全文获取类型
收费全文 | 20710篇 |
免费 | 2472篇 |
国内免费 | 1560篇 |
专业分类
电工技术 | 2252篇 |
综合类 | 2712篇 |
化学工业 | 473篇 |
金属工艺 | 830篇 |
机械仪表 | 3560篇 |
建筑科学 | 622篇 |
矿业工程 | 438篇 |
能源动力 | 309篇 |
轻工业 | 230篇 |
水利工程 | 297篇 |
石油天然气 | 338篇 |
武器工业 | 577篇 |
无线电 | 4639篇 |
一般工业技术 | 2125篇 |
冶金工业 | 348篇 |
原子能技术 | 180篇 |
自动化技术 | 4812篇 |
出版年
2024年 | 94篇 |
2023年 | 272篇 |
2022年 | 490篇 |
2021年 | 523篇 |
2020年 | 649篇 |
2019年 | 501篇 |
2018年 | 532篇 |
2017年 | 741篇 |
2016年 | 868篇 |
2015年 | 953篇 |
2014年 | 1268篇 |
2013年 | 1182篇 |
2012年 | 1602篇 |
2011年 | 1622篇 |
2010年 | 1202篇 |
2009年 | 1265篇 |
2008年 | 1256篇 |
2007年 | 1530篇 |
2006年 | 1364篇 |
2005年 | 1092篇 |
2004年 | 885篇 |
2003年 | 821篇 |
2002年 | 661篇 |
2001年 | 589篇 |
2000年 | 514篇 |
1999年 | 395篇 |
1998年 | 303篇 |
1997年 | 286篇 |
1996年 | 247篇 |
1995年 | 210篇 |
1994年 | 179篇 |
1993年 | 140篇 |
1992年 | 96篇 |
1991年 | 69篇 |
1990年 | 60篇 |
1989年 | 71篇 |
1988年 | 51篇 |
1987年 | 27篇 |
1986年 | 12篇 |
1985年 | 15篇 |
1984年 | 16篇 |
1983年 | 9篇 |
1982年 | 9篇 |
1981年 | 14篇 |
1980年 | 11篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 11篇 |
1956年 | 5篇 |
1955年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
H.264/AVC中Ⅰ帧的传输错误不仅会破坏当前的解码帧,还会在时间上扩散,对后续P帧的预测带来严重的影响。因此本文提出了一种通过计算受损宏块周围边缘方向的信息熵来自适应的选择双线性内插或方向性内插的错误隐藏方法。实验表明,该方法与单独使用双线性内插法或方向内插法相比,具有较好的误码掩盖效果,PSNR相比至少提高了0.27dB。 相似文献
102.
103.
异步脑—机接口的空闲状态检测新方法* 总被引:4,自引:0,他引:4
提出一种新的空闲状态检测方法,以训练集中各类运动想象样本的类内散度和正确检测率为指标,结合接收机曲线确定分类阈值,设计最佳三分类器,并采用模糊化技术对预测标签进行处理。将该方法应用于2005年BCI竞赛数据IVc,测试的均方误差为0.278 7。实验结果验证了该方法的有效性。 相似文献
104.
无定位图的预测误差差值扩展可逆数据隐藏* 总被引:1,自引:1,他引:0
将Tian差值扩展技术应用于彩色图像中,提出一种利用预测误差差值进行扩展嵌入的彩色图像可逆数据隐藏算法。针对传统差值扩展技术存在过分修改像素灰度值、须嵌入定位图等缺点,首先利用色彩分量间的相关性减小差值,并将差值扩展量分散到两个色彩分量中;其次,对直方图平移技术进行改进,使得同等嵌入率下图像质量达到最佳;最后由两个色彩分量中像素的预测值之和决定可用于扩展嵌入的像素,无须保存溢出定位图,提取端在提取信息时可无损地恢复原始图像。实验结果表明,与其他算法相比,该算法在同等嵌入率下可取得更好的图像质量,算法复杂度 相似文献
105.
In multistage machining processes(MMPs),the final quality of a part is influenced by a series of machining processes,which are complex correlations.So it is necessary to research the rule of machin-ing error propagation to ensure the machining quality.For this issue,a change management method of quality control nodes(i.e.,QC-nodes) for machining error propagation is proposed.A new framework of QC-nodes is proposed including association analysis of quality attributes,quality closed-loop control,error tracing... 相似文献
106.
