全文获取类型
收费全文 | 68618篇 |
免费 | 6145篇 |
国内免费 | 3455篇 |
专业分类
耳鼻咽喉 | 597篇 |
儿科学 | 1105篇 |
妇产科学 | 1245篇 |
基础医学 | 8253篇 |
口腔科学 | 1309篇 |
临床医学 | 7878篇 |
内科学 | 11518篇 |
皮肤病学 | 918篇 |
神经病学 | 3598篇 |
特种医学 | 2673篇 |
外国民族医学 | 34篇 |
外科学 | 8002篇 |
综合类 | 9113篇 |
现状与发展 | 15篇 |
一般理论 | 21篇 |
预防医学 | 4647篇 |
眼科学 | 1590篇 |
药学 | 7004篇 |
53篇 | |
中国医学 | 3091篇 |
肿瘤学 | 5554篇 |
出版年
2024年 | 184篇 |
2023年 | 907篇 |
2022年 | 2232篇 |
2021年 | 3157篇 |
2020年 | 2231篇 |
2019年 | 2124篇 |
2018年 | 2277篇 |
2017年 | 2010篇 |
2016年 | 2023篇 |
2015年 | 2731篇 |
2014年 | 3428篇 |
2013年 | 3571篇 |
2012年 | 5090篇 |
2011年 | 5320篇 |
2010年 | 3409篇 |
2009年 | 2804篇 |
2008年 | 3892篇 |
2007年 | 3957篇 |
2006年 | 3654篇 |
2005年 | 3473篇 |
2004年 | 2785篇 |
2003年 | 2577篇 |
2002年 | 2322篇 |
2001年 | 1702篇 |
2000年 | 1625篇 |
1999年 | 1485篇 |
1998年 | 822篇 |
1997年 | 823篇 |
1996年 | 673篇 |
1995年 | 570篇 |
1994年 | 492篇 |
1993年 | 346篇 |
1992年 | 526篇 |
1991年 | 431篇 |
1990年 | 400篇 |
1989年 | 353篇 |
1988年 | 282篇 |
1987年 | 266篇 |
1986年 | 210篇 |
1985年 | 171篇 |
1984年 | 123篇 |
1983年 | 92篇 |
1982年 | 66篇 |
1981年 | 77篇 |
1980年 | 48篇 |
1979年 | 73篇 |
1978年 | 40篇 |
1974年 | 37篇 |
1973年 | 35篇 |
1972年 | 43篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Attila Szalmas Peter Bodrogi Cecilia Sik-Lanyi 《Ophthalmic & physiological optics》2006,26(3):281-287
The objective of this study is to test the luminous efficiency functions V(lambda), V'(lambda), V(10)(lambda) and their linear combinations on the basis of a data set gained from a simulated mesopic night-time driving experiment. Another aim is to provide 'real-world' data for the 'X framework' or 'linear combination model', and to find out its limits in a practical situation. Human performance was measured by the reaction time method. Results show that the single parameter of the linear combination of photopic and scotopic luminous efficiency functions can be determined analytically with little variation for a given mesopic background luminance level and a given visual target colour, but the computation leads to considerable deviations comparing all three target colours (red, green and blue) used in the experiment. The conclusion for the given experimental conditions is that the single parameter of the linear combination model has an increasing deviation for lower background luminance levels. 相似文献
2.
医源性胆管狭窄X线表现 总被引:1,自引:0,他引:1
本文报道了13例医源性胆管狭窄,分析其影像表现。特点为:环形狭窄;线样狭窄,包括规则的和不规则的线样狭窄;闭塞性狭窄;胆管闭塞和胆管中断分离。ERCT和PCT对狭窄的形态,位置及长度显示优于CT和US。 相似文献
3.
4.
