全文获取类型
收费全文 | 2582篇 |
免费 | 130篇 |
国内免费 | 4篇 |
专业分类
2716篇 |
出版年
2023年 | 18篇 |
2022年 | 27篇 |
2021年 | 42篇 |
2020年 | 48篇 |
2019年 | 59篇 |
2018年 | 75篇 |
2017年 | 85篇 |
2016年 | 102篇 |
2015年 | 61篇 |
2014年 | 78篇 |
2013年 | 310篇 |
2012年 | 137篇 |
2011年 | 119篇 |
2010年 | 104篇 |
2009年 | 81篇 |
2008年 | 122篇 |
2007年 | 111篇 |
2006年 | 115篇 |
2005年 | 94篇 |
2004年 | 86篇 |
2003年 | 85篇 |
2002年 | 77篇 |
2001年 | 49篇 |
2000年 | 44篇 |
1999年 | 41篇 |
1998年 | 24篇 |
1997年 | 18篇 |
1996年 | 34篇 |
1995年 | 20篇 |
1994年 | 17篇 |
1993年 | 17篇 |
1992年 | 32篇 |
1991年 | 22篇 |
1990年 | 21篇 |
1988年 | 23篇 |
1987年 | 20篇 |
1986年 | 19篇 |
1985年 | 13篇 |
1984年 | 23篇 |
1982年 | 13篇 |
1980年 | 13篇 |
1979年 | 11篇 |
1978年 | 10篇 |
1975年 | 12篇 |
1974年 | 10篇 |
1973年 | 14篇 |
1972年 | 19篇 |
1971年 | 11篇 |
1969年 | 11篇 |
1968年 | 15篇 |
排序方式: 共有2716条查询结果,搜索用时 15 毫秒
51.
Henry J. De Haan 《Attention, perception & psychophysics》1982,32(1):27-31
The relationship between subjective estimates of the comprehensibility of connected, freerunning speech and rate of speech was investigated for each of two types of time-compressed speech: pitch-varying speeded speech and pitch-normalized compressed speech. The midpoints of the resulting functions approximated the values obtained by a previously described speechrate tracking method. For equivalent degrees of comprehensibility, rates were higher for compressed speech than for speeded speech, indicating that estimates are sensitive to the intelligibility of speech. Subjective estimates of comprehensibility of time-compressed speech provide a means of assessing the itelligibility of connected speech. 相似文献
52.
Through a one-year internship, counselors develop attitudes and competencies needed to promote the career development of handicapped high school students. This new specialty in the counseling field, although it incorporates elements of rehabilitation, school, and vocational counseling, occurs within the framework of special education classes in regular high schools, and therefore is markedly different from any existing specialty. The role model developed in this project, now in its fifth year, stresses outreach, planning, and an active part for the counselor. This approach has been found effective both with handicapped and with learning disabled students in several urban schools. 相似文献
53.
Two pigeons were trained to peck a key under a free-operant avoidance schedule. Then, changes in key color signalled the beginning (safe period) and the end (warning period) of the response-shock interval, with a response required to change the key color. Finally, a change in key color signalled the warning period and either a response or a shock reinstated the safe stimulus. During signalled avoidance, response rate was higher during the warning stimulus than during the safe stimulus. More responding tended to occur in the warning stimulus when it was terminated by either a response or a shock than by only a response. In either procedure, response latency during the warning stimulus was a function of the duration of the warning stimulus. In general, response and shock rate were higher during unsignalled than during signalled avoidance. When the warning stimulus was brief, the results were similar to those of unsignalled avoidance. These results confirm previous findings with pigeons, are in general agreement with data provided by other species in studies of signalled avoidance, and thereby indicate the transituationality of the key-pecking operant. 相似文献
54.
P G De Benedetti A Rastelli G Vampa A Albasini 《Psychiatrie, Neurologie, und medizinische Psychologie》1976,31(3):159-168
The electronic structures of anionic, imidic and amidic forms of sulphonamides were investigated and compared by means of I.R., Raman and U.V. spectroscopy. Indices reflecting the electronic situation of the common moiety p-H2N-C6H4-SO2 was a whole, although not necessarily related, physically, to any event taking place in the biological processes, were found to correlate with the in vitro bacteriostatic activity of the specific individual forms. The influence of N1-substituents both on the SO2 electronic features and on the coupling between the para amino group and the phenyl ring was discussed. It resulted that the most active chemical species, in this class of compounds, are characterized, electronically, by the most electron-rich common moiety and, in particular, by the most negative oxygens in the SO2 group and the most available (less engaged) lone-pair in the rho-amino group. These conclusions give a new settlement both to the problem of resonance and to the relation between resonance effects and bacteriostatic activity in this class of compounds. 相似文献
55.
56.
57.
58.
59.
Linda De Bottari 《Journal of counseling and development : JCD》1969,47(7):675-678
This study is an investigation of the relationship between third grade final marks, achievement test scores, and subsequent achievement in elementary and secondary school. It was focused on the early identification of students for whom changes in the curriculum might be indicated. 相似文献
60.
Jrg Stolz Detlef Pollack Nan Dirk De Graaf Jean‐Philippe Antonietti 《Journal for the scientific study of religion》2021,60(1):83-102
The sociological literature has produced a remarkably consistent picture of the quantitative patterns of religious disaffiliations in Western countries. This article argues, and demonstrates, that strong changes in a social context may lead individuals to disaffiliate rapidly, leading to very different aggregate effects from those in the “western model.” We use the unique situation of the separation of Germany from 1949 to 1989 and its subsequent reunification as a “natural experiment” to show just how much the relationships routinely found can be disrupted under changed conditions. The state socialist “treatment” affected religious disaffiliations in East Germany profoundly as it (a) made disaffiliations 10 times more probable in the East than in the West in the 1950s and 1960s, (b) shielded East German church members from factors that led to mass disaffiliations in the West in the late 1960s and early 1970s, (c) reversed the education‐disaffiliation link in the East, thus making disaffiliation more likely among the less educated, and (d) led to an especially strong increase in disaffiliations in the East right after the reunification 相似文献