全文获取类型
收费全文 | 4162篇 |
免费 | 277篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 23篇 |
综合类 | 3篇 |
化学工业 | 744篇 |
金属工艺 | 74篇 |
机械仪表 | 72篇 |
建筑科学 | 144篇 |
矿业工程 | 11篇 |
能源动力 | 110篇 |
轻工业 | 791篇 |
水利工程 | 30篇 |
石油天然气 | 14篇 |
无线电 | 186篇 |
一般工业技术 | 643篇 |
冶金工业 | 1034篇 |
原子能技术 | 12篇 |
自动化技术 | 549篇 |
出版年
2023年 | 19篇 |
2022年 | 14篇 |
2021年 | 74篇 |
2020年 | 63篇 |
2019年 | 65篇 |
2018年 | 118篇 |
2017年 | 135篇 |
2016年 | 138篇 |
2015年 | 114篇 |
2014年 | 154篇 |
2013年 | 293篇 |
2012年 | 259篇 |
2011年 | 272篇 |
2010年 | 203篇 |
2009年 | 191篇 |
2008年 | 214篇 |
2007年 | 186篇 |
2006年 | 127篇 |
2005年 | 104篇 |
2004年 | 105篇 |
2003年 | 92篇 |
2002年 | 82篇 |
2001年 | 55篇 |
2000年 | 45篇 |
1999年 | 64篇 |
1998年 | 372篇 |
1997年 | 240篇 |
1996年 | 159篇 |
1995年 | 98篇 |
1994年 | 66篇 |
1993年 | 65篇 |
1992年 | 29篇 |
1991年 | 27篇 |
1990年 | 25篇 |
1989年 | 18篇 |
1988年 | 23篇 |
1987年 | 14篇 |
1986年 | 14篇 |
1985年 | 12篇 |
1984年 | 5篇 |
1983年 | 9篇 |
1982年 | 9篇 |
1981年 | 6篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1977年 | 11篇 |
1976年 | 33篇 |
1975年 | 3篇 |
1973年 | 2篇 |
1972年 | 2篇 |
排序方式: 共有4440条查询结果,搜索用时 187 毫秒
1.
Fernández-Godino M. Giselle Dubreuil Sylvain Bartoli Nathalie Gogu Christian Balachandar S. Haftka Raphael T. 《Structural and Multidisciplinary Optimization》2019,60(6):2205-2220
Structural and Multidisciplinary Optimization - When simulations are very expensive and many are required, as for optimization or uncertainty quantification, a way to reduce cost is using... 相似文献
2.
Federico Martín Bergero Francesco Casella Ernesto Kofman Joaquín Fernández 《Building Simulation》2018,11(2):405-418
Models describing energy consumption, heating, and cooling of buildings usually impose difficulties to the numerical integration algorithms used to simulate them. Stiffness and the presence of frequent discontinuities are among the main causes of those difficulties, that become critical when the models grow in size. Quantized State Systems (QSS) methods are a family of numerical integration algorithms that can efficiently handle discontinuities and stiffness in large models. For this reason, they are promising candidates for overcoming the mentioned problems. Based on this observation, this article studies the performance of QSS methods in some systems that are relevant to the field of building simulation. The study includes a performance comparison of different QSS algorithms against state-of-the-art classic numerical solvers, showing that the former can be more than one order of magnitude faster. 相似文献
3.
María Clara Verdi Constanza Melian Patricia Castellano Graciela Vignolo Mariana Blanco Massani 《International Journal of Food Science & Technology》2020,55(1):267-275
The effectiveness of antimicrobial mixtures against Listeria innocua 7, used as a L. monocytogenes surrogate, was investigated in broth and a food system. Synergistic effects were found for nisin (Nis), potassium sorbate (PS), calcium propionate (CP) and sodium lactate (SL), Nis + PS being the most effective binary mixture that exhibited listericidal activity in broth. To assess the effect of adding lactocin AL705 (AL705) to Nis + organic acid salt combinations, tridimensional isobolograms were generated. Sub-MIC combinations of the antimicrobials exerted bactericidal activity against L. innocua 7 after AL705 addition to the binary mixtures. However, when applied on Sardo cheese contaminated with L. innocua 7 (initial inoculum 4.45 ± 0.06 CFU g−1), only Nis + PS + AL705 produced count reductions respect to the control, reaching 3.04 ± 0.35 CFU g−1 counts after 15 days at 15 °C. Ternary combinations containing AL705 showed potential to reduce antimicrobial usages for L. innocua 7 inhibition. 相似文献
4.
