全文获取类型
收费全文 | 151篇 |
免费 | 24篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 3篇 |
综合类 | 5篇 |
化学工业 | 64篇 |
金属工艺 | 5篇 |
机械仪表 | 7篇 |
建筑科学 | 1篇 |
矿业工程 | 2篇 |
能源动力 | 10篇 |
轻工业 | 10篇 |
无线电 | 18篇 |
一般工业技术 | 25篇 |
冶金工业 | 8篇 |
自动化技术 | 19篇 |
出版年
2023年 | 3篇 |
2022年 | 4篇 |
2021年 | 12篇 |
2020年 | 12篇 |
2019年 | 15篇 |
2018年 | 17篇 |
2017年 | 14篇 |
2016年 | 17篇 |
2015年 | 11篇 |
2014年 | 14篇 |
2013年 | 14篇 |
2012年 | 16篇 |
2011年 | 12篇 |
2010年 | 6篇 |
2009年 | 2篇 |
2008年 | 3篇 |
2007年 | 1篇 |
2006年 | 1篇 |
2005年 | 2篇 |
1981年 | 1篇 |
排序方式: 共有177条查询结果,搜索用时 15 毫秒
171.
Maryam Gholami Kiana Shahzamani Abdolrazagh Marzban Hamed Esmaeil Lashgarian 《IET nanobiotechnology / IET》2018,12(8):1114
Development of a green chemistry process for the synthesis of silver nanoparticles (AgNPs) has become a focus of interest. Characteristics of AgNPs were determined using techniques, such as ultraviolet–visible spectroscopy (UV–vis), Fourier transform infrared (FTIR) analysis, scanning electron microscopy (SEM), energy‐dispersive X‐ray spectroscopy and X‐ray diffraction (XRD). The synthesised AgNPs using Thymus kotschyanus had the most growth inhibition against gram‐positive bacteria such as Staphylococcus aureus and Bacillus subtilise, while the growth inhibition of AgNPs at 1000–500 µg/ml occurred against Klebsiella pneumonia and at 1000–250 µg/ml of AgNPs was observed against E. coli. The UV–vis absorption spectra confirmed the formation of the AgNPs with the characteristic peak at 415 nm and SEM micrograph acknowledged spherical particles in a nanosize range. FTIR measured the possible biomolecules that are responsible for stabilisation of AgNPs. XRD analysis exhibited the crystalline nature of AgNPs and showed face‐centred cubic structure. The synthesised AgNPs revealed significant antibacterial activity against gram‐positive bacteria.Inspec keywords: visible spectra, microorganisms, ultraviolet spectra, biomedical materials, nanofabrication, nanoparticles, X‐ray diffraction, scanning electron microscopy, molecular biophysics, X‐ray chemical analysis, nanomedicine, silver, antibacterial activity, Fourier transform infrared spectraOther keywords: green chemistry process, ultraviolet–visible spectroscopy, gram‐positive bacteria, silver nanoparticles, Thymus kotschyanus aqueous extract, UV–vis spectroscopy, Fourier transform infrared spectroscopy, FTIR analysis, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, SEM micrograph, X‐ray diffraction, XRD, Staphylococcus aureus, Bacillus subtilise, Klebsiella pneumonia, E. coli, UV–vis absorption spectra, face‐centred cubic structure, antibacterial activity, antimicrobial activity, wavelength 415.0 nm, Ag 相似文献
172.
The influences of cupric ion concentration (5-35 g/L),current density (500-2000 A/m2),circulation rate of the electrolyte solution (15-120 mL/min),and temperature (25-60℃) on the physical and chemical properties of copper powders obtained in electrolysis cells were investigated.Two industrial processes,electrorefining (ER) cells with a synthetic electrolyte and electrowinning (EW) cells with an original solution of coppermineral leaching,were utilized to produce copper powders.Finally,the statistical full f... 相似文献
173.
