全文获取类型
收费全文 | 552篇 |
免费 | 76篇 |
国内免费 | 19篇 |
出版年
2024年 | 1篇 |
2023年 | 4篇 |
2022年 | 5篇 |
2021年 | 9篇 |
2020年 | 14篇 |
2019年 | 24篇 |
2018年 | 15篇 |
2017年 | 44篇 |
2016年 | 40篇 |
2015年 | 26篇 |
2014年 | 49篇 |
2013年 | 55篇 |
2012年 | 43篇 |
2011年 | 37篇 |
2010年 | 28篇 |
2009年 | 35篇 |
2008年 | 19篇 |
2007年 | 20篇 |
2006年 | 22篇 |
2005年 | 25篇 |
2004年 | 35篇 |
2003年 | 14篇 |
2002年 | 9篇 |
2001年 | 9篇 |
2000年 | 15篇 |
1999年 | 6篇 |
1998年 | 6篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 9篇 |
1994年 | 2篇 |
1993年 | 6篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 9篇 |
排序方式: 共有647条查询结果,搜索用时 15 毫秒
151.
针对电传动装甲车辆负载功率预测功能缺失导致控制作用滞后的问题,提出一种具有较高负载功率预测精度的实时能量管理策略。在分析整车结构的基础上,采用理论分析和数据拟合方法,建立各动力源数学模型。将差分自回归移动平均模型和自适应马尔可夫链两种预测方法相结合,设计非平稳趋势性负载功率组合预测方法。在非线性模型预测控制框架下,构建多目标优化函数,采用序列二次规划法在有限时域内实时求解最优控制指令,优化多动力源协调控制过程。依托硬件在环仿真平台进行多路面行驶实验,对比有无功率预测的能量管理控制效果。结果表明,改进的实时能量管理策略对未来负载功率具有较好的预见性,能够显著优化多动力源协调控制过程,提升车辆燃油经济性,稳定母线电压和电池荷电状态,对传统模型预测控制下的工程应用场景具有一定借鉴意义。 相似文献
152.
李军廷 《中国人民武装警察部队学院学报》2014,(6):67-69
消防业务信息系统日常运维任务是确保实时数据的可用性和完整性,信息能够得到及时处理应用,保障信息系统的正常运行及维护系统资源的安全.加强消防业务系统日常运维的管理标准,规范运维工作的方法,可以减少系统运维中不确定性因素,是提高消防业务工作质量和水平的重要保障. 相似文献
153.
传统军事思维的优秀“内核”是作战能力水平提升的重要“起搏器”,有助于现代条件下部队战斗力的提高。汲取其伐谋思维,注重信息思维,发挥超越思维,完善作战预测,这四种思维能够有助于促进作战思维整合、强化军事信息整合能力和创新能力,提升作战软实力,彰显强军之要,对实现强军目标有理论支撑和实践创新之力。 相似文献
154.
针对我国新一代全球导航星座长期构型维持控制问题,提出了MEO星座构型状态描述方法,分析了主要摄动力和轨道参数偏差作用下的星座构型演化规律,结合实测数据对稳定性规律进行了验证;研究了参数偏置摄动补偿控制原理,提出了一种改进的解耦控制方案,分析了星座部署时间对摄动补偿控制量的影响规律,得到了一些有益的关键性结论,为我国全球导航系统的星座构型设计和运控策略制定奠定了基础。 相似文献
155.
Bertrand Fonck 《Small Wars & Insurgencies》2014,25(4):767-783
In the late seventeenth century during the Dutch War (1672–1678) and the Nine Years War (1688–1697), French armies relied on small war for the accomplishment of essential tasks and as part of an overall strategy of exhausting their opponents in the Low Countries. The purposes of small war included the imposition of contributions on enemy populations, the destruction of the enemy base of operations, blockades of fortresses, and the general support of campaign armies. The expression ‘small war’ in the French language appeared with growing frequency in the 1690s. Small war can be viewed as both a cause and consequence of the characteristics of these wars. The limited policy goals of Louis XIV the king of France required a strategy that minimised risk and accomplished the goal of reducing if not eliminating the Spanish presence in the Low Countries that bordered the north of France. As French armies increased in size during this period, the demand for specialists at small increased in order to provide security and ensure supply. Small war in the late seventeenth century was thus not ideologically motivated insurgency, but in the minds of French commanders an essential component of strategy and the nature of war. 相似文献
156.
Sylvie Kleinman 《Small Wars & Insurgencies》2014,25(4):784-799
Secret French plans to launch guerrilla-style raids on the British Isles devised in the spring of 1796 were referred to as ‘chouanneries’. The name and concept behind these small-war operations were modelled on the irregular tactics used by the Chouan rebels in the Vendée, which the French state army had brutally quashed, but some wished to transfer into their institutional practice. Part of France's ongoing military strategy in the war against Britain, which included fomenting insurrection in Ireland, these irregular operations were to be manned partially by pardoned deserters and released convicts and prisoners of war. Of these, only Tate's brief invasion of Wales in 1797 was realised, but the surviving plans provide insightful historical lessons into an Anglophobic mindset shared by a small network of practitioners and policy deciders on the effectiveness of such shock and awe tactics. Largely motivated by the desire to take revenge for Britain's support of counter-revolutionaries in the Vendée, these plans could more aptly be referred to as counter-‘chouanneries’. 相似文献
157.
Iver Gabrielsen 《Small Wars & Insurgencies》2014,25(2):257-283
This article fills a gap in the research on Hezbollah by evaluating their military performance from their formation in 1982 and up till the 2006 Israel–Hezbollah war. This study tests the theses that Hezbollah had developed a very strong tactical proficiency in the late 1990s and that there are more similarities in their strategy and tactics during the 2006 war and the 1982–2000 insurgency in Southern Lebanon than previously assumed. Another central theme of this article is how Hezbollah has been constantly adapting and evolving for the duration of its existence. 相似文献
158.
针对径向基插值代理模型样本点预测误差为零时无法获得误差函数进行序列再采样优化的问题,将样本点分布约束引入序列再采样过程,利用潜在最优解加速收敛性,提出一种适用于径向基插值代理模型序列优化的再采样策略,该策略兼顾仿真模型的输出响应特性与样本点的空间分布特性。仿真结果表明,使用该在采样策略后,算法寻优效率和精度均优于传统基于代理模型的优化方法,在对最优解进行有效预测的同时,能显著减少原始模型计算次数。 相似文献
159.
160.