ZrCuAlNi系大块金属玻璃的非晶形成能力、热学和力学性能（英文）

分析ZrCuAlNi系大块金属玻璃的非晶形成能力、热学和力学性能。运用密实堆积和动态脆性指数模型从理论上确定合金的成分。采用铜模吸铸法在氩气保护下制备圆柱形和圆锥形铸锭。用X射线衍射表征圆锥形铸锭以便确定非晶结构。结果表明:两种合金的临界非晶直径为3 mm。用差示扫描量热法(DSC)分析其热行为,加热速率分别为0.5、0.67和0.83 K/s。γ参数、过冷液相区ΔT_x和约化玻璃转变温度T_(rg)等这些实验所得的参数均表明其具有高的非晶形成能力。非晶成分显示其脆性指数为40。合金的压缩试验采用的应变速率为0.016 s~(-1),得到弹性模量约为83 GPa,总应变约为5%,屈服强度为1.6 GPa,硬度为4 GPa。运用密实堆积和动态脆性指数模拟可以预测ZrCuAlNi系合金的非晶形成成分。     

由刨花金属短纤维制备技术用金属纱线

目前,德国纺织机械和高性能材料技术研究所(ITM)正对刨花金属短纤维纺制纱线的工艺过程进行广泛的调查研究。为顺利纺纱,必须考虑这类纤维的高耐磨性、高脆性和高刚性等特性,以及它们较高的塑性变形和粘滑运动倾向。基于传统成纱工艺,开发出以刨花金属短纤维为原料,经拉伸断裂、牵伸和纺纱过程制备纯金属纱线的纺纱工艺链。基于目前的研究,由刨花金属短纤维制备纯金属纱线的可行性已得以证实。所得金属纤维在高性能、低成本技术应用方面具有较高的潜力。     

Critical parameters near the ferromagnetic-paramagnetic phase transition in La0.67–xYxBa0.23Ca0.1MnO3 compounds（x=0.10 and x=0.15）

The critical properties of the mixed manganite La0.67–x Y x Ba0.23Ca0.1Mn O3 with x=0.10 and x=0.15 around the paramagnetic(PM)-ferromagnetic(FM) phase transition were investigated through various techniques. These involved modified Arrott plots, Kouvel-Fisher method and Widom scaling relation. Magnetic data, analyzed in the critical region, using the above methods, yielded the critical exponents for(x=0.10) La0.57Y0.10Ba0.23Ca0.1Mn O3(β=0.312±0.002 and γ=1.147±0.003 at T C=299.23±0.05 K). Moreover, the estimated critical exponents of(x=0.15) La0.52Y0.15Ba0.23Ca0.1Mn O3 were β=0.286±0.004 and γ=0.943±0.002 at T C=289.53±0.06 K. The critical exponents’ values were close to the theoretical values of 3D-Ising model and tricritical mean-field model. These results suggested that the present composition should be close to a tricritical point in the La0.67–x Y x Ba0.23Ca0.1Mn O3 phase diagram. Expressing the field dependence as ΔS M∝H n allowed us to establish a relationship between the exponent n and the critical exponents of the material and to propose a phenomenological universal curve for the field dependence of ΔS M.     

表面粗糙和带槽的湿式离合器接合的有限元模型

已经开发了一个有限元模型,研究表面粗糙和带槽纸质可渗透的湿式离合器的接合特性。采用有限元方法(Galerkin)离散修正雷诺和力平衡方程式,采用等参量方程式解所描述的有关内何学。通过Patir和Cheng(1978)的通用流量模型模拟表面粗糙度的影响。在表面粗糙状况下,采用Greenwond和William son(1966)方法计算负荷分配,采用开发的有限元模型研究所加负荷的影响,以及湿式离合器摩擦材料的渗透率和槽出入口尺寸的接合特性(即转矩、油压、接合时间和油膜厚度)。研究结果表明,所加负荷、摩擦材料渗透率和槽宽度对接合特性的影响显著。高的配合面压力增大了峰值和减少了接合时间但显著增大了峰值转矩,宽油槽减少峰值转矩和增加了接合时间。对于本模型油槽深度对接合特性的影响不太明显。     

