长寿命沥青路面与传统沥青路面的比较分析

在介绍长寿命沥青路面与传统沥青路面特点的基础上,从寿命周期成本、设计理念、路用性能及结构层四个方面对长寿命沥青路面与传统沥青路面进行比较分析,可为长寿命沥青路面的推广与应用提供一定的参考与借鉴.     

柔性基层沥青路面结构内部的应力应变

利用三维有限元软件研究沪宁高速公路扩建工程中柔性基层在实测荷载作用下结构层内的应力应变,并与传统的圆形均布荷载作用下的路面结构作比较.研究表明,采用柔性基层并不会使土基受力过大,土基的变形在允许范围之内;级配碎石层顶和层底的受力大小相差不大,变形也很缓和.     

山区公路岩质边坡柔性防护与生态防护问题探究

从山区公路边坡崩塌的类型与特征入手,以“油小线”工程为例,介绍了山区公路岩质边坡柔性防护与生态防护方案的选择依据,以及方案的具体实施。实际运用表明,边坡柔性防护与生态防护适应山区公路岩质边坡防护的需要,在防护工程中具有良好的效果。     

基于实物期权与净现值法的飞机租赁决策研究

目前,飞机租赁是我国机队引进飞机的主要方式.航空公司结合自身情况对飞机租赁方式进行选择,对航空公司未来发展起到了至关重要的作用.在传统净现值法的基础上,引入多级实物期权法,分别对飞机经营性租赁与飞机融资性租赁进行分析,从而做出最优决策.该方法考虑了项目的不确定性,分析管理层在中途修正战略的价值,弥补了传统净现值法不考虑管理决策层采取柔性投资策略价值的缺陷.     

Mechanical response of steel wire wound reinforced rubber flexible pipe under internal pressure

Steel wire wound reinforced flexible pipe in this study mainly consists of multiple anisotropic steel wire wound reinforcement layers and multiple isotropic rubber layers. Based on 3D anisotropic elastic theory, the analytic solutions of stresses and elastic deformations of steel wire wound reinforced rubber flexible pipe under internal pressure are presented. As the adjacent reinforcement layers with wound angle have different radii, the single reinforcement layer shows the effect of tensile-shear coupling. Moreover, the static loading test results of steel wire wound reinforced rubber flexible pipe under internal pressure are basically coincided with the calculated values by present method.     

谈高职院校应更新对大学生创业教育的理念

本文作者以自身对创业教育的新认识,阐明了大学生创业教育的重要性,通过对当前我国高校创业教育的情况分析,指出了高职院校开展大学生创业教育存在的不足,明确了高职院校开展创业教育的任务目标,以及高职院校培养大学生创业教育的有利条件。     

某小高层建筑刚柔复合桩基设计分析

阐述刚柔复合桩基的基本形式。结合工程实践,根据研究设计说明刚柔复合桩基的设计过程,以及主要设计参数确定的基本方法。论述设计参数对刚柔复合桩基性状的影响,为设计工程师提供参考。     

中美教育理念的对比分析

面对一个全球化的新经济时代,随着社会、经济、政治、文化、科学技术的快速发展,人们越来越深刻地感受到教育的潜在作用力。世界许多国家纷纷研究其他国家的教育优势来弥补本国教育的不足。教育改革成为一种时代的趋势。中美两国的教育有着极为不同的传统,中国的教育注重对知识的积累和灌输,注重培养学生对知识和权威的尊重,注重对知识的掌握和继承,以及知识体系的构建。相比较,美国则更注重培养学生运用知识的实际能力,注重培养学生对知识和权威的质疑、批判精神,注重对知识的拓展和创造。这两种教育表达了对待知识的不同态度。中国的教育表达的是对知识的静态接受,美国的教育则表达的是对知识的动态改变,这一＂静＂一＂动＂之间,反映了两国教育不同的知识观。     

榕江特大桥钢桁梁柔性拱架设方案比选

针对新建厦深铁路榕江特大桥主桥连续钢桁梁柔性拱的结构特点,结合设备、工期和气候环境等影响因素,对连续钢桁梁的三种施工方案：利用临时塔架及拉索对称悬拼方案、采用临时支墩配合对称悬拼方案和采用临时支墩不对称悬拼方案进行了比选,最终确定采用临时支墩配合对称悬拼的连续钢桁梁柔性拱施工方案,具有施工设备投入少、风险低、工期短等优势,为编制施工组织设计提供了技术支持。     

Development of an intelligent CAE system for auto-body concept design

The concept design phase is a critical step in auto-body design, as it has a great effect on later design work. This paper describes the implementation of an auto-body structure design in the early stages of a new auto-body developing program. In order to reduce the long design period and analysis error that plagues traditional auto-body concept design, an intelligent CAE system has been successfully developed and implemented based on the UGS NX/API opening platform. This system, the so-called ACD-ICAE (Auto-body concept design-intelligent computer aided engineering) System that means concept design-intelligent computer aided engineering system, employs a fully parametrized template method to build the conceptual auto-body geometry model and FEM model quickly and easily. It also integrates auto-body modeling, analysis and optimization on only one CAD platform via a parametric variables database. Moreover, all parametric variables are shared and updated in different phases of the ACD-ICAE System. A wizard User Interface (UI) based on knowledge of auto-body engineering was developed and used in this system. The procedures implementing the functional diagram of the ACD-ICAE system are also provided. A typical example of a car body concept design with four doors shows that the ACD-ICAE system is efficient and accurate.