ZY6400型液压支架多通块的改型设计

针对多通块原设计中的整体式结构所带来的工艺复杂,产品合格率低,制造成本高等弊端,将其改型为用螺栓联接上下2片的分体式结构,收到了良好的效益。     

高线减定径区带肋钢筋堆钢问题的解决

通过对高速线材生产线在生产带肋钢筋盘条时减定径区堆钢原因的分析，对成品孔型和进、出口导卫进行丁改进，从而使因堆钢而造成的平均事故时间由原来的40min／班减少至5min／班。     

An experimental study on bubble growth within a narrow space under an interference‐piece

An experimental study was performed on the nucleate boiling of water in the narrow space formed between an interference piece and the heating surface of heat‐proof glass. A past study analyzed the bubble growth due to the conduction of heat through the thinner liquid layer under a growing bubble; however, the thickness of the liquid layer was not shown experimentally. This study investigates the thickness of this thinner layer by the interference method. Almost no change was found on the thickness of the liquid layer under both the interference‐piece and on the heating surface. The experimental results indicate the great contribution of superheating of the test liquid to bubble growth. © 2006 Wiley Periodicals, Inc. Heat Trans Asian Res, 35(2): 165–177, 2006; Published online in Wiley InterScience ( www.interscience. wiley.com ). DOI 10.1002/htj.20100     

中厚板轧机辊道受力情况模拟分析

采用ANSYS／LS—DYNA有限元软件模拟计算了中厚板生产中轧机前后辊道在轧件头部平直、头部弯曲、轧件已离开轧机、轧件未离开轧机等不同情况下所受冲击载荷的等效应力，得出在轧件已离开轧机情况下，与辊道发生对心碰撞时辊道所受应力最大；在未抛钢情况下，辊道所受应力远大于前者，且在轧件头部下弯量达60mm时，辊道所受应力已超出其材料许用应力。     

莆田市体育中心大型劲性柱施工

本文将 结 合某 一 工程 实例 ,概 述 劲性 混凝 土 柱结 构的 复 杂施 工过 程 ,介 绍钢 筋及 铁件 预 埋、安装 、一级 焊 缝焊 接、钢 筋绑 扎 等方 面 所采 用的 技术 措 施和 施 工经 验。     

关于隧道二极管电路

隧道二极管的伏安特性是一条“N”形的曲线，含有隧道二极管的电路是一种非线性电路。研究非线性电路的一种有效方法是分段线性化法,它的特点是把非线性的求解过程分成几个线性区段，对每一个线性区段再应用线性电路的分析方法。本文完整地阐述了分段线性化法的步骤，对如何建立线性化后的方程，进行了较详细的讨论，并在每一个线性区段，建立求解工作点的一组线性方程。最后求解这些方程，它们的有效解就是隧道二极管电路实际的工作点。     

现浇无粘结预应力圆孔板施工质量控制

分析了现浇无粘结预应力圆孔板施工的工艺原理，从模板、钢筋、空心管、混凝土、预应力等工程方面介绍了其施工质量控制措施，以使该施工技术得到更广泛地应用和推广。     

Sφ1000内球面的靠模加工

改变了传统的刚性固定靠模加工球面的局限性 ,制造了抽拉式靠模装置 ,重点介绍该装置的结构特点、使用方法、主要参数的选择以及加工精度的分析。该装置结构简单、安装调试方便。     

Application of piece‐wise linear weight functions for 2D 8‐node quadrilateral element in contact problems

The present study is a continuation of our previous work with the aim to reduce problems caused by standard higher order elements in contact problems. The difficulties can be attributed to the inherent property of the Galerkin method which gives uneven distributions of nodal forces resulting in oscillating contact pressures. The proposed remedy is use of piece‐wise linear weight functions. The methods to establish stiffness and/or mass matrix for 8‐node quadrilateral element in 2D are presented, i.e. the condensing and direct procedures. The energy and nodal displacement error norms are also checked to establish the convergence ratio. Interpretation of calculated contact pressures is discussed. Two new 2D 8‐node quadrilateral elements, QUAD8C and QUAD8D, are derived and tested in many examples, which show their good performance in contact problems. Copyright © 2004 John Wiley & Sons, Ltd.     

钢带试样位向及拉伸性能的探讨

从碳素结构钢热轧钢带各向异性的事实出发 ,阐述不同试样位向导致同一钢带不同的拉伸性能 ,因而影响钢带合格与否的判定。在全面考虑钢带和焊管标准的基础上 ,提出解决钢带判定的两种方法。同时 ,还对标准中存在的缺点作了说明 ,提出改进意见 ,供标准修订时参考。