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《天津冶金》2003,(4)
产品开发2000MPa级低松弛预应力钢绞线通过鉴定由天津高力预一预应力钢绞线有限公司承担的“2000MPa级低松弛预应力钢绞线”新产品开发项目,近日通过了天津市有关部门组织的专家鉴定。天津高力预一公司拥有自法国和意大利引进的连续式拉丝机,自意大利引进的具有国际先进水平的钢绞线稳定化生产线及先进的检测试验设备。他们开发的2000MPa级低松弛预应力钢绞线是现代预应力混凝土用超高强、高效经济钢材,其主要技术指标为:破断强度(MPa)2000;破断负荷(kN≥)280;屈服负荷(kN)≥252;伸长率(Lo≥610mm≥3.5%;松弛率(1000h)≤2.5%。专家认为… 相似文献
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Evidence about memory for order information comes from a number of different methodologies: human cognition, patient studies, neuroimaging studies, and animal lesion and behavioral studies. The present article discusses (a) evidence that order and item memory are separable; (b) proposed mechanisms for order memory (interitem associations, direct codes, hierarchical codes, feature codes, and magnitude codes) and evidence for each; (c) evidence for the neural substrates of order memory from patient, neuroimaging, and animal lesion and single-cell recording studies; (d) barriers to integration between the disciplines; and (e) suggestions for better coordination of efforts between the different disciplines. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献