全文获取类型
收费全文 | 10893篇 |
免费 | 747篇 |
国内免费 | 20篇 |
专业分类
电工技术 | 116篇 |
综合类 | 10篇 |
化学工业 | 2620篇 |
金属工艺 | 312篇 |
机械仪表 | 329篇 |
建筑科学 | 325篇 |
矿业工程 | 34篇 |
能源动力 | 350篇 |
轻工业 | 1677篇 |
水利工程 | 61篇 |
石油天然气 | 25篇 |
无线电 | 967篇 |
一般工业技术 | 1838篇 |
冶金工业 | 1510篇 |
原子能技术 | 61篇 |
自动化技术 | 1425篇 |
出版年
2023年 | 75篇 |
2022年 | 206篇 |
2021年 | 442篇 |
2020年 | 280篇 |
2019年 | 294篇 |
2018年 | 426篇 |
2017年 | 387篇 |
2016年 | 452篇 |
2015年 | 379篇 |
2014年 | 512篇 |
2013年 | 884篇 |
2012年 | 602篇 |
2011年 | 624篇 |
2010年 | 521篇 |
2009年 | 510篇 |
2008年 | 516篇 |
2007年 | 440篇 |
2006年 | 341篇 |
2005年 | 265篇 |
2004年 | 250篇 |
2003年 | 225篇 |
2002年 | 210篇 |
2001年 | 180篇 |
2000年 | 163篇 |
1999年 | 156篇 |
1998年 | 247篇 |
1997年 | 175篇 |
1996年 | 158篇 |
1995年 | 121篇 |
1994年 | 127篇 |
1993年 | 113篇 |
1992年 | 102篇 |
1991年 | 61篇 |
1990年 | 87篇 |
1989年 | 101篇 |
1988年 | 74篇 |
1987年 | 70篇 |
1986年 | 76篇 |
1985年 | 77篇 |
1984年 | 95篇 |
1983年 | 89篇 |
1982年 | 60篇 |
1981年 | 75篇 |
1980年 | 56篇 |
1979年 | 44篇 |
1978年 | 29篇 |
1977年 | 38篇 |
1976年 | 51篇 |
1975年 | 36篇 |
1973年 | 27篇 |
排序方式: 共有10000条查询结果,搜索用时 578 毫秒
81.
We have designed a family of parallel data flow analysis algorithms for execution on distributed-memory MIMD machines, based on general-purpose, hybrid algorithms for data flow analysis [Marlowe and Ryder 1990]. We exploit a natural partitioning of the hybrid algorithms and explore a static mapping, dynamic scheduling strategy. Alternative mapping-scheduling choices and refinements of the flow graph condensation used are discussed. Our parallel hybrid algorithm family is illustrated on Reaching Definitions, although parallel algorithms also exist for many interprocedural (e.g., Aliasing) and intraprocedural (e.g., Available Expressions) problems [Marlowe 1989]. We have implemented the parallel hybrid algorithm for Reaching Definitions on an Intel iPSC/2. Our empirical results suggest the practicality of parallel hybrid algorithms.An earlier version of this paper was presented at Supercomputing '90.The research reported here was supported, in part, by the New Jersey Commission on Science and Technology and the CAIP Center's Industrial Members, by Siemens Research Corporation and by National Science Foundation grant CCR-8920078. 相似文献
82.
Melamed Barbara G.; Matthews Karen A.; Routh Donald K.; Stabler Brian 《Canadian Metallurgical Quarterly》1986,5(3):181
This article introduces the current issue of Health Psychology. The call for early intervention to prevent adulthood health problems and the need to consider each period of children's lives within its developmental perspective are the main emphases in this special issue of the journal. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
83.
K- and Q-bands CMOS frequency sources with X-band quadrature VCO 总被引:1,自引:0,他引:1
Sangsoo Ko Jeong-Geun Kim Taeksang Song Euisik Yoon Songcheol Hong 《Microwave Theory and Techniques》2005,53(9):2789-2800
Fully integrated 10-, 20-, and 40-GHz frequency sources are presented, which are implemented with a 0.18-/spl mu/m CMOS process. A 10-GHz quadrature voltage-controlled oscillator (QVCO) is designed to have output with a low dc level, which can be effectively followed by a frequency multiplier. The proposed multipliers generate signals of 20 and 40 GHz using the harmonics of the QVCO. To have more harmonic power, a frequency doubler with pinchoff clipping is used without any buffers or dc-level shifters. The QVCO has a low phase noise of -118.67 dBc/Hz at a 1-MHz offset frequency with a 1.8-V power supply. The transistor size effect on phase noise is investigated. The frequency doubler has a low phase noise of -111.67 dBc/Hz at a 1-MHz offset frequency is measured, which is 7 dB higher than a phase noise of the QVCO. The doubler can be tuned between 19.8-22 GHz and the output is -6.83 dBm. A fourth-order frequency multiplier, which is used to obtain 40-GHz outputs, shows a phase noise of -102.0 dBc/Hz at 1-MHz offset frequency with the output power of -18.0 dBm. A large tuning range of 39.3-43.67 GHz (10%) is observed. 相似文献
84.
