全文获取类型
| 收费全文 | 16538篇 |
| 免费 | 13篇 |
专业分类
| 林业 | 3630篇 |
| 农学 | 1300篇 |
| 基础科学 | 137篇 |
| 2754篇 | |
| 综合类 | 715篇 |
| 农作物 | 2121篇 |
| 水产渔业 | 1796篇 |
| 畜牧兽医 | 1102篇 |
| 园艺 | 1116篇 |
| 植物保护 | 1880篇 |
出版年
| 2022年 | 5篇 |
| 2021年 | 15篇 |
| 2020年 | 7篇 |
| 2019年 | 7篇 |
| 2018年 | 2754篇 |
| 2017年 | 2707篇 |
| 2016年 | 1189篇 |
| 2015年 | 69篇 |
| 2014年 | 23篇 |
| 2013年 | 17篇 |
| 2012年 | 810篇 |
| 2011年 | 2136篇 |
| 2010年 | 2106篇 |
| 2009年 | 1253篇 |
| 2008年 | 1326篇 |
| 2007年 | 1574篇 |
| 2006年 | 29篇 |
| 2005年 | 97篇 |
| 2004年 | 102篇 |
| 2003年 | 150篇 |
| 2002年 | 61篇 |
| 2001年 | 5篇 |
| 2000年 | 41篇 |
| 1998年 | 2篇 |
| 1995年 | 2篇 |
| 1994年 | 1篇 |
| 1993年 | 15篇 |
| 1992年 | 7篇 |
| 1990年 | 1篇 |
| 1989年 | 7篇 |
| 1988年 | 12篇 |
| 1987年 | 1篇 |
| 1986年 | 1篇 |
| 1983年 | 3篇 |
| 1981年 | 1篇 |
| 1977年 | 5篇 |
| 1972年 | 1篇 |
| 1970年 | 1篇 |
| 1969年 | 1篇 |
| 1968年 | 5篇 |
| 1967年 | 2篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
41.
42.
Umma Tamima 《林业研究》2016,27(4):853-861
The objective was to evaluate the performance of the co-management of Nishorgo Support Project at Chunati Wildlife Sanctuary in Bangladesh. I adopted the Focus Groups Discussion method for opinion survey and applied the SWOTAHP technique for data analysis. Local people did not participate in the decision-making process of forest management and they perceived co-management as a threat to their livelihoods. Moreover, mistrust and misunderstanding among different stakeholders, political and ethical conflicts, lack of property rights of tribal communities, and lack of accountability and transparency were identified as the drawbacks of co-management. 相似文献
43.
44.
45.
46.
47.
A new functional porous carbons (PC-WF) is prepared by activation-pyrolysis method use waste cotton fabrics (WF) as an abundant, cheap and available precursor for removal of Brilliant Crocein (BC-GR) and Cationic Red 2GL (CR-GL) from aqueous phase. The PC-WF was characterized by BET, FTIR, SEM, and XRD techniques, the surface area, total pore volume, average pore diameter was found as 1463.5 m2 g-1, 0.783 cm3 g-1 and 2.14 nm, respectively. The influences on BC-GR and CR-GL adsorption of various experimental factors such as initial concentration and temperature were investigated. Adsorption kinetics was found to be best represented by the pseudo-second order model. The adsorption capacity was 319.8 mg g-1 for BC-GR and 842.5 mg g-1 for CR-GL at 30 °C, respectively. The results indicate that for waste cotton fabrics in particular, the practical application of this process to the production of porous carbon would be possible. 相似文献
48.
49.
50.