缺乏地质封存条件地区开展CCUS项目集群化建设的可行性研究:以江西省为例

碳捕集、利用与封存（CCUS）技术是我国实现碳达峰和碳中和目标的关键技术。良好的 源汇匹配条件是CCUS项目部署的重要先决条件。然而我国存在一些缺乏地质封存条件的地区，虽然区域内拥有较多工业排放源，但缺少近距离的潜在封存地，影响了企业的投资决策。CCUS项目的集群化建设可以通过共用CO2运输和封存设备，降低项目的整体成本，集群化建设能否推动缺乏地质封存条件地区CCUS项目的部署，需要进一步研究。以江西省为例，选取南昌市和萍乡市的7个公开披露碳排放信息的企业，分别开展年捕集量为 100万t的碳捕集项目，通过管网优化并选取江汉盆地为潜在封存地，建立成本分析模型 并计算单位减排成本。结果显示，虽然集群项目的运输距离长达513 km，但最终的CO2 减排成本仅为473.04元/t，而且还存在进一步下降的可能。在缺乏地质封存条件的地区开展CCUS项目的集群化建设，可以成为利用CCUS技术助力碳中和的一个重要方式。     

Thermo-economic analysis of a direct supercritical CO2 electric power generation system using geothermal heat

A comprehensive thermo-economic model combining a geothermal heat mining system and a direct supercritical CO₂ turbine expansion electric power generation system was proposed in this paper. Assisted by this integrated model, thermo-economic and optimization analyses for the key design parameters of the whole system including the geothermal well pattern and operational conditions were performed to obtain a minimal levelized cost of electricity (LCOE). Specifically, in geothermal heat extraction simulation, an integrated wellbore-reservoir system model (T2Well/ECO2N) was used to generate a database for creating a fast, predictive, and compatible geothermal heat mining model by employing a response surface methodology. A parametric study was conducted to demonstrate the impact of turbine discharge pressure, injection and production well distance, CO₂ injection flowrate, CO₂ injection temperature, and monitored production well bottom pressure on LCOE, system thermal efficiency, and capital cost. It was found that for a 100 MW_e power plant, a minimal LCOE of $0.177/kWh was achieved for a 20-year steady operation without considering CO₂ sequestration credit. In addition, when CO₂ sequestration credit is $1.00/t, an LCOE breakeven point compared to a conventional geothermal power plant is achieved and a breakpoint for generating electric power generation at no cost was achieved for a sequestration credit of $2.05/t.     

Research of modes of electropulse processing for an intensification of processes of deformation of trumpet preparations from titanic alloys

The growing requirements to accuracy of manufacturing of details of flying devices including fromti-tanic alloys,results in substantial growth of labour input of their manufacturing.It speaks that titanic al-loys have rather low module of elasticity,high durability,resilient after removal of loading that results innecessity of performance of honing works after manufacturingfromthemdetails.Nowштамповочноеmanu-facture has progressive the equipment and new ways of punching of details …     

爆破工作及其对空气冲击波形成的影响

绍里亚山区和哈卡斯各地下矿山开采的矿体,为厚达80米的扁豆状和柱状矿体,沿走向长达1200米。矿体倾角70°～90°。矿石为致密的磁铁矿,裂隙少,普氏硬度系数f=8～18,多为     

各种移动式破碎机的应用实例

使用“移动式破碎机-胶带运输机”联合系统取代汽车从采场往加工厂运输原料的趋势,正日益引起人们的关注。目前世界各地约有100台各种大型移动式设备投入使用。在破碎机移动次数较少的采场,半移动式破碎设备使用单独的履带式运输装置具有重要意义。泰国某褐煤矿用3台这种类型的     

多姆金矿薄矿脉的机械化开采

多姆金矿位于加拿大安大略省的蒂明斯,由多姆矿山有限公司拥有和经营。1910年以来,产量不断增长,到1984年,已从日产1814吨增到2721吨。矿山至少有六种不同类型的矿体。但大致可分为厚矿体和薄矿脉两大类。前者呈透镜状,厚度变化在10米至40米之间;薄矿脉由石英和石英-铁白云石组成,厚度由几厘米到6米,平均倾角65°。