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   3781篇
  免费   155篇
  国内免费   2篇
  2023年   19篇
  2022年   22篇
  2021年   32篇
  2020年   52篇
  2019年   78篇
  2018年   103篇
  2017年   105篇
  2016年   102篇
  2015年   89篇
  2014年   110篇
  2013年   423篇
  2012年   172篇
  2011年   184篇
  2010年   93篇
  2009年   126篇
  2008年   164篇
  2007年   191篇
  2006年   182篇
  2005年   136篇
  2004年   134篇
  2003年   115篇
  2002年   148篇
  2001年   68篇
  2000年   65篇
  1999年   55篇
  1998年   46篇
  1997年   61篇
  1996年   45篇
  1995年   48篇
  1994年   45篇
  1993年   40篇
  1992年   53篇
  1991年   26篇
  1990年   42篇
  1989年   35篇
  1988年   27篇
  1987年   24篇
  1986年   34篇
  1985年   36篇
  1984年   28篇
  1983年   34篇
  1982年   28篇
  1981年   35篇
  1980年   31篇
  1979年   24篇
  1978年   29篇
  1977年   30篇
  1975年   28篇
  1974年   23篇
  1973年   22篇
排序方式: 共有3938条查询结果,搜索用时 31 毫秒
881.
We develop and test a theoretical framework delineating the dual affective and motivational experiences arising from perceptions of being envied in the workplace. We theorize that being envied can be pleasantly or unpleasantly experienced with opposite downstream effects on motivation and job performance. We test our model in two field studies using a sample of government employees (Study 1) and a sample of employees in the financial industry (Study 2). Our results indicate that being envied can elicit unpleasant mood and anxiety that influence work engagement and job performance in negative ways. In addition, we found that positive emotional experiences from being envied bolster work engagement and performance through positive mood but not pride. Implications of our findings are discussed.  相似文献   
882.
Aurora Health Care in eastern Wisconsin has a clinical genetics program driven by genetic counselors in the cancer/adult and prenatal genetics settings. In 2015, the workforce shortage of genetic counselors left us with 4 open positions for genetic counselors that we were unable to fill. We explored many models of alternative service delivery, and determined virtual health (VH) via telemedicine to be the best option for our system. Historically, telemedicine technologies have been used to provide access to healthcare services to patients in remote areas. We, however, were struggling to find genetics counselors to staff both our remote clinics and urban clinics. To solve this problem, we recruited genetic counselors from across the country to work remotely from their current home or home office utilizing VH to staff our clinics. We then created clinical workflows and an implementation process of virtual health for 9 prenatal and cancer clinics across the eastern Wisconsin footprint of our healthcare system over the course of 12 months. Here we provide our experience and process in establishing a VH program in order to help other institutions that have been affected by the workforce shortage of clinical genetics professionals.  相似文献   
883.
884.
Previous research has suggested that infants exhibit a preference for familiar over unfamiliar social groups (e.g., preferring individuals from their own language group over individuals from a foreign language group). However, because past studies often employ forced‐choice procedures, it is not clear whether infants' intergroup preferences are driven by positivity toward members of familiar groups, negativity toward members of unfamiliar groups, or both. Across six experiments, we implemented a habituation procedure to independently measure infants' positive and negative evaluations of speakers of familiar and unfamiliar languages. We report that by 1 year of age, infants positively evaluate individuals who speak a familiar language, but do not negatively evaluate individuals who speak an unfamiliar language (Experiments 1 and 2). Several experiments rule out lower‐level explanations (Experiments 3–6). Together these data suggest that children's early social group preferences may be shaped by positive evaluations of familiar group(s), rather than negative evaluations of unfamiliar groups.  相似文献   
885.
886.
