全文获取类型
收费全文 | 31874篇 |
免费 | 3407篇 |
国内免费 | 541篇 |
专业分类
耳鼻咽喉 | 113篇 |
儿科学 | 627篇 |
妇产科学 | 559篇 |
基础医学 | 3033篇 |
口腔科学 | 190篇 |
临床医学 | 4474篇 |
内科学 | 2643篇 |
皮肤病学 | 138篇 |
神经病学 | 10256篇 |
特种医学 | 664篇 |
外科学 | 1268篇 |
综合类 | 3638篇 |
现状与发展 | 2篇 |
一般理论 | 6篇 |
预防医学 | 2473篇 |
眼科学 | 123篇 |
药学 | 2821篇 |
38篇 | |
中国医学 | 1955篇 |
肿瘤学 | 801篇 |
出版年
2024年 | 152篇 |
2023年 | 659篇 |
2022年 | 1000篇 |
2021年 | 1488篇 |
2020年 | 1530篇 |
2019年 | 1405篇 |
2018年 | 1337篇 |
2017年 | 1440篇 |
2016年 | 1458篇 |
2015年 | 1353篇 |
2014年 | 2111篇 |
2013年 | 2784篇 |
2012年 | 1836篇 |
2011年 | 1879篇 |
2010年 | 1606篇 |
2009年 | 1554篇 |
2008年 | 1478篇 |
2007年 | 1439篇 |
2006年 | 1281篇 |
2005年 | 1088篇 |
2004年 | 865篇 |
2003年 | 825篇 |
2002年 | 704篇 |
2001年 | 535篇 |
2000年 | 383篇 |
1999年 | 316篇 |
1998年 | 291篇 |
1997年 | 328篇 |
1996年 | 217篇 |
1995年 | 218篇 |
1994年 | 230篇 |
1993年 | 182篇 |
1992年 | 185篇 |
1991年 | 165篇 |
1990年 | 156篇 |
1989年 | 153篇 |
1988年 | 137篇 |
1987年 | 143篇 |
1986年 | 123篇 |
1985年 | 152篇 |
1984年 | 119篇 |
1983年 | 77篇 |
1982年 | 85篇 |
1981年 | 67篇 |
1980年 | 68篇 |
1979年 | 45篇 |
1978年 | 38篇 |
1977年 | 47篇 |
1976年 | 24篇 |
1975年 | 23篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Objective
The aim of the study was to estimate the effect of the state-based reinsurance programs through the section 1332 State Innovation Waivers on health insurance marketplace premiums and insurer participation.Data Source
2015 to 2022 Robert Wood Johnson Foundation Health Insurance Exchange Compare Datasets.Study Design
An event study difference-in-differences (DD) model separately for each year of implementation and a synthetic control method (SCM) are used to estimate year-by-year effects following program implementation.Data Collection/Extraction Methods
Not applicable.Principal Findings
Reinsurance programs were associated with a decline in premiums in the first year of implementation by 10%–13%, 5%–19%, and 11%–17% for bronze, silver, and gold plans (p < 0.05). There is a trend of sustained declines especially for states that implemented their programs in 2019 and 2020. The SCM analyses suggest some effect heterogeneity across states but also premium declines across most states. There is no evidence that reinsurance programs affected insurer participation.Conclusion
State-based reinsurance programs have the potential to improve the affordability of health insurance coverage. However, reinsurance programs do not appear to have had an effect on insurer participation, highlighting the need for policy makers to consider complementary strategies to encourage insurer participation. 相似文献2.
3.
4.
5.
