全文获取类型
收费全文 | 12662篇 |
免费 | 1416篇 |
国内免费 | 207篇 |
专业分类
耳鼻咽喉 | 32篇 |
儿科学 | 470篇 |
妇产科学 | 122篇 |
基础医学 | 1079篇 |
口腔科学 | 169篇 |
临床医学 | 2531篇 |
内科学 | 2129篇 |
皮肤病学 | 55篇 |
神经病学 | 917篇 |
特种医学 | 798篇 |
外科学 | 730篇 |
综合类 | 834篇 |
现状与发展 | 1篇 |
一般理论 | 1篇 |
预防医学 | 2967篇 |
眼科学 | 61篇 |
药学 | 544篇 |
13篇 | |
中国医学 | 297篇 |
肿瘤学 | 535篇 |
出版年
2024年 | 71篇 |
2023年 | 364篇 |
2022年 | 623篇 |
2021年 | 799篇 |
2020年 | 749篇 |
2019年 | 805篇 |
2018年 | 721篇 |
2017年 | 695篇 |
2016年 | 548篇 |
2015年 | 559篇 |
2014年 | 795篇 |
2013年 | 1406篇 |
2012年 | 528篇 |
2011年 | 621篇 |
2010年 | 495篇 |
2009年 | 465篇 |
2008年 | 518篇 |
2007年 | 469篇 |
2006年 | 370篇 |
2005年 | 318篇 |
2004年 | 251篇 |
2003年 | 238篇 |
2002年 | 241篇 |
2001年 | 185篇 |
2000年 | 137篇 |
1999年 | 142篇 |
1998年 | 124篇 |
1997年 | 114篇 |
1996年 | 104篇 |
1995年 | 85篇 |
1994年 | 92篇 |
1993年 | 69篇 |
1992年 | 67篇 |
1991年 | 51篇 |
1990年 | 45篇 |
1989年 | 41篇 |
1988年 | 47篇 |
1987年 | 48篇 |
1986年 | 30篇 |
1985年 | 42篇 |
1984年 | 25篇 |
1983年 | 23篇 |
1982年 | 19篇 |
1981年 | 20篇 |
1980年 | 28篇 |
1979年 | 20篇 |
1978年 | 22篇 |
1977年 | 15篇 |
1976年 | 14篇 |
1971年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
运动对骨质疏松的影响 总被引:1,自引:0,他引:1
本研究对运动影响骨质疏松的机制,运动对骨代谢、骨生物力学、骨密度的影响的研究现状与进展进行综述,可为骨质疏松症的预防和治疗提供理论参考资料。 相似文献
42.
为了比较中国内地城市和香港青少年儿童的心肺耐力和肌肉素质,对两地的青少年儿童体质调查数据进行了比较研究。结果发现:内地各年龄组男女生的心肺耐力均优于香港同龄者;香港青少年儿童的肌肉素质除立定跳远外,其他项目的成绩均弱于内地青少年儿童。提示:随着生活水平的提高,应重视青少年儿童对体育活动的参与。 相似文献
43.
R Mokni A Chakar F Bleiberg-Daniel JL Mahu PA Walravens P Chappuis J Navarro D Lemonnier 《Acta paediatrica (Oslo, Norway : 1992)》1993,82(6-7):539-543
Biochemical markers of nutritional status (albumin, transthyretin, insulin-like growth factor-I and zinc) were measured in slowly growing two- to five-year-old, low-income Parisian children whose weight-for-height or height-for-age z scores (WHZ or HAZ) were between — 1 and — 2 SD of the NCHS median. The results were compared to controls who were matched for age, sex, and ethnic origin with WHZ and HAZ between — 1 and + 2 SD. Mean serum levels of transthyretin, albumin and insulin-like growth factor-I and mean plasma zinc concentrations were significantly lower in the growth-impaired children than in the controls ( p = 0.002, p = 0.006, p = 0.015, and p = 0.035, respectively). While the height-retarded children had low mean serum insulin-like growth factor-I values, the weight-retarded subjects had decreased levels of albumin, transthyretin and zinc when compared to controls. Lower mean levels of nutritional markers in healthy, slowly growing children suggest that inadequate dietary intakes of zinc, protein and/or energy may result in marginal delays in weight and height gains. 相似文献
44.
当代大学生手淫行为比较普遍,很多大学生在上大学之前就养成了难以自控的手淫习惯。大学生手淫既影响了他们的身心健康,对他们在校园里健康成长成材也构成了严重的威胁。从思想与心里教育角度引导大学生正确对待手淫,促使他们养成积极健康的生活习惯,对他们将来人生的健康发展及营造和谐的校园风气具有重要的作用。文章论述了当代大学生手淫的根源、手淫危害、诱发因素、手淫动机及预防、矫治措施。 相似文献
45.
