首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   9134篇
  免费   107篇
  国内免费   18篇
教育   6161篇
科学研究   1036篇
各国文化   90篇
体育   992篇
综合类   6篇
文化理论   96篇
信息传播   878篇
  2021年   69篇
  2020年   122篇
  2019年   175篇
  2018年   237篇
  2017年   252篇
  2016年   218篇
  2015年   153篇
  2014年   216篇
  2013年   1689篇
  2012年   199篇
  2011年   196篇
  2010年   169篇
  2009年   152篇
  2008年   169篇
  2007年   193篇
  2006年   160篇
  2005年   150篇
  2004年   141篇
  2003年   168篇
  2002年   138篇
  2001年   157篇
  2000年   157篇
  1999年   155篇
  1998年   72篇
  1997年   74篇
  1996年   109篇
  1995年   77篇
  1994年   95篇
  1993年   87篇
  1992年   153篇
  1991年   146篇
  1990年   137篇
  1989年   136篇
  1988年   114篇
  1987年   116篇
  1986年   138篇
  1985年   134篇
  1984年   107篇
  1983年   129篇
  1982年   110篇
  1981年   97篇
  1980年   80篇
  1979年   154篇
  1978年   103篇
  1977年   93篇
  1976年   97篇
  1975年   68篇
  1974年   86篇
  1972年   68篇
  1971年   64篇
排序方式: 共有9259条查询结果,搜索用时 15 毫秒
941.
942.
943.
This study investigated counseling-orientation preferences of samples of counselor trainees in the United States and Australia using the Counseling-Orientation Scale. The authors compare the preferences in theoretical orientations and discuss the two major findings primarily in terms of the cultural characteristics of the two nations.  相似文献   
944.
In this study of deaf college students' performance solving compare word problems, relational statements were either consistent or inconsistent with the arithmetic operation required for the solutions. The results support the consistency hypothesis Lewis and Mayer (1987) proposed based on research with hearing students. That is, deaf students were more likely to miscomprehend a relational statement and commit a reversal error when the required arithmetic operation was inconsistent with the statement's relational term (e.g., having to add when the relational term was less than). Also, the reversal error effect with inconsistent word problems was magnified when the relational statement was a marked term (e.g., a negative adjective such as less than) rather than an unmarked term (e.g., a positive adjective such as more than). Reading ability levels of deaf students influenced their performance in a number of ways. As predicted, there was a decrease in goal-monitoring errors, multiple errors, and the number of problems left blank as the reading levels of students increased. Contrary to expectations, higher reading skills did not affect the frequency of reversal errors.  相似文献   
945.
946.
947.
948.
    
Objective To investigate molecular alterations associating with prostate carcinoma progression and potentially provide information toward more accurate prognosis/diagnosis. Methods A set of laser captured microdissected (LCM) specimens from 300 prostate cancer (PCa) patients undergoing radical prostatectomy (RP) were defined. Ten patients representing “aggressive” PCa, and 10 representing “non-aggressive” PCa were selected based on prostate-specific antigen (PSA) recurrence, Gleason score, pathological stage and tumor cell differentiation, with matched patient age and race between the two groups. Normal and neoplastic prostate epithelial cells were collected with LCM from frozen tissue slides obtained from the RP specimens. The expressions of a panel of genes, including NPY, PTEN, AR, AMACR, DD3, and GSTP1, were measured by quantitative real-time RT-PCR (TaqMan), and correlation was analyzed with clinicopathological features. Results The expressions of AMACR and DD3 were consistently up-regulated in cancer cells compared to benign prostate epithelial cells in all PCa patients, whereas GSTP1 expression was down regulated in each patient. NPY, PTEN and AR exhibited a striking difference in their expression patterns between aggressive and non-aggressive PCas (P=0.0203, 0.0284, and 0.0378, respectively, Wilcoxon rank sum test). The lower expression of NPY showed association with “aggressive” PCas based on a larger PCa patient cohort analysis (P=0.0037, univariate generalized linear model (GLM) analysis). Conclusion Despite widely noted heterogeneous nature of PCa, gene expression alterations of AMACR, DD3, and GSTP1 in LCM-derived PCa epithelial cells suggest for common underlying mechanisms in the initiation of PCa. Lower NPY expression level is significantly associated with more aggressive clinical behavior of PCa; PTEN and AR may have potential in defining PCa with aggressive clinical behavior. Studies along these lines have potential to define PCa-associated gene expression alterations and likely co-regulation of genes/pathways critical in the biology of PCa onset/progression. Project supported by the Center for Prostate Disease Research, and the Henry M. Jackson Foundation for the Advancement of Military Medicine, Rockville, MD, USA  相似文献   
949.
Several reasons for the modest relation between interest congruence and occupational outcomes are discussed, but focus is placed on possible moderators of this relation. Specifically individual differences, environmental differences and time are proposed as potential moderators. Overall, it is important to investigate theoretically driven moderators of the congruence-outcome relation to further our knowledge of this area.  相似文献   
950.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号