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   1572篇
  免费   21篇
  国内免费   3篇
耳鼻咽喉   3篇
儿科学   61篇
妇产科学   38篇
基础医学   71篇
口腔科学   18篇
临床医学   47篇
内科学   407篇
皮肤病学   16篇
神经病学   74篇
特种医学   19篇
外科学   184篇
综合类   8篇
预防医学   520篇
眼科学   46篇
药学   44篇
中国医学   1篇
肿瘤学   39篇
  2023年   7篇
  2022年   5篇
  2021年   20篇
  2020年   19篇
  2019年   34篇
  2018年   31篇
  2017年   21篇
  2016年   17篇
  2015年   21篇
  2014年   20篇
  2013年   40篇
  2012年   30篇
  2011年   22篇
  2010年   23篇
  2009年   28篇
  2008年   33篇
  2007年   26篇
  2006年   27篇
  2005年   19篇
  2004年   10篇
  2003年   31篇
  2002年   17篇
  2001年   33篇
  2000年   23篇
  1999年   20篇
  1998年   18篇
  1997年   14篇
  1996年   13篇
  1995年   12篇
  1994年   8篇
  1993年   5篇
  1991年   11篇
  1990年   13篇
  1989年   7篇
  1988年   14篇
  1987年   7篇
  1986年   7篇
  1985年   64篇
  1984年   112篇
  1983年   98篇
  1982年   101篇
  1981年   61篇
  1980年   70篇
  1979年   76篇
  1978年   60篇
  1977年   49篇
  1976年   70篇
  1975年   45篇
  1974年   48篇
  1973年   32篇
排序方式: 共有1596条查询结果,搜索用时 15 毫秒
1.
Problem definitions constitute a crucial part of the policy process. In 2008 the Labour Government presented a plan to reduce the obesity prevalence in England. Only three years later the Conservative–Liberal Government introduced a plan on the same topic, which it presented as new and innovative. The aim of this study is to analyse the respective governments’ problematisations of obesity and to identify similarities and differences. Despite the different hues of the two governments, the programmes are surprisingly similar. They seek to simultaneously govern and not to govern. They adhere to liberal ideals of individual choice and they also suggest initiatives that will lead people to choose certain behaviours. Both governments encourage the food and drink industry to support their policies voluntarily, rather than obliging them to do so, although Labour is somewhat more inclined to use statutory measures. The Conservative–Liberal plan does not represent many new ideas. The plans are characterised by the paradox that they convey both ideas and ideals about freedom of choice as well as about state interventions to influence people's choices, which could be seen as incompatible, but as the study shows in practice they are not.  相似文献   
2.
3.
BackgroundThis study aimed to investigate the trend of hospital admissions related to poisoning by narcotics and psychodysleptics and poisoning by antiepileptic, sedative-hypnotic, and antiparkinsonism drugs in England and Wales between April 1999 and April 2020.MethodsAn observational ecological study were conducted using data from the Hospital Episode Statistics database in England and the Patient Episode Database for Wales. The rate of hospital admissions with 95% confidence intervals (CIs) was calculated by dividing the number of episodes of poisoning by narcotics and psychodysleptics related admission and poisoning by antiepileptic, sedative-hypnotic, and antiparkinsonism drugs-related admission by the mid-year population from the Office for National Statistics. All analyses were conducted using SPSS version 27.ResultsThe total annual number of hospital admissions for narcotics and psychodysfunctionals poisonings increased by 1.40-fold [from 15.70 (95% CI 15.36–16.04) in 1999 to 37.64 (95% CI 37.15–38.13) in 2020 per 100,000 people, p < 0.01]. However, the overall annual number of poisonings by antiepileptic, sedative-hypnotic and antiparkinsonism drugs hospital admissions for various reasons decreased by 12.8% [from 33.55 (95% CI 33.05–34.04) in 1999 to 29.26 (95% CI 28.82–29.69) in 2020 per 100,000 persons, p < 0.05]. Poisoning by other opioids (53.2%), heroin (15.1%), and other synthetic narcotics (13.3%) were the most common reasons for narcotic and psychodysfunctional poisoning. While poisoning by benzodiazepines (54.2%) and poisoning: other antiepileptic and sedative-hypnotic drugs (30.7%) were the most common hospital admission reasons for poisoning by antiepileptic, sedative-hypnotic, and antiparkinsonism.ConclusionPoisoning by narcotics have increased in England and Wales over the study period, however, poisoning by antiepileptic, sedative-hypnotic, and antiparkinsonism drugs in England and Wales were relatively stable during the same period. Future initiatives and awareness programs to prevent harmful use and drug poisoning by narcotics, sedative-hypnotic and other medications are needed.  相似文献   
4.

Background

The NHS Choices website (www.nhs.uk) provides data on the opening hours of general practices in England. If the data are accurate, they could be used to examine the benefits of extended hours.

