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Millipede Forming is a novel metal forming method that has been proposed and developed recently.It can be applied to overcome fundamental limitations in conventional roll forming,and,in addition,used for incremental forging and integrated into a strip casting or extrusion process for downstream thickness reduction. In this new method,there are two main principles:①the use of an optimal transitional surface or space linking of the incoming material to the outgoing product,and②implementation of a method to... 相似文献
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Y. L. Zhang) G. Spinks) ) Departmentof Mechanical Engineering Ngee Ann Polytechnic Clementi Road Singapore) Intelligent Polymer Research Institute University of Wollongong Northfields Ave Wollongong NSW Australia 《金属学报(英文版)》1999,12(4):421-426
1.IntroductionRecently,therehasbeenanupsurgeofinterestinthepreventionofcorrosionofsteelthroughtheuseofconductivepolymercoatings〔1〕.Unfortunately,poorcoatingadhesivedurability,whichhadoftenbeenencounteredduringcoatingemploied,limitedtheapplicationofco… 相似文献
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Synthesis of Al_2O_3-SiC Composite and Its Effect on the Properties of Low-carbon MgO-C Refractories
Beiyue Ma) Qiang Zhu ) Yong Sun Jingkun Yu) Ying Li) ) School of Materials Metallurgy Northeastern University Shenyang China ) Faculty of Engineering University of Wollongong Wollongong NSW Australia 《材料科学技术学报》2010,26(8):715-720
Al2O3-SiC composite was synthesized with pyrophyllite and natural graphite as raw materials by carbothermal reduction reaction under argon atmosphere. The effect of synthesis temperature on phase composition and microstructure was investigated. Low-carbon MgO-C refractories were prepared by using the synthesized Al2O3-SiC composite as additive. The effect of its addition on the slag penetration and corrosion resistance as well as oxidation resistance of the refractories was investigated, and the slag resist... 相似文献
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In this study,the authors proposed a new algorism which can simultaneously meets the strip shape control criterion and the strip crown control criterion.Based on the new algorism,the pass schedule is optimized to maximize the allowable PC angle range.To calculate the objective value for optimization of pass schedule,a slab method has been integrated with the roll stack deformation to simulate the strip profile. 相似文献
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为改善晶态V2O5(c-V2O5)正极材料实际容量较低、循环性能较差等问题,制备了空心球聚吡咯/V2O5复合材料。利用导电吡咯单体(Py)在中空型V2O5层间发生原位氧化聚合反应制备聚吡咯(PPy)/中空型V2O5复合材料(HS-PPy/V2O5)。采用X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)对样品进行表征,采用恒流充放电测试和电化学阻抗(EIS)测试样品的电化学性能。结果表明,Py单体已插入中空型V2O5层间,与纯中空型V2O5相比,制备的HS-PPY/V2O5复合材料比容量虽然有所减小,但是循环稳定性有较大的提高。 相似文献
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基于铁法矿区高瓦斯低透气性煤层群地质及开采技术条件,采用物理模拟方法系统分析了煤层群不同开采顺序时采动裂隙演化特征,运用CFD(Computational Fluid Dynamics)Fluent分析了U型负压通风条件下采空区瓦斯流动规律,总结了铁法矿区卸压煤层气抽采钻孔布置原则。研究结果表明:回采巷道内侧约在工作面倾斜长度的1/3处为采动裂隙发育区、距回风巷30~80 m范围为高浓度瓦斯富集区。铁法矿区煤层气抽采钻孔布置的原则为:垂直方向上钻孔终孔位置布置在断裂带下1/3处、地面钻井的合理间距不小于100~150 m、沿工作面倾斜方向靠回风巷(1/3~1/2)工作面斜长范围为最佳的钻孔位置。 相似文献
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JIANG Zhenyi XIE Haibo WEI Dongbin School of Mechanical Materials Mechatronic Engineering University of Wollongong Wollongong NSW Australia 《Baosteel Technical Research》2010,(Z1)
In this paper,the mechanics of strip edge cracks and its propagation has been studied,and the effects of strip edge drop and stress intensity factor(SIF) on edge crack defections during cold rolling of thin strip have been discussed.An experimental investigation was presented into the effect of strip edge drop on edge cracks during cold rolling of thin strip.The edge crack increases significantly due to more inhomogeneous deformation and work hardening at the strip edge.The effective stress intensity fac... 相似文献
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Group signature schemes allow a member of a group to sign messages anonymously on behalf of the group. In case of later dispute, a designated group manager can revoke the anonymity and identify the originator of a signature. In Asiacrypt2004, Nguyen and Safavi-Naini proposed a group signature scheme that has a constant-sized public key and signature length, and more importantly, their group signature scheme does not require trapdoor. Their scheme is very efficient and the sizes of signatures are smaller than those of the other existing schemes. In this paper, we point out that Nguyen and Safavi-Naini's scheme is insecure. In particular, it is shown in our cryptanalysis of the scheme that it allows a non-member of the group to sign on behalf of the group. And the resulting signature convinces any third party that a member of the group has indeed generated such a signature, although none of the members has done so. Therefore is in case of dispute, even the group manager cannot identify who has signed the message. In the paper a new scheme that does not suffer from this problem is provided. 相似文献
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