全文获取类型
收费全文 | 28930篇 |
免费 | 2707篇 |
国内免费 | 1423篇 |
专业分类
电工技术 | 1779篇 |
技术理论 | 1篇 |
综合类 | 2292篇 |
化学工业 | 4937篇 |
金属工艺 | 1750篇 |
机械仪表 | 1826篇 |
建筑科学 | 2369篇 |
矿业工程 | 796篇 |
能源动力 | 790篇 |
轻工业 | 2029篇 |
水利工程 | 588篇 |
石油天然气 | 1424篇 |
武器工业 | 273篇 |
无线电 | 3217篇 |
一般工业技术 | 3384篇 |
冶金工业 | 1288篇 |
原子能技术 | 259篇 |
自动化技术 | 4058篇 |
出版年
2024年 | 120篇 |
2023年 | 420篇 |
2022年 | 677篇 |
2021年 | 1030篇 |
2020年 | 761篇 |
2019年 | 723篇 |
2018年 | 755篇 |
2017年 | 801篇 |
2016年 | 719篇 |
2015年 | 1087篇 |
2014年 | 1252篇 |
2013年 | 1504篇 |
2012年 | 1730篇 |
2011年 | 1853篇 |
2010年 | 1713篇 |
2009年 | 1774篇 |
2008年 | 1657篇 |
2007年 | 1609篇 |
2006年 | 1772篇 |
2005年 | 1455篇 |
2004年 | 1113篇 |
2003年 | 1196篇 |
2002年 | 1440篇 |
2001年 | 1223篇 |
2000年 | 793篇 |
1999年 | 807篇 |
1998年 | 572篇 |
1997年 | 460篇 |
1996年 | 454篇 |
1995年 | 397篇 |
1994年 | 285篇 |
1993年 | 242篇 |
1992年 | 179篇 |
1991年 | 112篇 |
1990年 | 93篇 |
1989年 | 79篇 |
1988年 | 64篇 |
1987年 | 38篇 |
1986年 | 15篇 |
1985年 | 20篇 |
1984年 | 14篇 |
1983年 | 12篇 |
1982年 | 14篇 |
1981年 | 6篇 |
1980年 | 12篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1959年 | 1篇 |
1951年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
纯铜双层辉光离子渗钛组织形成机理及性能分析 总被引:6,自引:0,他引:6
采用双层辉光离子渗金属技术对纯铜进行了渗钛处理。用配有能谱仪(EDS)的扫描电子显微镜(SEM)、X射线衍射仪和透射电子显微镜对合金层的显微组织形貌、钛含量分布、相组成及相结构类型进行了观察与测定,对合金层的形成机理进行了探讨,并对其性能进行了对比测定。结果表明:渗钛层由合金层和扩散层组成,合金层主要由TiCu (Cu)固溶体 TiCu4构成,TiCu4为Dla型有序相,TiCu为B2型有序相,扩散层为(Cu)固溶体。渗钛处理后纯铜的表面得到显著强化。 相似文献
92.
本文通过两栋不同加固方案的二层农村楼房抗采动现场试验结果的分析,对不同加固措施的作用机理、效果及其设置条件进行了研究探讨,并提出,在农村采动区兴建抗采动变形楼房,是解放村庄下压煤、节约耕地和降低加固费用的途径。 相似文献
93.
94.
Ao Sheng Rong Zhong Liang Sun 《Antennas and Propagation, IEEE Transactions on》1991,39(9):1366-1371
The radiation of millimeter waves from the nonradiative dielectric (NRD) leaky wave antennas with the tapered transition and the tuning aperture is investigated. An accurate theory for the leakage constant and the phase constant of the antennas is presented, which is based on the generalized scattering parameters considering the higher-order mode interactions at the discontinuities. The associated transverse equivalent network involves the characterization of the mode couplings at two air-to-dielectric interfaces, the coupled mode analysis of the tapered transition, and the calculation of the radiation fields at the tuning aperture via the extended spectral domain approach. The interesting behavior of the present modified configuration of NRD leaky wave antennas is illustrated by typical examples. The validity of the theory is confirmed by the comparison of the theoretical results with experimental data for the limiting cases 相似文献
95.
