全文获取类型
收费全文 | 9215篇 |
免费 | 673篇 |
国内免费 | 24篇 |
专业分类
耳鼻咽喉 | 113篇 |
儿科学 | 253篇 |
妇产科学 | 188篇 |
基础医学 | 1549篇 |
口腔科学 | 175篇 |
临床医学 | 1053篇 |
内科学 | 1937篇 |
皮肤病学 | 265篇 |
神经病学 | 778篇 |
特种医学 | 327篇 |
外科学 | 1302篇 |
综合类 | 85篇 |
一般理论 | 9篇 |
预防医学 | 676篇 |
眼科学 | 154篇 |
药学 | 520篇 |
中国医学 | 8篇 |
肿瘤学 | 520篇 |
出版年
2023年 | 58篇 |
2022年 | 75篇 |
2021年 | 197篇 |
2020年 | 151篇 |
2019年 | 213篇 |
2018年 | 215篇 |
2017年 | 194篇 |
2016年 | 233篇 |
2015年 | 230篇 |
2014年 | 287篇 |
2013年 | 417篇 |
2012年 | 589篇 |
2011年 | 579篇 |
2010年 | 289篇 |
2009年 | 276篇 |
2008年 | 515篇 |
2007年 | 479篇 |
2006年 | 458篇 |
2005年 | 445篇 |
2004年 | 486篇 |
2003年 | 416篇 |
2002年 | 383篇 |
2001年 | 165篇 |
2000年 | 164篇 |
1999年 | 150篇 |
1998年 | 106篇 |
1997年 | 95篇 |
1996年 | 109篇 |
1995年 | 87篇 |
1994年 | 72篇 |
1993年 | 69篇 |
1992年 | 120篇 |
1991年 | 93篇 |
1990年 | 115篇 |
1989年 | 110篇 |
1988年 | 106篇 |
1987年 | 84篇 |
1986年 | 84篇 |
1985年 | 97篇 |
1984年 | 54篇 |
1983年 | 75篇 |
1982年 | 66篇 |
1981年 | 76篇 |
1980年 | 41篇 |
1979年 | 43篇 |
1978年 | 55篇 |
1977年 | 56篇 |
1976年 | 55篇 |
1975年 | 51篇 |
1974年 | 44篇 |
排序方式: 共有9912条查询结果,搜索用时 15 毫秒
1.
Christian Holm Hansen Shelley Lees Saidi Kapiga Janet Seeley Tony Barnett 《Global public health》2020,15(3):402-413
ABSTRACTMeasuring hope reliably and accurately remains an important research objective, not least in less prosperous settings where ‘holding on to hope’ may be critically important in the struggle against adverse life conditions. The State Hope Scale was designed for use in the US. Despite reported application in diverse cultures and using translations the scale has not been extensively validated outside US populations. This study contributes to a larger project exploring the measurement of hope and provides a critique of Snyder’s scale as used in a Tanzanian female population of 1021 urban microfinance participants. We evaluate the scale’s validity through assessment of the empirical distribution of scores, item response profiles, internal consistency and discriminatory ability. Participants mostly scored very high and many reached very near the maximum attainable score. Hardly any endorsed the negative half of the response scale. Several problems are discussed including poor discrimination and strong evidence of acquiescence response bias. We also found little association of the scale scores with hypothesised correlates of hope. Future improvements on the measurement of hope are recommended, especially in studies outside the narrow Western context in which the scale was devised. 相似文献
2.
3.
4.
5.
Albert De Decker Rosalie Fergusson Benjamin Ondruschka Niels Hammer Johann Zwirner 《Clinical anatomy (New York, N.Y.)》2020,33(4):522-529
For 50 years now, sacrospinous ligament fixation (SSLF) has been used to treat pelvic organ prolapse consequent on altered integrity of the pelvic myofascial structures. It is usually performed vaginally, but it has recently been performed laparoscopically through either an anterior or a posterior approach, with the broad ligament as a landmark to differentiate the two. In the present study, these two laparoscopic approaches were assessed using Thiel-embalmed cadavers. The anterior and posterior approaches were compared in terms of the closest distance to anatomical structures at risk, including pelvic viscera, the obturator nerve, and vascular structures. The posterior approach was more often closer to the investigated vessels and the rectum. The obturator nerve and the ureter were close to both the anterior and posterior approaches. The urinary bladder was closer using the anterior approach. From an anatomical standpoint, therefore, the anterior laparoscopic approach for SSLF is more likely to cause injury to the urinary bladder, whereas the posterior approach is more prone to causing rectal and vessel injuries. This study illustrates, from a basic science perspective, the importance of combining fascia research, novel endoscopic or minimally invasive surgical exposures informed by anatomy, and contemporary trends in gynecology in order to improve patient outcomes. Clin. Anat. 33:522–529, 2020. © 2019 Wiley Periodicals, Inc. 相似文献
6.