Louise Danielsson RPT MSc Susanne Rosberg RPT PhD 《Scandinavian journal of caring sciences》2015,29(3):501-509
Although depression is associated to physical discomfort, meanings of the body in depression are rarely addressed in clinical research. Drawing on the concept of the lived body, this study explores depression as an embodied phenomenon. Using a hermeneutic phenomenological approach, the analysis of narrative‐based interviews with 11 depressed adults discloses a thematic structure of an embodied process of an ambiguous striving against fading. Five subthemes elicit different dimensions of this process, interpreted as disabling or enabling: feeling estranged, feeling confined, feeling burdensome, sensing life and seeking belongingness. In relation to clinical practice, we suggest that the interdisciplinary team can focus on enhancing the enabling dimensions, for example through guided physical activities to support the patient to feel more alive, capable and connected. Moreover, we suggest that the treatment process benefits from an increased awareness of the ambiguity in the patient's struggle, acknowledging both destructive and recharging elements of the withdrawing, and the perceived conflict in‐between. 相似文献
6.
目的 探究高龄产妇产后抑郁的影响因素,为护理人员今后在临床工作中提供个性化的护理服务提供参考依据。方法 采用质性研究中的现象学研究法对2021年12月至2022年4月在内蒙古医科大学附属医院妇产科建档分娩的16例高龄产妇进行半结构式访谈,并以Colaizzi现象学研究方法进行资料分析。结果 提炼出影响高龄产妇产后抑郁的4个主题:躯体性压力源;负性心理体验;社会支持缺乏,矛盾出现;角色转变对高龄产妇的影响。结论 需重视高龄产妇产后的主观感受,加强产前产后健康宣教,构建以家庭为中心的高龄产妇产后护理模型,减少产后抑郁的发生。 相似文献
7.
8.
Sho Yagishita 《Psychiatry and clinical neurosciences》2020,74(2):91-98
Pharmacological studies of antidepressants and atypical antipsychotics have suggested a role of dopamine and serotonin signaling in depression. However, depressive symptoms and treatment effects are difficult to explain based simply on brain‐wide decrease or increase in the concentrations of these molecules. Recent animal studies using advanced neuronal manipulation and observation techniques have revealed detailed dopamine and serotonin dynamics that regulate diverse aspects of motivation‐related behavior. Dopamine and serotonin transiently modulate moment‐to‐moment behavior at timescales ranging from sub‐second to minutes and also produce persistent effects, such as reward‐related learning and stress responses that last longer than several days. Transient and sustained effects often exhibit specific roles depending on the projection sites, where distinct synaptic and cellular mechanisms are required to process the neurotransmitters for each transient and sustained timescale. Therefore, it appears that specific aspects of motivation‐related behavior are regulated by distinct synaptic and cellular mechanisms in specific brain regions that underlie the transient and sustained effects of dopamine and serotonin signaling. Recent clinical studies have implied that subjects with depressive symptoms show impaired transient and sustained signaling functions; moreover, they exhibit heterogeneity in depressive symptoms and neuronal dysfunction. Depressive symptoms may be explained by the dysfunction of each transient and sustained signaling mechanism, and distinct patterns of impairment in the relevant mechanisms may explain the heterogeneity of symptoms. Thus, detailed understanding of dopamine and serotonin signaling may provide new insight into depressive symptoms. 相似文献
9.
10.
Christian Holm Hansen Shelley Lees Saidi Kapiga Janet Seeley Tony Barnett 《Global public health》2020,15(3):402-413
ABSTRACTMeasuring hope reliably and accurately remains an important research objective, not least in less prosperous settings where ‘holding on to hope’ may be critically important in the struggle against adverse life conditions. The State Hope Scale was designed for use in the US. Despite reported application in diverse cultures and using translations the scale has not been extensively validated outside US populations. This study contributes to a larger project exploring the measurement of hope and provides a critique of Snyder’s scale as used in a Tanzanian female population of 1021 urban microfinance participants. We evaluate the scale’s validity through assessment of the empirical distribution of scores, item response profiles, internal consistency and discriminatory ability. Participants mostly scored very high and many reached very near the maximum attainable score. Hardly any endorsed the negative half of the response scale. Several problems are discussed including poor discrimination and strong evidence of acquiescence response bias. We also found little association of the scale scores with hypothesised correlates of hope. Future improvements on the measurement of hope are recommended, especially in studies outside the narrow Western context in which the scale was devised. 相似文献