全文获取类型
收费全文 | 12213篇 |
免费 | 513篇 |
国内免费 | 6篇 |
出版年
2023年 | 69篇 |
2022年 | 62篇 |
2021年 | 122篇 |
2020年 | 218篇 |
2019年 | 255篇 |
2018年 | 335篇 |
2017年 | 310篇 |
2016年 | 373篇 |
2015年 | 247篇 |
2014年 | 338篇 |
2013年 | 1322篇 |
2012年 | 564篇 |
2011年 | 559篇 |
2010年 | 416篇 |
2009年 | 422篇 |
2008年 | 588篇 |
2007年 | 568篇 |
2006年 | 503篇 |
2005年 | 438篇 |
2004年 | 476篇 |
2003年 | 431篇 |
2002年 | 420篇 |
2001年 | 183篇 |
2000年 | 201篇 |
1999年 | 193篇 |
1998年 | 196篇 |
1997年 | 159篇 |
1996年 | 110篇 |
1995年 | 147篇 |
1994年 | 144篇 |
1993年 | 134篇 |
1992年 | 131篇 |
1991年 | 115篇 |
1990年 | 114篇 |
1989年 | 116篇 |
1988年 | 112篇 |
1987年 | 109篇 |
1986年 | 88篇 |
1985年 | 105篇 |
1984年 | 119篇 |
1983年 | 100篇 |
1982年 | 112篇 |
1981年 | 115篇 |
1980年 | 105篇 |
1979年 | 104篇 |
1978年 | 111篇 |
1977年 | 90篇 |
1976年 | 95篇 |
1975年 | 66篇 |
1974年 | 76篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
241.
242.
243.
We assess evidence and arguments brought forward by Tallal (e.g., 1980) and by the target paper (Farmer & Klein, 1995) for a general deficit in auditory temporal perception as the source of phonological deficits in impaired readers. We argue that (1) errors in temporal order judgment of both syllables and tones reflect difficulty in identifying similar (and so readily confusable) stimuli rapidly, not in judging their temporal order; (2) difficulty in identifying similar syllables or tones rapidly stem from independent deficits in speech and nonspeech discriminative capacity, not from a general deficit in rate of auditory perception; and (3) the results of dichotic experiments and studies of aphasics purporting to demonstrate left-hemisphere specialization for nonspeech auditory temporal perception are inconclusive. The paper supports its arguments with data from a recent control study. We conclude that, on the available evidence, the phonological deficit of impaired readers cannot be traced to any co-occurring nonspeech deficits so far observed and is phonetic in origin, but that its full nature, origin, and extent remain to be determined. 相似文献
244.
The impact of informational feedback on the depositing of aluminum cans in recycling receptacles at a medium-sized university was investigated. Informational signs were placed over 20-recycling receptacles in three academic buildings. Each informational sign was placed at eye level, with the number of aluminum cans deposited for recycling during the previous week displayed in red digits. A 65% increase in the number of aluminum cans deposited in recycling receptacles with the informational signs was observed. Furthermore, removal of the informational signs was observed to reliably decrease the number of aluminum cans deposited. These results are discussed in the context of employing feedback to increase environmental protection behaviors. 相似文献
245.
Michael A DeVita Rade Vukmir James V Snyder Cheryl Graziano 《Kennedy Institute of Ethics journal》1995,5(1):43-49
In the preceding commentary, Campbell and Weber raise two valid and important issues concerning non-heart-beating organ donation (NHBOD). First, because the procedure links withdrawal of life support and the potential for subsequent organ donation, the desire for organs may create a situation in which care of the dying individual has relatively less importance and the dying may receive suboptimal care. Second, even if concerns about care of the dying were dealt with adequately, there will not be enough non-heart-beating donors to significantly decrease the organ shortage that exists, making the procedure not worth the risk. We agree that attention to the important details of caring for the dying are, and must be, the primary concern of all health care workers caring for those individuals. Ensuring the patients' comfort, dignity, and autonomy, and providing for family and social support are the mainstays of this care. All policies for NHBOD should clearly support and mandate these concepts. Regarding the second concern, we agree that NHBOD is currently rare; however, evidence is increasing that this type of donation has great potential. Continued growth of the practice in this country will depend largely on public acceptance, which we believe will be directly influenced by whether the public perceives that care of the dying is not compromised by this procedure. 相似文献
246.