On-line diagnosis of the machining operations is essential because it can prevent potential problems caused by abnormal conditions. So far, little research has been done for the on-line diagnosis of tapping operations. However, tapping is a very important machining operation. And the on-line diagnosis is essential. In this work, an artificial neural network was utilized for the diagnosis of the tapping operation. The input vector for the neural network is obtained by processing the signals of the thrust, torque, and lateral forces during the tapping operations. A total of ten indices were used in the input layer of the network. The output of the artificial neural network provides the tapping states. Five different tapping states were investigated: normal operation, tap wear, misalignment, oversize hole, and undersize hole. The weights and thresholds of the artificial neural network can be modified by the generalized delta rule. Experimental results showed that diagnosis of tapping operations through an artificial neural network can reach a success rate of over 95%. 相似文献
85.
Acoustic emission generated on thermal shocks makes it possible to investigate the processes of cracking that take place in high alumina refractories separately at heating and cooling stages, as well as on successive thermal shocks. It is dependent on the raw material type, technological process and the microstructure of products (i.e. number, size and shape of pores and cracks). The damage present after 20 thermal shocks in the material tested was illustrated by the microstructure examinations. 相似文献
86.
Distributed Multirobot Exploration and Mapping 总被引:3,自引:0,他引:3
Fox D. Ko J. Konolige K. Limketkai B. Schulz D. Stewart B. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2006,94(7):1325-1339
Efficient exploration of unknown environments is a fundamental problem in mobile robotics. We present an approach to distributed multirobot mapping and exploration. Our system enables teams of robots to efficiently explore environments from different, unknown locations. In order to ensure consistency when combining their data into shared maps, the robots actively seek to verify their relative locations. Using shared maps, they coordinate their exploration strategies to maximize the efficiency of exploration. This system was evaluated under extremely realistic real-world conditions. An outside evaluation team found the system to be highly efficient and robust. The maps generated by our approach are consistently more accurate than those generated by manually measuring the locations and extensions of rooms and objects. 相似文献
87.
Rattok Jack; Ross Barbara; Ben-Yishay Yehuda; Ezrachi Ora; Silver Saralyn; Lakin Phyllis; Vakil Eli; Piasetsky Eugene; Zide Ellen; Diller Leonard 《Canadian Metallurgical Quarterly》1992,6(4):395
Within a clinical demonstration program, 59 traumatically brain-injured patients were treated with 1 of 3 mixes of treatment. Mix 1 included cognitive remediation (CGR), small-group interpersonal (SGI) communication training, therapeutic community activities, and personal counseling. Mix 2 was similar to Mix 1 but stressed SGI exercises and eliminated CGR. Mix 3 emphasized CGR and eliminated SGI exercises. The efficacy of the treatment mixes was evaluated with performance on neuropsychological tests, improved independence in functional activities, measures of intra- and interpersonal functioning, and vocational outcome. Ss' participation in the program, irrespective of treatment mix, yielded improvements in (1) self-image, (2) quality of interpersonal relatedness and interaction, (3) involvement with others in naturalistic settings, and (4) vocational outcome. Overall, data point to the superiority of the balanced mix (Mix 1) over Mixes 2 and 3. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
88.
This paper presents the model of a k-out-of-n: G system with common mode outages. The objective is to analytically derive the mean operating mode between failures for a non-repairable component system. The average system failure time and the system availability are also considered. Then, the model is extended to a system with repairable components and unrestricted repair, in which service times are exponentially distributed. 相似文献
89.
Translated the MMPI into American Sign Language (ASL) via the back-translation procedure and recorded it on videotape to determine the linguistic equivalency of a sign language translation of a psychological test for use with deaf individuals. The bilingual retest technique was conducted whereby both forms of the instrument were administered to 28 ASL-English bilingual deaf Ss. Due to the advent of the MMPI-2 during the conduct of this study, a new set of T scores was calculated from the present MMPI data to compare the effect of shifting to the MMPI-2 norms. The results demonstrate adequate linguistic equivalencies of the ASL MMPI items and underscore the potential utility and practicality of future ASL translations of psychological tests for use with deaf individuals. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
90.
Barbara K. Reck Robert B. Gordon 《JOM Journal of the Minerals, Metals and Materials Society》2008,60(7):55-59
Nickel and chromium are essential ingredients in alloys increasingly important for energy-efficient, environmentally friendly
modern technology. Quantitative assessment of the flows of these metals through the world economy from resource extraction
to final disposal informs resource policy, energy planning, environmental science, and waste management. This article summarizes
the worldwide technological cycles of nickel and chromium in 2000. Stainless steel is the major use of these metals, but they
serve numerous other special needs, as in superalloys for high-temperature service, as plating materials, and in coinage.
Because they are used primarily in alloys, novel recycling issues arise as their use becomes more widespread.
“... the great New York and St. Louis double track, nickel plated railroad...”
— Norwalk, Ohio, Chronicle 10 March 1881 announces arrival of surveyors for the future Nickel Plate Railway
“Later [1911] I formed an alloy of Iron and Chromium, which showed remarkable resistance to rust and tarnish ... [It was]
rediscovered by an Englishman named Brearley, in 1914.”
—Elwood Haynes to Stephen F. Roberts, 17 January 1925 相似文献