Assessment of regional blood filling by using the rheoplethysmographic method combined with functional tests

Vascular responses of fingers and toes to the occlusion test as well as fingers, head, lungs and liver to the Valsalva maneuver were studied. The responses to the tests depended on the initial level of blood filling. The different level of blood filling was induced by orthostatic, head-down tilt and LBNP tests. It is recommended to use rheography (slow and pulse components) in combination with the occlusion test and Valsalva maneuver in order to assess regional blood filling and venous tone of crew-members in space flights.     

电导法测量保护渣结晶温度

为了解决现行保护渣结晶温度测量手段存在着各种不足的问题,提出了电导法的研究思路.在理论分析了液渣电导激活能与析出相成分、结晶率之间的关系后,设计出了一种简易的测量方法,并采用差热分析(DTA)、偏光显微镜和X射线衍射法对其相关的测量结果进行了验证.结果表明:该测量方法准确度高,成本较低,对主要析出相的判断基本正确,可作为保护渣结晶温度的新型研究手段.     

Study of the densification of refractory compound powders by the electrical conductivity method

Summary In this investigation, the electrical conductivity method was used for studying the compaction process of powders of titanium, zirconium, niobium, chromium, molybdenum, and tungsten carbides, titanium, zirconium, chromium, and tungsten borides, titanium and zirconium nitrides, and molybdenum and tungsten disilicides. In the pressure range investigated (5–75 kN/cm²), the densification process of the refractory compound powders is described by an exponential relationship between apparent electrical conductivity and relative volume. Following the example of [3], it is proposed that the degree of brittleness of refractory compounds be assessed from the tangent of the slope of the semilogarithmic straight line plot in In vs coordinates, and tentative conclusions are drawn regarding the relative brittleness of the materials whose powders were compacted in this investigation.     

多孔材料热导率通用计算方法

利用蒙特卡洛法对多孔材料的内部结构进行了重构,并验证了重构模型具有自相似性和标度不变性的分形特性.对重构的多孔材料模型进行网格划分,利用二值化原理识别网格中的固体基质和流体孔隙,构筑材料内部真实传热过程的串并联混合热阻阵列图,建立适用于各种均质和非均质多孔材料热导率的计算方法——二值化阵列法.基于该方法,对闭孔泡沫铝和硅酸铝耐火纤维材料的热导率进行了计算,并与文献中的实验测量值进行了比较,具有较好的一致性,验证了本方法的正确性和普适性.     

惰气熔融-热导法测定钛铁中氮

讨论了影响氧氮联测仪测定钛铁中氮的分析工作条件,采用惰气熔融-热导法测定钛铁中氮。结果表明:采用带盖镍囊包裹样品,在称样量和镍助熔剂加入量之比为1∶4.5,分析功率为5 000 W的条件下,应用纯硝酸钾建立氮的校准曲线,回归方程为y=0.924x-0.001 56,相关系数r=0.999 0。用本方法测定钛铁试样10次,得到的相对标准偏差(RSD)≤3.2%,加标回收率在97%～102%之间。     

Treatment of functional sterility using Clostylbegyt

Report of 39 patients suffering from functional sterility, having been treated with Clostylbegyt. Under analysis were the age of the patients, complications during therapy, time of ovulation and the effect of the drug on several ovarian caused difficulties of conception. Controlling examinations as well as the pregnancies obtained and their progress were discussed.     

脉冲熔融-热导法测定硅铁中氮

硅铁中氮的测定没有标准方法和相应的参考物质,本文通过以屑状钢中低氮参考物质建立氮校准曲线,采用镍箔助熔自动分析模式测定,建立了脉冲熔融热导法测定硅铁中氮的方法。对比了直接投样手动分析模式、添加石墨粉手动分析模式和镍箔助熔自动分析模式3种分析模式对氮的测定影响,结果表明,采用镍箔助熔自动分析模式测定硅铁中氮,氮释放完全、测试结果稳定。本方法的测定下限为0000 37%,用于2种硅铁样品中氮的测定,测定结果的相对标准偏差分别为10%和9%（n=4）。     

脉冲热导法测定车轴钢LZ50中痕量氢

应用RH-404氢测定仪,建立了脉冲热导法测定钢中痕量氢的分析方法.对影响氢测定的误差来源进行了探讨,有效地降低了空白值,选择了测定钢中痕量氢的最佳条件,取得了满意的结果.     

瞬态平面热源法测量材料导热系数

为了提高瞬态平面热源法的适用温度,介绍了瞬态平面热源法的测量原理.根据有限元法模拟了无膜平面热源加热过程中试样的温度分布,建立了相应的实验装置,测量了环境温度为27~829℃时材料的导热系数和热扩散率.结果表明在较高温度下该方法测量材料热导率是有效的,可用于实际测量.     

惰气熔融-热导法测定金属硅中氮

研究了用TC600氧氮测定仪测定金属硅中氮的最佳工作条件。结果表明:在称样量为0.10 g,分析功率为4 750 W,比较器水平为6的条件下测定,可以得到满意的分析结果。应用硝酸钾标准溶液建立工作曲线,曲线的回归方程为y=0.985 8x+0.000 017,相关系数r=0.999 8。用本方法测定金属硅试样10次,得到的相对标准偏差(RSD)≤4.3%,加标回收率在96.6%~108.2%之间。     

脉冲热导法测定金属中氦

设计快速接口除氢装置,将RH-404脉冲热导定氢仪转化成定氦仪.应用内置气标腔氦气标定,固体氮钢标验证计算过程.脉冲加热热导检测金属中氦,取得令人满意的结果.