全文获取类型
收费全文 | 1114篇 |
免费 | 110篇 |
国内免费 | 211篇 |
出版年
2024年 | 3篇 |
2023年 | 15篇 |
2022年 | 35篇 |
2021年 | 29篇 |
2020年 | 33篇 |
2019年 | 35篇 |
2018年 | 42篇 |
2017年 | 59篇 |
2016年 | 42篇 |
2015年 | 28篇 |
2014年 | 39篇 |
2013年 | 110篇 |
2012年 | 68篇 |
2011年 | 85篇 |
2010年 | 83篇 |
2009年 | 71篇 |
2008年 | 69篇 |
2007年 | 96篇 |
2006年 | 90篇 |
2005年 | 68篇 |
2004年 | 62篇 |
2003年 | 52篇 |
2002年 | 45篇 |
2001年 | 28篇 |
2000年 | 22篇 |
1999年 | 15篇 |
1998年 | 12篇 |
1997年 | 10篇 |
1996年 | 6篇 |
1995年 | 11篇 |
1994年 | 10篇 |
1993年 | 7篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1988年 | 6篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1983年 | 5篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1972年 | 3篇 |
1971年 | 4篇 |
1970年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有1435条查询结果,搜索用时 0 毫秒
221.
对危险信号的快速警觉具有生物学意义,研究发现视觉恐惧信号可以经过两条不同的通路传达杏仁核:一条直接的皮层下通路,另一条是间接的视觉皮层通路.最近三年(2004-2006)一批脑成像和电生理研究对此进行了深入探讨.本文以此为基础对两条通路的主要神经结构,神经传递的先后过程以及它们间的关系进行了详细的综述. 相似文献
222.
223.
农村留守儿童人格特征研究 总被引:6,自引:0,他引:6
留守儿童是我国社会转型期的产物,是新时期出现的特殊儿童群体.本文采用Y-G性格测验、学生团体主题统觉测验(G-TAT)和S-K克雷佩林心理测验方法,对江西玉山县242名农村留守儿童和一般儿童的人格发展进行调查,比较分析了留守儿童和一般儿童在人格特征方面存在差异,并从亲子关系角度尝试分析了导致这些人格特征差异的原因. 相似文献
224.
225.
226.
关于社会建设的内涵和外延——兼论当前中国社会建设的时代内容 总被引:13,自引:0,他引:13
在转变社会与自然、社会与个人付出双重代价的旧式现代性的发展方式,推进以人为本,把自然代价和社会代价减少到最低限度的新型现代性实践的过程中,社会建设发挥着不可替代的作用.社会建设的基本内涵可以理解为,在社会领域建立和完善对各种社会资源和社会机会进行合理配置的社会结构和社会机制,以及处理社会矛盾、社会问题和社会风险的创新机制.社会建设的外延从广义上说,是指包括政治、经济和思想文化各子系统在内的整个社会大系统的建设;从狭义上说,着重是指与政治、经济、思想文化各子系统并列的社会子系统的发展、建设和管理.社会建设对于弥补政府失灵和市场失灵、增进社会公平正义、奠定社会和谐的坚实基础,有着至关重要的意义. 相似文献
227.
Wang Z Pan Y Li W Jiang H Chatzimanolis L Chang J Gong Z Liu L 《Learning & memory (Cold Spring Harbor, N.Y.)》2008,15(3):133-142
The role of the foraging (for) gene, which encodes a cyclic guanosine-3',5'-monophosphate (cGMP)-dependent protein kinase (PKG), in food-search behavior in Drosophila has been intensively studied. However, its functions in other complex behaviors have not been well-characterized. Here, we show experimentally in Drosophila that the for gene is required in the operant visual learning paradigm. Visual pattern memory was normal in a natural variant rover (for(R)) but was impaired in another natural variant sitter (for(S)), which has a lower PKG level. Memory defects in for(S) flies could be rescued by either constitutive or adult-limited expression of for in the fan-shaped body. Interestingly, we showed that such rescue also occurred when for was expressed in the ellipsoid body. Additionally, expression of for in the fifth layer of the fan-shaped body restored sufficient memory for the pattern parameter "elevation" but not for "contour orientation," whereas expression of for in the ellipsoid body restored sufficient memory for both parameters. Our study defines a Drosophila model for further understanding the role of cGMP-PKG signaling in associative learning/memory and the neural circuit underlying this for-dependent visual pattern memory. 相似文献
228.
Human syntax acquisition involves a system that can learn constraints on possible word sequences in typologically-different human languages. Evaluation of computational syntax acquisition systems typically involves theory-specific or language-specific assumptions that make it difficult to compare results in multiple languages. To address this problem, a bag-of-words incremental generation (BIG) task with an automatic sentence prediction accuracy (SPA) evaluation measure was developed. The BIG–SPA task was used to test several learners that incorporated n-gram statistics which are commonly found in statistical approaches to syntax acquisition. In addition, a novel Adjacency–Prominence learner, that was based on psycholinguistic work in sentence production and syntax acquisition, was also tested and it was found that this learner yielded the best results in this task on these languages. In general, the BIG–SPA task is argued to be a useful platform for comparing explicit theories of syntax acquisition in multiple languages. 相似文献
229.
Quantum dynamics of human decision-making 总被引:2,自引:0,他引:2
Jerome R. Busemeyer Zheng Wang James T. Townsend 《Journal of mathematical psychology》2006,50(3):220-241
A quantum dynamic model of decision-making is presented, and it is compared with a previously established Markov model. Both the quantum and the Markov models are formulated as random walk decision processes, but the probabilistic principles differ between the two approaches. Quantum dynamics describe the evolution of complex valued probability amplitudes over time, whereas Markov models describe the evolution of real valued probabilities over time. Quantum dynamics generate interference effects, which are not possible with Markov models. An interference effect occurs when the probability of the union of two possible paths is smaller than each individual path alone. The choice probabilities and distribution of choice response time for the quantum model are derived, and the predictions are contrasted with the Markov model. 相似文献
230.
遗产的真实与完整是世界遗产公约的核心,五台山申报世界遗产应注重科学化管理与保护性开发,该文对此提出了若干建议。 相似文献