全文获取类型
收费全文 | 1681篇 |
免费 | 49篇 |
国内免费 | 88篇 |
专业分类
系统科学 | 149篇 |
丛书文集 | 46篇 |
教育与普及 | 2篇 |
理论与方法论 | 4篇 |
现状及发展 | 6篇 |
综合类 | 1611篇 |
出版年
2024年 | 4篇 |
2023年 | 5篇 |
2022年 | 13篇 |
2021年 | 23篇 |
2020年 | 28篇 |
2019年 | 21篇 |
2018年 | 16篇 |
2017年 | 22篇 |
2016年 | 19篇 |
2015年 | 31篇 |
2014年 | 66篇 |
2013年 | 44篇 |
2012年 | 80篇 |
2011年 | 93篇 |
2010年 | 82篇 |
2009年 | 109篇 |
2008年 | 89篇 |
2007年 | 112篇 |
2006年 | 115篇 |
2005年 | 87篇 |
2004年 | 88篇 |
2003年 | 85篇 |
2002年 | 77篇 |
2001年 | 76篇 |
2000年 | 64篇 |
1999年 | 56篇 |
1998年 | 42篇 |
1997年 | 48篇 |
1996年 | 38篇 |
1995年 | 32篇 |
1994年 | 32篇 |
1993年 | 25篇 |
1992年 | 19篇 |
1991年 | 19篇 |
1990年 | 10篇 |
1989年 | 17篇 |
1988年 | 14篇 |
1987年 | 7篇 |
1986年 | 7篇 |
1985年 | 3篇 |
排序方式: 共有1818条查询结果,搜索用时 31 毫秒
81.
应用微分方程动力系统理论研究BBM—likeB(2,2)方程的圈波及周期圈波解。在某些参数条件下给出该方程平面系统的相图,根据相图找到圈波及周期圈波解的存在条件,并求出了这两种解的参数形式表达式。通过软件Mathematica模拟了这两种解的平面波形图。 相似文献
82.
基于回答集语义的逻辑程序提供了描述性问题求解的范例,而逻辑程序的一阶环公式提供了计算回答集的新方法——自动定理证明.本文研究了汉密尔顿回路逻辑程序的一阶环公式,证明了计算汉密尔顿回路的有助于提供计算效率的两个主要结果. 相似文献
83.
Yannian Lou Chaojie Zhang Xiaojun Jin Zhonghe Jin 《系统工程与电子技术(英文版)》2014,(6):949-958
In a system based on the phase lock loop(PLL), a trade-off must be made between the tracking precision and the dynamic performance if constant parameters are adopted. To overcome this drawback, a new method called no phase slipping adaptive bandwidth(NPS-AB) is proposed, which can adjust the loop bandwidth adaptively for different working conditions. As a result, both the tracking precision and the dynamic performance can be achieved concurrently. NPS-AB has two features to keep the loop stable: one is the capability of quick response to dynamics; the other is a series of additional constraints when the bandwidth is switched. Compared with other methods, there is no phase slipping during the adjustment process for NPS-AB. The phase integer ambiguity can be avoided and the phase value is kept valid. It is meaningful for carrier ranging systems. Simulation results show that NPS-AB can deal with sudden dynamics and keep the pseudo-range value stable in the entire dynamic process. 相似文献
84.
In this paper, the joint production and recycling problem is investigated for a hybrid manufacturing and remanufacturing system
where brand-new products are produced in the manufacturing plant and recycled products are remanufactured into as-new products
in the remanufacturing facility. Both the brand-new products and remanufactured products are used to satisfy customer demands.
Returns of used products that are recycled from customers are assumed to be stochastic and nonlinearly price-dependent. A
mathematical model is proposed to maximize the overall profit of the system through simultaneously optimizing the production
and recycling decisions, subject to two capacity constraints — the manufacturing capacity and the remanufacturing capacity.
Based on Lagrangian relaxation method, subgradient algorithm and heuristic algorithm, a solution approach is developed to
solve the problem. A representative example is presented to illustrate the system, and managerial analysis indicates that
the uncertainties in demand and return have much influence on the production and recycling policy. In addition, twenty randomly
produced examples are solved, and computational results show that the solution approach can obtain very good solutions for
all examples in reasonable time. 相似文献
85.
Abstract: A radiation hard phase-locked loop (PLL) is designed at 2.5 GHz using silicon on sapphire complementary metal-oxide-semiconductor process. Radiation hardness is achieved through improving circuit design without sacrificing real estate. Stability is guaranteed by a fully self-bias architecture. The lock time of PLL is minimized by maximizing the loop bandwidth. Frequency tuning range of voltage controlled oscillator is significantly enhanced by a novel load configuration. In addition, multiple bias stages, asynchronous frequency divider, and silicon on sapphire process jointly make the proposed PLL more radiation hard. Layout of this PLL is simulated by Cadence Spectre RF under both single event effect and total induced dose effect. Simulation results demonstrate excellent stability, lock time < 600 ns, frequency tuning range [1.57 GHz, 3.46 GHz], and jitter < 12 ps. Through comparison with PLLs in literatures, the PLL is especially superior in terms of lock time and frequency tuning range performances. 相似文献
86.
87.
本文对WL算法和其加速方法TSVQ进行研究。通过对搜索范围的分析提出了一种通过设置搜索带、减少匹配点搜索范围的方法来确定搜索区间,并进行了实验验证。实验证明与TSVQ加速方法相比,本方法能够使合成速度大大提高,并且算法实现上更简单。 相似文献
88.
利用Monte Carlo(蒙特卡洛)方法结合快速傅里叶变换,模拟不同形状的偏心铁纳米环的磁特性.研究结果表明:偏心铁纳米环的磁滞回线与对称系统的磁滞回线类似,均具有双稳态,即存在明显的"vortex"态(涡旋态)与"onion"态(洋葱态).模拟结果还表明,相较于对称纳米环,偏心铁纳米环系统具有更为复杂的过渡状态.这说明形状和结构的不对称性对铁磁纳米环的磁化行为有一定的影响.这一结果对实验研究及磁性纳米环的实际应用具有很好的指导和参考意义. 相似文献
89.
针对舰载导弹系统精度检测分析自动化问题和缺乏检测全系统总体精度指标的问题,根据大闭环思想和导弹武器系统特点设计了导弹武器系统联调精度分析仪的结构,建立了联调战术态势运动学和误差分析模型。为保证实装系统安全性要求,对实装数据的采集采用外挂方式和软硬件结合方式,并建立实装系统数据采集和分析的数学模型。确定射击精度和捕捉概率来作为系统总体精度指标,并论述了总体精度指标的检验原理和方法。设计的精度分析仪无论对实装的日常检测还是舰艇大修后的整体精度指标测试,都有经济和军事意义。 相似文献
90.