全文获取类型
收费全文 | 2226篇 |
免费 | 70篇 |
国内免费 | 3篇 |
出版年
2021年 | 10篇 |
2020年 | 34篇 |
2019年 | 40篇 |
2018年 | 53篇 |
2017年 | 60篇 |
2016年 | 59篇 |
2015年 | 37篇 |
2014年 | 51篇 |
2013年 | 277篇 |
2012年 | 89篇 |
2011年 | 94篇 |
2010年 | 66篇 |
2009年 | 58篇 |
2008年 | 76篇 |
2007年 | 103篇 |
2006年 | 73篇 |
2005年 | 78篇 |
2004年 | 70篇 |
2003年 | 61篇 |
2002年 | 82篇 |
2001年 | 36篇 |
2000年 | 38篇 |
1999年 | 33篇 |
1998年 | 35篇 |
1997年 | 32篇 |
1996年 | 31篇 |
1995年 | 19篇 |
1994年 | 29篇 |
1993年 | 25篇 |
1992年 | 29篇 |
1991年 | 22篇 |
1990年 | 20篇 |
1989年 | 18篇 |
1988年 | 15篇 |
1987年 | 15篇 |
1986年 | 21篇 |
1985年 | 18篇 |
1984年 | 28篇 |
1983年 | 25篇 |
1982年 | 31篇 |
1981年 | 28篇 |
1980年 | 26篇 |
1979年 | 22篇 |
1978年 | 29篇 |
1977年 | 25篇 |
1976年 | 21篇 |
1975年 | 16篇 |
1974年 | 22篇 |
1973年 | 23篇 |
1967年 | 11篇 |
排序方式: 共有2299条查询结果,搜索用时 31 毫秒
921.
Robert Kail James Pellegrino Philip Carter 《Journal of experimental child psychology》1980,29(1):102-116
Subjects from Grades 3, 4, 6, and college judged whether pairs of stimuli were identical or mirror-image reversals. One stimulus of a pair was presented upright; the other was rotated 0 to 150° from the standard. The pairs were either alphanumeric symbols or unfamiliar, letter-like characters of the type found on the PMA Spatial Ability Test. Response latencies were measured. The primary results were that (a) the speed of mental rotation increased with development, (b) unfamiliar characters were rotated more slowly than alphanumeric characters, by approximately the same amount at each grade, and (c) unfamiliar characters were encoded and compared more slowly than alphanumeric symbols, by an amount that declined with development. The results are discussed in terms of the component processes that underlie developmental change and individual variation in mental rotation skill. 相似文献
922.
Sixty-four infants, eight boys and eight girls at each of four ages, months, were observed during a 15-minute free play session. Three types of play (stereotypical, relational, and functional) and the number of appropriate uses for specific realistic toys were recorded. Stereotypical play (87% of total active play at months) gave way to relational (35% at months) and functional play (52% at months) as the dominant activity. Both functional play and the number of different appropriate uses of toys were rare at months, appeared reliably at months and increased lineraly through months. A change in the quality of play from indiscriminate mouthing, waving, banging, and fingering of objects to the matching of appropriate uses for a large array of toys indicates that the child's manipulations become more object specific and functional over this 6-month age span. Among possible explanations for the linear increase in the frequency and diversity of appropriate toy uses is the suggestion that an important cognitive change occurs toward the end of the first year of life. A case study is presented to illustrate the application of the play procedure for both assessment and treatment. 相似文献
923.
Stephen Handel Shiro Imai Philip Spottswood 《Attention, perception & psychophysics》1980,28(3):205-212
Subjects classified sets of two-dimensional stimuli into two or three groups in any way they wished. For integral stimuli, classification was based on numerical balance and the similarity structure. For separable stimuli, classification was based on the dimensional structure and the configurai properties of the stimulus set. These results replicate and extend those of Handel and Imai (1972). In addition, they suggest that no closed set of stimulus concepts is possible. 相似文献
924.
Milgram et al. (1972) proposed the formula R = f(C X D) for the recognition of city scenes where R = Recognition, C = Centrality to the population flow and D = architectural or social distinctiveness. In this paper a slight modification to this formula was suggested. The centrality concept was replaced by the more adequate one of familiarity and an empirical test of the proposition was carried out. Fifty-four scenes of urban Adelaide, South Australia were chosen using the two techniques of fixed distance sampling along major roads and equivalent representation sampling from the entire urban area. High School students (N = 41) and University Students (N = 31) were shown colour slides and ratings were obtained for recognition and distinctiveness. Familiarity was assessed using frequency of travel patterns. Multiple regression analyses showed that frequency of encounter was the only significant predictor variable in the younger High School sample, but distinctiveness and frequency were both significant for the University sample. A possible explanation for this difference in terms of car usage is outlined and some critical comments on the distinctiveness concept are presented. 相似文献
925.
