全文获取类型
收费全文 | 340篇 |
免费 | 12篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 75篇 |
金属工艺 | 5篇 |
机械仪表 | 11篇 |
建筑科学 | 10篇 |
能源动力 | 12篇 |
轻工业 | 34篇 |
水利工程 | 1篇 |
石油天然气 | 1篇 |
无线电 | 39篇 |
一般工业技术 | 84篇 |
冶金工业 | 12篇 |
原子能技术 | 5篇 |
自动化技术 | 64篇 |
出版年
2024年 | 1篇 |
2023年 | 11篇 |
2022年 | 18篇 |
2021年 | 37篇 |
2020年 | 21篇 |
2019年 | 38篇 |
2018年 | 32篇 |
2017年 | 14篇 |
2016年 | 11篇 |
2015年 | 7篇 |
2014年 | 13篇 |
2013年 | 34篇 |
2012年 | 14篇 |
2011年 | 15篇 |
2010年 | 7篇 |
2009年 | 3篇 |
2008年 | 6篇 |
2007年 | 6篇 |
2006年 | 3篇 |
2005年 | 2篇 |
2004年 | 5篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 5篇 |
1998年 | 8篇 |
1997年 | 3篇 |
1996年 | 5篇 |
1995年 | 2篇 |
1993年 | 1篇 |
1992年 | 7篇 |
1991年 | 3篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
排序方式: 共有355条查询结果,搜索用时 0 毫秒
21.
22.
Joselito P. Labis Anwar Q. Al-Anazi Hamad A. Al-Brithen Mahmoud Hezam Mohammad Abdulaziz Alduraibi Ahmad Algarni Abdulaziz A. Alharbi Abdulrhman S. Al-Awadi Aslam Khan Ahmed Mohamed El-Toni 《Journal of the American Ceramic Society》2019,102(7):4367-4375
In this study, pulsed laser ablation technique, also known as pulsed laser deposition (PLD), is used to design and grow zinc oxide (ZnO) nanostructures (nanoworms, nanowalls, and nanorods) by template/seeding approach for gas-sensing applications. Conventionally, ZnO nanostructures used for gas-sensing have been usually prepared via chemical route, where the 3D/2D nanostructures are chemically synthesized and subsequently plated on an appropriate substrate. However, using pulsed laser ablation technique, the ZnO nanostructures are structurally designed and grown directly on a substrate using a two-step temperature-pressure seeding approach. This approach has been optimized to design various ZnO nanostructures by understanding the effect of substrate temperature in the 300-750°C range under O2 gas pressure from 10-mTorr to 10 Torr. Using a thin ZnO seed layer as template that is deposited first at substrate temperature of ~300°C at background oxygen pressure of 10 mTorr on Si(100), ZnO nanostructures, such as nanoworms, nanowalls, and nanorods (with secondary flower-like growth) were grown at substrate temperatures and oxygen background pressures of (550°C and 2 Torr), (550°C and 0.5 Torr), and (650°C and 2 Torr), respectively. The morphology and the optical properties of ZnO nanostructures were examined by Scanning Electron Microscope (SEM-EDX), X-ray Diffraction (XRD), and photoluminescence (PL). The PLD-grown ZnO nanostructures are single-crystals and are highly oriented in the c-axis. The vapor-solid (VS) model is proposed to be responsible for the growth of ZnO nanostructures by PLD process. Furthermore, the ZnO nanowall structure is a very promising nanostructure due to its very high surface-to-volume ratio. Although ZnO nanowalls have been grown by other methods for sensor application, to this date, only a very few ZnO nanowalls have been grown by PLD for this purpose. In this regard, ZnO nanowall structures are deposited by PLD on an Al2O3 test sensor and assessed for their responses to CO and ethanol gases at 50 ppm, where good responses were observed at 350 and 400°C, respectively. The PLD-grown ZnO nanostructures are very excellent materials for potential applications such as in dye-sensitized solar cells, perovskite solar cells and biological and gas sensors. 相似文献
23.
