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   223990篇
  免费   19624篇
  国内免费   4577篇
耳鼻咽喉   3312篇
儿科学   4530篇
妇产科学   3928篇
基础医学   17405篇
口腔科学   7919篇
临床医学   21625篇
内科学   23121篇
皮肤病学   2787篇
神经病学   10998篇
特种医学   6086篇
外国民族医学   11篇
外科学   21289篇
综合类   34541篇
现状与发展   13篇
一般理论   26篇
预防医学   30913篇
眼科学   2228篇
药学   21248篇
  345篇
中国医学   26137篇
肿瘤学   9729篇
  2024年   824篇
  2023年   4313篇
  2022年   8259篇
  2021年   10988篇
  2020年   10694篇
  2019年   12046篇
  2018年   10759篇
  2017年   9227篇
  2016年   8309篇
  2015年   7693篇
  2014年   15116篇
  2013年   16108篇
  2012年   13305篇
  2011年   14326篇
  2010年   11593篇
  2009年   10079篇
  2008年   9365篇
  2007年   9441篇
  2006年   8160篇
  2005年   6844篇
  2004年   5713篇
  2003年   5081篇
  2002年   3968篇
  2001年   3294篇
  2000年   2869篇
  1999年   2400篇
  1998年   1919篇
  1997年   1695篇
  1996年   1427篇
  1995年   1326篇
  1994年   1173篇
  1993年   1070篇
  1992年   959篇
  1991年   863篇
  1990年   755篇
  1989年   732篇
  1988年   688篇
  1987年   606篇
  1986年   557篇
  1985年   1808篇
  1984年   2082篇
  1983年   1306篇
  1982年   1723篇
  1981年   1203篇
  1980年   1024篇
  1979年   911篇
  1978年   741篇
  1977年   559篇
  1976年   698篇
  1975年   479篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
大隐静脉曲张微创外科治疗   总被引:5,自引:0,他引:5  
目的 总结外科微创方法治疗大隐静脉曲张的经验。方法 采用大隐静脉高位结扎微创剥脱术治疗 465例 ( 5 72条患肢 )及静脉腔内激光治疗 6例 ( 7条患肢 )下肢静脉曲张患者。结果 在 471例患者中 ,随访到 42 7例 ,随访率 90 .7% ,平均随访时间 3 .8年。结果显示手术创伤小、并发症少、复发率低 ( 1.41% )。结论 此两种微创手术操作简单、合理、易于掌握 ,且疗效理想 ,值得推广。  相似文献   
992.
目的改进传统的双环法在乳房缩小术、乳房悬吊术术后外形扁平,凸度不足,上极瘪陷,提升不够等缺点。方法采用双环切口。“扇”形分离、切除皮下部分脂肪,“楔”形切除适量的外上象限腺体,螺旋状旋转剩余腺体成圆锥状,将其固定在第2肋软骨膜上,矫正轻中度乳房肥大和下垂。结果术后随访20例患者1~3个月,乳房上极较丰满,形态好,乳头乳晕功能正常,切口瘢痕轻,乳房肥大和下垂的矫正获得了满意的效果。结论双环切口,螺旋状旋转剩余腺体成圆锥状,并固定于第2肋软骨膜上,可较好地塑形并悬吊乳房,其切口相对隐蔽,术后乳房高凸,上极略饱满,乳头微上翘,乳晕形态合适,是矫正轻中度乳房肥大下垂的一种较理想的术式。  相似文献   
993.
目的探讨第一、二鳃弓综合征面部不对称畸形的整形外科矫治方法。方法根据第一、二鳃弓综合征患者临床及X线所示面部双侧不对称情况,采用健侧下颌骨外板去除、颧骨截骨降低;患侧下颌体、颧骨应用健侧下颌骨外板贴附植骨或高密度多孔聚乙烯(Medpor)假体置入等术式,配合颏部水平截骨颏成形术,以缩小面部双侧宽度的差异,矫治颜面不对称畸形。结果共矫治23例,经6个月至3年的术后随访观察,双侧面部宽度差异明显缩小,正面观面部不对称明显改善。结论第一、二鳃弓综合征面部骨骼发育畸形是三维方向的,双侧面骨宽度的差异,是造成正面观面部不对称的重要因素,根据受术者的具体情况,采用以上术式的组合,扩充患侧或同时缩窄健侧骨骼,进行面部骨性支架重建,可以取得良好的矫治效果。  相似文献   
994.
Background   Respite care may act as a means to reduce stress and fatigue in people caring for a dependent who has a disability. Despite this, a variety of barriers may exist to obtaining such services. This study explored caregivers' experiences seeking respite care for their children with special needs within a province in Canada.
Methods   Caregivers were recruited from two agencies providing respite care for children with fetal alcohol spectrum disorders and other mental health and developmental difficulties. In total, 10 caregivers participated in in-depth individual interviews. A constructivist grounded theory approach was employed in the design and analysis of the data.
Results   Caregivers discussed their frustrations with the process of finding and obtaining respite care, a course of action described as 'jumping through hoops'. This construct was composed of subcategories emphasizing the complexity of 'navigating the system', the bidirectional process of 'meeting the requirements' and the challenges of 'getting help'.
Conclusions   The collective experiences of these caregivers point to the need for more flexibility and co-ordination of respite care services for children with special needs.  相似文献   
995.
浙江省温州市2004年结核病监测结果分析   总被引:3,自引:0,他引:3  
目的 通过分析温州市2004年结核病监测资料评价现行的防治措施效果.方法 收集并分析温州市2004年结核病监测报表.结果监测点涂阳新登记率为27.45/10万,其中流动人口为26.84/10万,流动人口病例涂阳比例(68.3%)明显高于总人口病例涂阳比例(45.9%),新登涂阳病例1年转归队列分析治愈率为86.6%.结论 提高涂阳病人的发现率依然是本地区结核病控制工作的重点,流动人口结核病问题不容忽视.  相似文献   
996.
