全文获取类型
收费全文 | 449篇 |
免费 | 29篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 10篇 |
综合类 | 14篇 |
化学工业 | 44篇 |
金属工艺 | 2篇 |
机械仪表 | 7篇 |
建筑科学 | 45篇 |
矿业工程 | 1篇 |
能源动力 | 17篇 |
轻工业 | 220篇 |
水利工程 | 7篇 |
石油天然气 | 4篇 |
无线电 | 4篇 |
一般工业技术 | 25篇 |
冶金工业 | 39篇 |
原子能技术 | 2篇 |
自动化技术 | 39篇 |
出版年
2024年 | 2篇 |
2023年 | 4篇 |
2022年 | 8篇 |
2021年 | 18篇 |
2020年 | 15篇 |
2019年 | 12篇 |
2018年 | 19篇 |
2017年 | 9篇 |
2016年 | 14篇 |
2015年 | 22篇 |
2014年 | 20篇 |
2013年 | 28篇 |
2012年 | 25篇 |
2011年 | 29篇 |
2010年 | 20篇 |
2009年 | 25篇 |
2008年 | 18篇 |
2007年 | 33篇 |
2006年 | 19篇 |
2005年 | 14篇 |
2004年 | 19篇 |
2003年 | 8篇 |
2002年 | 20篇 |
2001年 | 7篇 |
2000年 | 5篇 |
1999年 | 4篇 |
1998年 | 4篇 |
1997年 | 6篇 |
1996年 | 8篇 |
1995年 | 5篇 |
1994年 | 8篇 |
1993年 | 6篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1972年 | 1篇 |
1969年 | 1篇 |
1962年 | 1篇 |
排序方式: 共有480条查询结果,搜索用时 468 毫秒
31.
Thazhakot V Sankar Alappat Ramachandran 《Journal of the science of food and agriculture》2002,82(9):1021-1027
The gel strength, compressibility and folding characteristic of suwari (set) and kamaboko (set and cooked) gels prepared from rohu ( Labeo rohita ), catla ( Catla catla ) and mrigal ( Cirrhinus mrigala ) surimi were examined to understand the occurrence of suwari and modori phenomena in surimi from major freshwater carps. Suwari setting of gels did not take place at lower temperatures. Suwari gels showed good gel strength at 50 °C for rohu and at 60 °C for catla and mrigal after 30 min setting time. Incubation for 60 min decreased the gel strength at 60 °C for rohu and catla. Setting at 25 °C followed by cooking at 90 °C increased the gel strength. Increased setting temperature, however, decreased the gel strength of cooked gels. Gel strength and compressibility data were supported by folding characteristics. © 2002 Society of Chemical Industry 相似文献
32.
33.
《分离科学与技术》2012,47(12):1838-1847
Defatted seed meals, the byproducts of Indian mustard seed oil industry, which are just used as animal feedstock and nitrogen fertilizers, possess various nutrients and phytochemical compounds, such as sinigrin and gluconapin. The present study demonstrated a novel, low-cost, and efficient method for the co-production of sinigrin and gluconapin from defatted Indian mustard seed meals by D261 strong basic anion-exchange macroporous resin and medium pressure liquid chromatography (MPLC). The adsorption/desorption capacities of eight adsorbents characterized by BET, IR, and EDS were screened. 26.4 g defatted Indian mustard seed meals, which contained about 1210.3 mg sinigrin and 696.6 mg gluconapin, could produce 2059.6 mg of glucosinolate-rich extract of 53.67% sinigrin and 31.30% gluconapin after separation by D261 resin. Then, 949.40 mg of 97% sinigrin and 568.40 mg of 95% gluconapin could be obtained after the extracts were purified by MPLC, with the recovery of 76.03% of sinigrin and 77.38% of gluconapin. The products were assessed by analytical HPLC and characterized by UV, MS, 1H NMR, and 13C NMR. In conclusion, this method is practical and environmentally friendly, and it is a low-cost process to make full use of Indian mustard seeds. 相似文献
34.
