地铁9号曲尖轨道岔区建筑限界加宽量计算

限界计算是地铁工程设计过程中较为繁琐的一项工作,直接关系到车辆运行安全。针对天津地铁6号线工程中应用9号曲尖轨道岔的情况,综合考虑车辆在道岔侧股运行时的几何偏移量、欠超高引起的动态偏移量、曲线轨道参数及车辆参数变化引起的车体横向位移量,计算并拟合B型车道岔区建筑限界加宽量图,为道岔区土建、结构设计提供理论依据。计算结果表明:B型车道岔外侧建筑限界加宽始于岔心前端25.75m处,最大加宽量为166 mm;道岔内侧加宽始于岔心前端22.55 m处,最大加宽量为429 mm。     

9机牵引道岔控制电路分析

分析了9机牵引道岔控制电路,阐述了9机牵引单动、双动道岔的启动过程及故障情况下的安全防护措施,并结合实际使用过程中出现的问题与现象提出可行的解决方案。     

EXPRESSION OF IL-2 AND SIL-2R AND ALTERATION OF CELL IMMUNITY IN PATIENTS WITH HYPERTENSIVE CEREBRAL HEMORRHAGE

Objective To study the expression of interleukin-2 （IL-2）, soluble interleukin-2 receptor （sIL-2R）, determine the alteration of erythrocytic immunity and T cell subgroup in the blood of outer circulation in patients with hypertensive cerebral hemorrhage so and to probe into the relationship between them, and to explore the clinical significance. Methods Enzyme linked immnunosorbent assay （ELISA） was used to determine the content of IL-2 and slL-2R. The immunoadsorption was employed to examine the erythrocytic immune activity and its regulating function. （ S-P） was used to determine the cell number of CD3 （cluster of differentiation3）, CD4 and CD8. Resolts The content of IL-2 in the group with hypertensive cerebral hemorrhage was significantly lower than that in the control group （P〈0.01）, and the content of sIL-2R increased. Red blood cell C3b receptor （RBC. C3bR） and RBC immune adherence enhancing factor （RFEB） dropped greatly （P〈0.01）, while RBC immune complex rosette （RBC. ICR） and RBC immune adherence inhibiting factor （RFIR） increased greatly. The cell number of CD3 and CD4decreased （P〈0.01） and there was no obvious change in CD8 （P〈 0. 05）. Conclusion The decrease of immune function was observed in patients with hypertensive cerebral hemorrhage. The determination of the content of IL-2, sIL- 2R, erythrocytic immunity and the activity of T subgroup has an important clinical significance in the occurrence, development, treatment, and prognosis of hypertensive cerebral hemorrhage.     

DETECTION OF PLASMA SOLUBLE INTERLEUKIN－2 RECEPTOR IN PATIENTS WITH SEVERE AND CHRONIC ACTIVE HEPATITIS B

ＤＥＴＥＣＴＩＯＮＯＦＰＬＡＳＭＡＳＯＬＵＢＬＥＩＮＴＥＲＬＥＵＫＩＮ－２ＲＥＣＥＰＴＯＲＩＮＰＡＴＩＥＮＴＳＷＩＴＨＳＥＶＥＲＥＡＮＤＣＨＲＯＮＩＣＡＣＴＩＶＥＨＥＰＡＴＩＴＩＳＢＺｈａｎｇＳｈｕｌｉｎ；ＷｕＧｕａｎｇｌｉ；ＹａｎＹｕｌａｎ；Ｃｈｅ...     

