全文获取类型
收费全文 | 1616篇 |
免费 | 118篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 25篇 |
综合类 | 3篇 |
化学工业 | 313篇 |
金属工艺 | 36篇 |
机械仪表 | 37篇 |
建筑科学 | 49篇 |
矿业工程 | 2篇 |
能源动力 | 62篇 |
轻工业 | 393篇 |
水利工程 | 24篇 |
石油天然气 | 14篇 |
无线电 | 95篇 |
一般工业技术 | 210篇 |
冶金工业 | 274篇 |
原子能技术 | 16篇 |
自动化技术 | 182篇 |
出版年
2024年 | 2篇 |
2023年 | 10篇 |
2022年 | 26篇 |
2021年 | 53篇 |
2020年 | 42篇 |
2019年 | 54篇 |
2018年 | 68篇 |
2017年 | 57篇 |
2016年 | 61篇 |
2015年 | 49篇 |
2014年 | 70篇 |
2013年 | 97篇 |
2012年 | 90篇 |
2011年 | 96篇 |
2010年 | 68篇 |
2009年 | 64篇 |
2008年 | 87篇 |
2007年 | 56篇 |
2006年 | 58篇 |
2005年 | 56篇 |
2004年 | 49篇 |
2003年 | 32篇 |
2002年 | 30篇 |
2001年 | 26篇 |
2000年 | 32篇 |
1999年 | 41篇 |
1998年 | 102篇 |
1997年 | 64篇 |
1996年 | 29篇 |
1995年 | 33篇 |
1994年 | 14篇 |
1993年 | 17篇 |
1992年 | 9篇 |
1991年 | 14篇 |
1990年 | 7篇 |
1989年 | 7篇 |
1988年 | 13篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1983年 | 5篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1978年 | 3篇 |
1977年 | 4篇 |
1976年 | 9篇 |
1975年 | 4篇 |
1974年 | 1篇 |
排序方式: 共有1735条查询结果,搜索用时 140 毫秒
61.
62.
Dayana Pereira de Andrade Cíntia Lacerda Ramos Diego Alvarenga Botrel Soraia Vilela Borges Rosane Freitas Schwan Disney Ribeiro Dias 《International Journal of Food Science & Technology》2019,54(7):2355-2362
The probiotic strains Lactobacillus brevis CCMA1284 and Lactobacillus plantarum CCMA0359 were microencapsulated by spray drying using different matrices – whey powder (W), whey powder with inulin (WI) and whey powder with maltodextrin (WM). Viability of the microencapsulated strains in acid and bile juices and during 90 days of storage (seven and 25 °C) was evaluated. The two strains exhibited high encapsulation efficiency (> 86%) by spray drying. The different matrices maintained L. plantarum viability above six log CFU g−1 at 7 °C for 90 days, whereas similar results for L. brevis were observed only for W. The use of inulin as matrix of encapsulation did not enhance bacterial viability in the evaluated conditions. In general, the use of W and WM as matrices was effective for L. plantarum viability. However, only W was effective for L. brevis in the evaluated conditions. The spray drying technique was successfully adopted for the encapsulation of L. plantarum CCMA0359 and L. brevis CCMA1284 strains. 相似文献
63.
Elizabeth Manning Luís F. Ramos Francisco M. Fernandes 《Journal of Nondestructive Evaluation》2016,35(3):43
This paper presents the continued development of a novel non-destructive testing method termed tube-jack testing. The goal of the tube-jack system is to provide an enhanced and less destructive method than traditional flat-jack testing for determination of mechanical characteristics and local stress states in irregular masonry walls. Single tube-jack tests were performed, using previously developed rubber tube-jacks, in regular masonry walls of granite and cement-lime mortar. A traditional flat-jack test was also performed in the same masonry wall. Conclusions suggest that tube-jacks are successful in applying pressure to the masonry at low stress states. 相似文献
64.
65.
