上海泻湖沼泽平原地区工程勘察的几点认识

本文结合工程实践,简要介绍了泻湖沼泽平原地区浅部土层的物理力学特性及该地区利用静力触探试验资料确定单桩竖向承载力的估算方法,并对在该地区进行岩土工程勘察过程中可能遇到的有关工程地质问题作出合理建议。     

不同土质条件下高能级强夯加固效果测试与对比分析

为了探讨山谷型与滨海型两种不同土质条件下碎石回填地基的强夯加固效果,开展了8000kN·m能级的现场强夯对比试验;同时考虑滨海大型工程建设地基处理施工的需要,在沿海地区实施了10000,15000kN·m高能级强夯的现场试验。通过对各场地不同能级试夯前后地基动力触探与静力载荷试验结果的分析与对比研究,得出如下结论:①采用8000kN·m夯击能处理山谷型厚层碎石回填地基,其有效加固深度可达10.0～11.5m;处理滨海型下卧软弱夹层且存在地下水的碎石回填地基,其有效加固深度为8.5～9.0m;②采用10000kN·m夯击能处理滨海山前厚层碎石回填地基,其有效加固深度为12～12.5m;③采用15000kN·m夯击能处理滨海型下卧软弱夹层且存在地下水的碎石回填地基,其有效加固深度为11.5m;④若采用梅纳公式的修正形式预估强夯的有效加固深度,其修正系数取值范围建议为0.29～0.40;对于软弱下卧层浅、高地下水等不利情况应取低值,对于回填碎石层厚、且级配较好时可取高值。     

高层住宅素混凝土桩复合地基设计

基底下局部土层不满足承载力要求,可采用素混凝土灌注桩作为增强体,形成素混凝土桩和土层共同受力的复合地基,从而提高土层承载力。通过分析比较,施工工期和造价具有较大的优势。     

沿海地区大空间公共建筑外部造型设计与传统文化表达

通过对我国改革开放以来沿海地区可借鉴的大空间公共建筑实例进行分析,归纳其外部造型设计中表达传统文化的手法,以期对丰富现代大空间公共建筑设计实践有所帮助。同时,通过对国外表达传统文化(或地域特色)大空间公共建筑实例的分析,提出其他可能的表达途径,作为对现有设计手法的增添和补充。     

平原地区城市常见地质灾害及其危险性评估

介绍了平原地区典型的地质灾害,包括地震灾害、地面沉降、岩溶塌陷、地裂缝等,结合具体实例分析了当前平原地区城市常见地质灾害及其产生的原因,探讨了其风险性评估的方法,为增强城市综合防灾减灾的能力提供了资料。     

变形速率对普碳钢中形变诱导铁素体相变的影响

针对普通碳素钢(Q235类型),研究在Ae3～Ar3温度区间内采用形变诱导铁素体机制获得超细晶铁素体的数量与变形速率的相互关系。实验在Gleeble 1500热模拟实验机上进行。实验方案为：1000℃保温2min,以10℃／s的速度冷却到变形温度[Ae3(840℃)至Ar3(780℃)],变形量为30％～50％,变形后立即水淬。结果表明,在840℃变形时,随着变形速率的增大,形变诱导铁素体量增多;在780℃变形时,随着变形速率的增大,形变诱导铁素体量减少;而在840-780℃之间变形时,变形速率存在最佳值,在该值下诱导生成的铁素体量最大。     

关节轴承密封槽及密封圈的设计改进

通过对关节轴承密封圈结构、材质性能及密封槽结构的分析,提出了一种新型的密封槽和密封圈结构,经实验和实际使用验证,改进后的密封装置密封性能良好,不易产生压装不到位、脱落及变形等缺陷。     

三江平原垦区农业现代化综合评价研究

三江平原垦区农业现代化的实现程度在全国已居于领先地位,为了动态地掌握农业现代化进程,文中设置了一套农业现代化进程评价的指标体系,并构造评价模型,对三江平原农业现代化进行综合评价,并针对现存问题提出相应的对策和建议。     

Detection,Identification, and Prevalence of Pathogenic Vibrio parahaemolyticus in Fish and Coastal Environment in Jordan

Vibrio parahaemolyticus is widely distributed in the marine environments and considered the leading cause of human gastroenteritis in Asian countries. A total of 150 marketed fish and 50 water and sediment samples from the Gulf of Aqaba were examined for the prevalence of pathogenic strains of V. parahaemolyticus. A total of 132 typical isolates obtained from the primary selective medium (thiosulfate‐citrate bile salt sucrose agar) and showed positive biochemical properties were subjected to confirmation by polymerase chain reaction targeting the gyrB and toxR genes. These genes were confirmed at rates of 82% (108 isolates) and 72% (95 isolates), respectively. The toxR positive isolates were tested for the presence of thermolabile hemolysin (tlh), thermostable direct hemolysin (tdh), and tdh‐related hemolysin (trh) virulence genes. Accordingly, the prevalence rates of pathogenic V. parahaemolyticus were 4%, 8%, and 12% in sediment, water, and fish samples, respectively. The 16S rRNA amplification and sequences were conducted for confirmation of the isolates and showing the relatedness among these isolates. The results showed that both 16S rRNA and toxR assays had same sensitivity and tested isolates had high nucleotide similarity irrespective of their sources.     

Theoretical and experimental analysis of bending rigidity of plain and twill woven fabrics

The study of bending behavior of woven fabrics is an important issue in textile scientific researches and its industrial applications. Different behavior of fabrics such as drape, comfort, and handling can be understood by this study. Bending rigidity of fabric depends on several factors such as weave geometry, bending rigidity of yarn, and yarn density. In this study, estimation of bending rigidity of woven fabric with different twill and plain structures, have been carried out using energy method. Generally, the woven fabric structure is divided into three different section lengths i.e. rigid, semi-rigid, and flexible sections. Thereafter, bi-component and tri-component models for predicting bending behavior of plain and twill woven fabric have been presented. Then, bending properties of fabric based on Shirley apparatus as well as weight per area as a physical property were measured. Good agreement between measured and predicted values, validated our theoretical models for obtaining bending rigidity, except considerable differences observed between experimental and predicted values using bi-component model of plain fabric. Therefore, using assumptions in calculation of the ratio of rigid section length to flexible section length (R₁), the modified model of plain fabric has been proposed.