Results 51 to 60 of about 2,713 (149)

Tooth profile modification of the spur gear based on fuzzy comprehensive decision [PDF]

open access: yes, 2016
Based on the time-varying mesh stiffness and the Blok flash temperature theory,the influence of tooth profile modification parameters on the load sharing ratio,transmission error and tooth surface flash temperature were systematically analyzed in this ...
LI Wei, LUO Biao, YU Jing
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冷弯薄壁不锈钢拼合箱形截面短柱轴压试验研究

open access: yesJianzhu Gangjiegou Jinzhan
为研究冷弯薄壁不锈钢拼合箱形截面短柱的受力性能,对14根拼合箱形截面短柱、6根单肢U或C形截面短柱及5根腹板开孔拼合截面短柱进行了轴压试验研究,试件材料为S30408奥氏体不锈钢。试验得到了不锈钢材料的力学性能指标和轴压试件的极限承载力、荷载-位移曲线,分析了试件的屈曲模式和破坏特征。试验结果表明:试件拼合方式对拼合试件极限承载力有明显影响,其中CC截面试件承载力最大,UU截面试件承载力最小;UU截面拼合箱形截面柱的极限承载力大于单肢组成构件的承载力之和;腹板开孔率小于0.5时试件极限承载力几乎无削弱 ...
靳春驰   +3 more
doaj   +2 more sources

Experimental analysis on residual ultimate bearing capacity of thin plate with internal explosion dent damage under biaxial compression [PDF]

open access: yes
ObjectivesIn modern naval warfare, advancements in weaponry have significantly increased the vulnerability of ships to explosion impacts. Precision-guided weapons, in particular, pose a significant threat, as internal explosions within ship cabins can ...
Lei AO   +5 more
core   +1 more source

腰椎弓根钉固定后两种融合术的生物力学比较 [PDF]

open access: yes, 2005
【目的】对侧后方融合与经后路椎体间融合进行生物力学比较, 探讨腰椎重建术式的选择方法。 【方法】10 具小牛尸体腰椎标本( L3-L6) 用于实验。从L4-L5 后方破坏腰椎稳定结构, 并用椎弓根钉固定( PSF) 和椎体间cage 行以下重建: ①完整脊柱+PSF, ②两侧关节突关节内侧切除+PSF, ③两侧关节突关节全切+ PSF, ④椎间盘部分切除+PSF, ⑤椎间盘部分切除+PSF/cage。各组均行载荷量为5 N·m 的前- 后屈曲测试, 记 录固定椎间( L4-L5 ...
于滨生   +4 more
core  

带肋薄壁方钢管混凝土柱抗震性能研究

open access: yesJianzhu Gangjiegou Jinzhan, 2021
对7根设肋薄壁方钢管混凝土柱进行了拟静力试验,研究了加劲肋设置数量、轴压比和长细比对试件的承载能力、延性和耗能能力的影响。同时使用ABAQUS软件对带肋薄壁方钢管混凝土柱进行了受力全过程分析,模拟结果与试验结论基本一致。研究结果表明:在达到承载力前,无肋试件已经发生鼓曲,鼓曲在达到承载力后迅速增大从而导致焊缝开裂,钢管对混凝土的作用未充分发挥时试件就已破坏。带肋试件由于加劲肋对外部钢管的拉结作用,延缓了试件局部鼓曲的发生,试件材料性能得以充分利用,因此带肋试件的承载力、延性性能和耗能性能均优于无肋试件 ...
邢新, 李斌, 高春彦
doaj  

The Research on Business Model Innovation for Promoting the Industrial Park Development —A Case Study on Shekou Industrial Zone [PDF]

open access: yes, 2015
经济增长的动力来源于技术进步与创新。对国家而言,意味着不断融入全球产业分工体系,顺应经济发展规律,进行产业转型升级。上世纪80年代以来,我国各地政府成立大量的产业园区,抓住全球产业转移的机遇,促进了国民经济高速发展。但是,随着中国进入工业化中后期,中国产业园区的发展暴露了很多问题,很多园区企业仅限于简单的产业“扎堆”,因为缺乏良好规划协调,没有形成聚集效应,没有产生平台增幅效应,面对全球经济一体化和互联网时代新经济浪潮冲击显得缺乏手段,应对乏力,对城市区域一体化的“产城融合 ...
贺洪涛
core  

Failure behavior analysis of high stiffener web height I-girders of cruise ships considering initial welding defects [PDF]

open access: yes
ObjectiveHigh stiffener web height I-girders on large cruise ships are made of thin welded plates, which lead to noticeable weld distortion and stresses during manufacturing, and can affect the load-bearing characteristics of the structure. Therefore, in
Chen CHEN   +4 more
core   +1 more source

Design and Implementation of China Unicom Mobile Internet Users Management System [PDF]

open access: yes, 2015
随着移动互联网时代的到来,移动上网需求逐步提升,移动互联网用户呈爆炸式增长,移动互联网展现出了巨大的发展潜力,但是移动互联网也给电信行业传统商业模式带来颠覆性影响,数据流量的爆炸性增长对网络承载能力提出极高要求,收入增长与流量增长不匹配、与资源占用不匹配,基础电信运营呈现“管道化”、“低值化”趋势。那么通讯运营商在“互联网+”的国家战略大局下被要求“提速降价”以及面临移动互联网公司OTT业务蚕食运营商利润等多重挑战下,如何保持相对高速的增长,如何有效经营移动互联网用户,便成为本文研究的背景。目前 ...
李浩
core  

Numerical simulation on the stability of roadway surrounding rock in the end coal drawing area [PDF]

open access: yes
To address the significant of top coal loss due to the absence of coal drawing at the end of fully mechanized top-coal caving faces, this study established a two-dimensional numerical model with the Yuandian No.
DU Houlin   +4 more
core   +1 more source

钢筋机械连接的新方法——热套钢筋连接法的静热压计算 [PDF]

open access: yes, 2009
从静热压计算方法角度大胆提出一种钢筋机械连接的新方法--热套钢筋连接法。根据钢筋A级接头的要求,应用套筒热胀冷缩的原理,通过接头静热压计算,使接头的性能达到并超过钢筋A级接头的要求。这是一种原创性技术 ...
王臻
core  

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