The network model is given and used to calculate the oscillating frequency of thermoacoustic prime mover. Theoretically calculated frequency by the model is plural, whose real part denotes actual frequency of the system, and imaginary part means attenuation coefficient of acoustic pressure. Numerical calculation is made under different conditions including different acoustic cavities, spacing between each parallel plate, gas pressures and system lengths. Theoretically calculated frequency and experimentally measured frequency are in quite good agreement. 相似文献
96.
97.
Z.M. Zhong J. Chen P. Zhong J.B. Wu 《The International Journal of Advanced Manufacturing Technology》2006,28(9):855-862
As the result of vibration emission in air, a machine sound signal carries important information about the working condition
of machinery. But in practice, the sound signal is typically received with a very low signal-to-noise ratio. To obtain features
of the original sound signal, uncorrelated sound signals must be removed and the wavelet coefficients related to fault condition
must be retrieved. In this paper, the blind source separation technique is used to recover the wavelet coefficients of a monitored
source from complex observed signals. Since in the proposed blind source separation (BSS) algorithms it is generally assumed
that the number of sources is known, the Gerschgorin disk estimator method is introduced to determine the number of sound
sources before applying the BSS method. This method can estimate the number of sound sources under non-Gaussian and non-white
noise conditions. Then, the partial singular value analysis method is used to select these significant observations for BSS
analysis. This method ensures that signals are separated with the smallest distortion. Afterwards, the time-frequency separation
algorithm, converted to a suitable BSS algorithm for the separation of a non-stationary signal, is introduced. The transfer
channel between observations and sources and the wavelet coefficients of the source signals can be blindly identified via
this algorithm. The reconstructed wavelet coefficients can be used for diagnosis. Finally, the separation results obtained
from the observed signals recorded in a semi-anechoic chamber demonstrate the effectiveness of the presented methods . 相似文献
98.
The stability of five major phenolics, namely (−)-epicatechin (EC), procyanidin B2 (PC-B2), chlorogenic acid (ChA), hyperoside (HP) and isoquercitrin (IQ), in hawthorn fruits and a canned hawthorn drink were evaluated during 6 months of storage in the dark at three different temperatures (4, 23 and 40 °C). HPLC with a diode-array detector was used to determine the contents of the individual compounds. The results showed that the studied phenolics in the hawthorn fruits and the drink were both stable at 4 °C and relatively unstable at 23 and 40 °C with varied extents of degradation. At room temperature (23 °C), marked degradations of EC and PC-B2 were observed in both the fruits and the drink with around 50% and 30% decrease after a 6-month storage, respectively. A more significant decrease of the phenolics was observed at 40 °C, especially for EC and PC-B2, which were almost completely degraded after a 6-month storage. HP, IQ and ChA were relatively stable at 23 °C, but unstable at 40 °C. Therefore, low-temperature storage is recommended for maintaining the quality and efficacy of hawthorn fruits and its preparations. 相似文献
99.
阐述了离心式冷水机且在线监控系统的工作特点以及对监控的要求,说明了在线监控系统的基本配置,关键技术点和功能模块化的软硬件设计。 相似文献
100.
PURPOSE: To evaluate the accuracy of measuring intraocular pressure by handheld non-contact applanation tonometer. METHOD: 58 patients' (113 eyes) intraocular pressure were measured by Keeler, non-contact tonometer and R 900 Goldmann applanation tonometer and the results of measurement of intraocular pressure by the two kinds of tonometers were compared. RESULT: The mean intraocular pressure measured by non-contact is 16.31 +/- 5.59 mmHg and 17.49 +/- 6.13 mmHg (1 mmHg = 0.1333 kPa) by Goldmann applanation tonometer, respectively. There was no statistical significance to be found (P > 0.05) between the two methods. By linear correlation and regression analysis, a positive correlation was found between the two methods (r = 0.8942, b = 0.8154). CONCLUSION: The handheld non-contact tonometer has the same accuracy and reliability of measurement of intraocular pressure comparing with Goldmann applanation tonometer, and it can be used in glaucoma clinic and screening. 相似文献