全文获取类型
收费全文 | 183篇 |
免费 | 22篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 3篇 |
化学工业 | 27篇 |
金属工艺 | 3篇 |
机械仪表 | 3篇 |
建筑科学 | 7篇 |
能源动力 | 16篇 |
轻工业 | 23篇 |
水利工程 | 2篇 |
无线电 | 24篇 |
一般工业技术 | 53篇 |
冶金工业 | 3篇 |
自动化技术 | 45篇 |
出版年
2024年 | 2篇 |
2023年 | 6篇 |
2022年 | 19篇 |
2021年 | 15篇 |
2020年 | 20篇 |
2019年 | 20篇 |
2018年 | 24篇 |
2017年 | 12篇 |
2016年 | 13篇 |
2015年 | 7篇 |
2014年 | 9篇 |
2013年 | 10篇 |
2012年 | 9篇 |
2011年 | 15篇 |
2010年 | 8篇 |
2009年 | 8篇 |
2008年 | 4篇 |
2007年 | 4篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2004年 | 2篇 |
排序方式: 共有209条查询结果,搜索用时 15 毫秒
31.
Viney Ghai Harpreet Singh Bedi Jasdeep Bhinder Ankit Chauhan 《Fullerenes, Nanotubes and Carbon Nanostructures》2020,28(11):907-912
AbstractThe present study introduces a process to grow micro-honeycomb (µ-HC) vertically aligned carbon nanotubes (VACNTs) using thermal chemical vapor deposition technique. Methane is used as a source of carbon and hydrogen gas as a reducing agent. Where, the fabricated µ-HC structure reported in literature involves complex synthesis process and requires a catalyst layer, the novelty of the process used here lies in the fact that no catalyst layer is used for the growth of CNT network, rather copper foil is used as a substrate. The in-situ cracking of CNTs due to water treatment leads to the formation of µ-HC CNT network, which is confirmed by Raman spectroscopy. Further scanning electron microscopy analysis shows that the length of developed µ-HC CNT is ~5?µm. Hexagonal µ-HC network shows more than 94% absorption in UV-Vis-NIR wavelength region. The designed process provides high-yield with a low-cost synthesis of vertically aligned CNTs having 3?D microarchitecture. The fabricated CNT network can be used as an electrode for supercapacitor, as an active layer in a photovoltaic cell and most of the energy harvesting devices. 相似文献
32.
Xu Liu Philip Zimny Yuning Zhang Ankit Rana Roland Nagel Walter Reisner William B. Dunbar 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(3)
Solid‐state nanopores are a single‐molecule technique that can provide access to biomolecular information that is otherwise masked by ensemble averaging. A promising application uses pores and barcoding chemistries to map molecular motifs along single DNA molecules. Despite recent research breakthroughs, however, it remains challenging to overcome molecular noise to fully exploit single‐molecule data. Here, an active control technique termed “flossing” that uses a dual nanopore device is presented to trap a proteintagged DNA molecule and up to 100's of back‐and‐forth electrical scans of the molecule are performed in a few seconds. The protein motifs bound to 48.5 kb λ‐DNA are used as detectable features for active triggering of the bidirectional control. Molecular noise is suppressed by averaging the multiscan data to produce averaged intertag distance estimates that are comparable to their known values. Since nanopore feature‐mapping applications require DNA linearization when passing through the pore, a key advantage of flossing is that trans‐pore linearization is increased to >98% by the second scan, compared to 35% for single nanopore passage of the same set of molecules. In concert with barcoding methods, the dual‐pore flossing technique could enable genome mapping and structural variation applications, or mapping loci of epigenetic relevance. 相似文献
33.
We have developed films of pure polymethylmethacrylate (PMMA) (0.5, 1, 2 and 5%) and potassium permanganate \((\hbox {KMnO}_{4})\)-doped PMMA composite films of thickness (\(\sim 100\, \upmu \hbox {m}\)) using the solution-cast technique. To identify the possible change that happen to the PMMA films due to doping, the optical properties were investigated for different concentrations of \(\hbox {KMnO}_{4}\) by recording the absorbance (A) and transmittance (\(T\%\)) spectra of these films using UV–Vis spectrophotometer in the wavelength range of 300–1100 nm. From the data obtained from the optical parameters viz. absorption coefficient (\(\alpha \)), extinction coefficient (\(\kappa \)), finesse coefficient (F), refractive index (\(\eta \)), real and imaginary parts of dielectric constant (\(\varepsilon _{\mathrm{r}}\) and \(\varepsilon _{\mathrm{i}})\) and optical conductivity (\(\sigma \)) were calculated for the prepared films. The indirect optical band gap for the pure and the doped-PMMA films were also estimated. 相似文献
34.
