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   7401篇
  免费   849篇
  国内免费   41篇
耳鼻咽喉   33篇
儿科学   2130篇
妇产科学   53篇
基础医学   759篇
口腔科学   249篇
临床医学   416篇
内科学   871篇
皮肤病学   128篇
神经病学   806篇
特种医学   44篇
外科学   182篇
综合类   204篇
现状与发展   3篇
一般理论   1篇
预防医学   1424篇
眼科学   92篇
药学   131篇
  2篇
中国医学   34篇
肿瘤学   729篇
  2024年   36篇
  2023年   178篇
  2022年   208篇
  2021年   294篇
  2020年   333篇
  2019年   381篇
  2018年   347篇
  2017年   302篇
  2016年   297篇
  2015年   266篇
  2014年   400篇
  2013年   605篇
  2012年   418篇
  2011年   305篇
  2010年   265篇
  2009年   277篇
  2008年   309篇
  2007年   262篇
  2006年   264篇
  2005年   229篇
  2004年   223篇
  2003年   199篇
  2002年   196篇
  2001年   156篇
  2000年   160篇
  1999年   124篇
  1998年   126篇
  1997年   132篇
  1996年   123篇
  1995年   92篇
  1994年   87篇
  1993年   95篇
  1992年   60篇
  1991年   67篇
  1990年   42篇
  1989年   60篇
  1988年   48篇
  1987年   44篇
  1986年   37篇
  1985年   33篇
  1984年   30篇
  1983年   18篇
  1982年   33篇
  1981年   28篇
  1980年   18篇
  1979年   24篇
  1978年   17篇
  1977年   9篇
  1976年   14篇
  1975年   9篇
排序方式: 共有8291条查询结果,搜索用时 31 毫秒
71.
目的 研究儿童期创伤焦虑障碍大学生接受人际心理治疗(IPT)的效果。方法 将某高校心理健康咨询中发现的、符合研究标准的48例焦虑障碍大学生用抛币法随机分组,治疗组25例和对照组23例,对治疗组实施IPT,在入组时和治疗结束后分别对患者进行焦虑自评量表(SAS)、功能大体评定量表(GAF)、心理弹性量表(CD-RISC)、不安全感心理自评量表(SRFIS)和抑郁症状清单评估。结果 治疗因素和时间因素分别对焦虑自评分、抑郁清单总分、大体功能分、心理不安全感分和心理弹性分存在主效应作用(F=7.407~295.961,P<0.05),且治疗因素和时间因素存在交互作用(F=5.262~81.958,P<0.05)。相关分析发现,治疗后抑郁清单总分减少值、焦虑自评分减少值、大体功能分增加值分别与治疗后心理不安全感减少值、心理弹性分增加值呈正相关(r=0.456~0.894,P<0.05)。结论 IPT能够改善48名儿童期创伤焦虑障碍患者的焦虑抑郁症状和心理社会功能,病情的改善程度与患者心理不安全感的减轻和心理复原力的增强有关。  相似文献   
72.
儿童早期发展对个人成年时期,乃至老年阶段的全面发展和健康促进均具有重要意义,受到越来越多的社会关注。本文从早期教育中运动能力培养的角度,总结其对儿童早期体格生长、智力发展、神经心理发育的作用及对特殊儿童疾病干预的影响,为促进儿童健康成长寻找途径和方向。  相似文献   
73.
BackgroundObesity is a growing global health concern, and those with a developmental disorder are at particular risk. Elevated levels of childhood trauma, placement breakdowns and obesity have been documented in the developmental disorder population, yet their relative associations remain unclear.ObjectiveA previous study (Morris et al., 2020) highlighted a high prevalence of adverse childhood experiences (ACEs) and obesity in adolescents with developmental disorders residing in a secure inpatient setting. The current cross-sectional study sought to further explore the prevalence of placement breakdowns and its relationship with Body Mass Index (BMI) in this sample.MethodsSecondary analysis was conducted on existing data for 34 adolescents, aged 10–17 years at admission, held in a secure mental health hospital developmental disorder service in the United Kingdom (UK) under the Mental Health Act.ResultsAlmost half of participants had experienced a placement breakdown (47.1%), the majority of whom typically experienced multiple breakdowns (M = 3.94, SD = 2.14). Placement breakdowns significantly predicted BMI and had a predictive effect that was independent to and above that of ACEs.ConclusionsPlacement breakdowns significantly contribute to risk for obesity, above that explained by early adversity. Those who have experienced placement breakdowns have a greater risk for obesity, irrespective of their level of exposure to ACEs. A history of previous placement breakdowns may act as a red flag for obesity.  相似文献   
74.
