全文获取类型
收费全文 | 51057篇 |
免费 | 2004篇 |
国内免费 | 33篇 |
出版年
2020年 | 521篇 |
2019年 | 605篇 |
2018年 | 890篇 |
2017年 | 906篇 |
2016年 | 964篇 |
2015年 | 638篇 |
2014年 | 809篇 |
2013年 | 3903篇 |
2012年 | 1535篇 |
2011年 | 1571篇 |
2010年 | 954篇 |
2009年 | 994篇 |
2008年 | 1328篇 |
2007年 | 1351篇 |
2006年 | 1191篇 |
2005年 | 1072篇 |
2004年 | 1032篇 |
2003年 | 951篇 |
2002年 | 1020篇 |
2001年 | 1651篇 |
2000年 | 1665篇 |
1999年 | 1259篇 |
1998年 | 572篇 |
1997年 | 496篇 |
1993年 | 477篇 |
1992年 | 1022篇 |
1991年 | 934篇 |
1990年 | 949篇 |
1989年 | 894篇 |
1988年 | 864篇 |
1987年 | 840篇 |
1986年 | 846篇 |
1985年 | 905篇 |
1984年 | 735篇 |
1983年 | 665篇 |
1982年 | 522篇 |
1979年 | 804篇 |
1978年 | 582篇 |
1977年 | 535篇 |
1976年 | 521篇 |
1975年 | 671篇 |
1974年 | 761篇 |
1973年 | 771篇 |
1972年 | 683篇 |
1971年 | 598篇 |
1970年 | 540篇 |
1969年 | 631篇 |
1968年 | 742篇 |
1967年 | 662篇 |
1966年 | 646篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
San Diego suicide study: comparison of gay to straight males 总被引:1,自引:0,他引:1
Previous large studies of completed suicides have not considered sexual orientation in their data analyses. In this study, data from the known homosexual subpopulation (13 males, aged 21-42) in a series of 283 suicides were examined. They were compared with all other aged male suicides 21-42 (n = 106). Both groups showed considerable substance abuse plus a variety of other psychiatric diagnoses. Both also had a high frequency of relationship difficulties near the time of death. Gays who committed suicide did not have a history of more police trouble and were no more likely to be living alone than the comparison group. They did not have more prior suicide attempts or previous psychiatric treatment. We conclude that, among the factors examined here, there appears to be little difference between gay and heterosexual male suicides. 相似文献
992.
Younger adult students between 19 and 24 years of age (M = 21.3 years), older adult students between 61 and 76 years of age (M = 67.9 years), and older adult nonstudents between 62 and 76 years of age (M = 68.5 years) were assessed for health (self-ratings of physical and mental health), social functioning (self-ratings of physical and mental activity, perceived role activity level, perceived roles, locus of control, and age-norm expectations), and cognitive functioning (Wechsler Adult Intelligence Scale-Revised vocabulary and block design, and paired associate memory). Age differences were observed in self-ratings of health, social roles, intellectual performance, and memory. No student status differences were observed. The results are discussed in terms of plasticity of intellectual function and characteristics of student status in later adulthood. 相似文献
993.
Modest decrements in both taste threshold sensitivity and, more recently, suprathreshold sensitivity have been associated with the aging process. The present study was designed to investigate the existence of changes in preference for various concentrations of single tastes and of the same single tastes in more complex chemosensory mixtures. In this study, 300 participants from three different age groups (18-26, 32-45, over 65) rated for pleasantness four concentrations of sodium chloride, sucrose, and citric acid presented in both aqueous and beverage bases. Results showed significant effects of age, stimulus background, stimulus, concentration, and of several interactions, and they suggest that elderly subjects find salt and sugar pleasanter at higher concentrations than younger subjects do. 相似文献
994.
995.
Barbara E. DiCocco L.C.S.W. 《Contemporary Family Therapy》1986,8(1):50-61
When presented with a behavioral problem or symptom expression that involves two systems, such as a serious school-related problem, the therapist needs to design an approach that will intervene effectively and expeditiously in both systems. This paper offers a guide to stages of problem escalation and therapeutic intervention that is intended to aid the problem-solver's thinking processes in approaching a troubled situation that involves two systems, the school and the home. 相似文献
996.
997.
There has been interest in recent years in the relationship between marital distress and psychopathology. It has been rare, however, for investigators to follow patients after their release from the hospital and observe the course of their marital relationships. The present study included patients meeting criteria for three DSM III DISORDERS (MAjor depressive, bipolar, and schizophrenic) and a normal control sample, all of whom are participants in an ongoing longitudinal study of children at risk for psychopathology (Stony Brook High-Risk Project; Weintraub & Neale, 1984). Marital Adjustment Test (MAT; Locke & Wallace, 1959) scores were collected on patients at entry into the project (Phase I) and at a three year follow-up (Phase II). Course of marriage was defined as negative if the couple's marital adjustment was rated as poor at Phase II or resulted in divorce or separation at Phase II. It was found that only the depressed group differed from the normal group in having significantly worse course of marital relationship; 84% of the depressive couples showed a “negative” course of marital change over time. However, all three patient groups had significantly higher rates of divorce by Phase II. MAT scores at Phase I successfully predicted course of marital relationship for all diagnostic groups. Implications for aftercare of psychiatric inpatients are discussed. 相似文献
998.
Helge Sletvold Geirr Molde Jensen K. Gunnar Götestam M.D. Ph.D. 《Integrative psychological & behavioral science》1986,21(1):32-35
Forty normotensive subjects participated on a voluntary basis in a study designed to compare the effect of suggestions on blood pressure (BP). Two experimental groups received suggestions presumed to be specific in lowering or raising BP after simple relaxation (relaxation group) or hypnotic induction (hypnotic group). A control group was used to record the BP changes over time. The time variable was significant for both systolic (SBP) and diastolic blood pressure (DBP). Induction procedures (hypnosis or relaxation) resulted in significant decreases in DBP in both experimental groups. In the control group there was a significant decrease in SBP. A specific suggestion to increase the BP resulted only in DBP increase in the hypnotic group. This group also gave an increase of both SBP and DBP over the entire experiment, whereas the relaxation group resulted in a significant decrease in SBP. There was no significant group variable, indicating no differences between the groups. Further research is needed to enable firm conclusions of the effect of suggestions on BP. 相似文献
999.
Attention, Perception, & Psychophysics - Speech perception abilities are modified by linguistic experience to maximize sensitivity to acoustic contrasts that are important for one’s... 相似文献
1000.
Alternate monocular and binocular exposure to complementary stimulation can yield opposite but coexisting aftereffects that are contingent on whether the test display is viewed with one eye or two eyes. The motion aftereffect was studied by adapting each eye separately to a contracting spiral and both eyes together to an expanding spiral. The stationary test spiral subsequently appeared to be expanding when viewed monocularly, but to be contracting when it was seen with both eyes open. With respect to the McCollough effect, after monocular exposure to red-vertical and green-horizontal gratings and binocular exposure to red-horizontal and green-vertical gratings, the appearance of the color of the test gratings when viewed with one eye was different from that when viewed with both eyes. Opposite, coexisting aftereffects induced by complementary stimulation can be interpreted as evidence that there are unique binocular aspects to visual function. 相似文献