全文获取类型
收费全文 | 1561篇 |
免费 | 115篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 20篇 |
化学工业 | 439篇 |
金属工艺 | 52篇 |
机械仪表 | 51篇 |
建筑科学 | 41篇 |
矿业工程 | 2篇 |
能源动力 | 49篇 |
轻工业 | 320篇 |
水利工程 | 19篇 |
石油天然气 | 16篇 |
无线电 | 89篇 |
一般工业技术 | 274篇 |
冶金工业 | 126篇 |
原子能技术 | 11篇 |
自动化技术 | 168篇 |
出版年
2024年 | 5篇 |
2023年 | 17篇 |
2022年 | 53篇 |
2021年 | 89篇 |
2020年 | 47篇 |
2019年 | 64篇 |
2018年 | 69篇 |
2017年 | 84篇 |
2016年 | 68篇 |
2015年 | 41篇 |
2014年 | 66篇 |
2013年 | 122篇 |
2012年 | 101篇 |
2011年 | 124篇 |
2010年 | 81篇 |
2009年 | 90篇 |
2008年 | 89篇 |
2007年 | 61篇 |
2006年 | 46篇 |
2005年 | 34篇 |
2004年 | 35篇 |
2003年 | 27篇 |
2002年 | 19篇 |
2001年 | 15篇 |
2000年 | 11篇 |
1999年 | 15篇 |
1998年 | 39篇 |
1997年 | 27篇 |
1996年 | 24篇 |
1995年 | 18篇 |
1994年 | 21篇 |
1993年 | 11篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1990年 | 6篇 |
1989年 | 5篇 |
1988年 | 6篇 |
1987年 | 3篇 |
1986年 | 8篇 |
1985年 | 4篇 |
1984年 | 5篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1976年 | 5篇 |
1973年 | 1篇 |
排序方式: 共有1677条查询结果,搜索用时 15 毫秒
81.
Trihalomethanes minimization in drinking water by coagulation/flocculation/sedimentation with natural coagulant Moringa oleifera Lam and activated carbon filtration
下载免费PDF全文
![点击此处可从《加拿大化工杂志》网站下载免费的PDF全文](/ch/ext_images/free.gif)
82.
Luís Filipe Sanches Fernandes Maria João Marques Paula Cristina Oliveira João Paulo Moura 《Water and Environment Journal》2014,28(3):350-357
This paper puts forward the importance of decision support systems (DSS) for the planning and management of water resources. A case study of the Pinhão river basin, in Portugal, is presented. Given the importance of vineyards in the Douro region, it is important to determine if water availability will be enough to meet present and future water demands. In order to answer this question, DSS tools were used to assess different scenarios. The MIKE BASIN software was used in the hydrographical basin of Pinhão river, assisted by a geographic information system, GIS, which allowed the modelling of the basin, both temporally and spatially, facilitating the visualisation and interpretation of results. According to the attained results, it was verified that, at present, the hydrographical basin meets the considered water needs. The DSS proved to be an important tool to assist the decision‐making process in the studied river basin. 相似文献
83.
84.
Andr Neto Carlos Silva Jorge Sousa Horcio Fernandes Carlos Hidalgo Jose Luis De Pablos Sophie Salasca Jean-Marcel Travre Jonathan B. Lister 《Fusion Engineering and Design》2009,84(7-11):1412-1415
The amount of data generated by the infra-red and visible cameras at ITER is expected to be considerably larger than most diagnostics. ITER will have 12 infra-red cameras plus 12 visible cameras in four different equatorial port plugs. Each of the ports will have a Plant System Host (PSH) that will provide a standard image of the plant system to the ITER's Control and Data Access and Communication (CODAC) system.The two key functions of these cameras will be the scientific exploitation with the detection of interesting physics events and the operational protection of the machine, namely the first wall. Already assuming high bandwidth requirements for both audio and video, ITER will provide a separate network for this kind of communication, which will be used to transmit both the experimental and informational data provided by the cameras.This paper presents the current camera plant system design and its interaction with ITER CODAC system and networks. Starting from the camera specifications several alternatives for data collection and compression are discussed. The required inputs from CODAC and a first specification for the internal finite state machine are also presented. Finally, a possible hardware straw man design solution for the plant system hardware is proposed. 相似文献
85.
Ângela Fernandes João C. M. Barreira Amilcar L. Antonio M. Beatriz P. P. Oliveira Anabela Martins Isabel C. F. R. Ferreira 《Food and Bioprocess Technology》2014,7(6):1606-1617
Mushrooms are very perishable foods due to their high susceptibility to moisture loss, changes in color and texture, or microbiological spoilage. Drying is considered as the most appropriate method to prevent these alterations, but it has some limitations, such as shrinkage, enzymatic and non-enzymatic browning reactions, and oxidation of lipids and vitamins. According to previous studies, irradiation might effectively attenuate the undesirable changes caused by drying process, ensuring also higher shelf-life of mushrooms and their decontamination. Electron-beam irradiation presents some technological advantages, since it allows higher dose rates and the possibility to be used in most foods/or thin products in a short period. Herein, the combined effects of electron-beam irradiation (0, 0.5, 1 and 6 kGy) and storage time (0, 6 and 12 months) were evaluated by measuring changes in nutritional parameters, namely, free sugars, tocopherols, fatty acids and antioxidant activity. As indicated by linear discriminant analysis, storage time had a higher effect on all the evaluated parameters, except fatty acids, which suffer significant changes with both factors. Overall, the obtained results indicate that electron-beam irradiation might be considered as a suitable technique, allowing long-lasting conservation periods while reducing changes induced by drying treatment. 相似文献
86.
