直接斜率波前复原算法的控制效果分析

建立自适应光学系统功率谱抑制函数的概念，分析了采用直接斜率波前复原算法的自适应当光学系统的控制效果，理论分析与６１单元自适应光学系统上的实验结果表明，直接斜率波前复原算法将导致控制效果下降。     

差动光栅在精密测试中的应用

提出差动光栅概念,举例说明差动光栅在光纤面板刀口响应测试和材料形变自动监测系统等精密测试中的应用。     

Pulmonary vasoconstrictor effects of prostacyclin in rats: potential role of thromboxane receptors

Endogenous prostacyclin (PGI2; epoprostenol) is a potent endothelium-derived pulmonary vasodilator. However, the effects of exogenous PGI2 on isolated arteries could be either relaxant or contractile, depending on the species and organ studied. The present study investigated the distal pathways involved in the PGI2-induced contraction in rat intrapulmonary artery (PA) and relaxation in lamb PA. When vessels were precontracted with 30 mM K+, PGI2 (1 microM) induced relaxation in lamb PA but caused contraction in rat PA. Use of 30 mM K+, phenylephrine, serotonin, angiotensin II, or hypoxia to precontract the vessels did not alter the contractile effect of PGI2 in rat PA. Nevertheless, PGI2 produced a mild relaxation in rat PA precontracted by U-46619, a thromboxane A2 (TxA2)-receptor agonist, whereas the TxA2-receptor blocker SQ-29548 (0.1-0.5 microM) abolished the contractile response in rat PA. These data suggest that PGI2-induced contraction is mediated by activation of TxA2 receptors. The PGI2-induced modest relaxation in rat PA, which was only observed when TxA2 receptors were blocked by SQ-29548, suggests that the PGI2-mediated vasorelaxant pathway is diminished in these vessels. Simultaneous application of forskolin, an adenylate cyclase activator, and rolipram, a phosphodiesterase inhibitor, caused similar relaxation in both rat and lamb PA. This suggests that the adenosine 3',5'-cyclic monophosphate-dependent relaxing pathway is intact in rat PA and is comparable to that in lamb PA. On the basis of these data, we conclude that the pathways responsible for the paradoxical effects of PGI2 on rat and lamb PA are located upstream of the adenosine 3',5'-cyclic monophosphate-dependent relaxing pathway and that a paucity of PGI2 receptors in rat PA may be responsible.     

G.T.D. Analysis of radiation from magnetic line source on dielectric-coated cylinder

G.T.D. Analysis of the radiation from magnetic line source on a conducting circular cylinder with dielectric coating is presented. The G.T.D. solution is computed numerically by the residue series, Taylor series and the method of stationary phased in the shadow, transition and illuminated region, respectively. The numerical results of the G.T.D. solution show good agreement with the eigenfunction results.     

基于功能的数据箱管理系统的设计

本文介绍数据箱库ＢＯＸＤＢ的模型及数据箱结点结构，并给出它的数据管理方法，方法是一组以Ｃ编写的专用库函数。     

几种吸附式致冷新工质对的性能预测

应用吸附平衡基本理论对几种可能的吸附式致冷新工质对的性能进行了预测。结果表明，烷烃系列的低混点工质与沸石的配对体系是不可取的，而沸石－氨、活性炭－丙酮、活性炭－氨及活性炭－乙醇则是沸石－水、活性炭－甲醇体系的适宜的替代物。     

用COREX输出煤气生产直接还原铁

将Ｃｏｒｅｘ输出煤气用于直接还原铁（ＤＲＩ）的生产是该气体的最佳用途。该方案在技术上是可行的。其中ＣＯ２的脱除方法已成熟并有多种选择。据推断，煤气加热时不会产生严重析碳，所以不影响加热和还原。ＣＯ２脱除量大、产品碳含量高、还原速率下降及入口温度上升是还原工艺的主要特点。ＨＹＬⅢ工艺比Ｍｉｄｒｅｘ工艺更适于使用Ｃｏｒｅｘ输出煤气。用Ｃｏｒｅｘ输出煤气作还原气时能耗比使用天然气时高。     

PFC控制技术的一种改进方案

文章首先指出了目前ＰＦＣ所用控制技术的缺陷，然后提出了一各改进方案，并从理论分析和仿真验证的角度证明了改进方案的可行性和先进性。