全文获取类型
收费全文 | 7225篇 |
免费 | 632篇 |
国内免费 | 133篇 |
专业分类
耳鼻咽喉 | 56篇 |
儿科学 | 600篇 |
妇产科学 | 58篇 |
基础医学 | 911篇 |
口腔科学 | 82篇 |
临床医学 | 814篇 |
内科学 | 894篇 |
皮肤病学 | 64篇 |
神经病学 | 845篇 |
特种医学 | 168篇 |
外科学 | 676篇 |
综合类 | 676篇 |
一般理论 | 1篇 |
预防医学 | 1005篇 |
眼科学 | 37篇 |
药学 | 691篇 |
22篇 | |
中国医学 | 221篇 |
肿瘤学 | 169篇 |
出版年
2024年 | 20篇 |
2023年 | 125篇 |
2022年 | 216篇 |
2021年 | 291篇 |
2020年 | 278篇 |
2019年 | 257篇 |
2018年 | 261篇 |
2017年 | 250篇 |
2016年 | 266篇 |
2015年 | 227篇 |
2014年 | 416篇 |
2013年 | 722篇 |
2012年 | 366篇 |
2011年 | 453篇 |
2010年 | 324篇 |
2009年 | 378篇 |
2008年 | 344篇 |
2007年 | 339篇 |
2006年 | 281篇 |
2005年 | 279篇 |
2004年 | 201篇 |
2003年 | 185篇 |
2002年 | 171篇 |
2001年 | 138篇 |
2000年 | 126篇 |
1999年 | 109篇 |
1998年 | 92篇 |
1997年 | 89篇 |
1996年 | 94篇 |
1995年 | 73篇 |
1994年 | 89篇 |
1993年 | 56篇 |
1992年 | 47篇 |
1991年 | 53篇 |
1990年 | 49篇 |
1989年 | 25篇 |
1988年 | 39篇 |
1987年 | 29篇 |
1986年 | 22篇 |
1985年 | 58篇 |
1984年 | 27篇 |
1983年 | 19篇 |
1982年 | 25篇 |
1981年 | 24篇 |
1980年 | 20篇 |
1979年 | 9篇 |
1978年 | 11篇 |
1977年 | 3篇 |
1975年 | 5篇 |
1972年 | 4篇 |
排序方式: 共有7990条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Suyen Karki Eila Laukkanen Helena Länsimies Tomi-Pekka Tuomainen Anna-Maija Pietilä 《Journal of substance use》2019,24(3):300-308
Background: Research has demonstrated that problem behavior has been associated with substance use, but knowledge is lacking on such associations in a low-income country like Nepal. Aims: This study aimed to find associations between emotional and behavioral problems and substance use among Nepalese adolescents. Method: A cross-sectional study was conducted at the end of 2011, with participants from three schools in the Province 4 of Nepal. We selected 408 adolescents aged 12 to 18 (mean 15.2 years, 54% boys) at one urban and two rural schools. The data were collected using the Youth Self-Report and Adolescents’ Substance Use Measurement. Results: Higher scores on withdrawn/depressed symptoms, thought problems, attention problems, delinquent or aggressive behavior or internalizing or externalizing problems were associated with the use of tobacco, alcohol or other substances. In the broadband scales, only internalizing problems predicted the use of intoxicants. Higher scores for attention problems predicted the use of tobacco, any intoxicants, and high-risk user. Conclusion: Our findings indicated that problem behavior among Nepalese adolescents was associated with substance use. Future studies should explore the association between problem behavior and substance use, including causal factors, so that risky behavior among Nepalese adolescents can be prevented. 相似文献
5.
6.
7.
目的调查嘉兴市新居民儿童心理发育行为问题及影响因素,为改善新居民儿童心理健康提供理论依据。方法随机抽取新居民儿童548例,本地儿童1248例,采用自编量表评估儿童家庭影响因素,长处与困难问卷评估儿童心理发育行为问题,心理痛苦温度计评估主观心理痛苦程度,儿童心理虐待与忽视量表评估家庭教养方式,社会支持量表评估社会支持程度。结果新居民儿童主观评定心理痛苦程度高于本地儿童(P=0.002)。新居民儿童亲社会化行为低于本地儿童(P=0.000),多动/注意缺陷问题高于本地儿童(P=0.011)。儿童忽视虐待量表本地儿童5个因子得分低于新居民儿童:责骂因子(P=0.000)、恐吓因子(P=0.000)、情感忽视因子(P=0.000)、教育忽视因子(P=0.000)、身体忽视因子(P=0.000)。社会支持量表本地儿童3个因子得分均高于新居民儿童:客观支持(P=0.032)、主观支持(P=0.000)、对支持的利用度(P=0.000)。新居民儿童在新居民儿童学校、混合学校、本地儿童学校的3类学校中亲社会化行为、忽视因子、虐待因子、社会支持均有统计学差异(均P<0.05)。结论新居民儿童较本地儿童心理发育行为明显落后,良好的家庭教养方式和有效的社会支持系统能够更快更好地促进其身心发育。 相似文献
8.
