全文获取类型
收费全文 | 1899篇 |
免费 | 100篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 60篇 |
儿科学 | 64篇 |
妇产科学 | 53篇 |
基础医学 | 160篇 |
口腔科学 | 68篇 |
临床医学 | 211篇 |
内科学 | 497篇 |
皮肤病学 | 37篇 |
神经病学 | 115篇 |
特种医学 | 191篇 |
外科学 | 157篇 |
综合类 | 16篇 |
一般理论 | 3篇 |
预防医学 | 110篇 |
眼科学 | 30篇 |
药学 | 124篇 |
中国医学 | 3篇 |
肿瘤学 | 120篇 |
出版年
2021年 | 22篇 |
2020年 | 15篇 |
2019年 | 25篇 |
2018年 | 25篇 |
2017年 | 32篇 |
2016年 | 22篇 |
2015年 | 32篇 |
2014年 | 42篇 |
2013年 | 67篇 |
2012年 | 80篇 |
2011年 | 77篇 |
2010年 | 65篇 |
2009年 | 77篇 |
2008年 | 92篇 |
2007年 | 107篇 |
2006年 | 84篇 |
2005年 | 87篇 |
2004年 | 81篇 |
2003年 | 47篇 |
2002年 | 60篇 |
2001年 | 47篇 |
2000年 | 50篇 |
1999年 | 56篇 |
1998年 | 51篇 |
1997年 | 54篇 |
1996年 | 40篇 |
1995年 | 39篇 |
1994年 | 21篇 |
1993年 | 31篇 |
1992年 | 37篇 |
1991年 | 36篇 |
1990年 | 45篇 |
1989年 | 32篇 |
1988年 | 48篇 |
1987年 | 39篇 |
1986年 | 31篇 |
1985年 | 26篇 |
1984年 | 16篇 |
1983年 | 18篇 |
1982年 | 17篇 |
1981年 | 9篇 |
1980年 | 10篇 |
1978年 | 14篇 |
1977年 | 6篇 |
1976年 | 8篇 |
1975年 | 10篇 |
1974年 | 8篇 |
1970年 | 10篇 |
1969年 | 13篇 |
1968年 | 6篇 |
排序方式: 共有2019条查询结果,搜索用时 15 毫秒
1.
2.
Angiolillo Dominick J. Bhatt Deepak L. Lanza Frank Cryer Byron Dong Jin-fei Jeske Walter Zimmerman Ronald R. von Chong Estela Prats Jayne Deliargyris Efthymios N. Marathi Upendra 《Journal of thrombosis and thrombolysis》2019,48(4):554-562
Journal of Thrombosis and Thrombolysis - Aspirin (acetylsalicylic acid, ASA) can lead to gastrointestinal mucosal injury through disruption of its protective phospholipid bilayer. A liquid... 相似文献
3.
Maurizio Miano Enrico Cappelli Agnese Pezzulla Roberta Venè Alice Grossi Paola Terranova Elena Palmisani Rosario Maggiore Daniela Guardo Tiziana Lanza Michaela Calvillo Concetta Micalizzi Filomena Pierri Chiara Vernarecci Andrea Beccaria Fabio Corsolini Marina Lanciotti Giovanna Russo Isabella Ceccherini Carlo Dufour Francesca Fioredda 《British journal of haematology》2019,187(4):502-508
4.
5.
Fabrizio Di Francesco Gennaro De Marco Ugo Antonello Gironi Carnevale Michele Lanza Alessandro Lanza 《Journal of prosthodontic research》2019,63(1):15-24
Purpose
The number of implants needed to support a maxillary overdenture is still a controversial issue. The aim of this systematic review was to investigate the number of implants required to support a maxillary overdenture in order to obtain optimal treatment outcomes in terms of implant survival, overdenture longevity and patient satisfaction.Study selection
Pubmed and EMBASE databes were systematically searched and complemented by hand searching from 2000 to 2017. The Prisma statement and a PICOS approach were adopted. All selected articles provided at least two-year follow-up and 10 totally edentulous patients. Survival rate of implants and overdentures were statistically analyzed according to number of implants and according to splitting technique, employing non-parametric Fisher Test for unpaired data. For the pooled analysis of implant failures, the odds ratio between group of 4 splinted implants and group of more than 4 splinted was calculated.Results
A total of 28 articles were included. Data analysis of the included studies showed that the survival rate of implants appeared higher in ≥ 4 implants group, whereas the high survival rate of overdentures and patient satisfaction were not significantly influenced by the number of implants.Conclusions
The findings of our analysis indicate that overall the most frequent tendency is to place at least four implants, splinted or unsplinted, in order to ensure a higher survival rate of implants. However, the relationship between overdenture survival, the patient’s quality of life, and the number of implants required to support a maxillary overdenture has yet to be clarified. 相似文献6.
