六冲河特大桥荷载试验分析研究

以六冲河特大桥为工程背景,对斜拉桥成桥状态下的桥面线形和斜拉索索力进行了测试.同时使用MADIS软件建立空间有限元模型,通过对桥梁结构活载作用效应进行分析,确定了静载试验的最不利工况,以及各工况加载载位.经现场静动载试验,得出了各加载工况下相应的挠度、应变、索力和塔偏参数,并对桥梁承载能力进行了评定.     

Research on deformation failure mode of slope diseases caused by earthquakeEI北大核心

Research purposes: The slope diseases caused by earthquake are different from other types of slope diseases in general. They have various mechanism and deformation failure modes and can cause large damages. In order to prevent and control these diseases pointedly, based on investigations of 3 slope diseases along the Wenchuan-Yingxiu Road influenced by the "5·12"Wenchuan Earthquake, the analyses and researches were made and done on the slope diseases types, slope structures and mechanism to summarize the deformation failure modes of slope diseases caused by earthquake. Research conclusions: (1) The main types of slope diseases include the collapse, landslide, slumping, fault and rockfall. Collapse is the major disease, up to 71% of the total slope diseases. About 80% diseases happens to rock slope. (2) The deformation failure modes of collapse have 8 types like pull cracking and falling.Landslide has 5types like pull cracking, shearing off and sliding. Slumping has 2 types of shaking loose and slumping. Rock falling has 2 types of throwing and dropping. Disorder falling has 1 type of shaking to crimping. (3) This research result can provide the reference to prevention and control of the slope diseases caused by earthquakes along railways and roads.     

Evaluating the operational performance of airside and landside at Chinese airports with novel inputs

ABSTRACT

This paper evaluates the operational performance of airside and landside at Chinese airports with two novel inputs. Furthermore, the airport landside operation is decomposed into passenger-terminal operations and cargo-warehouse operations. One novel input is the capability of the runway system which is introduced into airside performance evaluation. The other novel input is cargo warehousing which is introduced into landside performance evaluation. To address multiple optimal solutions when estimating Returns to Scale in Data Envelopment Analysis, we adopted the Zhu and Shen method. This empirical study shows that neither the number of runways nor total runway length is a genuine index of runway system capability in the evaluation of airside performance. Only four airports achieved full efficiency in all eight measures while eight airports did not achieve any full efficiency. In addition, one airport did not perform well in the benchmark analysis.     

典型原料生物柴油燃烧颗粒物微观结构及氧化特性

应用EEPS粒径谱仪、高分辨率透射电子显微镜、同步热分析仪等仪器分析了3种不同碘值生物柴油(大豆生物柴油、棕榈生物柴油和餐废油脂生物柴油)在高压共轨柴油机燃烧产生颗粒物的微观结构和氧化特性.结果 表明:相较于柴油燃烧颗粒物,生物柴油燃烧颗粒物粒径偏小、聚集程度更高、基本碳粒子微晶碳层越发无序,起燃温度Ti、燃尽温度Te...     

厦门环东海域整治工程丙洲海域工程环保设计

厦门市环东海域综合整治工程丙洲海域工程的清淤、吹填造地设计,通过采用环保型绞吸式挖泥船,并在造地区外建造带拦泥帘的储泥砂池,利用池塘梗、围堰延长吹填区泄水流径、增加沿程沉淀等措施减轻了施工对水环境和生态环境的影响,满足了环境保护的要求,为类似工程的设计、施工提供借鉴。     

基于水陆联运的铁路集装箱空箱调运策略

分析铁路集装箱空箱调运产生的原因及其对铁路货物运输业务的影响,针对我国铁路运能紧张的现状。提出以水陆联运方式进行铁路集装箱空箱调运的策略。     

高速重载线钢轨打磨策略研究初探

基于国内外钢轨打磨现状 ,分析研究高速重载线钢轨打磨策略 ,从打磨限值标准、打磨车工作参数标准、打磨质量控制标准等方面论述高速重载线钢轨打磨策略的研究思路、研究方法和关键技术。重点就轮轨系统动力学与接触状态进行初步探讨     

一种简便的测定精子顶体酶的方法——固定明胶底物薄膜法

基于精子顶体酶的溶蛋白特性,我们建立了一种简便的检测精子顶体酶活性的方法。此法以固定明胶薄膜为底物来显示精子顶体酶的活性。本实验用此法测定了三种哺乳类动物精子的顶体酶,结果表明,该法简便、可靠,并且可连续观察单个顶体酶的活性反应,很适合于用作临床男性不孕症检查的常规方法。     

AN EFFICIENT RF COIL FOR GENERATING A CIRCULAR POLARIZED MAGNETIC FIELD

1IntroductionThecreationoftheprincipleofmagneticresonanceimage(MRI)iscreditedtoP.C.Lauterburwhoachivedthefirstimageinl973-It'hasbeendemonstratedthatMRIisabletopro-videthehumanbody'simagewithhighspatialresolutionandhighsensitivitytopathologicalchanges.TheRFcoilisusedtoproduceanddetectradiofrequency(RF)magneticfieldB,.IntheMRIsystemnuclearmagneticresonanceisexcit-edinabodytobeimagedbyapplyingtothebodyanRFmagneticfieldB,perpendiculartoarelativelystrongstaticmagneticfieldB,'IftheRFstreng…     

一种新型混合动力汽车驱动系统的设计

在丰田公司Prius混合动力汽车的驱动结构及其控制策略基础上，提出了一种新型多模式混合动力汽车驱动系统的实现方案。该方案采用了行星轮系和4组齿轮副的传动机构，实现了驱动机构在7种工作模式下的连续传动。