全文获取类型
收费全文 | 206篇 |
免费 | 23篇 |
专业分类
电工技术 | 5篇 |
化学工业 | 82篇 |
金属工艺 | 3篇 |
机械仪表 | 4篇 |
建筑科学 | 4篇 |
能源动力 | 1篇 |
轻工业 | 64篇 |
水利工程 | 3篇 |
石油天然气 | 1篇 |
无线电 | 9篇 |
一般工业技术 | 30篇 |
冶金工业 | 6篇 |
自动化技术 | 17篇 |
出版年
2024年 | 4篇 |
2023年 | 3篇 |
2022年 | 18篇 |
2021年 | 17篇 |
2020年 | 14篇 |
2019年 | 6篇 |
2018年 | 8篇 |
2017年 | 9篇 |
2016年 | 6篇 |
2015年 | 7篇 |
2014年 | 13篇 |
2013年 | 16篇 |
2012年 | 12篇 |
2011年 | 16篇 |
2010年 | 14篇 |
2009年 | 7篇 |
2008年 | 10篇 |
2007年 | 9篇 |
2006年 | 10篇 |
2005年 | 7篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2002年 | 4篇 |
2001年 | 1篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1976年 | 1篇 |
排序方式: 共有229条查询结果,搜索用时 15 毫秒
21.
Bentosela Mariana; Ruetti Eliana; Muzio Rubén N.; Mustaca Alba E.; Papini Mauricio R. 《Canadian Metallurgical Quarterly》2006,120(2):371
Rats given access to a 32% sucrose solution and then downshifted to a 4% solution exhibit less contact with the sipper tube than unshifted controls always given access to 4% solution. This phenomenon, called consummatory successive negative contrast, was facilitated in Experiment 1 by a posttrial injection of corticosterone (3 mg/kg) administered immediately after the first downshift trial. Experiment 2 demonstrated that this facilitatory effect of posttrial corticosterone does not occur when administered 3 hr after the first downshift trial. These results support the hypothesis that corticosterone strengthens an aversive emotional component elicited by the surprising downshift in reward magnitude during the initial downshift trial. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
22.
Plasmonic Nanostructures: 3D Nanostar Dimers with a Sub‐10‐nm Gap for Single‐/Few‐Molecule Surface‐Enhanced Raman Scattering (Adv. Mater. 15/2014)
下载免费PDF全文
![点击此处可从《Advanced materials (Deerfield Beach, Fla.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
23.
Sebastian J. Cobos J.A. Lopera J.M. Uceda U. 《Power Electronics, IEEE Transactions on》1995,10(5):574-582
The determination of the boundaries between both modes of conduction (continuous and discontinuous) in PWM DC-to-DC switching power converters used as power factor preregulators (PFP) is presented in this paper. When a DC-to-DC switching power converter works as a power factor preregulator, its operating point is constantly changing due to the fact that both the DC voltage conversion ratio and the load “seen” by the power converter are constantly changing in each half-sinusoid of the line voltage (input voltage of the converter). In these conditions, the conduction mode cannot be directly determined. In this paper, the boundaries between both conduction modes in each angle of the half-sinusoidal input voltage have been determined. The conditions to always operate in continuous or in discontinuous conduction modes have been determined as well. Finally, these results have been verified by simulations and experimental results 相似文献
24.
Diaz J. Nuno F. Lopera J.M. Martin-Ramos J.A. 《Industrial Electronics, IEEE Transactions on》2004,51(4):850-856
Piezoelectric transformers (PTs) are an attractive solution to reduce size and weight in ac/dc converters. In this paper, a PT-based topology is presented together with a control method. As an application, an 8-W ac/dc adapter (110 V/sub AC/ input, 12 V/sub DC/ output) is presented operating at frequencies around 500 kHz. 相似文献
25.
Lopera J.M. Fernandez F.M. Diaz J. Prieto M.J. Pernia A.M. 《Industry Applications Magazine, IEEE》2002,8(2):34-38
Galvanic steel wire manufacturers have to fulfill several international regulations regarding zinc mass by surface unit. This article presents a new sensor to measure this parameter online. Details about the different parts of the system (sensor, circuitry, adjustment, and signal processing) are explained. Experimental results in a real manufacturing line are also presented. Online measurement conserves zinc mass and guarantees savings 相似文献
26.
Eliana Minicozzi 《Theoretical computer science》1976,2(3):345-360
In this paper the problem of inducing an algorithm for a partial recursive function from the analysis of its graph or loosely speaking of “learning” it, is discussed.A certain number of results are obtained mainly relatively to the question of whether, given a machine M able to learn all functions within a set C, one can construct a machine M' able to learn a new set C' related in some “natural” way to C, by using the experience of M. 相似文献
27.
