全文获取类型
收费全文 | 1428篇 |
免费 | 48篇 |
专业分类
电工技术 | 25篇 |
综合类 | 6篇 |
化学工业 | 274篇 |
金属工艺 | 17篇 |
机械仪表 | 19篇 |
建筑科学 | 89篇 |
矿业工程 | 6篇 |
能源动力 | 34篇 |
轻工业 | 184篇 |
水利工程 | 3篇 |
石油天然气 | 3篇 |
无线电 | 146篇 |
一般工业技术 | 154篇 |
冶金工业 | 389篇 |
原子能技术 | 25篇 |
自动化技术 | 102篇 |
出版年
2022年 | 14篇 |
2021年 | 29篇 |
2020年 | 20篇 |
2019年 | 21篇 |
2018年 | 22篇 |
2017年 | 29篇 |
2016年 | 20篇 |
2015年 | 24篇 |
2014年 | 34篇 |
2013年 | 48篇 |
2012年 | 42篇 |
2011年 | 69篇 |
2010年 | 41篇 |
2009年 | 47篇 |
2008年 | 55篇 |
2007年 | 55篇 |
2006年 | 54篇 |
2005年 | 39篇 |
2004年 | 43篇 |
2003年 | 27篇 |
2002年 | 43篇 |
2001年 | 25篇 |
2000年 | 26篇 |
1999年 | 32篇 |
1998年 | 95篇 |
1997年 | 81篇 |
1996年 | 43篇 |
1995年 | 45篇 |
1994年 | 30篇 |
1993年 | 25篇 |
1992年 | 20篇 |
1991年 | 19篇 |
1990年 | 16篇 |
1989年 | 21篇 |
1988年 | 12篇 |
1987年 | 12篇 |
1986年 | 22篇 |
1985年 | 17篇 |
1984年 | 10篇 |
1983年 | 12篇 |
1982年 | 7篇 |
1981年 | 12篇 |
1980年 | 8篇 |
1979年 | 7篇 |
1978年 | 10篇 |
1977年 | 12篇 |
1976年 | 19篇 |
1975年 | 10篇 |
1974年 | 6篇 |
1970年 | 7篇 |
排序方式: 共有1476条查询结果,搜索用时 15 毫秒
51.
52.
Co, Co–Mn (67:33 at.%) and Co–Cu (67:33 at.%) coatings were fabricated using magnetron sputtering on two kinds of ferritic stainless steels (Crofer22APU and F17TNb) in order to form spinel protective coatings on metallic interconnects for solid oxide fuel cells. Despite the thickness unevenness at different regions, dense metallic coatings were successfully applied onto all necessary surfaces of the channelled interconnect substrates. Upon oxidation, spinel oxide coatings with very low Cr content were formed, reducing effectively the Cr release. Among the three protective coatings, Co–Cu coating showed the lowest area specific resistance (<15 mΩ cm2 at 800 °C). 相似文献
53.
Carl T. Haas Ana Maria Rodriguez Robert Glover Paul M. Goodrum 《Construction Management & Economics》2013,31(6):633-641
Recent studies show the construction industry in the USA is facing a long term labour shortage. Multiskilling has been suggested as a strategy to address this issue by utilizing existing workers more efficiently. Multiskilling decreases the number of workers hired for a project and can improve productivity. Additional benefits include higher income and increased employability of the workforce. To take full advantage of these benefits, the workforce strategy and the planning and scheduling processes of a construction project must be adapted to use multiskilling effectively and efficiently. The multiskilled workforce should be scheduled and organized to maximize the duration of employment for workers, reduce the overall labour requirements and cover the skills combinations required by the project. This research synthesizes and formalizes the methods that successful construction companies are currently applying to implement a multiskilled workforce. A methodology for implementing multiskilling is outlined as well. 相似文献
54.
55.
56.
Rosa Taurino Elena Fabbri Doris Pospiech Alla Synytska Massimo Messori 《Progress in Organic Coatings》2014
Organic–inorganic hybrid coatings on glass substrates with superhydrophobic properties and with improved scratch resistance were obtained by means of applying a multilayer approach including multiple sol–gel processes. The coatings exhibited a water contact angle (WCA) higher than 150°. Ultraviolet (UV)-curable vinyl ester resins and vinyltriethoxysilane (VTEOS) as coupling agent were employed to increase the adhesion between substrate and the inorganic layers. The surfaces were characterized by means of dynamic contact angle and roughness measurements. Indeed, the occurrence of superhydrophobic behavior was observed. The scratch resistance of the hybrid coatings was tested to evaluate the adhesion of the coatings to the glass substrate. The proposed preparation method for scratch resistant, mechanically stable, superhydrophobic coatings is simple and can be applied on large areas of different kinds of substrates. 相似文献
57.
