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   16991篇
  免费   1406篇
  国内免费   36篇
耳鼻咽喉   195篇
儿科学   666篇
妇产科学   509篇
基础医学   2206篇
口腔科学   419篇
临床医学   2498篇
内科学   2989篇
皮肤病学   243篇
神经病学   1621篇
特种医学   462篇
外国民族医学   2篇
外科学   1406篇
综合类   210篇
一般理论   19篇
预防医学   2404篇
眼科学   296篇
药学   1118篇
中国医学   12篇
肿瘤学   1158篇
  2023年   172篇
  2022年   232篇
  2021年   424篇
  2020年   323篇
  2019年   494篇
  2018年   500篇
  2017年   447篇
  2016年   411篇
  2015年   464篇
  2014年   585篇
  2013年   872篇
  2012年   1182篇
  2011年   1200篇
  2010年   671篇
  2009年   559篇
  2008年   994篇
  2007年   1066篇
  2006年   969篇
  2005年   877篇
  2004年   813篇
  2003年   794篇
  2002年   754篇
  2001年   250篇
  2000年   186篇
  1999年   224篇
  1998年   159篇
  1997年   108篇
  1996年   118篇
  1995年   99篇
  1994年   114篇
  1993年   72篇
  1992年   129篇
  1991年   134篇
  1990年   102篇
  1989年   133篇
  1988年   118篇
  1987年   128篇
  1986年   112篇
  1985年   116篇
  1984年   83篇
  1983年   76篇
  1982年   81篇
  1981年   54篇
  1980年   55篇
  1979年   72篇
  1978年   70篇
  1977年   59篇
  1976年   68篇
  1975年   55篇
  1974年   50篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Anger is an important dimension of affect and a prominent feature of posttraumatic mental health, but it is commonly overlooked in postdisaster settings. We aimed to examine the distribution and implications of significant anger problems in the aftermath of a natural disaster, via analyses of Beyond Bushfires survey data from 736 residents of rural communities 5 years after the 2009 Black Saturday bushfires in Victoria, Australia. Assessments included the five‐item Dimensions of Anger Reaction (DAR‐5) scale along with measures of PTSD, depression, and significant mental illness, and indicators of life satisfaction, suicidality, hostile aggressive behavior, and violence exposure. The results indicated that approximately 10% of respondents from areas highly affected by the bushfires scored above the provisional cutoff criteria for significant anger problems on the DAR‐5, which was a more than 3‐fold increase, OR = 3.26, relative to respondents from areas of low‐to‐moderate bushfire impact. The rates were higher among women, younger participants, and those who were unemployed, and co‐occurred commonly, although not exclusively, with other postdisaster mental health problems. Anger problems were also associated with lower life satisfaction, β = ?.31, an 8‐fold increase in suicidal ideation, OR = 8.68, and a nearly 13‐fold increase in hostile aggressive behavior, OR = 12.98. There were associations with anger problems and violence exposure, which were reduced when controlling for covariates, including probable PTSD. The findings provide evidence indicating that anger is a significant issue for postdisaster mental health and should be considered routinely alongside other posttraumatic mental health issues.  相似文献   
102.
103.

Endometriosis affects women of reproductive age and is associated with higher levels of sexual and relational distress. Despite the relational context of endometriosis, the research pertaining to dyadic relationship goals is lacking. An exploration of the relationship goals of couples coping with endometriosis can facilitate the understanding of potential protective mechanisms that mitigate the relational components of the condition. Guided by the approach-avoidance theoretical framework, the current cross-sectional study aimed to examine the role relationship goals play in sexual and relationship satisfaction in couples coping with endometriosis. Approach goals relate to the pursuit of a positive outcomes, whereas avoidance goals relate to the avoidance of negative outcomes. Women with endometriosis and their partners (N?=?61) completed an online survey measuring relationship goals and relationship and sexual satisfaction. The study results indicated that, for women, their own and their partner’s higher relationship approach goals were linked to higher sexual satisfaction. For partners of women with endometriosis, their own higher relationship approach goals were associated with their own higher relationship satisfaction. Higher relationship avoidance goals in both women with endometriosis and partners were associated with higher relationship satisfaction. The study’s findings highlight relationship goals as relevant to the relational and sexual experience of couples coping with endometriosis. When treating women with endometriosis, the inclusion of partners and consideration of factors beyond the physical illness are important for a holistic management approach.

  相似文献   
104.
