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81.
82.
斑须蝽三代卵块的空间分布和田间抽样技术研究 总被引:3,自引:0,他引:3
通过田间调查和计算,明确了斑须蝽三代卵块呈聚集分布,且以负二项分布为主。理论抽样数当t=1.00,D=0.3时,n=13.091/+63.878,如果防治指标定为百株虫卵块12块时,则最大抽样数为173株,序贯抽样的累积虫卵块数量界限为:T0(N)=0.12N±0.4735。田间随机取样以平行线和Z字形为最佳。 相似文献
83.
通过空间分布型指数分析,甘薯象对薯块、著株危害空间分布型为随机分布或均匀分布;同时确定了理论抽样数 相似文献
84.
农田林网化地区近地面层廓线特征研究 总被引:2,自引:0,他引:2
大面积林网化地区近地面层大气的系留气球观测发现,近地面层大气的风、温、湿分为两层,即下边界层和扰动边界层,其厚度和廓线分布与理查逊数有关,在中性天气条件下均满足对数分布规律,边界层(特别是扰动边界层)内的摩擦速度U."与旷野对比点的摩擦速度U0增大1个数量级,而粗糙度Z"0增大2个数量级,甚至更大。 相似文献
85.
The influence of sampling method on the classification of wetland macroinvertebrate communities 总被引:1,自引:1,他引:0
Macroinvertebrate communities sampled by a corer, plankton net and sweep net from five wetlands on the Swan Coastal Plain
were compared. The composition of the fauna collected in sweeps and tows was generally similar and differed from that collected
in the cores. Cores caught fewer species than tows and sweeps at all wetlands and did not capture fast swimming hemipterans
or less abundant taxa. The highest species richness was recorded in sweep samples in four out of the five wetlands. Classification
(TWIN-SPAN) and ordination (SSH) of the samples collected in sweeps and tows gave good separation of the wetlands, whereas
classification of core samples did not. Coring appeared to be the least suitable sampling method for describing the major
components of the macroinvertebrate communities of these wetlands. Plankton tows were useful if the time available for sorting
was limited as these samples were free of sediments and generally gave similar results to those obtained with sweeps. Sweeps
appeared to be the most useful method for a large classification study as they collected more species and resulted in the
best discrimination amongst wetlands. 相似文献
86.
87.
88.
Comparison of conformational characteristics in structurally similar protein pairs. 总被引:17,自引:7,他引:10 下载免费PDF全文
T. P. Flores C. A. Orengo D. S. Moss J. M. Thornton 《Protein science : a publication of the Protein Society》1993,2(11):1811-1826
Although it is known that three-dimensional structure is well conserved during the evolutionary development of proteins, there have been few studies that consider other parameters apart from divergence of the main-chain coordinates. In this study, we align the structures of 90 pairs of homologous proteins having sequence identities ranging from 5 to 100%. Their structures are compared as a function of sequence identity, including not only consideration of C alpha coordinates but also accessibility, Ooi numbers, secondary structure, and side-chain angles. We discuss how these properties change as the sequences become less similar. This will be of practical use in homology modeling, especially for modeling very distantly related or analogous proteins. We also consider how the average size and number of insertions and deletions vary as sequences diverge. This study presents further quantitative evidence that structure is remarkably well conserved in detail, as well as at the topological level, even when the sequences do not show similarity that is significant statistically. 相似文献
89.
《Current biology : CB》2023,33(10):1906-1915.e6
90.
In observational cohort studies with complex sampling schemes, truncation arises when the time to event of interest is observed only when it falls below or exceeds another random time, that is, the truncation time. In more complex settings, observation may require a particular ordering of event times; we refer to this as sequential truncation. Estimators of the event time distribution have been developed for simple left-truncated or right-truncated data. However, these estimators may be inconsistent under sequential truncation. We propose nonparametric and semiparametric maximum likelihood estimators for the distribution of the event time of interest in the presence of sequential truncation, under two truncation models. We show the equivalence of an inverse probability weighted estimator and a product limit estimator under one of these models. We study the large sample properties of the proposed estimators and derive their asymptotic variance estimators. We evaluate the proposed methods through simulation studies and apply the methods to an Alzheimer's disease study. We have developed an R package, seqTrun , for implementation of our method. 相似文献