全文获取类型
收费全文 | 328篇 |
免费 | 26篇 |
国内免费 | 2篇 |
学科分类
工业技术 | 356篇 |
出版年
2024年 | 3篇 |
2023年 | 9篇 |
2022年 | 13篇 |
2021年 | 19篇 |
2020年 | 24篇 |
2019年 | 18篇 |
2018年 | 26篇 |
2017年 | 18篇 |
2016年 | 22篇 |
2015年 | 11篇 |
2014年 | 21篇 |
2013年 | 31篇 |
2012年 | 24篇 |
2011年 | 14篇 |
2010年 | 26篇 |
2009年 | 14篇 |
2008年 | 11篇 |
2007年 | 13篇 |
2006年 | 9篇 |
2005年 | 4篇 |
2004年 | 4篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 6篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1986年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有356条查询结果,搜索用时 15 毫秒
21.
Esra Evrim Yalçınkaya Füsun Okçu Pelit İmran Güney Hayati Türkmen 《Journal of Porous Materials》2014,21(6):1151-1158
In this study, the preparation and characterization of ionic liquid (IL) intercalated montmorillonite (MMT) and their application as a micro-solid phase extraction material for the determination of Chlorpyrifos (CP) pesticide in water samples were reported. The ionic liquids bearing different chain lengths [1-methyl-3-octylimidazolium bromide (C8mimBr), 1-methyl-3-undecyl-imidazolium bromide (C12mimBr) and 1-methyl-3-octadecyl-imidazolium bromide (C18mimBr)] were intercalated in the galleries of MMT. The IL-intercalated MMTs were characterized by means of XRD and TG methods. The (C12mimBr)-intercalated MMT had the highest sorption efficiency for the CP, which was 32 times higher than the original MMT. We also optimized the parameters for extracting CP from the (C12mimBr)-intercalated MMT. 相似文献
22.
This work is concerned with the use of aminolysis, aminoglycolysis, and simultaneous aminolysis–hydrolysis products of waste PET for production of paint binder based on alkyd resin. For this purpose, first, aminolysis, aminoglycolysis, and simultaneous hydrolysis–aminolysis reactions of waste PET were carried out in the presence of different chemical agents in xylene medium at high pressures. Reactions of waste PET flakes obtained from grinding postconsumer water bottles were carried out in an autoclave at higher temperatures. Then, four alkyd resins, formulated to have oil content 40–50%, were prepared using these depolymerization products. One of resins is “reference alkyd resin” which was prepared by using soybean oil fatty acid, phthalic anhydride, glycerine, and ethylene glycol for comparison. Other three alkyds are “depolymerization product‐based alkyd resins” in which depolymerization products is used instead of ethylene glycol. Then, the physical and chemical surface coating properties and thermal behaviors of alkyd resins films were investigated comparatively. As a result, we concluded that aminolysis, aminoglycolysis, and simultaneous aminolysis‐hydrolysis products of waste PET are suitable for manufacturing both air drying and oven curing paint binder based on alkyd resins. The film prepared from alkyd resin based on simultaneous aminolysis‐hydrolysis product showed extremely good surface coating properties and thermal stability. POLYM. ENG. SCI., 54:2272–2281, 2014. © 2013 Society of Plastics Engineers 相似文献
23.
24.
Food quality is directly linked to the food's appearance, texture and flavor. All three components must be in harmony for the food to be considered delicious. Understanding how various textures can be designed requires a comprehensive approach of evaluating food structure, oral processing and sensory evaluation. Oral processing considers the physiological processes in first bite, mastication and swallowing. Sensory stimuli during oral processing are used to determine the acceptance of texture. Recent research has focused on how milk proteins can be used to create desirable textures. Whey protein–polysaccharide mixtures were used to show how microstructure can be manipulated to produce a range of textures and control water release. The importance of microstructure in determining a variety of texture terms was demonstrated in whey protein emulsion gels. Finally, fat content in Cheddar cheese was shown to be critical to producing a desirable breakdown pattern. These and other applications will be discussed. 相似文献
25.
26.
The purpose of this study was to evaluate the knowledge, attitudes and practices among food service staff with regards to food hygiene in hospitals in Edirne, Turkey, and to provide baseline data for implementing HACCP in hospital food services by carrying out a questionnaire by a face-to-face interview. The current study shows that food service staff in Edirne hospitals have insufficient knowledge regarding the basics of food hygiene. And also revealed a discrepancy between attitudes and practices towards food hygiene. There is an immediate need for continuous training among food handlers regarding safe food handling practices. 相似文献
27.
The art of mosaic has arisen thousands of years ago. Despite all those years and all the attention it has received till today, mosaic tiling is still being carried out manually and mosaic tiling processes have never been changed except the tool and material developments. 相似文献
28.
A control system that contains a generic plant has been built. Its controller parameters have been designed by using a global search algorithm for a given plant, and its performance has been evaluated for the heat control of a thermal system, and the speed control of a DC motor. This paper explains this control system with a DC motor as its plant, the speed of which is controlled by the controller. 相似文献
29.
Daniel R. Brooks Esra Erdem Selim T. Erdoğan James W. Minett Don Ringe 《Journal of Automated Reasoning》2007,39(4):471-511
We describe the reconstruction of a phylogeny for a set of taxa, with a character-based cladistics approach, in a declarative
knowledge representation formalism, and show how to use computational methods of answer set programming to generate conjectures
about the evolution of the given taxa. We have applied this computational method in two domains: historical analysis of languages
and historical analysis of parasite-host systems. In particular, using this method, we have computed some plausible phylogenies
for Chinese dialects, for Indo-European language groups, and for Alcataenia species. Some of these plausible phylogenies are different from the ones computed by other software. Using this method, we
can easily describe domain-specific information (e.g., temporal and geographical constraints), and thus prevent the reconstruction
of some phylogenies that are not plausible.
This paper is a revised and extended version of [3]. 相似文献
30.