Parental alcoholism and early child development 总被引:2,自引:0,他引:2
In a cohort of 532 pregnant women from the general population, it was found by compilation of the results from interviews, police records, hospital records and social welfare records that 23 mothers and 51 fathers in 64 families (12%) were suffering from alcoholism/heavy drinking. In these 64 families, the mother was an addict in only 13 families, both parents were addicts in 10 families, and in the remaining 41 families only the father was an addict. Pregnancy, delivery, the newborn child and the child's development until their fourth year of life have been described using a multidisciplinary approach and a longitudinal prospective design. An hypothesis on mental and physical development, and the occurrence of psychopathological symptoms in the children was tested. None of the children of the 13 alcoholic mothers was born with foetal alcohol syndrome, but foetal hazard was indicated by lower birth weight and a higher rate of perinatal deaths. Children of alcoholic parents had retarded mental development and showed more behavioural problems until 4 years of age than controls, but the differences related to physical development during the first year of life had then disappeared. Boys were found to be more vulnerable than girls. The consequences of behaviour seemed to be more pronounced when both parents were alcoholics. No obvious deviation was found when only the father was addicted. Regarding mental development, it appears that factors related to parental alcoholism, including genetic and social factors, and the sex of the child, are of greater importance than the neonatal score on reduced optimality. 相似文献
46.
47.
Yifat Cohen Anthony Spirito Cheryl Sterling Deidre Donaldson Ronald Seifer Barry Plummer Ruscinda Avila Kathy Ferrer 《Journal of child psychology and psychiatry, and allied disciplines》1996,37(8):989-993
Adolescents who were psychiatrically hospitalized ( N = 105) were classified as sexually abused, physically abused, both sexually and physically abused, or not abused, and studied to determine the prevalence of suicidal behavior and psychiatric disorders. Self-reports of hopelessness, depression, coping, and self-concept were also examined. No difference in suicidal behavior or psychiatric disorder, based on abuse history, was found, with one exception. Adolescents who were sexually abused, particularly those who experienced the most severe sexual abuse, used negative coping strategies more often than those not sexually abused. Findings suggest that symptomatology of adolescents who are psychiatrically hospitalized does not differ markedly based on history of abuse. 相似文献
48.
Ellert R. S. Nijenhuis Philip Spinhoven Richard van Dyck Onno van der Hart Johan Vanderlinden 《Journal of traumatic stress》1998,11(4):711-730
In this study, the prevalence and severity of traumatic experiences as reported by patients with dissociative disorders and with other DSM-IV psychiatric diagnoses were compared. Furthermore, the predictive value of emotional, physical, and sexual trauma with respect to somatoform and psychological dissociation was analyzed. In contrast with comparison patients, dissociative disorder patients reported severe and multifaceted traumatization. Physical and sexual trauma predicted somatoform dissociation, sexual trauma predicted psychological dissociation as well. According to the memories of the dissociative disorder patients, this abuse occurred in an emotionally neglectful and abusive social context. Pathological dissociation was best predicted by early onset of reported intense, chronic and multiple traumatization. Methodological limitations restricting causal inferences between reported trauma and dissociation are discussed. 相似文献
49.
The purpose of this study was to assess, in subjects with low back pain, the changes and their permanence in muscular performance after a 3 month progressive physical exercise program. Ninety subjects with chronic low back pain participated in the study. The study design was controlled and it was carried out in three groups: intensive training, home exercise, and control group. Isometric and dynamic muscle strength of the trunk and lower limb were measured, at the beginning of the study and after the 3 months exercise program, and then during each of the follow-up sessions. The Oswestry Index and back pain intensity were also determined. Both exercise groups received benefit from the progressive exercise program. Their muscular performance improved and their back pain intensity decreased significantly. Among the home exercise group, the Oswestry Index also changed positively. The results demonstrate that the home exercise program could be as effective as the intensive training program in increasing muscle strength, as well as decreasing back pain and functional disability among low back pain patients with mild functional limitations. 相似文献
50.
S. N. Sarbadhikari 《Medical engineering & physics》1995,17(8):579-582
The use of an artificial neural network (ANN) system to differentiate the EEG power density spectra in depressed from normal rats was tried. The beneficial effects of chronic physical exercise in reducing the effects of stress and therefore depression was also to be tested in animals by the same method. In this study, rats were divided into 4 groups, subjected to (i) chronic stress (D group); (ii) chronic exercise by treadmill running (EO group); (iii) exercise with stress (ES group) and (iv) handling (C group). The prefrontal cortical EEG, EMG and EOG were recorded simultaneously on paper and the digitized EEG signals were also stored in the hard-disk of a PC-AT through an ADC. After filtering the digitize signals, the EEG power spectra were calculated by an FFT routine. Three successive 4 s artefact-free epochs were averaged. The REM and NREM sleep periods as well as the awake period signals were analyzed separately. The FFT values from each of the 3 states, in the 4 groups of animals were tested by an ANN with 30 first layer neurons and a 2nd layer of a majority-vote-taker. The ANN could distinguish the depressed from the normal rats' EEG very well in REM (99%) sleep, NREM (95%) sleep and awake (81%) states. In most of the cases it identified the exercised rats' EEG as normal. 相似文献