摘要：新疆某工程场地地质条件复杂,土层软弱,均匀性差,地基承载力低。采用夯实碎石挤密墩方法,先人工成孔,用卵石置换软弱土层,分层动力夯实,形成碎石挤密墩复合地基。通过控制置换率、墩长、墩径及垫层厚度,使处理后的复合地基承载力特征值大幅提高,由天然地基的120 kPa提高到200 kPa以上。最终变形量也大幅减小。

摘要：从"橡皮土"的工程特性出发,在全面分析其产生机理的基础上,通过相应的室内击实试验,着重研究黏土在压实过程中的最佳含水量和最大干密度,并简要探讨了防治措施。最后,以某工程的地基处理过程为例提出了处理方案,并取得了理想的效果,可供工程技术人员设计、施工时参考。

摘要：结合生产实际阐述了渤海石油装备制造公司螺旋埋弧焊管生产线在钢管X光检查过程中出现焊缝跟踪不准确问题。分析发现,钢管进管方式、X光检测车结构的问题,造成钢管在进行X光检验时焊缝跟踪不好,更严重的是在生产小规格钢管时由于钢管发生偏移容易撞到高频高压发生器,使X光检测车故障率很高。通过改变钢管的进管方式,重新设计X光检测车结构,成功地解决了X光焊缝跟踪问题。

摘要：Electrochemical impedance spectroscopy(EIS) and electrochemical noise(EN) techniques were used to detect stress corrosion cracking(SCC) on 40Cr steel specimens exposed to the acidified chloride solution at ambient. To test these two techniques,slow strain rate tensile(SSRT) tests were performed with 40Cr specimen in the identical corrosive solution at room temperature. In impedance measurements,phase shifts in frequency range from 1 to 1 000 Hz show a clear difference between the stressed and non-stressed specimens,suggesting that stress corrosion cracks are detected by the impedance measurements. EN signals in the process of SCC were recorded and then analyzed by standard deviation(STD). On the other hand,the mechanical properties,such as maximum tensile strength(MTS) and fracture strain(FS) measured by the SSRT,decrease significantly when the specimens are exposed to the corrosive solution relative to that in an inert medium. The SSRT results are consistent with fractography of the tested specimens by scanning electron microscopy(SEM). Analysis of the fracture surface clearly shows intergranular attack,suggesting that stress corrosion cracks are formed.

摘要：目的:调查和比较氯胺酮依赖者和苯丙胺类兴奋剂依赖者的社会人口学特征和毒品滥用情况。方法:使用病例报告表采集氯胺酮依赖者和苯丙胺类兴奋剂依赖者的社会人口学特征和毒品滥用情况。结果:对319名氯胺酮依赖者和294名苯丙胺类兴奋剂依赖者比较分析显示,氯胺酮依赖者的年龄更年轻,吸食持续时间更长、使用剂量和频率更高。氯胺酮依赖者受教育的程度也更高,更多人有工作。结论:氯胺酮依赖者有更严重的毒品依赖问题,但引起社交/功能障碍的证据却不足。这种差异提示需要关注不同毒品和吸食剂量对社会功能的影响。