Research on indoor experimentation of range SAL imaging system 总被引:1,自引:0,他引:1
GUO Liang XING MengDao ZHANG Long TANG Yu & BAO Zheng State Key Laboratory of Radar Signal Processing Xidian University Xi’an China Xi’an Polytechnic University Xi’an 《中国科学E辑(英文版)》2009,52(10):3098-3104
By means of advantages of both SAR and lidar, the combination of the techniques of (inverse) synthetic aperture and lidar makes it possible to obtain high resolution 2-D image. In this paper, an indoor experimental system of inverse synthetic aperture lidar imaging is given and a processing approach is presented. The given system is in the mode of lidar system with separated receiver and transmitter, which can effectively eliminate the jamming from the lens or/and the intersection between two optic fibers. ... 相似文献
107.
A novel network model of multiple source fountain coding is developed and a novel class of generic multiple source fountain codes with unequal error protection(UEP)property is proposed.The And–Or tree analysis technique is generalized to analyze the asymptotic performance of the proposed codes and a joint optimization method employing both linear and nonlinear programs is developed to optimize the degree distributions.Furthermore,we propose three basic methods to achieve UEP property and the performance of each method is discussed.We employ these analytical results and optimization method to design and discuss several UEP codes with two and four sources for different application scenarios.Simulation results verify that the proposed codes can be applied to the networks with any number of sources and can provide strong UEP property in various ways based on the proposed three basic methods. 相似文献
108.
The vector tracking algorithm uses a single extended Kalman filter (EKF) to predict the time-delays and the Doppler deviations of the GNSS signal, while also estimating the user's position, velocity, and clock state. In this paper, the effects of multipath on the tracking performance of the vector delay / frequency lock loop (VDFLL) is studied for better application in the multipath environment. The error expressions of the measurements are given in theory. The tracking error caused by multipath is reduced by VDFLL, which is proved by the tracking error of VDFLL through a new iterating method. The theoretical analysis is verified by the Monte Carlo simulation. 相似文献
109.
The sediment regime in the middle Yangtze River has been significantly changed from quasi-equilibrium to nonequilibrium since the impoundment of the Three Georges Reservoir (TGR). To understand the effects of the TGR on vertical distribution of suspended sediment concentration (SSC) and estimation accuracy of mean concentration, vertical sediment concentration and flow velocity data at the Shashi and Jianli hydrological stations in the reach before and after the impoundment were collected. Comparisons and analysis of vertical profiles of SSC before and after the TGR impoundment show that after the impoundment of the TGR, due to the coarsening of sediment particle size, the reduction in sediment load, and the significant decrease in sediment saturation, the vertical distribution of SSC in the downstream reaches became more uneven under medium and low water flows, which was reflected in the vertical gradient and the fluctuation degree of SSC significantly increased. In addition, the depth-average sediment concentrations were calculated by the selected-point method and the mean values calculated by the “multi-point method” were regarded as the “true mean” to evaluate the accuracy of the mean value calculated by the “few-point method.” It was found that the relative errors for the selected-point method were mainly positive before impoundment but mainly negative after impoundment. Additionally, the correction factors of one-point, two-point, and three-point methods and the position of the near-bed substituted point for the five-point method were given to reduce the error when the point measurements were used to calculate the depth-average sediment concentration in the downstream reaches. 相似文献
110.
为提高实时洪水预报精度,经常将水文模型与误差修正模型相结合,AR模型因其结构简单广泛应用于实时洪水预报误差修正。然而,实际应用显示,AR模型时常出现修正结果不稳定现象,表现为流量修正幅度过大,甚至出现“震荡”现象,严重影响修正效果。鉴于此,本文从矩阵特征值角度解释了AR模型出现不稳定现象的原因,并引入岭估计方法选择性利用流量信息更新自回归系数,使其更满足真实流量的涨落过程,增强该模型的稳健性。将新方法应用于蔺河口流域,结果显示岭估计方法显著提高了AR模型的稳健性,从而改善了模型修正效果,进一步提高了洪水预报精度。 相似文献