汽轮发电机转子中心测量中的误差分析

对汽轮发电机转子中心测量中的误差变化规律进行了分析。对于传统的百分表四点测量的方法,测量数据的主要误差是测量位置停位不准产生的误差和测量表架变形产生的误差。而测量表架变形产生的误差具有数值大,不能用有效性进行检验的特点,对测量精度影响较大,在汽轮发电机转子找中心时应特别注意。     

发光分析在中药药理研究中的应用

将发光分析技术应用于中药药效学及机理方面的研究,结果表明:具有抗流感病毒作用的中药克感利咽口服液和抗心梗注射液等药物均显示良好的清除活性氧(包括氧自由基)作用,克感液抗流感病毒具有降低机体氧化应激态的作用机制.     

索赔到达间隔为几何分布风险模型的破产问题

讨论了索赔到达间隔时间服从几何分布,索赔额分布为一般离散型分布的一类连续时间风险模型的破产问题,先将风险模型纳入PDMP框架,借助于带离散分量的广义生成元的概念得到相关鞅,再利用测度变换理论得到破产概率的一般表达式,有趣的是破产函数不是连续的,而是逐段常值的.     

NO—O复合反应速率的激波管测量

本文叙述了用激波管测定NO—O复合反应速率的原理和方法。在激波速度为2.2公里/秒、试验气体密度ρ_5/ρ_0=2.0时,测定波长为400～900nm范围内,反应速率常数是2.85×10~(-14)厘米~3·分子~(-1)·秒~(-1)。     

制氧机操作阀的最佳调节

我们采用正交实验设计法确定制氧机调节阀的最佳阀位,最佳的标准是极大限度地提高氧气提取率。本文介绍了在一台6000m~3/h制氧机上进行实验的实际做法。实验分析和实际使用结果表明,按照所确定的最佳阀位进行调节,氧气提取率的提高是相当显著的。     

Biochemical events associated with rapid cellular damage during the oxygen-and calcium-paradoxes of the mammalian heart

Summary The O_2– and Ca²⁺-paradoxes have a number of features in common and it is suggested that release of cytosolic proteins in both paradoxes is initiated by the activation of a sarcolemma NAD(P)H dehydrogenase which can generate a transmembrane flow of H⁺ and e^– and also oxygen radicals or recox cycling which damage ion channels and membrane proteins (phase I). Entry of Ca²⁺ through the damaged ion channels then exacerbates the damage by further activating this system, either directly or indirectly, and the redox cycling and/or oxygen radicals cause further damage to integral and cytoskeletal proteins of the sarcolemma resulting in microdamage to the integrity of the membrane (phase II) and the consequent release or exocytosis of cytoplasmic proteins and, under specialised condition, the blebbing of the sarcolemma. The system may be primed either by removal of extracellular Ca²⁺ or by raising [Ca²⁺]_i by a variety of measures, these two actions being synergistic. The system is initially activated in the Ca²⁺-paradox by the membrane perturbation associated with removal of extracellular Ca²⁺; prolonged anoxia in the metabolically active cardiac muscle causes a depletion of the ATP supply, particularly in the absence of glucose, and hence a rise in [Ca²⁺]_i in phase I of the oxygen paradox with the consequent activation of the NAD(P)H oxidase at the sarcolemma. Oxygen radicals are probably generated in both paradoxes and may have a partial role in the genesis of damage, but are not essential in the Ca²⁺-paradox which continues under anoxia. Massive entry of Ca²⁺ also activates an intracellularly localised dehydrogenase (probably at the SR) which produces myofilament damage by redox cycling.     

温热挤压成形工艺技术在氧枪喷头中的应用

对氧枪喷头产品关键零件结构及技术性能要求进行工艺技术分析,采用MARC/Autoforge软件对不同坯料的挤压过程进行模拟,获取了毛坯及模具结构的优选参数,通过试验分析确定了温热挤压成形工艺方案.     

应用自然发火实验研究煤的自燃倾向性指标

以３种不同变质程度煤样的自然发火实验为基础，通过对表征煤自燃特性参数的测算，分析了它们与煤自燃倾向性的关系，并提出用临界温度、煤耗氧速度、ＣＯ产生率和氧转化为ＣＯ的百分率作为鉴定煤自燃倾向性的指标，是有一定参考价值的。