58.
Maria Mytiliniou Joeri A. J. Wondergem Thomas Schmidt Doris Heinrich 《Journal of the Royal Society Interface》2022,19(187)
Intracellular transport is pivotal for cell growth and survival. Malfunctions in this process have been associated with devastating neurodegenerative diseases, highlighting the need for a deeper understanding of the mechanisms involved. Here, we use an experimental methodology that leads neurites of differentiated PC12 cells into either one of two configurations: a one-dimensional configuration, where the neurites align along lines, or a two-dimensional configuration, where the neurites adopt a random orientation and shape on a flat substrate. We subsequently monitored the motion of functional organelles, the lysosomes, inside the neurites. Implementing a time-resolved analysis of the mean-squared displacement, we quantitatively characterized distinct motion modes of the lysosomes. Our results indicate that neurite alignment gives rise to faster diffusive and super-diffusive lysosomal motion than the situation in which the neurites are randomly oriented. After inducing lysosome swelling through an osmotic challenge by sucrose, we confirmed the predicted slowdown in diffusive mobility. Surprisingly, we found that the swelling-induced mobility change affected each of the (sub-/super-)diffusive motion modes differently and depended on the alignment configuration of the neurites. Our findings imply that intracellular transport is significantly and robustly dependent on cell morphology, which might in part be controlled by the extracellular matrix. 相似文献
59.
Delphine Vincent AnhDuyen Bui Doris Ram Vilnis Ezernieks Frank Bedon Joe Panozzo Pankaj Maharjan Simone Rochfort Hans Daetwyler Matthew Hayden 《International journal of molecular sciences》2022,23(2)
Bread wheat is the most widely cultivated crop worldwide, used in the production of food products and a feed source for animals. Selection tools that can be applied early in the breeding cycle are needed to accelerate genetic gain for increased wheat production while maintaining or improving grain quality if demand from human population growth is to be fulfilled. Proteomics screening assays of wheat flour can assist breeders to select the best performing breeding lines and discard the worst lines. In this study, we optimised a robust LC–MS shotgun quantitative proteomics method to screen thousands of wheat genotypes. Using 6 cultivars and 4 replicates, we tested 3 resuspension ratios (50, 25, and 17 µL/mg), 2 extraction buffers (with urea or guanidine-hydrochloride), 3 sets of proteases (chymotrypsin, Glu-C, and trypsin/Lys-C), and multiple LC settings. Protein identifications by LC–MS/MS were used to select the best parameters. A total 8738 wheat proteins were identified. The best method was validated on an independent set of 96 cultivars and peptides quantities were normalised using sample weights, an internal standard, and quality controls. Data mining tools found particularly useful to explore the flour proteome are presented (UniProt Retrieve/ID mapping tool, KEGG, AgriGO, REVIGO, and Pathway Tools). 相似文献
60.
Mende S Krzyzanowski L Weber J Jaros D Rohm H 《Journal of Bioscience and Bioengineering》2012,113(2):185-191
Some Lactobacillus delbrueckii ssp. bulgaricus strains are able to synthesize exopolysaccharides (EPS) and are therefore highly important for the dairy industry as starter cultures. The aim of this study was to investigate the nutritional requirements for growth and EPS production of Lactobacillus delbrueckii ssp. bulgaricus DSM 20081. A medium was developed from a semi-defined medium (SDM) in which glucose was replaced by lactose and different combinations of supplements (nucleobases, vitamins, salts, sodium formate and orotic acid) were added. Constant pH batch fermentation with the modified medium resulted in an EPS yield of approximately 210 mg glucose equivalents per liter medium. This was a 10-fold increase over flask cultivation of this strain in SDM. Although not affecting cell growth, the mixture of salts enhanced the EPS synthesis. Whereas EPS production was approximately 12 mg/g dry biomass without salt supplementation, a significantly higher yield (approximately 20 mg/g dry biomass) was observed after adding the salt mixture. In continuous fermentation, a maximal EPS concentration was obtained at a dilution rate of 0.31/h (80 mg EPS/L), which corresponded to a specific EPS production of 49 mg/g dry biomass. 相似文献