全文获取类型
收费全文 | 2151篇 |
免费 | 63篇 |
专业分类
教育 | 1761篇 |
科学研究 | 31篇 |
各国文化 | 45篇 |
体育 | 101篇 |
综合类 | 1篇 |
文化理论 | 6篇 |
信息传播 | 269篇 |
出版年
2023年 | 13篇 |
2022年 | 25篇 |
2021年 | 31篇 |
2020年 | 71篇 |
2019年 | 112篇 |
2018年 | 133篇 |
2017年 | 164篇 |
2016年 | 136篇 |
2015年 | 84篇 |
2014年 | 110篇 |
2013年 | 505篇 |
2012年 | 81篇 |
2011年 | 93篇 |
2010年 | 62篇 |
2009年 | 68篇 |
2008年 | 68篇 |
2007年 | 57篇 |
2006年 | 44篇 |
2005年 | 33篇 |
2004年 | 36篇 |
2003年 | 41篇 |
2002年 | 36篇 |
2001年 | 16篇 |
2000年 | 37篇 |
1999年 | 19篇 |
1998年 | 15篇 |
1997年 | 16篇 |
1996年 | 18篇 |
1995年 | 14篇 |
1994年 | 14篇 |
1993年 | 6篇 |
1992年 | 7篇 |
1991年 | 8篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1980年 | 3篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有2214条查询结果,搜索用时 0 毫秒
81.
Two squirrel monkeys searched for a reward buried in 1 of 144 holes that formed a 12×12 grid (48×50 cm). An array of vertical, colored landmarks was placed on the grid, and their locations on the grid were changed from trial to trial. During training trials, the mealworm reward was placed either in the center of a square array of landmarks (Experiments 1 and 3) or midway between two landmarks (Experiment 2). On nonrewarded test trials, the monkeys searched among landmarks placed in the same arrays as those used in training and among landmarks placed in an expanded array (Experiments 1 and 2) or in an array intermediate between the two arrays used in training (Experiment 3). Distributions of searches on test trials indicated that the monkeys searched mostly within the configuration of the landmarks but that they had not coded the location of the reward as being either in the middle of the landmarks or at a fixed distance and direction from an individual landmark. 相似文献
82.
Jennifer L. Brace Rachael R. Baiduc Denise L. Drane Luke C. Flores Greg J. Beitel 《Mentoring & Tutoring: Partnership in Learning》2013,21(4):377-399
ABSTRACTUndergraduate research experience has been shown to enhance student learning and improve persistence in science, technology, engineering, and mathematics (STEM). Researchers studying undergraduate research experiences have largely focused on student outcomes and have seldom investigated the outcomes of graduate and postdoctoral mentors. Here, we report a non-credit, year-long mentor professional development program designed for graduate students, postdoctoral scholars, and research staff in STEM. Mentors attended a series of six interactive and discussion-based workshops and mentored first-year undergraduate students in independent summer research projects. We report evaluation findings for three mentor cohorts using a combination of qualitative analysis of mentoring philosophies and quantitative assessment of pre- and post-surveys about mentoring objectives and skills. Results indicate that mentors gained self-efficacy in some objectives and skills. However, many other objectives and skills remained unchanged. We explore possible explanations for the lack of more broad-scale gains across survey items and present ideas for program improvement. 相似文献
83.
84.
McIntosh JE 《Child abuse & neglect》2002,26(3):229-241
OBJECTIVE: This article provides a clinical perspective on the combined impacts on children of spousal violence in the home and the absence of attuned parental thought that accompanies it. METHODS: This article takes the form of a commentary, drawing on clinical case studies and research literature to illustrate the child's experience of "unthinking," nonreflective parental states of mind, from the point of witnessing violence through to contact arrangements post-separation. Parallel dynamics and impacts are discussed with caregiving and legislative systems. RESULTS: The article suggests that "unthinking" states of mind in parents can be as damaging for a child as the overt witnessing and experiencing of violence. CONCLUSIONS: The prevention or early overturning of unthinking states of mind, in and out of the home, greatly influences the nature of a child's recovery from domestic violence. 相似文献
85.
