全文获取类型
收费全文 | 120篇 |
免费 | 7篇 |
专业分类
电工技术 | 3篇 |
化学工业 | 72篇 |
金属工艺 | 2篇 |
机械仪表 | 2篇 |
建筑科学 | 7篇 |
能源动力 | 2篇 |
轻工业 | 16篇 |
无线电 | 1篇 |
一般工业技术 | 15篇 |
冶金工业 | 2篇 |
原子能技术 | 1篇 |
自动化技术 | 4篇 |
出版年
2023年 | 2篇 |
2022年 | 29篇 |
2021年 | 17篇 |
2020年 | 13篇 |
2019年 | 4篇 |
2018年 | 4篇 |
2017年 | 3篇 |
2016年 | 5篇 |
2015年 | 4篇 |
2014年 | 6篇 |
2013年 | 6篇 |
2012年 | 2篇 |
2011年 | 8篇 |
2010年 | 9篇 |
2009年 | 2篇 |
2008年 | 4篇 |
2007年 | 2篇 |
2006年 | 2篇 |
2005年 | 1篇 |
2004年 | 2篇 |
2000年 | 1篇 |
1997年 | 1篇 |
排序方式: 共有127条查询结果,搜索用时 0 毫秒
21.
Amalia Di Petrillo Celestino Santos-Buelga Benedetta Era Ana Maria González-Paramás Carlo Ignazio Giovanni Tuberoso Rosaria Medda Francesca Pintus Antonella Fais 《Food science and biotechnology》2018,27(1):139-146
Sardinian honeys obtained from different floral sources (Arbutus, Asphodelus, Eucalyptus, Thistle, and Sulla) were evaluated for their ability to inhibit tyrosinase and xanthine oxidase enzymes and for their antioxidant activity. Physicochemical parameters, total phenolic, and flavonoids content were also determined. Honey from Arbutus flowers had the highest antioxidant activity followed by Eucalyptus and Thistle ones. These three honeys showed good tyrosinase and xanthine oxidase inhibition properties. Thus, these Sardinian honeys could have a great potential as antioxidant sources for pharmaceutical and cosmetic applications. 相似文献
22.
Benedetta Pasquini Mohammad Goodarzi Serena Orlandini Giangiacomo Beretta Sandra Furlanetto Bieke Dejaegher 《International Journal of Food Science & Technology》2014,49(5):1351-1359
In this article, discrimination models are presented, relating the origin of honey samples to several variables, being the concentrations of different cations and anions in the honey samples measured by ion chromatography, and parameters that measure/reflect the antioxidant activity of the honey samples. The unsupervised method, principal component analysis, and supervised discrimination methods, such as linear and quadratic discriminant analysis, and classification and regression trees (CART), were applied to evaluate the existence of data patterns and the relationship between geographical origin and the measured parameters. The model with the best predictive ability (%CCRTEST = 66.67%), the best overall % specificity (80%) and the best overall % sensitivity (67%) was found to be CART. It was proven that the mineral content and parameters analysed can provide enough information for the geographical characterisation and discrimination of honey. 相似文献
23.
Fabio Maria Sabbatini Dr. Romano Di Fabio Dr. Mauro Corsi Dr. Paolo Cavanni Dr. Steve M. Bromidge Dr. Yves St‐Denis Dr. Lucilla D'Adamo Dr. Marilisa Rinaldi Dr. Chiara Savoia Dr. Claudia Mundi Dr. Benedetta Perini Dr. Andrew J. Carpenter Dr. Giovanna Dal Forno Dr. Federico Faggioni Dr. Michela Tessari Dr. Francesca Pavone Dr. Alberto Buson Dr. Mario Mattioli Dr. Elisabetta Perdona' Dr. Sergio Melotto Dr. 《ChemMedChem》2010,5(9):1450-1455
24.
The statistical features of the amplitudes obtained via precession electron diffraction have been studied, with particular concern with their effects on direct phasing procedures. A new algorithm, denoted by BEA, is described: according to it, the average amplitude of the symmetry equivalent reflections is used in the Direct Methods step. Once an even imperfect structural model is available, the best amplitude among the equivalent reflections is used to improve the model. It is shown that BEA is able to provide more complete structural models, to make the phasing process more straightforward and to end with crystallographic residual much better than those usually obtained by electron diffraction. 相似文献
25.
Benedetta Marmiroli Gianluca Grenci Fernando Cacho-Nerin Barbara Sartori Peter Laggner Luca Businaro Heinz Amenitsch 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2010,268(3-4):329-333
Recently, we have designed, fabricated and tested a free-jet micromixer for time resolved small angle X-ray scattering (SAXS) studies of nanoparticles formation in the <100 μs time range. The microjet has a diameter of 25 μm and a time of first accessible measurement of 75 μs has been obtained. This result can still be improved. In this communication, we present a method to estimate whether a given chemical or biological reaction can be investigated with the micromixer, and to optimize the beam size for the measurement at the chosen SAXS beamline. Moreover, we describe a system based on stereoscopic imaging which allows the alignment of the jet with the X-ray beam with a precision of 20 μm. The proposed experimental procedures have been successfully employed to observe the formation of calcium carbonate (CaCO3) nanoparticles from the reaction of sodium carbonate (Na2CO3) and calcium chloride (CaCl2). The induction time has been estimated in the order of 200 μs and the determined radius of the particles is about 14 nm. 相似文献
26.
