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   2037篇
  免费   203篇
  国内免费   281篇
  2024年   15篇
  2023年   55篇
  2022年   55篇
  2021年   82篇
  2020年   133篇
  2019年   138篇
  2018年   114篇
  2017年   120篇
  2016年   117篇
  2015年   75篇
  2014年   109篇
  2013年   249篇
  2012年   74篇
  2011年   84篇
  2010年   60篇
  2009年   93篇
  2008年   133篇
  2007年   120篇
  2006年   121篇
  2005年   101篇
  2004年   81篇
  2003年   73篇
  2002年   49篇
  2001年   44篇
  2000年   42篇
  1999年   28篇
  1998年   29篇
  1997年   23篇
  1996年   14篇
  1995年   21篇
  1994年   13篇
  1993年   15篇
  1992年   5篇
  1991年   7篇
  1990年   4篇
  1989年   2篇
  1988年   2篇
  1986年   4篇
  1985年   4篇
  1984年   4篇
  1983年   3篇
  1981年   2篇
  1980年   1篇
  1978年   1篇
  1976年   1篇
  1975年   1篇
排序方式: 共有2521条查询结果,搜索用时 15 毫秒
941.
A conception of an information system has been introduced by Pawlak. The study has been continued in works of Pawlak and Orlowska and in works of Vakarelov. They had proposed some basic relations and had constructed a formal system of a modal logic that describes the relations and some of their Boolean combinations. Our work is devoted to a generalization of this approach. A class of relation systems and a complete calculus construction method for these systems are proposed. As a corollary of our main result, our paper contains a solution of a Vakarelov's problem: how to construct a formal system that describes all the Boolean combinations of the basic relations.  相似文献   
942.
We examined the effects of a combined education and token system intervention to improve adherence to inhaled corticosteroids for an 8-year-old girl and a 10-year-old boy with asthma. Adherence was measured by an electronic chronolog monitor, and disease outcome was assessed by repeated pulmonary function testing. A withdrawal design demonstrated improved adherence and, for 1 child, an associated improvement in pulmonary function occurred. Methodological and clinical implications are discussed, including variables other than adherence that may affect disease outcome.  相似文献   
943.
广告作品评价系统的心理学研究   总被引:2,自引:0,他引:2  
本研究从1990年至1991年,在全国许多城市对消费者的电视和报纸广告作品的一般性评价进行了调查,分别获得了五至六个基本评价因素:可信度、吸引力、适合度、感染力、认知力和必要信息;通过控制试验,又获得了它们的相对重视度和广告作品评价的数学模型: B=∑a_k ·r_(kj)  相似文献   
944.
Five rats pressed levers on variable-interval schedules of water reinforcement at various levels of water deprivation. In one phase of the experiment, three deprivation conditions that replicated conditions in Heyman and Monaghan (1987) were arranged, along with three less extreme deprivation conditions. In a second phase, water deprivation was arranged so that subjects were exposed to a greater range of access to water per day. Herrnstein's hyperbola described the rats' response-rate data well. The y asymptote, k, of the hyperbola appeared roughly constant over the conditions that replicated those of Heyman and Monaghan, but decreased markedly when less extreme deprivation conditions were included. In addition, k varied systematically when the second method of arranging deprivation was used. These results falsify a strong form of matching theory and confirm predictions made by linear system theory.  相似文献   
945.
香港特别行政区政府委托美国哈佛大学一个专家小组对香港的医疗制度作了一个全面评估,并就目前的融资安排(financialarrangement)提出改革方案。小组发表的报告对香港医疗制度作了很多中肯批评,但所提出的融资改革方案却极受争议。方案的主要缺点是违背医疗二级制的精神,令自由选择、关怀和社会公义(socialjustice)等价值难以得到实现。  相似文献   
946.
This article reviews contemporary Russian research aimed at integrating and combining qualitative and quantitative evaluation approaches using Luria's procedures of neuropsychological assessment. A scoring system for rating and evaluating cognitive disturbances in different functional areas is described. The advantages of application of this system are discussed, using as examples the neuropsychological follow-up of neurosurgical patients, as well as neuropsychological research into the cognitive disturbances in patients with Parkinsonism and in children who are mentally retarded. The effectiveness of these updates to Luria's approach is demonstrated.  相似文献   
947.
Rather than begin by defining what we mean when we call a paper 'clinical', I would like to reflect on how such a piece of work originates, how, through the interplay between the written and the spoken word, it becomes clinical and good enough for a professional journal.
In the following, I shall pay particular attention to recent publications from the editorial side, that is, those by Wharton, one of the three editors of The Journal of Analytical Psychology , and by Tuckett, editor of The International Journal of Psycho-Analysis . I shall plead that there should not only be one kind of clinical paper, namely the type that for political reasons seems to be the one that is most wanted at the present time and the aim of which is to put psychoanalysis on more secure foundations than it currently is.  相似文献   
948.
The recent turn to the context of discovery and other postmodernist developments in the philosophy of science have undermined the idea of a universal rationality of science. This parallels the fate of the classical dream of a logic of discovery. Still, justificational questions have remained as a distinct perspective, though comprising both consequential and generative justification — an insight delayed by certain confusions about the (original) context distinction. An examination of one particular heuristic strategy shows its local rationality; even as an efficient procedure of hypothesis generation, it carries probative weight. It will be explored in which respects such a strategy can be normative or contain normative elements.Parts of this paper were published, in summary fashion, in Kirschenmann (1989).  相似文献   
949.
Cooperative learning and group contingencies   总被引:1,自引:0,他引:1  
This paper discusses the similarities and differences between cooperative learning and group contingencies. Cooperative learning refers to any methods in which students work together to help one another learn, while group contingencies refer to rewarding students based on the performance of a group. Research on the achievement effects of cooperative learning finds that these methods are effective primarily when they incorporate group contingencies, when groups are rewarded based on the average of their members' individual learning performances. The use of group contingencies within cooperative learning is hypothesized to motivate students to do a good job of explaining concepts and skills to their groupmates, and elaborated explanation is the principal behavior found to account for achievement gains in cooperative learning.  相似文献   
950.
The mathematical theory of linear systems has been used successfully to describe responding on variable-interval (VI) schedules. In the simplest extension of the theory to the variable-ratio (VR) case, VR schedules are treated as if they were VI schedules with linear feedback loops. The assumption entailed by this approach, namely, that VR and VI-plus-linear-feedback schedules are equivalent, was tested by comparing responding on the two types of schedule. Four human subjects' lever pressing produced monetary reinforcers on five VR schedules, and on five VI schedules with linear feedback loops that reproduced the feedback properties of the VR schedules. Pressing was initiated by instructions in 2 subjects, and was shaped by successive approximation in the other 2. The different methods of response initiation did not have differential effects on behavior. For each of the 4 subjects, the VR and the comparable VI-plus-linear-feedback schedules generated similar average response rates and similar response patterns. The subjects' behavior on both types of schedule was similar to that of avian and rodent species on VR schedules. These results indicate that the assumption entailed by the VI-plus-linear-feedback approach to the VR case is valid and, consequently, that the approach is worth pursuing. The results also confute interresponse-time theories of schedule performance, which require interval and ratio contingencies to produce different response rates.  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