首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   81篇
  免费   59篇
  国内免费   10篇
  2022年   2篇
  2021年   3篇
  2020年   2篇
  2019年   2篇
  2018年   3篇
  2017年   3篇
  2016年   3篇
  2015年   3篇
  2014年   5篇
  2013年   30篇
  2012年   3篇
  2010年   1篇
  2009年   3篇
  2008年   6篇
  2007年   2篇
  2006年   3篇
  2005年   6篇
  2004年   4篇
  2003年   1篇
  2002年   3篇
  2001年   7篇
  2000年   2篇
  1999年   7篇
  1998年   1篇
  1996年   1篇
  1995年   1篇
  1994年   2篇
  1993年   4篇
  1992年   2篇
  1991年   3篇
  1990年   2篇
  1989年   2篇
  1988年   5篇
  1987年   4篇
  1986年   3篇
  1985年   3篇
  1984年   1篇
  1983年   4篇
  1982年   1篇
  1981年   2篇
  1979年   2篇
  1977年   1篇
  1976年   1篇
  1975年   1篇
排序方式: 共有150条查询结果,搜索用时 31 毫秒
91.
The present study examined whether maximizing tendency predicts Japanese adults' likelihood of getting married and their age at first marriage. Registered members of a survey company panel (n = 428) completed the Japanese version of the Relational Maximization Scale, which was used to assess maximizing tendency consisting of two factors. The first factor, “high standards,” was not related to either of the two variables under investigation. The second factor, “alternative search,” was positively related to age at first marriage but not to the likelihood of getting married. The results thus suggest that those who seek the best possible marriage partner tend to get married at a later age, but that they are as likely to get married as those who do not. The finding that maximizing tendency did not significantly predict the likelihood of marriage suggests that getting married remains a strong social norm in Japan.  相似文献   
92.
Maximizing tendency has been associated with greater accumulation of choice alternatives prior to selection of a preference. It is not known whether this search behavior extends to situations in which accumulation of new choice alternatives comes with the potential loss of existing ones. In Study 1, we replicate the original finding of greater accumulation of choice alternatives, using a computer‐based laboratory task. We then provide evidence, in Studies 2 and 3, that when potential loss of existing options is incorporated into the task, maximization is associated with less rather than more search for additional options. Maximization components of decision difficulty and alternative search, but not high standards or satisficing, explain this behavior. Other task measures are also collected, but few maximization‐related differences are observed. The findings support an interpretation of maximizers as decision makers who are as concerned with the potential loss of existing options as with the loss of undiscovered future ones. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   
93.
94.
The self-guided molecular dynamics (SGMD) method, which can enhance the conformational sampling efficiency in MD simulations, was applied in investigating the phase transformation of Cu precipitate in α-iron that took place during thermal aging. It was shown that the SGMD method can accelerate calculating the bcc to 9R structure transformation of a small precipitate (even 4.0 nm in size), enabling the transformation without introducing any excess vacancies. The size dependence of the transformation also agreed with that seen in previous experimental studies.  相似文献   
95.
The static dielectric constants of binary mixtures of N-methylformamide (NMF), used as a solute with the solvents water (W), ethyl alcohol (EA), ethylene glycol (EG), dimethyl sulphoxide (DMSO), acetone (Ac) and 1,4-dioxane (Dx), have been measured over the entire concentration range at 30°C. The negative values of excess dielectric constant and less-than-unity values of the corrective Kirkwood correlation factor of these binary mixtures are used to analyse the formation of H-bond complexes and molar ratio of the stable adduct. In these systems, the unassociated mixture constituents, DMSO, Ac and Dx, act as structure-breakers for self-associated linear structures of NMF, whereas, both the self-associated mixture constituents (W, EA and EG mixtures with NMF) act as structure-breakers to each other during the complexations. It is found that the large variations in the strength of H-bond complexation and the effective number of parallel aligned dipoles in the mixtures are governed by the dielectric constant of the solvents.  相似文献   
96.
We report a computational study of BaCO3 at high pressure using molecular dynamics simulation based on a recent potential model. The first phase transition from the witherite to the post-aragonite phase is observed at 9.67 GPa with a resistance to shear along the [0 0 1] direction and a high compressibility in a direction perpendicular to the layers. This stable phase is also found through the variation of the bulk modulus, the shear moduli, and the compressional and shear wave velocities with pressure. A softening mode is noticed at a pressure around 10 GPa. The computed X-ray diffraction pattern of the post-aragonite phase at 16 GPa shows favorable agreement with the available experimental data.  相似文献   
97.
Molecular dynamics simulations are used to show that cyclic mechanical loading can relax the non-equilibrium grain boundary (GB) structures of nanocrystalline metals by dissipating energy and reducing the average atomic energy of the system, leading to higher strengths. The GB processes that dominate deformation in these materials allow low-energy boundary configurations to be found through kinematically irreversible structural changes during cycling, which increases the subsequent resistance to plastic deformation.  相似文献   
98.
Photo-induced phenomena in glasses excited by two-photon absorption have been studied and compared with those produced by bandgap illumination. The two-photon excitation of As2S3 gives a refractive-index increase, unaccompanied by photodarkening. Raman-scattering spectra show that the excitation increases the density of ‘wrong’ bonds. These observations are discussed and compared with photo-induced changes in SiO2.  相似文献   
99.
查美尼克是分子生物学的奠基人之一,第一个开发了无细胞蛋白质合成体系,发现了蛋白质合成中氨基酸ATP活化机制,发现了tRNA及其在基因表达中的作用,特别是发明的反义技术创造了一个新的生物技术原理。通过查美尼克的成就我们可以对分子生物学历史面貌有一个了解从而对生命科学的发展有一个新的视点。  相似文献   
100.
Baum and staddon disagree on the status of internal states in behavior analysis. Baum advocates molar behaviorism, treating behavior in temporally extended segments and so avoiding the need for internal states. Staddon argues that internal states merely represent the effects of different histories and that their use brings behavior analysis in line with the established sciences. The dispute is one form of the age‐old molar—molecular controversy that characterized Aristotle's disagreement with Plato. Both molar and molecular analyses have their place, but molar behaviorism may apply more naturally to a variety of phenomena, ranging from the matching law and avoidance learning to socalled “higher mental processes.” When molecular analysis involves internal states, as in Staddon's Theoretical Behaviorism (or New Behaviorism), misunderstanding will be inevitable and behaviorism will be seen as one more instance of the mediational theories in which psychology has long been mired. Such theories have long dominated the physical sciences, where their usefulness is indisputable, but psychology is far behind the physical sciences and nonmediational molar behaviorism better suits a discipline that lacks the methods and the data of the established sciences.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号