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   4927篇
  免费   296篇
  国内免费   24篇
耳鼻咽喉   19篇
儿科学   135篇
妇产科学   127篇
基础医学   629篇
口腔科学   119篇
临床医学   425篇
内科学   1258篇
皮肤病学   131篇
神经病学   414篇
特种医学   82篇
外科学   522篇
综合类   24篇
一般理论   3篇
预防医学   557篇
眼科学   92篇
药学   286篇
中国医学   13篇
肿瘤学   411篇
  2023年   33篇
  2022年   70篇
  2021年   142篇
  2020年   88篇
  2019年   142篇
  2018年   162篇
  2017年   98篇
  2016年   89篇
  2015年   121篇
  2014年   177篇
  2013年   266篇
  2012年   376篇
  2011年   392篇
  2010年   257篇
  2009年   175篇
  2008年   351篇
  2007年   329篇
  2006年   324篇
  2005年   291篇
  2004年   257篇
  2003年   252篇
  2002年   245篇
  2001年   55篇
  2000年   50篇
  1999年   46篇
  1998年   34篇
  1997年   36篇
  1996年   26篇
  1995年   27篇
  1994年   21篇
  1993年   28篇
  1992年   27篇
  1991年   33篇
  1990年   20篇
  1989年   16篇
  1988年   11篇
  1987年   8篇
  1986年   14篇
  1985年   20篇
  1984年   17篇
  1983年   14篇
  1982年   16篇
  1981年   14篇
  1980年   13篇
  1979年   7篇
  1978年   13篇
  1977年   7篇
  1976年   6篇
  1974年   4篇
  1973年   7篇
排序方式: 共有5247条查询结果,搜索用时 15 毫秒
91.
92.
93.
A varicocele is defined as the abnormal dilation of the internal testicular vein and pampiniform venus plexus within the spermatic cord. If a semen analysis is not obtained from the adolescent male, in the absence of other symptoms, the main clinical indication used by many urologists to recommend repair is testicular atrophy. The varicocele may result in testicular damage in some males causing testicular atrophy with impaired sperm production and decreased Leydig cell function, while in other males the varicocele may seemingly cause no ill effects. In adult men, varicoceles are frequently present and surgically correctable, yet the measurable benefits of surgical repair are slight according to a Cochrane review. While occurring more commonly in infertile men than fertile men, only 20% of men with a documented varicocele will suffer from fertility problems. Most varicoceles found in adolescents are detected during a routine medical examination, and it is difficult to predict which adolescent presenting with a varicocele will ultimately show diminished testicular function in adolescence or adulthood. As in adults, the mainstay of treatment for varicocele in adolescents is surgical correction. However, unlike an adult varicocelectomy (the microsurgical approach is the most common), treatment for an adolescent varicocele is more often laparoscopic. Nevertheless, the goals of treatment are the same in the adolescent and adult patients. Controversy remains as to which patients to treat, when to initiate the treatment, and what type of treatment is the best. This review will present the current understanding of the etiology, diagnosis and treatment of the adolescent varicocele.  相似文献   
94.
STUDY OBJECTIVES: To explore the relationship between sleep duration and diabetes incidence over an 8- to 10-year follow-up period in data from the First National Health and Nutrition Examination Survey (NHANES I). We hypothesized that prolonged short sleep duration is associated with diabetes and that obesity and hypertension act as partial mediators of this relationship. The increased load on the pancreas from insulin resistance induced by chronically short sleep durations can, over time, compromise beta-cell function and lead to type 2 diabetes. No plausible mechanism has been identified by which long sleep duration could lead to diabetes. DESIGN: Multivariate longitudinal analyses of the NHANES I using logistic regression models. SETTING: Probability sample (n=8992) of the noninstitutionalized population of the United States between 1982 and 1992. PARTICIPANTS: Subjects between the ages of 32 and 86 years. MEASUREMENTS AND RESULTS: Between 1982 and 1992, 4.8% of the sample (n=430) were determined by physician diagnosis, hospital record, or cause of death to be incident cases of diabetes. Subjects with sleep durations of 5 or fewer hours (odds ratio = 1.47, 95% confidence interval 1.03-2.09) and subjects with sleep durations of 9 or more hours (odds ratio = 1.52, 95% confidence interval 1.06-2.18) were significantly more likely to have incident diabetes over the follow-up period after controlling for covariates. CONCLUSIONS: Short sleep duration could be a significant risk factor for diabetes. The association between long sleep duration and diabetes incidence is more likely to be due to some unmeasured confounder such as poor sleep quality.  相似文献   
95.
96.
ABSTRACT

