全文获取类型
收费全文 | 5122篇 |
免费 | 1469篇 |
出版年
2023年 | 9篇 |
2022年 | 10篇 |
2021年 | 96篇 |
2020年 | 110篇 |
2019年 | 424篇 |
2018年 | 323篇 |
2017年 | 437篇 |
2016年 | 419篇 |
2015年 | 396篇 |
2014年 | 346篇 |
2013年 | 711篇 |
2012年 | 340篇 |
2011年 | 283篇 |
2010年 | 305篇 |
2009年 | 270篇 |
2008年 | 276篇 |
2007年 | 189篇 |
2006年 | 173篇 |
2005年 | 191篇 |
2004年 | 171篇 |
2003年 | 173篇 |
2002年 | 179篇 |
2001年 | 112篇 |
2000年 | 91篇 |
1999年 | 66篇 |
1998年 | 41篇 |
1997年 | 48篇 |
1996年 | 25篇 |
1995年 | 17篇 |
1994年 | 31篇 |
1993年 | 34篇 |
1992年 | 15篇 |
1991年 | 17篇 |
1990年 | 17篇 |
1989年 | 18篇 |
1988年 | 12篇 |
1987年 | 16篇 |
1986年 | 21篇 |
1985年 | 24篇 |
1984年 | 21篇 |
1983年 | 19篇 |
1982年 | 12篇 |
1981年 | 16篇 |
1980年 | 20篇 |
1979年 | 7篇 |
1978年 | 9篇 |
1977年 | 12篇 |
1976年 | 6篇 |
1975年 | 5篇 |
1950年 | 5篇 |
排序方式: 共有6591条查询结果,搜索用时 15 毫秒
251.
Consumers often encounter goods and services that provide cues to mark their progress. We define the term “goal progress cues” to reflect the diverse category of cues that highlight progress towards a goal. Across a series of three studies, we show that entity theorists, who rely on cues that highlight completion in order to signal their abilities to others, evaluate tasks that include these cues more favorably than those that lack these features. In contrast, incremental theorists, who focus on improving competence, are impacted only by progress cues that highlight learning. We demonstrate these findings across a variety of goal pursuit contexts that represent a mix of customer-centric (retail queues), service-oriented managerial (sales calls), and personal achievement consumer product (mazes) domains using both behavioral and self-reported measures. We conclude with a discussion about the theoretical and substantive implications of our findings. 相似文献
252.
Vanessa B. Sheppard Kristi D. Graves Juleen Christopher Alejandra Hurtado-de-Mendoza Costellia Talley Karen Patricia Williams 《Journal of genetic counseling》2014,23(3):311-322
Genetic counseling and testing for hereditary breast cancer have the potential benefit of early detection and early interventions in African American women. However, African American women have low use of these services compared to White women. We conducted two focus groups with African American women diagnosed with breast cancer (affected group, n?=?13) and women with at least one first-degree relative with breast/ovarian cancer (unaffected group, n?=?8). A content analysis approach was employed to analyze interview data. Breast cancer survivors had more knowledge about genetic counseling and testing than participants who were unaffected with cancer. However, knowledge about genetic counseling was limited in both groups. Barriers to pursuing genetic counseling and testing included poor understanding of the genetic counseling and testing process, fear of carrying the mutation, concerns about discrimination, and cost. Motivators to participate in genetic counseling and testing included desire to help family members, insurance coverage, and potential of benefiting the larger African American community. Education efforts are needed to increase genetic counseling and testing awareness in the African American community. 相似文献
253.
