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   7758篇
  免费   315篇
  国内免费   3篇
  2023年   48篇
  2021年   64篇
  2020年   129篇
  2019年   155篇
  2018年   187篇
  2017年   209篇
  2016年   209篇
  2015年   165篇
  2014年   202篇
  2013年   938篇
  2012年   327篇
  2011年   321篇
  2010年   198篇
  2009年   231篇
  2008年   318篇
  2007年   300篇
  2006年   273篇
  2005年   283篇
  2004年   261篇
  2003年   245篇
  2002年   246篇
  2001年   116篇
  2000年   104篇
  1999年   114篇
  1998年   127篇
  1997年   86篇
  1996年   88篇
  1995年   98篇
  1994年   82篇
  1993年   73篇
  1992年   76篇
  1991年   81篇
  1990年   61篇
  1989年   73篇
  1988年   69篇
  1987年   57篇
  1986年   57篇
  1985年   78篇
  1984年   82篇
  1983年   72篇
  1982年   63篇
  1981年   68篇
  1980年   66篇
  1979年   47篇
  1978年   68篇
  1977年   61篇
  1976年   64篇
  1975年   61篇
  1974年   57篇
  1973年   46篇
排序方式: 共有8076条查询结果,搜索用时 421 毫秒
921.
BACKGROUND: Depression and suicidality are frequently reported in patients with psychosis and schizophrenia, but the grief process that may be associated with this illness has not been systematically studied. In this study, we examined whether patients diagnosed with psychosis identify, grieve, and mourn losses engendered by the illness. METHOD: 24 patients diagnosed with psychosis in the past five years were surveyed to indicate whether their illness led to losses, and to describe their responses to the losses. Psychosis-related perceived losses were surveyed using three subscales of a loss and grief questionnaire (loss of self, self-care, and roles). Their relationship with beliefs about the illness, symptomatology, coping style, and self-efficacy and insight was studied. RESULTS: 23 (96%) patients named specific losses, and 16 patients (67%) reported feelings associated with grief and mourning. More than half reported loss of self-esteem at the onset of illness and only half saw themselves as having improved in the past month. Patients reported more loss within the past month than at the onset of illness. In the past month, patients with an intact sense of self experienced greater self-efficacy (r = .568, p < .004) while those with loss of self reported feelings of shame (r = ?.582, p < .003). Only patients with insight associated the onset of illness with loss. In the past month, most patients saw themselves as experiencing loss. DISCUSSION: The study results suggest that at some distance from diagnosis, patients still experience themselves as having much loss due to their illness. These unresolved feelings may indicate complicated mourning. Insight appears to be associated with the ability to look back at the onset of the illness and recognize that it engendered losses. Further study of the process of and barriers to grief and mourning is recommended. In clinical practice, the assessment of grief as a part of post-psychotic recovery could lead to providing more appropriate treatment and lead to a positive outcome.  相似文献   
922.
Abstract

Anxiety's role in AIDS risk reduction is discussed. We argue that behavioral techniques will be critical tools for alerting people to the threat of AIDS and their own vulnerability. Informational models have not been found to be sufficient for convincing people of the extent of the threat of AIDS to them. We suggest that techniques aimed at raising people's anxiety over their vulnerability will be necessary to raise their motivation to attend to AIDS messages, and we present techniques aimed at increasing anxiety over vulnerability. Following acknowledgment of vulnerability, people will need to adopt or continue safer sex practices that are viewed as undesirable in contrast to unsafe sex practices that are viewed as less costly and less anxiety provoking. Given a clearer practical and theoretical understanding of the anxiety-producing costs of adopting safer sex behaviors, we present methods for reducing this anxiety. We also discuss the necessity for considering ethnic, minority, and other cultural nuances in social and sexual anxiety and how these might be addressed in efforts to increase safer sex practices.  相似文献   
923.
Abstract

The primary purpose of the present study was to examine cognitive reactions of high and low test-anxious subjects while performing a task of extreme difficulty. A sample of 44 subjects (28 females, 16 males) attempted a difficult analogies task and then reported their thoughts during the task. Subjects also completed the Sarason Test Anxiety Scale and several other self-report measures of their cognitive reactions to the task. Thought listings were classified according to their referent (self, task, or unrelated) and their valence (positive, negative, or neutral). Correlational analyses were then performed with the various measures and revealed an association between test anxiety and reports of negative thoughts involving the self. Test anxiety was not related significantly to the number of thoughts involving the task nor to actual performance on the task. However, test-anxious subjects did report more negative expectancies for their performance and greater cognitive interference during the task. Negative self-expectancies were also related to more negative self thoughts, fewer positive self thoughts, and fewer positive task-related thoughts. The results are interpreted as further evidence for both the role of negative self-related cognitions in the experience of test anxiety and the usefulness of unstructured measures in anxiety research.  相似文献   
924.
Abstract

Recent research indicates that some dimensions of perfectionism are positively related to athlete burnout, whereas others are negatively related to athlete burnout. The divergent relationship between these dimensions of perfectionism and athlete burnout may be explained by different coping tendencies. The present investigation examined whether different coping tendencies mediate the relationship between self-oriented and socially prescribed perfectionism and burnout. Two-hundred and six junior elite athletes (M age=15.15 years, SD=1.88 years, range=11–22 years) completed measures of self-oriented and socially prescribed perfectionism, coping tendencies, and athlete burnout. Structural equation modeling indicated that the relationship between dimensions of perfectionism and athlete burnout was mediated by different coping tendencies. Higher levels of socially prescribed perfectionism was related to higher levels of avoidant coping which, in turn, was related to higher levels of athlete burnout. In contrast, higher levels of self-oriented perfectionism was related to higher levels of problem-focused coping and lower levels of avoidant coping which, in turn, was related to lower levels of athlete burnout. The findings suggest that different coping tendencies may underpin the divergent relationship between self-oriented and socially prescribed dimensions of perfectionism and athlete burnout.  相似文献   
925.
ABSTRACT

