高聚物化学网构改性沥青混合料路用性能室内试验研究

高聚物化学网构改性沥青是在沥青中通过活性剂使分散在沥青中的高聚物分子发生化学反应，使高聚物分子链之间以化学键的形式形成强有力的三维空间网状结构．沥青与高聚物改性剂组成一个互穿网络相结构的混合物。本文选用AH-70号普通沥青、以其为基质沥青生产的两种SBS改性沥青(SBS材料品种不同)、PE改性沥青、化学网构改性沥青和国外某改性沥青等6种沥青，以及AK16、SMA16两种沥青混合料进行系统室内试验对比研究．考察混合料的路用性能。试验研究表明．高聚物化学网构改性沥青混合料的强度、高温稳定性、低温抗裂性、疲劳性能、水稳定性能和抗油浸蚀能力等较原普通沥青都有不同程度地提高，且比用同一基质沥青改性的PE改性沥青、两种SBS改性沥青和国外某改性沥青综合性能优越，是适合高等级公路建设需要的一种优良的新型改性沥青。     

故障检修与排除实例（6）

故障现象：一辆大阳牌DY125型三轮摩托车的充电系统发生故障，不能有效给蓄电池充电，导致蓄电池严重亏电，电起动不能正常工作，故障原因不明。     

摩托车启动轴断裂原因浅析

维修中发现,摩托车启动轴易断裂的车辆是:GY6机125、150;C100扩缸110、125.其它车型也可能出现上述故障,但原因大不相同,笔者根据多年的维修经验作一浅析,与大家共勉.     

富勒RT-11509C型变速器为什么没有高速挡

故障现象:一辆延安SX2190型越野汽车,行驶不到3000公里,变速器就出现了有低速挡、无高速挡的现象。故障检查:根据故障现象,判     

故障检修与排除实例(16)

故障147 故障现象:一辆建设JS125-6B型摩托车,行驶途中熄火,不能再起动,故障原因不明. 故障诊断与检修:摩托车在行驶途中,发动机熄火后不能再起动有2种可能,即点火电路或油路出现故障.     

故障排除实例

实例 故障现象：一辆嘉陵JH70摩托车经维修工更换汽缸、活塞、活塞环后。加速、行驶均无力。且炎热天气需关闭风门才能启动。     

2014款雪佛兰Aveo更换前轮轴承后 ABS异常

正故障现象一辆2014款爱唯欧Aveo,行驶了56 456km,因前轮轴承异响而送修,在更换了右前轮轴承后,车主发现ABS灯常亮,而且在行驶中踩制动踏板,会明显感觉到踏板出现振动、弹脚,且伴有"咯咯咯"的响声,因而再次送修。故障诊断与排除接车后,首先试车并验证故障现象,确实如车主所述,ABS指示灯常亮,且制动过程中ABS误启动。连接专用检测仪,发现系统存有历史故障码"DTC C1226 00:右前轮速传感器电路性能故障"。拆下右前轮轮速传感器并进行检测,未见异常。清除故     

基于探坑法的路面结构病害测试方法研究

路面病害种类多,形成原因复杂且难以分辨,且现行路基路面测试规范缺少相关测试方法,文中借鉴考古挖掘中使用的探坑测试方法,在对测试原理分析和典型病害现场试验的基础上,提出基于探抗法的路面结构病害测试方法,用以指导路面结构病害原因分析。     

Relationship between the acid-suppression efficacy of proton pump inhibitors and CYP2C19 genetic polymorphism in patients with peptic ulcer

Obiective To investigate acid-suppression efficacy of proton pump inhibitors(PPls) in relation to CYP2C19 genetic polymorphism on patients with peptic ulcer. Methods By an open, randomized and control trial, fifty nine patients with active peptic ulcer were randomly assigned to receive one of three PPIs on a single dose (20 mg of each drug): omeprazole group (n=19), rabeprazole group (n=20) and esomeprazole group (n=20). lntragastric pH was recorded 1 hour before and 24 hours after administration. CYP2C19 genotype was tested in all patients. Resuits The EMs/PMs ratio of each group was 16/3,17/3 and 17/3, respectively. The total time that intragastric pH＞4, time percent pH＞4 and median pH in PMs patients were significantly higher than those in EMs patients of omeprazole group (P＜0.05). But all these differences were not found in rabeprazole group and esomeprazole group. The pH of nocturnal acid breakthrough (NAB) in both rabeprazole group and esomeprazole group was higher than that of omeprazole group, while there was no significant difference between rabeprazole group and esomeprazole group. Gonclusion The acid-suppression efficacy of omeprazole is highly dependent on CYP2C19 genetic polymorphism, while CYP2C19 genetic polymorphism may have a little influence on the acid-suppression efficacy of rabeprazole and esomeprazole. The acid-suppression action of rabeprazole and esomeprazole is superior to omeprazole, especially on night acid secretion.