浅析用血乳酸值调节、控制中长跑的训练强度

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。     

新型最小流量装置开发研究

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。     

Defect in mitochondrial functions in damaged human mitral valve

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.     

Negative Valve Overlap Mode of HCCI Operation Using Gasoline and Diesel Blended Fuels

The negative valve overlap (NVO) strategy of HCCI operation was experimentally investigated on a gasoline HCCI engine operated with variable valve timing in association with the addition of diesel fuel. The experimental results show that, by using gasoline and diesel blended fuels, the required NVO interval for suitable HCCI combustion under a given engine speed and a moderate compression ratio condition could be reduced, and the HCCI combustion region was extended remarkably without substantial increase in NOx emissions under a given inlet and exhaust valve timing due to the improvement of charge ignitability. In addition, the possible scale of NVO was extended. A substantial increase in the lean limit of excess air ratio and the upper limit of load range can be achieved because of higher volumetric efficiency, resulting from the decrease in the required NVO and the presence of less residual gases in cylinder.     

溢流阀的特性及应用

对溢流阀的特性及分类进行了介绍,并阐述了溢流阀在液压系统中多种功能的具体应用。     

水压轴向柱塞马达配流盘的研究

This paper has introduced the developments of water hydraulic axial piston equipments.According to the effects of physicochemical properties of water on water hydraulic components,a novel valve plate for water hydraulic axial motor has been put forward,whose moment exerted by the fluid field between valve plate and bearing plate is balanced entirely.The material screening experiment of valve plate is done on the test rig.Through numerical simulation the effects of some geometry parameters on the performance of water hydraulic motor have been studied.The silencing grooves on the valve plate in water hydraulic motor can reduce the pressure shock and the occurrence of cavitation effectively.It is evident that the appropriate structure should change the wear status between matching paris and reduces the wear and specific pressure of the matching pairs.The specimen with the new type valve plate is used in a tool system.     

一体化停水自闭式水阀创新设计

通过对现有停水自闭式水阀的现状及存在的主要问题进行分析,介绍了一体化停水自闭式水阀的工作原理及该水阀的创新点,并对该机构的使用前景进行了描述,对当今停水自闭式水阀的设计提供了一种新颖、实用的方法。     

一体化停水自闭式水阀创新设计

通过对现有停水自闭式水阀的现状及存在的主要问题进行分析,介绍了一体化停水自闭式水阀的工作原理及该水阀的创新点,并对该机构的使用前景进行了描述,对当今停水自闭式水阀的设计提供了一种新颖、实用的方法。     

基于CFD的电动截止阀内流道数值模拟及改进设计

电动截止阀是流体输送的重要元件.阀的传统设计方法很少从流体角度对其流道进行设计,其流阻系数比较大,容易造成局部压力损失.流体介质通过阀口时,流动方向发生变化,可能产生诸如局部涡流、空化、水锤和死水区等水流现象及湍流脉动噪声,对阀体有很强的破坏性,降低阀的使用寿命.基于RAN-S方程组和RNG k-ε湍流模型,利用CFD技术对全开启状态下的电动截止阀的内流道进行三维的湍流数值模拟,获得其总压图、速度矢量图、湍动能强度图.通过数值模拟,可以直观地显示阀的内流道中流体的流动过程.改变进出口段流道的长度、曲率以及阀杆在流道中的布局等,进出口的压力差相对于未改进前减少30%左右,速度突变区域明显缩小,局部涡流现象消失,湍动能强度也降低了15%左右.     

基于MCS-51单片机的远程浴室控制系统设计

给出了一种可进行远程控制的浴室控制器方案,浴室控制器主要由单片机、A/D转换器和电磁阀组成,设计了单片机与PC机之间的串行通信电路等。设计以MCS-51单片机作为系统控制单元,结合系统硬件电路设计和软件设计实现对电磁阀和A/D转换器的控制,从而实现对水温及浴池放水时间的控制。