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   120篇
  免费   6篇
化学   17篇
综合类   25篇
数学   25篇
物理学   59篇
  2023年   3篇
  2019年   1篇
  2016年   2篇
  2015年   2篇
  2014年   7篇
  2013年   13篇
  2012年   12篇
  2011年   7篇
  2010年   10篇
  2009年   5篇
  2008年   8篇
  2007年   7篇
  2006年   2篇
  2005年   5篇
  2004年   8篇
  2003年   7篇
  2002年   2篇
  2001年   1篇
  2000年   6篇
  1999年   3篇
  1998年   2篇
  1997年   3篇
  1996年   1篇
  1995年   2篇
  1994年   1篇
  1991年   1篇
  1989年   1篇
  1988年   3篇
  1966年   1篇
排序方式: 共有126条查询结果,搜索用时 62 毫秒
61.
This paper studies the relations between agent performances and their intellective abilities in mix-games in which there are two groups of agents: one group plays a minority game and the other plays a majority game. These two groups have different historical memories and different time horizons. It is found that these relations are greatly influenced by the configurations of historical memories of the two groups.  相似文献   
62.
We provide an overview of the participatory learning paradigm (PLP) and discuss the importance of the acceptance function in determining which observations are used for learning. We introduce a formal model that uses this (PLP) We then extend this model in two directions. First, we consider situations in which we have incomplete observations, we only have observations about a subset of the variables of interest. Next we extend this model to allow for the inclusion in the learning process of information about the learning agents belief about the credibility of the source of the learning experience. Here we distinguish between the content of a learning experience and the source of the experience. We provide a means to allow the learning agents belief about the credibility of the source to determine the effect of the content. Furthermore we suggest a method to allow the modification of agents belief about the credibility of the source to also be part of the learning process.  相似文献   
63.
邓洪  廖齐 《光谱实验室》2011,28(6):3204-3206
采用高固色率的双活性基M型活性染料对速生人工林木材进行染色,均有很好的易染性和渗透性以及较高的上染率。利用不同种类固色剂对活性染料染色单板进行处理,利用分光光度法,分别测定未经和经固色剂处理的活性染料染色单板热水浸泡液的分光光度值,可知分别经3种环保型固色剂处理后的活性染料染色单板的耐水色牢度均有不同程度的提高,其中以NRT处理过的染色单板的耐水色牢度最佳。  相似文献   
64.
以混合丙烯酸盐、膨润土、琼脂等为原料,利用微波辅助合成复合保水剂.通过XRD和IR表征复合保水剂的微观特征,研究膨润土用量、交联剂、中和度及琼脂添加量对吸水倍率的影响.结果表明:膨润土、琼脂与单体聚合良好.复合保水剂吸水倍率达588.6g/g,吸生理盐水倍率达112.8g/g.  相似文献   
65.
随着电子商务的迅速发展以及Agent理论和方法的引入,出现了关于Agent自动谈判等方面的研究。 A-gent劝说由于能节约商务谈判成本,提高商务谈判效率,使谈判过程更加理性,解决谈判中出现的许多问题,受到了广泛的关注。本文结合人际劝说理论,对Agent劝说进行了分类;结合形式化理论,构建了相应的形式化表述模型和交互机制;然后将两者相结合,在让步影响幅度的基础上,构建了基于Agent劝说分类的让步模型;最后,通过算例和系统实现对模型的可行性、有效性进行了验证。  相似文献   
66.
多值移位型计数器设计   总被引:1,自引:0,他引:1       下载免费PDF全文
分析和讨论了基于全状态图的多值移位型计数器的设计方法,指出了当将该方法用于更多值的移位型计数器的设计时,将变得非常复杂,失去了直观性和方便性的特点.提出了多值全状态表及基于全状态表的多值移位型计数器设计方法.此方法能解决上述问题,并给出了二变量四值移位型计数器的设计实例.  相似文献   
67.
研究了一类Dynkin型非线性反馈移位寄存器,给出了n长码是Dn型反馈函数的周期码的充分必要条件,并得出了所有周期码及其周期。  相似文献   
68.
Changes in vocal tract configuration during singing were studied in four semiprofessional countertenors and one professional bass-baritone, by means of fiberoptic laryngoscopy. All of the countertenors showed a marked narrowing of the lower pharynx with increasing pitch when they used their countertenor voice (CT voice) but only a slight narrowing when using their baritone voice (B voice). The bass-baritone's pharynx remained unchanged with increasing pitch. Increasing loudness gave a widening of the pharynx in three of the four countertenors' CT voices, whereas no change was observed for the countertenors' B voices or for the bass-baritone voice. Vocal fold length seemed to decrease in one countertenor's B voice and in the bass-baritone with increasing loudness. Thus, the countertenors in this study exhibit several characteristic patterns of vocal tract gestures in countertenor voice that differ from both their own baritone voices and from the bass-baritone.  相似文献   
69.
阮子宁  刘强  姚金水 《化学通报》2015,78(3):201-201
摘要 重金属污染已成为影响人们生活亟亟待解的问题,它不仅威胁着自然环境的持续发展,更是对人类身体健康提出了严峻的考验。其中,六价铬因为环境污染持续久,危害大,更是得到各国研究者的重视。研究者们研究了各种吸附材料,它们对于六价铬的移除能力以及移除机理不尽相同。本文介绍了Cr(VI)吸附材料分类及其特点,重点分析了聚合物吸附材料在吸附和分离Cr(VI)方面的应用进展。并简要介绍了Cr(VI)吸附过程中的吸附动力学模型和等温方程式,以著名的Langmuir和Freundlich模型为例加以说明,为解决重金属铬离子引起的环境污染尤其水污染问题提供一种借鉴。  相似文献   
70.
This article argues that the agent‐based computational model permits a distinctive approach to social science for which the term “generative” is suitable. In defending this terminology, features distinguishing the approach from both “inductive” and “deductive” science are given. Then, the following specific contributions to social science are discussed: The agent‐based computational model is a new tool for empirical research. It offers a natural environment for the study of connectionist phenomena in social science. Agent‐based modeling provides a powerful way to address certain enduring—and especially interdisciplinary—questions. It allows one to subject certain core theories—such as neoclassical microeconomics—to important types of stress (e.g., the effect of evolving preferences). It permits one to study how rules of individual behavior give rise—or “map up”—to macroscopic regularities and organizations. In turn, one can employ laboratory behavioral research findings to select among competing agent‐based (“bottom up”) models. The agent‐based approach may well have the important effect of decoupling individual rationality from macroscopic equilibrium and of separating decision science from social science more generally. Agent‐based modeling offers powerful new forms of hybrid theoretical‐computational work; these are particularly relevant to the study of non‐equilibrium systems. The agent‐based approach invites the interpretation of society as a distributed computational device, and in turn the interpretation of social dynamics as a type of computation. This interpretation raises important foundational issues in social science—some related to intractability, and some to undecidability proper. Finally, since “emergence” figures prominently in this literature, I take up the connection between agent‐based modeling and classical emergentism, criticizing the latter and arguing that the two are incompatible. © 1999 John Wiley & Sons, Inc.  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