定向越野跑训练对大学生心泵功能的影响

测定了24名定向越野跑运动员和32名普通大学生的心功能指标。并进行分析比较．结果表明。定向越野跑运动员每搏输出量(SV)、每搏指数(SI)、心输出量(CO)、心指数(CI)、左心室有效泵力(VPE)及指数(VPEI)显著高于普通大学生；而心率(P)、平均收缩压(MSP)、平均舒张压(MDP)、平均动脉压(MAP)较普通大学生低。提示高校定向越野跑训练对机体心血管机能有良好的作用，适于在高校开展．     

催化裂化塔底泵设计的关键技术

根据催化裂化装置的要求，介绍了塔底泵(油浆泵)的结构特点，重点阐述了油浆泵水力及结构设计的关键技术。     

水压柱塞泵配流副闭死容积的计算机仿真研究

柱塞配流是柱塞泵的一种新型配流机构，它具备端面配流和阀配流泵的优点，同时又避免了两者的缺陷，其应用前景十分看好。闭死容积的研究是柱塞配流纯水液压泵的关键技术之一，本文主要研究了：闭死容积密封长度的确定；水过程的作用时间；配流过程数学模型的建立与仿真。其结果有助于泵配流机构的正确设计。     

基于关联维数的输油泵运行状态研究

给出关联维数的计算方法及参数的选取依据,研究了输油泵在不同状态下的关联维数,给出了获得其真实状态的关联维数方法。结果表明,关联维数可以作为识别输油泵运行状态的特征量。     

PVC管材管件配混生产线控制系统

利用计算机监控技术、齿轮泵和螺旋加料器的变频调速技术、称重值模糊控制技术、气力输送技术以及生产流程的动态监控显示技术研制开发的PVC管材管件配混生产线控制系统,提出了将一种原料称重的过程,根据具体情况分成4个称重阶段后再分别细化处理,同时还考虑了输送管路尾端余量等随机参数的自适应称重控制程序,并给出了程序设计的步骤和程序的框图。成功地解决了PVC原料配混生产中粉尘处理、减振处理,改善了工作环境,减少了化学原料粉尘对人体的危害,提高产品质量和工作效率等诸多问题。实践证明：该系统在本行业和相关的行业中应用具有显著的经济效益和社会效益。     

一类活塞式二热源热泵的最优性能

研究了一类以理想气体为工质，热交换过程不可逆的活塞式二热源热泵，并设其中曲柄作匀速转动。导出热泵的基本优化关系，并应用它讨论了热泵的各种优化性能，获得了一些对热泵的优化设计和运行均有指导意义的新结论。此外，还强调了有限时间热力学的理论方法及其重要意义。     

Polymorphonuclear leukocyte mediated oxidative inactivation of alpha-1-proteinase inhibitor: Modulation by nitric oxide

Alpha-1-proteinase inhibitor activity was studied in presence of resting and activated polymorphonuclear leucocytes. Four different agonists; phorbol myristic acetate, N-formyl-methionyl-leucyl-phenylalanine, opsonised zymosan and arachidonic acid decreased the inhibitor activity by 23.3%, 20%, 12% and 16.6^ respectively. The inhibitor activity was protected by using various free radical scavengers. Catalase and superoxide dismutase both restored activity by about 18%, mannitol by 13% and sodium azide by 17.3%. The inhibitor activity was also protected significantly by pretreatment of polymorphs with L-Arg, a precursor of nitric oxide, before activation. L-Arg was also observed to suppress the generation of superoxide and hydroxyl radical appreciably. The nitric oxide synthase inhibitor, aminoguanidine drastically inhibited the nitrite release and reversed the protection offered by L-Arg to the inhibitor activity. Our results indicate a multifactorial nature of the inactivation process, the culprit species being superoxide, hydrogen peroxide, hydroxyl radical and hypohalides. Nitric oxide seems to scavenge the superoxide radical directly after its formation rather than inhibiting its generation by NADPH oxidase as was believed earlier.     

老年缺血性脑卒中患者血清载脂蛋白与组织型纤溶酶原激活剂及其抑制物的相关性

目的：探讨载脂蛋白A1、B100与老年缺血性脑卒中患者组织型纤溶酶原激活剂（t—PA）及其抑制物（PAI）活性的关系。方法：对52例老年缺血性脑卒中患者和50例健康人用免疫比浊法测定血清载脂蛋白A1、B100浓度，并以发色底物法测定血浆组织型纤溶酶原激活剂及抑制物的活性。结果：老年缺血性脑卒中患者载脂蛋白B100，纤溶酶原激活剂抑制物的活性显著高于对照组（P〈0．05和P〈0．01），载脂蛋白A1与组织型纤溶酶原激活剂均降低（P〈0．05和P〈0．01），相匹配的缺血性脑卒中及对照组19例的相关分析发现载脂蛋白B100与组织型纤溶酶原激活剂活性无关，而与纤溶酶原激活剂抑制物活性呈正相关（r=0．8330），载脂蛋白A1与纤溶酶原激活剂抑制物活性呈负相关（r=-0．6734）。结论：载脂蛋白A1、B100浓度与纤溶酶原激活剂抑制物活性之间存在相关关系，而载脂蛋白B100与纤溶酶原激活剂抑制物呈正相关，载脂蛋白A1与纤溶酶原激活剂抑制物活性呈负相关。     

Anticoagulation therapy in intra-aortic balloon counterpulsation: Does IABP really need anti-coagulation?

Objective: To investigate if intra-aortic balloon pump(IABP) is contraindicated without anticoagulation therapy. Methods: Some 153 IABP patients in the King Abdulaziz Cardiac Center(KSA) were randomly assigned into two groups. Anticoagulation group (Group A) consisted of 71 patients who were given heparin intravenously with target aPTT50–70 seconds. Non-anticoagulation group (Group B) consisted of 82 patients without intravenous heparin during balloon pumping. Hematological parameters including platelet count, D-dimer, Plasminogen activator inhibitor-1 (PAI-1) and fibrinogen degradation products (FDP) were checked respectively at the point of baseline, 24 hours, 48 hours and 24 hours post IABP counterpulsation. Clot deposits on balloon surface, vascular complications from IABP including bleeding and limb ischemia were recorded. Results: Platelet count and PAI-1 level decreased at 24 hours and 48 hours in both groups (P<0.05). D-dimer dimer and FDP level increased at 24 hours and 48 hours in both groups(P<0.05), but returned to the baseline level 24 hours post IABP removal (P>0.05). Three patients in Group A and 2 patients in Group B developed minor limb ischemia (P>0.05). No major limb ischemia in either group. Two patients in Group A suffered major bleeding and required blood transfusion or surgical intervention, whereas no patient had major bleeding in Group B. Eight patients had minor bleeding in Group A, but only 2 patients in Group B (P<0.05). No clot deposit developed on IABP surface in either group. Conclusion: IABP is safe without routine anticoagulation therapy. Selecting appropriate artery approach and early detection intervention are key methods for preventing complications.     

针对偏心螺杆泵吸排口反接之浅析

在污水处理行业中,偏心螺杆泵是一种比较常见及重要的设备,主要用于输送的介质有生污泥、消化污泥以及浮渣等。偏心螺杆泵吸、排口反接后会给泵在运行上带来一些不良因素及危害,特别是对轴密封及连接轴等传动件的损害,从而导致设备出现介质输送泄漏、工作效率下降及使用寿命缩短等一系列不良后果。因此,偏心螺杆泵的使用安装最好严格按照吸、排口要求正确安装。