全文获取类型
收费全文 | 976篇 |
免费 | 16篇 |
国内免费 | 15篇 |
专业分类
系统科学 | 21篇 |
丛书文集 | 9篇 |
理论与方法论 | 15篇 |
现状及发展 | 258篇 |
研究方法 | 86篇 |
综合类 | 579篇 |
自然研究 | 39篇 |
出版年
2021年 | 4篇 |
2020年 | 11篇 |
2019年 | 8篇 |
2018年 | 21篇 |
2017年 | 18篇 |
2016年 | 24篇 |
2015年 | 26篇 |
2014年 | 23篇 |
2013年 | 49篇 |
2012年 | 120篇 |
2011年 | 74篇 |
2010年 | 21篇 |
2009年 | 40篇 |
2008年 | 48篇 |
2007年 | 29篇 |
2006年 | 43篇 |
2005年 | 34篇 |
2004年 | 50篇 |
2003年 | 34篇 |
2002年 | 40篇 |
2001年 | 47篇 |
2000年 | 20篇 |
1999年 | 12篇 |
1998年 | 24篇 |
1997年 | 22篇 |
1996年 | 3篇 |
1995年 | 7篇 |
1993年 | 7篇 |
1992年 | 4篇 |
1991年 | 6篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1985年 | 3篇 |
1984年 | 5篇 |
1982年 | 7篇 |
1981年 | 7篇 |
1980年 | 6篇 |
1979年 | 11篇 |
1978年 | 11篇 |
1977年 | 10篇 |
1976年 | 5篇 |
1974年 | 8篇 |
1973年 | 6篇 |
1972年 | 4篇 |
1971年 | 3篇 |
1970年 | 4篇 |
1969年 | 5篇 |
1968年 | 7篇 |
1967年 | 4篇 |
1966年 | 6篇 |
排序方式: 共有1007条查询结果,搜索用时 15 毫秒
181.
Yuri Fanchini Messas Herbert Silva Souza Marcelo O. Gonzaga Joao Vasconcellos-Neto 《Journal of Natural History》2017,51(45-46):2661-2679
Population dynamics of spiders may vary according to biotic and abiotic factors. We studied the phenology of the bark-dwelling spider Eustala perfida over a two-year period and investigated how temperature, precipitation, and prey availability were associated with the population of this species. The population of E. perfida presented a well-defined fluctuation, with one reproductive cycle per year. The recruitment of spiders occurred in summer, followed by successive phenological peaks at all stages of development. The species is protogynic, and the population of adult males peaks in the cold/dry season, indicating a winter mature phenological pattern. The diet of E. perfida is composed mainly of medium-sized homopterans, complemented by small dipterans and hymenopterans. We found that the higher abundance of spiders occurred two months after the highest values of precipitation and temperature, and three months after the higher abundance of potential prey items. These results indicate that spiders require time to respond to changes in environmental conditions. The species’ natural history and the structure of the trunks in which it lives may also affect the number of individuals in a particular area and over time. 相似文献
182.
本文把约束优化问题转化为互余问题,然后用分段光滑同伦间接地解决了约束优化问题minf(x),x≥0和互余问题,并给出了数值例子。 相似文献
183.
在<高等数学>教学中,如何使学生迅速、准确、深刻、灵活地理解和应用所学知识的内涵及思想方法?如何利用课堂有限的时间去启发和激励学生学会创新性探求思维?教学阐释的完满实现,为高校素质教育在课堂的实施开辟了一条新的途径. 相似文献
184.
185.
Jose Córdoba-Chacón Manuel D. Gahete Mario Duran-Prado Ana I. Pozo-Salas María M. Malagón F. Gracia-Navarro Rhonda D. Kineman Raul M. Luque Justo P. Castaño 《Cellular and molecular life sciences : CMLS》2010,67(7):1147-1163
Somatostatin and cortistatin exert multiple biological actions through five receptors (sst1-5); however, not all their effects
can be explained by activation of sst1-5. Indeed, we recently identified novel truncated but functional human sst5-variants,
present in normal and tumoral tissues. In this study, we identified and characterized three novel truncated sst5 variants
in mice and one in rats displaying different numbers of transmembrane-domains [TMD; sst5TMD4, sst5TMD2, sst5TMD1 (mouse-variants)
and sst5TMD1 (rat-variant)]. These sst5 variants: (1) are functional to mediate ligand-selective-induced variations in [Ca2+]i and cAMP despite being truncated; (2) display preferential intracellular distribution; (3) mostly share full-length sst5
tissue distribution, but exhibit unique differences; (4) are differentially regulated by changes in hormonal/metabolic environment
in a tissue- (e.g., central vs. systemic) and ligand-dependent manner. Altogether, our results demonstrate the existence of
new truncated sst5-variants with unique ligand-selective signaling properties, which could contribute to further understanding
the complex, distinct pathophysiological roles of somatostatin and cortistatin. 相似文献
186.