İlknur Uçak Yesim Özogul Mustafa Durmuş 《International Journal of Food Science & Technology》2011,46(6):1157-1163
The effects of the use of antioxidant technology on the quality of mackerel burgers stored at 4 °C were investigated in terms of sensory, biochemical [thiobarbituric acid (TBA), total volatile basic nitrogen (TVB‐N), peroxide value (PV) and free fatty acids (FFA)] and microbiological analyses [total viable count (TVC)]. Fish meat was divided into three groups; the control (C) without rosemary extract, the second group with 0.4% rosemary extracts (Group A) and the third with 0.8% rosemary extracts (Group B). Results showed that the TVB‐N level did not exceed acceptability limit (30–35 mg 100 g?1) for all groups. TBA value for the control significantly increased from 1.47 to 4.80 MA kg?1 whereas it slightly increased in treatment groups as the storage time increased. Significantly higher PV and FFA (P < 0.05) were obtained from the control group. Rosemary extract, in combination with vacuum pack was effective in controlling the growth of bacteria and biochemical indices. 相似文献
35.
ABSTRACT: To improve the quality of fish muscle, mackerel muscle protein was hydrolyzed by proteases from Aspergillus oryzae , and then fermented by lactic acid bacteria (LAB). The highest protease activities were obtained from A. oryzae after 72 h incubation at 25°C. Acidic protease activity was much higher than neutral and alkaline proteases. SDS-PAGE indicated the degradation of muscle proteins after 1 or 2 h hydrolysis by A. oryzae proteases at 50°C. During 48 h fermentation by Pediococcus pentosaceus L and S at 37°C, rapid growth of LAB, decline in pH, and suppression in the growth of microflora, Enterobacteriaceae, Staphylococcus , and Pseudomonas , occurred while increases in whiteness, nonprotein nitrogen, sensory quality, and free amino acids were observed. These data suggested that the acceptability of LAB -fermented mackerel hydrolysates could be substantially improved. 相似文献
36.
C. T. Hou M. O. Bagby R. D. Plattner S. Koritala 《Journal of the American Oil Chemists' Society》1991,68(2):99-101
Sixty-two cultures from the Agricultural Research Service (ARS) Culture Collection and 10 cultures isolated from soil and
water samples in Illinois were screened for their ability to convert agricultural oils to value-added industrial chemicals.
A new compound, 7,10-dihydroxy-8(E)-octadecenoic acid (DOD), was produced from oleic acid at a yield of greater than 60% by
bacterial strain PR3 which was isolated from a water sample in Morton, IL. To our knowledge, DOD has not been previously reported.
The optimum time, pH and temperature for the production of DOD were 2 days, 7.0, and 30°C, respectively. The production of
DOD is unique in that it involves hydroxylation at two positions and rearrangement of the double bond of the substrate molecule. 相似文献
37.
It is well-accepted that firms locate in clusters to benefit from spillover effects from similar firms in the location. However, some firms choose to locate in multiple clusters. In this paper, we focus on the phenomenon of multi-cluster presence. Through an empirical investigation of 95 firms from the information technology enabled service industry within India, we analyze the drivers of membership across multiple clusters. Our findings indicate first that firms that are located in lower density clusters show a tendency to locate in a larger number of clusters. Second, firms that are looking for people-based creative capabilities also tend to locate in a larger number of clusters. Finally, the firms that are not founded at the location of ethnic origin of the founder CEO also tend to locate in a larger number of clusters. 相似文献
38.
39.
Hawkins Elizabeth H.; Cummins Lillian H.; Marlatt G. Alan 《Canadian Metallurgical Quarterly》2004,130(2):304
Substance abuse has had profoundly devastating effects on the health and well-being of American Indians and Alaska Natives. A wide variety of intervention methods has been used to prevent or stem the development of alcohol and drug problems in Indian youth, but there is little empirical research evaluating these efforts. This article is an overview of the published literature on substance use prevention among Indian adolescents, providing background epidemiological information, a review of programs developed specifically for Indian adolescents, and recommendations for the most promising prevention strategies currently in practice. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
40.
ABSTRACT: The stress-relaxation and nuclear magnetic resonance (NMR) proton spin-spin relaxation time (1 H T2 ) measurements were performed to elucidate the gelation mechanism of heated and pressurized surimi gels. Numerical inverse Laplace transformation of the stress-relaxation data showedlarge distributions of stress-relaxation times and the Kohlrauch-Williams-Watts (KWW) equation described well the stress-relaxation process for each gel. NMR measurement gave information about the content of the exposed protein surface. From these results it is considered that the heat treatment induces the denaturation and re-aggregation of protein, which contribute to the formation of strong network structure. On the other hand, the pressure treatment contributes to the formation of weak cross-links made by the aggregation of protein in native form. 相似文献