Magnetic nanoparticles have emerged as an important class of functional nanostructures with potential applications of magnetic resonance imaging, drug targeting, and bio-conjugation. We have developed a modified sol–gel approach to synthesize stable and well-dispersed magnetic Co@SiO2 nanoparticles with improved control over shell thickness and larger core diameters. These well-defined Co@SiO2 core–shell nanoparticles exhibit useful magnetic properties, and the protective silica shell allows them to be surface modified for bioconjugation for various biomedical applications. The core–shell nanoparticles were characterized by transmission electron microscopy, energy-dispersive spectroscopy, elemental mapping, and the line compositional analyses to demonstrate that uniform individually isolated core–shell nanoparticles are obtained through the improved synthetic route. 相似文献
24.
The life of a component subjected to a constant stress can be determined using the S-N diagram. Prediction of cumulative fatigue damage or fatigue life of a component subjected to a given stress sequence of varying
amplitude is difficult, if not impossible. Miner's rule and Kramer's equation can predict cumulative fatigue damage with a
reasonable degree of accuracy for limited cases. The development of Kramer's equation was studied and a modification suggested.
Cumulative fatigue data generated using aluminium alloys 2011-T3 and 2024-T4, were analysed using Miner's, Kramer's and the
modified equations. While Miner's rules and Kramer's equation predict cumulative fatigue damage with tolerable error for a
few cases, the modified equation has shown close agreement between the experimental and theoretical values of fatigue life
or cumulative fatigue damage for the materials studied in this investigation. 相似文献
25.
Bukhari Muhammad Adnan Ahmad Zahoor Ashraf M. Yasin Afzal Muhammad Nawaz Fahim Nafees Muhammad Jatoi Wajid Nasim Malghani Naveed Aslam Shah Adnan Noor Manan Abdul 《SILICON》2021,13(12):4757-4772
Silicon - Feeling prone to stress differs with plant production stage, water scarcity near commencement of grain filling phase has a significant reduced grain yield through fewer endosperm and sink... 相似文献
26.
Aslam Hossain M. S. Meera E. A. Mukhanova A. V. Soldatov A. M. A. Henaish Jahangeer Ahmed Yuanbing Mao S. M. A. Shibli 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(26):2300492
The design of water-stable photo and electrocatalysts of metal–organic frameworks (MOFs) for its promising catalytic applications at long-term irradiations or persisted current loads is extremely necessary but still remains as challenging. A limited number of reports on Ti-MOF-based catalysts for water splitting are only available to explain and understand the correlation between the nature of materials and MOFs array. Herein, spherical Ti-MOFs and corresponding partially annealed hollow core–shell Ti-MOFs (Ti-MOF/D) are designed and the correlation with their photo(electro)catalytic water splitting performance is evaluated. The switchable valence state of Ti for the Ti-MOF as a function of molecular bonding is the possible reason behind the observed photocatalytic hydrogen generation and light-harvesting ability of the system. Besides, the defect state, solid core–shell mesoporous structure, and active sites of Ti-MOF help to trap the charge carriers and the reduction of the recombination process. This phenomenon is absent for hollow core–shells Ti-MOF/D spheres due to the rigid TiO2 outer surface although there is a contradiction in surface area with Ti-MOF. Considering the diversity of Ti-MOF and Ti-MOF/D, further novel research can be designed using this way to manipulate their properties as per the requirements. 相似文献
27.
Jain Vipin Ramos‑Meza Carlos Samuel Aslam Ejaz Chawla Chanchal Nawab Tabish Shabbir Malik Shahzad Bansal Ajay 《Clean Technologies and Environmental Policy》2023,25(3):779-779
Clean Technologies and Environmental Policy - 相似文献
28.
29.
30.
This study presents a group skip-lot sampling plan using resampling (SkSP-R) for accelerated life tests. It is assumed that the lifetime of a product follows Weibull distribution with known shape parameter under the use condition, while the scale parameter can be obtained from acceleration factor. The plan parameters are determined through a non-linear optimisation problem for fixed values of producer’s risk and consumer’s risk. The advantages of the proposed plan over the existing one are explained with some practical examples. 相似文献