The solid solution structure of BiSr x Ca1−x O2.50

The formation and solid-solution structure of BiSr _x Ca_1–x O_2.50 were studied by X-ray powder diffraction analysis, and the crystallography data of the phase are given. The crystal structure of BiSr _x Ca_1–x O_2.50 belongs to the monoclinic system with space group P1m1 or P12/m1, and the cell parameters for BiCaO_2.50 (x=0.00) are a=1.8363 nm, b=0.5366 nm, c= 1.4670 nm and =100.26°. BiSr _x Ca_1–x O_2.50 is a solid solution of Bi-Ca-O and Bi-Sr-O. When the strontium solid solubility Sr/Sr+Ca=0.50, the strontium dissolved in the phase reaches saturation, while the strontium solid solubility limit of the phase is between 0.67 and 0.75, and beyond this limit the crystal structure is greatly distorted.     

Dense AlN/FeSiAl composite ceramics with high thermal conductivity and strong microwave absorption

Journal of Materials Science: Materials in Electronics - A series of AlN/x wt% FeSiAl composite ceramics with 4 wt% Y2O3 sintering aid was fabricated by pressureless sintering in a nitrogen...     

Hierarchical NiCo@NiOOH@CoMoO4 Core–Shell Heterostructure on Carbon Cloth for High-Performance Asymmetric Supercapacitors

The fabrication of low-cost, effective, and highly integrated nanostructured materials through simple and reproducible methods for high-energy-density supercapacitors is highly desirable. Herein, an activated carbon cloth (ACC) is designed as the functional scaffold for supercapacitors and treated hydrothermally to deposit NiCo nanoneedles working as internal core, followed by a dip-dry coating of NiOOH nanoflakes core–shell and uniform hydrothermal deposition of CoMoO₄ nanosheets serving as an external shell. The structured core–shell heterostructure ACC@NiCo@NiOOH@CoMoO₄ electrode resulted in exceptional specific areal capacitance of 2920 mF cm⁻² and exceptional cycling stability for 10 000 cycles. Moreover, the fabricated electrode is developed into an asymmetric supercapacitor which demonstrates excellent areal capacitance, energy density, and power density within the broad potential window of 1.7 V with a cycling life of 92.4% after 10 000 charge–discharge cycles, which reflects excellent cycle life. The distinctive core–shell structure, highly conductive substrate, and synergetic effect of coated material results in more electrochemical active sites and flanges for effective electrons and ion transportation. This unique technique provides a new perspective for cost-efficient supercapacitor applications.     

Characterization of Co-doped birnessites and application for removal of lead and arsenite

Nanostructured Co-doped birnessites were successfully synthesized, and their application for the removal of Pb(2+) and As(III) from aquatic systems was investigated. Powder X-ray diffraction, chemical analysis, nitrogen physical adsorption, field emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectroscopy (XPS) were used to characterize the crystal structure, chemical composition, micromorphologies and surface properties of the birnessites. Doping cobalt into the layer of birnessite had little effect on its crystal structure and micromorphology. Both chemical and XPS analyses showed that the manganese average oxidation state (Mn AOS) decreased after cobalt doping. The Co dopant existed mainly in the form of Co(III)OOH in the birnessite structure. Part of the doped Co(3+) substituted for Mn(4+), resulting in the gain of negative charge of the layer and an increase in the content of the hydroxyl group, which accounted for the improved Pb(2+) adsorption capacity. The maximum capacity of Pb(2+) adsorption on HB, CoB5, CoB10 and CoB20 was 2538 mmol kg(-1), 2798 mmol kg(-1), 2932 mmol kg(-1) and 3146 mmol kg(-1), respectively. The total As(III) removal from solution was 94.30% for CoB5 and 100% for both CoB10 and CoB20, compared to 92.03% for undoped HB, by oxidation, adsorption and fixation, simultaneously.     

