全文获取类型
收费全文 | 4857篇 |
免费 | 147篇 |
国内免费 | 3篇 |
出版年
2022年 | 46篇 |
2021年 | 54篇 |
2020年 | 95篇 |
2019年 | 103篇 |
2018年 | 176篇 |
2017年 | 147篇 |
2016年 | 161篇 |
2015年 | 94篇 |
2014年 | 99篇 |
2013年 | 425篇 |
2012年 | 170篇 |
2011年 | 153篇 |
2010年 | 101篇 |
2009年 | 120篇 |
2008年 | 138篇 |
2007年 | 137篇 |
2006年 | 119篇 |
2005年 | 108篇 |
2004年 | 95篇 |
2003年 | 77篇 |
2002年 | 76篇 |
2001年 | 133篇 |
2000年 | 98篇 |
1999年 | 90篇 |
1997年 | 50篇 |
1996年 | 48篇 |
1993年 | 58篇 |
1992年 | 64篇 |
1991年 | 72篇 |
1990年 | 61篇 |
1989年 | 61篇 |
1988年 | 67篇 |
1987年 | 59篇 |
1986年 | 50篇 |
1985年 | 59篇 |
1984年 | 60篇 |
1983年 | 48篇 |
1982年 | 52篇 |
1979年 | 58篇 |
1978年 | 57篇 |
1977年 | 52篇 |
1976年 | 46篇 |
1975年 | 64篇 |
1974年 | 60篇 |
1973年 | 56篇 |
1972年 | 50篇 |
1971年 | 53篇 |
1968年 | 49篇 |
1967年 | 60篇 |
1966年 | 43篇 |
排序方式: 共有5007条查询结果,搜索用时 15 毫秒
161.
Rev’d Ian StJohn Fisher Ph.D. 《Science and engineering ethics》1996,2(3):335-344
Religion, defined as ‘the idea of a state that transcends ourselves and our world and the working out of the consequences
of that idea’, may influence the ethical thinking of scientists and engineers in two ways. The first is at the level of the
individual and how personal beliefs affect the choice of research, design or development projects, relationships with other
researchers and the understandings of the consequences of research on other aspects of life. The second level is that of the
social and cultural setting in which scientists and engineers work; how society decides which research to sponsor, how to
apply the results of scientific discovery and which technology it chooses to develop and for what purposes. In neither of
these areas is religious belief a necessary condition for scientists and engineers to pursue one course of action rather than
another. The existence of religious belief within the individual and society is, though, part of the ethical framework in
which scientist and engineers work and therefore something to which attention should be paid. Religion provides a particular
perspective on what should be. Conversely science and technology provide information on the nature of the person and the universe
in which we live, which must be taken into account when theologians and religious moralists apply their ethical norms and
principles. 相似文献
162.
163.
164.
165.
166.
John O. Nelson 《The Journal of value inquiry》1978,12(4):292-295
167.
168.
A multiple-answer multiple-choice test item has a certain number of alternatives,any number of which might be keyed. The examinee is also allowed to mark any number of alternatives. This increased flexibility over the one keyed alternative case is useful in practice but raises questions about appropriate scoring rules. In this article a certain class of item scoring rules called thebinary class is considered. The concepts ofstandard scoring rules and equivalence among these scoring rules are introduced in the misinformation model for which the traditional knowledge model is a special case. The examinee's strategy with respect to a scoring rule is examined. The critical role of a quantity called the scoring ratio is emphasized. In the case of examinee uncertainty about the number of correct alternatives on an item, a Bayes and a minimax strategy for the examinee are developed. Also an appropriate response for the examiner to the minimax strategy is outlined.Research partially supported under Grants N00014-67-A-0314-0022 from the Office of Naval Research and GS-32514 and MPS 75-07539 from the National Science Foundation. 相似文献
169.
O Akin W Chase 《Journal of experimental psychology. Human perception and performance》1978,4(3):397-410
A mathematical model, based on additive subcomponents of grouping, subitizing and adding, was derived to account for quantification latencies of three-dimensional block arrangements. Subitizing is the process that people use to directly quantify a small number of objects without counting. It was found that most people consistently subitized up to four blocks. With more than four blocks, people resorted to grouping and adding, and the model was able to account for these data. The structural variables of compactness, symmetry, linearity, and planarity were shown to have small effects on quantification latencies relative to the large effect of number of blocks. Of these structural variables, compactness had the largest effect, and in terms of the model, it is suggested that visual structure had its effect on the perceptual grouping subcomponent. 相似文献
170.
O. J. Andy L. P. Giurintano S. L. Giurintano 《Integrative psychological & behavioral science》1978,13(1):1-12
A neurophysiologic model for aggessive behavior in the cat is proposed. Stimulus-bound and seizure-bound aggression was evaluated in relation to limbic and basal ganglia induced seizures (after-discharges). Electrically induced limbic and basal ganglia afterdischarges were used because they are known to implicate septohypothalamic sites from which aggression can be elicited by direct stimulation. The occurrence of behavioral aggression is correlated with the discharge characteristics of a single discharging system and with two interacting discharging systems. Aggression is composed of autonomic and somato-motor components which poses relatively low and high thresholds, respectively, for their activation. Aggression occurring during a combined septum and amygdala discharge was more intense and prolonged than with a septum discharge alone. Participation of a slow frequency discharging basal ganglia system activated seizurebound aggression in an otherwise nonaggressive limbic seizure. The limbic and basal ganglia stimulations and after-discharges lowered the excitability threshold of the aggression system and made it more vulnerable to being activated by external stimuli, such as visual and auditory stimuli. These observations are reminiscent of patients with aggressive behavior associated with psychomotor seizures. 相似文献