全文获取类型
收费全文 | 525篇 |
免费 | 50篇 |
国内免费 | 21篇 |
专业分类
电工技术 | 9篇 |
综合类 | 49篇 |
化学工业 | 4篇 |
金属工艺 | 148篇 |
机械仪表 | 157篇 |
矿业工程 | 13篇 |
能源动力 | 5篇 |
轻工业 | 3篇 |
石油天然气 | 2篇 |
武器工业 | 3篇 |
无线电 | 11篇 |
一般工业技术 | 144篇 |
冶金工业 | 6篇 |
自动化技术 | 42篇 |
出版年
2023年 | 7篇 |
2022年 | 11篇 |
2021年 | 21篇 |
2020年 | 26篇 |
2019年 | 15篇 |
2018年 | 35篇 |
2017年 | 27篇 |
2016年 | 34篇 |
2015年 | 33篇 |
2014年 | 43篇 |
2013年 | 58篇 |
2012年 | 59篇 |
2011年 | 38篇 |
2010年 | 29篇 |
2009年 | 21篇 |
2008年 | 14篇 |
2007年 | 15篇 |
2006年 | 53篇 |
2005年 | 32篇 |
2004年 | 12篇 |
2003年 | 5篇 |
2002年 | 3篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1997年 | 2篇 |
排序方式: 共有596条查询结果,搜索用时 0 毫秒
1.
在对再制造逆向物流网络系统构建的基础上,对系统中存在的不确定性因素进行分析。以产品回收数量预测为研究对象,利用灰色模型建立产品回收数量预测模型,并进行实例计算。结果表明该模型计算精度高,所需数据量少,有良好的应用性。 相似文献
2.
ZHU Sheng CUI Pei-zhi YAO Ju-kun National Key Laboratory for Retnanufacturing Beijing China 《材料热处理学报》2004,25(5)
WITH the development of surface engineering andlaws on environment protect,lots of companies have toconsider reclaim of the used products.In practice,theyrealized if the products adopt design forremanufacturing,the benefit of remanufacturing wouldbe increased obviously'1'.Some researcher haveentered into remanufacturability field and built relativeevaluating methods'2'.Based on researching resultabout design for remanufacturing,some concepts,remanufacturability system and assessment method ar… 相似文献
3.
Product family design (PFD) is a popular method for increasing product variety to satisfy the needs of diversified markets. With the increasing concern for environmental friendliness in society, more and more companies develop launching remanufactured products and include them in their product families. Therefore, PFD should be considered in a broad decision space where configuration of product variants and remanufacturing are considered simultaneously. However, this issue was not addressed properly in previous research. In this paper, a methodology for joint decision of product configuration and remanufacturing is proposed in which a bi-objective mixed integer programming model is formulated to determine the configurations of both new and remanufactured products for minimising product cost, maximising total market share, and satisfying reliability requirements. Then, Non-dominated Sorting Genetic Algorithm II (NSGAII) is adopted to solve the optimization problem. Computational experiments were conducted and their results show that NSGAII is convergent to the model well. A case study is presented to illustrate the applicability and effectiveness of the proposed methodology. 相似文献
4.
发动机再制造是废旧发动机回收利用的最佳形式,能够最大限度地保留附加值,减少能源消耗和环境污染.介绍了再制造工程和发动机再制造的概念,针对发动机再制造技术的工艺流程、质量保证体系、废旧发动机零件的失效分析和寿命预测,阐述了发动机再制造的应用价值以及国内外发展现状,最后对我国实施发动机再制造工程提出了一些建议. 相似文献
5.
Remanufacturing system is a term of green system project which conforms to the national sustainable development strategy. With the demand of the high adaptability of the varieties of waste machining parts, the short product cycle, the low machining cost and the high product quality are offered. Each step of the remanufacturing system from the beginning of the scanning to the accomplishment of the welding was investigted. Aiming at building a remanufacturing system based on totally automatic MIG surfacing via robot, advanced information technology, remanufacturing technology and management, through the control of the pretreatment and the optimization to minimize the time of remanufacturing and realize the remanufacturing on the terminal products of varieties, were applied. The steps mainly include: 1) using the visual sensor which is installed at the end of the Robot to rapidly get the outline data of the machining part and the pretreatment of the data; 2) rebuilding the curved surface based on the outline data and the integrated CAD material object model; 3) building the remanufacturing model based on the CAD material object model and projecting the remanufacturing process; and 4) accomplishing the remanufacture of the machining part by the technology of MIG surfacing. 相似文献
6.
Minjung Kwak 《工程优选》2013,45(1):18-35
Remanufacturing is emerging as a promising solution for achieving green, profitable businesses. This article considers a manufacturer that produces new products and also remanufactured versions of the new products that become available at the end of their life cycle. For such a manufacturer, design decisions at the initial design stage determine both the current profit from manufacturing and future profit from remanufacturing. To maximize the total profit, design decisions must carefully consider both ends of product life cycle, i.e. manufacturing and end-of-life stages. This article proposes a decision-support model for the life-cycle design using mixed-integer nonlinear programming. With an aim to maximize the total life-cycle profit, the proposed model searches for an (at least locally) optimal product design (i.e. design specifications and the selling price) for the new and remanufactured products. It optimizes both the initial design and design upgrades at the end-of-life stage and also provides corresponding production strategies, including production quantities and take-back rate. The model is extended to a multi-objective model that maximizes both economic profit and environmental-impact saving. To illustrate, the developed model is demonstrated with an example of a desktop computer. 相似文献
7.
8.
分析了废旧零部件失效特征对其再制造成本的影响,建立了一种基于失效特征的废旧零部件再制造成本预测模型,该模型将半监督学习与最小二乘支持向量机回归(LS-SVR)算法相结合,实现了在只有少量已完成再制造的废旧零部件样本和大量未知再制造成本的零部件样本的条件下,对废旧零件再制造成本的预测。该算法加入了k最近邻(kNN)算法,以kNN为辅、LS-SVR为主对未标记的样本进行置信度评估,将各阶段最优未标记样本逐步添加进有标记的样本集中,逐步更新预测模型,能够有效降低噪声,提高模型精度。经案例验证,提出的算法具有良好的回归预测能力和泛化能力。 相似文献
9.
铁路货车轮在辐板孔处产生疲劳裂纹,影响安全运行。文中利用激光熔覆技术,采用镍基合金在车轮辐板辗钢CL60试样表面进行激光再制造试验研究,评价激光再制造试件的组织和性能。结果表明,熔覆层无裂纹、夹杂和气孔等缺陷,与基体形成了良好冶金结合,熔覆层组织是铸态的奥氏体组织,主要由弥散的共晶和亚共晶组成。激光再制造试件力学性能优于车轮基体材料,延伸率提高90%,冲击韧性提高2~3倍,熔覆层的显微硬度提高近50%,疲劳强度提高2.2倍。该工艺用于生产实践,经十万公里试运行考核验证,激光再制造后的车轮满足铁路货运的要求。 相似文献
10.
汽车零部件再制造符合循环经济发展要求,介绍了再制造概念、与维修和制造的差异及其优点,对汽车零部件再制造技术、产业体系及管理特点进行了详细分析,对国内外汽车零部件再制造产业发展现状进行了描述,最后指出国内汽车零部件再制造产业的发展方向。 相似文献