全文获取类型
收费全文 | 2571篇 |
免费 | 1004篇 |
国内免费 | 32篇 |
专业分类
3607篇 |
出版年
2019年 | 33篇 |
2016年 | 35篇 |
2015年 | 28篇 |
2013年 | 185篇 |
2012年 | 48篇 |
2011年 | 70篇 |
2010年 | 101篇 |
2009年 | 200篇 |
2008年 | 89篇 |
2007年 | 106篇 |
2006年 | 61篇 |
2005年 | 71篇 |
2004年 | 92篇 |
2003年 | 102篇 |
2002年 | 58篇 |
2001年 | 130篇 |
2000年 | 56篇 |
1999年 | 86篇 |
1998年 | 82篇 |
1997年 | 52篇 |
1996年 | 94篇 |
1995年 | 79篇 |
1994年 | 77篇 |
1993年 | 73篇 |
1992年 | 90篇 |
1991年 | 94篇 |
1990年 | 79篇 |
1989年 | 82篇 |
1988年 | 66篇 |
1987年 | 53篇 |
1986年 | 44篇 |
1985年 | 44篇 |
1984年 | 34篇 |
1982年 | 41篇 |
1981年 | 31篇 |
1980年 | 32篇 |
1979年 | 30篇 |
1973年 | 38篇 |
1972年 | 47篇 |
1971年 | 46篇 |
1970年 | 31篇 |
1969年 | 34篇 |
1968年 | 59篇 |
1967年 | 41篇 |
1966年 | 54篇 |
1965年 | 40篇 |
1964年 | 80篇 |
1963年 | 73篇 |
1962年 | 48篇 |
1961年 | 38篇 |
排序方式: 共有3607条查询结果,搜索用时 0 毫秒
151.
Previous research indicates that vasopressin-containing (LE) rats are capable of adapting to the stress of food restriction,
whereas vasopressin-deficient (DI) rats cannot adapt to this stressor. It has been postulated that abnormalities in glucose
metabolism may be one of the factors leading to the demise of food-restricted DI rats. The present study was conducted to
determine if taste preferences are altered in DI animals and if the presentation of exogenous glucose, in the form of sucrose
solutions, can ameliorate the effects of the stress of food restriction. Four different concentrations of sucrose solutions
were presented to LE and DI rats under the food-restricted condition. In both strains, an 8% sucrose solution was preferred
over 0%, 16%, and 32% concentrations, with DI rats consuming more of this concentration than LE rats. Thus, when DI rats had
the opportunity of maintaining glucose homeostasis by exogenous supplements, they maintained body weight, displayed no stomach
pathology, and survived. 相似文献
152.
In contrast to previous research on apologies, which has examined their role in enhancing impressions of those issuing them
(e.g., Darby and Schlenker, 1989), the research reported here draws upon Goffman’s (1955) analysis of the “corrective cycle”
and is concerned with constraints associated with the receipt of apologies. Study 1 examines the implications for the actor
of accepting, not accepting, or rejecting apologies. It is demonstrated that across a variety of judgments, most positive
views of the actor result when apologies are accepted; least positive views are associated with their rejection. A follow-up
study sought to establish whether this effect would occur under circumstances in which unconvincing apologies are rejected.
Results indicate that the apology’s status (convincing versus unconvincing) has no bearing on perceptions of actors. Based
on a hypothetical role-play format, Study 2 addresses the matter of whether actors experience a subjective sense of constraint
upon receipt of unsatisfactory apologies. The data suggest that there exists a pronounced tendency to accept such apologies,
though typically with conditions that would be specified to the offender. More general implications of the data are discussed. 相似文献
153.
This study presents two experiments that demonstrate that the memory trace of a tobe-remembered item develops along a dimension
(continuum) from coarse/general to fine/specific. Similarly, forgetting is shown to be a reverse movement along this dimension
from fine to coarse, as increasingly less fine attributes are lost. The attribute acquisition pattern of this Progressively
Finer Attributes Theory is robust and predictable, valid for experimentally unstructured (Experiment 2) as well as experimentally
structured (Experiment 1) material. 相似文献
154.
