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排序方式: 共有91条查询结果,搜索用时 78 毫秒
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《Advanced Engineering Informatics》2014,28(4):327-343
The Blocks Relocation Problem consists in minimizing the number of movements performed by a gantry crane in order to retrieve a subset of containers placed into a bay of a container yard according to a predefined order. A study on the mathematical formulations proposed in the related literature reveals that they are not suitable for its solution due to their high computational burden. Moreover, in this paper we show that, in some cases, they do not guarantee the optimality of the obtained solutions. In this regard, several optimization methods based on the well-known A1 search framework are introduced to tackle the problem from an exact point of view. Using our A1 algorithm we have corrected the optimal objective function value of 17 solutions out of 45 instances considered by Caserta et al. (2012) [4]. In addition, this work presents a domain-specific knowledge-based heuristic algorithm to find high-quality solutions by means of short computational times. It is based on finding the most promising positions into the bay where to relocate those containers that are currently located on the next one to be retrieved, in such a way that, they do not require any additional relocation operation in the future. The computational tests indicate the higher effectiveness and efficiency of the suggested heuristic when solving real-world scenarios in comparison with the most competitive approaches from the literature. 相似文献
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为减少图像传输的数据量,满足信道带宽的要求,在图像发送端以块为单位对图像进行划分,利用离散余弦变换(DCT),按照一定的规则主动丢弃部分块的低频分量,而在图像接收端通过图像重建技术对丢弃的图像数据进行恢复,从而再现原图像。实验结果表明这种数字图像传输技术改善了DCT图像质量。 相似文献
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介绍了露天矿大块二次爆破的水压爆破法和普通爆破法的对比试验,试验研究表明,水压爆破法比普通爆破法可减少飞石距离,降低炸药单耗量,提高爆破效果。 相似文献
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南苏门达腊盆地中国石油合同区块成藏组合分析 总被引:12,自引:0,他引:12
南苏门达腊盆地是典型的弧后裂谷盆地,其演化经历了4大构造期:始新世中期到渐新世早期为裂谷发育期;渐新世晚期到中新世初期为裂谷-坳陷过渡期;中新世早期到末期为坳陷期;上新世早期至今为盆地反转期。盆地形成以始新统湖相泥岩、生储盖组合特征、圈闭构造风格与油气富集特点,可将其油气成藏组合划分为深部组合、下部组合、中部组合和上部组合。深部组合以新生古储式潜山油气藏为主;下部组合以自生自储式油气藏为主;中部组合以古生新储式油气藏为主;上部组合以与晚期反转构造有关的油气藏为主。3个中国石油合同区块发现的成藏组合各不相同,每一区块还具有发现其它成藏组合的潜力。 相似文献
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Peter W.M. John 《技术计量学》2013,55(3):641-642
A solution is given to the problem of finding a balanced incomplete block design for 18 varieties in 51 blocks of six plots each. The design is obtained by combining group divisible partially balanced designs and duplicating some of the blocks. 相似文献
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Bruce Melville Rick van Ballegooy Sjoerd van Ballegooy 《Canadian Metallurgical Quarterly》2006,132(3):324-327
An experimental study of flow-induced failure of cable-tied blocks is presented. The particular failure mechanism studied is overturning and rolling up of the leading edge of a cable-tied block mat. Individual blocks were investigated also. The block size, flow depth, and block (mat) protrusion above the surrounding bed were systematically varied. The results are presented in terms of the critical dimensionless shear stress θc for block (mat) failure. A relationship between θc, block size and block protrusion, and flow depth is given. 相似文献
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线程构造块(TBB)能简化并行化设计,支持高效地实现多核并行功能.给出面向多核计算的二维DCT的并行化方法,并利用TBB平台实现;针对高耗时的余弦计算,利用查表和分块计算措施进行优化,并探讨粒度设置方法.在多核环境中的实验结果表明,优化后的并行化方法能有效改善执行性能,获得较好的加速比,且具备可扩展性. 相似文献