Effect of Ce-rich misch metal addition on squeeze cast microstructure and mechanical properties of AZ81 alloy

The effect of cerium-rich misch metal addition on the microstructure and properties of squeeze cast magnesium alloys AZ81 was empirically investigated.The results indicate that the addition of cerium-rich misch metal modifies the microstructure gradually.With the increase of the RE addition,the amount of Mg_(17)Al_(12) decreases while that of Al_(11)(RE)_3 increases,accompanied by grain refinement.When the addition reaches 1.5%,the grain refinement becomes obvious.However,when the addition exceeds 2.0%, ...     

Aufzugstriebwerksraum; Geb?udeumriss

Aufzugstriebwerksr?ume dürfen nur mit dem als raumbildenden Dachaufbau zu wertenden Teil bei der Berechnung des Geb?udeumrisses au?er Betracht bleiben.     

Pseudocomplemented lattice effect algebras and existence of states

We prove that in every pseudocomplemented atomic lattice effect algebra the subset of all pseudocomplements is a Boolean algebra including the set of sharp elements as a subalgebra. As an application, we show families of effect algebras for which the existence of a pseudocomplementation implies the existence of states. These states can be obtained by smearing of states existing on the Boolean algebra of sharp elements.     

‘Multiplying Statues by Machinery’: Stereoscopic Photographs of Sculptures at the 1862 International Exhibition

This article focuses on the photographs of sculptures, in particular Raffaelle Monti’s veiled figures, taken by the London Stereoscopic and Photographic Company at the 1862 International Exhibition, to explore the relationship between vision and touch in the appeal of stereographs. Their apparent simplicity as reproductions of works of art belies a rich formal and conceptual complexity that attends to many of the issues raised by the Exhibition and its critics, at the time and since. The appeal of stereographs of sculptures can be conceptualised in the consonance between sculpture and photography as media that relied on mechanical production and reproduction, making the shift from sculpture to stereo one of different iterations rather than translation from one medium to another – both relied on the disavowal of the anonymous, mechanical labour that went into making them.     

Two-step extended RKN methods for oscillatory systems

In this paper, two-step extended Runge–Kutta–Nyström-type methods for the numerical integration of perturbed oscillators are presented and studied. The new methods inherit the framework of two-step hybrid methods and are adapted to the special feature of the true flows in both the internal stages and the updates. Based on the EN-trees theory [H.L. Yang, X.Y. Wu, X. You, Y.L. Fang, Extended RKN-type methods for numerical integration of perturbed oscillators, Comput. Phys. Comm. 180 (2009) 1777–1794], order conditions for the new methods are derived via the BBT-series defined on the set BT of branches and the BBWT-series defined on the subset BWT of BT. The stability and phase properties are analyzed. Numerical experiments show the applicability and efficiency of our new methods in comparison with the well-known high quality methods proposed in the scientific literature.     

华庆地区长81储层微观孔隙结构特征研究

通过铸体薄片、高压压汞、核磁共振以及恒速压汞等测试化验手段,深入研究了鄂尔多斯盆地华庆地区长81储层的微观孔隙结构特征,并分析了微观孔隙结构对流体微观赋存状态及其可流动性的影响。结果表明:华庆地区长81储层微观孔隙结构类型复杂,其中粒间孔-溶蚀孔孔隙组合类型连通性较好,孔喉半径较大,可动流体饱和度高,是有利于孔隙流体渗流的优势通道。孔喉类型、孔喉连通性、孔喉半径以及黏土矿物含量综合影响着孔隙流体的赋存状态及其可流动性,其中喉道大小对储层流体的渗流能力起主要控制作用,尤其是大喉道对储层渗流能力的改善具有明显优势。     

基于32位超高速RISC体系处理器之SoC平台的Linux2.6操作系统

本文介绍如何在兼容ARMV4指令集的32位超高速RISC处理器（FA626）所构建的SoC平台上（即FIE8180），运用智原科技所提供的FA626-Linux开发包通过armboot装载Linux2．6操作系统。使开发人员可以在基于FIE8180 SoC的仿真平台-MediaCreative!上进行二次开发和验证设计。     

81枪族击发机可靠性分析及结构改进

可靠性是评价武器系统性能优劣的重要指标之一,通过对81枪族击发机的可靠性进行综合分析,提出了机构工作安全保险的概念,并认为81枪族击发机在结构设计上缺少机构工作安全保险中的零件位置不正确保险,存在事故隐患。针对这一情况,提出了对击发机结构的改进方案,并应用AUOTCAD软件进行计算机模拟,得出改进后的扳机限制突笋高度值,通过试验验证,改进后的击发机工作可靠性提高,且不影响枪械其它各动作的顺利进行。