全文获取类型
收费全文 | 45篇 |
免费 | 2篇 |
专业分类
林业 | 7篇 |
农学 | 3篇 |
综合类 | 5篇 |
农作物 | 6篇 |
畜牧兽医 | 25篇 |
植物保护 | 1篇 |
出版年
2013年 | 1篇 |
2010年 | 4篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2007年 | 2篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2002年 | 1篇 |
1999年 | 1篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1985年 | 1篇 |
1972年 | 1篇 |
1971年 | 3篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1968年 | 2篇 |
1954年 | 2篇 |
1930年 | 2篇 |
1928年 | 4篇 |
1914年 | 3篇 |
1913年 | 1篇 |
1896年 | 2篇 |
排序方式: 共有47条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Kast 《Forstwissenschaftliches Centralblatt》1914,36(8-9):499
Ohne Zusammenfassung 相似文献
6.
7.
ABSTRACT Despite the fact that nonemployment income makes up approximately one-third of all personal income, its impact on local area economies has not been closely examined. This study uses Michigan county data to examine the impact of nonemployment income on nonbasic income over a twenty-seven-year period. This impact is compared to the impact of basic income by employing regression analysis to estimate comparative multiplier effects for both types of income. Nonemployment income is found to have a significant impact on nonbasic income, particularly in metropolitan and nonmetropolitan urban counties, where its impact appears to be stronger than that of basic income. 相似文献
8.
Kast 《Forstwissenschaftliches Centralblatt》1914,36(11):606
Ohne Zusammenfassung2. Verz. s. Forstw. Cntralbl. 1914, S. 499. 相似文献
9.
10.
TB Mitchell JJ Bollinger DHE Dubin X Huang WM Itano RH Baughman 《Science (New York, N.Y.)》1998,282(5392):1290-1293
Laser-cooled 9Be+ ions confined in two-dimensionally extended lattice planes were directly observed, and the images were used to characterize the structural phases of the ions. Five different stable crystalline phases were observed, and the energetically favored structure could be sensitively tuned by changing the areal density of the confined ions. The experimental results are in good agreement with theoretical predictions for the planar (infinite in two dimensions) one-component plasma. Qualitatively similar structural phase transitions occur, or are predicted to occur, in other experimentally realizable planar systems. 相似文献