Managing the geometry of a 3D scene efficiently is a key aspect of an interactive 3D application. This aspect is more important if we target at portable devices, which have limited hardware capabilities. Developing new means for improving the interaction with 3D content in mobile devices is key. The aim of this work is to present a technique which can manage the level-of-detail of 3D meshes in portable devices. This solution has been devised considering the restrictions that this kind of devices poses. The results section shows how the integration has been successful while obtaining good performance. 相似文献
66.
67.
Ben‐Hur Ramos Ferreira Gonçalves Grazielly de Jesus Silva Silvania Farias Oliveira Pontes Rafael da Costa Ilhéu Fontan Antonio Silvio do Egito Sibelli Passini Barbosa Ferrão 《International Journal of Food Science & Technology》2016,51(7):1586-1593
Electrophoretic and chromatographic techniques were used to determine water‐soluble peptide profiles aiming to identify the adulteration of buffalo milk mozzarella cheese by the addition of cow's milk. Thus, cheeses were produced with contents of cow's milk varying from 0% to 100%, and the peptides extracted after production and after 20 days of refrigeration. Polyacrylamide gel electrophoresis under denaturing conditions in the presence of sodium dodecyl sulphate (SDS‐PAGE) identified a potential peptide marker of exclusively bovine origin with a size of about 21 kDa for the addition of cow's milk above 30%. Reverse‐phase high‐performance liquid chromatography (RP‐HPLC) indicated the existence of two potential peptides present in higher concentrations in buffalo milk and one exclusive for cow's milk, the latter making it possible to estimate the addition of cow's milk to buffalo milk. Six commercial brands of buffalo mozzarella cheese were evaluated, and indications of adulteration found in four of them. 相似文献
68.
69.
Oscar L. Ramos Ricardo N. Pereira Artur Martins Rui Rodrigues Clara Fuciños José A. Teixeira 《Critical reviews in food science and nutrition》2017,57(7):1377-1393
Whey proteins are widely used as nutritional and functional ingredients in formulated foods because they are relatively inexpensive, generally recognized as safe (GRAS) ingredient, and possess important biological, physical, and chemical functionalities. Denaturation and aggregation behavior of these proteins is of particular relevance toward manufacture of novel nanostructures with a number of potential uses. When these processes are properly engineered and controlled, whey proteins may be formed into nanohydrogels, nanofibrils, or nanotubes and be used as carrier of bioactive compounds. This review intends to discuss the latest understandings of nanoscale phenomena of whey protein denaturation and aggregation that may contribute for the design of protein nanostructures. Whey protein aggregation and gelation pathways under different processing and environmental conditions such as microwave heating, high voltage, and moderate electrical fields, high pressure, temperature, pH, and ionic strength were critically assessed. Moreover, several potential applications of nanohydrogels, nanofibrils, and nanotubes for controlled release of nutraceutical compounds (e.g. probiotics, vitamins, antioxidants, and peptides) were also included. Controlling the size of protein networks at nanoscale through application of different processing and environmental conditions can open perspectives for development of nanostructures with new or improved functionalities for incorporation and release of nutraceuticals in food matrices. 相似文献
70.
A. J. Cavaleiro A. S. Ramos R. M. S. Martins C. Baetz M. T. Vieira F. M. Braz Fernandes 《Journal of Materials Engineering and Performance》2014,23(7):2446-2449
Joining shape-memory alloys (SMA) to other materials is strongly required in order to enlarge their fields of application. Fusion welding induces strong compositional and microstructural changes that significantly affect the shape-memory effect and the superelastic behavior of these alloys. The exothermic and in some cases self-propagating character of some nano-multilayer reactions is explored in this study as an alternative for joining SMA. To follow these very fast reactions, high brilliance sources, such as synchrotron radiation, are required. In situ high-resolution x-ray diffraction data, giving the phase evolution sequence with temperature of the Ni/Ti multilayer thin films under study, are presented. A correlation between the multilayer design and the tendency for the sequence of phase formation is established. 相似文献