Hydrothermally stable mesoporous aluminosilicates with moderate acidity via degradation-assembly process and improved catalytic properties

Mesoporous aluminosilicates with hydrothermal stability and moderate acidity are synthesized via assembly of microporous zeolite precursors obtained by the degradation of zeolite NaY, denoted as “degradation-assembly” (DA) technique. By controlling the degradation degree of matrix NaY, precursors with larger spatial volume and stronger rigidity will be obtained. The characterization results showed that the walls of the mesophase in MDA (mesoporous aluminosilicate obtained by “DA” method) composed of the preformed zeolite Y building units and the moderate acidity was inherited from the introduced precursors. It was suggested that the more mature assembly units accounted for the increased acidity of MDA with more Al species retained in the framework of mesophases. The resulting aluminosilicates with simultaneously moderate acidity and hydrothermal stability showed superior catalytic properties when used in heavy oil catalytic cracking catalysts.     

不同调理剂对胜利油田污水厂污泥热值的影响

对检测城市污水厂脱水污泥热值的方法进行分析,认为《煤的发热量检测方法》(GB/T 213—2008)对污泥热值的检测更适用。胜利油田城市污水厂脱水污泥按不同比例与6种调理剂复混发酵后,腐熟堆肥热值均有不同提高,均适于为单独焚烧提供热能。     

共价有机骨架聚合物(COFs)的研究进展

共价有机骨架聚合物(COFs)是一类结晶微孔聚合物,具有优异的孔性质、高的热及化学稳定性和大的比表面积,在气体储存、催化、光电材料等诸多领域中有重要的应用前景,已成为国内外的研究热点。简要介绍了共价有机骨架聚合物的合成方法,最后对该领域未来发展趋势进行了展望。     

模块化高温气冷堆反应堆设计重点安全问题分析

本文介绍了模块化高温气冷堆的安全特点,对反应堆堆芯设计核安全审评重点关注的核安全问题进行了分析,并提出解决方案以供设计和审评人员参考。     

Ytterbium ion promotes apoptosis of primary mouse bone marrow stromal cells

One of the main target organs for the lanthanides(Ln) is bone. Previous studies revealed that ytterbium(Yb) produced damage to the skeletal system in vivo. But the effects of Yb3+ on bone marrow stromal cells(BMSCs) in vitro had not been reported. In this paper, cell viability, apoptosis, mitochondrial membrane potential(MMP), reactive oxygen species(ROS) and lactate dehydrogenase(LDH) were measured in order to study the effects of Yb3+ on BMSCs. The results indicated that Yb3+ displayed a slight positive effect on the BMSCs viability at concentrations of 1×10–6, 1×10–5, and 1×10–4 mol/L, but turned to decrease the viability of BMSCs at the highest concentration of 1×10–3 mol/L for 24, 48 and 72 h. Yb3+ at 1×10–3 mol/L promoted apoptosis of BMSCs, increased the levels of ROS and LDH, and decreased MMP in BMSCs. It suggested that the precipitate of Yb PO4 might decrease the viability of BMSCs. Yb3+ induced the apoptosis of BMSCs via mitochondrial pathway. The results might be useful for more rational application of Yb-based compounds in the future.     

面向摩擦学设计的凸轮挺柱三维接触应力分析

针对凸轮挺柱之间接触应力的传统理论计算方法简化过多的问题，在考虑凸轮摩擦学设计要求的基础上，对凸轮挺柱三维接触应力计算模型的建立进行了研究，并应用ANSYS软件对典型凸轮挺柱进行了接触应力计算分析，其结果不仅为凸轮挺柱机构的摩擦学设计提供了依据，也可用于常规设计中接触应力的校核。     

溶胶-凝胶法载银SiO2杂化膜的制备及性能研究

采用溶胶-凝胶法,在甲基化改性的SiO2溶胶中掺杂硝酸银,制备Ag/M-SiO2杂化膜。通过XRD、XPS、紫外-可见吸收谱、N2吸附-脱附以及气体渗透性能测试等方法,考察了银掺杂对杂化膜结构和性能的影响。结果表明,Ag/M-SiO2膜中的银元素完全为纳米金属银,具有面心立方结构。金属银的掺杂对Ag/M-SiO2膜的化学结构基本没有影响,但使其孔径和总孔体积略微增大。与未载银的SiO2膜相比,Ag/M-SiO2膜具有更大的H2渗透速率和更好的H2/CO2选择性。金属银的引入增强了H2的表面扩散作用,促进了H2在膜中的传递,提高了SiO2膜的水汽稳定性。     

矿井提升机变频节能优势与节能分析

本文分析了矿井提升机原来控方式的不足,近而提出了矿井提升机变频器调速方案。给出了提升机类变频器项目建设的理由和依据、提升系统的变频调速优点、改造后的用户收益、深入分析了提升机节能计算理论依据,通过实例的改造前后计算,得到实际节能效果。阐述了矿井提升机高压变频器实用性和未来社会效益及推广和应用前景。