Structures of bulk amorphous Zr41Til4Nil0Cul2.5Be22.5 alloy in amorphous, crystalline, supercooled liquid and liquid states

The amorphous and crystal structures of Zr41Til4Nil0Cul2.5 Be22.5 alloy have been analyzed with X-ray dif[ractometer. The structures of bulk amorphous Zr41Til4 Nil0Cul2.5B22.5 alloy in solid, supercooled liquid and liquid states are almost of the same structure. The RDFs (Radius Distribution Function), the first coordination number, the first coordination radius, the correlation radius and atom number of the cluster were calculated for bulk amorphous Zr41Til4Nil0Cul2.5B22.5 alloy in different states. The first coordination sphere radii and the first coordination numbers are 0.312nm, 11.2 in solid state, 0.301 nm, 10.932 in supercooled liquid region and 0.305nm, 11.296 in liquid state.The crystal structure of Zr41Til4Nil0Cu12.5B22.5 alloy is consisted of several intermetallic compounds which are CuZr2,Be2Zr, etc. The reason of formation glass for this alloy is that there is a larger resistance for atoms to rearrange and form intermetallic comnounds in a long range order.     

Influence of process parameters on thermal-rate treatment of ZA42 alloy

Sand casting process and directional solidification technique combining thermal-rate treatment(TRT) were used. The influence of process parameters on TRT was investigated according to the values of impact toughness. At the same time, the mechanism of TRT was discussed. The results showed that TRT can improve the impact toughness of this alloy, while the hardness is basically constant. The time of heat preservation should not be more than 5min. Different forms of cooling intensification additive have different effects among which the zinc ingot solidified in graphite mold is the best one that can improve impact toughness of samples by more than 80%. With increasing the cooling temperature, the value of α(Al) crystal lattice constant increases. The element Sb has negative effect on TRT.     

柔索驱动并联机构的二型模糊神经逆控制

由于建立精确数学模型的困难以及控制过程中各种不确定性的存在, 柔索驱动并联机构的水平调节具有一定的难度. 针对该问题, 提出了一种基于二型模糊神经网络的逆控制方案. 该控制方案中的二型模糊神经网络实现了对水平调节过程逆动态的逼近以及对各种不确定性的处理. 采用迭代最小二乘算法对二型模糊神经网络区间权重进行了优化. 最后, 将基于二型模糊神经网络的逆控制方案在实际的控制对象上进行了实验, 并与其相对应的基于一型模糊神经网络的逆控制方案进行了比较. 实验结果表明所提出的控制方案是有效的且采用二型模糊神经网络时能获得更好的控制效果.     

智能家居的“春天”来了

论述了智能家居的概念,着重阐述了智能家居及其核心技术的国内外发展历程,理清了智能家居的发展脉络。随后从技术、生产厂家、市场规模、消费者意识等方面论证了智能家居的“春天”已经来临。最后,对智能家居的未来发展进行了展望。     

Nd-Fe-B晶体生长特点及近快冷厚带制备技术的关键

简要叙述了Nd-Fe-B合金在平衡、非平衡条件下的凝固规律及其晶体生长特点。高性能烧结Nd—Fe-B磁体对母合金组织的要求(不含α—Fe，具有明显的柱状晶，柱状晶尺寸均匀，宽度在5～25μm之间，富Nd相有序排列，分布均匀)及Nd-Fe—B磁体在通讯、电子、医疗等行业的大量应用，促进了新兴近快冷厚带制备技术的诞生。系统阐述了新兴近快冷厚带制备技术的特点与优势；从柱状品的生长条件出发，重点说明了诸如化学成分优化、氧含量、温度场、冷却速度等关键工艺参数的控制原则。     

茅山断裂延伸带的初探

据区测队资料和卫星照片解释,江苏省南部溧水、高淳、金坛等县境内近南北走向的茅山山脉的东西两侧,皆有一条北北东向的大断层,茅山山脉是一个断裂带。1983年石油部门根据上党镇附近钻探资料,提出茅山断裂带可能向北延至镇江附近。笔者在镇江一带矿井地质调查时也证实这一推断,从     

Microstructural Characterization of Novel Ni-Containing Nd-Fe-B Strips by Strip Casting

The characteristics of novel Nd-Fe （Ni, Co, Al ）-B microstructure prepared by strip casting technique were studied. The novel microstructure was observed using scanning electron microscope （SEM） and transmission electron microscope （TEM）. Along the direction of heat flow, there are two kinds of different microstructures. Close to the wheel side, there is a thick layer containing many polygonal Nd2Fe14B grains. Near the free surface side, however, there are relative uniform platelike Nd2Fe14B grains whose growth direction is not completely the direction of the heat flow during solidification. The formation of the novel microstructure is presumed to be the contribution of the special temperature field and Ni component.     

基于物流的铸造用材料成本测算软件的构架

为了便于铸钢件生产材料的管理和成本测算程序化 ,作者引进物流管理理念 ,以VC + +和PowerBuilder6 .0为开发工具 ,采用面向对象(OOP)技术研究开发了一套基于物流的铸钢件生产材料成本测算软件CACE (ComputerAidedCostEs timation) .本软件通过与铸造工艺CAD的数据接口成功实现了系统集成以及对CAD数据的读取、查询、保存等管理工作 .利用该软件可进行产品材料的定额管理 ,达到合理使用资源、节约材料的目的     

全氯型Pt-Re/γ-Al_2O_3重整催化剂氯含量的控制

本文探讨了全氯型Pt-Re/γ-Al_2O_3催化剂在工业装置运转、再生和氯化更新等过程中氯含量的控制问题.