Agreeableness is associated with good mental health during pregnancy. Although different studies have indicated that agreeableness is related to adaptive coping, this relation has scarcely been studied in pregnant women. The aim of this study was to analyze the possible differences between high and low agreeableness in relation to coping strategies and psychiatric symptoms in pregnant women. We conducted a longitudinal prospective study between October 2009 and January 2013. Pregnant women (n = 285) were assessed in the first trimester of pregnancy, and 122 of them were assessed during the third. Data were collected using the Coping Strategies Questionnaire, the Symptom Check List 90-R, and the agreeableness subscale of the NEO-FFI. Using the SPSS 21 statistics package, binary logistic regression, two-way mixed analysis of variance, and multiple regression analyses and a Sobel test were conducted. Higher levels of agreeableness were associated with positive reappraisal and problem-solving, and lower levels of agreeableness were associated with overt emotional expression and negative self-focused coping. Women with low agreeableness had poorer mental health, especially in the first trimester. These findings should be taken into account to improve women’s experiences during pregnancy. Nevertheless, given the scarcity of data, additional studies are needed.  相似文献   
97.
The aim of this exploratory study was to gain information on the current orientation of registered nurses towards continuing education and lifelong learning. The population (N=162) consists of 2nd and 1st Level nurses who have or are currently taking part in continuing education. Qualitative empirical data were obtained through semi structured one to one interviews. The research questions sought information related to some of the reasons and motives for the participants' taking part in various categories of learning. Also explored was what factors might influence these participants' learning activities and the views and perceptions of their learning experiences. For many of these nurses, the initial motive for taking part in continuing education was the perception that they were being left behind by the higher educational level of nurses entering the profession. Contrary to some anecdotal views, the participants generally felt that higher education (HE) contributed to enhanced client care, reporting additional personal and professional satisfaction. Alleged poor support from managers for continuing education and the lack of parity, often within the same organisation regarding the selection criteria to take part in a variety of learning activities, was a source of dissatisfaction for some of these participants. Their determination to learn, however, remained strong.  相似文献   
98.
99.
Objective: This study explored the clinical features of physicians and nurses with dual diagnosis.

 Methods: We conducted a retrospective review of 150 medical records of physicians (n = 120) and nurses (n = 30) admitted from February 2008 to February 2011 to the Barcelona Psychiatric Inpatient Unit for Health Professionals. Routine intake included the Spanish version of the Psychiatric Research Interview for Substance and Mental Disorders (PRISM-IV) and a clinical interview.

 Results: The mean age of participants was 48.59 (SD = 8.9) years and 57.3% were male. Patients experienced substance dependence with alcohol (n = 112, 74.7%), sedatives (n = 59, 39.3%), cocaine (n = 24, 16%), other stimulants (n = 15, 10%), and opiates other than heroin (n = 16, 10.7%). About 41% (n = 61) also met criteria for a mental health disorder, mainly major depressive disorder (n = 42, 28%), while 8% (n = 12) had attention deficit hyperactivity disorder. A high proportion of physicians (n = 95, 79.2%) and nurses (n = 25, 83.3%) had nicotine dependence. The most common comorbidity was alcohol dependence and major depressive disorder. No differences were found between groups in the prevalence of substance use disorders, mental health disorders, and dual diagnosis.

 Conclusions: Dual diagnosis is a common condition among inpatient physicians and nurses with substance use disorders and its clinical presentation may be similar in both groups.  相似文献   

100.
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