明堂山隧道地应力量测及分析

通过对隧址区域构造定性分析和水压致裂法定量量测,分析明堂山隧道地应力分布和大小,依据目前常用高地应力判别方法,判定隧址区场地为低～一般应力区,为隧道设计提供了有力的地质依据。     

城市道路挖掘快速修复技术探讨

在市政设施施工工程中,采用传统的开挖、回填施工工艺,已经不能适应当前城市施工发展的需求。城市道路施工中最关键的因素是施工速度,尽早开放交通是城市道路挖掘修复的重点。所以,引入城市道路开挖回填新技术,可以将对城市交通、环境造成的影响降低到最小限度,并且提高了施工速度,是城市道路挖掘修复技术的发展方向。     

0号块现浇箱梁支架预压探讨

某工程采用反力法和堆载法相结合对支架进行预压施工,通过介绍支架预压的方法和措施,提出预压施工方案及采用简支梁以点代面的简化计算方法和作用力位置,以供同行参考和借鉴.     

国道施工图纸设计的核心要素分析

施工图纸是项目实施的总指导,施工图纸设计的质量影响着后期作业的效率高低。因设计条件有限,传统国道施工图纸设计方案存在诸多缺陷,既影响了正常的施工流程,也增大了国家投资公路建设的成本耗资。     

Biocompatibility evaluation of polyethylene terephthalate artificial ligament coating hydroxyapatite by fibroblasts cells in vitro

Hydroxyapatite (HA) based materials have been widely used in the field of ligament tissue engineering in the past decades. It has been previously reported that HA can increase the penetration of marrow-derived mesenchymal stem cells (MSCs) and MSCs cells into scaffolds due to increased cell differentiation in biological media. Additionally, it was found that there are much difference between MSCs and anterior cruciate ligament (ACL) cells. For that reason, we mainly evaluate the biocompatibility of polyethylene terephthalate (PET) silk scaffold with fibroblasts cells in vitro. We cultured mouse fibroblasts cells on the substrate of PET fiber and PET-HA scaffold, respectively, and then observed the morphology by using scanning electron microscopy. Our data indicate that PET-HA scaffold has good biocompatibility with fibroblasts cells and can potentially be useful in enhancing the fibroblasts cell differentiation and proliferation.     

Survey on arteriovenous fistula in maintenance hemodialysis patients with type 2 diabetic nephropathy

This paper summed up the characteristics of native arteriovenous fistulas (AVFs) in maintenance hemodialysis patients with type 2 diabetic nephropathy (DN) in Chinese hemodialysis centers. A survey was conducted on AVF in maintenance hemodialysis patients with type 2 DN. A total of 224 cases of maintenance hemodialysis patients were included in this study, among which, 65 cases in DN group, 33 cases in diabetes mellitus (DM) group and 126 cases in non-diabetic control (C) group. Hemoglobin, albumin, blood urea nitrogen, parathyroid hormone and calcium-phosphate product of the three groups of patients were not significantly different. Glycated hemoglobin A1c of DN group and DM group was not significant different. AVF life of (28.7 ± 10.0) months in DN group was significantly shorter than that of (36.5 ± 19.4) months in C group (statistic probability P <0.01), and AVF life of (32.5 ± 10.1) months in DM group (P <0.05) was also shorter than that in C group, while there was no significant difference in AVF life between DN group and DM group. Proportion of upper arm fistula in DN patients (11/65) was significantly higher than that in C group (6/123, P < 0.01). Life of AVF in patients with DN was relatively short, with more times of angioplasty and greater possibility of selecting upper arm internal fistula.     

一种汽车启动机智能保护装置的设计

汽车启动机属于汽车的易损坏部件之一.文中所设计的保护装置通过采集汽车点火开关信号、温度传感器信号、汽车变速箱信号、发送机转速信号等,利用AVR系列单片机为控制器,对启动机的电路通断状态、启动频率、启动持续时间等进行控制.保护装置能够有效保证启动机的工作环境和工作条件,避免误操作和过热造成的损坏,从而延长启动机的使用寿命,并保障汽车启动时的安全.     

拟“车-桥耦合系统”的动态近似分析法

目前对于车体通过桥梁的动力响应问题,通常是将车辆子系统和桥梁结构耦合为一个系统,同时进行分析.文中提出一种近似但具有足够精度的方法用以计算车-桥耦合系统的动力响应.将车-桥耦合方程分解为两个部分,忽略作用在桥梁上的由移动车辆产生的惯性力项,只剩下移动力项.计算出桥梁在移动力作用下的响应,并把此响应作为车体动力响应的激励源反馈给车体,从而计算出车体的响应.从数值计算的角度,采用MATLAB编程并与车桥耦合系统精确的数值解作对比,验证了轻车过重桥情况下本文方法的可行性.通过分析表明,此方法能避免车-桥耦合系统计算时的庞大运算.     

火山岩熔空洞地区高等级公路建设现状与展望

针对火山岩熔空洞地区公路建设相关研究成果,总结了火山岩熔空洞地区的形成过程及其物理、力学性质和工程特点,分析了火山岩熔空洞地区易产生的路基病害。在此基础之上,对该地区的公路建设进行了展望。     

中外大学生英语作文中带to不定式使用情况分析——一项基于语料库的研究

"带to不定式"是一条非常重要的英语语法项目,其句法功能丰富,大量出现在中外大学生的英语作文中。本研究以中国学习者英语语料库(CLEC)子库和LOCNESS英语本族语作文语料库中的子库提供的语料为依据,分析和总结中外大学生"带to不定式"的使用特点和分布差异。根据研究结果,教师可获得关于中国学生带to不定式习得的数据资料并可在相关领域的教与学中设置和调整教学策略。