The Zn-Rich Corner of the Zn-Al-V-Sb Quaternary System at 450 and 600 °C

Phase relations in the Zn-Al-V-Sb quaternary system with Zn fixed at 93 at.% have been determined experimentally in the entire composition range for two temperatures, 450 and 600 °C, using scanning electron microscopy coupled with energy dispersive x-ray spectroscopy and x-ray diffraction. From the experimental results obtained, four four-phase regions and two four-phase regions have been confirmed in the isothermal sections at 450 and 600 °C, respectively. The (L + VZnSb) field is coexistent with all other phase fields in the section at 450 °C. The solubility of Al in VZnSb phase is up to 2.1 at.%. It dissolves up to 1.5 and 2.2 at.% in the V₃Sb phase at 450 and 600 °C, respectively. The V solubility in the AlSb phase is very limited. Moreover, no new ternary and quaternary compounds are detected in the present study.     

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...     

Quench Sensitivity of AA7N01 Alloy Used for High-Speed Train Body Structure

JOM - The quench sensitivity of AA7N01 aluminum alloy used for high-speed train body structure was investigated by end-quenching test, time–temperature-transformation curves simulation,...     

Chemical synthesis of SmCo_5/Co magnetic nanocomposites

A three-step chemical synthesis of SmCo_5/Co nanocomposites was developed. Firstly, the Co-Sm(OH)_3-Ca(OH)_2 precursors were prepared by co-precipitation.Secondly, SmCo_5 particles were obtained by reductive annealing of the precursors. At last, the SmCo_5/Co nanocomposites were achieved by chemical deposition based on SmCo_5 particles. The SmCo_5/Co nanocomposites contain hard magnetic phase of SmCo_5 with about 100 nm in size and soft magnetic phase of Co with about 8 nm in size,exhibiting independent two-phase structure without alloying. Compared to that of single-phase SmCo_5 particles, the saturation magnetization of SmCo_5/Co nanocomposites is increased by 27.5%. The synthesis provides a new route to fabricate SmCo-based nanocomposites.     

Fabrication of shish-kebab-structured carbon nanotube/poly(ε-caprolactone) composite nanofibers for potential tissue engineering applications

The electrospinning process was applied to fabricate the nanofibers of biodegradable poly(ε-caprolactone)(PCL) in which different contents of multiwalled carbon nanotubes(MWCNTs) were embedded. Afterward,the electrospun nanofibers were successfully decorated with shish-kebab structure via a self-induced crystallization technique. The topographical features and the mechanical properties of the composite scaffolds were characterized,and the biocompatibility of the material was assessed by using human osteogenic sarcoma osteoblasts(MG-63 cells). The carbon nanotube(CNT) concentration is found to affect the fiber diameter and mechanical properties of electrospun nanofibers and the periodic distance of the shish-kebab architecture. Cellular attachment and proliferation assays reveal that 0.5 wt% CNT-embedded PCL scaffold shows enhanced biocompatibility with MG-63 cells than their counterparts made of neat PCL, and the collagen-like nanotopology provided by the shish-kebab structure further facilitates the cell adhesion and proliferation. The superior interactions between cells and scaffolds demonstrate that the shish-kebab-structured CNTs/PCL nanofibers may be promising candidate for tissue engineering scaffold application.     

多孔有机膨润土颗粒研制及对PO3-4的吸附研究

将易燃微粉按一定比例混入膨润土中,挤压造粒,高温灼烧,再用阳离子表面活性剂改性,得到多孔有机膨润土颗粒.将其用于对PO3-4离子的吸附,研究了酸度、吸附时间、PO3-4离子的初始浓度对吸附反应的影响,指出该吸附过程符合Langmuir吸附等温方程.     

湘西地区开发建设中的主要环境问题及保护对策

简要介绍了湖南湘西地区开发建设的基本概况，开发建设中存在的主要环境问题及保护对策。     

矿井涌水量预测的一种新方法

本文根据矿井涌水量变化特点，首次引用作者在文1中提出的灰色──周期外延组合预测模型。经实践证明，应用效果很好。对矿井防治水工作有指导意义。