Roberto H. Caraballo Laura Gañez Cecilia De los Santos Alberto Espeche Ricardo Cersósimo Natalio Fejerman 《Seizure》2009,18(10):686-689
PurposeTo analyze the electroclinical features, aetiology and outcome in patients with normal neurological examination and psychomotor development who presented seizures during a mild gastroenteritis (MG).Patients and methodsEvaluation of the clinical charts of 22 patients who were assessed in the Neurology Department, Hospital Nacional de Pediatría Prof. Dr. JP Garrahan between 1999 and 2007.ResultsTwelve patients were boys and 10 were girls, the age of onset ranged from 5 to 26 months, and the median age was 10 months. Rotavirus antigen test in stool was positive in 9 of 18 studied patients. The seizures were brief, focal with secondary generalization in 15 patients (68.5%), apparently generalized in 5 (22.5%) and focal in two (9%). Seven of the patients (35%) had more than one seizure in 24 h. The interictal EEG was normal in all patients. Neuroradiological studies were performed in 19 patients with a normal result. No patient was put on long-term treatment with antiepileptic drugs. Four patients had subsequent mild gastroenteritis and two of them presented convulsions during the disease. After between 12 and 67 months of follow-up, all patients had normal psychomotor development and neurological examination.ConclusionsIn this study we confirmed the association of benign infantile seizures (BIS) and MG with or without rotavirus. The identification of this entity allows avoiding unnecessary complementary studies and treatment with antiepileptic drugs. 相似文献
5.
6.
John Jenn-Yenn Lu Chi-Chia Cheng Shieu-Ming Chou Chang-Bor Hor Yi-Chen Yang Hsiang-Ling Wang 《Vaccine》2009
The first universal hepatitis B vaccination program for newborns in the world was launched in Taiwan in July 1984. Most studies on the effectiveness of hepatitis B vaccination focused on the seroprevalence of HBs Ag among children under 14 years old. Only few studies focused on the seropositivity of anti-HBs among adolescents aged 15–18 years old. The present study aimed to evaluate the impact of the nationwide hepatitis B vaccination program on the immunity to HBV infection and the necessity of boost among adolescents. In this study including eight annual seroprevalence surveys from 2000 to 2007, 2342 college entrants (1589 15-year-olds in group I and 753 18-year-olds in group II) and 1851 university freshmen (18-year-olds in group III) participated. Subjects identified anti-HBs, HBs Ag and anti-HBc negative were given boost three doses of HBV vaccine. The HBs Ag seroprevalence was 11.6%, 3.5% and 1.0% for participants who were born before 1984, 1984–1986 and after 1986. The anti-HBs-seropositive rates were significantly higher in group II (83.1%) than in group I (53.0%) and group III (53.5%). All 572 participants who were seronegative for anti-HBs, HBs Ag and anti-HBc became anti-HBs-seropositive after catch-up vaccination. It is concluded that the anti-HBs-seropositive rate decreased to 50% in 15 years after vaccination, and boost vaccination was 100% effective. The necessity and age for boost among anti-HBs negative adolescents and the timing of the first immunization should be further evaluated. 相似文献
7.
Mao-Sheng Ran Meng-Ze Xiang Jie Li Jian Huang Eric Yu-Hai Chen Cecilia Lai-Wan Chan Yeates Conwell 《Archives of Suicide Research》2007,11(1):119-127
The aim of this study was to compare the demographic and clinical characteristics of individuals with affective disorders who had attempted suicide at some time in their lives and those who had not made a suicide attempt. In a Chinese rural community, individuals with suicide attempt (N = 30) and those without suicide attempt (N = 166) were assessed with Present State Examination (PSE). Attempters had a significantly higher level of family economic status, higher rate of lifetime depressed mood and hopelessness, and delusions than nonattempters. The logistic regression models also indicated that depressed mood and hopelessness were the most important predictors of suicide attempts. No significant difference in treatment condition was found between attempters and non-attempters. Early identification and interventions focusing on reducing depressed mood, hopelessness, and controlling psychotic symptoms may be helpful in reducing the risk of suicide attempts among individuals with affective disorders residing in the community. 相似文献
8.
9.
10.
Vanaporn Wuthiekanun Varunee Desakorn Gumphol Wongsuvan Premjit Amornchai Allen C. Cheng Bina Maharjan Direk Limmathurotsakul Wirongrong Chierakul Nicholas J. White Nicholas P. J. Day Sharon J. Peacock 《Clinical and Vaccine Immunology : CVI》2005,12(4):555-556
An immunofluorescent (IF) method that detects Burkholderia pseudomallei in clinical specimens within 10 min was devised. The results of this rapid method and those of an existing IF method were prospectively compared with the culture results for 776 specimens from patients with suspected melioidosis. The sensitivities of both IF tests were 66%, and the specificities were 99.5 and 99.4%, respectively. 相似文献