The evaluation of visitor flow within a museum or exhibition has been a topic of interest for decades with several research approaches taken over the years. Direct observation or visitor tracking during museum occupancy is the most popular technique, but it generally requires substantial amounts of time and financial resources. An alternative approach to direct observation—visitor self-mapping—is presented using data obtained from 2 short-term, small-budget evaluations of a world-class collection museum. Results show that self-mapping provides usable data with more than 90% of maps having tracking data for the entire museum. Maps varied in the amount of detail, but more than 60% of visitors provided details beyond what was required. In Study 1, movement patterns, sweep rate indices, and timing data suggest that the mapping data accurately reflected the visitor experience. Study 2 directly paired the self-mapping method used in Study 1 with unobtrusive behavioral observations to address the reliability and validity of the new approach. A discussion compares the relative costs and benefits of the new approach with more conventional direct observation techniques and provides directions for future research.  相似文献   
926.
We compared visual priming and comparison tasks to assess information processing of a stimulus during the first 2 s after its onset. In both tasks, a 13-ms prime was followed at varying SOAs by a 40-ms probe. In the priming task, observers identified the probe as rapidly and accurately as possible; in the comparison task, observers determined as rapidly and accurately as possible whether or not the probe and prime were identical. Priming effects attained a maximum at an SOA of 133 ms and then declined monotonically to zero by 700 ms, indicating reliance on relatively brief visuosensory (iconic) memory. In contrast, the comparison effects yielded a multiphasic function, showing a maximum at 0 ms followed by a minimum at 133 ms, followed in turn by a maximum at 240 ms and another minimum at 720 ms, and finally a third maximum at 1,200 ms before declining thereafter. The results indicate three stages of prime processing that we take to correspond to iconic visible persistence, iconic informational persistence, and visual working memory, with the first two used in the priming task and all three in the comparison task. These stages are related to stages presumed to underlie stimulus processing in other tasks, such as those giving rise to the attentional blink.  相似文献   
927.
MTV’s hit programs 16 and Pregnant and Teen Mom have been the subject of national debate since their inception. Supporters contend that the shows inhibit pregnancy-risk behavior. Critics contend that the shows glamorize adolescent motherhood and encourage pregnancy-risk behavior. The present study explored the possibility that the association between viewing 16 and Pregnant and Teen Mom and student females’ pregnancy-risk behavior depends on the extent to which females’ parents communicated with them about sex while they were growing up. Survey data were gathered from 313 female students. A disordinal interaction was found between father–daughter sexual communication, viewing frequency, and recent intercourse behavior. Frequent viewing was associated with an increased probability of having engaged in recent intercourse for females whose fathers did not communicate with them about sex while growing up. Conversely, frequent viewing was associated with a decreased probability of having engaged in recent intercourse for females whose fathers often communicated about sex with them while growing up. No interaction was found between mother–daughter sexual communication, viewing frequency, and recent intercourse behavior. These results suggest that fathers may play an especially important role in determining how sexual media socialize their daughters.  相似文献   
928.
Paul Gould 《Axiomathes》2013,23(2):343-364
Attempts to explicate the substance-property nexus are legion in the philosophical literature both historical and contemporary. In this paper, I shall attempt to impose some structure into the discussion by exploring ways to combine two unlikely bedfellows—Platonic properties and Aristotelian substances. Special attention is paid to the logical structure of substances and the metaphysics of property exemplification. I shall argue that an Aristotelian-Platonic account of the substance-property nexus is possible and has been ably defended by contemporary philosophers.  相似文献   
929.
Despite the complexity and diversity of natural scenes, humans are very fast and accurate at identifying basic-level scene categories. In this paper we develop a new technique (based on Bubbles, Gosselin & Schyns, 2001a; Schyns, Bonnar, & Gosselin, 2002) to determine some of the information requirements of basic-level scene categorizations. Using 2400 scenes from an established scene database (Oliva & Torralba, 2001), the algorithm randomly samples the Fourier coefficients of the phase spectrum. Sampled Fourier coefficients retain their original phase while the phase of nonsampled coefficients is replaced with that of white noise. Observers categorized the stimuli into 8 basic-level categories. The location of the sampled Fourier coefficients leading to correct categorizations was recorded per trial. Statistical analyses revealed the major scales and orientations of the phase spectrum that observers used to distinguish scene categories.  相似文献   
930.
Recent evidence suggests that spatial frequency (SF) processing of simple and complex visual patterns is flexible. The use of spatial scale in scene perception seems to be influenced by people's expectations. However as yet there is no direct evidence for top-down attentional effects on flexible scale use in scene perception. In two experiments we provide such evidence. We presented participants with low- and high-pass SF filtered scenes and cued their attention to the relevant scale. In Experiment 1 we subsequently presented them with hybrid scenes (both low- and high-pass scenes present). We observed that participants reported detecting the cued component of hybrids. To explore if this might be due to decision biases, in Experiment 2, we replaced hybrids with images containing meaningful scenes at uncued SFs and noise at the cued SFs (invalid cueing). We found that participants performed poorly on invalid cueing trials. These findings are consistent with top-down attentional modulation of early spatial frequency processing in scene perception.  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