浅析医院医疗设备的管理方法

医疗设备所固有的特点及日常管理上存在的种种不良现象,不仅给医院资源带来了很大的浪费,而且还会影响设备的正常使用。开展积极的维护保养工作,采取提前准备、主动出击、事后备注的方法,可以达到节省人力物力,提高设备安全性和可靠性的目的,确保医疗设备长期稳定地为临床服务。     

Hybrid force control of astronaut rehabilitative training robot under active loading mode

In order to mitigate the effects of space adaptation syndrome(SAS) and improve the training efficiency of the astronauts, a novel astronaut rehabilitative training robot(ART) was proposed. ART can help the astronauts to carry out the bench press training in the microgravity environment. Firstly, a dynamic model of cable driven unit(CDU) was established whose accuracy was verified through the model identification. Secondly, to improve the accuracy and the speed of the active loading, an active loading hybrid force controller was proposed on the basis of the dynamic model of the CDU. Finally, the actual effect of the hybrid force controller was tested by simulations and experiments. The results suggest that the hybrid force controller can significantly improve the precision and the dynamic performance of the active loading with the maximum phase lag of the active loading being 9° and the maximum amplitude error being 2% at the frequency range of 10 Hz. The controller can meet the design requirements.     

瓦斯火焰诱导沉积煤尘燃烧爆炸机理的实验研究

在全透明的火焰加速管中,利用火焰加速系统和高速摄像系统,对管道中瓦斯火焰诱导沉积煤尘参与燃烧和爆炸的机理进行了实验研究,讨论了障碍物的特征尺寸和瓦斯浓度对火焰传播速度的影响.实验结果表明:当有障碍物存在时,瓦斯煤尘火焰的传播速度迅速提高,且障碍物的特征尺寸越大,火焰传播速度越快,瓦斯浓度越接近化学当量比,瓦斯煤尘火焰的传播速度越大.     

大电解槽大极板的应用实践

本文介绍了济源市万洋冶炼（集团）有限公司采用“大电解槽、大极板”的电铅工艺，以及应用实践中遇到的问题和解决方法，公司电铅工艺运行以来，取得了良好的技术指标和经济指标。     

对高师地理教材教法课程教学改革的思考

联系中学新课程标准的实施对中学地理教师教学能力和素质的要求,探讨了高等师范学校的地理教材教法课程在教学内容、教学形式、考核内容及方式方面的改革.     

Hibernia地区地震深度偏移的优化及灵敏度分析

在深度偏移中要精确定位地震反射层需要精确的速度模型。在只有少量井约束条件下的区块，对速度的估计通常包括使用正常时差分析，地震旅行时层析坶成像，或是叠前深度偏移。这些可能是有效的，但也可能会是昂贵而费时的，在一系列与地以相交的井中，我们可得到一系列与地层顶部有关的信息。在此，我们运用最小平方优化方法来估计速度模型。用这种方法可以得到一些速度模型，对这些模型使用量小平方法根据井间条件，使深度偏移的地层     

Microstructure and frictional properties of 3D needled C/SiC brake materials modified with graphite

The 3D needled C/SiC brake materials modified with graphite were prepared by a combined process of the chemical vapor infiltration,slurry infiltration and liquid silicon infiltration process.The microstructure and frictional properties of the brake materials were investigated.The density and open porosity of the materials as-received were about(2.1±0.1)g/cm3and(5±1)%,respectively.The brake materials were composed of 59%C,39%SiC,and 2%Si(mass fraction).The content of Si in the C/SiC brake materials modified with graphite was far less than that in the C/SiC brake materials without being modified with graphite,and the Si was dispersed.The braking curve of the 3D needled C/SiC modified with graphite was smooth,which can ensure the smooth and comfortable braking.The frictional properties under wet condition of the 3D needled C/SiC modified with graphite showed no fading.And the linear wear rate of the C/SiC modified with graphite was lower than that of the C/SiC unmodified.     

硬质合金常用模压成形剂的热分解特性

成形剂热分解特性的研究是成形剂的选择与高效脱除工艺制订的基础。采用热重法(TG)、微商热重法(DTG)和差示扫描量热法(DSC)等热分析手段对石蜡、PEG与SBP等3大类别、7种型号的硬质合金常用成形剂的热分解过程进行研究。结果表明,不同类型的成形剂,其集中脱除温度和有效脱除温度范围等都有明显的差异。即便是同一类成形剂,其成分的微小差异也会导致其脱除行为的差异。在上述研究基础上对各种成形剂脱除工艺提出建议。     

TOD发展模式在当代中国城市建设中的应用--以理查德＆#183;罗杰斯的上海陆家嘴总体规划方案为例

TOD模式是以公共交通站点为核心建立包括商业、居住等功能复合的中高密度社区,并依此原则在公共交通节点上发展,在区域层面上形成有序的网络状布局。本文分析了TOD模式在中国城市发展建设中的应用。     

土样现场和室内剪切波速的试验研究

利用安装在动三轴仪上的剪切波速测试装置 ,测试了天津某地区土的剪切波速 ,并在此基础上将室内测试结果与现场测试值进行了比较。研究发现二者的差值与土层埋深、粘粒含量等因素有直接关系