Mohammad H. AHMADI Mohammad-Ali AHMADI Esmaeil ABOUKAZEMPOUR Lavinia GROSU Fathollah POURFAYAZ Mokhtar BIDI 《Frontiers in Energy》2019,13(2):399
Owing to the energy demands and global warming issue, employing more effective power cycles has become a responsibility. This paper presents a thermodynamical study of an irreversible Brayton cycle with the aim of optimizing the performance of the Brayton cycle. Moreover, four different schemes in the process of multi-objective optimization were suggested, and the outcomes of each scheme are assessed separately. The power output, the concepts of entropy generation, the energy, the exergy output, and the exergy efficiencies for the irreversible Brayton cycle are considered in the analysis. In the first scheme, in order to maximize the exergy output, the ecological function and the ecological coefficient of performance, a multi-objective optimization algorithm (MOEA) is used. In the second scheme, three objective functions including the exergetic performance criteria, the ecological coefficient of performance, and the ecological function are maximized at the same time by employing MOEA. In the third scenario, in order to maximize the exergy output, the exergetic performance criteria and the ecological coefficient of performance, a MOEA is performed. In the last scheme, three objective functions containing the exergetic performance criteria, the ecological coefficient of performance, and the exergy-based ecological function are maximized at the same time by employing multi-objective optimization algorithms. All the strategies are implemented via multi-objective evolutionary algorithms based on the NSGAII method. Finally, to govern the final outcome in each scheme, three well-known decision makers were employed. 相似文献
174.
Sajjad S. Mofarah Esmaeil Adabifiroozjaei Raheleh Pardehkhorram M. Hussein N. Assadi Manuel Hinterstein Yin Yao Xinhong Liu Mohammad B. Ghasemian Kourosh Kalantar‐Zadeh Rashid Mehmood Claudio Cazorla Reza Shahmiri Ghazaleh Bahmanrokh Saroj Bhattacharyya Maria Chiara Spadaro Jordi Arbiol Sean Lim Yuwen Xu Hamidreza Arandiyan Jason Scott Pramod Koshy Charles C. Sorrell 《Advanced materials (Deerfield Beach, Fla.)》2019,31(52)
175.
Sajjad S. Mofarah Esmaeil Adabifiroozjaei Raheleh Pardehkhorram M. Hussein N. Assadi Manuel Hinterstein Yin Yao Xinhong Liu Mohammad B. Ghasemian Kourosh Kalantar‐Zadeh Rashid Mehmood Claudio Cazorla Reza Shahmiri Ghazaleh Bahmanrokh Saroj Bhattacharyya Maria Chiara Spadaro Jordi Arbiol Sean Lim Yuwen Xu Hamidreza Arandiyan Jason Scott Pramod Koshy Charles C. Sorrell 《Advanced materials (Deerfield Beach, Fla.)》2019,31(52)
Holey 2D metal oxides have shown great promise as functional materials for energy storage and catalysts. Despite impressive performance, their processing is challenged by the requirement of templates plus capping agents or high temperatures; these materials also exhibit excessive thicknesses and low yields. The present work reports a metal‐based coordination polymer (MCP) strategy to synthesize polycrystalline, holey, metal oxide (MO) nanosheets with thicknesses as low as two‐unit cells. The process involves rapid exfoliation of bulk‐layered, MCPs (Ce‐, Ti‐, Zr‐based) into atomically thin MCPs at room temperature, followed by transformation into holey 2D MOs upon the removal of organic linkers in aqueous solution. Further, this work represents an extra step for decorating the holey nanosheets using precursors of transition metals to engineer their band alignments, establishing a route to optimize their photocatalysis. The work introduces a simple, high‐yield, room‐temperature, and template‐free approach to synthesize ultrathin holey nanosheets with high‐level functionalities. 相似文献
176.
This paper presents the results of an investigation into the behaviour and ultimate strength characteristics of imperfect steel plates used in ships and other related marine structures. The analysed plates are suffering from general corrosion on their both surfaces and subjected to uniaxial in-plane compression. A series of elastic and elastic–plastic large deflection finite element analyses is performed on the both-sides randomly corroded steel plates. The effects of general corrosion are introduced into the finite element models using a specially developed random thickness surface model. The effects of random thickness reduction on the plate strength characteristics as a result of systematic variation of the involved parameters are evaluated. 相似文献
177.
Journal of Computational Electronics - Fe2TiO5, pseudobrookite, with a high Seebeck coefficient and very low thermal conductivity, shows promising thermoelectric properties. However, due to its low... 相似文献