全文获取类型
收费全文 | 196334篇 |
免费 | 8510篇 |
国内免费 | 156篇 |
专业分类
205000篇 |
出版年
2020年 | 2792篇 |
2019年 | 3452篇 |
2018年 | 3882篇 |
2017年 | 4257篇 |
2016年 | 4853篇 |
2015年 | 3942篇 |
2014年 | 4805篇 |
2013年 | 23452篇 |
2012年 | 5471篇 |
2011年 | 4892篇 |
2010年 | 4270篇 |
2009年 | 4974篇 |
2008年 | 4858篇 |
2007年 | 4450篇 |
2006年 | 4823篇 |
2005年 | 4678篇 |
2004年 | 4231篇 |
2003年 | 3787篇 |
2002年 | 3615篇 |
2001年 | 4465篇 |
2000年 | 4189篇 |
1999年 | 3825篇 |
1998年 | 2944篇 |
1997年 | 2729篇 |
1996年 | 2652篇 |
1995年 | 2482篇 |
1994年 | 2446篇 |
1993年 | 2401篇 |
1992年 | 3153篇 |
1991年 | 2952篇 |
1990年 | 2816篇 |
1989年 | 2727篇 |
1988年 | 2688篇 |
1987年 | 2648篇 |
1986年 | 2651篇 |
1985年 | 2913篇 |
1984年 | 2818篇 |
1983年 | 2563篇 |
1982年 | 2467篇 |
1981年 | 2425篇 |
1980年 | 2272篇 |
1979年 | 2582篇 |
1978年 | 2371篇 |
1977年 | 2293篇 |
1976年 | 2127篇 |
1975年 | 2272篇 |
1974年 | 2400篇 |
1973年 | 2343篇 |
1972年 | 1882篇 |
1971年 | 1792篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
911.
The purpose of the present study was to investigate differences in demoralization between those who live in single-person households and those who live in households with others in a random sample of 8,634 urban adults. Responses to the 26-item Psychiatric Epidemiologic Research Interview did not substantiate that adults who live alone are more likely to be demoralized than those who live with others, until age and gender are considered. Men who live alone scored higher on demoralization than men who live with others, yet women who live with others scored higher on demoralization than those who live alone. An interaction for living arrangement and age group on demoralization was also observed. 相似文献
912.
M N Mc Leod 《The Psychoanalytic quarterly》1992,61(1):37-64
Freud revised his theory of dreams significantly. First, he discovered the role of the id in dreaming. He hypothesized that the function of dreaming is to gratify an infantile sexual wish, in accordance with the pleasure principle, and thereby to preserve sleep. However, he learned later that anxiety generated by recent events plays a greater role in stimulating dream formation than he had thought and that some dreams actually generate anxiety. These clinical observations caused him, in large part, to revise his theories of dreaming, of anxiety, and of the mental apparatus. 相似文献
913.
M R Spoont 《Psychological bulletin》1992,112(2):330-350
Investigation of the role of 5-hydroxytryptophan (5-HT), which functions as a modulator in the central nervous system, across behavioral contexts suggests that a general principle of transmitter function may be derived that is independent of specific behaviors and specific neural loci. A functional principle of 5-HT action in neural information processing in the central nervous system is proposed. Extremes deviations in 5-HT activity result in biases in information processing that may have direct effects on behavior. Such biases may predispose to pathological conditions such as violent suicide and aggression. 相似文献
914.
It has become increasingly accepted that pain is not simply a sensation generated by nociceptors, but a perceptual phenomenon with particular emotional qualities. The purpose of this article is to bring together vastly different streams of research on the divisibility of pain into sensory and affective components. Empirical evidence for this divisibility is drawn from recent studies using multivariate statistics, signal detection theory, and unidimensional scaling. An important conclusion is that separable though pain components may be, they are not necessarily independent. In critiquing previous research, new criteria are derived for partitioning pain into sensory and affective components. Finally, speculations are offered as to how these same components might be synthesized on the basis of theories of perceptual organization. 相似文献
915.