微型静电悬浮Z向加速度计的计算机模拟

本工作针对一种新型的电容式力平衡加速度计－微型静电悬浮Ｚ向加速度进行了计算机模拟。模拟中的Ｚ向加速度计拟采用微机械加工技术在硅片上制作，利用静电悬浮原理平衡质量块，感应加速度并输出信号。计算机模拟分析了加速度计的悬浮特性，稳定特性，响应特性。对Ｃ－Ｆ转换电路的输出特性也进行了分析，该电路可用ＣＭＯＳ工艺集成在加速度传感器的周围。模拟结果表明该加速度计的悬浮特性，稳定特性，响应特性。对Ｃ－Ｆ转换电路     

Collaboration of large equipment complete service under cloud manufacturing mode

This paper focuses on the need of the large equipment manufacturing industry to adapt collaborative operation to transform the industry to cloud manufacturing services and to solve the new problem of federal resources coordination in complete service operation. We systematically study federal resources cooperation under cloud manufacturing mode to complete a large complex project. The primary research contents are divided into four points. First, a system structure of cloud manufacturing service mode is presented. Second, a synergy logic framework from the global system perspective is designed based on generalised partial global planning. Third, a multi-level system coordination mechanism is established by integrating various methods, including the bidding game mechanism for enterprise external resources, the planning control mechanisms for enterprise internal resource and the global collaborative optimisation mechanism for enterprise global federal resources. Finally, a cloud manufacturing service platform for a typical enterprise is developed by combining theory with practice. The results can realise collaborative management in resource selection and configuration, service process planning control and service information feedback in cloud manufacturing service, as well as achieve overall synergy effect for the system.     

6082-T6回填式搅拌摩擦点焊热-流耦合分析

为了解释了回填式搅拌摩擦点焊的连接机理,本文根据6082-T6铝合金回填式搅拌摩擦点焊焊接过程的特点,建立了简化的热源模型,利用有限元分析软件ANSYS模拟出焊接过程中的温度场,进而耦合得到其应力场.结果表明:随着焊接过程的进行,铝合金6082-T6最高温度分布在袖筒1/2处,焊点处粘塑性金属的最大流动速度出现在铝合金上表面袖筒内侧区域;通过分析模拟过程中流体流动的流线与试验测量所得接头形貌照片,得到流场的分布规律.     

考虑水-温循环的SBS改性沥青复数剪切模量预估模型

为探寻季节性冻土区多次水-温循环后沥青胶结料特征官能团变化与复数剪切模量之间的关系,联合FTIR和动态剪切流变（DSR）试验,对经0、3、6、9、12、15和18次水-温循环后的苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）改性沥青进行测试,探明了多次水-温循环下SBS改性沥青复数剪切模量和特征官能团的变化规律;采用灰色关联熵分析理论数学模型,明确了复数剪切模量与特征官能团含量变化的关联程度;基于麦夸特法和通用全局优化算法对不同温度和频率下DSR测试的SBS改性沥青复数剪切模量G*及FTIR测试官能团变化指数进行多元统计回归分析,提出了SBS改性沥青复数剪切模量的预估模型。结果表明:多次水-温循环使沥青发生了水-温老化,但SBS改性剂对沥青水-温老化具有抑制作用;随着水-温循环次数的增加,沥青FTIR图谱中亚砜基与羰基呈现出明显的增大趋势;SBS改性沥青特征官能团变化对复数剪切模量影响程度由大到小的排序为脂肪族化物 > 非对称脂肪族化物 > 芳香族化合物 > SBS含量（苯乙烯+丁二烯） > 亚砜基 > 羰基;多次水-温循环后SBS改性沥青复数剪切模量随着特征官能团含量变化呈现出多元线性关系。      

国产氧化铝粉体的改性及其烧结性能研究

通过某国产氧化铝粉体的研磨和分散,得到颗粒粒度分布窄、颗粒大小均匀的氧化铝粉体;添加氧化镁为烧结助剂,分别进行无压烧结和真空烧结,研究了烧结温度对氧化铝陶瓷的相对密度、显微结构、抗弯强度和直线透过率的影响.在1 500℃无压烧结样品晶粒尺寸为2-3 μm,抗弯强度达到545 MPa; 1 850℃真空烧结样品的晶粒尺寸为20-30 μm,直线透过率(600 nm)达到32%.     

辽宁五龙金矿床成因与成矿模式探讨

辽宁五龙金矿床是以断裂控矿为主的大型金矿床，其导矿构造、配矿构造、容矿袖造均为不同规模的断裂，构成一个断裂构造成矿体系。笔者以现场地质事实为依据，通过细致的研究认为，该矿床属于大型高中温岩浆热液金矿床，具有明显的2个不同成矿特征的成矿梯段，并建立了该矿区的成矿模式，为今后地质探矿提供了理论依据。