Research on the methods of detecting and removing slide valve failure     

Li Wei  Li Wei-bo  Wu Gen-mao  Wei Jian-hua 《浙江大学学报(A卷英文版)》2000,1(1):56-60

Various ways for detecting slide valve failure are discussed in the paper. Specifically, a new method for detecting slide valve sticking state is first presented. The method does not depend on any special sensor and is only based on the detection of oscillation current wave within a valve coil. Results of theoretical analysis and experimental research are given for comparison. In order to remove a slide valve sticking online, a concept and method of “electrical hammer” is introduced. At last, an application example of the methods is discussed. In fact, it is an electro-hydraulic turbine system with failure diagnosis, fault-tolerant and trouble removal functions. Project (59775003) supported by NSFC  相似文献   

钢质节能型制冷截止阀的安装与维护     

李重阳  冯国强 《焦作大学学报》2014,(2):103-104

文章介绍了钢质节能型制冷截止阀的工作原理,分析了其安装与使用规程、常见故障及排除方法、维护和保养的要点等,从而保证阀门的安全使用,延长其使用寿命。  相似文献   

脉冲式布袋除尘器的过滤与清灰     

张家飞  徐兆春 《马钢职工大学学报》2014,(1):11-13

过滤与清灰技术是布袋除尘器设计的核心内容。内容包括：脉冲式布袋除尘器过滤和清灰的普遍工作机理。  相似文献   

汽油发动机配气机构常见故障诊断与修复     

王建国 《泰州职业技术学院学报》2014,(4):60-62

配气机构是控制发动机进气和排气的装置,其性能及工作状态直接影响发动机的混合气浓度、充气效率等重要参数及发动机工作状况等。文章综述了汽油发动机配气机构的主要功用、常见故障的现象及原因分析,并提出了相应的检测方法和修复方法。  相似文献   

群体性事件中的媒体报道的存在问题、成因与对策   总被引：2，自引：0，他引：2  

曾凡斌 《科学．经济．社会》2011,29(3):151-158

我国发生的群体性事件呈现出数量增多、规模上升、范围扩大的态势。随着环境与社会的变迁,近几年媒体对群体性事件已开始有所报道,但是在面对手机与互联网等新媒介挑战,媒体的报道结果并不理想。媒体对群体性事件存在早期报道反应迟钝,后期报道戛然而止,报道质量上缺乏客观、公正,甚至出现假新闻等问题。群体性事件的风险性,政府、媒体、公众的博弈和法律制度三方面是目前群体性事件下的媒体报道的制约因素。群体性事件发生有着深刻的社会原因,其不仅具有负面功能,还具有正面功能。媒体需要发挥社会＂安全阀＂的作用,为此,我国需要扩展媒体在群体性事件中的报道空间,及增加媒体报道社会问题和社会矛盾的量和度。  相似文献   

从以人为本的角度探讨太极拳的锻炼价值   总被引：3，自引：0，他引：3  

翟少红 《西安体育学院学报》2006,23(6):48-50,69

通过文献研究法、归纳法、分析法和逻辑法,对太极拳的健身价值、竞技价值、技击价值、教育价值进行梳理,探讨了人们对太极拳锻炼价值的需要,提出了坚持以“以人为本”为出发点和落脚点,才能在研究和弘扬太极拳锻炼价值时,既注意到太极拳锻炼价值的全面性,又注意突出锻炼者在太极拳价值观方面的个性差异。认为以“以人为本”发挥太极拳锻炼价值的关键在于以锻炼者的需求确定价值取向、以价值取向引导太极拳的发展。  相似文献   

体育大众传播在构建和谐社会中的功效   总被引：3，自引：0，他引：3  

郭讲用 《上海体育学院学报》2006,30(6):69-73

运用文献资料法,对体育大众传播在我国构建社会主义和谐社会中的功效进行分析,阐释大众传播的“监视社会环境”、“协调社会关系”功能在构建和谐社会与和谐体育中的具体应用。提出:体育大众传播对“社会安全阀”理论的解读和对体育文化社会软控制功能的传播具有现实意义。  相似文献   

浅析用血乳酸值调节、控制中长跑的训练强度   总被引：2，自引：0，他引：2  

陈重 《山西师大体育学院学报》2002,17(1):86-87,95

衡阳市体校中长跑组9名男运动员运动后的血乳酸值、有氧阈和无氧阈及心率等指标进行了测试，并对测试数据进行了较为全面系统的量化分析，为教练员在训练中评定运动强度、合理安排训练负荷和间歇时间以及监控训练效果等方面提供参考建议和实践依据。  相似文献   

新型最小流量装置开发研究     

杨杉  江文贱 《江西电力职业技术学院学报》2002,15(1):11-16

新型最小流量装置是将原来给水泵的再循环阀与再循环减压装置于一体。其作用是当汽轮发电机组启动、停机时 ,给水泵流量小于最小值时 (一般为额定流量的 30 % ) ,为防止泵内流量过小出现过热或汽化 ,此装置自动打开 ,故称最小流量装置。当流量超过最小值时 ,则装置自动关闭。此装置对于确保火力发电厂发电运行参数的稳定 ,保证机组发电安全 ,有着重大意义。Turbo -bascade多级节流最小流量阀 (新型最小流量装置 )目前国内尚无开发。开发该项目应用前景广阔 ,社会经济效益巨大。  相似文献   

Defect in mitochondrial functions in damaged human mitral valve     

Santosh Shinde  Pawan Kumar  Kaushala Mishra  Neela Patil 《Indian journal of clinical biochemistry : IJCB》2006,21(2):156-160

Mitochondrial diseases are a heterogeneous group of disorders in which a primary mitochondrial dysfunction is proven by morphological, biochemical, and genetic examinations. The mitral valve has important function in the regulation of blood flow from one chamber to another. Often, the mitral valve becomes abnormal with age, in Rheumatic fever or it is abnormal from birth (Congenital) or it can be destroyed by infection i.e. bacterial endocarditis and needs replacement. Myocardial function depends on energy produced by mitochondria and in any of these disease conditions, mitochondrial functions and enzyme activities may be impaired. With this in view, we analyzed the relationship between preoperative clinical conditions (as per New York heart Association) and extent of mitochondrial enzyme activities in damaged Human mitral valve in two types of heart disease such as Rheumatic Heart Disease (RHD) and Bacterial Endocarditis (BE). Thirty nine Patients undergoing cardiopulmonary bypass (CPB) for routine valvular heart surgery were included in the study. Controls included 11 normal porcine mitral valve samples without any evidence of heart disease. Mitochondrial enzymes like cytochrome oxidase (COX), succinate dehydrogenase (SDH), malate dehydrogenase (MDH), citrate synthase (CS) and ATPase were determined. Mitochondrial COX, SDH, CS and Total ATPase activities were significantly decreased in disease condition like BE and RHD when compared with control (P<0.001). On the other hand as per New York Heart Association (NYHA) preoperative clinical classification, all the mitochondrial enzymes were significantly (p<0.05) impaired in class IV as compared with NYHA class I, II and III. Present study shows that impairment in the mitochondrial enzymes activities are more pronounced in bacterial endocarditis (BE). It also indicates that damage to mitochondrial enzymes are most pronounced in NYHA class IV.  相似文献