化学工程与工艺化工生产控制自动化及仪表研究

随着社会经济的快速发展,对化工生产的需求越来越大,生产也越来越智能化、自动化.作为国民经济生产的重要产业,化工的发展离不开人们的生活,为了促进化工的全面发展,生产必须实现全自动化.自动化需求主要体现在仪表和控制水平上,本文主要分析了仪表自动化生产的主要类型化工产品.     

再生混凝土研究现状

随着经济的发展我国各地的城市化进程不断加快,新型建筑大量兴起旧建筑物被大面积的拆除。从这些旧建筑上拆除的废弃混凝土占据了大量的土地资源的同时也污染了环境。如何处理废弃混凝土已经成为各个城市所必须面对的问题。城市要实现可持续发展的必须将废弃混凝土重新回收利用。     

双燃料发动机电子控制系统的设计

本文对设计的双燃料发动机电子控制系统的硬件结构，软件模块，控制方式及用途进行了详细介绍，并对天然气喷射器流量做了试验。     

Serum concentrations of laminin and fibronectin in patients with acute coronary syndromes

Objective To study the serum iaminin (LN) and fibronectin (FN) changes in acute coronary syndromes (ACS), and explore the role of them in assessing the severity of ACS. Methods This study included 46 ACS patients [25 with acute myocardial infarction (AMI) and 21 with unstable angina (UA)], 51 stable angina (SA) patients and 47 people without CHD as controls. Serum levels of LN, FN, fibrinogen and blood fat were assessed. Coronary angiography were performed on 49 of them. Results The serum concentration of LN was lower in ACS patients [(85.20±27. 57)ng/mL], higher in SA patients [(116. 80 ± 28. 80)ng/mL] as compared to that in the control group [(100.06±29.96)ng/mL], with significant difference among the groups (P<0.05). No difference was found in FN among the three groups. However, the subgroup analysis in the group with ACS showed that the serum concentration of FN was significantly higher in UA patients [(229.60±121.39)μg/mL ], and lower in AMI patients [(108.31±47.12) μg/mL ]. The serum LN and FN concentration could respectively enter the logistic regression equations of ACS patients and US patients. Neither LN nor FN concentration was correlated with narrowing of coronary artery of angiography. Conclusion Serum LN and FN level may be a useful indicator for stability of atherosclerosis plaque in coronary arterial disease patients, but could not predict the extent of narrowing in coronary angiography.     

轴瓦紧余量测量装置

介绍了手动液压式轴瓦紧余量测量装置的原理、结构、使用方法、并对其误差进行了分析。该装置结构简单、使用方便、测量精度高，具有较好的应用效果。     

非规则铁路连续梁桥抗震体系优化

从非规则铁路连续梁桥各桥墩协同抗震的角度,引入墩底摇摆隔震及支座减隔震,以1座(60+100+60)m连续梁桥为例,建立全桥动力分析模型进行地震反应分析,研究具有中等高度(20~30m)实心桥墩的非规则铁路连续梁桥采用摇摆隔震的适用性,以及全桥采用支座减隔震时的桥墩优化配筋准则。结果表明:采用摇摆隔震时,摇摆墩墩底恒载轴力大,提离位移敏感性高,地震作用下墩顶位移可控制在较小的范围且提离后墩底弯矩变化稳定,易随其余各墩协同抗震,经抗震性能验算确定摇摆墩配筋率为0.6%;采用支座减隔震时,桥墩本身地震反应贡献率最高可达71%,桥墩惯性力主控墩底内力,以地震作用下各墩同步保持弹性为原则,优化后各墩配筋率依次为0.7%,0.3%,0.5%和0.7%。以上2种优化均可使非规则铁路连续梁桥达到"大震不坏"的设防水平。     

绝对式智能航向数字化处理系统

文章介绍了陀螺罗经航向信号数字化处理系统的软、硬件结构、数字航向的显示，罗经性能参数的测试方法 。     

优质级配砂的开发与应用

在级配不良的天热移中，按适当比例配人一部分选定粒级的人工机制砂，可以得到级配良好，空隙率小，性能优良的建筑用细集料，谓之优质级配砂。用选种砂配制砂浆与混凝土，和易性好，粘结力强，密实度高，强度也高，而价格较低，有较好的开发前景。