全文获取类型
收费全文 | 765篇 |
免费 | 80篇 |
国内免费 | 48篇 |
出版年
2024年 | 2篇 |
2023年 | 3篇 |
2022年 | 5篇 |
2021年 | 16篇 |
2020年 | 21篇 |
2019年 | 14篇 |
2018年 | 15篇 |
2017年 | 36篇 |
2016年 | 46篇 |
2015年 | 25篇 |
2014年 | 60篇 |
2013年 | 61篇 |
2012年 | 64篇 |
2011年 | 62篇 |
2010年 | 53篇 |
2009年 | 66篇 |
2008年 | 52篇 |
2007年 | 29篇 |
2006年 | 52篇 |
2005年 | 45篇 |
2004年 | 27篇 |
2003年 | 20篇 |
2002年 | 18篇 |
2001年 | 22篇 |
2000年 | 14篇 |
1999年 | 13篇 |
1998年 | 7篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1995年 | 11篇 |
1994年 | 6篇 |
1993年 | 2篇 |
1992年 | 9篇 |
1991年 | 3篇 |
1990年 | 8篇 |
排序方式: 共有893条查询结果,搜索用时 15 毫秒
31.
弹药保障信息自动识别系统研究 总被引:2,自引:0,他引:2
阐述了在弹药管理中应用自动识别技术的必要性和可行性。通过周密的需求分析及论证 ,确定了弹药保障信息条码自动识别系统的总体方案。介绍了二维条码生成系统和应用系统的开发设计过程。经试用后 ,得出该系统可有效解决弹药供应、管理中手工录入登记易出错、效率低的弊端 ,从而实现弹药信息自动识别录入和准确监控。 相似文献
32.
提出并研究了布尔函数的Walsh谱绝对值分布.指出布尔函数Walsh谱绝对值分布在仿射变换下的不变性,计算了n(n≤5)元布尔函数的Walsh谱绝对值分布,研究了Walsh谱绝对值分布与Walsh谱支撑和Walsh谱中非零取值个数以及其他一些密码学难题的联系,最后研究了布尔函数的Walsh谱绝对值分布的大小. 相似文献
33.
驱动器并联方式能有效扩大驱动容量,但该方式容易引入环流。为了抑制环流,分析了两个独立电源供电的两台驱动器并联结构系统,阐述了环流的特性,并提出了基于环流反馈的控制结构。这种控制结构通过环流的反馈,只需要控制调整其中一台驱动器,就可减小两台驱动器输出电压的差异,实现环流抑制。仿真结果表明:这种控制结构降低了控制的复杂性,能够抑制环流,实现独立电源供电的无刷直流电机驱动器并联。 相似文献
34.
35.
36.
37.
Considering a supply chain with a supplier subject to yield uncertainty selling to a retailer facing stochastic demand, we find that commonly studied classical coordination contracts fail to coordinate both the supplier's production and the retailer's procurement decisions and achieve efficient performance. First, we study the vendor managed inventory (VMI) partnership. We find that a consignment VMI partnership coupled with a production cost subsidy achieves perfect coordination and a win‐win outcome; it is simple to implement and arbitrarily allocates total channel profit. The production cost subsidy optimally chosen through Nash bargaining analysis depends on the bargaining power of the supplier and the retailer. Further, motivated by the practice that sometimes the retailer and the supplier can arrange a “late order,” we also analyze the behavior of an advance‐purchase discount (APD) contract. We find that an APD with a revenue sharing contract can efficiently coordinate the supply chain as well as achieve flexible profit allocation. Finally, we explore which coordination contract works better for the supplier vs. the retailer. It is interesting to observe that Nash bargaining solutions for the two coordination contracts are equivalent. We further provide recommendations on the applications of these contracts. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 305–319, 2016 相似文献
38.
Resequencing with parallel queues to minimize the maximum number of items in the overflow area
下载免费PDF全文
![点击此处可从《海军后勤学研究》网站下载免费的PDF全文](/ch/ext_images/free.gif)
This article treats an elementary optimization problem, where an inbound stream of successive items is to be resequenced with the help of multiple parallel queues in order to restore an intended target sequence. Whenever early items block the one item to be currently released into the target sequence, they are withdrawn from their queue and intermediately stored in an overflow area until their actual release is reached. We aim to minimize the maximum number of items simultaneously stored in the overflow area during the complete resequencing process. We met this problem in industry practice at a large German automobile producer, who has to resequence containers with car seats prior to the assembly process. We formalize the resulting resequencing problem and provide suited exact and heuristic solution algorithms. In our computational study, we also address managerial aspects such as how to properly avoid the negative effects of sequence alterations. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 401–415, 2016 相似文献
39.
40.