Characterization of driving patterns and development of a driving cycle in a military area

This study develops a gradient-sensitive driving cycle for vehicles in military areas with paved and unpaved roads over steep and undulating terrain. The methodology develops the driving cycle using micro-trips extracted from real-world data taking into account factors that affect fuel consumption. The accuracy of cycle depended on the root mean square error and information value.     

欧盟铁路投融资制度对长三角轨道交通网投融资设计的启示

如何谋求在政府与经营主体之间、中央政府与地方政府之间，适当分配路网建设及运营利益与风险，建立起与之相适应的投融资制度，以提高路网建设与运营效率，是长三角轨道交通网络建设的重要课题。分析了长三角轨道交通网络投融资面临的主要问题，介绍了英、法、德、瑞典等欧盟国家主要铁路投融资制度，希望为建立长三角轨道交通网投融资制度提供一些借鉴。     

Organizational change for port authorities: a social information processing analysis

Port authorities, like other organizations, have been constantly required to evolve in response to business, environmental, and technical changes since the 1980s to continue improving their competitiveness and performance. However, people often resist change due to various reasons, and the uncertainty of change has been pointed out as one of the most important reasons why this happens. This study contributes to social information processing (SIP) research and constructs an SIP model to explore employee’s response to port organizational reform in Taiwan. Empirical results are consistent with general job schema, where employees with job security orientation are less supportive of port corporatization, and those with corporate development orientation are more supportive of port organizational reform. Organizational trust and job conception are related to port workers’ attitude to port corporatization. Nevertheless, organizational communication does not positively moderate the relationship between job schema and employee attitude to port organizational change.     

跨越结构层的反射裂缝扩展过程参数影响分析

基于ABAQUS有限元软件和断裂力学分析理论,采用离散裂缝长度模拟反射裂缝扩展过程,针对裂缝由基层底扩展并跨越至面层顶时,不同结构层参数对裂缝尖端应力强度因子影响进行了分析,并通过工程实例进行了结构层参数优化设计计算。结果表明：在荷载作用下,基层底部往上存在一定范围的受拉区,受拉区裂缝将受到张拉和剪切的混合型作用,面层和基层参数的增大都会引起张拉型应力强度因子的增大,对早期裂缝控制不利;裂缝扩展后期,适当增大基层模量、厚度以及面层厚度可减小剪切型应力强度因子,其中适当增加面层厚度较明显;在防治反射裂缝扩展方面,在保证路面其他控制条件下,应选择较低的面层模量;工程实例的优化设计计算验证了前述结论。     

An improved proportionate normalized least mean square algorithm for sparse impulse response identification

In this paper after analyzing the adaptation process of the proportionate normalized least mean square （PNLMS） algorithm, a statistical model is obtained to describe the convergence process of each adaptive filter coefficient. Inspired by this result, a modified PNLMS algorithm based on precise magnitude estimate is proposed. The simulation results indicate that in contrast to the traditional PNLMS algorithm, the proposed algorithm achieves faster convergence speed in the initial convergence state and lower misalignment in the stead stage with much less computational complexity.     

高路堤软基深部变形机理及位移响应规律

路基填筑不断增加的上部荷载超过软土上覆＂硬壳层＂极限应力,致使硬壳层应力扩散作用失效,软土地基强烈受压发生不排水固结,压缩量大,为路基提供了较大变形空间,导致高路堤发生推移式滑动鼓胀变形。必须停止路基填筑,立即实施抗滑桩对软土路基进行支挡防护。桩的位移结果表明：桩身已开始受力,变形小幅增加后趋稳定,累计位移量可控。     

现代多电平逆变器的控制策略

今天多电平逆变器已引起人们极大的兴趣,但是随着电平数的增加,控制的复杂性也随之增加,并且带来了电压不平衡等问题.文章对当今水平的多电平逆变器的调制技术和控制策略,如:多电平正弦脉冲宽度调制、空间矢量调制、多电平选择性谐波消除、空间矢量控制以及电容器平衡技术等,进行了系统的分析.     

现代多电平变流器的工业应用和技术展望

系统地综述了多电平变流器在大功率中压交流调速和电力系统用高压电力电子装置中的应用,以及在低压高质量供电系统中的应用及发展前景.     

从《行政许可法》谈船员规范管理工作

海事管理机构是对水上安全实施统一监督管理的主管机关,代表国家进行海事执法,其中也涉及到实施大量的海事行政许可项目,以《行政许可法》来规范海事行政许可的设立和实施是非常必要的。下面就从《行政许可法》的角度来谈谈如何实施好海事行政许可,规范船员管理工作,提出自己的一些粗浅看法。     

连续箱梁桥检测及加固评价

以某连续箱梁桥加固为工程背景,通过对加固前、后两次荷载试验获得的现状数据进行对比分析,对加固效果进行了评价.同时引入"应力储备系数"概念,为以后的预应力连续箱梁桥的加固荷载试验提供借鉴.