秦沈客运专线大号码道岔的铺设

根据秦沈客运专线大号码道岔结构特点和铺设精度要求,确定其施工工艺和施工具体过程,并指出铺设施工中应解决和注意的几个问题。     

基于灵敏度的结构损伤识别方法

提出了一种基于灵敏度的结构损伤识别方法,该方法仅利用结构损伤前后的前三阶模态参数来确定结构的损伤定位因子和损伤程度评估因子,实现对结构损伤的识别。本文用三维五层框架结构有限元模型数值模拟了四种典型的损伤工况,损伤识别结果表明,应用本文所提的损伤定位因子可准确的对损伤构件实现损伤定位,相应得出的损伤程度评估结果也与模拟的损伤工况较吻合。该方法不需要归一化的振型,仅利用结构基准模型和损伤实测的低阶模态即可,简便易行,具有一定的应用价值。     

采用联结板加固法整治双柱式轻型桥墩

1概况淮南线K132 704-65#桥,位于铜炀河至中焊区间,建于1989年,双线,下行P60正轨、P50护轨,上行P50正轨、P43护轨。桥全长91．4m,4孔16m预应力铪T形梁,设计荷载为中-22级,3组桥墩均为双柱式圆形墩。2002年发现异常晃动,为了保证行车安全,我们立即采     

山东省交通厅公路机械信息管理系统

运用公路机械管理信息系统是提高公路机械管理水平的一种有效手段.针对"公路机械管理信息系统"的主要功能和系统的创新点两方面进行了介绍.     

SCINTIGRAPHIC DETECTION FOR ECTOPIC GASTRIC MUCOSA WITH TECHNETIUM-99m PERTECHNETATE

Meckel'sdiverticu1umisac0mmoncauseofGIbleedinginchildren.Ectopicgastricmucosaisfoundin57%ofsymp-tomaticpatientswithMeckel'sdiverticu-lum.Usually,itisdifficultt0diagnosebe-causeroentgenographiccontraststudies,includingselectiveangiography,failtovi-sualizethediverticulum'Endoscopyisalsouselessf0rthediagnosis.Imaging0fMeckel'sdiverticulumwhichcontainsgastricmucosahasbeendonesuccesfullyandintr0ducedasar0u-tinetestinthelasttwodecades[1).Manystudieshavedem0nstratedtheclinicalsig-nificancetz～43.I…     

对船舶中央冷却系统进行流阻及传热分析暨有效的节能措施

作者对船舶中央冷却系统进行流阻及传热分析，得出主海水泵耗功应按冷却所需热负荷和海水温度的变化而自动增减，以取得有效的节能效果。     

New weighted fuzzy case retrieval method for customer-driven product design

Case retrieval (CR) is critically an important part of case-based design. However few studies attempt to research CR for customer-driven design and analyze the effect of other production factors besides similarity computation. This paper proposes a new CR method for customer-driven design, and requirement-weighting analysis. Fuzzy set theory are integrated into CR process to deal with the fuzzy and imprecision customer requirements. So the proposed method is called weighted fuzzy case retrieval (WFCR). Furthermore, similar case evaluation is added into CR process to demonstrate that the best case is selected not only on the basis of satisifaction for the given requriements, but also on the degree of preference over other cases according to multiple evaluation criteria. Meanwhile, WFCR system is developed and applied to power transformer design to validate its scientificity and practicality. Finally, the paper statistically validated the supriority of WFCR by comparing it with traditional fuzzy case retrieval methods (FCRs), and the comparison indicates that WFCR is more accurate than other FCRs.     

交通影响评价中交通量预测算法的实例检验

采用实例分析对交通影响评价中传统的交通量预测算法进行检验.利用某大型项目2004年的预测交通量与2009年调查交通量进行对比,验证了传统预测算法模型及参数的正确性,并对存在的偏差进行原因分析及提出建议,为交通影响评价中预测的准确性提供理论依据.     

Model and simulation of a new ultra-narrow trigger frequency alterable pulse generator

Two new kinds of ultra-narrow trigger frequency alterable picosecond pulse generator are presented. One can produce positive pulses and the other can produce negative pulses. The two pulse generators are subdivided into three parts: signal driving circuit, differentiator network and pulse shaping circuit. The pulse shaping circuit is made of step recovery diode (SRD) and short-circuit microstrip line. A positive pulse with width of 54 ps (50%–50%), rising time of 30 ps (10%–90%) and falling time of 32 ps (90%–10%), and a negative pulse with width of 54 ps (50%–50%), rising time of 30 ps (90%–10%) and falling time of 30 ps (10%–90%) are achieved in simulation. All of the components are ready-made and inexpensive. They can be applied in ultra-wideband (UWB) communication system, such as transmitters and receivers.     

直埠南枢纽互通方案研究

以直埠南枢纽为例,在前期工可阶段梳理了各种控制因素并提出多个方案,经筛选并结合交通流向、地形地物、运营保通、用地条件、造价等实际情况,在初步设计阶段对方案进行了深化完善,使新建枢纽与原枢纽构成双T形复合式枢纽,巧妙组织匝道交通,消除了行车交织区,提高了行车安全,对高速公路上增设枢纽的类似工程具有较强的实践性和指导性.