全文获取类型
收费全文 | 20696篇 |
免费 | 12篇 |
出版年
2021年 | 4篇 |
2020年 | 5篇 |
2019年 | 6篇 |
2018年 | 3490篇 |
2017年 | 2824篇 |
2016年 | 2249篇 |
2015年 | 192篇 |
2014年 | 83篇 |
2013年 | 102篇 |
2012年 | 567篇 |
2011年 | 2392篇 |
2010年 | 2519篇 |
2009年 | 1473篇 |
2008年 | 1704篇 |
2007年 | 2177篇 |
2006年 | 34篇 |
2005年 | 218篇 |
2004年 | 180篇 |
2003年 | 116篇 |
2002年 | 66篇 |
2001年 | 34篇 |
2000年 | 65篇 |
1999年 | 19篇 |
1998年 | 24篇 |
1997年 | 23篇 |
1996年 | 10篇 |
1995年 | 4篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1991年 | 5篇 |
1990年 | 8篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 6篇 |
1985年 | 3篇 |
1983年 | 6篇 |
1982年 | 6篇 |
1981年 | 6篇 |
1979年 | 6篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 8篇 |
1975年 | 3篇 |
1974年 | 8篇 |
1972年 | 3篇 |
1971年 | 5篇 |
1970年 | 4篇 |
1969年 | 4篇 |
1968年 | 3篇 |
1960年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
22.
A design for an Apple II interface that senses relative rotary position and/or motion via a digital potentiometer is presented. A thorough discussion of the circuit’s theory of operation and a fully commented BASIC software listing are included. Suggested applications include an infinite-turn rotary device for psychophysical methods of adjustment, the sensing of rotary translations of a steering wheel in a driving simulator, and a digital tachometer/odometer for tracking performance on stationary exercise bicycles and treadmills. 相似文献
23.
24.
In the mid 1980s it was apparent that the need for organ donors exceeded those willing to donate. Some University of Pittsburgh Medical Center (UPMC) physicians initiated discussion of possible new organ donor categories including individuals pronounced dead by traditional cardiac criteria. However, they reached no conclusion and dropped the discussion. In the late 1980s and the early 1990s, four cases arose in which dying patients or their families requested organ donation following the elective removal of mechanical ventilation. Controversy surrounding these cases precipitated open discussion of the use of organ donors pronounced dead on the basis of cardiac criteria. Prolonged deliberations by many committees in the absence of precedent ultimately resulted in what is, to our knowledge, the country's first policy for organ donation following elective removal of life support. The policy is intricate and conservative. Care was taken to include as many interested parties as possible in an effort to achieve representative and broad based support. This paper describes the development of the UPMC policy on non-heart-beating organ donation. 相似文献
25.
Maryhelen Snyder 《Journal of Family Therapy》1993,15(1):81-86
In the context of family therapy's task of serving families, the purpose of theorizing is ultimately practical. It is a prevailing cultural practice among intellectuals to use up a vast amount of 'space' in our brains and in the pages of our journals theorizing at a great distance from the practical. One of the reasons for this distance from the practical may be the sophistic habit of argumentativeness. An alternative is proposed in which priority is given to the practical and dialogue is focused on the co-creation of meanings. 相似文献
26.
Rodger Beehler 《Studies in Philosophy and Education》1990,10(4):315-335
The essay examines the argument advanced by E.D. Hirsch, Jr., for instituting ‘cultural literacy’ as a fundamental priority of schools. A number of confusions and equivocations in Hirsch's reasoning are identified, and the propensity of his project to indoctrinate is exposed. Among the features of Hirsch's argument shown to be troubling are his shifting construal of ‘language’, his inconsistency about the requirements of cultural literacy, and his uncritical relation to traditional images of the American past and present. The upshot is to raise the question why Hirsch's project has elicited wide support and praise. 相似文献
27.
Curtis W. Hart Robin Scroggs Claude Barbre Antoinette Goodwin Philip Paris Mark J. Hanson Kathryn Madden Annette G.E. Esser Raymond J. Lawrence Jr. Jilisa Snyder Karen A. Monk George M. Klee Loy McGill Jill Carlen Kirby Thandeka Pamela Davis Barnett Gregory Forte J.J. Haines Barry Ulanov Elizabeth MacDonald 《Journal of religion and health》1997,36(1):81-104
28.
In 1949, the neurologist Juhn Wada reported the first use of a new procedure for determining the localization of speech and language in neurological patients: examination of the effects on speech and language after injecting a barbiturate, sodium amytal, into the internal carotid artery of each hemisphere in succession. By the 1960s, Wada'sIntracarotid Amobarbital Procedure,orIAP,had become the method of choice for identifying the speech-dominant side in one kind of neurological patient, persons with epilepsy who are candidates for surgical resection, and it remains so today. In 1941, however, an American neurosurgeon, W. James Gardner, reported his use of a different anesthetization procedure for speech localization in neurological patients. Instead of injecting sodium amytal through the blood supply, as in the IAP, Gardner injected procaine hydrochloride directly into cortical tissue. In this paper, we provide a brief biography of Gardner. We then discuss his method of cortical anesthetization, the theoretical and empirical background guiding his use of this method and his choice of patients, and, finally, the fate of Gardner's method within the scientific community. 相似文献
29.
30.
Jörg R. J. Schirra 《Kognitionswissenschaft》1997,6(4):177-195
How can we explain that an assertion on something perceived can be understood in the same manner by somebody who cannot perceive that scene? This problem bases the interest in computational linguistics in how listener modeling could possibly be harmonized with reference semantics. Mental images substituting real perception appear as a way out. The architecture of the listener model has to be adapted to the creation and use of such pictorial data structures. Furthermore, the relation between the latter and a verbal (i. e., propositional) representation must be understood. The resulting architecture of a listener model with reference semantics can be employed to solve communicational problems from three general classes in a better way, as is demonstrated by an example implementation. 相似文献