Michael Davis 《Science and engineering ethics》1995,1(1):33-48
This article attempts to distinguish between science and technology, on the one hand, and engineering, on the other, offering
a brief introduction to engineering values and engineering ethics. The method is (roughly) a philosophical examination of
history. Engineering turns out to be a relatively recent enterprise, barely three hundred years old, to have distinctive commitments
both technical and moral, and to have changed a good deal both technically and morally during that period. What motivates
the paper is the belief that a too-easy equation of engineering with technology tends to obscure the special contribution
of engineers to technology and to their own professional standards and so, to obscure as well both the origin and content
of engineering ethics. 相似文献
247.
This comment responds to an article by Range and Cotton (1995) on reporting of parental permission and child assent procedures in published articles for 4 psychology journals. Issue is taken with the assumptions, methodology, interpretations, and implications of listing researchers in the Range and Cotton article. There is no evidence researchers failed in their ethical obligations or that children were put at risk. Reporting permission/assent in publications is not an ethical requirement. Listing researchers as "failing" to do something not part of an ethical code is lamentable. Too many unfortunate implications and problems can be derived from Range and Cotton's analysis and conclusions. 相似文献
248.
249.
Barbara E. Acker Richard E. Pastore Michael D. Hall 《Attention, perception & psychophysics》1995,57(6):863-874
Recent speech research has begun to evaluate the internal structure of categories. In one such study, Kuhl (1991) found that discrimination was poorer for vowel stimuli that were more representative of the category (prototype, or P, set) than it was for less representative stimuli (nonprototype, or NP, set). This finding was interpreted as indicating that a category prototype may function as a “perceptual magnet,” effectively decreasing perceptual distance, and thus discriminability, between stimuli. The present study examines the function of prototypes in a musical category—another natural, but nonspeech category. Paralleling the Kuhl study, representative (P) and less representative (NP) sets of major triad stimuli were constructed, based on equal temperament. Musically experienced subjects rated the stimuli in each set for goodness as a major triad, with the highest rated stimulus serving as a prototype standard for a subsequent discrimination task. Results from the discrimination task demonstrated better performance in the P context than in the NP context. The current nonspeech results indicate that a prototype functions as an anchor rather than a magnet. In addition to providing a natural, nonspeech standard for comparison with speech findings, the results provide some important insights into the nature of musical categories. 相似文献
250.
Robert H. Gilkey Michael D. Good Mark A. Ericson John Brinkman John M. Stewart 《Behavior research methods》1995,27(1):1-11
A technique is described for rapidly collecting responses in auditory-localization experiments. Subjects indicate the perceived direction of the sound by pointing at a 20-cm-diam spherical model. In Experiment 1, the subjects judged the direction of a broadband signal, which could originate from any of 239 directions ranging through 360° of azimuth and between ?45° and +90° of elevation. Using this technique, the subjects responded 2–8 times more rapidly than previous subjects who used either a verbal-reporting technique or a head-pointing technique. Localization judgments were as accurate as they had been with verbal reports, but were not as accurate as judgments collected using the head-pointing technique. In Experiment 2, the signal was turned off and the experimenter read the spherical coordinates of the signal location to the subjects. The subjects pointed to these coordinates more accurately than they had judged the direction of the sounds in Experiment 1, suggesting that the response technique had not been the limiting factor in that experiment. Circumstances relevant to the choice of response techniques for auditory-localization experiments are discussed. 相似文献