全文获取类型
收费全文 | 239篇 |
免费 | 19篇 |
专业分类
电工技术 | 5篇 |
化学工业 | 102篇 |
机械仪表 | 2篇 |
建筑科学 | 9篇 |
矿业工程 | 1篇 |
能源动力 | 6篇 |
轻工业 | 51篇 |
水利工程 | 1篇 |
石油天然气 | 4篇 |
无线电 | 8篇 |
一般工业技术 | 26篇 |
冶金工业 | 21篇 |
自动化技术 | 22篇 |
出版年
2023年 | 4篇 |
2022年 | 29篇 |
2021年 | 41篇 |
2020年 | 16篇 |
2019年 | 9篇 |
2018年 | 14篇 |
2017年 | 10篇 |
2016年 | 12篇 |
2015年 | 8篇 |
2014年 | 14篇 |
2013年 | 8篇 |
2012年 | 13篇 |
2011年 | 9篇 |
2010年 | 6篇 |
2009年 | 6篇 |
2008年 | 8篇 |
2007年 | 8篇 |
2006年 | 4篇 |
2004年 | 4篇 |
2003年 | 4篇 |
2002年 | 1篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1998年 | 4篇 |
1997年 | 7篇 |
1996年 | 5篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 1篇 |
排序方式: 共有258条查询结果,搜索用时 46 毫秒
41.
Antonino Giaccone Giovanni Lascari Giorgia Peri Gianfranco Rizzo 《Energy Efficiency》2017,10(1):129-149
Energy master plans are important tools for an effective and sustainable land governance. On the other hand, the stakeholder role in setting priorities for planning energy interventions is dramatically increasing, also in the light of recently issued European directives. The priorities of energy-saving measures of the Sicilian energy and environmental master plan were originally established with the application of typical economic indicators (the cost of saved energy and the cost of avoided pollutant emissions). During the prioritization process, there was a minor contribution from stakeholders who were not directly involved in the priority-setting process but were only asked to express their opinions according to the in-force regulations. Based on more active stakeholder involvement in hierarchizing a given set of actions, as required by the recently issued directives, the University of Palermo, which participated in the development of this master plan, assessed an ex post evaluation of these established economy-based priorities, by means of the application of a multi-criteria decision analysis (MCDA) tool. The resulting changed priorities, which lead to a better policy allocation of the regional budget for energy efficiency in the building sector, confirm the preeminent role played by the stakeholders in the development of energy plans, further supported by a sensitivity analysis. 相似文献
42.
Siyuan Chen Furong Qin Manni Wang Yuquan Wei Zhiyong Qian Xiawei Wei 《Nano Research》2022,(3):2177-2195
The immunosuppressive tumor microenvironment(TME)is crucial in the occurrence of tumorigenesis,metastasis,and drug resistance.Among all stromal cells,tumor-asso... 相似文献
43.
Polycyclic aromatic hydrocarbons in frying oils and snacks 总被引:2,自引:0,他引:2
The high incidence of lung cancer observed among Chinese women has been associated with exposure to fumes from cooking oil. Polycyclic aromatic hydrocarbons (PAHs) are a class of potentially mutagenic substances emitted from cooking oils heated at high temperatures. The objective of this study was to investigate whether deep frying with different oils under different conditions leads to the development of PAHs either in the oil or in the fried product (snacks). PAH analysis was carried out with solid-phase extraction followed by reverse-phase high-performance liquid chromatography and spectrofluorometric detection. Different oils were used to fry chips and extruded snacks in different industrial plants (continuous frying) at temperatures between 170 and 205 degrees C, and peanut oil was used to fry French fries and fish (discontinuous frying) at temperatures between 160 and 185 degrees C. No appreciable differences in PAH load was observed in the same oil before and after frying. Both before and after frying, the benzo[a]pyrene concentration in oils ranged from trace to 0.7 ppb. All the analyzed samples, including oils from fried snacks, had benzo[a]pyrene concentrations well below the 2 ppb limit recently proposed by the European Community. 相似文献
44.
