全文获取类型
收费全文 | 151篇 |
免费 | 6篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 44篇 |
金属工艺 | 2篇 |
机械仪表 | 3篇 |
建筑科学 | 15篇 |
能源动力 | 2篇 |
轻工业 | 5篇 |
水利工程 | 3篇 |
无线电 | 15篇 |
一般工业技术 | 39篇 |
冶金工业 | 14篇 |
自动化技术 | 13篇 |
出版年
2023年 | 1篇 |
2021年 | 2篇 |
2020年 | 3篇 |
2018年 | 1篇 |
2017年 | 3篇 |
2016年 | 4篇 |
2015年 | 2篇 |
2014年 | 4篇 |
2013年 | 12篇 |
2012年 | 3篇 |
2011年 | 9篇 |
2010年 | 10篇 |
2009年 | 5篇 |
2008年 | 17篇 |
2007年 | 5篇 |
2006年 | 13篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 4篇 |
1998年 | 6篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1985年 | 5篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 4篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1976年 | 4篇 |
1974年 | 2篇 |
1972年 | 1篇 |
排序方式: 共有157条查询结果,搜索用时 62 毫秒
81.
A Zn‐Doped CuO Nanocomposite Shows Enhanced Antibiofilm and Antibacterial Activities Against Streptococcus Mutans Compared to Nanosized CuO
下载免费PDF全文
![点击此处可从《Advanced functional materials》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Michal Eshed Jonathan Lellouche Aharon Gedanken Ehud Banin 《Advanced functional materials》2014,24(10):1382-1390
Zinc‐doped copper oxide and copper oxide nanoparticles (NPs) are synthesized and deposited on artificial teeth by sonic irradiation, and the ability of these coatings to restrict biofilm formation by Streptococcus mutans is examined. The CuO and Zn:CuO NP‐coated teeth show significant reductions in biofilm formation of 70% and 88%, respectively, compared to uncoated teeth. The mechanism of the Zn:CuO nanoparticles is investigated, revealing that the nanoparticles attach to and penetrate the bacteria and generate intracellular reactive oxygen species (ROS) that enhance lipid peroxidation and cause cell death. Conversely, the CuO or ZnO NPs do not show this behavior and could not generate intracellular ROS. These results highlight the superior efficacy of Zn:CuO nanocomposites over CuO and ZnO NPs and the role of ROS in their antimicrobial effect. 相似文献
82.
Konstantin Borodianskiy Vladimir Mazurovsky Michael Zinigrad Aharon Gedanken 《Israel journal of chemistry》2007,47(3-4):351-355
Build-up metal for shock-abrasion resistance was the focus of this work, where the mathematical model of physicochemical high-temperature processes developed by the authors in their previous works was used. A computer program based on the model permitted forecasting of the required chemical composition and structure of the build-up metal. Flux-cored wires were fabricated from a cold-rolled ribbon (1008 steel) and filled with a powder mixture. Low carbon steel (A 516) was used as the base metal. The specimens were prepared by 3-layered build-up. The prepared specimens were tested using light microscopy, scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDS), hardness measurements, and shock-abrasion resistance measurements. The results of the above-mentioned tests confirmed the correct calculation of the model and the good shock-abrasion resistance of the suggested build-up metal. 相似文献
83.
A Aharon Y Levy Y Bar-Dayan A Afek G Zandman-Goddard Y Skurnik F Fabrrizzi Y Shoenfeld 《Canadian Metallurgical Quarterly》1997,6(4):408-411
With increasing demand for esthetics, dentists face the challenge of delivering definitive restorations that fulfill patients' expectations of esthetics, biocompatibility, and durability. Recent technical developments have encouraged fabrication of gold-reinforced porcelain inlays that meet these important criteria. This article describes a sequence to construct metal-reinforced porcelain inlay restorations. 相似文献
84.
Seven patients with idiopathic Parkinson's disease, aged 62 to 76 years, average duration of the disease approximately eleven years, suffering from severe hallucinosis and paranoid delusions of different degree, in whom conventional therapeutic strategies (administration of benzodiazepines and mild neuroleptics) had no antipsychotic effect, received clozapine, a non-classical highly potent neuroleptic, while blood count was strictly monitored. Paranoid ideas disappeared in all seven patients after a maximum of four days administration of 25-125 mg/day. No deterioration of parkinsonian symptoms, quantified according to UPDRS was seen. Given the protection of clozapine, we could increase the L-dopa dose in two cases, thereby improving the patients' motor function. Blood count showed no abnormalities in any of the patients during an average observation period of seventeen months. Our results support the assumption that clozapine has a potent antipsychotic effect in the treatment of psychotic decompensation in advanced Parkinson's disease in carefully selected patients. We saw no negative influence of the neuroleptic on extrapyramidal symptoms. 相似文献
85.
Aharon Abeliovich 《Water research》1985,19(12):1497-1503
The aim of the work has been to develop a biological treatment for chemical industry effluents.
A multistage photosynthetic chemostat, fed by chemical industry effluents, was operated continuously as a bench scale experiment aimed at testing the possibility of treating these effluents by means of stabilization ponds. 70–80% of COD and 80–85% of BOD could be removed together with the pesticidal activity present in the raw wastewater. Optimal number of reactors was found to be 6.
