全文获取类型
收费全文 | 134篇 |
免费 | 9篇 |
专业分类
综合类 | 1篇 |
化学工业 | 44篇 |
金属工艺 | 4篇 |
机械仪表 | 5篇 |
矿业工程 | 1篇 |
能源动力 | 17篇 |
轻工业 | 5篇 |
无线电 | 12篇 |
一般工业技术 | 19篇 |
冶金工业 | 1篇 |
自动化技术 | 34篇 |
出版年
2024年 | 2篇 |
2023年 | 2篇 |
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 3篇 |
2019年 | 6篇 |
2018年 | 7篇 |
2017年 | 8篇 |
2016年 | 5篇 |
2015年 | 2篇 |
2014年 | 9篇 |
2013年 | 15篇 |
2012年 | 15篇 |
2011年 | 10篇 |
2010年 | 3篇 |
2009年 | 7篇 |
2008年 | 8篇 |
2007年 | 8篇 |
2006年 | 6篇 |
2005年 | 5篇 |
2004年 | 7篇 |
2003年 | 3篇 |
2002年 | 3篇 |
1997年 | 1篇 |
1983年 | 1篇 |
排序方式: 共有143条查询结果,搜索用时 761 毫秒
141.
Bo Chen Sijiang Chen Harshad A. Bandal Richard Appiah-Ntiamoah Amol R. Jadhav Hern Kim 《International Journal of Hydrogen Energy》2018,43(19):9296-9306
A novel recyclable cobalt nanocatalyst, supported on magnetic carbon with core-shell structure, was successfully synthesized by using wetness impregnation-chemical reduction method for hydrogen generation from hydrolysis of NaBH4. The resultant nanocomposite was characterized to determine the structural and physical-chemical properties by a series of analytical techniques such as FT-IR (Fourier transform infrared spectroscopy), XRD (X-ray diffraction), SEM (scanning electron microscope), EDX (energy-dispersive X-ray spectroscopy), TEM (transmission electron microscopy), etc. The results demonstrated that amorphous cobalt nanoparticles were homogeneously surrounded on the surface of the support due to having abundant hydrophilic groups (such as aldehyde and hydroxyl groups) on the surface of carbon layer for the effective immobilization of metal ions. The supported catalyst showed superior catalytic performance towards the hydrolysis reaction of NaBH4 at room temperature. The total rate of hydrogen generation and activation energy were calculated to be 1403 ml H2 gcat?1 min?1 and 49.2 kJ mol?1, respectively, which were comparable to the values of most cobalt-based catalyst reported for hydrogen production from hydrolysis of NaBH4. Additionally, reusability test revealed that the hydrogen in NaBH4 substrate could be completely released within 25 min with a minimum hydrogen generation rate of 832 ml H2 gcat?1 min?1 even after five runs of hydrolytic reaction, implying the as-prepared Co/Fe3O4@C composite could be considered as a promising candidate catalyst for portable hydrogen fuel system such as PEMFC (proton exchange membrane fuel cells). 相似文献
142.
Samuel Jayaraj Richard Prabakar Amol Bhairuba Ikhe Woon-Bae Park Docheon Ahn Kee-Sun Sohn Myoungho Pyo 《Advanced functional materials》2023,33(29):2301399
Crystalline water-free β-phase Ca0.14V2O5 is reported for the first time as a viable cathode material for calcium-ion batteries (CIBs). In contrast to layered α-V2O5 and δ-CaxV2O5·nH2O, which have limited capacity, the β-phase delivers a reversible capacity of ≈247 mAh g−1, which corresponds to the insertion/extraction of Ca2+ between Ca0.14V2O5 and Ca1.0V2O5. The process of Ca2+ insertion process and the accompanying structural relaxation are theoretically and experimentally verified. The initial insertion of Ca2+ into Ca0.14V2O5 causes a slight shift of oxygen atoms surrounding hepta-coordination sites, creating penta-coordinated sites that are then partially filled up to Ca0.33V2O5. Further insertion occurs through the stepwise occupation of up to 50% of neighboring hexa- and tetra-coordination sites to form Ca0.67V2O5 and Ca1.0V2O5, respectively. The rearrangement of oxygen atoms in Ca0.14V2O5 also minimizes dimensional changes, leading to high cyclic stability during repeated charge/discharge cycles. The remarkable electrochemical performance of full cells containing a Ca0.14V2O5 cathode and a K metal anode in Ca2+/K+ hybrid electrolytes, is also demonstrated, thanks to the inertness of K+ insertion into Ca0.14V2O5 and the absence of calcium plating/stripping. The cyclic stability and high capacity of Ca0.14V2O5 is not compromised in hybrid electrolytes, making it a viable CIB cathode. 相似文献
143.
Antonysamy Dennyson Savariraj Chellan Justin Raj Amol Marotrao Kale Byung Chul Kim 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(20):2207713
Among several electrocatalysts for energy storage purposes including supercapacitors, metal–organic frameworks (MOFs), and their derivatives have spurred wide spread interest owing to their structural merits, multifariousness with tailor-made functionalities and tunable pore sizes. The electrochemical performance of supercapacitors can be further enhanced using in situ grown MOFs and their derivatives, eliminating the role of insulating binders whose “dead mass” contribution hampers the device capability otherwise. The expulsion of binders not only ensures better adhesion of catalyst material with the current collector but also facilitates the transport of electron and electrolyte ions and remedy cycle performance deterioration with better chemical stability. This review systematically summarizes different kinds of metal–ligand combinations for in situ grown MOFs and derivatives, preparation techniques, modification strategies, properties, and charge transport mechanisms as freestanding electrode materials in determining the performance of supercapacitors. In the end, the review also highlights potential promises, challenges, and state-of-the-art advancement in the rational design of electrodes to overcome the bottlenecks and to improve the capability of MOFs in energy storage applications. 相似文献