全文获取类型
收费全文 | 22408篇 |
免费 | 104篇 |
出版年
2023年 | 12篇 |
2021年 | 19篇 |
2020年 | 37篇 |
2019年 | 51篇 |
2018年 | 3514篇 |
2017年 | 2846篇 |
2016年 | 2306篇 |
2015年 | 229篇 |
2014年 | 121篇 |
2013年 | 339篇 |
2012年 | 649篇 |
2011年 | 2468篇 |
2010年 | 2561篇 |
2009年 | 1518篇 |
2008年 | 1756篇 |
2007年 | 2263篇 |
2006年 | 96篇 |
2005年 | 295篇 |
2004年 | 233篇 |
2003年 | 183篇 |
2002年 | 133篇 |
2001年 | 60篇 |
2000年 | 89篇 |
1999年 | 52篇 |
1998年 | 52篇 |
1997年 | 48篇 |
1996年 | 46篇 |
1995年 | 44篇 |
1994年 | 35篇 |
1993年 | 27篇 |
1992年 | 29篇 |
1991年 | 20篇 |
1990年 | 34篇 |
1989年 | 23篇 |
1988年 | 15篇 |
1987年 | 17篇 |
1986年 | 13篇 |
1985年 | 15篇 |
1984年 | 19篇 |
1983年 | 27篇 |
1982年 | 33篇 |
1981年 | 17篇 |
1980年 | 23篇 |
1979年 | 14篇 |
1978年 | 18篇 |
1977年 | 15篇 |
1976年 | 14篇 |
1975年 | 15篇 |
1974年 | 16篇 |
1973年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
181.
This article examines whether various cognitive abilities are associated with symptoms of ADHD. Cognitive ability is conceptualized using Cattell-Horn-Carroll (CHC) theory as measured using the Woodcock-Johnson Tests of Cognitive Ability (3rd ed.). This article also examines whether test session behavior mediates the association between cognitive ability and ADHD. Participants are children ages 6 to 12 with (n= 33) and without (n= 19) ADHD. Results show that inattentive symptoms of ADHD are significantly related to the CHC ability of processing speed above and beyond the effect of test session behavior. Symptoms of ADHD (both inattention and hyperactivity/impulsivity) are also significantly associated with visual spatial processing, but this is completely mediated by test session behavior. It is concluded that inattentive symptoms of ADHD are associated with slower processing speed and that this relationship is not explained by test session behavior. 相似文献
182.
183.
184.
Ames SL Gallaher PE Sun P Pearce S Zogg JB Houska BR Leigh BC Stacy AW 《Behavior research methods》2005,37(3):470-479
A Web-based coding application was designed to improve coding efficiency and to provide a systematic means of evaluating responses
to open-ended assessments. The system was developed for use by multiple raters to assign open-ended responses to predetermined
categories. The application provides a software environment for efficiently supervising the work of coders and evaluating
the quality of the coding by (1) systematically presenting open-ended responses to coders, (2) tracking each coder’s categorized
responses, and (3) assessing interrater consistency at any time in order to identify coders in need of further training. In
addition, the application can be set to automatically assign repeated responses to categories previously identified as appropriate
for those responses. To evaluate the efficacy of the coding application and to determine the statistical reliability of coding
open-ended data within this application, we examined data from two empirical studies. The results demonstrated substantial
interrater agreement on items assigned to various categories across free and controlled association tasks. Overall, this new
coding application provides a feasible method of reliably coding open-ended data and makes the task of coding these data more
manageable. 相似文献
185.
This study examined body-esteem in 10-yr.-old children. The study group comprised 960 schoolchildren, 515 girls and 445 boys (M age= 10.4, SD=0.5). Analysis showed that girls who were overweight had more negative body-esteem on all dimensions (weight, appearance, and attribution). The overweight boys had more negative perceptions on only two dimensions (weight and appearance). Twice as many girls perceived themselves as too fat (20%) as too skinny (10%). Of the girls who perceived themselves as fat, only 31% were overweight; similarly only 33% of the boys who perceived themselves as fat were overweight. The children's perception of their weight seemed as important as their actual weight and was associated with their body-esteem in the same way. Although few children had dieted (7% of the girls and 5% of the boys), the ones who had dieted had more negative body-esteem than children who had not dieted. 相似文献
186.
