全文获取类型
收费全文 | 392篇 |
免费 | 15篇 |
专业分类
407篇 |
出版年
2023年 | 5篇 |
2022年 | 5篇 |
2021年 | 4篇 |
2020年 | 12篇 |
2019年 | 14篇 |
2018年 | 11篇 |
2017年 | 16篇 |
2016年 | 21篇 |
2015年 | 9篇 |
2014年 | 11篇 |
2013年 | 42篇 |
2012年 | 14篇 |
2011年 | 21篇 |
2010年 | 17篇 |
2009年 | 11篇 |
2008年 | 20篇 |
2007年 | 16篇 |
2006年 | 17篇 |
2005年 | 7篇 |
2004年 | 14篇 |
2003年 | 8篇 |
2002年 | 12篇 |
2001年 | 4篇 |
2000年 | 10篇 |
1999年 | 8篇 |
1998年 | 6篇 |
1997年 | 4篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 6篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 5篇 |
1984年 | 7篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 4篇 |
1973年 | 1篇 |
1972年 | 2篇 |
1969年 | 1篇 |
1967年 | 1篇 |
1966年 | 2篇 |
排序方式: 共有407条查询结果,搜索用时 15 毫秒
1.
A tether system has been developed for continuous monitoring of blood pressure in the micropig. The micropig is a suitable model for blood-pressure research because of the similarity of its cardiovascular system to that of humans and because of its sensitivity to high sodium intake. The system consists of a metal boom, attached via a universal joint to a wall 6 ft above floor level, that extends horizontally to the center of the enclosure. A fluid and electronic swivel affixed to the boom is connected to a flexible, hollow, metal tether that descends to a vest worn by the micropig. The vest contains a pressure transducer to which an indwelling arterial catheter is connected via a stopcock. The transducer cable and an infusion line ascend through the interior of the tether to the swivel. The system remains in equilibrium through a system of pulleys and counterweights. Continuous, 24-h recording shows a diurnal variation characterized by higher heart rate but lower blood pressure during the day than at night. The system has been found to be effective for continuous studies over intervals of a month or more. 相似文献
2.
Robyn Fivush 《Sex roles》1989,20(11-12):675-691
In this study, the ways in which mothers and their 30–35-month-old children discussed the emotional aspects of past experiences was explored. Although previous research has established that children this age talk about emotions, and some studies have found sex differences between mother-daughter and mother-son dyads in these conversations, no study has examined explicitly the way in which emotions about the past are discussed. This is an important research question because emotional aspects of events may help provide an evaluative framework for thinking about and talking about the past. The results suggest that, with daughters, mothers focus more on positive emotions and tend not to attribute negative emotions to the child. With sons, positive and negative emotions are discussed equally. Moreover, mothers never discuss anger with their daughters but they do with their sons. Finally, mother-daughter conversations emphasize the emotional state itself, whereas mother-son conversations often discuss the causes and consequences of emotions. The way in which these patterns might contribute to children's developing understanding of gender-appropriate emotional reactions are discussed. 相似文献
3.
4.
A circuit to permit an electronic drinkometer to operate during footshock is described. The circuit employs a diode matrix that allows all grid bars to be connected at one point to form one electrode of the drinkometer; it is isolated at another point so as not to shortcircuit the impressed footshock. 相似文献
5.
6.
Judy A. Ungerer Robyn Dolby Brent Waters Bryanne Barnett Norm Kelk Vivian Lewin 《Motivation and emotion》1990,14(2):93-106
A longitudinal study of 45 mothers and their first-born infants was conducted to identify developmentally meaningful, individual differences in children's primitive empathic responding at 12 months of age, and to determine whether differences in self-regulatory skills assessed at 4 months might underlie any differences in empathic responding observed. Personal distress responses analogous to those observed in older children and adults were identified in one-third of the sample at 12 months of age. These distress responses were associated with indices of poorer self-regulatory skills in social contexts at 4 months of age. The results are interpreted within the broader framework of the development of self-regulatory strategies in the early childhood years.This research was supported by grants from the Australian Research Council, the National Research Fellowship Scheme, and the Macquarie University Research Grant Scheme. We thank Judy Chan, Alison Malbourne, Sylvana Sturevska, and Lorraine Smith for their assistance in data collection and analysis. 相似文献
7.
Fivush Robyn 《Consciousness and cognition》1994,3(3-4)
The ways in which event memories may be reconstructed or transformed through discussion with others is a critical question both for understanding basic memory processes and for issues concerning legal testimony. In this research, white middle-class preschool children were interviewed first by their mothers and then by a female experimenter about personally experienced events when they were 40, 46, 58, and 70 months of age. Analyses indicated that at all four time points children only incorporated about 9% of the information initially recounted by the mother into their independent recall of the event with the experimenter. Moreover, children only repeated about 20% of the information they themselves recalled across the two interviews. Additional analyses indicated that information mutually discussed by the mother and child was no more likely to be incorporated or repeated when recalling the event with the experimenter than information not mutually discussed. These results indicate that young children′s personal memories are not so fragile that they easily incorporate information provided by another into their own recall. 相似文献
8.
Katrina N. Rhymer Christopher H. Skinner Carlen Henington Robyn A. D'Reaux SanPier Sims 《Journal of applied behavior analysis》1998,31(4):673-677
A multiple baseline design was used to evaluate the effects of Van Houten and Thompson's (1976) explicit timing procedure on problem completion rates and accuracy levels in African-American third-grade students. During the explicit timing phase, students were told that they were being timed and were instructed to circle the last problem completed at each 1-min interval. Results showed that the explicit timing procedure increased problem completion rates. A decreasing trend in percentage of problems correct also occurred. Exploratory data analysis suggested that decreases in accuracy were not caused by the explicit timing procedure and did not occur in students who had attained high levels of preintervention accuracy. Discussion focuses on recommendations for educators who wish to use timing procedures to increase students' rates of accurate responding. 相似文献
9.
A framework for conceptualizing the relationship between event knowledge and planning is proposed, and two experiments are reported that examined children's ability to draw on event knowledge in planning. Preschool children were asked to plan and execute shopping trips to a pretend grocery store. Half of the children planned for two events on successive trials (Level 1, single-goal planning) and half of the children planned for two events simultaneously (Level 2, multiple-event planning). The amount of external support for planning was also manipulated. In Experiment 1, 3-, 4-, and 5-year-olds were presented with either a clustered or interleaved display. In Experiment 2, 3- and 4-year-olds were given adult assistance in plan construction. Results indicated that children's planning becomes more complex and flexible with age. Older children also rely less on external supports for planning. However, when external support was provided, 3- and 4-year-olds displayed higher-level planning abilities. Results are discussed in terms of the roles of event knowledge and external support in the early development of planning skills. 相似文献
10.