全文获取类型
收费全文 | 128101篇 |
免费 | 20535篇 |
国内免费 | 31052篇 |
专业分类
林业 | 14816篇 |
农学 | 17437篇 |
基础科学 | 12905篇 |
40045篇 | |
综合类 | 47548篇 |
农作物 | 9253篇 |
水产渔业 | 7832篇 |
畜牧兽医 | 16044篇 |
园艺 | 4179篇 |
植物保护 | 9629篇 |
出版年
2024年 | 1090篇 |
2023年 | 1679篇 |
2022年 | 3109篇 |
2021年 | 3729篇 |
2020年 | 4997篇 |
2019年 | 8037篇 |
2018年 | 7185篇 |
2017年 | 8570篇 |
2016年 | 8960篇 |
2015年 | 9459篇 |
2014年 | 8685篇 |
2013年 | 9770篇 |
2012年 | 10187篇 |
2011年 | 9552篇 |
2010年 | 8368篇 |
2009年 | 7501篇 |
2008年 | 6402篇 |
2007年 | 6953篇 |
2006年 | 6386篇 |
2005年 | 5795篇 |
2004年 | 3920篇 |
2003年 | 3452篇 |
2002年 | 2965篇 |
2001年 | 2699篇 |
2000年 | 2820篇 |
1999年 | 2969篇 |
1998年 | 2767篇 |
1997年 | 2479篇 |
1996年 | 2274篇 |
1995年 | 2240篇 |
1994年 | 2107篇 |
1993年 | 1808篇 |
1992年 | 1653篇 |
1991年 | 1370篇 |
1990年 | 1128篇 |
1989年 | 980篇 |
1988年 | 830篇 |
1987年 | 622篇 |
1986年 | 500篇 |
1985年 | 265篇 |
1984年 | 231篇 |
1983年 | 234篇 |
1982年 | 214篇 |
1981年 | 265篇 |
1980年 | 207篇 |
1979年 | 163篇 |
1978年 | 134篇 |
1975年 | 115篇 |
1965年 | 141篇 |
1964年 | 147篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
981.
982.
Monitoring the dynamics of soil salinization is of great importance for agricultural production. This study selected Yucheng County, a typical county on the Huang-Huai-Hai Plain (HHHP) of China, as the study area and evaluated the spatial and temporal variation of soil salinization. Three methods, consisting of principal component analysis (PCA) transformation, tasseled cap (TC) transformation, and optimal band combination (OBC), were used to extract information from an early Landsat multispectral scanner (MSS) image from 1984, and their advantages were compared. In addition, OBC was used on a thematic mapper (TM) image from 2009. An iteratively self-organizing data analysis algorithm was used together with prior knowledge of likely classifications to interpret the MSS and TM images for data classification. Finally, a transfer matrix method was used to assess the spatial and temporal variability of soil salinization and analyze the driving factors of soil salinization. Compared to PCA transformation and OBC, TC transformation was a more effective method for extracting soil salinization information from the MSS sensor. The results indicate that a soil area of approximately 298 km2 was affected by salinity in 1984 in Yucheng County, of which 5.40%, 11.96%, and 12.75% were classified as being subject to slight, moderate, and severe salinization, respectively. In 2009, the saline area was reduced to only 146 km2, of which 10.70% and 3.75% were characterized by slight to moderate salinization and no severe salinization, respectively. The saline land decreased at an average rate of 6 km2 per year. This decrease was probably a result of lower groundwater depth, increased organic fertilizer or crop straw in soil, changed land use type, and increased vegetation coverage. 相似文献
983.
基于状态变换法的车辆悬架系统时滞反馈控制 总被引:2,自引:0,他引:2
为了提高车辆行驶平顺性和稳定性,研究悬架系统中时滞补偿控制效果,本文以赛欧轿车悬架系统为基础,建立2自由度车辆半主动悬架系统模型,设计了时滞反馈控制器,采用理论与试验相结合的方法对系统时滞反馈控制特性进行研究。首先建立含时滞的悬架系统动力学方程,采用常微分理论和多项式判别方法分析系统稳定性,并通过时域与频域仿真对结果进行验证。研究表明:采用传统二次型最优控制律对含时滞的悬架系统进行控制,当系统控制时滞较大时,系统定性特性可能会发生改变,甚至会失稳发散。为保证系统的稳定性,采用状态变换方法设计时滞反馈最优控制律,仿真表明采用该控制律不仅可以保证系统稳定性,系统的减振特性亦有改善。最后搭建了悬架时滞反馈控制平台,基于时域辨识方法测得系统固有时滞为0.065 s,通过对相同工况下仿真结果与试验结果进行对比,发现两者具有较好的一致性,误差在15%以内,满足业内使用要求,表明研究可信,结果可为主动/半主动车辆悬架控制器实际设计应用提供参考。 相似文献
984.
