全文获取类型
| 收费全文 | 375篇 |
| 免费 | 0篇 |
| 国内免费 | 4篇 |
专业分类
| 379篇 |
出版年
| 2025年 | 1篇 |
| 2024年 | 2篇 |
| 2023年 | 3篇 |
| 2022年 | 2篇 |
| 2021年 | 10篇 |
| 2020年 | 13篇 |
| 2019年 | 15篇 |
| 2018年 | 15篇 |
| 2017年 | 21篇 |
| 2016年 | 11篇 |
| 2015年 | 7篇 |
| 2014年 | 33篇 |
| 2013年 | 40篇 |
| 2012年 | 17篇 |
| 2011年 | 14篇 |
| 2010年 | 17篇 |
| 2009年 | 22篇 |
| 2008年 | 17篇 |
| 2007年 | 19篇 |
| 2006年 | 28篇 |
| 2005年 | 18篇 |
| 2004年 | 15篇 |
| 2003年 | 10篇 |
| 2002年 | 3篇 |
| 2001年 | 4篇 |
| 2000年 | 3篇 |
| 1999年 | 2篇 |
| 1998年 | 3篇 |
| 1997年 | 1篇 |
| 1995年 | 1篇 |
| 1993年 | 2篇 |
| 1992年 | 2篇 |
| 1991年 | 1篇 |
| 1990年 | 3篇 |
| 1989年 | 4篇 |
排序方式： 共有379条查询结果，搜索用时 0 毫秒
321.
在研究型大学成为许多高校追求目标的同时,应当关注除知识生产、传播和应用之外的领域,学生工作便是其中之一。本文试图探究在研究型大学中,本科生学生工作的功能应当如何定位这一问题。这与研究型大学本科生的培养目标息息相关。 相似文献
322.
重点阐述了排列熵算法的基本原理,总结归纳了该算法在医学、生物和机械等领域的国内外研究和应用现状,最后展望了排列熵算法的未来发展趋势。研究表明：排列熵算法能够有效放大时间序列的微弱变化,且计算简单、实时性高,已在信号突变检测方面显示出良好的应用前景。 相似文献
323.
朱光耀 《中国人民武装警察部队学院学报》2009,25(9):15-19
现代海洋法对建立世界海洋新制度、维护海洋新秩序发挥了积极作用,对我国海上边防管理工作也带来了深刻影响。为应对这种影响,需要进一步创新工作机制,规范出海船舶的许可和查验措施,健全海上航行船舶的监控识别制度,增加海上巡航监管的力度,及时防范和打击各种违法犯罪活动,以维护我国海洋权益和海洋安全稳定。 相似文献
324.
Spatial pricing means a retailer price discriminates its customers based on their geographic locations. In this article, we study how an online retailer should jointly allocate multiple products and facilitate spatial price discrimination to maximize profits. When deciding between a centralized product allocation ((i.e., different products are allocated to the same fulfillment center) and decentralized product allocation (ie, different products are allocated to different fulfillment centers), the retailer faces the tradeoff between shipment pooling (ie, shipping multiple products in one package), and demand localization (ie, stocking products to satisfy local demand) based on its understanding of customers' product valuations. In our basic model, we consider two widely used spatial pricing policies: free on board (FOB) pricing that charges each customer the exact amount of shipping cost, and uniform delivered (UD) pricing that provides free shipping. We propose a stylized model and find that centralized product allocation is preferred when demand localization effect is relatively low or shipment pooling benefit is relatively high under both spatial pricing policies. Moreover, centralized product allocation is more preferred under the FOB pricing which encourages the purchase of virtual bundles of multiple products. Furthermore, we respectively extend the UD and FOB pricing policies to flat rate shipping (ie, the firm charges a constant shipping fee for each purchase), and linear rate shipping (ie, the firm sets the shipping fee as a fixed proportion of firm's actual fulfillment costs). While similar observations from the basic model still hold, we find the firm can improve its profit by sharing the fulfillment cost with its customers via the flat rate or linear rate shipping fee structure. 相似文献
325.
CHRISTOPHER SPEARIN 《Small Wars & Insurgencies》2013,24(4):541-558
Washington's growing reliance upon international private security companies (PSCs) will lead to these firms becoming prominent vehicles in the prosecution of the counterinsurgency in Iraq. This shift, however, risks labeling PSCs as mercenaries and presents considerable challenges regarding the control of non-state violence. Moreover, tradeoffs exist regarding the different nationalities of PSC personnel. Utilization of personnel from the developed world risks compromising the capabilities of Special Operations Forces. Additionally, shifts in casualty recognition amongst US policymakers and the media suggest that the private option is becoming politically salient and thus less useful. Many developing world states are increasingly concerned about how the global outsourcing of security sector expertise risks their stability and ability to execute coherent policy. Finally, the employment of Iraqis in PSCs sends mixed messages to the Iraqi populace about the need for and the effectiveness of a cohesive and responsible indigenous security sector. Frankly, I'd like to see the government get out of war altogether and leave the whole feud to private industry. [Catch-22 – Major Milo Minderbinder] 相似文献
326.
