。     

热连轧层流冷却系统的控制模型及控制策略

主要介绍了热轧带钢层冷系统中的控制模型及控制策略，包括液位控制、目标卷取温度的前馈控制和带有Smith预估器反馈控制等。其中通过液位控制可以得到稳定的液位，这对保持集管流量的稳定和上位机预设定的精度都是非常重要的。卷取温度的前馈控制和反馈控制对卷取温度控制精度的提高是必不可少的手段。这些控制模型和控制策略已经在工厂中得到应用，并且取得了很好的控制效果，说明这些控制模型和控制策略可以广泛应用于热连轧厂的冷却系统中。     

焦炉加热复合智能控制系统的研究与应用

 焦炉是具有大时滞、强非线性、多变量耦合、变参数的复杂对象。直行温度受多种因素的影响,传统的控制方法难以满足焦炉加热控制的要求。提出了间歇加热控制与加热煤气流量调节相结合的控制原理,利用模糊控制、神经网络等智能控制方法建立了焦炉加热的智能控制策略和模型。该控制策略采用一前馈、二反馈和智能控制相结合。根据焦化机理建立焦炉供热量前馈模型,并提出结焦指数CI反馈模型控制焦炉的炼焦过程。基于线性回归和RBF神经网络构建火道软测量模型,为控制建立温度反馈环节。智能控制方法用于调节停止加热时间和加热煤气流量。最后研究开发了焦炉加热的复合智能控制系统。实际运行结果表明：该系统能够实现焦炉加热的智能控制,稳定了焦炉生产,有效地提高了焦炭质量和降低了能耗,具有很好的实用价值。     

房地产项目成本控制分析

成本控制和管理历来是房地产开发项目的重心.通过分析成本的来源,结合实践从五个关键控制点展开论述,即土地开发及相关费用控制、规划设计控制、合同控制、工程预(决)算控制、甲供材料控制.     

Smith预估自适应FuzzyPID控制器在乳化液温度控制系统中的设计

分析乳化液温度控制因时滞因素对系统造成的严重影响,提出采用模糊控制、PID控制和Smith预估方法相结合的控制方案,使系统的控制不仅有较好的鲁棒性和控制精度,而且对时滞长、非线性因素明显的控制对象亦有较好效果。MATLAB的Simulink软件仿真结果显示,该控制方案明显优于单一的模糊控制和PID控制,能够达到预期效果。     

Primary and secondary control over age-related changes in physical appearance

Beliefs about appearance-related changes due to aging were used to test the effects of perceived control and secondary control (acceptance) in a sample of 412 young, early-middle-age, and late-middle-age college-educated adults. Mean difference in aging-related appearance control and hypotheses regarding the adaptiveness of primary and secondary control were examined. Primary control over aging-related appearance was lower in older adults and secondary control was higher. In addition, the results indicated support for the Primacy/Back-Up Model that primary perceived control is important at all levels of actual control. Those with stronger beliefs in their primary control were less distressed. Secondary control served a back-up function in that it was related to less distress only for those who had medium or lower beliefs in primary control. The implications of these findings, that primary control may be advantageous even in low-control circumstances, are discussed.