First-Order Reliability Method for Probabilistic Liquefaction Triggering Analysis Using CPT

The potential for liquefaction triggering of a soil under a given seismic loading is measured herein by probability of liquefaction. The first order reliability method (FORM) is used to calculate reliability index, from which the probability of liquefaction is obtained. This approach requires the knowledge of parameter and model uncertainties; the latter is the focus of this paper. An empirical model for determining liquefaction resistance based on cone penetration test (CPT) is established through “neural network learning” of case histories. This resistance model along with a reference seismic loading model forms a performance function or limit state for liquefaction triggering analysis. Within the framework of the FORM, the uncertainty of this limit state model is characterized through an extensive series of sensitivity studies using Bayesian mapping functions that have been calibrated with a set of quality case histories. In addition, a deterministic model for assessing liquefaction potential in terms of factor of safety is presented, and the probability-safety factor mapping functions for estimating the probability of liquefaction for a given factor of safety in the absence of the knowledge of parameter uncertainty are also established. Examples are presented to illustrate the proposed methods.     

西大林桥检测评定及合理加固方案的研究

以辽宁省新民市西大林桥为依托，对其进行了横向，纵向挠度以及静态应变实验，所得数据利用旧桥检算系数法对其进行承载能力评定，其结果为该桥的加固提供依据，同时按照大边梁理论提出了加固改建要点，并对加固后的方案合理性进行了承载能力鉴定，其结果满足要求，进一步表明了加固改建效果合理可靠，旨在为类似旧桥承载能力评定与加固提供参考。     

Automated identification of amino acid sequence variations in proteins by HPLC/microspray tandem mass spectrometry

Amino acid sequence variations resulting from single-nucleotide polymorphisms (SNPs) were identified using a novel mass spectrometric method. This method obtains 99+% protein sequence coverage for human hemoglobin in a single LC-microspray tandem mass spectrometry (microLC-MS/MS) experiment. Tandem mass spectrometry data was analyzed using a modified version of the computer program SEQUEST to identify the sequence variations. Conditions of sample preparation, chromatographic separation, and data collection were optimized to correctly identify amino acid changes in six variants of human hemoglobin (Hb C, Hb E, Hb D-Los Angeles, Hb G-Philadelphia, Hb Hope, and Hb S). Hemoglobin proteins were isolated and purified, dehemed, (S)-carboxyami-domethylated, and then subjected to a combination proteolytic digestion to obtain a complex peptide mixture with multiple overlaps in sequence. Reversed-phase chromatographic separation of peptides was achieved on-line with MS utilizing a robust fritless microelectrospray interface. Tandem mass spectrometry was performed on an ion trap mass spectrometer using automated data-dependent MS/MS procedures. Tandem mass spectra were collected from the five most abundant ions in each scan using dynamic and isotopic exclusion to minimize redundancy. The spectra were analyzed by a version of the SEQUEST algorithm modified to identify amino acid substations resulting from SNPs.     

计算机绘制网络图所有路径计算方法的研究

本文研究了影响网络图线路数量的因素,提出了节点和有向线是组成线路的基本要素,以及用计算机绘制和计算网络的所有路径的计算方法.此方法可解决任意节点和有向线的网络中所有线路值和关键路径的时间计算.     

浅谈工程设计的质量管理与控制

论述了工程设计质量在基本建设中的重要作用,强调了质量问题是反映一个国家的文化水平、管理水平、生产力发展水平和民族素质的综合性标志,结合中国国情分析了工程建设质量水平上不去的原因。提出以科学管理为主导,运用先进的科学技术对工程设计质量实行控制,以推动设计质量不断进步。     

自然状态下低层建筑室内热特性研究

利用周期性热作用下房屋的热稳定性理论对低层建筑(一层或二层)在室外气象参数自然作用状态下冬季的热物理性能进行了分析,为此类房屋节能改造提供了理论依据。     

改善供热蒸汽锅炉给水品质前后锅炉排污率的设计计算

介绍了目前国内工业蒸汽锅炉房工艺设计中最常用的水处理系统中锅炉排污率的确定方法,提出了计算机程序框图,并进行了实例计算,为确定水处理方案建立基本数据和给水系统的设计提供可靠的基础。     

含铅易切削合金结构钢研制

阐述注流加铅法生产易切削合金结构钢的生产工艺和铅在钢中的形态及其分布特征。测定35CrMoPb钢的机械性能和切削性能,并与美国41∠40钢进行了对比。结果表明该含铅钢的化学成分均匀,机械性能与美国41∠40钢相当,符合35CrMo钢的标准要求,而切削性能大大优于35CrMo钢,主切削抗力降低12.5%—20%,刀具寿命提高一倍,工件光洁度约提高一个等级,断屑性能好,不出现不规则连续型屑,达到美国41∠40钢水平。     

活性污泥法推流式曝气池池容影响因素的探讨

本文根据推流式曝气池池容公式,分析了微生物动力学因素和运行因素对推流式曝气池池容的影响,并比较了它们对池容影响程度的大小。     

制作复合材料的三维编织技术

本文研究制作复合材料的三维编织技术。