全文获取类型
收费全文 | 2108篇 |
免费 | 29篇 |
国内免费 | 1篇 |
专业分类
教育 | 1534篇 |
科学研究 | 282篇 |
各国文化 | 20篇 |
体育 | 49篇 |
综合类 | 1篇 |
文化理论 | 10篇 |
信息传播 | 242篇 |
出版年
2023年 | 12篇 |
2022年 | 16篇 |
2021年 | 33篇 |
2020年 | 31篇 |
2019年 | 45篇 |
2018年 | 76篇 |
2017年 | 69篇 |
2016年 | 81篇 |
2015年 | 54篇 |
2014年 | 73篇 |
2013年 | 415篇 |
2012年 | 56篇 |
2011年 | 60篇 |
2010年 | 55篇 |
2009年 | 60篇 |
2008年 | 64篇 |
2007年 | 57篇 |
2006年 | 69篇 |
2005年 | 54篇 |
2004年 | 44篇 |
2003年 | 45篇 |
2002年 | 30篇 |
2001年 | 35篇 |
2000年 | 36篇 |
1999年 | 24篇 |
1998年 | 23篇 |
1997年 | 30篇 |
1996年 | 25篇 |
1995年 | 28篇 |
1994年 | 22篇 |
1993年 | 35篇 |
1992年 | 29篇 |
1991年 | 29篇 |
1990年 | 25篇 |
1989年 | 20篇 |
1988年 | 21篇 |
1987年 | 23篇 |
1986年 | 16篇 |
1985年 | 18篇 |
1984年 | 15篇 |
1983年 | 15篇 |
1982年 | 17篇 |
1981年 | 18篇 |
1980年 | 17篇 |
1979年 | 11篇 |
1978年 | 8篇 |
1977年 | 12篇 |
1976年 | 14篇 |
1974年 | 7篇 |
1972年 | 8篇 |
排序方式: 共有2138条查询结果,搜索用时 593 毫秒
81.
82.
83.
Suparna Dhara Anindya Dasgupta Jayanta Kumar Rout Ushasi Banerjee Sayantan Dasgupta Arindam Ghosh 《Indian journal of clinical biochemistry : IJCB》2015,30(1):99-103
Psoriasis is a chronic inflammatory disease associated with an increased insulin resistance, obesity and cardiovascular risk. The present study was aimed to assess insulin resistance and pattern of body fat deposition in psoriasis. Body mass index (BMI) and waist circumference (WC) were measured in 40 psoriatic patients and 46 age- and sex-matched control subjects. Fasting blood glucose (FBG) and serum insulin level were measured by standard photometric method and ELISA respectively. HOMA-IR (homeostatic model of insulin resistance) was calculated by appropriate software. The results indicated that case and control groups were comparable in terms of age and sex (p = 0.934) with an increased prevalence of psoriasis among male subjects (60 %). FBG and mean WC between the two groups were statistically not significant (p value = 0.271 and 0.21 respectively). BMI was significantly higher in case group compared to the control group (p = 0.049). Serum insulin level and insulin resistance in the psoriatic patients were significantly higher (p value <0.001). Multiple regression analysis revealed that insulin resistance (measured by HOMA) was dependent on BMI and WC at a significance level of p < 0.001 and 0.043 respectively. Therefore, the psoriatic patients in this region have significantly high amount of fasting serum insulin level along with an increased IR though their FBG level remains normal. Furthermore, these abnormalities are significantly dependent on total body fat as well as abdominal fat deposits. We suggest that psoriatic patients need to be evaluated for metabolic syndrome and managed accordingly. 相似文献
84.
R. Dhananjayan T. Malati Y. Rupasree Vijay Kumar Kutala 《Indian journal of clinical biochemistry : IJCB》2015,30(3):263-270
The present work was aimed to study the association of one carbon genetic variants, hyperhomocysteinemia and oxidative stress markers, i.e., serum nitrite, plasma malondialdehyde (MDA) and glutathione (GSH) on intimal medial thickening (IMT) in patients with type 2 diabetes mellitus (T2D). A total number of 76 subjects from ACS Medical College and Hospital, Chennai, India were included in the study, i.e., Group I (n = 42) of T2D and Group II (n = 34) of age- and sex matched healthy controls. The glycated haemoglobin was measured by ion-exchange resin method; plasma homocysteine by Enzyme Linked Immunosorbant Assay method; serum nitrite (nitric oxide, NO), plasma MDA and GSH by spectrophotometric methods; the IMT by high frequency ultrasound. The polymorphisms of one carbon genetic variants were genotyped using polymerase chain reaction-restriction fragment length polymorphism and amplified fragment length polymorphism methods. Results indicate that methyltetrahydrofolate homocysteine methyl transferase (MTR) A2756G allele was found to be protective in T2D and the other variants were not significantly associated with T2D. Glutamate carboxypeptidase II (GCP II) C1561T (r = 0.34; p = 0.05) and methylene tetrahydrofolate reductase (MTHFR) C677T (r = 0.35; 0.04) showed positive correlation with plasma homocysteine in T2D cases. In this study, MTR A2756G allele was found to be protective in T2D; GCP II C1561T and MTHFR C677T showed positive association with plasma homocysteine in T2D cases. Among all the genetic variants, MTR A2756G was found influence IMT. RFC 1 G80A and TYMS 5′-UTR 2R3R showed synergistically interact with MTR A2756G in influencing increase in IMT. 相似文献
85.