BackgroundThis paper compares cost-effectiveness results from two models of maternal immunization to prevent pertussis in infants in Brazil, one static, one dynamic, to explore when static models are adequate for public health decisions and when the extra effort required by dynamic models is worthwhile.MethodsWe defined two scenarios to explore key differences between static and dynamic models, herd immunity and time horizon. Scenario 1 evaluates the incremental cost/DALY of maternal acellular pertussis (aP) immunization as routine infant vaccination coverage ranges from low/moderate up to, and above, the threshold at which herd immunity begins to eliminate pertussis. Scenario 2 compares cost-effectiveness estimates over the models’ different time horizons. Maternal vaccine prices of $9.55/dose (base case) and $1/dose were evaluated.ResultsThe dynamic model shows that maternal immunization could be cost-saving as well as life-saving at low levels of infant vaccination coverage. When infant coverage reaches the threshold range (90–95%), it is expensive: the dynamic model estimates that maternal immunization costs $2 million/DALY at infant coverage > 95% and maternal vaccine price of $9.55/dose; at $1/dose, cost/DALY is $200,000. By contrast, the static model estimates costs/DALY only modestly higher at high than at low infant coverage. When the models’ estimates over their different time horizons are compared at infant coverage < 90–95%, their projections fall in the same range.ConclusionsStatic models may serve to explore an intervention’s cost-effectiveness against infectious disease: the direction and principal drivers of change were the same in both models. When, however, an intervention too small to have significant herd immunity effects itself, such as maternal aP immunization, takes place against a background of vaccination in the rest of the population, a dynamic model is crucial to accurate estimates of cost-effectiveness. This finding is particularly important in the context of widely varying routine infant vaccination rates globally.Clinical Trial registryClinical Trial registry name and registration number: Not applicable.  相似文献   
105.
106.
107.
The aim of this study is to propose a model of the benefits and working mechanisms of family nursing conversations in home healthcare from the perspective of participating patients and their family members. Family nursing conversations in this study are intended to optimise family functioning, improve collaboration between family and professional caregivers and ultimately prevent or reduce overburden of family caregivers. In a qualitative grounded theory design, data were collected in 2017 using intensive interviewing with participants of family nursing conversations in home healthcare. A total of 26 participants (9 patients and 17 family members) from 11 families participated in a family nursing conversation and the study. Seven nurses who received extensive education in family nursing conversations conducted them as part of their daily practice. Interviews occurred 4–6 weeks after the family nursing conversation. The model that was constructed in close collaboration with the families consists of three parts. The first part outlines working mechanisms of the conversation itself according to participants, i.e. structured and open communication about the care situation and the presence of all of the people who are involved. The second part consists of the benefits that participants experienced during and immediately after the conversation – an increased sense of overview and improved contact among the people involved – and the related working mechanisms. The last part consists of benefits that emerged in the weeks after the conversation – reduced caregiver burden and improved quality of care – and the related working mechanisms. Insight into the benefits and working mechanisms of family nursing conversations may assist healthcare professionals in their application of the intervention and provides directions for outcomes and processes to include in future studies.  相似文献   
108.
Although literature on postdiagnostic support for people affected by young onset dementia acknowledges financial concerns, this topic has remained underresearched. The aim of this study was to explore the financial impact of a diagnosis of young onset dementia on individuals and families. An online survey, comprising binary yes/no, multiple-response and open-ended questions, was codesigned with people living with young onset dementia. The survey was promoted via networks and online platforms. Data were collected from August to October 2019. Survey respondents across the United Kingdom (n = 55) who had received a diagnosis of young onset dementia were aged between 45 and 64, were at different stages of dementia and had been diagnosed with thirteen different types of dementia. Of the 55 respondents, 71% (n = 39) had received assistance from family members when completing the survey. The main financial impact of a diagnosis of young onset dementia resulted from premature loss of income and reduced and often deferred pension entitlements. In some cases, care-costs became unaffordable. Lack of clarity of processes and procedures around needs assessments, carers' assessments and financial assessments by different organisations resulted in some families having to ask for legal advice and, in some cases, involved lengthy appeal processes. Future research needs to involve Adult Social Care and Third Sector organisations to help codesign and test financial management interventions to support people affected by this progressive health condition.  相似文献   
109.
The isoschizomer pair MspI and HpaII were used to investigate whether the putative specificity of restriction endonucleases would be maintained when they were introduced into mammalian cells. Although both enzymes recognize the sequence CCGG, HpaII will cut only if the internal cytosine is unmethylated, whereas MspI will cut regardless of the methylation status. Cleavage results in a cohesive-end DNA double-strand break, which can lead to the formation of chromosome aberrations. Since mammalian DNA is heavily methylated, one would expect MspI to be much more effective than HpaII at inducing chromosome aberrations in Chinese hamster ovary cells. In fact, during G1, MspI induced a >90-fold higher number of aberrations than did HpaII. Cell cycle studies indicated that during early S there was a 30-fold increase in HpaII-induced aberrations. This increase may be due to increased accessibility of replicating hypomethylated DNA. Cells that were treated with the demethylating agent 5-aza-2-deoxycytidine (AzdC) displayed only a moderate increase in HpaII-induced aberrations during G1. This observation, together with the results of restriction enzyme analysis of genomic DNA, indicated that demethylation was incomplete. The effects of AzdC on the induction of aberrations by MspI suggested that AzdC increases chromatin accessibility. Our results were consistent with the expected specificity of MspI and HpaII. Thus, it appears that restriction endonucleases can play a useful role in determining the biological consequences of DNA double-strand breaks.  相似文献   
110.
Quality "in fact"--appropriate clinical outcomes--and quality in "perception"--consumer evaluation--are two important parts of the "image equation" for a hospital. But, how do administrators use either to promote their institutions? The authors explain how to use both to give your institution the competitive edge.  相似文献   
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