Srivastava Ankit Anand Abhishek Shukla Amritanshu Kumar Anil Sharma Atul 《Clean Technologies and Environmental Policy》2022,24(9):2881-2898
Clean Technologies and Environmental Policy - Food product drying is used to keep food products preserved for a long period and reduce post-harvest losses. Many industries dealing with food drying... 相似文献
35.
Singh Ankit Pradeepkumar Maurya Sandeep Jarwal Deepak Kumar Jit Satyabrata Bysakh Sandip Ahmad Md. Imteyaz Basu Joysurya Mandal R. K. 《Journal of Materials Science》2021,56(28):16113-16133
Journal of Materials Science - Atomic arrangements in the nanostructured grains and interfaces of thermally evaporated Au/Cu multilayer thin films on polycrystalline Si substrate have been explored... 相似文献
36.
Effect of polymer composition on performance properties of maleate-vinyl ether donor-acceptor UV-curable systems 总被引:1,自引:0,他引:1
Neena Ravindran Ankit Vora Dean C. Webster 《Journal of Coatings Technology and Research》2006,3(3):213-219
The effect of unsaturated polyester backbone composition on the properties of donor-acceptor-UV-cured coatings was explored. The polyesters were designed with similar molecular weights and levels of unsaturation, but with otherwise widely varying backbone compositions. UV-curable coatings were formulated with stoichiometric levels of triethylenglycol divinyl ether and a photoinitiator. The resulting coatings had a broad range of properties, which were found to correlate with the properties and compositions of the polyester backbone polymers. A relatively flexible backbone resulted in lower glass transition temperatures (Tg). The polymer Tg was found to influence the conversion of double bonds achieved during UV curing. Reaction kinetics were evaluated for the coating systems and the results confirmed that the Tg of the systems influenced the double bond conversion. Thermal stability and König pendulum hardness were also found to vary with the backbone composition of the constituent polyester. 相似文献
37.
A Multi-Functional Single-Stage Power Electronic Interface for Plug-In Electric Vehicles Application
This paper proposes a Zeta-derived non-isolated single-stage power electronic interface for on-board application of plug-in electric vehicles, which provides all modes (plug-in charging, propulsion, and regenerative braking) of vehicle operation. In addition, the proposed converter can charge the battery through universal input voltage range, i.e., 90–260 V due to buck/boost operations in plug-in charging mode. In propulsion and regenerative braking modes, the proposed converter operates as conventional boost and buck DC/DC converter, respectively. Compared to existing single-stage converters, the proposed converter has least components to those converters which have buck/boost operation in plug-in charging mode. A voltage/current stresses and loss analysis of the converter have been investigated for each mode of converter operation. Detailed simulation and experimental results are given to show the effectiveness of the proposed converter. 相似文献
38.
39.
Ankit Garg Sanandam Bordoloi Somnath Mondal S Sreedeep 《Journal of Natural Fibers》2020,17(5):650-664
ABSTRACTThis study investigates and compares mechanical factor (a dimensionless parameter and defined as the ratio of the compressive strength of fiber reinforced soil to that of unreinforced soil) for soils reinforced with four different fibers (three natural fibers and one synthetic fiber). An integrated methodology was utilized, including 351 laboratory experiments for obtaining data and Extreme Learning Machine (ELM) technique for developing functional relationships between mechanical factor and soil and fiber parameters. Soils reinforced with synthetic fiber (Polypropylene) and with natural fibers exhibited different characteristics when subjected to the same variation in soil parameters. This phenomenon can be attributed to the differences in surface morphology and water absorption capability of Polypropylene comparative to other natural fibers. Polypropylene–soil composite shows the maximum sensitivity to the soil moisture. It also shows the least sensitivity toward soil density and fiber content among all tested fiber–soil composites. 相似文献
40.
Complete liquification time test coupled with solvent fractionation technique to detect adulteration of foreign fats in ghee
下载免费PDF全文
![点击此处可从《International Journal of Dairy Technology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Neelam Upadhyay Anil Kumar Ankit Goyal Darshan Lal 《International Journal of Dairy Technology》2017,70(1):110-118
Complete liquification time (CLT) test (min:s) exploits the physical property of milk fat as the time required by solid fat to melt completely at a defined temperature. It has been used to detect adulteration of groundnut oil and goat body fat when added singly and in combination with ghee. The Complete liquification time test for samples containing a combination of adulterants was carried out before and after solvent fractionation. The results revealed that adulterants added individually could be detected at higher levels (15%, w/w, groundnut oil in cow ghee; and 10%, w/w, goat body fat in buffalo ghee), while fractionation reduced the detection limit to lowest level (10%, w/w) used in this study. 相似文献