Margaret WINKER 《Learned Publishing》2015,28(2):143-145
- Post‐publication peer review (PPPR) has not achieved its promise and potential.
- Few articles receive PPPR – even those in high‐profile journals.
- PPPR is difficult to find and needs to be linked to the original article.
- Academics require recognition if they are to contribute their time to PPPR.
- Improving PPPR would improve the scholarly corpus.
86.
Margaret Moylan Bandy 《Journal of the Medical Library Association》2015,103(1):3-13
Purpose:
The purpose of this lecture is to challenge librarians in clinical settings to leverage the opportunities presented by the current health care environment and to develop collaborative relationships with health care practitioners to provide relevant services.Discussion:
Health care organizations are under financial and regulatory pressures, and many hospital librarians have been downsized or have had their positions eliminated. The lecture briefly reviews hospital librarians'' roles in the past but focuses primarily on our current challenges. This environment requires librarians to be opportunity focused and pivot to a new vision that directs their actions. Many librarians are already doing this, and colleagues are encouraging us to embrace these opportunities. Evidence from publications, websites, discussion lists, personal communications, and the author''s experience is explored.Conclusion:
Developing interdisciplinary and collaborative relationships in our institutions and providing relevant services will mark our progress as vital, contributing members of our health care organizations. 相似文献87.
88.
89.
Ashley Lewis Presser Margaret Clements Herbert Ginsburg Barbrina Ertle 《Early education and development》2015,26(3):399-426
Research Findings: Big Math for Little Kids (BMLK) is a mathematics curriculum developed for use with 4- and 5-year-old children. To investigate the BMLK curriculum's effect on children's mathematics knowledge, this cluster-randomized controlled trial randomly assigned child care centers to provide mathematics instruction to children, using either the BMLK mathematics curriculum or the centers’ business-as-usual curriculum, over a 2-year period when children were in prekindergarten and kindergarten. Participants in the study were 762 children and their teachers at 16 publicly subsidized child care centers. The study assessed children's mathematics knowledge using the Early Childhood Longitudinal Study, Birth Cohort (ECLS-B), Direct Mathematics Assessment, a measure of young children's mathematics knowledge that is not aligned with the curriculum. The ECLS-B scores of children in the BMLK group increased significantly more than did those of children in the comparison group. The study also included exploratory analyses to examine whether children in the BMLK group demonstrated evidence of improved mathematical language. Practice or Policy: These results indicate that the BMLK curriculum, which is designed to help teachers use play-based, developmentally appropriate mathematics instruction, has a positive impact on young children's mathematics knowledge as measured by a general mathematics assessment that is not aligned with the curriculum. 相似文献
90.
Margaret Gearty 《Action Learning: Research and Practice》2015,12(2):146-165
This paper explores the combination of storytelling and reflective action research as a means to effect change and learning within and across communities and organizations. Taking the complex challenge of ‘pro-environmental behaviour change’ as an example, the paper reflects on the experiences of a pilot project run for the UK government that took place over two years with five community groups in rural England. The research question centred on how the stories of ‘older’ (aged 50+) community advocates might be amplified and inspire wider change via a systemic action research approach. This paper describes the project and shares insights into how behaviour change might occur in this action-based learning context challenging more Newtonian conceptualizations of change. Some of the methodological and practice challenges and conundrums that arose are discussed including authenticity, ownership and ethical issues of voice and ownership. Parallels and distinctions between story-based action research and action learning are identified and the role of narrative in inducing action is considered. The paper concludes by reflecting on future directions and the overall potential there is for ‘narrative action learning’ to address those wicked systemic problems that transcend organizational boundaries and that are faced by real people in our communities and society as a whole. 相似文献