全钛冷凝器主循环水系统的电偶腐蚀及其防护

现代舰船主循环水系统多采用全钛冷凝器，但采用全钛冷凝器对冷却系统中其它结构材料将产生电偶腐蚀作用，本文通过电偶腐蚀试验和系统腐蚀试验，查明了这种影响，并提出了防止钛合金对其它电位较负荷材料产生电腐蚀作用的措施。     

柴油桩锤应用及改进

本文主要分析柴油桩锤的工作原理,结合目前的应用及一些问题。阐述英国、德国、荷兰、日本等先进技术改进和发展,分析柴油桩锤的前景。     

嘉兴港岸线资源的管理与利用浅析

嘉兴港位于我国东部沿海,港口岸线资源丰富,岸线形状顺直,岸线是嘉兴市乃至浙北最宝贵的资源之一。近年来,嘉兴港加大了码头泊位的建设力度,促进了后方腹地经济的快速发展。为了深入贯彻"科学发展观",走可持续发展之路,确保嘉兴市港口资源的科学合理利用,本文对嘉兴市岸线资源的现状、码头泊位布局安排、使用管理及管理的不足和难点等进行了调查分析,并提出了相应的建设性措施方法,期供各方参考。     

我国公路连拱隧道施工工艺述评

通过对我国公路连拱隧道施工工艺的分类,对各种常用的工艺类型现状和总体施工工艺进行述评,并提出改进工艺的建议。     

Collapse strength of hatch cover of bulk carrier subjected to lateral pressure load

A series of elastoplastic large deflection FEM analyses has been performed on hatch covers of bulk carriers subjected to lateral load. Two types of hatch covers are considered which are the folding type and the side-sliding type. For the folding-type cover, one size is considered which is for Handy size bulk carrier, whilst for the side-sliding-type cover, two sizes are considered which are for Panamax and Cape size bulk carriers. For each type, two hatch covers are selected which are designed in accordance with the old ICLL rule and new IACS rule, respectively. Calculated collapse strengths are compared with individual design loads, and a strength assessment is performed. On the basis of collapse behaviour observed in FEM analyses, a simple method is proposed to evaluate the collapse strength of a hatch cover subjected to lateral load. It is confirmed that the collapse strength is accurately predicted by the proposed method.     

岩层破碎、地下水发育地段的路堑爆破施工技术

介绍胶新铁路某土石方工程在解决地下水发育、岩质分层节理破碎并伴有土夹石、爆破环境干挠大的情况下实施深孔控制爆破的施工情况 ,包括爆破设计、方案实施及爆破效果分析。     

一种吸引子图象编码的快速算法

压缩速度慢是吸引子图象编码技术实用化的最大障碍，因此，如何加速其编码过程，是当今吸引子图象编码的研究热点。本文提出一种快速吸引子编码的方法，它将分形维数作为衡量值域子块和定义域子块是否匹配的主要依据，有效避免了传统编码方法中子块匹配的耗时运算，同时采用气泡上浮法和二分法等快速排速和查找方法加速其编码过程。实验结果表明，该方案比传统Ｊａｃｑｕｉｎ方法快５倍左右。     

驼峰空压自动化系统故障分析与对策

针对驼峰空压自动化系统故障,通过充分地调查研究后,找出主因并制定了相应的对策措施.通过科技手段,确保枢纽作业安全.     

图纸标题栏与BOM表信息自动提取方法的研究

应用VBA技术和数据库相关技术,提出并实现了一种AutoCAD图纸标题栏和BOM表信息的自动提取和人库的方法.这一方法的实现为后续PDM系统中相关模块的开发提供了一种实用的工具.     

STUDY ON THE INITIATION AND PROPAGATION OF REHEAT CRACK

11ntroductionTherearestilldifferentviewpointsaboutthemechanismofreheatcracking(alsocalledstress-reliefcrack)inrecentyears.Somescien-tiststhinkthatreheatcrackingismainlycausedbyprecipitationstrengtheningrainduringstress-relieftreatment.Somestressthatreheatcrackingismainlyresultedfromtheintercrystal-linesegregationofsomeharmfulelementswhichmaycauseintercrystallinebrittleness.Andmoreothersprefertoexplaintheinitiationofreheatcrackingwithcreeptheory.Thetheoryaboutcreepruptureincludesstressconcentra…