全文获取类型
收费全文 | 1612篇 |
免费 | 86篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 21篇 |
综合类 | 1篇 |
化学工业 | 464篇 |
金属工艺 | 23篇 |
机械仪表 | 33篇 |
建筑科学 | 50篇 |
矿业工程 | 3篇 |
能源动力 | 48篇 |
轻工业 | 129篇 |
水利工程 | 13篇 |
石油天然气 | 10篇 |
无线电 | 129篇 |
一般工业技术 | 295篇 |
冶金工业 | 182篇 |
原子能技术 | 22篇 |
自动化技术 | 278篇 |
出版年
2023年 | 23篇 |
2022年 | 71篇 |
2021年 | 59篇 |
2020年 | 40篇 |
2019年 | 51篇 |
2018年 | 50篇 |
2017年 | 52篇 |
2016年 | 65篇 |
2015年 | 48篇 |
2014年 | 57篇 |
2013年 | 124篇 |
2012年 | 92篇 |
2011年 | 100篇 |
2010年 | 62篇 |
2009年 | 81篇 |
2008年 | 74篇 |
2007年 | 60篇 |
2006年 | 51篇 |
2005年 | 50篇 |
2004年 | 36篇 |
2003年 | 32篇 |
2002年 | 33篇 |
2001年 | 23篇 |
2000年 | 14篇 |
1999年 | 13篇 |
1998年 | 34篇 |
1997年 | 17篇 |
1996年 | 21篇 |
1995年 | 17篇 |
1994年 | 19篇 |
1993年 | 11篇 |
1992年 | 10篇 |
1989年 | 9篇 |
1988年 | 10篇 |
1987年 | 9篇 |
1984年 | 10篇 |
1982年 | 11篇 |
1981年 | 7篇 |
1979年 | 6篇 |
1978年 | 7篇 |
1977年 | 7篇 |
1976年 | 10篇 |
1975年 | 8篇 |
1974年 | 10篇 |
1973年 | 6篇 |
1971年 | 9篇 |
1970年 | 8篇 |
1968年 | 6篇 |
1967年 | 6篇 |
1966年 | 15篇 |
排序方式: 共有1701条查询结果,搜索用时 15 毫秒
51.
Dmitry Oshchepkov Irina Chadaeva Rimma Kozhemyakina Karina Zolotareva Bato Khandaev Ekaterina Sharypova Petr Ponomarenko Anton Bogomolov Natalya V. Klimova Svetlana Shikhevich Olga Redina Nataliya G. Kolosova Maria Nazarenko Nikolay A. Kolchanov Arcady Markel Mikhail Ponomarenko 《International journal of molecular sciences》2022,23(5)
52.
53.
In this paper, the problem of mining complex temporal patterns in the context of multivariate time series is considered. A new method called the Fast Temporal Pattern Mining with Extended Vertical Lists is introduced. The method is based on an extension of the level‐wise property, which requires a more complex pattern to start at positions within a record where all of the subpatterns of the pattern start. The approach is built around a novel data structure called the Extended Vertical List that tracks positions of the first state of the pattern inside records and links them to appropriate positions of a specific subpattern of the pattern called the prefix. Extensive computational results indicate that the new method performs significantly faster than the previous version of the algorithm for Temporal Pattern Mining; however, the increase in speed comes at the expense of increased memory usage. 相似文献
54.
In this paper, we analyse a systematically designed and easily tunable backstepping-based boundary control concept for a gantry crane with heavy chain and payload. The corresponding closed-loop system is formulated as an abstract evolution equation in an appropriate Hilbert space. Non-restrictive conditions for the controller coefficients are derived, under which the solutions are described by a C0-semi-group of contractions, and are asymptotically stable. Moreover, by applying Huang's theorem we can finally even show that under these conditions the controller renders the closed-loop system exponentially stable. 相似文献
55.
56.