Elisa Garza Montelongo María G. Sánchez Anguiano Leonor M. Blanco Jerez Eduardo D. Pereira Ulloa Bernabé L. Rivas Quiroz Perla Elizondo Martínez 《应用聚合物科学杂志》2020,137(40):49204
Poly(ethylene terephthalate)-based molecularly imprinted polymers (MIPs) were synthesized, and their recognition capability was evaluated. Adsorption isotherm was described by the Langmuir model and the maximum adsorption capacity of MIPTy reached 172.4 mg g−1 in water at pH 6.2. A recognition coefficient of 1.17 was obtained. A solid-phase extraction cartridge was manufactured and its behavior was evaluated for tylosin extraction from aqueous and milk samples. An off-line SPE-UV method was applied. An acceptable linearity was obtained in the range of 1–20 μg ml−1 and the average recovery at three spike levels in milk samples was higher than 92%. The limit of quantification was 2.6 × 10−2 μg ml−1. The manufactured SPE cartridge has a great potential for clean-up processes in complex media. The cartridge offers a fast and sensitive option to the existing sorbents for extracting this drug from milk samples. 相似文献
5.
6.
Hierarchical micro-nanostructured albite-based glass-ceramic for high dielectric strength insulators
V. Fuertes M.J. Cabrera J. Seores D. Muñoz J.F. Fernández E. Enríquez 《Journal of the European Ceramic Society》2018,38(7):2759-2766
A novel glass-ceramic material based on albite type Na-rich feldspar has been synthesized by conventional ceramic process. High crystallinity, >94%?Vol.% is obtained by fast sintering which allows energy saving processing. Albite is the main crystalline phase and tetragonal SiO2 is a secondary phase. Electrical properties were examined by complex impedance, DC measurements, and dielectric breakdown test. Dielectric characterization shows a non-Debye type dielectric behavior with low dielectric constant, 4.6 at 1?MHz, low dielectric losses, (~10?3 at 1?MHz, and a large dielectric strength, ~60?kV/mm), that it is the largest value reported in ceramic insulators. Those dielectric properties are attained by the low glassy phase content in the samples and their unique micro-nanostructure. All these properties make this novel material a very promising candidate in the market of ceramic electrical insulator, highlighting for high-voltage applications. 相似文献
7.
8.
Microbial Fuel Cell Application for Azoic Dye Decolorization with Simultaneous Bioenergy Production Using Stenotrophomonas sp. 下载免费PDF全文
Said Galai Antonia Pérez de los Ríos Francisco José Hernández‐Fernández Sihem Haj Kacem Francisco Mateo Ramírez Joaquín Quesada‐Medina 《化学工程与技术》2015,38(9):1511-1518
A single‐chamber air‐cathode microbial fuel cell (MFC) was successfully applied for decolorization of the diazoic dye Reactive Black 5 (RB5) with simultaneous production of electricity. An innovative low‐cost medium, the marine water‐glucose‐yeast extract medium (MWGY), was developed which appears as a textile marine effluent in terms of salinity. The anode compartment containing a single bacterial strain of Stenotrophomonas sp. showed almost complete dye decolorization with different RB5 concentrations after seven days of treatment. For the four dye concentrations used, a correlation between dye removal and production of electrical energy was found. The comparison of the decolorization process in the MFC with that in a batch reactor as control experiment highlights the efficiency of the single‐chamber air‐cathode MFC technology which improved the dye removal by the same bacterial strain. 相似文献
9.
Correlation of structural characterization and viscosity measurements with total unsaturation: An effective method for controlling ozonation in the preparation of ozonated grape seed and sunflower oils 下载免费PDF全文