Marcos Leandro Hoffmann Souza Luis Henrique Rodrigues Maria Isabel Wolf Motta Morandi 《Systemic Practice and Action Research》2018,31(1):87-104
The growth of the petrochemical industry is based on end-user applications such as the automotive and construction sectors, which are the main drivers of the styrene market. However, the use of substitutes for petrochemicals is a reality and creates a competition in the applications of petroleum products. In this sense, this research aimed to design a system dynamics model to evaluate different scenarios, observing the behavior of the styrene demand over time. In the first phase of the project, a greater understanding of the issue was created and a closed loops diagram was elaborated. It was used during the second phase to design an explanatory regression validation model for the styrene demand. In phase three, a visualizing model and scenarios were designed. The scenarios themselves and the results of each scenario were evaluated. The designed and simulated scenarios aimed to evaluate the impact that the use of substitute materials and the variations in gross domestic product cause to the styrene market. The use of system dynamics together with scenario planning was efficient as different strategies for the market could be evaluated based on the simulated scenarios. A critical analysis of the model’s contribution to the decision-making within organizations concludes the study. 相似文献
187.
电力输电线路高塔驱鸟系统设计 总被引:1,自引:0,他引:1
针对鸟害容易引起电力输电线路事故的问题,设计了一个红外驱鸟报警系统。系统采用被动式热释电红外传感器作为检测部件,进行非接触式远距离检测,并将检测到的微弱电信号转换输出,经被动式热释电红外传感信号处理器BISS0001,进行运算放大、滤波、功率放大,利用所得信号触发报警电路,使鸟受到惊吓飞离杆塔,从而保护输电线路免受鸟害威胁。分析表明,系统具有良好且环保的驱鸟效果。 相似文献
188.
Andréa Andrade Vilela 《Journal of Natural History》2018,52(7-8):415-428
Ants commonly participate simultaneously in mutualisms with honeydew-producing hemipterans and extrafloral nectar-bearing host plants. These interactions are based on the exchange of resources (honeydew and extrafloral nectar) for ant protection against natural enemies. The benefits may vary according to the species of ant interacting, and the outcomes for the host plant and hemipteran will depend on the results of the ant-plant-hemipteran relationship as a whole. We studied a plant-mealybug association with Camponotus crassus Mayr (Formicinae) and Ectatomma tuberculatum Olivier (Ectatomminae) in a Brazilian tropical savanna. We aimed to elucidate whether the frequency of visitation by different species of ants can be affected by neighbouring colonies of mealybugs, and whether these ant species influence the number of hemipterans in a different way. Furthermore, we intended to find out whether the interaction between ant and hemipteran has any effect on the proportion of fruit production or on the abundance of trophobiont and non-trophobiont herbivores, also influenced by the ant species. Our results show that neighbouring aggregations of mealybugs influenced the frequency of ant visitation and the ants affected the number of nymphs over time, with both positive results only for C. crassus. We also detected an indirect negative effect on proportion of fruit production and an increase in abundance of trophobiont and non-trophobiont herbivores in the presence of C. crassus-mealybug interaction. Thus, we provide further evidence that colonies of hemipterans interacting with ants can be beneficial for these herbivorous insects, but they are quite harmful to the host plant. Nevertheless, the outcomes can be highly conditional in relation to ant species. 相似文献
189.
This paper considers the distributed estimation of a source parameter using quantized sensor observations in a wireless sensor network with noisy channels. Repetition codes are used to transmit quantization bits of sensor observations and a quasi best linear unbiased estimate is constructed to estimate the source parameter. Simulations show that the estimation scheme achieves a better power and spectral efficiency than the previous scheme. 相似文献
190.
本文主要论述了高校图书馆自动化系统与数据库建设的内容及系统功能特征,提出了应当注意的问题. 相似文献