The newborn are subject to the bond between infants and their caregivers. The newborn receives the imprint of a style of attachment of which the function involves “proximity-maintenance” and “separation-protest”. The “secure-base” uses the attachment as a base from which the newly born is able to explore his environment. The continuity between childhood and adult relationships changes when romantic love and sexual appetite appear. A new kind of attachment with the love partner must develop and it has to support both attachment and sexuality. The youngster produces the same secure, avoiding, ambivalent or confused attachment as when he was an infant but, as opposed to that with his family, when the young person is attached to his partner he doesn't want to leave. In order to assess the link between the attachment with caregivers and the attachment with the first love, we proposed a questionnaire, a kind of “Love quiz”. First, the representation of attachment with their parents was assessed by four columns of ten questions. Each question referred to a style of attachment, for instance at the end of the interview, the column asking questions about avoidance displayed seven answers, whereas the secure column showed only three answers and the confused only one. Later, the same questionnaire was submitted in order to describe the new attachment with the first love. Results showed that the commitment to romantic love was similar to those observed among infants. But, after a while, the scores obtained in each column evolved: Fourteen out of twenty symptomatic adolescents improved their secure score; three remained in the same style of attachment and three others felt their first love as a traumatism. Out of eighteen no-symptomatic adolescents, fourteen were secure. Only four were insecure. After the first love, the rate of insecure adolescents increased to eight; four others were traumatised. The first love probably sets up a sensitive period in which biology, emotion and culture converge to enable us to be imprinted by a partner. An affect regulation with romantic partners is negotiated like a transaction between two styles of attachment. What is surprising is that the population of insecure adolescents benefited more from romantic love than the secure population by increasing their score in the attachment style. Adult relationships can be understood in terms of attachment. The first attachment is acquired during early interactions, and when the beginnings of life are difficult the first love gives them a second chance.  相似文献   
997.
The aims were to investigate: (1) experiences of physical pain in elderly patients with hip fracture; (2) if background variables, confusion, experiences of pain and distress and interventions aimed at reducing pain and distress, functional ability, pain in the ambulance, and type of fracture varied between patients with more intense physical pain and patients with less intense physical pain. The sample included 49 patients, 70 years or older, with hip fracture. Structured instruments were used to interview and observe the patients on four occasions during the hospital stay. The patients’ experiences of physical pain decreased during the hospital stay. Physical pain at rest was lower than pain with movement. Patients who scored physical pain as more intense (group B) during the visit to the hospital had significantly more unfavourable experiences in the sensory, emotional, and existential dimensions the day before discharge from the hospital compared with the patients who scored pain as less intense (group A). The patients in group B perceived the interventions as less favourable than group A. Furthermore, group B had more intense physical pain in the ambulance than the patients in the other group. More patients in group B than in group A had additional health problems.  相似文献   
998.
腹腔镜下处理输卵管积水对体外受精胚胎移植结局的影响   总被引:3,自引:2,他引:1  
目的探讨腹腔镜下处理输卵管积水对体外受精胚胎移植(in vitro fertilization and embryo transfer, IVF-ET)结局的影响.方法 2002~2005年在我院行IVF-ET伴输卵管积水的53例分3个研究组:①未处理组17例,仅行IVF-ET,未对积水进行处理;②直接切除组17例,行IVF-ET术前在腹腔镜下处理输卵管积水;③失败后切除组19例,IVF-ET失败后腹腔镜下处理输卵管积水后再行IVF-ET.结果未处理组新鲜移植周期妊娠率15.8%(3/19),解冻周期妊娠率10.5%(2/19),平均周期妊娠率13.2%(5/38),累积活胎率17.6%(3/17);直接切除组分别为36.8%(7/19),23.1%(3/13),30.3%(10/32),41.7%(8/17);失败后切除组分别为16.7%(2/12),58.3%(14/24),44.4%(16/36),73.7%(14/19).失败后切除组的解冻周期妊娠率、平均周期妊娠率及累积活胎率均高于未处理组(χ2=10.374,P=0.001;χ2=8.903,P=0.003;χ2=11.305,P=0.001),直接切除组平均周期妊娠率及累积活胎率呈高于未处理组的趋势(χ2=3.377,P=0.066;χ2=3.360,P=0.067).结论输卵管积水降低IVF-ET的妊娠率,妊娠结局不良,腹腔镜下处理输卵管积水后再行IVF-ET提高妊娠率,获得良好的妊娠结局.  相似文献   
999.
目的:探讨国产吻合器痔上黏膜环切术(PPH)的并发症及应用价值。方法:总结吻合器痔上黏膜环切术治疗严重Ⅱ度、Ⅲ度、Ⅳ度痔病63例的临床资料。结果:手术时间10-20min,术后平均住院2~5d,无肛门狭窄、无肛门失禁、无复发等并发症。结论:国产痔吻合器是治疗重度痔的一种安全有效方法,创伤少,并发症少,价格低廉,有望替代传统的痔切除术。  相似文献   
1000.
目的探讨单丝聚丙烯合成非吸收齿状线在美容整形中的并发症产生的原因及应用方法及技术的改进。方法对近两年的单丝聚丙烯合成非吸收齿状线在美容整形中的应用进行总结与分析。结果改进应用方法后,并发症明显减少,效果加强。结论单丝聚丙烯合成非吸收齿状线在美容整形中应用得当,可减少并发症、取得显著效果。  相似文献   
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