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61.
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Consumption of food pellets was examined in four water-deprived rats during 1-h sessions in which water was presented once every 30, 60, or 120 sec independently of the rats’ behavior according to three fixed-time (FT) schedules. Correlated with each FT condition was a continuous reinforcement (CRF) control condition in which the rats received, at the start of the session, the number of dipper presentations that were programmed to occur during the corresponding FT condition. During both the FT and CRF conditions, pellets per dipper presentation decreased and food intake rate increased with rate of water presentation, and there was a direct linear relation between log food intake and log water intake. For each of these three measures there was less eating under the FT condition than under the CRF condition, but the difference between the FT and CRF functions decreased at shorter FT values. These data are discussed in terms of the effects of amount of water on food consumption and the principle of temporal summation. 相似文献
63.
煤粉炉烟气中汞浓度测试和分布 总被引:4,自引:0,他引:4
参照美国标准实验方法(ASTM)中关于汞的OHM等速取样和化学分析法,结合汞的SCEM在线测量技术,利用一多功能流动实验室,对一满负荷运行的100 MW煤粉锅炉尾部烟气系统进行了单质汞、氧化态汞和颗粒态汞的现场测试和分析.得到了空气预热器、静电除尘器前后烟气中气态、固态和烟气中总汞的浓度及其分布.结果表明烟气中气态总汞的浓度随温度的降低发生着氧化态汞向颗粒汞的转化.在ESP之后的清洁烟气中,OHM和SCEM方法的测试结果吻合较好;在含颗粒浓度较高的烟气中,2种方法存在较大的偏差,原因在于OHM取样过滤器中形成一定厚度的飞灰.该飞灰颗粒对烟气中气态汞有吸附作用并形成颗粒汞. 相似文献
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Does Mathematics Remediation Work?: A Comparative Analysis of Academic Attainment among Community College Students 总被引:2,自引:2,他引:2
Peter Riley Bahr 《Research in higher education》2008,49(5):420-450
Postsecondary remediation is a controversial topic. On one hand, it fills an important and sizeable niche in higher education.
On the other hand, critics argue that it wastes tax dollars, diminishes academic standards, and demoralizes faculty. Yet,
despite the ongoing debate, few comprehensive, large-scale, multi-institutional evaluations of remedial programs have been
published in recent memory. The study presented here constitutes a step forward in rectifying this deficit in the literature,
with particular attention to testing the efficacy of remedial math programs. In this study, I use hierarchical multinomial
logistic regression to analyze data that address a population of 85,894 freshmen, enrolled in 107 community colleges, for
the purpose of comparing the long-term academic outcomes of students who remediate successfully (achieve college-level math
skill) with those of students who achieve college-level math skill without remedial assistance. I find that these two groups
of students experience comparable outcomes, which indicates that remedial math programs are highly effective at resolving
skill deficiencies.
相似文献
Peter Riley BahrEmail: |
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Elizabeth A. Riley Gomathi Sitharthan Lindy Clemson Milton Diamond 《Sex education》2013,13(6):644-659
Gender variance confronts widely held assumptions that children born as males will act like ‘boys’ and children born as females will act like ‘girls’. This imposed binary has the effect of perpetuating negativity towards people who express themselves with gendered variations in attire, behaviour or preferences. Despite the existence of gender-variant individuals in every culture and throughout time, many people are unaware that diversity in gender expression and sexual formation is a naturally occurring phenomenon. This qualitative study aimed to establish the needs of gender-variant children and their parents in order to inform education programmes, policies and clinical approaches to gender variance. Three Internet surveys were conducted to explore the experiences of parents raising gender-variant children, the childhood experiences of transgender adults and the views of professionals who work with the transgender community. The needs of gender-variant children emerged in terms of the need for information, peer contact, personal gender expression, safety, and to be heard and accepted by their parents. The most common needs for parents were for information (stories from other parents, research and guidelines; peer support) and educational resources for schools, professionals and local communities. The paper provides comparisons between the three participant groups and recommendations for future research. 相似文献
68.
Tasha R. Rennels 《传播与批判/文化研究》2013,10(3):271-288
Depictions of white working-class people are steadily on the rise in reality television. To understand this phenomenon, and the ways in which it articulates white working-class people in the United States today, I analyze Here Comes Honey Boo Boo, a popular reality series on TLC featuring a self-described “redneck” family. I argue that this series highlights the family's inability—because of their working-class status—to conform to “ideal whiteness,” a whiteness that displays dominant cultural standards bolstered by neoliberalism, such as wealth, rationality, personal responsibility, and self-control. The family members consequently become exemplars of “inappropriate whiteness,” a marginal identity presented as humorous and, through the use of surveillance and spectacle, authentic. 相似文献
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Peter Riley Bahr 《Research in higher education》2012,53(1):94-121
The traditional unidirectional (“linear”) postsecondary path from high school to a community college to a 4-year institution
into the workforce represents accurately a decreasing proportion of the pathways actually taken by students through higher
education. Instead, students increasingly exhibit patterns of enrollment that take them through multiple postsecondary institutions,
both within levels of the higher education system (e.g., multiple community colleges, multiple 4-year institutions) and across
levels (e.g., movement back and forth between community colleges and 4-year institutions). These “swirling” patterns of enrollment
are widely recognized by scholars of higher education, but they remain poorly understood. In this study, I employ data that
address 89,057 first-time students in the California community college system to answer a number of key questions concerning
lateral transfer between community colleges, which, according to prior research, constitutes one sizeable component of student
“swirl”. Building on the very limited work on this topic, I examine whether the reported high prevalence of lateral transfer
holds true under a more stringent operational framework than that employed in prior work. I explore whether lateral transfer
is primarily an artifact of students enrolling simultaneously in multiple community colleges, sometimes called “double-dipping”.
I investigate the timing of lateral transfer from several different perspectives to determine how lateral transfer fits in
students’ progress and development. Finally, I probe the relationship between students’ level of academic investment in their
current community college and the risk of lateral transfer. 相似文献