Aim

To determine whether online data on the opening times of general practices in England are accurate regarding the number of hours in which GPs provide face-to-face consultations.

Design and setting

Cross-sectional comparison of data from NHS Choices and telephone survey data reported by general practice staff, for a nationally representative sample of 320 general practices (December 2013 to September 2014).

Method

GP face-to-face consultation times were collected by telephone for each sampled practice for each day of the week. NHS Choices data on surgery times were available online. Analysis was based on differences in the number of surgery hours (accounting for breaks) and the times of the first and last consultations of the day only between the two data sources.

Results

The NHS Choices data recorded 8.8 more hours per week than the survey data on average (40.1 versus 31.2; 95% confidence interval [CI] = 7.4 to 10.3). This was largely accounted for by differences in the recording of breaks between sessions. The data were more similar when only the first and last consultation times were considered (mean difference = 1.6 hours; 95% CI = 0.9 to 2.3).

Conclusion

NHS Choices data do not accurately measure the number of hours in which GPs provide face-to-face consultations. They better record the hours between the first and last consultations of the day.  相似文献   
5.
6.
Plasma amino acid concentrations were determined in groups of normal control subjects under fasting and postprandial conditions. Differences were observed that were found to be, to a considerable extent, sex-related. Fasting females had lower concentrations than fasting males of several amino acids, although postprandial differences in concentrations between the sexes were not significant. Under the dietary conditions normal for a British population, no significant diurnal variation of plasma amino acid concentrations was found. Reducing the dietary protein by 30% failed to affect plasma amino acid concentrations; however, increasing the dietary protein by 50% resulted in a significant increase in the plasma concentrations of several amino acids, and induced a significant degree of variation throughout the day in six, proline, half-cystine, methionine, valine, leucine, and isoleucine. The importance of these results with regard to the interpretation of population mean values and disease diagnosis is discussed.  相似文献   
7.
BackgroundChildren’s burn injuries can have a significant psychosocial impact on parents. However, the stress involved in caring for a child following a burn can often go unrecognized and does not necessarily prompt help seeking by parents.ObjectiveIt is common for adults to seek health-related support and information via the Internet. Many benefit from immediate and easy access to online psychological interventions. A prototype burn-specific, parent-focused, peer-informed, supportive website, designed to provide easy access to information and psychoeducation, was created and tested for acceptability.Patient involvementUsing a partnership-based method of website development, parents and professionals (clinical, academic and support organizations) were recruited and their particular expertise was acknowledged and valued. A participatory action approach was adopted to determine the acceptability of the website for parents/carers.Methods31 participants (9 parents, 22 professionals) tested a prototype version of the website. Data was collected using the eHealth Impact Questionnaire and the concurrent think-aloud protocol.ResultsParents and professionals had favorable opinions of the website. Parents’ ratings tended to be more favorable than professionals’, which was significant for the information and presentation. Participants’ thoughts were categorized into seven topics: need, structure/navigation, trust/relevance, language/comprehension, therapeutic content, mode of delivery, and suggested improvements.DiscussionMany practical and psychological barriers can prevent parents of burn-injured children accessing psychosocial support and contribute to a feeling of isolation. Participants felt that the website would be a valuable addition to UK pediatric burn care. The existence of an accessible resource could help to normalize parents’ experience of their child’s injury and reduce their perceived isolation, although peer interaction is not provided by the website.Practical valueThis online resource, hosting information and peers’ personal experiences, offers promising and exciting opportunities to empower parents whilst providing accessible supportive advice to encourage self-care and formal/informal support seeking when necessary.  相似文献   
8.
9.
Genetic sequences of a highly pathogenic avian influenza (H5N8) virus in England have high homology to those detected in mainland Europe and Asia during 2014. Genetic characterization suggests this virus is an avian-adapted virus without specific affinity for zoonoses. Spatio-temporal detections of H5N8 imply a role for wild birds in virus spread.  相似文献   
10.
In a context of ever increasing demand, the recent economic downturn has placed further pressure on decision-makers to effectively target healthcare resources. Over recent years there has been a push to develop more explicit evidence-based priority-setting processes, which aim to be transparent and inclusive in their approach and a number of analytical tools and sources of evidence have been developed and utilised at national and local levels. This paper reports findings from a qualitative research study which investigated local priority-setting activity across five English Primary Care Trusts, between March and November 2012. Findings demonstrate the dual aims of local decision-making processes: to improve the overall effectiveness of priority-setting (i.e. reaching ‘correct’ resource allocation decisions); and to increase the acceptability of priority-setting processes for those involved in both decision-making and implementation. Respondents considered priority-setting processes to be compartmentalised and peripheral to resource planning and allocation. Further progress was required with regard to disinvestment and service redesign with respondents noting difficulty in implementing decisions. While local priority-setters had begun to develop more explicit processes, public awareness and input remained limited. The leadership behaviours required to navigate the political complexities of working within and across organisations with differing incentives systems and cultures remained similarly underdeveloped.  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