全文获取类型
收费全文 | 3524篇 |
免费 | 130篇 |
出版年
2022年 | 19篇 |
2021年 | 19篇 |
2020年 | 40篇 |
2019年 | 57篇 |
2018年 | 83篇 |
2017年 | 78篇 |
2016年 | 94篇 |
2015年 | 81篇 |
2014年 | 84篇 |
2013年 | 360篇 |
2012年 | 159篇 |
2011年 | 154篇 |
2010年 | 125篇 |
2009年 | 108篇 |
2008年 | 155篇 |
2007年 | 184篇 |
2006年 | 144篇 |
2005年 | 120篇 |
2004年 | 117篇 |
2003年 | 133篇 |
2002年 | 140篇 |
2001年 | 66篇 |
2000年 | 50篇 |
1999年 | 69篇 |
1998年 | 62篇 |
1997年 | 54篇 |
1996年 | 60篇 |
1995年 | 40篇 |
1994年 | 43篇 |
1993年 | 43篇 |
1992年 | 54篇 |
1991年 | 43篇 |
1990年 | 49篇 |
1989年 | 35篇 |
1988年 | 30篇 |
1987年 | 33篇 |
1986年 | 36篇 |
1985年 | 38篇 |
1984年 | 51篇 |
1983年 | 36篇 |
1982年 | 50篇 |
1981年 | 39篇 |
1980年 | 32篇 |
1979年 | 31篇 |
1978年 | 20篇 |
1977年 | 29篇 |
1976年 | 26篇 |
1975年 | 14篇 |
1974年 | 17篇 |
1973年 | 14篇 |
排序方式: 共有3654条查询结果,搜索用时 46 毫秒
281.
Preschoolers who explore objects haptically often fail to recognize those objects in subsequent visual tests. This suggests that children may represent qualitatively different information in vision and haptics and/or that children’s haptic perception may be poor. In this study, 72 children (2½-5 years of age) and 20 adults explored unfamiliar objects either haptically or visually and then chose a visual match from among three test objects, each matching the exemplar on one perceptual dimension. All age groups chose shape-based matches after visual exploration. Both 5-year-olds and adults also chose shape-based matches after haptic exploration, but younger children did not match consistently in this condition. Certain hand movements performed by children during haptic exploration reliably predicted shape-based matches but occurred at very low frequencies. Thus, younger children’s difficulties with haptic-to-visual information transfer appeared to stem from their failure to use their hands to obtain reliable haptic information about objects. 相似文献
282.
The number of HIV-positive Latinas of child-bearing age living on the US–Mexico border is a growing concern. Little is known
about how religious beliefs influence the reproductive health decisions of these women in light of disease demands and cultural
and religious norms that support high fertility rates and childbearing. Such decisions may be further complicated by the stigma
of HIV/AIDS and structural issues related to immigration status and trans-border lives. This paper analyzes extant literature
and supports the need for further research so that policy makers and heath and social service providers can develop meaningful
and comprehensive reproductive-health related interventions. 相似文献
283.
The role of sensory awareness in movement control is receiving increasing interest in sports and clinical literature as a feed-forward and feedback mechanism. The aim of the study was to assess the feasibility and effect of training in sensory awareness on dexterity in healthy adults. 29 healthy students were randomly allocated to a single-group, sensory awareness lesson with the dominant hand, the same lesson with the nondominant hand, or to a sham control group. Dexterity measures included the Purdue Pegboard Test, a grip-lift manipulandum, and perceived changes using a questionnaire. The sensory awareness lesson with the dominant hand produced a statistically significant improvement in mean dexterity compared to the control group, but not between the other two pairs of groups. The sensory awareness training paradigm is feasible and a single session improved dexterity in healthy adults. 相似文献
284.
Evidence suggests that parental marital discord contributes to the development of internalizing and externalizing symptoms
in children and adolescents. Few studies, however, have examined the association between parental marital discord and youth’s
response to treatment. The present study examined the impact of interparental discord on treatment response in a randomized
control trial of adolescents with major depression enrolled in the Treatment for Adolescents with Depression Study (TADS).
Participants were 260 adolescents from two-parent households randomly assigned to one of four treatment groups: fluoxetine
(FLX), cognitive behavior therapy (CBT), their combination (COMB), or placebo (PBO). Logistic regressions revealed that parental
marital discord interacted with youth gender and co-morbid oppositionality symptoms to predict group differences in treatment
response. 相似文献
285.