Domenico Strazza Benedetta Grassi Marco Demori Vittorio Ferrari Pietro Poesio 《Chemical engineering science》2011,66(12):6099
An analysis of high viscosity oil/water flow in horizontal and slightly inclined pipe is presented. We propose experimental flow maps – in particular we focus on the core-annular flow pattern boundary – pressure drops, and oil hold-up measurements. Experimental data are used to validate some models present in literature. Since hold-up measurement in liquid–liquid systems is particularly challenging and, therefore, only few data are available in literature, they are analyzed and commented in detail. The slip ratio computed by hold-up data is also provided and analyzed. 相似文献
27.
Gabriele Landucci Benedetta NucciLuigi Pelagagge Cristiano Nicolella 《Journal of food engineering》2011,105(1):105-111
This work presents a methodology for the assessment of hazards due to the formation of flammable mixtures in edible oil refineries, with particular focus on storage tanks. Safety issues in these plants are due to the presence of residual volatile flammable solvents deriving from the extraction processes, which may accumulate in the storage tanks and generate flammable vapour mixtures. The methodology, based on the application of a thermodynamic model for the estimation of vapour phase composition in oil storage tanks as a function of operating conditions (i.e. temperature and residual solvent content), allows the identification of potential hazards due to formation of flammable mixtures inside the tanks. The model was first validated using available experimental data and then extended to case-studies representative of state-of-the-art industrial storage applications. The results of the case-studies were then used to calculate specific hazard indexes, providing a quick tool for preliminary assessment of hazards due to the formation of flammable mixtures in edible oil storage plants. 相似文献
28.
Tomei G Ciarrocca M Fiore P Rosati MV Pimpinella B Anzani MF Giubilati R Cangemi C Tomao E Tomei F 《The Science of the total environment》2008,392(2-3):198-202
BACKGROUND: The aim of the study is to evaluate if occupational exposure to chemical, physical and psycho-social urban stressor could cause alterations in plasma free testosterone (T) levels and related diseases in female traffic police vs. control group. PATIENTS AND METHODS: The research was carried out on initial sample of 468 female Municipal Police employees (209 traffic police and 259 controls). After excluding the principal confounding factors, traffic police were matched with controls by age, working life, menstrual cycle day, BMI, drinking habit, cigarette smoking habit, liquorice and soy intake in diet, habitual consumption of Italian coffee. There were 96 female traffic police and 96 controls included in the study. RESULTS: T mean levels were significantly higher in female traffic police compared to controls (p=0.000). The distribution of T values in traffic police and in controls was significant (p=0.000). No significant differences were found comparing the percentage in traffic police and controls concerning dystocial, premature and post-term birth. An increase in mental health disorders was found in traffic police compared to controls but the difference was not significant. CONCLUSION: The increase in T plasma levels observed in traffic police vs. controls can be due to a chronic working exposure to low doses of environmental chemical urban stressor. According to our previous researches T could be used as an early biological marker even before the onset of the related disorders. 相似文献
29.
Ciarrocca M Tomei F Bernardini A Capozzella A Fiore P Amicarelli V Sancini A Perugi F Firullo E Rosati MV Pimpinella B Monti C Tomei G 《The Science of the total environment》2006,370(1):17-22
Urban outside workers, such as traffic police, are daily exposed to air pollutants and psychosocial stressors: for these workers, the working environment corresponds to the living environment of the general population. Studies in the literature have shown that immune parameters could be affected by chronic exposure to various chemical pollutants. The aim of this study is to evaluate whether occupational exposure to urban pollutants can cause alterations in NK, IL-2, IFN-gamma and C3 plasma levels in female traffic police compared to a control group. After excluding subjects with the principal confounding factors, 86 female traffic police and 87 controls were matched by age, years of police work and habitual alcohol consumption. The distribution of NK values in female traffic police and controls was significantly different (p=0.000); NK values above the upper limit of the normal laboratory range were observed in 23 female traffic police and in 2 controls (p=0.000). IL-2 mean levels were higher in traffic police compared to controls, but the difference was not significant. The mean and the distribution of IFN-gamma values in female traffic police and controls were not different. C3 mean levels were higher in female traffic police versus controls, but the difference was not significant. Considering that the subjects with the principal confounding factors were excluded from the study and that female traffic police and controls were matched by the above-mentioned variables, our results suggest that chronic occupational exposure to low doses of chemical stressors, which may interact with and add to psychosocial ones, can affect both innate and adaptative immunity. 相似文献
30.
Bioinspired Films: Self‐Assembly of the Cephalopod Protein Reflectin (Adv. Mater. 38/2016) 下载免费PDF全文
Kyle L. Naughton Long Phan Erica M. Leung Rylan Kautz Qiyin Lin Yegor Van Dyke Benedetta Marmiroli Barbara Sartori Andy Arvai Sheng Li Michael E. Pique Mahan Naeim Justin P. Kerr Mercedeez J. Aquino Victoria A. Roberts Elizabeth D. Getzoff Chenhui Zhu Sigrid Bernstorff Alon A. Gorodetsky 《Advanced materials (Deerfield Beach, Fla.)》2016,28(38):8553-8553