7.
P Rubin S Holm L Friberg P Videbech H S Andersen B B Bendsen N Str?ms? J K Larsen N A Lassen R Hemmingsen 《Archives of general psychiatry》1991,48(11):987-995
To measure prefrontal and subcortical activity during a cognitive task, we examined 19 newly diagnosed schizophrenics and patients with schizophreniform psychosis. Seven healthy volunteers served as controls. The patients were drug naive or had received neuroleptics for a few days only. Cerebral blood flow distribution was depicted by single photon emission computed tomography at rest and during activation with the Wisconsin Card Sorting Test. A significant relative activation deficit in the left inferior-prefrontal region was revealed during the Wisconsin Card Sorting Test in the patient group. Furthermore, the patients had impaired striatal suppression on the left side during the cognitive task. The test performance was significantly impaired in the patients. The inability to reduce striatal activity may be due to a lack of corticostriatal feedback during prefrontal activation. 相似文献
8.
BACKGROUND: Tinnitus is an uncomfortable symptom for the patient and an embarrassing one for the consulted physician. So far, there is no treatment that can be considered well established in terms of providing long-term reduction of tinnitus in excess of placebo effects. There is considerable evidence of pathophysiological similarity between tinnitus and chronic pain. Some forms of chronic pain can be treated by neurostimulation. OBJECTIVE: This study was designed to investigate the feasibility of neurostimulation of the cochlear nerve in order to reduce tinnitus. STUDY DESIGN: Pilot study. SETTING: Tertiary referral center. PATIENTS: Five patients with therapeutically refractory tinnitus were selected for this study. INTERVENTION: Placing a stimulation lead around the cochlear nerve through the suboccipital approach and connecting the stimulation lead to a pulse generator. MAIN OUTCOME MEASURES: The patients experienced 1) an absence of major or minor complications, such as death, meningitis, cranial nerve deficit, and vestibular problems; 2) tolerance of the procedure as considered by the patient; 3) relief of tinnitus in at least one patient. RESULTS: Implantation of the neurostimulation system was accomplished in each patient without any difficulty. None of the patients considered the treatment unbearable. No major or minor complications occurred in this study. Subjective tinnitus reduction was accomplished in four patients. CONCLUSION: Our preliminary data show that neurostimulation of the cochlear nerve is feasible, is bearable for the patient, and is a safe treatment modality without major complications. The effects on tinnitus are promising. 相似文献
9.
Direct (intraarterial) and two indirect (using a mercury sphygmomanometer [MS] and an automatic [auscultatory] device) methods of blood pressure measurement were compared in intensive care patients (N = 32). One trained observer blind to both automatic and direct measurements obtained all indirect MS measurements. All direct and indirect measurements were made on the same arm. Direct measurements were obtained from 10-second strip chart recordings. In normotensive patients both indirect measurements of systolic blood pressure (SBP) underestimated the direct SBP; however, only the SBP value obtained with the automatic device (106 mm Hg) was significantly different, p less than .05, from the direct SBP value (120 mm Hg). No significant difference was noted between methods in measurement of normotensive diastolic blood pressure. In hypertensive patients direct SBP was significantly greater, p less than .05, from both values obtained by indirect measurement. In patients without hypotension the automatic device may be substituted for the MS and direct blood pressure methods. The automatic device may offer the advantage of decreasing observer bias and variability in blood pressure measurement. 相似文献
10.
Shirzad Houshian Charlotte Buch G thgen Niels Wisbech Pedersen S ren Harving 《Acta orthopaedica》2004,75(3):249-251
We report our experience with elastic stable intramedullary titanium nailing (ESIN) of femoral shaft fractures in children. From 1998 to 2001, we treated 31 children (20 boys), median age 6 (4-11) years, with ESIN for 29 closed and 2 grade I open femoral shaft fractures. We reviewed 30 children clinically after median 1.5 (1-3) years. Their median hospital stay was 6 (2-20) days. All fractures were radiographically united at a median of 7 (5-9) weeks. The nails were removed in 29 children after a median of 22 (6-38) weeks postoperatively. At follow-up, we found a leg-length discrepancy up to 1 cm in 6 children and 10 degrees of internal rotational deformity in 1 child. No angular deformity had occurred. Elastic stable intramedullary nailing seems to be a safe method for the treatment of femoral shaft fractures in children between 4 and 11 years of age. 相似文献