全文获取类型
收费全文 | 5977篇 |
免费 | 338篇 |
国内免费 | 902篇 |
专业分类
林业 | 510篇 |
农学 | 512篇 |
基础科学 | 868篇 |
1822篇 | |
综合类 | 2157篇 |
农作物 | 200篇 |
水产渔业 | 245篇 |
畜牧兽医 | 357篇 |
园艺 | 94篇 |
植物保护 | 452篇 |
出版年
2024年 | 32篇 |
2023年 | 130篇 |
2022年 | 270篇 |
2021年 | 272篇 |
2020年 | 273篇 |
2019年 | 338篇 |
2018年 | 217篇 |
2017年 | 381篇 |
2016年 | 462篇 |
2015年 | 365篇 |
2014年 | 304篇 |
2013年 | 447篇 |
2012年 | 551篇 |
2011年 | 481篇 |
2010年 | 352篇 |
2009年 | 355篇 |
2008年 | 258篇 |
2007年 | 293篇 |
2006年 | 228篇 |
2005年 | 196篇 |
2004年 | 163篇 |
2003年 | 106篇 |
2002年 | 111篇 |
2001年 | 88篇 |
2000年 | 81篇 |
1999年 | 71篇 |
1998年 | 48篇 |
1997年 | 44篇 |
1996年 | 57篇 |
1995年 | 48篇 |
1994年 | 36篇 |
1993年 | 32篇 |
1992年 | 25篇 |
1991年 | 25篇 |
1990年 | 20篇 |
1989年 | 20篇 |
1988年 | 13篇 |
1987年 | 11篇 |
1986年 | 3篇 |
1985年 | 5篇 |
1984年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有7217条查询结果,搜索用时 13 毫秒
21.
甘肃河东春季透雨日期与海温的相关分析 总被引:9,自引:1,他引:9
利用甘肃河东和宁夏回族自治区中南部1971~2000年67个站的春季第一场透雨日期资料,用EOF和REOF方法对其做了分解,进行了透雨日期的气候分区,分析了春季第一场透雨日期的时空分布特征,并计算了其与北太平洋海温的相关关系。结果表明,北部透雨平均日期与南部透雨平均日期具有相反的趋势,北部最迟在5月下旬,南部最早在4月中旬;20世纪70年代透雨日期偏迟,80年代透雨日期偏早,90年代偏迟。透雨早的年份,春季降水偏多,透雨迟的年份,春季降水偏少;透雨日期与北太平洋海温呈显著的负相关,当北太平洋地区的海温偏高时,甘肃河东春季透雨日期偏早。当北太平洋地区的海温偏低时,甘肃河东春季透雨日期偏迟。 相似文献
22.
R. Koenig E. Pfeilstetter H. Kegler D.E. Lesemann 《European journal of plant pathology / European Foundation for Plant Pathology》2004,110(4):429-433
Two virus isolates from water samples — one from a small stream in South Western Germany and another one from the Havel river in North Eastern Germany c. 500 km away, proved to be strains, named S and H, respectively, of a new Tombusvirus for which the name Havel river virus (HaRV) had been suggested previously in a brief account. Immunoelectron microscopical decoration tests and sequence comparisons of the coat proteins indicated that the two HaRV strains are only distantly related to known Tombusviruses. The closest relationships were found to Cucumber necrosis virus. Nothing is known about their natural hosts. Because the S strain of HaRV was isolated in a woody area from a small stream close to its origin, they may be pathogens of trees or wild plants in such habitats. 相似文献
23.
在地铁深基坑施工中,围护结构对基坑的安全起着至关重要的作用。本文依据合肥地铁一号线明光路站,施工过程中,由于车站3号出入口为出土口,原计划的第一道钢筋混凝土支撑无法实现,更改为钢支撑,通过有限元分析软件MIDAS-GTS\NX,建立二维模型进行数值模拟,对围护结构的变形和地表沉降进行分析,结果表明:第一道支撑采用钢支撑代替钢筋混凝土支撑对围护结构的侧移值影响不大,钢筋混凝土支撑控制地表沉降的效果要比钢支撑好,对今后类似工程变更提供依据。 相似文献
24.
Morphological and Physiological Responses of Plantain (Plantago lanceolata) and Chicory (Cichorium intybus) to Water Stress and Defoliation Frequency 下载免费PDF全文
L. M. Cranston P. R. Kenyon S. T. Morris N. Lopez‐Villalobos P. D. Kemp 《Journal of Agronomy and Crop Science》2016,202(1):13-24
Plants are often subjected to periods of water stress. There are little data examining the effect of water stress on the forage species Plantago lanceolata and Cichorium intybus. In two pot experiments with P. lanceolata and C. intybus, morphological responses under optimum, dry, and very‐dry water treatments with weekly, fortnightly and 3‐weekly defoliation intervals and physiological responses under optimum and very‐dry water treatments were measured. A third experiment compared the rooting depths of P. lanceolata and C. intybus under field conditions. These findings suggest that both P. lanceolata and C. intybus can survive and continue to grow under water stress conditions with the main differences between the two species being attributable to morphological characteristics (root mass, taproot diameter and shoot mass fraction) rather than differences at a physiological level. Overall, the results suggest plantain may be more productive under moderate drought due to its greater shoot mass fraction, whereas chicory may be more productive and persistent under severe drought due to its greater root mass, taproot diameter and root depth under field conditions. 相似文献
25.
