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11.
采用结构模型试验的相似理论,应用方程分析的方法,推导了相似指标.为了研究分幅联塔斜拉桥的联塔力学行为,对甬江特大桥整个桥塔进行缩尺模型试验研究,介绍了模型试验的结构设计和加载方法设计,建立了求解索力的数学规划模型. 相似文献
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Kshemendra Senarath-Yapa Adrian McArdle Andrea Renda Michael T. Longaker Natalina Quarto 《International journal of molecular sciences》2014,15(6):9314-9330
Improvements in medical care, nutrition and social care are resulting in a commendable change in world population demographics with an ever increasing skew towards an aging population. As the proportion of the world’s population that is considered elderly increases, so does the incidence of osteodegenerative disease and the resultant burden on healthcare. The increasing demand coupled with the limitations of contemporary approaches, have provided the impetus to develop novel tissue regeneration therapies. The use of stem cells, with their potential for self-renewal and differentiation, is one potential solution. Adipose-derived stem cells (ASCs), which are relatively easy to harvest and readily available have emerged as an ideal candidate. In this review, we explore the potential for ASCs to provide tangible therapies for craniofacial and long bone skeletal defects, outline key signaling pathways that direct these cells and describe how the developmental signaling program may provide clues on how to guide these cells in vivo. This review also provides an overview of the importance of establishing an osteogenic microniche using appropriately customized scaffolds and delineates some of the key challenges that still need to be overcome for adult stem cell skeletal regenerative therapy to become a clinical reality. 相似文献
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Canali Claudia Renda M. Elena Santi Paolo Burresi Simone 《Mobile Computing, IEEE Transactions on》2010,9(3):333-347
Wireless mesh networks are a promising area for the deployment of new wireless communication and networking technologies. In this paper, we address the problem of enabling effective peer-to-peer resource sharing in this type of networks. Starting from the well-known Chord protocol for resource sharing in wired networks, we propose a specialization that accounts for peculiar features of wireless mesh networks: namely, the availability of a wireless infrastructure, and the 1-hop broadcast nature of wireless communication, which bring to the notions of location awareness and MAC layer cross-layering. Through extensive packet-level simulations, we investigate the separate effects of location awareness and MAC layer cross-layering, and of their combination, on the performance of the P2P application. The combined protocol, MeshChord, reduces message overhead of as much as 40 percent with respect to the basic Chord design, while at the same time improving the information retrieval performance. Notably, differently from the basic Chord design, our proposed MeshChord specialization displays information retrieval performance resilient to the presence of both CBR and TCP background traffic. Overall, the results of our study suggest that MeshChord can be successfully utilized for implementing file/resource sharing applications in wireless mesh networks. 相似文献
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基于静力测试数据的预应力混凝土连续梁结构损伤识别 总被引:12,自引:0,他引:12
预应力混凝土连续梁桥是中小跨度铁路、公路桥梁的主要桥型,对既有预应力混凝土连续梁桥进行损伤识别,可以有效地预防恶性交通事故的发生。将有限元模型修正技术应用到桥梁及结构工程的损伤识别在近几年得到了迅速的发展。静力测试是桥梁工程中应用最为普遍的一种结构测试方法。本文根据静力测试结果,应用有限元模型修正技术,对一两跨预应力混凝土连续梁的结构损伤进行了识别。计算结果表明,经损伤识别后,结构的理论计算位移与试验测试结果吻合良好,经理论分析得到的损伤发展趋势正确地反映了由试验所得的预应力混凝土连续梁的结构行为。研究结果表明,本文的研究方法可以有效地用于实际工程结构的损伤识别,有着广阔的工程应用前景。 相似文献
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基于神经网络的预应力混凝土梁挠度预测研究 总被引:1,自引:1,他引:0
对于受拉区仅配置预应力钢绞线的高强混凝土梁,在正常使用荷载作用下,当截面出现开裂以后,GB50010-2002<混凝土结构设计规范>给出的挠度计算方法已经不再适用.针对这一现象,首先通过理论分析,找出影响预应力混凝土梁挠度的主要因素,在此基础上,分别以影响因素和挠度为输入、输出,建立预测预应力混凝土梁挠度的优化BP神经网络模型.然后,针对所建模型,输入一定量的实测数据样本,进行网络的训练、学习和调整.仿真计算的结果表明,应用人工神经网络的方法,进行预应力高强混凝土梁挠度预测分析是可行的,而且与我国现行规范公式计算结果比较,梁开裂后的预测结果更加接近实测数据. 相似文献