Lisa M. Pastore Logan B. Karns Karen Ventura Myra L. Clark Richard H. Steeves Nancy Callanan 《Journal of genetic counseling》2014,23(1):97-107
About 10 % of infertile/subfertile women are diagnosed with diminished ovarian reserve (DOR), of which?<?5 % will become pregnant spontaneously. Fragile X (FMR1) genetic testing may provide a reason for her early ovarian aging and/or have reproductive implications. Seven women with DOR (genetic study subset) and the male partners of six of these women were separately interviewed about the experience of being asked to undergo this unanticipated genetic test. Three interviews were conducted (before, within 1 week after, and 3 months after learning the test results). None of the participants carried the FMR1 premutation (largest FMR1 allele 27–50 CGG repeats). For women, their pregnancy-seeking journey was long and exhausting. Women understood the reproductive implications of carrying the FMR1 premutation, and hoped for a negative result. Being offered a genetic test caused women to pause and re-think their future reproductive plans. Husbands viewed the infertility journey as filled with unknowns, of which the genetic test results would be one more puzzle piece. The expense of fertility testing/treatment was mentioned by both spouses, though more notably by husbands. The introduction of a possible genetic cause of infertility, with additional potential health consequences for future biological children, caused women to re-think their quest for pregnancy. In contrast, the genetic test was viewed as an additional source of information for their husbands as opposed to raising concern regarding potential reproductive ramifications. 相似文献
254.
The present study investigated the properties of episodic spatial memory by conducting contextual analysis on spatial memory tasks in a large sample of individuals (N = 778) between the ages of 18 and 92. The results suggest that episodic spatial memory as measured by a dot location task is not uniquely influenced by memory but is strongly influenced by fluid ability (Gf). The spatial memory–Gf relationship is evident and robust even when spatial memory is operationalized with a very simple single-dot location task, suggesting that allocation of attention across space may play a role in the relationship. Results also indicate that the spatial memory–Gf relations are not dependent on complexity of processing, because Gf has a similar magnitude of relations with a more complex version of the dot location task. Collectively, the results suggest that spatial memory likely represents some aspect of fluid intelligence and is not uniquely related to measures of verbal memory. 相似文献
255.
The present study reveals that Election Day differentially affects the color preferences of US Republicans and Democrats. Voters’ preferences for Republican red and Democratic blue were assessed, along with several distractor colors, on and around the 2010 interim and 2012 presidential elections. On non-Election Days, Republicans and Democrats preferred Republican red equally, and Republicans actually preferred Democratic blue more than Democrats did. On Election Day, however, Republicans’ and Democrats’ color preferences changed to become more closely aligned with their own party’s colors. Republicans liked Republican red more than Democrats did, and no longer preferred Democratic blue more than Democrats did. These results are consistent with the hypothesis that color preferences are determined by people’s preferences for correspondingly colored objects/entities (Palmer & Schloss in Proceedings of the National Academy of Sciences 107:8877–8882, 2010). They further suggest that color preferences are calculated at a given moment, depending on which color–object associations are currently most activated or salient. Color preferences are thus far more dynamic and context-dependent than has previously been believed. 相似文献
256.
Lauren L. Garbacz Dawn M. Brown Grace A. Spee Antonio J. Polo Karen S. Budd 《Clinical child and family psychology review》2014,17(3):230-247
The current review evaluates the use of treatment fidelity strategies in evidence-based parent training programs for treating externalizing disorders. We used a broad framework for evaluating treatment fidelity developed by the National Institutes of Health Treatment Fidelity Workgroup that includes the aspects of treatment design, treatment delivery, training providers, and assessment of participant receipt of treatment and enactment of treatment skills. Sixty-five articles reporting outcome trials of evidence-based parent training programs met inclusion criteria and were coded for treatment fidelity strategies. The mean adherence to fidelity strategies was .73, which was higher than two previous review studies employing this framework in the health literature. Strategies related to treatment design showed the highest mean adherence (.83), whereas training of providers and enactment of treatment skills had the lowest (.58). In light of an increasing emphasis on effectiveness and dissemination trials, the broader treatment fidelity framework as applied in this review focuses needed attention on areas often overlooked in fidelity practices, such as training providers and generalization of treatment skills. We discuss the strengths and limitations of fidelity practices in parent training studies, implications of these findings, and areas for future research. 相似文献
257.