Frederic J. Medway Philip Delp Carol Ierace Susan Lazarus Karen Westphal 《Journal of School Psychology》1978,16(1):34-41
A survey was sent to doctoral school psychologists to determine their research productivity and topical interests. Approximately two thirds of 147 respondents indicated doing some research during 1974–1975. Studies dealing with topics of assessment and program evaluation were most prevalent. Only about one in five studies was actually published and most of these were in nonprestigious periodicals. Academic school psychologists were more likely to do research and publish than were applied school psychologists. Academic and applied psychologists did not differ in terms of numbers of unpublished written or oral research reports. The correspondence of these results with prior data on school psychology research was noted and suggestions to increase the circulation of research findings are presented. 相似文献
926.
Three experiments attempted to clarify the effect of altering the spatial presentation of irrelevant auditory information. Previous research using serial recall tasks demonstrated a left-ear disadvantage for the presentation of irrelevant sounds (). Experiments 1 and 2 examined the effects of manipulating the location of irrelevant sound on either a mental arithmetic task () or a missing-item task (; Experiment 4). Experiment 3 altered the amount of change in the irrelevant stream to assess how this affected the level of interference elicited. Two prerequisites appear necessary to produce the left-ear disadvantage; the presence of ordered structural changes in the irrelevant sound and the requirement for serial order processing of the attended information. The existence of a left-ear disadvantage highlights the role of the right hemisphere in the obligatory processing of auditory information. 相似文献
927.
This paper shows that the non-Boolean logic of quantum measurementsis more naturally represented by a relatively new 4-operationsystem of Boolean fractionsconditional eventsthanby the standard representation using Hilbert Space. After therequirements of quantum mechanics and the properties of conditionalevent algebra are introduced, the quantum concepts of orthogonality,completeness, simultaneous verifiability, logical operations,and deductions are expressed in terms of conditional eventsthereby demonstrating the adequacy and efficacy of this formulation.Since conditional event algebra is nearly Boolean and consistsmerely of ordered pairs of standard events or propositions,quantum events and the so-called "superpositions" of statesneed not be mysterious, and are here fully explicated. Conditionalevent algebra nicely explains these non-standard "superpositions"of quantum states as conjunctions or disjunctions of conditionalevents, Boolean fractions, but does not address the so-called"entanglement phenomena" of quantum mechanics, which remainphysically mysterious. Nevertheless, separating the latter phenomenafrom superposition issues adds clarity to the interpretationof quantum entanglement, the phenomenon of influence propagatedat faster than light speeds. With such treacherous possibilitiespresent in all quantum situations, an observer has every reasonto be completely explicit about the environmentalinstrumentalconfiguration, the conditions present when attempting quantummeasurements. Conditional event algebra allows such explicationwithout the physical and algebraic remoteness of Hilbert space. 相似文献
928.
Nickel PJ 《Theoretical medicine and bioethics》2006,27(3):245-264
This paper advances a new criterion of a vulnerable population in research. According to this criterion, there are consent-based and fairness-based reasons for calling a group vulnerable. The criterion is then applied to the case of people with serious illnesses. It is argued that people with serious illnesses meet this criterion for reasons related to consent. Seriously ill people have a susceptibility to “enticing offers” that hold out the prospect of removing or alleviating illness, and this susceptibility reduces their ability to safeguard their own interests. This explains the inclusion of people with serious illnesses in the Belmont Report’s list of populations needing special protections, and supports the claim that vulnerability is the rule, rather than the exception, in biomedical research. 相似文献
929.
Cleland AA Gaskell MG Quinlan PT Tamminen J 《Journal of experimental psychology. Human perception and performance》2006,32(1):104-119
The authors report 3 dual-task experiments concerning the locus of frequency effects in word recognition. In all experiments, Task 1 entailed a simple perceptual choice and Task 2 involved lexical decision. In Experiment 1, an underadditive effect of word frequency arose for spoken words. Experiment 2 also showed underadditivity for visual lexical decision. It was concluded that word frequency exerts an influence prior to any dual-task bottleneck. A related finding in similar dual-task experiments is Task 2 response postponement at short stimulus onset asynchronies. This was explored in Experiment 3, and it was shown that response postponement was equivalent for both spoken and visual word recognition. These results imply that frequency-sensitive processes operate early and automatically. 相似文献
930.
Venner KL Wall TL Lau P Ehlers CL 《Cultural diversity & ethnic minority psychology》2006,12(4):632-643
The Orthogonal Cultural Identification Scale (OCIS; Oetting & Beauvais, 1990-91) has been validated among Native American youth, but not adults. The present study sought to test the reliability (internal consistency) and validity (construct and factorial) of the OCIS among an adult Native American sample consisting of 389 Mission Indians (61% female). Participants were recruited from reservations using a venue sampling strategy. The OCIS was completed as part of a self-assessment packet of questionnaires. Internal consistency for OCIS subscale scores ranged from 0.76 to 0.91. Both concurrent and discriminant validity were demonstrated. Confirmatory factor analysis revealed 2 factors: (1) Anglo American Identification and (2) Native American Identification. These results indicate the OCIS is a reliable and valid instrument for use with adult Native Americans. 相似文献