全文获取类型
收费全文 | 11694篇 |
免费 | 948篇 |
国内免费 | 663篇 |
学科分类
工业技术 | 13305篇 |
出版年
2024年 | 29篇 |
2023年 | 104篇 |
2022年 | 188篇 |
2021年 | 270篇 |
2020年 | 300篇 |
2019年 | 271篇 |
2018年 | 285篇 |
2017年 | 317篇 |
2016年 | 431篇 |
2015年 | 439篇 |
2014年 | 581篇 |
2013年 | 682篇 |
2012年 | 781篇 |
2011年 | 919篇 |
2010年 | 690篇 |
2009年 | 761篇 |
2008年 | 635篇 |
2007年 | 776篇 |
2006年 | 759篇 |
2005年 | 664篇 |
2004年 | 545篇 |
2003年 | 496篇 |
2002年 | 372篇 |
2001年 | 319篇 |
2000年 | 267篇 |
1999年 | 252篇 |
1998年 | 248篇 |
1997年 | 177篇 |
1996年 | 160篇 |
1995年 | 130篇 |
1994年 | 97篇 |
1993年 | 70篇 |
1992年 | 65篇 |
1991年 | 40篇 |
1990年 | 36篇 |
1989年 | 33篇 |
1988年 | 26篇 |
1987年 | 20篇 |
1986年 | 11篇 |
1985年 | 4篇 |
1984年 | 13篇 |
1983年 | 3篇 |
1982年 | 5篇 |
1981年 | 7篇 |
1980年 | 5篇 |
1979年 | 2篇 |
1966年 | 2篇 |
1965年 | 3篇 |
1959年 | 6篇 |
1951年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Angela Altomare Carmelo Giacovazzo Anna Grazia Giuseppina Moliterni Rosanna Rizzi 《Journal of research of the National Institute of Standards and Technology》2004,109(1):125-132
The ab-initio crystal structure solution by powder diffraction data requires great efforts because of the collapse of the experimental information onto the one dimensional 2θ axis of the pattern. Different strategies will be described aiming at improving the process of extraction of the integrated intensities from the experimental pattern in order to make more straightforward the structure solution process by direct methods. Particular attention will be devoted to the EXPO program. Some of its performance will be analysed and results will be shown. 相似文献
22.
多孔粒状铵油炸药在边坡预裂爆破中的应用 总被引:3,自引:0,他引:3
通过工程实践,介绍了利用多孔粒状铵油炸药进行边坡预裂爆破的设计原理及施工工艺。该技术能确保预裂爆破质量。简化施工工序,大幅度降低爆破成本。技术经济指标优越。 相似文献
24.
25.
26.
Odors seem to be perceived differently when presented ortho- or retronasally. In this study, stimuli of controlled concentration and duration were applied in either the anterior nasal cavity or epipharynx by means of air-dilution olfactometry. Stimulus concentration was monitored in the olfactory cleft. In Experiment 1, odor thresholds to a food (chocolate) and a nonfood (lavender) odor were lower for orthonasal, compared with retronasal, stimulation. In Experiment 2, intensity ratings to suprathreshold odor concentrations were significantly higher for orthonasal than for retronasal stimulation with hydro- hydrogen sulfide, but not phenyl ethyl alcohol. Accordingly, amplitudes and latencies of olfactory event-related gen potentials to retronasal stimuli were found to be smaller and prolonged, respectively. This indicates differential processing of olfactory stimuli presented through the retronasal or orthonasal routes. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
27.
28.
Motion picture films are susceptible to local degradations such as dust spots. Other deteriorations are global such as intensity
and spatial jitter. It is obvious that motion needs to be compensated for before the detection/correction of such local and
dynamic defects. Therefore, we propose a hierarchical motion estimation method ideally suited for high resolution film sequences.
This recursive block-based motion estimator relies on an adaptive search strategy and Radon projections to improve processing
speed. The localization of dust particles then becomes straightforward. Thus, it is achieved by simple inter-frame differences
between the current image and motion compensated successive and preceding frames. However, the detection of spatial and intensity
jitter requires a specific process taking advantage of the high temporal correlation in the image sequence. In this paper,
we present our motion compensation-based algorithms for removing dust spots, spatial and intensity jitter in degraded motion
pictures. Experimental results are presented showing the usefulness of our motion estimator for film restoration at reasonable
computational costs.
Received: 9 July 2000 / Accepted: 13 January 2002
Correspondence to:S. Boukir 相似文献
29.
Treated was an anti-plane crack perpendicular to the interface of an exponential-type FGM strip bonded to another linear-type
FGM substrate with infinite thickness. Through Fourier integral transform, the problem was reduced as a Cauchy singular integral
equation, which was further solved numerically by the Lobatto–Chebyshev collocation method. Based on the numerical solution,
the effects of the geometrical and physical parameters on the stress intensity factor (SIF) were analyzed and the following
conclusions were obtained: (a) A notable discrepancy between the interface-perpendicular crack and the interfacial one is
that, to reduce the weak-discontinuity of interface or to make the interface micro-discontinuous will not necessarily decrease
the SIF of the former, but will surely decrease that of the latter. (b) When a crack tip is situated very near to the interface
(or free surface), its SIF will be high and totally dominated by the interface (or free surface). (c) To increase the stiffness
of the FGM on one side of the interface is beneficial to preventing the crack on the other side from growing toward the interface.
Besides, some practical suggestions were further given for material design in the field of composites. 相似文献
30.
Francesco Sarti Yaacov ArkinJean Chorowicz Arnon KarnieliTeresa Cunha 《Remote sensing of environment》2003,86(2):141-149
Differential radar interferometry, using archived ERS data over the region of the Dead Sea Transform, allows to detect ground movement (subsidence or uplift) in playas within the southern Arava Valley segment of the Dead Sea Rift. These measurements are consistent with a mean displacement rate of about 0.4 cm/month, in the direction of the radar beam, during the 8-month period preceding the Nuweiba earthquake of 22 November 1995. In the 3 years following the earthquake, the measured rate was smaller by a factor of 10. These movements are not related to salt diapirs or water pumping activities in the area. The exact location, along faults, suggests a possible correlation with pre-seismic and post-seismic fault deformation.A simple fault model consistent with the observed phenomena associates the observed subsidence/uplift to right and left stepping en-echelon fault patterns related to inter-seismic tensional accumulation along the faults. Further observations are necessary on this site and similar fault areas to corroborate the correlation between seismic activity and the observed phenomena. Monitoring of these sites should continue with differential Global positioning system (GPS) measurements and radar interferometric analysis using Envisat and Radarsat as well as archived data (including J-ERS). 相似文献