全文获取类型
收费全文 | 2811篇 |
免费 | 244篇 |
国内免费 | 3篇 |
学科分类
工业技术 | 3058篇 |
出版年
2023年 | 17篇 |
2022年 | 23篇 |
2021年 | 96篇 |
2020年 | 56篇 |
2019年 | 80篇 |
2018年 | 132篇 |
2017年 | 138篇 |
2016年 | 114篇 |
2015年 | 112篇 |
2014年 | 128篇 |
2013年 | 220篇 |
2012年 | 160篇 |
2011年 | 205篇 |
2010年 | 132篇 |
2009年 | 124篇 |
2008年 | 132篇 |
2007年 | 136篇 |
2006年 | 75篇 |
2005年 | 74篇 |
2004年 | 71篇 |
2003年 | 61篇 |
2002年 | 42篇 |
2001年 | 37篇 |
2000年 | 32篇 |
1999年 | 38篇 |
1998年 | 175篇 |
1997年 | 116篇 |
1996年 | 69篇 |
1995年 | 39篇 |
1994年 | 42篇 |
1993年 | 31篇 |
1992年 | 11篇 |
1991年 | 16篇 |
1990年 | 11篇 |
1989年 | 11篇 |
1988年 | 12篇 |
1987年 | 12篇 |
1986年 | 9篇 |
1985年 | 6篇 |
1984年 | 7篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1977年 | 5篇 |
1976年 | 19篇 |
1975年 | 3篇 |
1973年 | 3篇 |
排序方式: 共有3058条查询结果,搜索用时 15 毫秒
1.
Policicchio Alfonso Putz Ana-Maria Conte Giuseppe Stelitano Sara Bonaventura Carlo Poselle Ianăşi Cătălin Almásy László Wacha András Horváth Zsolt Endre Agostino Raffaele G. 《Journal of Porous Materials》2021,28(4):1049-1058
Journal of Porous Materials - The present study reports a systematic analysis of morphology and hydrogen sorption capacity of mesoporous organic-inorganic silica prepared by varying the silica... 相似文献
2.
Elise Laszlo Gregory De Crescenzo Alfonso Nieto-Argüello Xavier Banquy Davide Brambilla 《Advanced functional materials》2021,31(46):2106061
The noninvasive sampling of dermal interstitial fluid (ISF) for the monitoring of clinical biomarkers is a greatly appealing area of research. The identification of molecular biomarkers in biological fluids has been accelerated with -omics analyses but remains limited in ISF because of its time-consuming and complex extraction process. Here, the generation of microneedle (MN) patches made of superabsorbent acrylate-based hydrogels for the rapid sampling of dermal ISF is described to explore its proteome. In depth, iterative optimization allows the identification of novel acrylate-based compositions with the required chemical, mechanical, and biocompatibility properties allowing proteomic analysis of the extracted ISF for the first time after sampling with swelling MNs. The generated MN arrays show no cytotoxic effect, successfully cross the stratum corneum, and can collect up to 6 µL of dermal ISF in 10 min in vivo. Proteomics lead to the detection of 176 clinically relevant biomarkers in the collected samples validating the use of ISF as a relevant bodily fluid for disease monitoring and diagnostic. Importantly, it is discovered that extraction fingerprint is strongly dependent on the MNs chemistry, and thus specific biomarkers could be selectively extracted by tuning the composition of the patch, making the system versatile and specific. 相似文献
3.
4.
Minds and Machines - In the last 20 years the Turing test has been left further behind by new developments in artificial intelligence. At the same time, however, these developments have revived... 相似文献
5.
Concentration of Gamma‐Linolenic and Stearidonic Acids as Free Fatty Acids and Ethyl Esters from Viper's Bugloss Seed Oil by Urea Complexation 下载免费PDF全文
6.
Antonio Buonerba Francesco Della Monica Vito Speranza Carmine Capacchione Stefano Milione Alfonso Grassi 《Polymer International》2019,68(10):1681-1687
The thin‐film morphology of stereoregular syndiotactic poly(p‐methylstyrene)–(cis‐1,4‐polybutadiene) (sP(pMS–B)) multiblock copolymers has been investigated using tapping mode atomic force microscopy with variation of the polymer composition and monomer block lengths. The morphology of the thin films ranges from isolated circular domains of sP(pMS) embedded into a matrix of polybutadiene (PB) to isolated domains of PB embedded into a matrix of sP(pMS), passing through bicontinuous (jagged) lamellae when the pMS concentration is in the range 20–67 mol%. Multiple folding of the polymer segments, i.e. where reciprocal inclusions of polymer segments to each other phase are able to generate greater domain, has been postulated and validated by considerations on the polymer architecture and the thermal and crystalline behaviour. © 2019 Society of Chemical Industry 相似文献
7.
8.
9.
M.A. Ruiz Martínez S. Peralta Galisteo H. Castán M.E. Morales Hernández 《International journal of cosmetic science》2020,42(6):529-535
This work analyses the role of proteoglycans on skin ageing, influenced by the presence of glycosylated proteins, which exercise diverse functions on the skin. They are essential components that restore the cells, providing hydration, maintaining hydration of the extracellular matrix, preventing the formation of wrinkles thanks to their ability to combine to other molecules such as collagen or hyaluronic acid and favouring the smoothness of the skin texture. The use of these proteins is a very recent and promising topic, since their application may revolutionize skin ageing therapies. Of the existing proteoglycans, decorin, versican and perlecan are of special note, playing a fundamental role on skin. 相似文献
10.
This article presents nanohardness, coefficient of friction (COF), and wear of Yttria-stabilized zirconia coatings (YSZ) deposited on 316L steel substrates and co-deposited with Al and Ag. YSZ coatings were deposited via RF sputtering reactive phase technique. It is widely known that the RF sputtering technique produces stoichiometric coatings with high homogeneity and density. The average thickness of the coatings was 200 nm, and the X-ray diffraction study (XRD) showed the formation of alumina alpha (α-Al2O3) and metallic silver in the YSZ coatings deposited with Al and Ag, respectively. The mechanical properties were evaluated by means of nanoindentation, and the wear resistance was studied with pin-on-disk technique. The addition of Ag to the YSZ coatings led to decreased hardness, while the YSZ coatings deposited with Al presented an increased hardness. Finally, YSZ coatings deposited with aluminum and silver had the lowest friction coefficient, while Ag-YSZ coatings had a COF very similar to that obtained in YSZ coatings. The wear resistance test showed that YSZ coatings deposited with Al had lower volume loss compared to YSZ coatings deposited with Ag. The wear mechanism in the deposited coatings is analyzed. 相似文献