Some cognitive abilities exhibit reliable gender differences, with females outperforming males in specific aspects of verbal ability, and males showing an advantage on certain spatial tasks. Among these cognitive gender differences, differences in mental rotation are the most robust, and appear to be present even in infants. A large body of animal research suggests that gonadal hormones, particularly testosterone, during early development could contribute to this gender difference in mental rotation. Also, substantial evidence supports an influence of socialization on mental rotation performance. The present study investigated the relationship of two types of factors, early postnatal testosterone exposure and parental attitudes about gender, to mental rotation performance in 61 healthy infants (29 males, 32 females). We measured salivary testosterone at two time points: 1–2.5 months of age and 5–6 months of age. Infants’ mental rotation performance and parents’ attitudes about gender were assessed at 5–6 months of age. As predicted, testosterone concentrations were significantly higher in boys than girls in early infancy (d = 0.54), and boys performed significantly better than girls on mental rotation (d = 0.64). A significant positive correlation between testosterone at age 1–2.5 months and mental rotation was found only in boys (r = 0.50, p = .01). A significant negative correlation between parents’ gender‐stereotypical attitudes and mental rotation performance was found only in girls (r = ?.57, p = .002). These findings suggest that the early postnatal testosterone surge (also known as “mini‐puberty”) may have organizational influences on mental rotation performance in boys, and that parents may influence their daughters’ mental rotation abilities beginning very early in life.  相似文献   
887.
Spirituality measures often show positive associations with preferred mental health outcomes in the general population; however, research among American Indians (AIs) is limited. We examined the relationships of mental health status and two measures of spirituality – the Midlife Development Inventory (MIDI) and a tribal cultural spirituality measure – in Northern Plains AIs, aged 15–54 (n?=?1636). While the MIDI was unassociated with mental health status, the tribal cultural spirituality measure showed a significant relationship with better mental health status. Mental health conditions disproportionately affect AIs. Understanding protective factors such as cultural spirituality that can mitigate mental health disorders is critical to reducing these health disparities.  相似文献   
888.
Object decision (OD) test is one subtest of the Birmingham Object Recognition Battery (BORB). It is useful for differential diagnosis among several neurodegenerative diseases. However, normative data provided with this battery count on very few subjects and do not control for the effect of age, which limits interpretability. The purpose of Study 1 was to provide normative data for the OD test of the BORB (version A—hard). The objectives of Study 2 were to establish the diagnostic validity of this task and predictive validity of the normative data in the case of the semantic variant of primary progressive aphasia (svPPA) and Alzheimer’s disease (AD).Based on multiple linear regressions, equations to calculate Z-scores corrected for age were provided for 130 participants aged from 47 to 89 years. Performance of 20 healthy participants was compared to that of 14 individuals with svPPA and 18 with AD. After controlling for confounders, participants with svPPA had a lower total score than controls and AD participants. AD participants had a poorer performance than controls only when chimeric objects were considered. Among those with a deficit on the total score of the test, 94% (17/18, including 12 with svPPA) were correctly identified as having a pathological condition (svPPA or AD). This test could help refine differential diagnosis between svPPA and AD patients, especially before the deficits of episodic memory show up.  相似文献   
889.
Older adults have difficulty recalling specific autobiographical events. This over-general memory style is a vulnerability factor for depression. Two groups receiving interventions that have previously been successful at reducing over-general memory in depressed populations were compared to a control group. Participants were healthy older adults aged ≥70 years: memory specificity training (MEST; = 22), life review (= 22), and control group (= 22). There were significant improvements in autobiographical memory specificity in the MEST and life review groups at post-training, relative to the control group, suggesting that over-general memory can be reduced in older adults. Change in social problem solving ability and functional limitations were related to change in autobiographical memory specificity, supporting the suggested role of specific retrieval in generating solutions to social problems and maintaining independence. Qualitative analysis of participants’ feedback revealed that life review may be more appropriate for older adults, possibly because it involves integrating specific memories into a positive narrative.  相似文献   
890.
The hippocampus is closely tied to spatial navigation, a central component in cognitive functioning, and critically involved in age-associated cognitive decline and dementia. This study evaluated a novel, cognitive computerized spatial navigation training (CSNT) program targeting the hippocampus, with expectation of mitigating possible cognitive decline with bed rest (BR). During a 14-day BR study with 16 healthy, older men (mean age = 60 ± 3, range = 55–65 years), half received CSNT for 12 days in 50-min sessions and half were controls (watching documentaries). This design uniquely controlled diet, sleep, and other personal and environmental activities. Although there were no cognitive declines in controls post-BR, CSNT participants demonstrated significant increases in executive/attention ability and processing speed, and continued spatial navigation testing showed improvement to 400 days post-BR. This intervention may prove useful to mitigate cognitive declines known to occur in long periods of immobilization and could have broader implications in protecting against age-related cognitive decline.  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