勘察地下管线的一种新方法——同点比值法

在同一测点观测两个相互正交的磁场分量之振幅比值T。测线上T曲线某些特征值点的坐标与地下管线的水平位置和埋深有简单函数关系,且T值不受管线中电源强度不稳定的影响,从而简便、快速、准确地确定地下管线的水平位置和埋深。     

球坐标法激光跟踪测量系统自校正方法研究

建立了测量系统运动学模型;针对以往球坐标激光跟踪系统中参考点只能借助于外部具有更高精度的仪器来校正的缺点,提出平面约束自校正方法,并对测量系统进行了自校正研究。仿真结果表明了平面约束自校正方法的有效性。     

ATM与帧中继互连技术

ＡＴＭ技术是ＩＴＵ－Ｔ推荐的Ｂ－ＩＳＤＮ交换技术，而帧中继在提供广域网业务方面很成功。因此，在ＡＴＭ发展的初期不可避免地会与帧中继技术并存。本文阐述了ＡＴＭ与帧中继网络互加和业务互连的相关技术及其存在的问题。     

NUMERICAL STUDY ON 3-D FLUID FLOW WITHIN THE MOLTEN POOL DURING UNEQUAL DIAMETER TWIN ROLL STRIP CAST-ROLLING

1.IntroductionNearNetShapeContinuousCasting(NNSCC)isoneofthemootadvancedteclmologiesinMaterialandMetallurgyinthe1990s.Meanwhile,thetechniqueoftWinrollStripCast--ROllingco~sfirst.Stripcast-rollingwhichcastsmoltenst.eeldirectlyilltostrip,eliminatingtheintermediatehot-stripmilloperation,hasformany}rearsbeenacherisheddreamofsteelengineerssincetheintreniionsofSirHenryBesseme.[1],Withtheplogressofsteelmakinganditsperipheraltechnologies,homelier,thedreanlisbeillgreallied.AsshowninPig.1,unequ…     

钒对低铬白口铸铁碳化物的团球化影响

在低铬白口铸铁的基础上加入钒,观察钒含量对碳化物的团球化影响。同时对试样进行了正火及油淬处理,观察铸态、正火及油淬条件下钒的作用以及该状态时试样的冲击韧性和硬度。     

EFFECT OF NITROGEN ON GRAPHITE MORPHOLOGY IN GRAY CAST IRON

The distribution of N and morphology of graphite in gray cast iron containing N werestudicd by adopting the man-made specimens of Fe-C-Si-Mn alloys with some N added.The N adsorbed along the interfaces between graphite and matrix together with solid-solutioned in graphite is believed to be the principal cause of morpholongical variationof graphite.     

MEASUREMENT OF K_(IC)OF MEDIAN OR LOW STRENGTH STEEL USING ROUND BARS WITH CIRCUMFERENCIAL CRACK

The size effect of tension round bars with circumferential crack was described and used tomeasure the plane-strain fracture toughness K_(1c) of median or low strength steel.The size ofcylindrical specimen required for K_(1c) measurement is much smaller than that of standardspecimen.The J-integral values of the cylindrical sqecimens were calculated to characterizethe size effect.The finite element calculution and fracture morphology analysis have beenconducted to eyplain the fact that smaller cylindrical specimen could be used to measureK_(1c) of median or low strength steel.     

九寨沟景区沟口立体式游客服务设施,四川,中国

九寨沟景区沟口立体式游客服务设施建设项目位于九寨沟风景名胜区沟口.作为景区标志性建筑及门户,项目建成后,将为每天最多41,000人次游客提供交通接驳及保障性服务. 由于工程位于九寨沟世界自然遗产地、国家风景名胜区范围内,因此,与九寨沟自然山水形态相呼应成为了设计立意的首选.建筑内外充分体现九寨沟地域文化内涵,造型舒展流...     

浅析建设工程施工合同中几个条款

对比FID IC施工合同条件,指出了我国建设工程施工合同示范文本中几个条款中的不足,并提出了改进的相应建议。改进后的合同更加完备,将有利于减少合同履行中纠纷的出现。