Most of the COD and BOD elimination took place during a 30 day detention time. The effluents cannot be considered suitable for free discharge, but can be disposed of by irrigating carefully a halotolerant vegetation. 相似文献
86.
Improved efficiency of dye sensitized solar cells by treatment of the dyed titania electrode with alkyl(trialkoxy)silanes 总被引:2,自引:0,他引:2
Jay Spivack Oltea Siclovan Shellie Gasaway Eric Williams Aharon Yakimov John Gui 《Solar Energy Materials & Solar Cells》2006,90(9):1296-1307
Dye sensitized cells are improved by passivation of the dyed titania electrode by silanizing the dyed surface with alkyl(trialkoxy)silanes. In cells utilizing the ruthenium dye bis(4,4′-dicarboxy-2,2′-bipyridine)bis(thiocyanato)ruthenium (II) (N3) optimum performance is produced by treating the dyed electrode with octyl(trimethoxy)silane in dry toluene. Such treatment increases efficiency as much as 66%, raising cells utilizing an ionic liquid electrolyte with high [I3−] from 1.7% to 2.8% (1 sun AM1.5). The effect on dark currents and on cell efficiencies of this silanization and of dyeing both the FTO and TiO2 surfaces is discussed for ionic liquid and acetonitrile based electrolytes. 相似文献
87.
Aharon M. Eyal 《溶剂提取与离子交换》2013,31(6):951-969
Literature on HF extraction by amines and by tributyl phosphate is critically reviewed. The system amine-HF-H2O shows an interesting feature concerning properties such as distribution curves compared to those for extraction of other acids, similarity to extraction by TBP, water extraction, selectivity, effect of amine type and dilution and diluent effect These properties sharply change (or even invert) when HF/amine molar ratio exceeds 2. 相似文献
88.
The dependence of the macroscopic shape of pure carbon on the precursor structure is observed using Reactions under Autogenic Pressure at Elevated Temperatures (RAPET) for the thermal dissociation of several precursors, including stearic acid, oleic acid, linoleic acid, methyl 3 butenoate, methyl butyrate, octadecane, octadecene, octane, octene and acrolein. The precursors are dissociated under their autogenic pressure developed at 700 °C to create a range of pure carbon microstructures. Prolate spheroidal-shaped carbon (PSSHC) is prepared by heating octene, among others, at 700 °C in a closed cell in a one-step process. The dimensions of the carbon bodies were 3–5 μm for the polar diameter and 6–8 μm for the equatorial diameter. Obtaining the PSSHC from octene is in contrast to a previous work, which required a long hydrocarbon chain and the presence of oxygen for the formation of PSSHC upon thermolysis under identical autogenic pressure. The products of the RAPET reaction of octene showed a strong ESR signal, resulting from nonbonding dangling electrons on the carbon surface. However, treating the carbons with a beam of hydrogen atoms has almost completely eliminated the ESR signal. The question why the thermal dissociation of some precursors yield PSSHC, while other precursors yield other morphologies, is discussed. 相似文献
89.
Aharon M. Eyal 《溶剂提取与离子交换》2013,31(6):971-986
Analysis of data concerning HF extraction by amines reveals a change in extraction mechanism when HF/amine molar ratio in organic phase (Z) reaches 2. Up to this point extraction is by ion-pair formation and after it by H-bonding. As a result, the two HF molecules initially extracted differ in nature from subsequent ones. The change in mechanism explains why seemingly unrelated properties such as water co-extraction dilution and diluent effects, selectivity and viscosity - all change when amine bifluoride composition is attained. Similar change in extraction of other mono-basic acids occurs at Z=1. The system with Z>2 for HF is equivalent to that with Z>1 for other mono-basic acids and to that of extraction by TBP. It therefore provides a model for extraction from concentrated aqueous solutions. 相似文献
90.
Patra CR Patra S Gabashvili A Mastai Y Koltypin Y Gedanken A Palchik V Slifkin MA 《Journal of nanoscience and nanotechnology》2006,6(3):845-851
In this article, a simple microwave route was applied for the synthesis of nanoflakes and dendrite-type beta-indium sulfide (In2S3) in high yield (> 97%), using a homogeneous mixture of indium(lll)chloride and thiourea in an ethylene glycol (EG)/polyethylene glycol (PEG400) solvent. The reaction was conducted in a simple domestic microwave oven (DMO). Powder X-ray diffraction (XRD), low resolution and high resolution transmission electron microscopy (LRTEM and HRTEM), selected area electron diffraction (SAED), and energy dispersive X-ray spectroscopy (EDS), were applied to investigate the crystallinity, structure, morphology, and composition of the In2S3 nano-materials. Both the as-synthesized and calcined In2S3 products were a body-centered tetragonal (bct) phase, observed by XRD and HRTEM. The length and width of the resulting nanoflakes were in the range of 70-600 nm and 4-10 nm, respectively. The optical band gap of the powder was determined by diffuse reflectance spectroscopy (DRS) and was found to be 2.44 eV. The electronic properties of the products were studied by measuring the optical absorption spectra using photoacoustic spectroscopy. The band gap calculated by this method was found to be 2.52 eV. A possible mechanism for the formation of nanoflakes/dendrites-type In2S3 was also discussed. 相似文献