全文获取类型
收费全文 | 127篇 |
免费 | 2篇 |
专业分类
化学工业 | 3篇 |
机械仪表 | 12篇 |
建筑科学 | 5篇 |
能源动力 | 1篇 |
轻工业 | 86篇 |
无线电 | 2篇 |
一般工业技术 | 9篇 |
冶金工业 | 2篇 |
自动化技术 | 9篇 |
出版年
2022年 | 4篇 |
2021年 | 1篇 |
2018年 | 1篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2013年 | 9篇 |
2012年 | 7篇 |
2011年 | 5篇 |
2010年 | 6篇 |
2009年 | 12篇 |
2008年 | 2篇 |
2007年 | 4篇 |
2006年 | 1篇 |
2004年 | 4篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2001年 | 1篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 9篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1970年 | 1篇 |
1968年 | 2篇 |
1967年 | 2篇 |
1955年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有129条查询结果,搜索用时 234 毫秒
1.
J. M. Criado M. J. Dianez F. Gotor C. Real M. Mundi S. Ramos J. DEL Cerro 《Ferroelectrics Letters Section》1992,14(3):79-84
The Constant Rate Thermal Analysis method has been used under different experimental conditions to obtain barium titanate powder of very small grain size. Both a crystallographic and a dielectric study ham been carried out on samples sintered at different temperatures. It is deduced that the formation of small coherently diffracting domains is improved by the generation of oxygen vacancies and the cubic phase stabilization depends on the coherently diffracting domain size rather than on the particle size. 相似文献
2.
F. R. DEL VALLE H. VILLANUEVA J. REYES-GOVEA M. ESCOBEDO M. J. MUNOZ J. PONCE M. VEGA M. HERNANDEZ G. VELAZQUEZ 《Journal of food science》1985,50(2):551-552
A nitrogen balance study, comparing a low-cost soy-oats infant formula with and without supplemental methionine, was carried out with infants of ages 3 - 26 months at a single equivalent level of nitrogen intake (approximately 850 mg/kg/day). Nitrogen retention was found to be unaffected by methionine supplementation. Com- parison of data obtained in this study with previous research re- vealed that a critical value for intake of total L-sulfur amino acids apparently exists in infants 3 - 26 months of age, below which methionine supplementation will increase nitrogen retention, but above which it will not. This value appears to coincide with that of 49 mg/kg/day recommended for infants by the FNB. 相似文献
3.
WATER ABSORPTION and SWELLING IN DRY BEAN SEEDS 总被引:1,自引:0,他引:1
4.
Heating curves for different locations inside cans of mussels brine, placed in vertical, horizontal and inclined positions, were experimentally determined. Temperature profiles were fitted the response of a second order system to a step input. The location of the slowest heating point was established by comparison of the time constants. The critical heating point was found to be on the axis at one eighth the height of the cans when they were in a vertical position. 相似文献
5.
The development of video applications for digital multimedia has highlighted the need for indexing tools, enabling the access to meaningful segments of video. The high cost of manual indexing creates a demand for the development of automatic algorithms, able to extract such indices with little intervention. In this paper we present new editing model–based algorithms that automatically extract low–level features in a movie: camera shots and camera motion. Rules of film making are used to derive higher-level elements, such as shot-reverse shot sequences. The algorithms have been tested on 20 h of movies and comparison with techniques in the literature is provided. 相似文献
6.
7.
8.
9.