首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   52434篇
  免费   969篇
  国内免费   7篇
  53410篇
  2020年   614篇
  2019年   656篇
  2018年   870篇
  2017年   856篇
  2016年   1006篇
  2015年   740篇
  2014年   899篇
  2013年   4056篇
  2012年   1590篇
  2011年   1578篇
  2010年   1111篇
  2009年   1084篇
  2008年   1500篇
  2007年   1454篇
  2006年   1303篇
  2005年   1215篇
  2004年   1163篇
  2003年   1105篇
  2002年   1128篇
  2001年   1436篇
  2000年   1444篇
  1999年   1051篇
  1998年   579篇
  1997年   535篇
  1992年   902篇
  1991年   869篇
  1990年   881篇
  1989年   827篇
  1988年   781篇
  1987年   772篇
  1986年   767篇
  1985年   816篇
  1984年   733篇
  1983年   639篇
  1982年   517篇
  1981年   547篇
  1979年   727篇
  1978年   584篇
  1977年   493篇
  1976年   488篇
  1975年   644篇
  1974年   744篇
  1973年   749篇
  1972年   603篇
  1971年   593篇
  1970年   533篇
  1969年   563篇
  1968年   697篇
  1967年   662篇
  1966年   592篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
881.
The consequences of maternal postpartum depression for mothers and children were investigated in a 4 1/2-year follow-up study, which included 70 of 99 women who had participated in an earlier study of postpartum depression. Information about maternal adjustment and depression during the follow-up period and child adjustment at age 4 1/2 years was obtained. Women who had experienced a postpartum depression were predicted to be at increased risk for subsequent depression and poor adjustment of their child. Postpartum depression was directly related to subsequent depression but not child problems. Later depression was related to child problems at 4 1/2 years. We concluded that postpartum depression may increase risk for later maternal depression and in turn increases risk for child behavior problems. Intervening with women who have experienced a postpartum depression may reduce likelihood of future depressions and child behavior problems.  相似文献   
882.
883.
Hyperventilation (hv) is increasingly recognized as being significant in a number of psychological and medical conditions. The core of treatment for hv is breathing retraining, usually on an individual basis. This article describes a group therapy for breathing retraining for patients with hv-induced panic reactions. An analysis of group process suggests that such treatment is helpful in ways impossible for individual retraining and that further exploration of this modality is warranted.  相似文献   
884.
885.
This article alerts us to consider depression as a relatively frequent cause of impasse in the course of group psychotherapy. The authors recommend the combined use of antidepressant medication along with group psychotherapy when such depression is confirmed independently outside the group. Common obstacles and pitfalls preventing successful combined treatment are reviewed; the depressive logjam is differentiated from common resistance; and profiles of responders versus nonresponders are described. A rationale of the combined treatment, its results, and implications for group therapists are all delineated.  相似文献   
886.
On the semantic content of subcategorization frames   总被引:3,自引:1,他引:2  
This paper investigates relations between the meanings of verbs and the syntactic structures in which they appear. This investigation is motivated by the enigmas as to how children discover verb meanings. Well-known problems with unconstrained induction of word meanings from observation of world circumstances suggest that additional constraints or sources of information are required. If there exist strong and reliable parallels between the structural and semantic properties of verbs, then an additional source of information about verb meanings is reliably present in each verb's linguistic context. Five experiments are presented which investigate the following hypothesis regarding the scope of these relations: The closer any two verbs in their semantic structure, the greater the overlap should be in their licensed syntactic structures. To investigate this hypothesis, data of two kinds were collected from different groups of subjects: (a) One group of subjects was asked to judge the semantic relatedness of verbs by selecting the semantic outlier in triads presented to them. (b) A second group of subjects was asked to judge the grammaticality of these same verbs in a large range of syntactic environments. These two types of data were then compared to assess the degree of correspondence in the two partitionings (syntactic and semantic) of the verb set. The findings, overall, support the view that the syntax of verbs is a quite regular, although complex, projection from their semantics. In conclusion, we discuss the kinds of features that are formally marked in syntactic structure and relate these to the problem of verb-vocabulary acquisition in young children.  相似文献   
887.
888.
Fibrositis (fibromyalgia) patients were compared with normal controls in terms of electrophysiology (EEG), self-report indicants of awakening, quality of sleep, behaviourally signalled awakenings, and Symptom Check List 90R (SCL-90R) scores. The results differentiated fibrositis patients from normal controls in terms of SCL-90R scores, with fibrositis patients showing significantly more psychopathology. Fibrositis patients had more alpha EEG sleep and less REM and Stage 1 sleep. They were better able to recall their behaviourally signalled awakenings the following morning and reported qualitatively less satisfying sleep than the normal controls. The alpha EEG sleep anomaly may reflect a vigilant arousal state during nocturnal sleep and result in the daytime experience of unrefreshing sleep, psychologic distress, that re-enforces the perpetuation of the sleep-related symptoms.  相似文献   
889.
This study aimed to clarify how manifestations and acquisition relate to diagnostic categories of dental fear in a population of self-referred dental fear patients, since diagnostic criteria specifically related to dental fear have not been validated. DSM III-R diagnostic criteria for phobias were used to compare with four existing dental fear diagnostic categories, referred to as the Seattle system. Subjects were 208 persons with dental fear who were telephone interviewed, of whom a subsample of 155 responded to a mailed Dental Anxiety Scale (DAS), State-Trait Anxiety Inventory and a modified FSS-II Geer Fear Scale (GFS). Personal interviews and a Dental Beliefs Scale of perceived trust and social interaction with dentists were also used to evaluate a subsample of 80 patients selected by sex and high dental fear. Results showed that the majority of the 80 patients (66%), suffered from social embarrassment about their dental fear problem and their inability to do something about it. The largest cause of their fear (84%) was reported to be traumatic dental experiences, especially in childhood (70%). A minority of patients (16%) could not isolate traumatic experiences and had a history of general fearfulness or anxiety. Analysis of GFS data for the 155 subjects showed that fear of snakes and injuries were highest among women; heights and injections among men. Fear of blood was rarely reported. Spearman correlations between GFS individual items and DAS scores indicated functional independence between dental fear and common fears such as blood, injections and enclosures in most cases. Only in specific types of dental fear did these results support Rachman and Lopatka's contention that fears are thought to summate.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   
890.
One-hundred and ninety-two probands were selected on the basis of personality questionnaires as being cancer-prone (100) or CHD-prone (92). They were then randomly divided into a control and a treatment group, the latter receiving a special kind of behaviour therapy attempting to change the personality patterns in the direction of a healthier, more autonomous personality. Follow-up after 10 and 13 years disclosed significantly lower death rates in probands receiving prophylactic treatment than in controls. Of special interest was the degree of sclerosis in the fundus of the eye, rateds on a 3-point scale. This was significantly higher prior to therapy in the CHD-prone group than in the cancer-prone group. Treatment reduced the degree of sclerosis, particularly in the CHD group; lack of treatment was followed by an increase in sclerosis. Similar but less marked changes were found in the cancer-prone group. Clearly psychological treatment affects significantly bodily functions associated with CHD. Other risk factors considered were systolic and diastolic blood pressure, blood cholesterol and blood sugar, all of which, together with personality, influenced the degree of sclerosis observed.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号