《Journal of vascular and interventional radiology : JVIR》2020,31(4):635-643
PurposeThis study evaluated the factors affecting contralateral and ipsilateral recurrent deep vein thrombosis (DVT) after iliac vein stent placement in patients with iliac vein compression syndrome (IVCS).Materials and MethodsData from 130 patients (95 female patients) who underwent catheter-directed thrombolysis and stent placement for IVCS with left lower leg thrombosis at a single institution were retrospectively analyzed. Mean patient age was 69.0 ± 14.0 years old. Median follow-up was 14 months (range, 3–164 months). Anticoagulation therapy was prescribed for 6 months, followed by lifelong antiplatelet therapy. Multivariate logistic regression analysis was performed to evaluate the factors affecting the development of contralateral and ipsilateral recurrent DVT.ResultsSeven patients (5.4%) developed contralateral DVT (median, 26 months; range, 2–61 months), and 11 patients (8.5%) developed ipsilateral DVT (median, 1 month; range, 0–53 months). Stent location (odds ratio [OR], 11.564; 95% confidence interval [CI], 1.159–115.417) and in-stent thrombosis during follow-up (OR, 15.142; 95% CI, 1.406–163.119) were predictors of recurrent contralateral DVT. Thrombophilia (OR, 47.560; 95% CI, 2.369–954.711), remaining inferior vena cava filter (OR, 30.552; 95% CI, 3.495–267.122), and in-stent thrombosis during follow-up (OR, 82.057; 95% CI, 2.915–2309.848) were predictors of ipsilateral DVT.ConclusionsContralateral DVT occurs late and is associated with extension of the iliac vein stent to the inferior vena cava and in-stent thrombosis. Ipsilateral DVT occurs relatively early and is associated with thrombophilia, remaining inferior vena cava filter, and in-stent thrombosis. 相似文献
9.
Sibusiso Mdletshe Marcus Oliveira Bhekisipho Twala 《Journal of Medical Imaging and Radiation Sciences》2021,52(2):172-178
Recently, there has been a call for research-informed and research-developed practice in health sciences education. This prompts the consideration of alternative suitable research approaches that could be used to enhance health sciences education practice, including medical radiation sciences education (MRSE) practice. In this discussion paper, the authors uphold design science research (DSR) methodology as a suitable research approach to enhance MRSE practice and research. An overview of the DSR methodology and an example of a project that used DSR methodology are presented to demonstrate the application of this methodology in MRSE practice and research. The paper concludes that the use of DSR methodology could be instrumental in addressing practice related challenges while developing a theoretical contribution to the discipline. 相似文献
10.
Convergent Reliability and Validity of the Questions About Behavioral Function and the Motivation Assessment Scale: A Replication Study 总被引:1,自引:1,他引:0
Karrie A. Shogren Johannes Rojahn 《Journal of developmental and physical disabilities》2003,15(4):367-375
This study compared key psychometric properties of the Motivation Assessment Scale (MAS) and the Questions About Behavioral Function (QABF) and explored their convergent validity. Twenty adults with mental retardation and problem behaviors (aggression, self-injury, or property destruction) and 31 respondents participated. Test–retest reliability of the subscales in both scales was good to excellent (Cicchetti, D. V., 1994, Psychol. Assess. 6: 284–290), and—except for 1 QABF subscale—internal consistency was good considering the small number of items and the purpose of the scale. Consistent with some earlier studies, interrater reliability was less satisfactory with both scales falling only into the fair to good range.Correlations between functionally equivalent subscales were statistically significant and were generally higher than correlations between nonequivalent subscales. The QABF and the MAS were found to be comparable in terms of the assessed reliabilities, and both instruments appear to be measuring very similar constructs. 相似文献