Throughout the U.S., state laws require professionals who work with children to report cases of suspected child abuse to child protection services. Both practically and conceptually, however, significant problems arise from a lack of clarity regarding the threshold that has been set for reporting. Specifically, there is no consensus as to what constitutes reasonable suspicion, and little direction for how mandated reporters should gauge their legal and professional responsibilities when they harbor suspicion. In this paper we outline the context of the problem, discuss the nature and scope of its conceptual underpinnings, and offer recommendations for moving towards a concrete, practical solution. 相似文献
187.
Genetic Cancer Risk Assessment and Counseling: Recommendations of the National Society of Genetic Counselors 总被引:4,自引:0,他引:4
Trepanier A Ahrens M McKinnon W Peters J Stopfer J Grumet SC Manley S Culver JO Acton R Larsen-Haidle J Correia LA Bennett R Pettersen B Ferlita TD Costalas JW Hunt K Donlon S Skrzynia C Farrell C Callif-Daley F Vockley CW;National Society of Genetic Counselors 《Journal of genetic counseling》2004,13(2):83-114
These cancer genetic counseling recommendations describe the medical, psychosocial, and ethical ramifications of identifying at-risk individuals through cancer risk assessment with or without genetic testing. They were developed by members of the Practice Issues Subcommittee of the National Society of Genetic Counselors Cancer Genetic Counseling Special Interest Group. The information contained in this document is derived from extensive review of the current literature on cancer genetic risk assessment and counseling as well as the personal expertise of genetic counselors specializing in cancer genetics. The recommendations are intended to provide information about the process of genetic counseling and risk assessment for hereditary cancer disorders rather than specific information about individual syndromes. Key components include the intake (medical and family histories), psychosocial assessment (assessment of risk perception), cancer risk assessment (determination and communication of risk), molecular testing for hereditary cancer syndromes (regulations, informed consent, and counseling process), and follow-up considerations. These recommendations should not be construed as dictating an exclusive course of management, nor does use of such recommendations guarantee a particular outcome. These recommendations do not displace a health care provider's professional judgment based on the clinical circumstances of a client. 相似文献
188.
Randomized clinical trials remain the most valid method of testing the efficacy and safety of treatments. While efforts to elucidate the genetic and neurodevelopmental bases of autism are underway, clinicians and families are in need of scientifically valid information on how to best treat patients with autism. The effectiveness of many interventions currently used in communities has not been adequately tested. Given the high public health relevance of autism treatment research and the low interest of the pharmaceutical industry in autism, the role of the National Institutes of Health in supporting this research is paramount. Among recently launched initiatives in autism clinical trials, there are the Research Units on Pediatric Psychopharmacology Autism Network and the network of centers for Studies to Advance Autism Research and Treatment. These and other government activities in the area of autism clinical trials are here briefly reviewed. 相似文献
189.
Hollander E Phillips A King BH Guthrie D Aman MG Law P Owley T Robinson R 《CNS spectrums》2004,9(1):49-56
There are specific challenges to studying the design of pharmacologic trials in child/adolescent and adult autism, such as subject stratification and parallel versus crossover designs. This article describes how optimal study design is influenced by subject selection and outcome measures chosen. Lessons learned in study design from the Research Units on Pediatric Psychopharmacology Autism Network trial with risperidone, Seaver Center trials with fluoxetine and valproate, Dartmouth trials with amantadine, and National Institutes of Health secretin trials are highlighted. The Internet System for Assessing Autistic Children system for managing multicenter clinical trials in autism and statistical issues in autism research are also described. 相似文献
190.
Catalano GD 《Science and engineering ethics》2004,10(2):409-415
A senior level capstone design experience has been developed and offered with a particular emphasis on many of the professional
issues raised in Accreditation Board for Engineering and Technology (ABET) Engineering Criterion IV. The course has sought
to develop student awareness of the ethical foundation of the engineering profession, the global and societal framework within
which engineers practice, and the environmental impact on engineering. The capstone design course also focused upon improving
the technical communications skills of the graduating senior class with both extensive instruction in writing and multiple
workshops dealing with the art of making an effective oral presentation. The effectiveness of the design course was assessed
using Kirkpatrick’s model for evaluating training programs.
An earlier version of this paper was presented at the “Ethics and Social Responsibility in Engineering and Technology” meeting,
New Orleans, 2003. 相似文献