发电厂相变干冷排热系统优化与不确定性分析初探

通过火力发电厂相变空气干式冷却排热系统的热经济学分析，提出了相变干式冷却系统优化的目标函数和优化参数，利用数值计算的可变容差法进行优化计算，取得了满意的结果，为了保证优化在可变经济环境的可靠性动力稳定性， 对优化结果进行了不确定性分析。     

软件补偿方法在测温智能仪表中的应用

软件补偿方法具有效果好、精确度高、成本低的优点。介绍了在研制多点巡回检测仪中采用的几种软件补偿方法：前向通道特性补偿使放大器等元件不因外界条件的变化而受到任何影响；引线电阻的补偿可实现引线电阻对系统无任何影响；热电阻、热电偶的非线性度补偿效果明显，节省开销。     

距离数字显示在脉冲超声多普勒血流检测中的应用

1 工作原理及电路组成图给出电路原理框图.以工作发射频率为时钟脉冲,调制脉冲作为闸门开启时间,将调制脉冲予以延迟作为接收信号的选通脉冲来关闭闸门,这个时间就是声脉冲从换能器发射到采样点,再回到接收换能器所经过的时间,用这个时间来控制时钟脉冲予以汁数、寄存、译码,以数字形     

Ca2+ release induced by inositol 1,4,5-trisphosphate is a steady-state phenomenon controlled by luminal Ca2+ in permeabilized cells.

Low concentrations of inositol 1,4,5-trisphosphate (InsP3) evoke a very rapid mobilization of intracellular Ca2+ stores in many cell types, which can be followed by a further, much slower efflux. Two explanations have been suggested for this biphasic release. The first proposes that the Ca2+ stores vary in their sensitivity to InsP3, and each store releases either its entire contents or nothing (all-or-none release); the second proposes instead that the stores are uniformly sensitive to the effects of InsP3, but that they can release only a fraction of their Ca2+ before their sensitivity is somehow attenuated (steady-state release). Experiments using purified InsP3 receptor molecules reconstituted into lipid vesicles have shown heterogeneity of the receptors in their response to InsP3 under conditions in which the total Ca2+ level at both sides of the receptor is held constant. We now report that in permeabilized A7r5 smooth-muscle cells incubated in Ca(2+)-free medium, the amount of 45Ca2+ remaining in the stores after the rapid transient phase of release is independent of their initial Ca2+ levels, indicating that partially depleted stores are less sensitive to InsP3. Moreover, if the stores are reloaded with 40Ca2+ after the first stimulus, reapplication of the same low concentration of InsP3 will release further 45Ca2+. This recovery of InsP3 sensitivity is almost complete. Under these conditions, Ca2+ release must thus occur by a steady-state mechanism, in which the decreasing Ca2+ content of the stores slows down further release.     

Trying times for human insulin.

The introduction of human insulin to treat diabetics seemed straightforward. What can account for the problems that have followed?     

丙酮缩二甲醇的合成及应用

介绍了丙酮缩二甲醇的合成方法及其主要用途,概要地报道了合成丙酮缩乙二醇及以此为原料合成丙酮缩二甲醇的新工艺。     

三球式和转台式角动量守恒演示器的研制与应用

本文详细介绍了笔者研制的三球式和转台式两种新型角动量守恒演示器的结构、特点和使用方法。     

球电流壳磁场的计算

计算的结果表明，球壳内的磁场是均匀的，可用此方法在一定范围内获得均匀磁场．