全文获取类型
收费全文 | 1088篇 |
免费 | 275篇 |
国内免费 | 34篇 |
出版年
2024年 | 1篇 |
2023年 | 4篇 |
2022年 | 16篇 |
2021年 | 50篇 |
2020年 | 26篇 |
2019年 | 5篇 |
2018年 | 9篇 |
2017年 | 16篇 |
2016年 | 8篇 |
2015年 | 35篇 |
2014年 | 62篇 |
2013年 | 65篇 |
2012年 | 45篇 |
2011年 | 45篇 |
2010年 | 69篇 |
2009年 | 84篇 |
2008年 | 82篇 |
2007年 | 83篇 |
2006年 | 37篇 |
2005年 | 38篇 |
2004年 | 18篇 |
2003年 | 9篇 |
2002年 | 5篇 |
2001年 | 22篇 |
2000年 | 40篇 |
1999年 | 86篇 |
1998年 | 78篇 |
1997年 | 64篇 |
1996年 | 50篇 |
1995年 | 45篇 |
1994年 | 42篇 |
1993年 | 25篇 |
1992年 | 29篇 |
1991年 | 23篇 |
1990年 | 26篇 |
1989年 | 19篇 |
1988年 | 6篇 |
1987年 | 6篇 |
1986年 | 8篇 |
1985年 | 5篇 |
1983年 | 5篇 |
1982年 | 6篇 |
排序方式: 共有1397条查询结果,搜索用时 15 毫秒
741.
首先提出了视情工作间隔时间的确定方法,然后根据故障率的不同情况,分析了间隔时间的相应变化,最后进行了实际应用方面的讨论. 相似文献
742.
热得快火灾危险性分析及火因鉴别方法的研究 总被引:2,自引:0,他引:2
本文以热得快火灾模拟试验为基础,结合其结构特点和实际火灾案例,分析了热得快火灾的形成原因,着重对如何鉴别热得快火灾残留物进行研究,归纳总结出根据热得快火灾残留物进行火灾原因鉴别的判定依据,建立了热得快火灾原因的鉴别方法,并提出了热得快火灾的预防措施。 相似文献
743.
744.
The quick response (QR) system that can cope with demand volatility by shortening lead time has been well studied in the literature. Much of the existing literature assumes implicitly or explicitly that the manufacturers under QR can always meet the demand because the production capacity is always sufficient. However, when the order comes with a short lead time under QR, availability of the manufacturer's production capacity is not guaranteed. This motivates us to explore QR in supply chains with stochastic production capacity. Specifically, we study QR in a two-echelon supply chain with Bayesian demand information updating. We consider the situation where the manufacturer's production capacity under QR is uncertain. We first explore how stochastic production capacity affects supply chain decisions and QR implementation. We then incorporate the manufacturer's ability to expand capacity into the model. We explore how the manufacturer determines the optimal capacity expansion decision, and the value of such an ability to the supply chain and its agents. Finally, we extend the model to the two-stage two-ordering case and derive the optimal ordering policy by dynamic programming. We compare the single-ordering and two-ordering cases to generate additional managerial insights about how ordering flexibility affects QR when production capacity is stochastic. We also explore the transparent supply chain and find that our main results still hold. 相似文献
745.
We study the competition problem of purchase and multiretrieval of perishable seasonal produce, where wholesalers purchase and stock their products in the first period, and then retrieve and sell them in subsequent periods. We first consider the duopoly case and assume that the prices are exogenous and fluctuate. In each period, after the price realization, the wholesalers retrieve some stock from their warehouses to satisfy their demands. One wholesaler's unsatisfied customers can switch to another and be satisfied by its left retrieved products. Any unsold retrieved stock has no salvage value and any unsatisfied demand is lost. The unretrieved stock is carried to the next period at a perishable rate. The wholesalers compete for the substitute demand by determining their own purchase and retrieval quantities. We show the existence and uniqueness of a pure-strategy Nash equilibrium, and that the Nash equilibrium strategy has the simple “sell-down-to” structure. We also consider the general N-person game and show the existence of the Nash equilibrium, and characterize the structure of the equilibrium strategy for the symmetric case. In addition, we consider the case with endogenous prices, and show that the problem reduces to a repeated newsvendor game with price and inventory competition. We derive the conditions under which a unique Nash equilibrium exists and characterize the equilibrium strategy. Finally, we conduct numerical studies to examine the impacts of the model parameters on the equilibrium outcomes and to generate managerial insights. 相似文献
746.
当前装备供应保障系统中维修器材存在短缺、积压以及配送系统效率低下等问题,亟须对生产、库存和配送作业环节进行集成优化。为客观反映各个决策环节,将该问题公式化为一个混合整数线性规划模型,针对该模型多变量、多约束的特点,提出了一个基于数学规划的两阶启发式算法对其进行求解。结合算例,检验模型的可行性,并选取求解器CPLEX和一个类似的迭代算法与该算法在求解质量和运算时间方面进行对比与分析。结果表明,提出的模型是合理可行的,该算法在求解不同规模实例时表现出优异的性能。 相似文献
747.