Gyeong-Hoi Koo James J. Sienicki Anton Moisseytsev 《Nuclear Engineering and Design》2007,237(8):802-813
In this paper, preliminary structural evaluations of the reactor vessel and support design of the STAR-LM (The Secure, Transportable, Autonomous Reactor – Liquid Metal variant), which is a lead-cooled reactor, are carried out with respect to an elevated temperature design and seismic design. For an elevated temperature design, the structural integrity of a direct coolant contact to the reactor vessel is investigated by using a detail structural analysis and the ASME-NH code rules. From the results of the structural analyses and the integrity evaluations, it was found that the design concept of a direct coolant contact to the reactor vessel cannot satisfy the ASME-NH rules for a given design condition. Therefore, a design modification with regards to the thermal barrier is introduced in the STAR-LM design. For a seismic design, detailed seismic time history response analyses for a reactor vessel with a consideration of a fluid–structure interaction are carried out for both a top support type and a bottom support type. And from the results of the hydrodynamic pressure responses, an investigation of the minimum thickness design of the reactor vessel is tentatively carried out by using the ASME design rules. 相似文献
57.
Anna M. C. Maan Anton H. Hofman Wiebe M. de Vos Marleen Kamperman 《Advanced functional materials》2020,30(32)
While nature has optimized its antifouling strategies over millions of years, synthetic antifouling coatings have not yet reached technological maturity. For an antifouling coating to become technically feasible, it should fulfill many requirements: high effectiveness, long‐term stability, durability, ecofriendliness, large‐scale applicability, and more. It is therefore not surprising that the search for the perfect antifouling coating has been going on for decades. With the discovery of metal‐based antifouling paints in the 1970s, fouling was thought to be a problem of the past, yet its untargeted toxicity led to serious ecological concern, and its use became prohibited. As a response, research shifted focus toward a biocompatible alternative: polymer‐based antifouling coatings. This has resulted in numerous advanced and innovative antifouling strategies, including fouling‐resistant, fouling‐release, and fouling‐degrading coatings. Here, these novel and exciting discoveries are highlighted while simultaneously assessing their antifouling performance and practical feasibility. 相似文献
58.
Johan M. Ahlstrm Alberto Alamia Anton Larsson Claes Breitholtz Simon Harvey Henrik Thunman 《国际能源研究杂志》2019,43(3):1171-1190
The demand for biofuels and biochemicals is expected to increase in the future, which will in turn increase the demand for biomass feedstock. Large gasification plants fueled with biomass feedstock are likely to be a key enabling technology in a resource‐efficient, bio‐based economy. Furthermore, the costs for producing biofuels and biochemicals in such plants could potentially be decreased by utilizing inexpensive low‐grade residual biomass as feedstock. This study investigates the usage of shredded tree bark as a feedstock for the production of biomethane in the GoBiGas demonstration plant in Gothenburg, Sweden, based on a 32 MWth industrial dual fluidized bed gasification unit. The plant was operated with bark feedstock for 12 000 hours during the period 2014 to 2018. Data from the measurement campaign were processed using a stochastic approach to establish the plant's mass and energy balances, which were then compared with operation of the plant with wood pellets. For this comparison, an extrapolation algorithm was developed to predict plant performance using bark dried to the same moisture content as wood pellets, ie, 8%w.b. Plant operation with bark feedstock was evaluated for operability, efficiency, and feedstock‐related cost. The gas quality achieved during the test period was similar to that obtained for operation with wood pellets. Furthermore, no significant ash sintering or agglomeration problems were observed more than 750 hours of operation. The calculated biomass‐to‐biomethane efficiency is 43% to 47% (lower heating value basis) for operation with wet bark. However, the predicted biomass‐to‐biomethane efficiency can be increased to 55%–65% for operation with bark feedstock dried to 8% moisture content, with corresponding feedstock costs in the range of 24.2 to 32.7 EUR/MWh; ie, a cost reduction of about 40% compared with wood pellets. 相似文献
59.