Thomas G. Balshaw Garry J. Massey Thomas M. Maden‐Wilkinson Marcel B. Lanza Jonathan P. Folland 《Scandinavian journal of medicine & science in sports》2019,29(3):348-359
The purpose of this study was to compare the effect of resistance training (RT) duration, including years of exposure, on agonist and antagonist neuromuscular activation throughout the knee extension voluntary torque range. Fifty‐seven healthy men (untrained [UNT] n = 29, short‐term RT [12WK] n = 14, and long‐term RT [4YR] n = 14) performed maximum and sub‐maximum (20%‐80% maximum voluntary torque [MVT]) unilateral isometric knee extension contractions with torque, agonist and antagonist surface EMG recorded. Agonist EMG, including at MVT, was corrected for the confounding effects of adiposity (ie, muscle‐electrode distance; measured with ultrasonography). Quadriceps maximum anatomical cross‐sectional area (QACSAMAX; via MRI) was also assessed. MVT was distinct for all three groups (4YR +60/+39% vs UNT/12WK; 12WK +15% vs UNT; 0.001 < P ≤ 0.021), and QACSAMAX was greater for 4YR (+50/+42% vs UNT/12WK; [both] P < 0.001). Agonist EMG at MVT was +44/+33% greater for 4YR /12WK ([both] P < 0.001) vs. UNT, but did not differ between RT groups. The torque‐agonist EMG relationship of 4YR displayed a right/down shift with lower agonist EMG at the highest common torque (196 Nm) compared to 12WK and UNT (0.005 ≤ P ≤ 0.013; Effect size [ES] 0.90 ≤ ES ≤ 1.28). The torque‐antagonist EMG relationship displayed a lower slope with increasing RT duration (4YR < 12WK < UNT; 0.001 < P ≤ 0.094; 0.56 ≤ ES ≤ 1.31), and antagonist EMG at the highest common torque was also lower for 4YR than UNT (?69%; P < 0.001; ES = 1.18). In conclusion, 4YR and 12WK had similar agonist activation at MVT and this adaptation may be maximized during early months of RT. In contrast, inter‐muscular coordination, specifically antagonist coactivation was progressively lower, and likely continues to adapt, with prolonged RT. 相似文献
7.
Elpida Piperopoulos Marianna Fazio Emanuela Mastronardo Maurizio Lanza Candida Milone 《Materials》2021,14(5)
Thermochemical materials (TCM) are among the most promising systems to store high energy density for long-term energy storage. To be eligible as candidates, the materials have to fit many criteria such as complete reversibility of the reaction and cycling stability, high availability of the material at low cost, environmentally friendliness, and non-toxicity. Among the most promising TCM, the Mg(OH)2/MgO system appears worthy of attention for its properties in line with those required. In the last few decades, research focused its attention on the optimization of attractive hydroxide performance to achieve a better thermochemical response, however, often negatively affecting its energy density per unit of volume and therefore compromising its applicability on an industrial scale. In this study, pure Mg(OH)2 was developed using different synthesis procedures. Reverse deposition precipitation and deposition precipitation methods were used to obtain the investigated samples. By adding a cationic surfactant (cetyl trimethylammonium bromide), deposition precipitation Mg(OH)2 (CTAB-DP-MH) or changing the precipitating precursor (N-DP-MH), the structural, physical and morphological characteristics were tuned, and the results were compared with a commercial Mg(OH)2 sample. We identified a correlation between the TCM properties and the thermochemical behavior. In such a context, it was demonstrated that both CTAB-DP-MH and N-DP-MH improved the thermochemical performances of the storage medium concerning conversion (64 wt.% and 74 wt.% respectively) and stored and released heat (887 and 1041 ). In particular, using the innovative technique not yet investigated for thermal energy storage (TES) materials, with NaOH as precipitating precursor, N-DP-MH reached the highest stored and released heat capacity per volume unit, ~684 MJ/m3. 相似文献
8.
9.
10.