Projection of transmembrane helices using a Uniform B-spline Algorithm is a tool for the visualization of interactions between helices in membrane proteins. It allows the user to generate projections of 3D helices, no matter what their deviations from a canonical helix might be. When associated with adapted coloring schemes it facilitates the comprehension of helix-helix interactions. Examples of transmembrane proteins were chosen to illustrate the advantages that this method provides. In the glycophorin A dimer we can easily appreciate the structural features behind homodimerisation. Using the structure of the fumarate reductase we analyze the contact surfaces inside a helical bundle and thanks to structures from a molecular dynamics simulation we see how modifications in structure and electrostatics relate to their interaction. We propose the use of this tool as an aid to the visualization and analysis of transmembrane helix surfaces and properties. 相似文献
28.
Valentina Vasta Eliana Jerónimo Daniela M.R. Brogna Maria T.P. Dentinho Luisa Biondi José Santos-Silva Alessandro Priolo Rui J.B. Bessa 《Food chemistry》2010
Thirty-six Merino Branco lambs were assigned to six dietary treatments: control diet (C) consisting of 90% dehydrated lucerne and 10% wheat bran; control diet with 6% of oil blend (CO); control with 2.5% of grape seed extract (GS); control with 2.5% of grape seed extract and 6% of oil blend (GSO); control with 25% of Cistus ladanifer (an aromatic bush widespread in Portugal; CL); control with 25% of C. ladanifer and 6% of oil blend (CLO). The muscle longissimus dorsi was then subjected to the analysis of volatile compounds (SPME–GC/MS). The CLO diet increased the concentration of heptanal, 3-hydroxy-2-butanone and 2-ethyl-phenol in muscle compared to the CL diet. When lambs received the CL diet, their meat contained lower amounts of 4-heptenal compared to the other treatments. The meat of the GS and GSO lambs contained similar amounts of volatile compounds deriving from lipid oxidation (such as heptanal, 2-nonenal, 4-heptenal and 3-hydroxy-2-butanone). These results indicate that in the presence of grape seed extract, oil supplementation did not enhance the production of lipid-derived volatile compounds. Verbenone and 2,2,6-trimethyl-cyclohexanone were detected only in the meat of the Cistus-fed lambs, suggesting that these compounds could be markers of feeding Cistus-containing diets. Meat volatile compounds profile allowed to discriminate between the lambs receiving C. ladanifer and those not receiving this bush in the diet. 相似文献
29.
Nadia Chlibi José P.B. Silva Eliana M.F. Vieira Luís M. Goncalves Joaquim Agostinho Moreira Adil Chahboun Hassen Dahman Mário Pereira Maria J.M. Gomes Lassaad El Mir 《Ceramics International》2021,47(16):22594-22603
Spin-coated chalcostibite CuSbS2 thin films (≈500 nm thick) were fabricated and the influence of the drying temperature on the structural, morphological, optical and thermoelectric properties of the films was investigated. Crystalline phase-pure chalcostibite has been obtained for the films dried at 180 °C and 210 °C, while below 180 °C these films are partially amorphous. Surprisingly, at drying temperature of 240 °C, a CuxS secondary phase appeared. The increase of the drying temperature leads to the increase of the particle size and the decrease of the optical band gap, which is interesting for optoelectronic applications. The highest power factor value was achieved for the film dried at 210 °C, due to the inexistence of secondary phases, which allowed realizing a stable thermoelectric touch sensor with a Vsignal/noise of 5. In addition, this film was tested as a photovoltaic (PV) device and a power conversion efficiency (PCE) of 0.030% with an open-circuit voltage (VOC) of 0.36 V, a short-circuit current density (JSC) of 0.278 mAcm?2 and a fill factor (FF) of 0.27 were obtained. Therefore, this work evidences a pathway toward developing bi-functional devices with simultaneously thermoelectric touch sensor and photovoltaic functions. 相似文献
30.
Thiago Rocha dos Santos Mathias Vernica Marinho Fontes Alexandre Magali Christe Cammarota Pedro Paulo Moretzsohn de Mello Eliana Flvia Camporese Srvulo 《Journal of the Institute of Brewing》2015,121(3):400-404
Agro‐industrial wastes are produced in large quantities around the world from the processing and manufacturing of food and beverages. The disposal of these wastes into the environment leads to damage to ecosystems owing to their composition rich in organic matter. In this context it may be noted that the brewing industry, whose production process includes processing steps and fermentation of vegetable raw materials such as barley and/or other grains used as adjuncts and hops, generates various byproducts. The worldwide consumption of these beverages and the current model of breweries, which includes production on a large scale, lead to the generation of large amounts of brewery waste, namely spent grain, hot trub and residual yeast. Owing to its composition, these residues exhibit significant potential for application in bioprocess technologies. In this study the three residues mentioned had their composition determined as a function of moisture, ash, total organic carbon (TOC), total and soluble nitrogen, reducing sugar and soluble free amino nitrogen. Moreover, the residues were characterized for total acidity, pH and chemical oxygen demand (COD) of total and soluble fractions. The three residues evaluated had high moisture content (>80%) and high organic matter content (TOC and COD, ~50% and >1000 mg/g, respectively), which can highlights the significant protein fraction (almost 50% for hot trub and residual yeast), suggesting the possibility of using these wastes for recovery. Copyright © 2015 The Institute of Brewing & Distilling 相似文献