全文获取类型
收费全文 | 524篇 |
免费 | 52篇 |
国内免费 | 3篇 |
专业分类
综合类 | 17篇 |
化学工业 | 75篇 |
金属工艺 | 1篇 |
机械仪表 | 4篇 |
建筑科学 | 3篇 |
能源动力 | 2篇 |
轻工业 | 453篇 |
水利工程 | 3篇 |
石油天然气 | 2篇 |
无线电 | 1篇 |
一般工业技术 | 15篇 |
冶金工业 | 1篇 |
自动化技术 | 2篇 |
出版年
2024年 | 8篇 |
2023年 | 13篇 |
2022年 | 23篇 |
2021年 | 32篇 |
2020年 | 20篇 |
2019年 | 30篇 |
2018年 | 11篇 |
2017年 | 21篇 |
2016年 | 24篇 |
2015年 | 24篇 |
2014年 | 25篇 |
2013年 | 31篇 |
2012年 | 49篇 |
2011年 | 34篇 |
2010年 | 22篇 |
2009年 | 30篇 |
2008年 | 19篇 |
2007年 | 17篇 |
2006年 | 27篇 |
2005年 | 19篇 |
2004年 | 12篇 |
2003年 | 14篇 |
2002年 | 3篇 |
2001年 | 6篇 |
2000年 | 4篇 |
1999年 | 11篇 |
1998年 | 8篇 |
1997年 | 7篇 |
1996年 | 6篇 |
1995年 | 8篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 5篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1985年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有579条查询结果,搜索用时 15 毫秒
1.
This study aimed to know the effect of adding pulp in rambutan fruit juice on the characteristics of rambutan juice during storage. Research using the CRD, the treatment were kind of pulp (mandarin and rambutan) and pulp concentration (5%, 7.5%, and 10%). The results showed that the addition of pulp significantly affect the characteristics of rambutan juice (pH, vitamin C, total acid) during storage. Pulpy juice with the most prefered was addition of rambutan pulp as much as 7.5% (w/v) and the addition of citrus pulp as much as 7.5% (w/v) with the score of 3-4 (moderate like - like). 相似文献
2.
E.R. Weiss R.J. Braddock R.M. Goodrich J.F. Gregory III J. Pika 《Journal of food science》2003,68(6):2146-2149
ABSTRACT: Screening commercial cold-pressed oils revealed the presence of terpene chlorohydrins, which may have quality and safety implications for end-users. Concentrations of (1R, 2R, 4R)-2-chloro-8- p -menthen-1-ol in some citrus essential oils ranged from less than 1 to 140 ppm. More than half of the oils tested contained less than 2 ppm of (1R, 2R, 4R)-2-chloro-8- p -menthen-1-ol. A pilot plant study used different concentrations of chlorinated water during the oil-recovery process. Cold-pressed oil, produced from a 30-ppm chlorine solution, contained (1R, 2R, 4R)-2-chloro-8- p -menthen-1-ol at detection threshold. The presence of (1R, 2R, 4R)-2-chloro-8- p -menthen-1-ol in citrus essential oils results from processing conditions and can be reduced through the reduction of chlorine levels in treatment water. 相似文献
3.
4.
ABSTRACT The mixture of citrus fruits (orange, grapefruit, mandarin, and lemon) wastes was utilized to obtain high surface area activated carbon (AC) by H3PO4 activation. The production conditions were optimized and the optimum conditions were determined. The optimal-activated carbon (CFWAC) was characterized by various physicochemical techniques. CFWAC was also used as a sorbent for Pb (II) ions from water. Batch experiments were performed to explore the adsorption capacity and mechanism. The Langmuir isotherm and pseudo-second-order kinetic model showed good fitness to the experimental data. The maximum Pb (II) adsorption capacity of CFWAC was found to be 163.93 mg/g. 相似文献
5.
柑桔木虱有效防治药剂田间筛选试验 总被引:4,自引:1,他引:4
控制柑桔木虱是黄龙病综合防治最重要的措施。田间药效试验结果表明,敌敌畏、乐果、辛硫磷、马拉硫磷、乙酰甲胺磷、阿维菌素、丁醚脲等对木虱成虫的防效低于80%,吡虫啉为86.6%;甲氰菊酯及与三唑磷、丙溴磷、水胺硫磷的混剂,高效氯氰菊酯及与毒死蜱的混剂的防效都在90.0%以上;啶虫脒对成、若虫的防效都较差,与柴油、吡虫啉混用有增效作用。 相似文献
6.
Jay R Hoffman Jie Kang Nicholas A Ratamess Peter F Jennings Gerald Mangine Avery D Faigenbaum 《Journal of the International Society of Sports Nutrition》2006,3(1):35-7
Background
The purpose of this study was to examine the effect of nutritionally enriched JavaFit™ (JF) coffee (450 mg of caffeine, 1200 mg of garcinia cambogia, 360 mg of citrus aurantium extract, and 225 mcg of chromium polynicotinate) on resting oxygen uptake (VO2), respiratory exchange ratio (RER), heart rate (HR), and blood pressure (BP) in healthy and physically active individuals. 相似文献7.
近年来,我国柑橘生产发展迅猛,产量连年增长,但品质不佳。为此,探讨了土壤条件和施肥对柑橘品质的影响,以期为优质柑橘的生产提供依据。 相似文献
8.
9.
10.