全文获取类型
收费全文 | 2421篇 |
免费 | 257篇 |
出版年
2024年 | 5篇 |
2023年 | 37篇 |
2022年 | 10篇 |
2021年 | 12篇 |
2020年 | 119篇 |
2019年 | 39篇 |
2018年 | 35篇 |
2017年 | 117篇 |
2016年 | 114篇 |
2015年 | 90篇 |
2014年 | 98篇 |
2013年 | 455篇 |
2012年 | 104篇 |
2011年 | 79篇 |
2010年 | 85篇 |
2009年 | 92篇 |
2008年 | 73篇 |
2007年 | 54篇 |
2006年 | 81篇 |
2005年 | 57篇 |
2004年 | 43篇 |
2003年 | 54篇 |
2002年 | 43篇 |
2001年 | 24篇 |
2000年 | 40篇 |
1999年 | 32篇 |
1998年 | 32篇 |
1997年 | 22篇 |
1996年 | 53篇 |
1995年 | 45篇 |
1994年 | 39篇 |
1993年 | 40篇 |
1992年 | 42篇 |
1991年 | 58篇 |
1990年 | 41篇 |
1989年 | 34篇 |
1988年 | 23篇 |
1987年 | 20篇 |
1986年 | 20篇 |
1985年 | 10篇 |
1984年 | 13篇 |
1983年 | 17篇 |
1982年 | 21篇 |
1981年 | 17篇 |
1980年 | 19篇 |
1979年 | 27篇 |
1978年 | 29篇 |
1977年 | 27篇 |
1976年 | 12篇 |
1975年 | 8篇 |
排序方式: 共有2678条查询结果,搜索用时 15 毫秒
881.
Radzikowski C 《Science and engineering ethics》2006,12(1):103-110
The use of experimental animals, mostly rodents, in biomedical research and especially in oncology and immunology should be
acknowledged with respect, recognizing the contribution of animal experimentation in the fascinating scientific progress in
these disciplines of research. It is an obligation of the investigator to justify the scientific and ethical aspects of each
study requiring the use of animals. The international guiding principles for using animals in biomedical research are well
defined and have been distributed worldwide by the International Council for Laboratory Animal Science (ICLAS) since 1956,
when this Organization was founded. In Poland the ICLAS philosophy and principles are highly respected and were implemented
firstly by the members of the Commission on Biology of Experimental Animals appointed in 1962 by the Department of Medical
Science of the Polish Academy of Science in Warsaw. Animal Protection Acts, first proclaimed in 1928 were gradually modified
and improved. Actual legislation (enacted in 1997, 2003 and 2005) is consistent with EU Directives (86/609/EEC) and follows
the internationally recommended principles that include ICLAS guidelines concerning animal welfare and care condition in biomedical
research. The problem of “alternative methods” is briefly discussed.
Dr. Donald Boisvert, CCAC — Canadian Council on Animal Care
A lecture on the subject of this paper was presented at the 6th International Bioethics Conference entitled ‘The Responsible
Conduct of Basic and Clinical Research’, held in Warsaw, Poland, 3–4 June 2005.
The author is the National Representative of Polish Academy of Science to the International Council for Laboratory Animal
Science (ICLAS) and a Member of the ICLAS Governing Board. 相似文献
882.
883.
Rapkin BD Massie MJ Jansky EJ Lounsbury DW Murphy PD Powell S 《American journal of community psychology》2006,38(3-4):153-164
There is growing enthusiasm for community-academic partnerships to promote health in underserved communities. Drawing upon resources available at a comprehensive cancer center, we developed the ACCESS program to guide community based organizations through a flexible program planning process. Over a three-year period, ACCESS partnered with 67 agencies serving various medically underserved populations. Organizations included hospitals, parishes, senior centers, harm reduction programs, and recreational facilities. Program outcomes at the organizational level were quantified in terms of introduction of new cancer information, referral or screening programs, as well as organizational capacity building. ACCESS represents a viable model for promoting partnership to transfer behavioral health programs and adapt interventions for new audiences. Plans to further evaluate and enhance this model to promote cancer screening efforts are discussed. We argue that, ultimately, formation and development of community partnerships need to be understood as a fundamental area of practice that must be systematically integrated into the mission of major academic medical institutions in every area of public health. 相似文献
884.
Story Recall and Narrative Coherence of High-Functioning Children with Autism Spectrum Disorders 总被引:5,自引:0,他引:5
Previous research has found few quantitative differences between children with high-functioning autism spectrum disorders (ASDs) and well-matched controls in the length, complexity, and structure of their narratives. Researchers have noted, however, that narratives of children with ASDs have an unusual and idiosyncratic nature. This study provides an analysis of narratives in 17 children with high-functioning ASDs and 17 typically developing children matched on age, gender, language abilities, and cognitive abilities. We examined story recall and narrative coherence. The study revealed no group differences in story length or syntactic complexity. Children with ASDs also did not differ from controls in their use of the gist of a story to aid recall, or in their sensitivity to the importance of story events. Children with ASDs did, however, produce narratives that were significantly less coherent than the narratives of controls. Children with ASDs appeared less likely to use the gist of the story to organize their narratives coherently. These findings are discussed with regard to their relationship to other cognitive and linguistic difficulties of children with ASDs. 相似文献
885.
