浅谈中承式钢管拱肋单拱桥的施工方法

右江平圩大桥钢管拱肋的制作、拼装、吊装、混凝土灌注的施工方法及注意事项 ,事故原因分析及处理。     

Relaxation time and conductivity of comb‐like gel polymer electrolytes

Using the copolymer of acrylonitrile (AN), methyl methacrylate (MMA), and poly(ethylene glycol) methyl ether methacrylate as a backbone and poly(ethylene glycol) methyl ether (PEGME) with 1100 molecular weight as side chains, comb‐like gel polymers and their Li salt complexes were synthesized. The dynamic mechanical properties and conductivities were investigated. Results showed that the gel copolymer electrolytes possess two glass transitions: α‐transition and β‐transition. Based on the time–temperature equivalence principle, a master curve was constructed by selecting T_α as reference temperature. By reference to T₀ = 50°C, the relation between log τ_c and c was found to be linear. The master curves are displaced progressively to higher frequencies as the content of plasticizer is increased. The relation between log τ_p and the content of plasticizer is also linear. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 576–584, 2007     

基于内置接头参数数组的整环衬砌模型结构分析

为在整环衬砌结构分析中正确体现管片接头参数的复杂特性,通过表格型数组将管片接头参数内置于整环衬结构分析的程序中。经迭代计算,实现了管片接头三维非线性参数在整环衬砌分析中的全面应用。研究表明：这种将接头参数和整环衬砌整合在同一程序的算法,不但结果可靠而且运算速度更快;管片接头的抗弯刚度、接缝张开量、混凝土最大压应变、螺栓拉应力都将随着拼装方式、接头位置、外部荷载而改变,不适合单一取值;该模型不仅能分析整环受力和变形,而且能评价各管片接头的安全状态。     

浅地表层界面折射波走时模拟

在工程与环境勘查中进行折射波法勘探时,其勘探对象通常为浅地表的层界面.由于当层界面起伏时无法得到折射波走时曲线的确切表达式,同时为了了解多个层界面的折射波走时曲线之间的相互影响,基于费马原理和斯奈尔定律实现了浅地表多层起伏界面折射波的走时模拟.利用水平层折射波时距曲线公式验证了编制程序的正确性,并模拟了野外常见地质模型的折射波走时.     

Integrated simulation framework for the process planning of ships and offshore structures

Recently, requests for accurate process planning using simulation have been increasing in many engineering fields, including the shipbuilding industry. To date, designers of shipyards have developed in-house simulation systems or used commercial systems such as the QUEST by Dassault system when requests for the simulation of process planning have occurred. However, these methods have some limitations. First, it requires a lot of time to develop a new in-house simulation system. In addition, it is hard to reuse previously developed systems when developing a new one and it is also hard for these to satisfy the various needs of shipyards effectively.     

SegHMC:一种基于Segmental HMM模型的顺式调控模块识别算法

顺式调控模块（Cis-regulatory module,CRM）在真核生物基因的转录调控中起着重要作用,识别顺式调控模块是当前计算生物学的一个重要课题.虽然当前有许多计算方法用于识别顺式调控模块,但识别准确率仍有待进一步提高.将顺式调控模块的多种特征信息结合在一起,有助于提高识别顺式调控模块的准确率.基于此,本文提出了一种识别顺式调控模块的算法SegHMC（Segmental HMM model for discovery of cis-regulatory module）.该算法建立了一种关于顺式调控模块识别问题的Segmental HMM模型,进一步扩展了顺式调控模块调控结构（或调控语法）的表示,不仅将顺式调控模块表示为模体（Motif）的组合,还进一步将模体共同出现的频率、模体顺序偏好以及顺式调控模块中相邻模体间的距离分布等特征引入到顺式调控模块的调控语法中.在模拟数据集和真实生物数据集上的实验结果表明,本文方法识别顺式调控模块的准确率显著优于当前的主要方法.     

基于分段搜索的多RFID标签抗冲突方法*

由于二元树抗冲突方法消耗的识别时间随标签数量呈线性增长,因而提高巨量（>100）标签的抗冲突识别的效率对于推动RFID的应用显得尤为重要。对此本文提出一种分段搜索清点RFID标签的抗冲突方法,通过减少清点过程中标签对阅读器回传数据的位数,达到减少传输耗时的目的。将其与现有的动态二进制搜索法对比,仿真结果表明,当标签突破一定数量,对于特定的分段方式,该算法能够显著降低清点过程的时间消耗。     

基于ARM的人体脂肪测量仪的设计

为解决传统的人体脂肪测量仪只测量人体的全身阻抗,不能反映人体各个部位的脂肪分布情况的问题,提出了人体阻抗分布模型和分段阻抗计算公式,进而测量人体不同部位的脂肪含量的方法,并设计完成了一种基于ARM处理器的人体脂肪测量仪;该仪器以ARM处理器S3C2410为核心,外扩激励信号源、信号采集和处理、放大电路及整流滤波等电路,在嵌入式linux操作系统下实现了对人体脂肪的测量和分析;实验结果表明,该仪器比传统的人体脂肪测量仪检测精度高,能反映人体脂肪分布状况。     

输电线路大跨越工程高塔组立施工技术探讨

介绍了输电线路大跨越工程高塔组立施工技术方案,吊装设备功能需求和安全保障措施;论述了高塔组立施工设备设计方案及原则、荷载计算及组合、有限元分析方法,提出了结构尺寸及重量估算的经验公式、设备基本参数;简要介绍了电视监控、超载保护、吊件位置检测系统、摇臂自动调位装置。     

关于500kV紧凑型线路架线施工中的技术问题

阐述了500 kV罗平至百色紧凑型线路工程施工和监理过程中,电气距离控制、滑车安装、导线缠绕打绞、弧垂施工、相间间隔棒安装、金具更换等技术问题及采取的有效控制措施和处理方法.