Qi Wang Quanwei Zhang Ze Gan Haijiang Li Yang Yang Yong Zhang Xingxu Zhao 《Reproduction in domestic animals》2020,55(2):189-199
Bactrian camel is an ancient and precious species of livestock; that is, unique resources exist in the desert and have important economic and scientific value. In recent years, the number of Bactrian camels has declined sharply. Due to its long reproductive cycle and seasonal oestrus, the mechanism of oestrus is unknown. To identify candidate biomarkers of reproduction, we performed a comprehensive proteomic analysis of serum from Bactrian camel in oestrus and non-oestrus, using isobaric tags for relative and absolute quantitation (iTRAQ) coupled with tandem mass spectrometry. We identified 359 proteins, of which 32 were differentially expressed: 11 were up-regulated and 21 were down-regulated in samples from camels in oestrus. We validated the differential expression of a subset of these proteins using qPCR and Western blot. Gene ontology annotation identified that the differentially expressed proteins function in cellular processes, metabolic processes and immune system processes. Notably, five of the differentially expressed proteins, PCGF5, histone H1.2, RBP4, FOLR1 and ANTXR2, are involved in reproductive regulatory processes in other animals. KEGG enrichment analysis demonstrated significant enrichment in several cardiac-related pathways, such as ‘dilated cardiomyopathy’, ‘hypertrophic cardiomyopathy’, ‘cardiac muscle contraction’ and ‘adrenergic signalling in cardiomyopathy’. Our results suggest that candidate biomarker (PCGF5, histone H1.2, RBP4, FOLR1 and ANTXR2) discovery can aid in understanding reproduction in Bactrian camels. We conclude that the profiling of serum proteomes, followed by the measurement of selected proteins using more targeted methods, offers a promising approach for studying mechanisms of oestrus. 相似文献
985.
Shoujiao Li Ana Barreiro Erik Steen Jensen Yingjun Zhang 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2020,70(2):165-175
ABSTRACTThe global interest in growing perennial grain crops such as intermediate wheatgrass (Thinopyrum intermedium) (Kernza) for production of food and feed is increasing. Intercropping Kernza with legumes may be a sustainable way of supplying nitrogen to soil and associated intercrop. We determined the competitive interactions between intercropped Kernza (K) and alfalfa (Medicago sativa L.) (A) under three inorganic nitrogen (N) rates N0, N1, N2 (0, 200, 400 kg ha?1) and five species relative frequencies (SRF) (100%K:0%A, 75%K:25%A, 50%K:50%A, 25%K:75%A and 0% K:100%A) in mixed intercrops (MI) in a greenhouse pot experiment. After 11 weeks of growth. Kernza dry matter yield (DM) and N accumulated (NACC) were low, but alfalfa DM and NACC high at 0 kg N ha?1. 200 and 400 kg N ha?1 fertiliser application increased the competitive ability (CA) of Kernza and reduced the CA of alfalfa. SRF had large impacts on alfalfa DM, NACC and NFIX only at 0 kg N ha?1 fertiliser, and insignificant impacts on Kernza at all N fertiliser levels, indicating that adjustment of SRF may not be an effective way to modulate the interspecific competition of Kernza. Further research on the other factors that influence the interspecific competition are warranted. 相似文献
986.
987.
988.
Ruonan Li Yu Yang Pan Hong Ziqi Zhang Lingqian Li Junnan Hui Xin Zheng 《Journal of animal physiology and animal nutrition》2020,104(1):280-290
Weaning may cause oxidative injury, immune response impairment, apoptosis and other injuries in piglets. Oxidative and endoplasmic reticulum stress (ERS) can elicit inflammatory responses, and persistent oxidative and ERS also may lead to apoptotic cascades, which is associated with the pathogenesis of multiple diseases. β-carotene, a natural carotenoid, has potential anti-inflammatory and antioxidant functions. However, the effect of β-carotene on apoptosis in weaned piglets and the detailed molecular mechanism remain unclear. In this study, we found that β-carotene decreased malondialdehyde (MDA) levels and increased the activities of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) in piglet serum. β-carotene could inhibit the mRNA levels of caspase-3 significantly, but had no significant inhibitory effect of the mRNA levels of caspase-9 and caspase-12 in the piglet jejunum. In addition, β-carotene decreased the activation of GRP78, CHOP, and JNK/p38 MAPK and the ratio of Bax/Bcl-2. Furthermore, β-carotene had a significant influence on the activation of ERS and apoptosis-related signals in TG-induced IPEC-J2. In the present study, β-carotene pre-treatment attenuated the ratio of Bax/Bcl-2 and prevented TG-induced increases in the level of PERK-CHOP and IRE1-JNK/p38 MAPK pathway activation in a dose-dependent manner. Overall, these findings indicate that β-carotene may protect weaning-induced apoptosis through inhibiting ERS. 相似文献
989.
990.