Pizzolato JE 《Cultural diversity & ethnic minority psychology》2006,12(1):57-69
This study explores the possible-self construction and achievement process in students of color from low-income communities by investigating these processes in 28 college students. Findings suggest that while parental encouragement of college aspirations may affect age at which the college student possible self is constructed and expectancy level, development of schematic possible selves is more crucial to achievement of possible-self goals. Furthermore, findings point out a need to include conceptual schemas, in addition to procedural schemas, as potential predictors of possible-self achievement. 相似文献
886.
Eisen JL Coles ME Shea MT Pagano ME Stout RL Yen S Grilo CM Rasmussen SA 《Journal of personality disorders》2006,20(3):294-305
In this study we examined the convergence between obsessive-compulsive personality disorder (OCPD) criteria and obsessive-compulsive disorder (OCD). Baseline assessments of 629 participants of the Collaborative Longitudinal Personality Disorders Study were used to examine the associations between OCPD criteria and diagnoses of OCD. Three of the eight OCPD criteria--hoarding, perfectionism, and preoccupation with details--were significantly more frequent in subjects with OCD (n = 89) than in subjects without OCD (n = 540). Logistic regressions were used to predict the probability of each OCPD criterion as a function of Axis I diagnoses (OCD, additional anxiety disorders, and major depressive disorder). Associations between OCD and these three OCPD criteria remained significant in the logistic regressions, showing unique associations with OCD and odds ratios ranging from 2.71 to 2.99. In addition, other anxiety disorders and major depressive disorder showed few associations with specific OCPD criteria. This study suggests variability in the strength of the relationships between specific OCPD criteria and OCD. The findings also support a unique relationship between OCPD symptoms and OCD, compared to other anxiety disorders or major depression. Future efforts to explore the link between Axis I and Axis II disorders may be enriched by conducting analyses at the symptom level. 相似文献
887.
How is attention allocated during face identification? Previous work using famous and unfamiliar faces suggests that either no attention or a special attentional mechanism is required. We used a conventional attentional blink (AB) procedure to measure face identification with temporarily reduced attention. The participants viewed a rapid series of face images with one embedded nonface abstract pattern (T1). They judged the texture of T1 and then detected a prespecified face (T2) presented at varying lags after T1. T2 was either famous or unfamiliar, as were distractor faces. Regardless of distractor type, detection of an unfamiliar T2 face was significantly impaired at short versus long T1-T2 lags, indicating an attentional requirement for face identification. Detection of a famous T2 face was unaffected by lag, suggesting that familiarity protects against atemporal attentional bottleneck These findings do not support propositions that face identification is "special" in its need for attentional control 相似文献
888.
The employment rate for mothers with young children has increased dramatically over the past 25 years. Estimating the effects of maternal employment on children's development is challenged by selection bias and the missing data endemic to most policy research. To address these issues, this study uses propensity score matching and multiple imputation. The authors compare outcomes across 4 maternal employment patterns: no work in first 3 years postbirth, work only after 1st year, part-time work in 1st year, and full-time work in 1st year. Our results demonstrate small but significant negative effects of maternal employment on children's cognitive outcomes for full-time employment in the 1st year postbirth as compared with employment postponed until after the 1st year. Multiple imputation yields noticeably different estimates as compared with a complete case approach for many measures. Differences between results from propensity score approaches and regression modeling are often minimal. 相似文献
889.
The authors used the Fagan Test of Infant Intelligence (J. F. Fagan, L. T. Singer, J. E. Montie, & P. A. Shepherd, 1986) to examine preferences for novelty and to evaluate several indicators of attention (off- and on-task indexes and durations) in 6- and 9-month-old infants who had been prenatally exposed to cigarette smoke only or to cocaine plus other substances. The infants were matched for socioeconomic status. The authors found no group differences in preference for novelty, but the off-task distractibility index and duration were affected by exposure history and showed effects of dosage at the 9-month test time. Infants exposed to cocaine had a higher off-task index and a shorter average off-task look duration than did infants in the other groups. The authors interpreted this pattern of behavior as an indicator of distractibility or stimulation seeking. There were no group differences in measures involving on-task looks or duration at either test time. Correlations between the off-task look index and duration and teratogen use produced moderate correlations at 9 months of age. The authors calculated partial correlations between teratogen exposure and the off-task index at each trimester. Cocaine use during the 1st and 2nd trimesters was significantly correlated with the off-task index at 9 months of age, even when the authors controlled for neonatal measures (e.g., gestational age, birth weight) and during the 1st trimester when they controlled for alcohol and cigarette exposure. 相似文献
890.
This study examined the relationship between participants' physique anxiety, eating behaviors, somatotype, and the preferred qualifications and body type of a fitness instructor. Subjects were 171 students attending fitness classes at a university. Analysis indicated that the women preferred a thinner fitness instructor than men and that enthusiasm, motivation, and being physically fit were considered the most important characteristics overall. No significant racial differences in key variables were found. 相似文献