全文获取类型
收费全文 | 2568篇 |
免费 | 544篇 |
国内免费 | 68篇 |
出版年
2023年 | 15篇 |
2022年 | 14篇 |
2021年 | 59篇 |
2020年 | 25篇 |
2019年 | 168篇 |
2018年 | 174篇 |
2017年 | 186篇 |
2016年 | 124篇 |
2015年 | 125篇 |
2014年 | 70篇 |
2013年 | 149篇 |
2012年 | 51篇 |
2011年 | 57篇 |
2010年 | 35篇 |
2009年 | 65篇 |
2008年 | 55篇 |
2007年 | 57篇 |
2006年 | 39篇 |
2005年 | 38篇 |
2004年 | 21篇 |
2003年 | 23篇 |
2002年 | 21篇 |
2001年 | 20篇 |
2000年 | 19篇 |
1999年 | 9篇 |
1998年 | 12篇 |
1997年 | 21篇 |
1996年 | 4篇 |
1995年 | 11篇 |
1994年 | 5篇 |
1993年 | 7篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1990年 | 5篇 |
1989年 | 2篇 |
1987年 | 4篇 |
1986年 | 1篇 |
1985年 | 126篇 |
1984年 | 136篇 |
1983年 | 117篇 |
1982年 | 127篇 |
1981年 | 133篇 |
1980年 | 162篇 |
1979年 | 149篇 |
1978年 | 123篇 |
1977年 | 96篇 |
1976年 | 96篇 |
1975年 | 75篇 |
1974年 | 83篇 |
1973年 | 57篇 |
排序方式: 共有3180条查询结果,搜索用时 15 毫秒
61.
The effects of flavor preexposure and test interval on conditioned taste aversions were examined in four experiments. In the first three experiments, prior experience with a flavor different from that used as a conditioned-stimulus (CS) produced attenuated aversions when testing occurred after a 1-day interval but not after a 21-day interval. Preexposure to the same stimulus used as a CS produced attenuated aversions at both 1- and 21-day intervals. In Experiment 4, a delay interval between flavor preexposure and conditioning eliminated the attenuating effect of preexposure, but only when different stimuli were used for preexposure and conditioning. These data could not be easily accounted for by contemporary interpretations of preexposure as an event that interferes with subsequent acquisition of a conditioned aversion. An alternative retrieval interference hypothesis was outlined. 相似文献
62.
Roger Baumann 《Journal for the scientific study of religion》2023,62(Z1):48-67
W.E.B. Du Bois was thoroughly ambivalent about the political significance of American Black churches regarding their role in challenging racial inequality. He saw them as integral to Black social life, but also as failing to live up to their potential as drivers of liberation. And, while he focused primarily on Black churches within the United States, Du Bois was also committed to Black liberation on a global level. This suggests great potential for applying DuBois’ analyses of Black religion to the question of transnational religious and racial solidarities and the global political salience of “the Black Church” as a category. In this context, this article explores the significance of DuBois’ work for analyzing the category of “the Black Church.” It does so through a comparative case study of African American Christian engagement with the issue of Israel and Palestine, with four case studies ranging from African American Christian Zionists to Palestinian solidarity activists. Across these cases, the analysis highlights the ways that the history, identity, and mission of “the Black Church” are invoked in the context of Palestine and Israel. It argues that “the Black Church” is best understood as a contested category of collective religious and racial identity. 相似文献
63.
64.
Wolfgang Rautenberg 《Studia Logica》1993,52(1):63-72
It is shown that the class of reduced matrices of a logic is a 1
st
order -class provided the variety associated with has the finite replacement property in the sense of [7]. This applies in particular to all 2-valued logics. For 3-valued logics the class of reduced matrices need not be 1
st
order. 相似文献
65.
Type A behaviour was measured in 250 boys and 245 girls (ages 3-7) using a Swedish version of Matthews' Youth Test for Health (MYTH). In addition, speech and voice characteristics (speed, loudness, response latency) were measured. Each child was independently rated by two play group leaders and measurements were repeated after a six month interval. Interrater reliability (first session) was 0.76 for both sexes and did not change with the age of the child. Boys obtained significantly (p less than 0.0001) higher scores than girls. Correlations over the six month period were 0.64 and 0.60 (p less than 0.001) for the two possible combinations of different raters and slightly higher (0.75 and 0.68, p less than 0.001) when the same rater was used. Two components of Type A behaviour were identified from a factor analysis of the data: impatience and competitiveness, and they accounted for 57% of the total variance. As for the total scale, boys obtained significantly higher scores than girls on both subscales. Scores on the competitiveness scale increased systematically with age. Speech and voice characteristics correlated significantly with Type A scores (total Type A behaviour: r = 0.50, using different raters, and 0.71, using the same raters, p less than 0.001) and, once again, boys obtained significantly (p less than 0.001) higher scores than girls. The results are in close agreement with the American findings from the original scale. It was concluded that the scale provides a reliable and valid instrument for measuring Type A or Type A-like behaviours in pre-school children. 相似文献
66.
Thirty-one families with pre-school children were examined with regard to Type A behaviour and cardiovascular and neuroendocrine measurements. Type A scores (MYTH) of the children from the ages of three to six were positively correlated with independent Type A measurements (Jenkins Activity Survey, Bortner Type A scale) of the parents (significant for fathers but not for mothers). The children's resting systolic blood pressures were significantly correlated with maternal and paternal values, while no significant familial aggregation was found for diastolic blood pressure, heart rate, catecholamine or cortisol excretion. The children's systolic and diastolic blood pressures and adrenaline excretion were significantly correlated between ages three and six. The results are consistent with the assumption that genetic as well as environmental factors contribute to the development of Type A behaviour. No significant association was found between Type A scores and physiological measurements during routine activities in the children or the adults. 相似文献
67.
An adult, with a puppet held at shoulder height on either side (within the infant's visual field), interacted with 3- to-6-month-olds, turning her head intermittently to talk to a puppet. Seventy- three percent of infants' first eye-turns were in the direction of the adult head-turn. 相似文献
68.
A multidisciplinary group of genetic and other professionals discuss a complex case of familial conflict over access to genetic information. One twin wishes to know the results of her deceased mother's tests for BRCA1 mutations; a second twin objects to researchers making this information available. As the case discussion unfolds, the apparent facts of this case are called into question and the lines of ethical certainty become less clear. 相似文献
69.
The cloning of BRCA1, a susceptibility gene for inherited breast cancer, has made genetic screening possible for individuals and families whose medical histories are suggestive of an inherited predisposition to breast cancer. To date, few systematic attempts have been made to determine the level of knowledge about breast cancer genetics among women who are likely to seek BRCA1 screening when it becomes widely available. The present study attempted to assess the general knowledge about BRCA1 mutations in two groups: (1) first-degree relatives (FDRs) of breast cancer patients; and (2) women with a previous diagnosis of breast cancer. A self-administered, thirty-item questionnaire was developed through a pilot study. Ten of the items were objective, factual questions about breast cancer genetics. Responses to these questions were used to generate an overall knowledge score for each respondent. The study population was moderately knowledgeable about breast cancer genetics, with an average score of 5.35 out of 10. Counselors should not underestimate the importance of evaluating each counselee's existing knowledge about breast cancer, which can affect the provision and reception of genetic information. In particular, specific areas of knowledge that may be confusing or misunderstood were identified and these topics are discussed in detail. 相似文献
70.
Relation algebras from cylindric and polyadic algebras 总被引:1,自引:0,他引:1