橡胶沥青在兰州新区市政道路中的应用分析

以兰州新区祁连山大道路面改造为主线,介绍了橡胶沥青的原理及优缺点,通过工作实践分析橡胶沥青混凝土在道路施工中的应用及橡胶沥青混凝土拌和料用料的技术指标、橡胶沥青混凝土的拌合、摊铺、碾压等施工工艺。在橡胶沥青混凝土改善路用性能和节能环保等方面进行了有益的尝试。     

STRATA应力吸收层在我国的首次应用

结合工程实践，介绍STRATA应力吸收层的施工工艺。针对湖北夏天炎热冬天寒冷的气候特点，建议高等级公路罩面优先选择STRATA应力吸收层。     

橡胶沥青应力吸收层的效益分析

废胶粉在公路工程中应用范围很广,通过对橡胶沥青应力吸收层、聚酯玻纤布应力吸收层和乳化沥青封层三种施工工艺的经济效益进行计算和对比,并详细介绍橡胶在沥青应力吸收层中的应用,对于解决社会环保问题、提高道路的经济效益具有重要意义。     

橡胶沥青SAMI应力吸收层的性能研究

从半刚性基层特性出发,通过对层间粘结力的力学分析和剪切、拉拔、疲劳试验的研究,详细论述橡胶沥青SA—MI应力吸收层的特点、设计方法和施工工艺,可得出橡胶沥青SAMI应力吸收层能增强层间粘结效果,提高路面结构的整体性．同时又能更好地减少和防止反射裂缝产生的结论。     

能量吸收法在高速铁路舒适性评价中的应用

在综合各国高速铁路舒适性评价标准中的先进经验的基础上,作者在振动及加速度等有关的动力学范畴内进行舒适度讨论。通过对影响舒适度的四个因素,振动频率、振动强度、振动方向和振动暴露时间的分析,并结合车辆平稳性测量,应用能量吸收评价法,建立起耗散于人体中的振动能量与人的主观感觉之间的关系,为高速铁路乘坐舒适性评价研究开辟了新的思路。     

橡胶沥青同步碎石应力吸收层的设计研究

针对橡胶沥青同步碎石应力吸收层的使用特性,在McLeod经验设计法的基础上,提出了以抗剪强度作为力学设计指标,并形成了橡胶沥青同步碎石应力吸收层的力学—经验设计法,同时给出设计示例;对采用两方法设计的应力吸收层进行了性能对比。研究结果表明:力学—经验法设计能设计出具有更高的抗剪强度、抗拉强度和动稳定度的同步碎石应力吸收层,值得推广应用。     

电磁波在大气非平衡等离子体中的吸收

采用平板模型对入射电磁波在大气非平衡等离子体中的吸收特性进行了数值模拟,着重研究了大气中的负离子的存在、外加磁场以及碰撞频率等因素对电磁波吸收的影响,并给出了相关参数的数值模拟结果.     

THE STUDY ON THE CHANGES OF ZINC, COPPER, CALCIUM AND MAGNESIUM IN PLASMA AND ERYTHROCYTES DURING CARDIOPULMONARY BYPASS

Objective To study the changes and their influence factors involved of zinc, copper, calcium and magnesium in plasma and erythrocytes during cardiopulmonary hypass(CPB). Methods Zinc, copper, calcium and magnesium values in plasma and erythrocytes were measured by atomic absorption spectrophotometer during CPB. Results Zinc and copper levels in plasma were significantly elevated above preinduction level before perfusion, hut calcium and magnesium levels did not change significantly; zinc, copper and calcium levels in plasma were significantly below preoperation level during CPB, hut magnesium level in plasma was significantly increased above preoperation; zinc level in plasma was increased to preoperation level after CPB and began to decrease again at 8 hours after CPB,copper level in plasma was increased to preoperation level at 20 hours after CPB, calcium in plasma was increased significantly from beginning to 8 hours after CPB, magnesium level in plasma was decreased to preoperation level at 8 hours afterCPB. Concentration of zinc , copper, calcium and magnesium in erythrocytes did not change significantly. Conclusion During CPB, the changes of zinc, copper, calcium and magnesium had relation to hemodilution, operative wound, carrier protein, stress and component of priming Solution and cardioplegic solution, hut no relation to transferfrom plasma erythrocytes. The results indicate that it is beneficial to patient‘s recovery to supplement zinc, copper, calcium and magnesium properly by different ways during cardiac perioperation.     

米场铁路工区饮用水井汞污染源调查

利用自制的石英窗管在原子吸收光谱仪上作冷原子吸收法测汞,对经多次检验定为含汞量超标的柳州铁路局米场工区的饮用水井作了调查。认为该工区饮用水井周围确有污染源存在,建议工区的饮用水应在严格管理下使用。本实验方法1％吸收检出限为0.41μg/L,相对标准偏差为11.3％。