This review summarizes research concerning the relation between paternal factors and child and adolescent psychopathology. When compared with mothers, fathers continue to be dramatically underrepresented in developmental research on psychopathology. However, findings from studies of children of clinically referred fathers and nonreferred samples of children and their fathers indicate that there is substantial association between paternal characteristics and child and adolescent psychopathology. Findings from studies of fathers of clinically referred children are stronger for fathers' effects on children's externalizing than internalizing problems. In most cases the degree of risk associated with paternal psychopathology is comparable to that associated with maternal psychopathology. Evidence indicates that the presence of paternal psychopathology is a sufficient but not necessary condition for child or adolescent psychopathology. 相似文献
916.
917.
In this paper we study the acquisition of German noun plurals in relation to the question of how children represent regular and irregular inflection. Pinker and Prince (1992) have demonstrated several dissociations between regular and irregular inflection in the English past tense system. However, in English, the default status of -ed is confounded with its high frequency; therefore inflectional systems other than English past tense formation must be examined. The noun plural system in German is particularly interesting, because most nouns have irregular plurals in German and the regular (default) plural is less frequent than several of the irregular plurals. Thus it is unclear how a language learner determines whether German even has a regular plural, and if so what form it takes. Based on longitudinal data from impaired and unimpaired monolingual German-speaking children, we find a striking, statistically significant correlation: plural affixes that are used in overregularizations, namely -n or -s, are left out within compounds. This correlation shows that even impaired children are sensitive to the distinction between regular and irregular morphology. We propose a linguistic analysis of the correlation in terms of Kiparsky's (1982, 1985) level-ordering model plus an additional ordering condition on affixes: default (regular) affixes cannot serve as input to compounding processes. 相似文献
918.
In this paper we address the question how in language production conceptual structures are mapped onto lexical items. First we describe the lexical system in a fairly abstract way. Such a system consists of, among other things, a fixed set of basic lexical entries characterized by four groups of information: phonetic form, grammatical features, argument structure, and semantic form. A crucial assumption of the paper is that the meaning in a lexical entry has a complex internal structure composed of more primitive elements (decomposition). Some aspects of argument structure and semantic form and their interaction are discussed with respect to the issue of synonymy. We propose two different mappings involved in lexical access. One maps conceptual structures to semantic forms, and the other maps semantic forms to conceptual structures. Both mappings are context dependent and are many-to-many mappings. We present an elaboration of Levelt's (1989) model in which these processes interact with the grammatical encoder and the mental lexicon. Then we address the consequences of decomposition for processing models, especially the nature of the input of lexical access and the time course. Processing models that use the activation metaphor may have difficulties accounting for certain phenomena where a certain lemma triggers not one, but two or more word forms that have to be produced with other word forms in between. 相似文献
919.
The need for efficient and practical assessment techniques of the multidimensional nature of chronic pain remains paramount in clinical settings. Visual analogue scales (VASs) and simple behavioral observation methods have been proposed as efficient, reliable, and valid measures of the subjective (sensory and affective) and overt behavioral aspects of the pain experience. The relationships among VASs and the UAB Pain Behavior Scale were examined among 48 chronic pain patients. Ratings of overt behavior were significantly related to both the VAS sensory and VAS affective ratings. Regression analysis indicated that the VAS scores accounted for significant amount of the variance (27.7%) in UAB scores. Moreover, the affective dimension of self-reported pain tended to be more strongly related to the visible manifestations of pain than were ratings of pain intensity. 相似文献
920.
Recent studies, mostly performed on bulimic outpatients, did not find consistent predictors of treatment outcome in bulimia nervosa. This is the first study to investigate anamnestic and clinical factors predictive of the short-term outcome of hospital treatment in 31 female bulimia nervosa patients with a mean age of 22.9 yr. Treatment outcome was assessed by several self-rating instruments measuring different features of the specific and unspecific psychopathology of bulimia nervosa. The most relevant predictors of the outcome of the 8-week hospital treatment were duration of previous inpatient treatments for bulimia, the intensity of anorexic tendency and the pretreatment level of depression. The majority of predictors tested did not show a strong relationship to treatment outcome. The findings are discussed in relation to results of other studies as well as to possible implications for treatment and research. 相似文献