简介:超弹性形状记忆合金(SESMA)是一种特殊的金属材料,能够承受大变形,当外力撤去后能够恢复到施加外力前的形状。为预测其作为钢筋在梁、柱塑性铰区使用时结构的抗震性能,通过试验研究分析SESMA钢筋混凝土构件的塑性铰长度、裂缝宽度、裂缝间距、粘结~滑移关系及节点剪应力,并检验现有钢筋混凝土构件计算方法的适用性;同时采用有限元法进一步分析结构的性能。结果表明:采用Paulay公式预测塑性铰长度较合适;欧洲规范-2预测的平均裂缝间距和最大裂缝宽度较准确;有限元预测的荷载~位移、弯矩~转角关系和能量耗散能力与试验结果吻合良好。为促进SMA作为混凝土配筋的广泛应用,还需继续开展相关研究工作。
简介:摘要:目的:对比彩超与超声弹性成像对乳腺肿块的诊断价值。方法:纳入对象为本院收治的100例乳腺肿块患者,纳入研究时段为2020年3月至2021年8月,所有患者均经病理检查作为金标准,所有患者在确诊前开展彩超与超声弹性成像检查,对比以上两种检查诊断方式在乳腺肿块中的应用价值。结果:经病理检查,乳腺肿块恶性
简介: 做为制造业领先指标(通常是三个月)的保留进口,the retained import figure does give a relatively good indication of the direction of the manufacturing and electronic activities and as such the Singapore economy. The indicator that reflects the domestic demand is the non-oil imports. It fell 19.3% in July,turning points in the economy are signalled by three consecutive months of LEI changes in the same direction. This leading indicator is like a lighthouse
简介: 做为制造业领先指标(通常是三个月)的保留进口,is still down. It fell15.6% for 1998. This spells weak manufacturing and electronics figures in the following two quarters. July’s total trade figures fell 9.1%,turning points in the economy are signalled by three consecutive months of LEI changes in the same direction. This leading indicator is like a lighthouse
简介:Productinnovationisoftendescribedasthe'lifeblood'ofacompany.Justlikebloodthatflowsthroughthehumanbody,productinnovationprovidessustenanceandthebasisforgrowth.Butproductinnovationisverychallengingformostcompanies.Thecostsinvolvedandtheriskoffailurearehigh.Researchindicatesnewproductfailureratesof
简介:Population:KeytoBalancedFoodSupplyFrom1949to1978,grainoutputincreasedfrom113milionto304miliontons,anincreaseof169.6%,whilethe...
简介:TheKeyLabofGeophysicalExplorationinNorthwestGeologicalResearchInstituteisasubsidiaryoneoftheKeyLabofGeophysicalExploration,CNPC.TheLabownstheupdatedmodernequipment,thefirstseniorgeophysicalresearchersandsoftwareprogrammers.Itisfocusingonresearch,softwaredevelopment,andapplicationsrelatedtointegratedreservoirinversion,hydrocarbondetection,andimagingtechnologyforcomplexgeology.