Jan Zirk‐Sadowski Charlotte Lamptey Amy Devine Mark Haggard Dénes Szűcs 《Developmental science》2014,17(3):366-375
We studied whether the origins of math anxiety can be related to a biologically supported framework of stress induction: (un)controllability perception, here indicated by self‐reported independent efforts in mathematics. Math anxiety was tested in 182 children (8‐ to 11‐year‐olds). Latent factor modeling was used to test hypotheses on plausible causal processes and mediations within competing models in quasi‐experimental contrasts. Uncontrollability perception in mathematics, or (in)dependence of efforts, best fit the data as an antecedent of math anxiety. In addition, the relationship of math anxiety with gender was fully mediated by adaptive perception of control (i.e. controllability). That is, young boys differ from girls in terms of their experience of control in mathematics learning. These differences influence math anxiety. Our findings are consistent with recent suggestions in clinical literature according to which uncontrollability makes women more susceptible to fear and anxiety disorders. A video abstract of this article can be viewed at http://www.youtube.com/watch?v=I4b_47Y-e_U 相似文献
258.
Kimberly Cuevas Kirby Deater‐Deckard Jungmeen Kim‐Spoon Amanda J. Watson Katherine C. Morasch Martha Ann Bell 《Developmental science》2014,17(2):224-238
Executive functions (EFs; e.g. working memory, inhibitory control) are mediated by the prefrontal cortex and associated with optimal cognitive and socio‐emotional development. This study provides the first concurrent analysis of the relative contributions of maternal EF and caregiving to child EF. A group of children and their mothers (n = 62) completed age‐appropriate interaction (10, 24, 36 months) and EF tasks (child: 24, 36, and 48 months). Regression analyses revealed that by 36 months of age, maternal EF and negative caregiving behaviors accounted for unique variance in child EF, above and beyond maternal education and child verbal ability. These findings were confirmed when using an early child EF composite‐our most reliable measure of EF – and a similar pattern was found when controlling for stability in child EF. Furthermore, there was evidence that maternal EF had significant indirect effects on changes in child EF through maternal caregiving. At 24 months, EF was associated with maternal EF, but not negative caregiving behaviors. Taken together, these findings suggest that links between negative caregiving and child EF are increasingly manifested during early childhood. Although maternal EF and negative caregiving are related, they provide unique information about the development of child EF. A video abstract of this article can be viewed at http://www.youtube.com/watch?v=NPKXFbbrkps 相似文献
259.
Shirley Larkin Rob Freathy Karen Walshe Jonathan Doney 《Journal of Beliefs & Values》2014,35(2):175-186
Recent reports on Religious Education (RE) in England and Wales highlight the need for guidance on pedagogy and learning. The RE-flect project addressed this by promoting the creation of metacognitively oriented learning environments in primary school RE classrooms. Six primary school teachers and 160 pupils (eight to 10 years of age) took part in the second year of this two year project. Meta-thinking, worldview and resources zones were created in each classroom. Attainment in RE and pupil perceptions of the learning environment were measured. Data from classroom observations, Worldview Profiles (WVP), and pupil and teacher interviews were analysed qualitatively. Results show an overall increase in attainment; a positive change in pupil perceptions of the learning environment; and the ability of pupils to reflect on and articulate their worldviews. Implications for RE curricular and pedagogy are discussed. 相似文献
260.
In the current brief report, we examined threat perception in a group of young children who may be at‐risk for anxiety due to extreme temperamental shyness. Results demonstrate specific differences in the processing of social threats: 4‐ to 7‐year‐olds in the high‐shy group demonstrated a greater bias for social threats (angry faces) than did a comparison group of low‐shy children. This pattern did not hold for non‐social threats like snakes: Both groups showed an equal bias for the detection of snakes over frogs. The results suggest that children who are tempermentally shy have a heightened sensitivity to social signs of threat early in development. These findings have implications for understanding mechanisms of early threat sensitivity that may predict later socioemotional maladjustment. 相似文献