Conflicting findings have been reported concerning whether fluent children use more complex syntactic structures than stutterers and whether or not stutterers experience specific difficulty with complex syntactic structures. On critical examination, the first of these apparent discrepancies appears to be due to (a) differences in the methods employed for syntactic analysis in different studies, and (b) misleading impressions gained by looking at speakers within a single age range. Data were reanalyzed where one method of analysis had shown that fluent speakers and stutterers did not differ with regard to syntactic structures used but where they did show a propensity for stuttering to occur on complex syntactic structures. These data cover a range of age groups. When the second method of syntactic analysis was applied, a difference was found between fluent speakers and stutterers, with the stutterers initially using more simple structures and fewer complex ones. This difference decreased over age groups. However, a difference still remained with respect to which syntactic structures stutterers experience difficulty. An additional analysis, not formerly conducted on these data, showed that, as reported elsewhere, there was a higher probability of stuttering on clause-initial and. It was also shown that this tendency decreased with age group of the stutterers. 相似文献
155.
Fren T. Y. Smulders Albert Kok J. Leon Kenemans Theodore R. Bashore 《Acta psychologica》1995,90(1-3):97-109
An experiment was conducted to relate individual components of the event-related brain potential to specific stages of information processing in a two-choice reaction time (RT) task in a group of undergraduate students. Specifically, the latency of the P300 component and the lateralized readiness potential (LRP) were studied as a function of variations in stimulus degradation and response complexity. It was hypothesized that degrading the stimulus would delay the P300 and LRP to the same extent as RT, and that increasing response complexity would affect RT but not P300 latency. The extant literature did not permit any hypothesis regarding the effect of response complexity on LRP latency. The two task variables were found to have additive effects on RT. As predicted, variations in stimulus degradation influenced the latencies of both components, whereas alterations in response complexity had no effect on P300 latency. A significant new finding was that the onset latency of the LRP remained unchanged across levels of response complexity. The overall pattern of results supports the notion of temporal selectivity of stage manipulations that is derived from discrete stage models of human information processing. Furthermore, these results refine the functional interpretation of the LRP by indicating that within the conceptual framework of a stage model the processes this component indexes succeed the start of response choice but precede the start of motor programming. 相似文献
156.
Although the Wechsler Intelligence Scale for Children-Third Edition (WISC-III) is arguably the best instrument currently available for assessing students' intelligence, its use will present practitioners, especially school psychologists, with some unique challenges. Recent research suggests that significant reductions in special education students' WISC-III Verbal, Performance, and Full Scale IQ scores will be found, compared with their previous WISC-R results. This finding will have a profound impact on special education placement decisions. Specifically, students who were previously found eligible for learning disability programs may now no longer evidence the significant discrepancies necessary in order to receive continued services. Conversely, students earlier identified as “slow learners” may now be eligible to receive services for those classified under the category of educably mentally handicapped. In addition, the notion that the WISC-III may underestimate the ability of certain populations of students requires further exploration. This article will address these issues as well as implications for practitioners presently administering the WISC-III. 相似文献
157.
158.
159.
160.
The purpose of this investigation was to further define the role of anxiety sensitivity, in relation to physiological arousal and the cognitive perception of anxiousness, as a determinant of anxiety. One hundred and thirty-two undergraduates at an urban university served as subjects. Two physiological measures of arousal and two cognitive measures of anxiety were used following an anxiety inducing task (mental arithmetic). The general expectation, which was supported, was that individual differences in anxiety sensitivity levels are more closely related to subjects' reported anxiousness in stressful conditions than are the actual physiological changes. Additionally, anxiety sensitivity was related to poststress levels of anxiety whereas trait anxiety was only related to pre- and postrelaxation levels of anxiety. Implications of the findings are addressed. 相似文献