26.
响应曲面法优化高粱挤压最佳操作参数的研究 总被引:1,自引:0,他引:1
以高粱为原料,研究系统操作参数,包括:物料含水率、喂料速度、螺杆转速、机筒温度对目标参数的影响,并以响应曲面法优化最佳操作参数,优化得到的最佳操作参数为:物料含水率15.77%,喂料速度26.97r/min,螺杆转速181.20r/min,五区温度158.28℃。 相似文献
27.
28.
The aim of this study was to develop a novel oil-in-water (O/W) emulsion as adjuvant diluents (AD) for live vaccine against classical swine fever (CSF) that could effectively enhance the immune effect of vaccine.The AD was prepared by high-pressure homogenization technique.Formulations and preparation parameters were optimized with response surface design.Its stability, particle size, polydispersity (PDI) and Zeta potential were characterized.The humoral immune response and cellular immune response of the AD were evaluated with BALB/c mice by intramuscular injection.The particle size of the AD prepared by optimized formulation and parameters was 100.4 nm, PDI was 0.147, and Zeta potential was —28.7 mV.The experiment results showed that the AD had good stability.The AD was inoculated combined with live vaccine against CSF into BALB/c mice by intramuscular injection.The results showed that the live vaccine against CSF specific immune responses could be evoked in mice by co-inoculation with AD and vaccine.The cellular immune response levels in co-inoculated groups were significantly higher than control group (P<0.05), with obvious phenomena of higher levels of IFN-γ, IL-6 and IL-4 in serum.The result revealed that cellular immune capability significantly improved with the AD.The results strongly revealed that cellular immune capability significantly improved by introducing AD for effective immune-adjuvant for live vaccine against CSF. 相似文献
29.
《灌溉排水学报》2019,(7)
【目的】参考作物蒸散量(ET_0)的估算是计算作物腾发量的基础,也是区域水资源评价与灌溉政策制定的前提,因此,研究ET_0变化趋势与估算模型能够对该地区农田灌溉用水预报提供基础支持,进而为灌溉制度的制定以及水资源高效利用提供科学依据。【方法】以河南新乡气象站1962―2016年气象资料为基础,运用Penman-Monteith模型计算ET_0序列,Mann-Kendall趋势检验法对年及季节尺度ET_0序列变化趋势进行分析,并用均值生成函数模型对其进行了拟合与验证。【结果】①新乡地区年尺度ET_0序列在1975―2016年间呈减小趋势,并在1985―2004年、2006年显著;②新乡地区春季ET_0序列在1982―1983年及1988―2003年间呈显著的减小趋势,夏季ET_0序列在1980―2012年间呈显著的减小趋势。③均值生成函数模型在对年尺度ET_0序列进行拟合时,其一致性系数达到0.83,绝对误差与相对误差分别在-120.8~120.0 mm及-14.0%~18.2%之间。④均值生成函数模型在对季节尺度ET_0序列进行拟合时,其一致性系数在春、夏、秋、冬各季节分别达到0.85、0.81、0.88及0.89,绝对误差分别在-60.2~64.3、-64.4~58.9、-39.6~32.8、-37.0~25.1 mm之间,相对误差分别在-20.1%~36.7%、-22.1%~32.1%、-18.0%~22.9%、-23.9%~24.6%之间。【结论】新乡地区年尺度ET_0序列在1985―2004年间显著减小,均值生成函数模型在对年及各季节尺度ET_0序列进行拟合时整体效果较好,因此,可通过其进行年及季节尺度ET_0序列的估算,且其在秋、冬二季的拟合效果明显好于春、夏二季。 相似文献
30.
During early lactation, dairy cows may present a transient immunosuppressive state and develop anaplasmosis caused by Anaplasma marginale. In this study, clinical anaplasmosis in dairy cattle in the Thrace region of Turkey was investigated with respect to within-herd prevalence, vertical transmission, and genetic diversity. In March and September 2015, thirty lactating cows showed primary clinical signs of anaplasmosis, including fever, anaemia, decreased milk yield, anorexia, and laboured breathing. Symptoms disappeared in most cows after administration of long-acting oxytetracycline, but nine of them (30%) died. Following diagnosis based on clinical signs, microscopy and molecular findings, blood samples were collected from apparently healthy lactating cows (n = 184), pregnant heifers (n = 39) and newborn calves (n = 24). DNA was extracted from each sample and analyzed for the presence of major surface proteins (MSPs) of A. marginale, followed by sequencing to assess diversity of isolates. Microscopic examination of erythrocytes revealed A. marginale inclusion bodies in symptomatic cows. Examination of thin blood smears showed 3.8% of the lactating, clinically asymptomatic, cows to be infected with A. marginale, while nPCR detected 31.0% positive. A. marginale infection was not detected in pregnant heifers by either method. Congenital infection was found in one calf by nPCR. This is the first report of transplacental transmission of A. marginale in Turkey. The MSP4 sequence analyses showed high genetic diversity among the isolates, presenting 97.6-99.6% homology at the amino acid level. The sequences of MSP1a amplicons revealed genetic diversity providing three new tandem repeats. 相似文献