全文获取类型
收费全文 | 11758篇 |
免费 | 254篇 |
国内免费 | 190篇 |
专业分类
12202篇 |
出版年
2015年 | 37篇 |
2013年 | 36篇 |
2012年 | 977篇 |
2011年 | 1154篇 |
2010年 | 278篇 |
2009年 | 134篇 |
2008年 | 924篇 |
2007年 | 918篇 |
2006年 | 811篇 |
2005年 | 723篇 |
2004年 | 616篇 |
2003年 | 611篇 |
2002年 | 542篇 |
2001年 | 350篇 |
2000年 | 502篇 |
1999年 | 214篇 |
1998年 | 74篇 |
1997年 | 51篇 |
1996年 | 73篇 |
1995年 | 40篇 |
1994年 | 77篇 |
1993年 | 116篇 |
1992年 | 99篇 |
1991年 | 105篇 |
1990年 | 96篇 |
1989年 | 99篇 |
1988年 | 114篇 |
1987年 | 127篇 |
1986年 | 89篇 |
1985年 | 120篇 |
1984年 | 121篇 |
1983年 | 139篇 |
1982年 | 95篇 |
1981年 | 92篇 |
1980年 | 79篇 |
1979年 | 87篇 |
1978年 | 75篇 |
1966年 | 48篇 |
1965年 | 133篇 |
1964年 | 105篇 |
1963年 | 126篇 |
1962年 | 54篇 |
1958年 | 145篇 |
1957年 | 116篇 |
1956年 | 89篇 |
1955年 | 58篇 |
1954年 | 49篇 |
1953年 | 54篇 |
1951年 | 41篇 |
1950年 | 37篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Emotional risk factors were examined in 129 litigant and nonlitigant patients diagnosed with Postconcussional Disorder (PCD) following Mild Traumatic Brain Injury (MTBI). According to Millon Clinical Multiaxial Inventory (MCMI) criteria, four subgroups emerged: (a) 14.7% met criteria for an Axis I disorder, (b) 24.8% for an Axis II disorder, (c) 24.0% for bout Axis I and II disorders, and (d) 36.4% fell below threshold for psychopathology. Thus, 63.5% endorsed emotional pathology. Of the four groups, those with both Axis I and II psychopathology presented the greatest number of emotional complaints in a clinical interview and manifested the lowest neurocognitive test scores. Motor skills, verbal abilities, memory functioning, and IQ were primarily affected. With the exception of post-morbid emotional complaints, no significant differences were identified between litigants and nonlitigants. Our analysis suggests that the combination of both Axis I and II psychopathology is associated with greater impairment following MTBI. 相似文献
992.
993.
994.
Generalized eta and omega squared statistics: measures of effect size for some common research designs 总被引:1,自引:0,他引:1
The editorial policies of several prominent educational and psychological journals require that researchers report some measure of effect size along with tests for statistical significance. In analysis of variance contexts, this requirement might be met by using eta squared or omega squared statistics. Current procedures for computing these measures of effect often do not consider the effect that design features of the study have on the size of these statistics. Because research-design features can have a large effect on the estimated proportion of explained variance, the use of partial eta or omega squared can be misleading. The present article provides formulas for computing generalized eta and omega squared statistics, which provide estimates of effect size that are comparable across a variety of research designs. 相似文献
995.
The safety and efficacy of medications for preventive treatment of migraine is the subject of current concern and investigation in health care. Two single-center, double-blind, placebo-controlled studies were conducted to evaluate the efficacy and safety of topiramate for migraine prophylaxis. Seventy patients with a diagnosis of migraine were randomly assigned to topiramate-treated and placebo groups. The studies consisted of a 4-week baseline phase, a 6-8 week titration, and 8-12 weeks of maintenance. Topiramate was titrated from an initial dose of 25 mg/day to a target dose of 100 mg BID. The primary efficacy measure, the mean 28-day migraine frequency, was lower in topiramate-treated patients than in the placebo group (3.2 versus 3.8, P=.001). Similarly, topiramate treatment resulted in a significantly greater mean reduction in migraine frequency than did placebo (1.55 versus 0.47, P=.001) and a significantly higher responder rate (35.3% versus 8.3%, P=.008). Paresthesia was the most common side effect reported with topiramate treatment. Other topiramate-associated adverse events included altered taste, memory impairment, diarrhea, and appetite suppression/weight loss. The rates of discontinuation were similar for the topiramate group (n=10) and the placebo group (n=8). These results suggest that topiramate is effective and well tolerated in the preventive treatment of migraine headaches. 相似文献
996.
Reflexology has been present throughout Spanish science since the last third of the nineteenth century and its importance can be seen in the works of authors such as Martín Salazar, Ramón y Cajal, Gómez Oca?a, Simarro and Turró. The most important research in Reflexology in Spain takes place a) at the Schools of Neurophysiology and Psychology in Barcelona and Madrid, b) with a group of authors specializing in pathological medicine and c) in the Military's Health Department, Pavlov's work was received in Spain with special interest. Fernández-Espa?a, who could be considered the "first Spanish Pavlovian," emphasized Pavlov's work in a series dedicated to the study of objective psychology which was published between 1914 and 1924. Planelles was the first investigator to develop a program in pavlovian experimentation, presenting his results in 1935. The Civil War (1936-1939) ended these and many other Spanish projects in psychology. After the war, interest in Reflexology and Pavlov's theories slowly rose again, first through psychosomatic medicine and then in the 60's because of the works of such authors as Monserrat-Esteve, Rof Carballo and Colodrón. The progressive inclusion of psychology in the Schools of Philosophy and Arts after 1968 marked the beginning of a new era. 相似文献
997.
998.
Sherrington J 《Science and engineering ethics》2003,9(3):419-423
This paper was presented at a seminar that outlined the work of the Surrey Ethics Forum. The Forum provides an opportunity for reflection by staff of the Federal University of Surrey and its Associated Institutions on ethical questions, the place of ethics in the curriculum and the role of ethics in the life of future graduates. The purpose of this paper is to argue that openness to the relationship between ethics and faith is itself an ethical task because both ethics and faith claim to protect human dignity and give meaning to the concept of "human flourishing". Analysis of the relationship between ethics, faith, flourishing and narrative can lead to clearer understanding of differences in ethical debates. 相似文献
999.
Braun J 《Trends in cognitive sciences》2003,7(1):7-9
The effortless ease of everyday vision seems to contradict numerous findings on the limited capacity of visual attention. However, natural scenes appear to escape the stringent limitations of attention that apply to seemingly far simpler stimuli. This astonishing result will oblige us to rethink the nature of visual attention and its limited capacity. 相似文献
1000.