Eimer M Kiss M Nicholas S 《Journal of experimental psychology. Human perception and performance》2011,37(6):1758-1766
When target-defining features are specified in advance, attentional target selection in visual search is controlled by preparatory top-down task sets. We used ERP measures to study voluntary target selection in the absence of such feature-specific task sets, and to compare it to selection that is guided by advance knowledge about target features. Visual search arrays contained two different color singleton digits, and participants had to select one of these as target and report its parity. Target color was either known in advance (fixed color task) or had to be selected anew on each trial (free color-choice task). ERP correlates of spatially selective attentional target selection (N2pc) and working memory processing (SPCN) demonstrated rapid target selection and efficient exclusion of color singleton distractors from focal attention and working memory in the fixed color task. In the free color-choice task, spatially selective processing also emerged rapidly, but selection efficiency was reduced, with nontarget singleton digits capturing attention and gaining access to working memory. Results demonstrate the benefits of top-down task sets: Feature-specific advance preparation accelerates target selection, rapidly resolves attentional competition, and prevents irrelevant events from attracting attention and entering working memory. 相似文献
286.
We use data collected from employees in five transition economies to study whether locus of control and preference for challenge versus affiliation are positively related to worker performance. We find that earnings are positively related to the internal locus of control and preference for challenge among participants of the Armenian and Serbian surveys. In the Russian sample, earnings tend to be higher among workers with a more internal locus of control. Earnings are not systematically related to personality in Kazakhstan and Kyrgyzstan. For most countries, self-reported performance tends to be significantly higher among workers with preference for challenge. Generally, the size of the personality effect on performance is at least as great as the effect of experience or education. Although more research needs to be done before final conclusions about the causes of cross-country differences can be made, we argue that variation in personality effects across countries may be influenced by level of economic development, degree of market-orientation, and cultural diversity. 相似文献
287.
288.
Susan Hiraki Erica S. Rinella Freya Schnabel Ruth Oratz Harry Ostrer 《Journal of genetic counseling》2014,23(4):604-617
With the completion of the Human Genome Project and the development of high throughput technologies, such as next-generation sequencing, the use of multiplex genetic testing, in which multiple genes are sequenced simultaneously to test for one or more conditions, is growing rapidly. Reflecting underlying heterogeneity where a broad range of genes confer risks for one or more cancers, the development of genetic cancer panels to assess these risks represents just one example of how multiplex testing is being applied clinically. There are a number of issues and challenges to consider when conducting genetic testing for cancer risk assessment, and these issues become exceedingly more complex when moving from the traditional single-gene approach to panel testing. Here, we address the practical considerations for clinical use of panel testing for breast, ovarian, and colon cancers, including the benefits, limitations and challenges, genetic counseling issues, and management guidelines. 相似文献
289.
Despite ongoing public calls for reform, the mental health needs of many children with psychological, emotional and behavioral disorders remain unmet. In response, providers continue to seek effective alternatives to institutional treatment by implementing comprehensive systems of care. The Children’s Enhancement Project (CEP) is a collaborative effort to provide holistic, community-based mental health services for children with an individualized, flexible, family-driven approach. We conducted a process evaluation of CEP’s early stage development and implementation utilizing both qualitative stakeholder interviews and quantitative survey components. The current article describes that evaluation and highlights the challenges and potential solutions encountered in developing a system of care. The lessons learned regarding system of care development, including the importance of a shared vision, establishing programmatic guidelines, achieving collaboration, and addressing sustainability concerns, are discussed. 相似文献
290.
Yvonne Humenay Roberts Frank J. Snyder Joy S. Kaufman Meghan K. Finley Amy Griffin Janet Anderson Tim Marshall Susan Radway Virginia Stack Cindy A. Crusto 《Journal of child and family studies》2014,23(2):214-224
The arrest of a parent or other family member can be detrimental to children’s health. To study the impact of exposure to the arrest of a family member on children’s mental health and how said association may change across developmental periods, we examined baseline data for children (birth through 11 years) entering family-based systems of care (SOC). Children exposed to the arrest of a family member had experienced significantly more 5.38 (SD = 2.59) different types of potentially traumatic events (PTE) than children not exposed to arrest 2.84 (SD = 2.56). Multiple regression model results showed that arrest exposure was significantly associated with greater behavioral and emotional challenges after controlling for children’s age, gender, race/ethnicity, household income, caregiver’s education, parenting factors, and other PTE exposure. Further analyses revealed differences in internalizing and externalizing behaviors associated with arrest exposure across developmental levels. This study highlights some of the mental health challenges for children exposed to the arrest of a family member, while adding to our knowledge of how such an event affects children across different developmental periods. More trauma-informed, developmentally appropriate systems need to be in place at all levels to assist children and families experiencing arrest. 相似文献