Functionalized carbon nanotubes are non-cytotoxic and preserve the functionality of primary immune cells 总被引:1,自引:0,他引:1
Dumortier H Lacotte S Pastorin G Marega R Wu W Bonifazi D Briand JP Prato M Muller S Bianco A 《Nano letters》2006,6(7):1522-1528
Carbon nanotubes are emerging as innovative tools in nanobiotechnology. However, their toxic effects on environment and health have become an issue of strong concern. In the present study, we address the impact of functionalized carbon nanotubes (f-CNTs) on cells of the immune system. We have prepared two types of f-CNTs, following the 1,3-dipolar cycloaddition reaction (f-CNTs 1 and 2) and the oxidation/amidation treatment (f-CNTs 3 and 4), respectively. We have found that both types of f-CNTs are uptaken by B and T lymphocytes as well as macrophages in vitro, without affecting cell viability. Subsequently, the functionality of the different cells was analyzed carefully. We discovered that f-CNT 1, which is highly water soluble, did not influence the functional activity of immunoregulatory cells. f-CNT 3, which instead possesses reduced solubility and forms mainly stable water suspensions, preserved lymphocytes' functionality while provoking secretion of proinflammatory cytokines by macrophages. 相似文献
45.
Fermented Nut‐Based Vegan Food: Characterization of a Home made Product and Scale‐Up to an Industrial Pilot‐Scale Production
下载免费PDF全文
![点击此处可从《Journal of food science》网站下载免费的PDF全文](/ch/ext_images/free.gif)
46.
47.
Citrus monstruosa Discrimination among Several Citrus Species by Multivariate Analysis of Volatiles: A Metabolomic Approach
下载免费PDF全文
![点击此处可从《Journal of Food Processing and Preservation》网站下载免费的PDF全文](/ch/ext_images/free.gif)
48.
Giorgia Foca Carlotta Ferrari Alessandro Ulrici Maria Cristina Ielo Giovanna Minelli Domenico Pietro Lo Fiego 《Food Analytical Methods》2016,9(10):2791-2806
In this work, FT-NIR spectroscopy was employed to determine iodine value (IV) and fatty acids (FA) content of pig fat samples, through the combined use of signal preprocessing, multivariate calibration, and variable selection methods. In particular, the main focus was on the use of variable selection methods, both in order to improve the predictive performance of the calibration models, and to identify relevant wavelengths that could be subsequently used for the development of simple, fast, and cheap hand-held devices, able to measure IV and FA content directly on the fat without the need of any sample pretreatment. Firstly, for each property of interest, partial least squares (PLS) multivariate calibration models were calculated considering the whole spectral range and testing different signal preprocessing methods. Then, once chosen the optimal signal preprocessing method, a two-step variable selection procedure was applied. In the first step, the interval-PLS variable selection algorithm was used to calculate a set of calibration models, whose outcomes were considered altogether in the second step, in order to select the optimal calibration model. The variable selection procedure allowed to lower the number of spectral variables retained by the model, and often led to an increase of the performance in prediction of the external test set samples. 相似文献
49.
Vincenzo Lo Turco Angela Giorgia Potortì Alessia Tropea Ermina Katia Casale Maria Rita Fede 《Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment》2016,33(11):1693-1699
Twenty-six plasticisers and bisphenol A (BPA) in 39 Sicilian and Calabrian nectar honeys of different botanical south Italian origin were determined by GC-MS. Di-(2-ethylhexyl)phthalate was the most abundant plasticiser in all samples, reaching up 202.7 ± 153.1 µg kg–1, followed by di-butylphthalate with a concentration of 40.3 ± 9.3 µg kg–1, whereas the concentration of the other phthalates varied from not detectable to 68.2 µg kg–1. Trace levels of adipate, sebacate and BPA were not detected in any samples. Among the different floral origin honeys, di-ethylphthalate levels were above the limit of quantification (LOQ) in orange blossom, wildflower and chestnut honey samples. Among the honeys of different geographical origin, di-methylphthalate, di-butylphthalate and di-(2-ethylhexyl)phthalate concentrations were similar. Calabrian honeys showed levels of di-ethylphthalate always lower than the LOQ, moreover di-(2-methylpropyl)phthalate levels were lower than the Sicilian ones. On the contrary, in Sicilian honeys di-(2-methylpropyl)phthalate levels were higher and di-ethylphthalate was present in 37% of samples. 相似文献
50.
Cecchini P De Franceschi G Frare E Fontana A Polverino de Laureto P 《Protein engineering, design & selection : PEDS》2012,25(4):199-203
In order to understand the role of tryptophan in the mechanisms of fibrils formation, the ability of a series of analogs of the residue 7-18 span of myoglobin to form amyloid-like fibrils was investigated. Alternatively one or both tryptophans were substituted with alanine and leucine, to determine the contribution of hydrophobicity and aromaticity. The scale of aggregation propensity of the peptides determined indicates that tryptophan is crucial for the amyloidogenic process. Since the rare tryptophan residue is generally engaged in structural roles in proteins, or when exposed serves as binding sites, we surmise that its exposure in the amyloidogenic fragments allows for intermolecular clustering with residues from other molecules leading to the formation of amyloid aggregates. 相似文献