Elena Bray Speth Jennifer L. Momsen Gregory A. Moyerbrailean Diane Ebert-May Tammy M. Long Sara Wyse Debra Linton 《CBE life sciences education》2010,9(3):323-332
Biology of the twenty-first century is an increasingly quantitative science. Undergraduate biology education therefore needs to provide opportunities for students to develop fluency in the tools and language of quantitative disciplines. Quantitative literacy (QL) is important for future scientists as well as for citizens, who need to interpret numeric information and data-based claims regarding nearly every aspect of daily life. To address the need for QL in biology education, we incorporated quantitative concepts throughout a semester-long introductory biology course at a large research university. Early in the course, we assessed the quantitative skills that students bring to the introductory biology classroom and found that students had difficulties in performing simple calculations, representing data graphically, and articulating data-driven arguments. In response to students'' learning needs, we infused the course with quantitative concepts aligned with the existing course content and learning objectives. The effectiveness of this approach is demonstrated by significant improvement in the quality of students'' graphical representations of biological data. Infusing QL in introductory biology presents challenges. Our study, however, supports the conclusion that it is feasible in the context of an existing course, consistent with the goals of college biology education, and promotes students'' development of important quantitative skills. 相似文献
86.
Susan Clayton Jerry Luebke Carol Saunders Jennifer Matiasek Alejandro Grajal 《Environmental Education Research》2014,20(4):460-475
Societal response to climate change has been inadequate. A perception that the issue is both physically and temporally remote may reduce concern; concern may also be affected by the political polarization surrounding the issue in the USA. A feeling of connection to nature or to animals may increase personal relevance, and a supportive social context may counteract political tensions. Zoos may provide opportunities for both sense of connection and social support. We surveyed over 7000 zoo and aquarium visitors to examine the ways in which a feeling of personal connection among zoo visitors may encourage concern about climate change. Results show that feeling connected to animals at the zoo is significantly associated with cognitive and emotional responses to climate change, as well as with other social groupings and social responses. Overall, the zoo seems to present a supportive social context for considering the topic. 相似文献
87.
Failure Modes and Effects Analysis (FMEA) is a proactive assessment tool originally created for quality assurance in manufacturing industries. FMEA involves the assignment of rankings for frequency, severity, and detection of errors within a process. Catalogers at ProQuest undertook an innovative project to use FMEA to evaluate MARC record production. This article provides an overview of FMEA for process evaluation and summarizes an application for cataloging. It considers the tool's value for error-proofing in MARC record creation and how FMEA might be applied more effectively in a variable environment. 相似文献
88.
You've Been Warned: Does Information About Pitfalls of Technological Toys Affect Caregiver Behavior?
Although the presence of toys in childhood has remained steady for decades, the types of toys that fill children's toy boxes have changed, especially over the last 10–15 years. Many of today's toys are marked by technological enhancements, from a shape sorter driven by a singing bear to robotic plastic animals designed to match a toddler's favorite television show. Although examining the effects of these changes is still an unexplored area, research to date suggests that there may be costs to the quality of caregiver–child interaction when using these toys together. This leads to two possibilities: (1) the design of the enhancements themselves hurt interactions; or (2) these toys can still be beneficial to interactions, but caregivers simply need to be aware of the potential pitfalls. In this study, we explore whether providing caregivers with a subtle cue about the potential negative impacts of technological toys on caregiver–child interaction affects their behavior. 相似文献
89.
90.
Jennifer H. Lindstrom 《Learning disabilities research & practice》2007,22(4):229-236
One of the most significant barriers facing postsecondary students with reading and written expression disorders who are eligible to receive specific accommodations is the lack of professional knowledge pertaining to issues surrounding accommodations. Though guided by Section 504 of the Rehabilitation Act of 1973 and the Americans with Disabilities Act, the process by which accommodation decisions are made varies considerably across institutions of higher education. Given the recent rise in litigation surrounding the practice of how accommodations are determined as well as the increasing number of postsecondary students with reading and writing disabilities who are requesting accommodations, it is imperative that accommodation decisions be defensible and supported by empirical research. The purpose of this article is to provide an overview of current research on the effectiveness of accommodations for postsecondary students with language‐based learning disabilities, discuss important considerations in the accommodation selection process, and offer recommendations for future research. 相似文献