全文获取类型
收费全文 | 650篇 |
免费 | 76篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 272篇 |
金属工艺 | 8篇 |
机械仪表 | 13篇 |
建筑科学 | 27篇 |
能源动力 | 20篇 |
轻工业 | 169篇 |
水利工程 | 4篇 |
石油天然气 | 2篇 |
无线电 | 31篇 |
一般工业技术 | 94篇 |
冶金工业 | 8篇 |
自动化技术 | 76篇 |
出版年
2024年 | 2篇 |
2023年 | 19篇 |
2022年 | 7篇 |
2021年 | 99篇 |
2020年 | 37篇 |
2019年 | 28篇 |
2018年 | 42篇 |
2017年 | 27篇 |
2016年 | 44篇 |
2015年 | 30篇 |
2014年 | 34篇 |
2013年 | 57篇 |
2012年 | 36篇 |
2011年 | 58篇 |
2010年 | 32篇 |
2009年 | 34篇 |
2008年 | 30篇 |
2007年 | 18篇 |
2006年 | 21篇 |
2005年 | 9篇 |
2004年 | 11篇 |
2003年 | 13篇 |
2002年 | 8篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 8篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1985年 | 2篇 |
1980年 | 1篇 |
排序方式: 共有726条查询结果,搜索用时 302 毫秒
71.
72.
Application of amaranth protein isolate and hydrolysate on a reduced salt fish restructured product: antioxidant properties,textural and microbiological effects 下载免费PDF全文
Susan F. García Fillería Valeria A. Tironi 《International Journal of Food Science & Technology》2015,50(6):1452-1460
This work evaluates amaranth protein ingredients [isolate (I) and alcalase‐hydrolysate (H)] acting as antioxidants and binders in restructured fish products. Gel products were obtained after thermal treatment (40 °C, 30 min; 90 °C, 30 min) of different formulations from fish muscle pastes, where salt (2%) was partially or totally replaced by I or H. Antioxidant activity was assessed by conjugated dienes and thiobarbituric acid‐reactive substances (TBARs) measurements during the chilled storage. Textural properties, water‐holding capacity, colour and microbiological quality were evaluated. Reduced‐salt content products containing 2% w/w of I or H partially inhibited lipid oxidation especially at the level of the decomposition of hydroperoxides into secondary products, due to about 50% and 60% of inhibition of TBARs, respectively, was registered. Also, these products showed acceptable microbiological quality and technological characteristics with only minimal changes in properties as gel hardness and colour parameters compared with control products (2% w/w salt). 相似文献
73.
74.
75.
76.
The selective oxidation of alkane and olefin moieties are reactions of fundamental importance in both chemical synthesis and biology. Nature efficiently catalyzes the oxidation of hydrocarbons using iron-dependent enzymes, which operate through the mediation of oxoiron(IV) or oxoiron(V) species. In the quest for chemo, regio and stereoselective transformations akin to those taking place in nature, bioinspired iron catalysts have been developed and understanding their mechanism of action has become a particularly relevant area of research. While a prominent advance in the preparation and characterization of oxoiron(IV) species has been accomplished, oxoiron(V) species remain exceedingly rare, presumably because the high reactivity that makes them particularly interesting also makes them difficult to observe. This review summarizes the advances in the field, focusing in synthetic systems for which the oxoiron(V) species relevant in these transformations have been directly detected and spetroscopically characterized. 相似文献
77.
Pham Van Quyet Bernice Mei Jin Tan Celine Valeria Liew Lai Wah Chan Quan Sing Ng 《Drug development and industrial pharmacy》2018,44(4):624-631
L-NG-nitroarginine (LNNA), an analog of L-arginine, is a competitive inhibitor of nitric oxide synthase which causes the selective reduction of blood flow to tumor cells. Despite the potential of LNNA to function as an adjuvant in cancer therapies, its poor solubility and stability have hindered the development of an injectable formulation of LNNA that is suitable for human administration. This work, for the first time, details a systematic study on the determination of equilibrium Ka constants and the rate law of LNNA degradation. The four Ka values of LNNA were determined to be 1.03, 1.10?×?10?2, 2.51?×?10?10, and 1.33?×?10?13 M. From the kinetic and equilibrium studies, we have shown that the deprotonated form of LNNA is the main form of LNNA that undergoes degradation in aqueous media at room temperature. The rate law of LNNA degradation was found to be first order with respect to OH? concentration and first order with respect to LNNA? concentration. The rate constant at 25?°C and 1?atm was determined to be 0.04453 M?1min?1. A base catalyzed mechanism of LNNA degradation was proposed based on the kinetic study. The mechanism was found to be very useful in explaining the discrepancies and changes of the rate law at different pH values. It is thus recommended that LNNA should be formulated as a concentrated solution in acidic conditions for maximum chemical stability during storage and be diluted with a basic solution to near physiological pH just before administration. 相似文献
78.
Johanna Lieb Valeria Demontis Domenic Prete Daniele Ercolani Valentina Zannier Lucia Sorba Shimpei Ono Fabio Beltram Benjamin Sacp Francesco Rossella 《Advanced functional materials》2019,29(3)
Here, the operation of a field‐effect transistor based on a single InAs nanowire gated by an ionic liquid is reported. Liquid gating yields very efficient carrier modulation with a transconductance value 30 times larger than standard back gating with the SiO2/Si++ substrate. Thanks to this wide modulation, the controlled evolution from semiconductor to metallic‐like behavior in the nanowire is shown. This work provides the first systematic study of ionic‐liquid gating in electronic devices based on individual III–V semiconductor nanowires: this architecture opens the way to a wide range of fundamental and applied studies from the phase transitions to bioelectronics. 相似文献
79.
Hannah C. Nerl Anuj Pokle Lewys Jones Knut Müller‐Caspary Karel H. W. van den Bos Clive Downing Eoin K. McCarthy Nicolas Gauquelin Quentin M. Ramasse Ivan Lobato Dermot Daly Juan Carlos Idrobo Sandra Van Aert Gustaaf Van Tendeloo Stefano Sanvito Jonathan N. Coleman Clotilde S. Cucinotta Valeria Nicolosi 《Advanced functional materials》2019,29(37)
The fabrication of 2D systems for electronic devices is not straightforward, with top‐down low‐yield methods often employed leading to irregular nanostructures and lower quality devices. Here, a simple and reproducible method to trigger self‐assembly of arrays of high aspect‐ratio chiral copper heterostructures templated by the structural anisotropy in black phosphorus (BP) nanosheets is presented. Using quantitative atomic resolution aberration‐corrected scanning transmission electron microscopy imaging, in situ heating transmission electron microscopy and electron energy‐loss spectroscopy arrays of heterostructures forming at speeds exceeding 100 nm s?1 and displaying long‐range order over micrometers are observed. The controlled instigation of the self‐assembly of the Cu heterostructures embedded in BP is achieved using conventional electron beam lithography combined with site specific placement of Cu nanoparticles. Density functional theory calculations are used to investigate the atomic structure and suggest a metallic nature of the Cu heterostructures grown in BP. The findings of this new hybrid material with unique dimensionality, chirality, and metallic nature and its triggered self‐assembly open new and exciting opportunities for next generation, self‐assembling devices. 相似文献
80.
Murgulov Valeria Schweinle Catherine Daub Michael Hillebrecht Harald Fiederle Michael Dědič Václav Franc Jan 《Journal of Materials Science》2022,57(4):2758-2774
Journal of Materials Science - Single crystals of lead-free halide double perovskite Cs2AgBiBr6 sensor material manifest a remarkable potential for application in radiation detection and imaging.... 相似文献