全文获取类型
收费全文 | 1320篇 |
免费 | 14篇 |
专业分类
电工技术 | 10篇 |
综合类 | 4篇 |
化学工业 | 152篇 |
金属工艺 | 41篇 |
机械仪表 | 32篇 |
建筑科学 | 35篇 |
矿业工程 | 9篇 |
能源动力 | 69篇 |
轻工业 | 141篇 |
水利工程 | 5篇 |
石油天然气 | 8篇 |
无线电 | 55篇 |
一般工业技术 | 191篇 |
冶金工业 | 457篇 |
原子能技术 | 8篇 |
自动化技术 | 117篇 |
出版年
2021年 | 16篇 |
2019年 | 11篇 |
2018年 | 13篇 |
2017年 | 17篇 |
2016年 | 7篇 |
2015年 | 8篇 |
2014年 | 25篇 |
2013年 | 42篇 |
2012年 | 32篇 |
2011年 | 37篇 |
2010年 | 34篇 |
2009年 | 40篇 |
2008年 | 35篇 |
2007年 | 45篇 |
2006年 | 46篇 |
2005年 | 37篇 |
2004年 | 39篇 |
2003年 | 31篇 |
2002年 | 27篇 |
2001年 | 26篇 |
2000年 | 22篇 |
1999年 | 23篇 |
1998年 | 98篇 |
1997年 | 60篇 |
1996年 | 49篇 |
1995年 | 27篇 |
1994年 | 23篇 |
1993年 | 33篇 |
1992年 | 15篇 |
1991年 | 20篇 |
1990年 | 19篇 |
1989年 | 29篇 |
1988年 | 20篇 |
1987年 | 18篇 |
1986年 | 28篇 |
1985年 | 29篇 |
1984年 | 13篇 |
1983年 | 16篇 |
1982年 | 12篇 |
1981年 | 20篇 |
1980年 | 19篇 |
1979年 | 16篇 |
1978年 | 21篇 |
1977年 | 13篇 |
1976年 | 34篇 |
1975年 | 8篇 |
1974年 | 12篇 |
1973年 | 10篇 |
1972年 | 9篇 |
1971年 | 13篇 |
排序方式: 共有1334条查询结果,搜索用时 15 毫秒
1.
Effect of gums on viability and β‐galactosidase activity of Lactobacillus spp. in milk drink during refrigerated storage 下载免费PDF全文
Bernice D. Karlton‐Senaye Reza Tahergorabi Valerie L. Giddings Salam A. Ibrahim 《International Journal of Food Science & Technology》2015,50(1):32-40
The viability and β‐galactosidase activity of four Lactobacillus strains in milk drink containing gums during 28 days of refrigerated storage at 4 °C were assessed. The population of Lactobacillus rhamnosus GGB101 and Lactobacillus rhamnosus GGB103 were maintained, whereas the population of Lactobacillus reuteri DSM20016 and Lactobacillus reuteri SD2112 significantly decreased. The recommended level of 6 log CFU g?1 was exceeded for all tested trains throughout storage. The highest viable number of Lactobacillus rhamnosus GGB103 (8.76 ± 0.03 log CFU mL?1) was obtained in the product containing carrageenan–maltodextrin. The addition of guar–locust bean–carrageenan led to 20‐fold increase in the level of β‐galactosidase activity for L. rhamnosus GGB101 (1208 ± 2.12 Miller units mL?1) compared to the control (61 ± 2.83 Miller units mL?1). Our results suggested that gums could be added to milk to improve viability and enhance β‐galactosidase activity of Lactobacillus. 相似文献
2.
There will always be a premium on innovation and original approaches to old problems. Engineers and designers are constantly urged to think outside the box. In space shuttle technician Arlene S. Reese's case, she decided to think outside the world of traditional, 2D drafting. Working under tough deadline pressures for a shuttle lighting installation project, Reese and her design team decided to blend digital photographs and 3D assemblies to show other contractors precisely where and how the job should be built. The result was a faster, more effective method for planning electrical projects that has earned awards for her team and continues to produce benefits for the National Aeronautics and Space Administration (NASA). Reese and the managers at NASA say the design method can apply to many architectural and engineering disciplines. 相似文献
3.
David Mills 《Granular Matter》2004,6(2-3):173-177
For fine powdered materials, capable of being conveyed in dense phase, a conveying region exists in which instability in flow and pipeline blockage can occur if the pressure gradient available is insufficient to maintain a minimum value of solids loading ratio. A reduction in material flow rate can also lead to pipeline blockage in this region. Conveying trials under-taken with cement are used to illustrate the nature of the problem. 相似文献
4.
5.
Domjan Michael; Mahometa Michael J.; Mills Andrew D. 《Canadian Metallurgical Quarterly》2003,117(4):391
Two contrasting investigative techniques provided evidence consistent with the interpretation that female quail (Coturnix japonica) regulate male copulatory behavior by the duration of their immobility and through this behavioral mechanism they also control the rate of fertilization of their eggs. In Experiment 1, copulation tests with males and females from different genetic lines showed that the type of female that participated in a copulatory test significantly influenced the latency of the male's grab, mount, and cloacal contact responses and also determined the efficiency of the male's copulatory behavior. These measures of male performance were correlated with female immobility in Experiment 2, which used a more homogeneous population of quail. Furthermore, 2 of these measures (copulatory efficiency and the latency to make cloacal contact) were correlated with fertilization rate. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
6.
7.
8.
9.
10.
V. Sinha M. J. Mills J. C. Williams 《Metallurgical and Materials Transactions A》2004,35(10):3141-3148
This article presents the results of a recent study of the response of an α/β-forged Ti-6Al-2Sn-4Zr-2Mo alloy during static, normal-fatigue, and dwell-fatigue loading. The plastic-strain accumulation
under different loading conditions is reported. The failure modes and associated fractographic features under static, normal-fatigue,
and dwell-fatigue loading conditions are also discussed. These results are used to obtain a better understanding of the relative
contributions of the cyclic and creep processes to the overall damage under dwell-fatigue conditions. 相似文献