全文获取类型
收费全文 | 3256篇 |
免费 | 166篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 23篇 |
综合类 | 4篇 |
化学工业 | 848篇 |
金属工艺 | 28篇 |
机械仪表 | 55篇 |
建筑科学 | 122篇 |
矿业工程 | 10篇 |
能源动力 | 129篇 |
轻工业 | 522篇 |
水利工程 | 35篇 |
石油天然气 | 8篇 |
无线电 | 275篇 |
一般工业技术 | 452篇 |
冶金工业 | 80篇 |
原子能技术 | 34篇 |
自动化技术 | 799篇 |
出版年
2024年 | 4篇 |
2023年 | 40篇 |
2022年 | 127篇 |
2021年 | 158篇 |
2020年 | 88篇 |
2019年 | 106篇 |
2018年 | 117篇 |
2017年 | 120篇 |
2016年 | 151篇 |
2015年 | 103篇 |
2014年 | 192篇 |
2013年 | 274篇 |
2012年 | 262篇 |
2011年 | 260篇 |
2010年 | 199篇 |
2009年 | 202篇 |
2008年 | 181篇 |
2007年 | 165篇 |
2006年 | 95篇 |
2005年 | 92篇 |
2004年 | 71篇 |
2003年 | 80篇 |
2002年 | 57篇 |
2001年 | 27篇 |
2000年 | 26篇 |
1999年 | 35篇 |
1998年 | 30篇 |
1997年 | 23篇 |
1996年 | 27篇 |
1995年 | 21篇 |
1994年 | 17篇 |
1993年 | 14篇 |
1992年 | 11篇 |
1991年 | 5篇 |
1990年 | 10篇 |
1989年 | 10篇 |
1988年 | 3篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1978年 | 4篇 |
1973年 | 1篇 |
排序方式: 共有3424条查询结果,搜索用时 15 毫秒
131.
132.
133.
134.
Carolina Blanco Raúl Bodas Sonia Andrés Jose María Rodríguez-Calleja Javier Mateo Fernando Rozada F. Javier Giráldez 《International Journal of Food Science & Technology》2020,55(3):1119-1125
Thirty-two lambs were finished on a total mixed ration (TMR) pelleted alone (00SS) or including sunflower soap stock (SS): 15SS (15 g SS per kg TMR), 30SS (30 g SS per kg TMR) and 60SS (60 g SS per kg TMR). Lambs (8 per group) were slaughtered at 27 kg live weight. Colour evolution, lipid oxidation, microbial growth and detection of diarrhoeagenic Escherichia coli were studied in meat samples. SS in the diet reduced meat lipid oxidation (P < 0.05), but had no significant effect (P > 0.05) on the cholesterol oxidation products. Meat from 60SS and control animals (00SS) revealed greater discoloration (P < 0.05) than 15SS. SS supplementation did not affect the microbiological populations, whereas high doses of SS seemed to increase the proliferation of diarrhoeagenic E. coli on day 14 (P < 0.10). These results suggest that the rate of SS inclusion in the diet of fattening lambs should not be above 15 g SS per kg TMR. 相似文献
135.
Andoni Rodriguez‐Abetxuko Pablo Muumer Mitsuhiro Okuda Javier Calvo Mato Knez Ana Beloqui 《Advanced functional materials》2020,30(35)
Herein, the design, synthesis, and characterization of bifunctional hybrid nanoreactors used for concurrent one‐pot chemoenzymatic reactions are shown. In the design, the enzyme, glucose oxidase, is wrapped with a peroxidase‐mimetic catalytic polymer. Hemin, the organic catalyst, is linked to the flexible polymeric scaffold through coordination to the imidazole groups that hang out the network. This spatial arrangement, which works as a metabolic channel, is optimized for cooperative chemoenzymatic reactions in which the enzyme catalyzes first. A deep characterization of the integrated nanoreactors demonstrates that the confinement of two distinct catalytic sites in the nanospace is very effective in one‐pot reactions. Moreover, besides its role as scaffold material, the polymeric mantel protects both the biocatalyst and the chemical catalyst from degradation and inactivation in the presence of organic solvents. Furthermore, the polymeric environment of the nanoreactors can be tailored in order to trigger the assembly of those into highly active heterogeneous hybrid catalysts. Finally, the new nanoreactors are applied to the efficient degradation of organic aromatic compounds using glucose as the only fuel. 相似文献
136.
137.
Marco Baldi Franco Chiaraluce Nicola Maturo Giacomo Ricciutelli Alessandro Ardito Francesco Barbaglio Stefano Finocchiaro Lorenzo Simone Ricard Abell Javier De Vicente Mattia Mercolino 《International Journal of Satellite Communications and Networking》2019,37(6):571-587
A thorough analysis of the behavior of error‐correcting codes over space links affected by solar scintillation is presented. The relevant channel parameters are fixed through the development of a model based on real missions' data. Both telecommand and telemetry links are considered in fast and slow fading conditions. Besides classical coherent modulation schemes, the possibility to use noncoherent modulation schemes is considered, to eliminate the problem of phase tracking. For the case of channels with very slow fading, the use of external interleavers or erasure coding is proposed to cope with error bursts. 相似文献
138.
de Fuentes Jose M. Gonzalez-Manzano Lorena Lopez Javier Peris-Lopez Pedro Choo Kim-Kwang Raymond 《Mobile Networks and Applications》2019,24(3):878-880
Mobile Networks and Applications - 相似文献
139.
140.
Proteolytic and lipolytic changes during the ripening of León raw cow's milk cheese, a Spanish traditional variety 总被引:1,自引:0,他引:1
Bernardo Prieto Inmaculada Franco Josefa González Prieto Ana Bernardo & Javier Carballo 《International Journal of Food Science & Technology》2002,37(6):661-671
Proteolytic and lipolytic changes were studied throughout ripening of five batches of León cow's milk cheese, a traditional variety made in the north of Spain. Total soluble nitrogen, non-protein nitrogen, oligopeptides nitrogen, amino nitrogen and ammonia nitrogen fractions increased slightly during the ripening process. The final values of these nitrogen fractions indicate that this cheese undergoes a very slight proteolysis as much in extent as in depth. This weak protein degradation is corroborated when the caseins and their degradation products were quantified by electrophoresis. β-Casein stayed practically intact throughout the ripening process and only 10% of αs -casein became degraded. The content of total free amino acids increased progressively but in a slightly increased way during ripening, reaching final average values of 592 mg (100 g)−1 of total solids. The most abundant free amino acid at the end of ripening was lysine, followed by leucine, glutamic acid, tryptophan, valine and phenylalanine. The acidity index of the fat values increased during ripening by a factor of 4.39. The final values of this parameter are in the range of those observed in other cow's milk cheeses ripened by bacteria. The content in total free fatty acids underwent an increase throughout ripening reaching final average values of 6669 ppm. The most abundant free fatty acid at the end of ripening was oleic acid followed by butyric and palmitic acids. The high content of short-chain fatty acids is outstanding, specially that of butyric acid. 相似文献