Numerical modeling of the 2008 Wenchuan earthquake-triggered Niumiangou landslide considering effects of pore-water pressure

Bulletin of Engineering Geology and the Environment - Ring-shear experiments are commonly conducted to analyze the kinematic mechanisms of landslides triggered by earthquakes, particularly for...     

Stability analysis of deep-buried hard rock underground laboratories based on stereophotogrammetry and discontinuity identification

Bulletin of Engineering Geology and the Environment - In a tunnel, instabilities in the surrounding rock mostly occur within the sidewalls and crown. After acquiring the rock mass structure, a...     

As-cast microstructure of Al-Zn-Mg-Cu-Zr alloy containing trace amount of Sc

It has been reported that the element scandium(Sc) is the most effective modificator which can significantly refine the grain size, prohibit recrystallization process and increase the strength. Adding trace of Sc in 7000 series aluminum alloys is considered to be an effective way to modify its micros tructure and promote mechanical properties. In order to study the effect of Sc element on ascast microstructure of Al-Zn-Mg-Cu-Zr alloy, ingots containing different amounts of Sc were prepared by ferrous-mold cast. Microstructures were characterized by means of differential scanning calorimeter(DSC), X-ray diffraction(XRD), optical microscope(OM) and scanning electrical microscope(SEM). The results indicate that when the Sc level exceeds a critical concentration,Al_3(Sc,Zr) primary phase would form in the melt and act as an efficient nucleant, resulting in very refined grain and an equiaxed grain structure. Sc element reduces the number of eutectic phases formed during solidification,coupled with an increase in the concentration of major alloying elements retained in the solute. This behavior suggests possible benefits in improving the integrated properties of terminal products.     

Rapid Carbonation for Calcite from a Solid-Liquid-Gas System with an Imidazolium-Based Ionic Liquid

Aqueous carbonation of Ca(OH)₂ is a complex process that produces calcite with scalenohedral calcite phases and characterized by inadequate carbonate species for effective carbonation due to the poor dissolution of CO₂ in water. Consequently, we report a solid-liquid-gas carbonation system with an ionic liquid (IL), 1-butyl-3-methylimidazolium bromide, in view of enhancing the reaction of CO₂ with Ca(OH)₂. The use of the IL increased the solubility of CO₂ in the aqueous environment and enhanced the transport of the reactive species (Ca²⁺ and CO₃²⁻) and products. The presence of the IL also avoided the formation of the CaCO₃ protective and passivation layer and ensured high carbonation yields, as well as the production of stoichiometric rhombohedral calcite phases in a short time.     

预应力锚索技术在公路高边坡施工中的应用分析

本文通过对预应力锚索技术在公路高边坡施工中技术要点的分析,对预应力锚索的应用做了详细地阐述,以供读者阅读和参考。     

燃气企业发展战略浅析——以AB燃气为例

本文以燃气市场发展背景为视角,以燃气企业作为研究对象,深入分析和研究了燃气企业面临的市场竞争及自身存在的问题,以某沿海燃气集团(AB燃气)为例分析燃气企业市场前景和国家对燃气企业的政策形势,并总结AB燃气在满足国家政策要求下,为适应市场坏境所提出企业发展五项战略举措及实施措施。     

核电厂蒸汽发生器多功能模拟体研制

在压水堆核电厂蒸汽发生器的在役检查和维修中,需要使用蒸汽发生器模拟体,预先对检修工器具进行调试、验证以及人员的培训。基于蒸汽发生器模拟体的功能需求和设计要求,研制了一种可满足多种需求的蒸汽发生器模拟体,模拟体总体结构设计为原型二分之一,选用复合材料,并设置有观察窗。模拟体具有结构紧凑、经济性高、可观测等特点。功能试验验证结果表明,本文所述蒸汽发生器模拟体可有效用于核电厂蒸汽发生器的检修培训。     

次临界反应性测量方法研究

压水堆启动前需要进行物理启动试验,其中调临界是相对耗时的一部分。采用次临界条件下的试验,可以省去调临界的步骤,提高物理启动试验的安全性和适用性,加速物理启动试验的进程,提高压水堆的负荷因子。目前,次临界反应性测量受限于测量信号较弱,背景噪声强,误差较大,难以满足商用压水堆的工程应用要求。本文基于源倍增方法,利用空间重要性修正因子和信号线性修正提高次临界反应性测量的精度,成功地在核电厂首循环上实现了次临界反应性测量的蒙特卡罗方法计算,取得了较好的计算精度与效果。     

Synthesis and dissociation of soliton molecules in parallel optical-soliton reactors

Mode-locked lasers have been widely used to explore interactions between optical solitons, including bound-soliton states that may be regarded as"photonic molec...