微血管密度和基质金属蛋白酶-9的表达与胶质瘤病理分级的关系

目的　探讨微血管密度 (MVD)和基质金属蛋白酶 9(MMP 9)的表达与人脑胶质瘤恶性程度及预后的关系。方法　采用免疫组织化学SP法检测 5 8例不同病理分级的人脑胶质瘤及 10例正常脑组织标本中MMP 9和CD3 4 的表达 ,测定其阳性细胞数和阳性血管数。结果　胶质瘤中MMP 9表达于肿瘤细胞胞浆和血管内皮细胞 ;不同病理分级胶质瘤中MMP 9阳性表达率分别为Ⅰ级 4 2 .9% ,Ⅱ级 6 5 .0 % ,Ⅲ级 86 .7% ,Ⅳ级 88.9% ,显著高于正常脑组织 (P<0 .0 1) ,且与胶质瘤恶性程度呈正相关 (rs=0 .5 97,P <0 .0 5 ) ;不同病理分级胶质瘤中MVD存在显著性差异 (H =4 7.86 5 ,P <0 .0 5 )。结论　MVD和MMP 9的表达与胶质瘤恶性程度密切相关 ,可作为临床判断胶质瘤恶性程度、侵袭性及预后的重要指标。     

基于虚实融合技术的V2X测试系统研究

针对网联汽车在进行V2X功能实车测试成本高、危险性高、对场地要求高等问题,以被测车辆V2X车载单元为主要测试对象,开发一套基于虚实融合技术的V2X测试系统,依托PreScan及MATLAB软件搭建测试场景,背景车辆及路侧信息为虚,被测车辆为实,虚实结合构建了完整的V2X功能实车验证环境。以某车型搭载的V2X车载单元为被测对象,在测试系统中搭建了交叉路口碰撞预警验证环境进行试验,试验结果证实测试系统能够在保证测试安全的前提下进行V2X功能有效性的判断。     

Resilience in transportation systems: a systematic review and future directions

ABSTRACT

The Belt and Road (B&R) initiative was introduced by the Chinese government to promote the worldwide economic development and multilateral cooperation between China and the associated countries. As a crucial part of global supply chains, transportation plays a key role to ensure the implementation of the B&R. Safety is one of the issues with great importance in transportation research. However, its foci have been expanded from traditional risk through security to resilience and sustainability. Resilience has attracted considerable interests from both researchers and practitioners across different research domains in recent years. Various studies have been conducted on transportation resilience from different perspectives. Consequently, different definitions have been developed to define and describe resilience. This paper presents a systematic review on transportation resilience with emphasis on its definitions, characteristics, and research methods applied in different transportation systems/contexts. It aims to figure out what transportation resilience is and what kind of essential characters it usually has. More importantly, research challenges are analysed and a future research agenda on the resilience of transportation systems is proposed. This paper will provide comprehensive insights into understanding the transportation resilience, as well as establish new horizons for relevant research topics within the context of the B&R.     

基于损伤退化模型的钢筋混凝土梁式桥加固计算方法研究

为了客观反映材料退化、结构损伤、运营环境变化及结构工作状态改变等因素对桥梁承载能力的影响,分析了桥梁加固计算的特点,给出了基于损伤退化模型的钢筋混凝土梁式桥正截面及斜截面承载能力计算公式,提出了结构加固计算的一般步骤,并以工程实例给出了具体应用方法。     

东风汽车公司商用车发动机的研发历程

介绍了东风汽车公司几款有代表性商用车发动机的研发过程,阐述了东风汽车公司在发动机研发领域贯彻＂改进一代、开发一代、预研一代＂的方针,坚持技术创新,走自主研发与技术引进相结合,开展商用车发动机研发的历程,对我国汽车行业的发展路线有借鉴意义。     

Changes in the external costs of freight surface transport In Spain

This paper studies the external costs of surface freight transport in Spain and finds that a reduction occurred over the past15 years. The analysis yields two conclusions: trucks have experienced a reduction in external costs, and rail has lower externalities. The external costs of road freight transport decrease between 1993 and 2007 (44%). The external costs of rail freight increase by 12%. During this period, the external costs of road freight related to climate increase by 16%, oppositely than those from air pollution and accidents (51 and 44%). The external costs of rail related to pollutant emissions and climate increase by 4% and 43%. Oppositely, the external costs related to accidents decrease by 27%. Road freight generates eight times the external costs of rail, 2.35 Euro cents per tonne kilometre in 2005 (5.6% accidents, 74.7% air pollution and 19.7% climate) vs. 0.28 (13.4% accidents, 53.9% air pollution and 32.7% climate).