全文获取类型
收费全文 | 9255篇 |
免费 | 103篇 |
国内免费 | 6篇 |
专业分类
教育 | 6170篇 |
科学研究 | 1095篇 |
各国文化 | 322篇 |
体育 | 713篇 |
综合类 | 4篇 |
文化理论 | 65篇 |
信息传播 | 995篇 |
出版年
2021年 | 85篇 |
2020年 | 121篇 |
2019年 | 172篇 |
2018年 | 214篇 |
2017年 | 236篇 |
2016年 | 214篇 |
2015年 | 143篇 |
2014年 | 179篇 |
2013年 | 1607篇 |
2012年 | 191篇 |
2011年 | 190篇 |
2010年 | 169篇 |
2009年 | 172篇 |
2008年 | 229篇 |
2007年 | 209篇 |
2006年 | 177篇 |
2005年 | 165篇 |
2004年 | 181篇 |
2003年 | 121篇 |
2002年 | 111篇 |
2001年 | 152篇 |
2000年 | 181篇 |
1999年 | 158篇 |
1998年 | 86篇 |
1997年 | 85篇 |
1996年 | 75篇 |
1994年 | 67篇 |
1993年 | 82篇 |
1992年 | 138篇 |
1991年 | 148篇 |
1990年 | 148篇 |
1989年 | 157篇 |
1988年 | 122篇 |
1987年 | 117篇 |
1986年 | 116篇 |
1985年 | 156篇 |
1984年 | 128篇 |
1983年 | 119篇 |
1982年 | 100篇 |
1981年 | 80篇 |
1980年 | 90篇 |
1979年 | 142篇 |
1978年 | 88篇 |
1977年 | 91篇 |
1976年 | 80篇 |
1975年 | 76篇 |
1974年 | 88篇 |
1973年 | 81篇 |
1971年 | 77篇 |
1968年 | 74篇 |
排序方式: 共有9364条查询结果,搜索用时 0 毫秒
31.
Critical communication pedagogy and service learning in a mixed-method communication research course
ABSTRACTCourse: Mixed-Method Communication Research MethodsObjective: The purpose of this semester-long activity is to provide students with opportunities to cultivate mixed-method communication research skills through a social justice-informed service-learning format. Completing this course, students will be able to: recognize the unique strengths of quantitative and qualitative research methods; locate, evaluate, and utilize scholarly literature for a literature review; conduct an original research project using quantitative and qualitative research methods to gather and analyze data; and raise self and community awareness about a social issue through collaboration with a community organization. 相似文献
32.
Sridhar Mishra Devanshi B. Dubey Krachi Agarwal Deval B. Dubey Shweta Verma Nida Shabbir Rashmi Kushwaha D Himanshu Reddy Uma Shankar Singh Wahid Ali 《Indian journal of clinical biochemistry : IJCB》2023,38(2):172
Lymphocyte dysregulation in coronavirus disease-19 (COVID-19) is a major contributing factor linked to disease severity and mortality. Apoptosis results in the accumulation of cell-free DNA (cfDNA) in circulation. COVID-19 has a heterogeneous clinical course. The role of cfDNA levels was studied to assess the severity and outcome of COVID-19 patients and correlated with other laboratory parameters. The current case series included 100 patients with mild COVID-19 (MCOV-19) and 106 patients with severe COVID-19 (SCOV-19). Plasma cfDNA levels were quantified using SYBR green quantitative real-time PCR through amplification of the β-actin gene. CfDNA level was significantly higher in SCOV-19 at 706.7 ng/ml (522.6–1258) as compared to MCOV-19 at 219.8 ng/ml (167.7–299.6). The cfDNA levels were significantly higher in non-survivor than in survivors (p = 0.0001). CfDNA showed a significant correlation with NLR, ferritin, LDH, procalcitonin, and IL-6. The diagnostic sensitivity and specificity of cfDNA in the discrimination of SCOV-19 from MCOV-19 were 90.57% & 80%, respectively. CfDNA showed a sensitivity of 94.74% in the differentiation of non-survivors from survivors. CfDNA levels showed a significant positive correlation with other laboratory and inflammatory markers of COVID-19. CfDNA levels, NLR, and other parameters may be used to stratify and monitor COVID-19 patients and predict mortality. CfDNA may be used to predict COVID-19 severity with higher diagnostic sensitivity. 相似文献
33.
34.
35.
36.
37.
38.
39.
40.