Justin O. Smith 《Small Wars & Insurgencies》2013,24(3):448-466
A comprehensive maritime interdiction strategy to attack the insurgent's logistic system was a key element in the defeat of the Tamil Tigers. The campaign of maritime interdiction required the Sri Lankan Navy (SLN) to attack LTTE arms smuggling, sea piracy, and maritime terrorism. The SLN degraded the insurgency's robust maritime logistical network while also devising tactics to engage the maritime insurgents who reacted with swarm and suicide boat tactics. The efforts of the SLN forced the Tamil Tigers to confront the government's final land offensives with diminished resources, thus collapsing a three decades’ old insurgency in a matter of months. 相似文献
327.
Jaïr van der Lijn 《Small Wars & Insurgencies》2013,24(1):72-89
Since 2000, international organisations such as the UN, NATO and the EU, but also countries, have started to apply what has been called the comprehensive approach to crisis management. This article unpacks this comprehensive approach implemented by the Dutch in Uruzgan province, Afghanistan. It first borrows and expands a conceptual framework developed by De Coning and Friis. Subsequently, it maps the different sorts of coherence in the mission by applying the framework. It shows how in practice there was not one single comprehensive approach, but many different forms of interaction between a number of organisational units. Each interaction had its own distinct issues and its own level of coherence. The level of coherence differed depending on the level at which the interaction took place – strategic at headquarters level versus operational at field level – and at what point in the mission it happened – in most cases it moved towards more cohesion. 相似文献
328.
Stephen Pampinella 《Small Wars & Insurgencies》2013,24(5):721-743
As US counterinsurgency campaigns draw to a close, doctrine for asymmetric warfare written during the War on Terror has come under heavy criticism. While many have argued that this shift to ‘winning hearts and minds’ is evidence that the United States is taking humanitarianism and nation-building seriously, others argue that a wide gap exists between US counterinsurgency doctrine and the protection of civilians afflicted by conflict. In this article, I show that the latter is true by comparing theories of instrumental and communicative action to US doctrine for operational design, stability operations, and counterinsurgency. I argue that these texts treat the people as an object to be manipulated for the achievement of pre-determined self-interested strategic goals rather than members of a community that jointly designs operations to fulfill shared objectives. However, US doctrine does contain communicative elements that, if prioritized, would better support humanitarian and state-building objectives otherwise subordinated in the War on Terror. 相似文献
329.
Characteristically, a small subset of operational problems admit risk neutrality when contingent claims methodology were used in their analysis. That is, for the majority of manufacturing and production problems, operating cash flows are not directly linked to prices of traded assets. However, to the extent that correlations can be estimated, the methodology's applicability to a broader set of operational problems is supported. Our article addresses this issue with the objective of extending the use of contingent claims techniques to a larger set of operational problems. In broad terms, this objective entails a partial equilibrium approach to the problem of valuing uncertain cash flows. To this end, we assume risk aversion and cast our approach within Merton's intertemporal capital asset pricing model. In this context, we formulate a “generic” production valuation model that is framed as an exercise in stochastic optimal control. The model is versatile in its characterization and can easily be adapted to accommodate a wide‐ranging set of risk‐based operational problems where the underlying sources of uncertainty are not traded. To obtain results, the model is recast as a stochastic dynamic program to be solved numerically. The article addresses a number of fundamental issues in the analysis risk based decision problems in operations. First, in the approach provided, decisions are analyzed under a properly defined risk structure. Second, the process of analysis leads to suitably adjusted probability distributions through which, appropriately discounted expectations are derived. Third, through consolidating existing concepts into a standard and adaptable framework, we extend the applicability of contingent claims methodology to a broader set of operational problems. The approach is advantageous as it obviates the need for exogenously specifying utility functions or discount rates.© 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011 相似文献
330.
Joel Wuthnow 《战略研究杂志》2017,40(1-2):169-195
A key organizational challenge for all modern militaries is instituting an effective command-and-control (C2) structure for joint operations. China has been a relative latecomer to joint operations, with a persistent weakness in joint C2. Reforms launched in early 2016 sought to overcome this challenge by establishing a permanent two-level joint C2 structure. Although not a ‘tipping point’ that will lead ineluctably to stronger operational effectiveness, this reform is nonetheless an important milestone in an evolutionary process towards better PLA joint operations. The result could be added operational challenges for several of China’s neighbors and the United States. 相似文献