全文获取类型
收费全文 | 60801篇 |
免费 | 2437篇 |
国内免费 | 18篇 |
专业分类
63256篇 |
出版年
2020年 | 574篇 |
2019年 | 770篇 |
2018年 | 1020篇 |
2017年 | 1056篇 |
2016年 | 1102篇 |
2015年 | 807篇 |
2014年 | 959篇 |
2013年 | 4485篇 |
2012年 | 1789篇 |
2011年 | 1966篇 |
2010年 | 1228篇 |
2009年 | 1201篇 |
2008年 | 1736篇 |
2007年 | 1757篇 |
2006年 | 1605篇 |
2005年 | 1408篇 |
2004年 | 1320篇 |
2003年 | 1248篇 |
2002年 | 1354篇 |
2001年 | 1982篇 |
2000年 | 1967篇 |
1999年 | 1493篇 |
1998年 | 710篇 |
1997年 | 629篇 |
1996年 | 631篇 |
1993年 | 574篇 |
1992年 | 1256篇 |
1991年 | 1160篇 |
1990年 | 1138篇 |
1989年 | 1049篇 |
1988年 | 1026篇 |
1987年 | 979篇 |
1986年 | 1059篇 |
1985年 | 1068篇 |
1984年 | 896篇 |
1983年 | 826篇 |
1982年 | 579篇 |
1981年 | 588篇 |
1979年 | 954篇 |
1978年 | 681篇 |
1975年 | 774篇 |
1974年 | 820篇 |
1973年 | 916篇 |
1972年 | 766篇 |
1971年 | 725篇 |
1970年 | 644篇 |
1969年 | 670篇 |
1968年 | 860篇 |
1967年 | 777篇 |
1966年 | 653篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
82.
Noelle Yuen Naleen Andrade Linda Nahulu George Makini John F. McDermott George Danko Ronald Johnson Jane Waldron 《Suicide & life-threatening behavior》1996,26(1):27-36
Native Hawaiian high school students, N = 1779, were surveyed for symptoms of psycho-pathology and suicide attempts in the previous 6 months. Seventy-seven (4.3%) of the students reported making a suicide attempt. There were no significant differences in prevalence rates for males and females. Depression, anxiety, aggression, substance abuse symptoms, and low family support, but not peer support, were significantly correlated with suicide attempts. On logistic regression, depression, substance abuse, and family support independently predicted attempts. The lack of gender difference may indicate a cultural characteristic of the Hawaiian population that differentiates it from mainstream American populations but likens it to the Native American population. 相似文献
83.
84.
A theoretical structure for multiattribute decision making is presented, based on a dynamical system for interactions in a neural network incorporating affective and rational variables. This enables modeling of problems that elude two prevailing economic decision theories: subjective expected utility theory and prospect theory. The network is unlike some that fit economic data by choosing optimal weights or coefficients within a predetermined mathematical framework. Rather, the framework itself is based on principles used elsewhere to model many other cognitive and behavioral data, in a manner approximating how humans perform behavioral functions. Different, interconnected modules within the network encode (a) attributes of objects among which choices are made, (b) object categories, (c) and goals of the decision maker. An example is utilized to simulate the actual consumer choice between old and new versions of Coca-Cola. Potential applications are also discussed to market decisions involving negotiations between participants, such as international petroleum traders. 相似文献
85.
86.
Matthew J. Traxler Michael D. Bybee Martin J. Pickering 《The Quarterly Journal of Experimental Psychology Section A: Human Experimental Psychology》1997,50(3):481-497
An eye-tracking experiment investigated whether incremental interpretation applies to interclausal relationships. According to Millis and Just's (1994) delayed-integration hypothesis, interclausal relationships are not computed until the end of the second clause, because the processor needs to have two full propositions before integration can occur. We investigated the processing of causal and diagnostic sentences (Sweetser, 1990; Tversky & Kahneman, 1982) that contained the connective because . Previous research (Traxler, Sanford, Aked, & Moxey, 1997) has demonstrated that readers have greater difficulty processing diagnostic sentences than causal sentences. Our results indicated that difficulty processing diagnostic sentences occurred well before the end of the second clause. Thus comprehenders appear to compute interclausal relationships incrementally. 相似文献
87.
88.
89.
90.