碎石桩复合地基稳定性塑性极限分析法

基于塑性力学极限分析上限定理，建立了复合地基平移、转动相结合的破坏机构．根据外部作用荷载和土体自重所做的外功率等于地基变形所消耗的内部能量耗损率，求得了碎石桩复合地基稳定安全系数计算公式．工程算例分析表明，该方法对于碎石桩复合地基的稳定性分析具有一定实际意义．     

二苯基硫脲的合成与分析

探讨了一种合成二苯基硫脲(DPTU)的新方法，以酸性树脂作为催化剂、苯胺和二硫化碳作为反应物在温和条件下选择性地合成了DPTU，考察了催化剂用量和反应时间对产物收率的影响．结果表明：酸性树脂对本反应有显著促进作用；反应4h内DPTU收率随反应时间迅速增加，4h后则增加缓慢；用4g催化剂、9．1ml。苯胺和12mL CS2(摩尔比为1：2)在回流温度下反应6h，DPTU的收率达82．7％，选择性为100％，用GC／MS，HPLC／MS，FTIR，UV和^1H NMR分析了合成的DPTU。     

振动挤密碎石桩与CFG桩联合应用处理地基的工程实践

本文以太原某变电站工程为例，介绍用碎石桩与CFG桩联合应用处理地基，达到既消除液化，又提高承载力要求双重目的工程实践。     

金刚石圆锯片切割石材过程研究

将金刚石圆锯片切割石材过程中的加工对象、加工刀具、加工工艺作为一个有机研究对象，提出金刚石对石材的切割作用主要为挤压、滑擦和压碎；金刚石颗粒的损耗过程可分为正常损耗和异常损耗；探讨了加工工艺对金刚石颗粒损耗的影响。     

氯化物排放与燃烧脱氯技术工业性试验研究

对某电厂煤粉炉除尘器前后HC1排放量进行了实测，并在垃圾流化床锅炉和链条炉上进行了燃烧脱氯试验。研究结果表明：(1)含氯废弃物是垃圾焚烧炉HC1排放最主要来源；(2)在流化床中，煤中氯化物排放浓度和排放率较低，单一钙基吸收剂的固氯效果比在链条炉中明显，脱氯剂种类与脱氯剂添加量对脱氯效果有一定影响；(3)链条炉燃烧温度高、燃料停留时间长，燃烧脱氯应采用耐高温脱氯剂，以解决脱氯产物CaCl2的再分解问题；(4)对于链条炉，采用脱氯剂半预混半喷射两段燃烧脱氯方式可使脱氯产物在炉内停留时间大大缩短，有效降低脱氯产物的分解率，因此可获得较好的脱氯效果。     

基于桩-土作用效应的滚石撞击桥墩动力响应分析

滚石灾害会直接影响山区桥梁结构使用状况,甚至会导致桥墩偏位、落梁甚至造成整个桥梁发生坍塌。为了能更加真实的模拟滚石撞击桥墩这一动力过程,结合工程实例建立有限元模型,对碰撞动力学分析理论以及数值分析原理进行了介绍。运用LS-DYNA对不同滚石质量、不同滚石速度撞击桥墩时结构动力响应进行参数化分析,研究表明:滚石质量越大、速度越大对桥墩损伤产生的影响越显著。     

黑山铁矿露天采场边坡稳定性研究与治理实践

黑山露天采场西边坡由于断层节理发育，造成大面积滑坡，给采场安全生产造成极大威胁。采取现场编录和工程钻等手段，详细摸清了西边坡岩体断层节理情况。通过对边坡进行稳定性分析研究，制定出具体治理方案。采用地表截洪沟阻水、770 m水平预留宽台阶并在宽台阶外缘砌筑干砌石挡墙、对宽台阶实施喷锚支护加固等措施，消除了770 m水平以上边坡对下部各台阶生产作业的威胁，保证了露天采场深部的安全生产。     

Non‐destructive detection of corrosion applied to steel and galvanized steel coated with organic paints by the pulsed phase thermography

Organic coatings in the automobile industry have to resist corrosion and mechanical damage from stone chipping. Currently, no tool is established in industrial non‐destructive applications for analyzing the damage of stone‐impacts and the following corrosion after accelerated corrosion tests. Measurement methods such as the scanning Kelvin probe can analyze the corrosion progress in a detailed manner, but with a long measurement time. The pulsed phase thermography (PPT) is a non‐destructive tool to analyze inhomogeneities and defects in materials, with a huge field of applications existing. The present work shows advances in using the PPT to detect propagation of corrosion under coatings. Physical principles of the mechanism of the corrosion detection under coatings are described. Results of measurements of organic coatings on carbon steel as well as of organic coated galvanized steel show the corrosion propagation. Influencing factors to the measurement such as the thickness of the coatings are investigated, but no significant effect on the quality of the analysis was found. The corrosion progress can be monitored by the PPT fast and reliably. The achieved results correlate with the theoretical basis and the test results after surface characterization and destructive analysis of samples.     

Failure of reinforced concrete and tuff stone masonry buildings as consequence of hydrogen pipeline explosions

Pipelines are the most efficient method of transporting large quantities of hydrogen, and the low volumetric energy density of gaseous hydrogen requires that the gas must be compressed to extremely high pressure to be used as a transport fuel. The failure of high pressure hydrogen gas pipelines and subsequent explosion may induce heavy damage to buildings. In this paper, such an issue is addressed for existing reinforced concrete framed buildings and tuff stone masonry buildings. Physical features such as the gas jet release process, flammable cloud size, blast generation and propagation, and explosion effects on structural components of buildings are considered and evaluated through the SLAB integral model, Multi-Energy Method and pressure‒impulse diagrams. Damage to both types of structural components was evaluated and the maximum distance of blast damage was derived in several environmental conditions, contributing to land-use planning and performance-based design/assessment of pipelines and buildings.     

Influence of surfactant addition for the texture etching process on multi-crystalline silicon wafer

This study investigates the effects of different recipes and concentrations of surfactant on the texture and reflectance of a multi-crystalline silicon wafer surface. The morphology of the surface was examined and photographed using a field emission scanning electronic microscope. The reflectance of the surface was measured and analyzed using a self-designed optical system. The results of this study show that a higher hydrocarbon-surfactant (CH-surfactant) concentration in the etchant resulted in a slower reaction time. The optimum concentration of CH-surfactant was 1%. However, there were many white bubbles in the etching process. The optimum recipe for surfactant included fluoride 2% to diminish these bubbles. The reflectance was less than 22% in visible light. This cost effective acid chemical etching method is suitable for texturing silicon surfaces on 50?nm nanostructures. This is a critical criterion for determining the optimum recipe for surface texturing of acidic etching in solar cells.