Renan C. Chisté Marisa Freitas Adriana Z. Mercadante Eduarda Fernandes 《Journal of food science》2014,79(9):H1841-H1847
β‐Carotene, zeaxanthin, lutein, β‐cryptoxanthin, and lycopene are liposoluble pigments widely distributed in vegetables and fruits and, after ingestion, these compounds are usually detected in human blood plasma. In this study, we evaluated their potential to inhibit hemolysis of human erythrocytes, as mediated by the toxicity of peroxyl radicals (ROO?). Thus, 2,2′‐azobis (2‐methylpropionamidine) dihydrochloride (AAPH) was used as ROO? generator and the hemolysis assay was carried out in experimental conditions optimized by response surface methodology, and successfully adapted to microplate assay. The optimized conditions were verified at 30 × 106 cells/mL, 17 mM of AAPH for 3 h, at which 48 ± 5% of hemolysis was achieved in freshly isolated erythrocytes. Among the tested carotenoids, lycopene (IC50 = 0.24 ± 0.05 μM) was the most efficient to prevent the hemolysis, followed by β‐carotene (0.32 ± 0.02 μM), lutein (0.38 ± 0.02 μM), and zeaxanthin (0.43 ± 0.02 μM). These carotenoids were at least 5 times more effective than quercetin, trolox, and ascorbic acid (positive controls). β‐Cryptoxanthin did not present any erythroprotective effect, but rather induced a hemolytic effect at the highest tested concentration (3 μM). These results suggest that selected carotenoids may have potential to act as important erythroprotective agents by preventing ROO?‐induced toxicity in human erythrocytes. 相似文献
87.
Fernandes A.L. Raginsky M. Coleman T.P. 《Signal Processing, IEEE Transactions on》2009,57(5):1731-1744
We propose a scheme for rate-constrained distributed nonparametric regression using a wireless sensor network. The scheme is universal across a wide range of sensor noise models, including unbounded and nonadditive noise; it has low complexity, requiring simple operations such as uniform scalar quantization with dither and message passing between neighboring nodes in the network, and attains minimax optimality for regression functions in common smoothness classes. We present theoretical results on the tradeoff between the compression rate, communication complexity of encoding, and the MSE and demonstrate empirical performance of the scheme using simulations. 相似文献
88.
Thalita Marques Passos Lívia Helena Moreira da Silva Leonardo Marmo Moreira Renato Amaro Zângaro Roberto da Silva Santos Fernanda Barrinha Fernandes 《臭氧:科学与工程》2014,36(2):138-143
Giardia spp. is a flagellate protozoan that presents two evolution forms, cysts and trophozoites. Cysts are resistant to chlorine, the most employed disinfectant agent in the treatment of water. For this reason, new techniques for the disinfection of waters that contain this parasite are necessary. This work evaluated the efficiency of the disinfection by ozone and ultrasound individually and simultaneously upon wastewater. The data obtained showed that after application, ozone, ultrasound, and combined techniques induced a significant elimination of Giardia spp. cysts. Furthermore, this effect was more accentuated when the two techniques were applied simultaneously. 相似文献
89.
Maria M Marques Susete Fernandes Sandra G Correia Susana Caroo Pedro T Gomes Alberto R Dias Joo Mano Marvin D Rausch James C
W Chien 《Polymer International》2001,50(5):579-587
Vinyl acetate, methyl methacrylate, acrylonitrile and methyl vinyl ketone were investigated for co‐ and terpolymerization with ethylene and ethylene–propylene. Precursor [bis(N,N ′‐dimesitylimino)acenaphthene]dibromonickel, activated by methylaluminoxane was used as a catalyst system and trialkylaluminium was employed to block the polar groups for these polymerizations. Polymerization activities of the order of magnitude of 106 in the case of vinyl acetate and methyl methacrylate, and 105 in the case of acrylonitrile were achieved. Microanalysis and GPC of acrylonitrile copolymers found about 17 units of acrylonitrile per polymer chain. Copolymers with very different properties from the parent homopolymers were obtained in all cases except that of methyl vinyl ketone. © 2001 Society of Chemical Industry 相似文献
90.
The purpose of these field and lab studies undertaken during rehabilitation work being done on an ancient railway line was to characterize a layer of ballast fouled with soil found in the track substructure. The field studies included the characterization of the thickness, grain size distribution and void ratio of the fouled ballast layer, as well as a large number of plate load tests, both on the fouled ballast layer and on the subgrade. The resilient behaviour of the fouled ballast was evaluated in the lab by cyclic triaxial tests on large size reconstituted specimens with distinct fouling indexes (different grain size distribution) and distinct humidity states (dry or wet). The results obtained were used as support for the decision to maintain the fouled ballast layer under the new sub-ballast in a number of stretches of the renewed line. 相似文献