Childhood obesity has increased worldwide over the past four decades. This quasi-experimental study aimed to assess the effectiveness of a multicomponent and multilevel school-based intervention (POIBA) at 3 years of follow-up. The nutrition intervention focused on food groups, food pyramid, nutrients, portions, and balanced menus. In total, 3624 children participated in the study. Anthropometric measurements and information on food frequency and behavior, physical activity, and daily screen use were collected in the intervention (IG) and comparison group (CG). Positive unadjusted changes toward adherence to recommendations were found for water, meat, sweets, and fried potato consumption, proper breakfast, not having dinner in front of the TV, out-of-school physical activity, and daily screen use. Three scores were used to calculate the proportion of children making more than one change to improve healthy habits regarding physical activity (global Activity score), nutrition (global Nutrition score), and both (global score). Students exposed to the intervention had a significantly better global Activity score (16.2% IG vs. 11.9% CG; p = 0.012) and Global score (63.9% IG vs. 58.5% CG; p = 0.025). Intervention effects on obesity incidence at 3-year follow-up lost significance but maintained the positive trend. In conclusion, school-based interventions including a family component could be useful to address the childhood obesity problem.  相似文献   
75.
Childhood overweight and obesity prevalence has risen dramatically in the past decades, and family-based interventions may be an effective method to improve children’s eating behaviors. This study aimed to evaluate the effectiveness of three different family-based interventions: group-based, individual-based, or by website approach. Parents and school aged overweight or obese children, 8–12 years of age, were eligible for the study. A total of 115 children were randomly allocated in one of the three interventions, and 91 completed the study (79% compliance); Group 1 (n = 36) received group-based interventions by various experts; Group 2 (n = 30) had interpersonal family meetings with a dietitian; and Group 3 (n = 25) received training through a specifically developed website. Anthropometric, dietary, physical activity, and screen time outcomes were measured at baseline and at the end of the study. Within-group comparisons indicated significant improvement in body weight, body mass index (BMI)-z-score, physical activity, and screen time from baseline in all three study groups (p < 0.05). Furthermore, total body fat percentage (%TBF) was also decreased in Groups 2 and 3. Between-group differences varied with body weight and %TBF change, being larger in Group 3 compared to Groups 1 and 2, in contrast to BMI-z-score, screen time, and health behaviors, which were significantly larger in Group 2 than the other two groups. In conclusion, personalized family-based interventions are recommended to successfully improve children’s lifestyle and body weight status.  相似文献   
76.
BackgroundNationally, approximately one-third of early childhood education centers participating in the Child and Adult Care Food Program (CACFP) are independently owned and operated (ie, not owned by a corporation, not affiliated with Head Start, and with no food program sponsor). Independent providers are less likely to meet CACFP standards and best practices and would benefit from additional support and technical assistance.ObjectiveTo explore independent early childhood education center key informants’ (KIs) (ie, directors or relevant staff) perspectives on implementing the revised CACFP standards.DesignFollowing qualitative exploratory design, semistructured, in-depth, telephone interviews were conducted with KIs individually.Participants/settingIn summer 2018, 30 randomly sampled KIs from independent CACFP-participating early childhood education centers serving children ages 2 to 5 years nationwide were interviewed. Participants were sampled from respondents to a previously completed nationwide survey of providers.Main outcomesKIs’ perspectives on the CACFP program and revised meal pattern standard implementation.Analysis performedAfter audio recordings were professionally transcribed and reviewed, constant comparative analysis was conducted using Atlas.ti v8 qualitative software (Atlas.ti. version 8 for Windows, 2018, Scientific Software Development GmbH).ResultsKIs indicated that program benefits (eg, health and nutrition benefits, reimbursement, guidelines, and training) outweighed challenges experienced. Challenges associated with revised CACFP standards implementation (eg, availability or acceptability of new, creditable foods) were impacted by enhanced CACFP standards status, reported revised standards, and availability or utilization of outside support. KIs desired more contact with their state representative. KIs found the training and technical assistance on the revised standards useful and suggestions to enhance future training and technical assistance (eg, increasing accessibility, training resources, and audience-specific training).ConclusionsOverall, KIs desired additional resources, training, and increased communication from CACFP state representatives specific to CACFP-approved and reimbursable products, menu ideas, recipes, and cooking demonstrations. The present study suggests that a more tailored training and technical assistance approach is necessary as reported benefits, challenges, and program needs varied based on state-enhanced CACFP standards, reported familiarity with the revised meal pattern, and reported outside support.  相似文献   
77.
儿童期肥胖增加血脂异常、高血压、高血糖等心血管代谢风险(CMR),并可持续至成人,使代谢性疾病低龄化。近年发现,尿酸、视黄醇结合蛋白4、维生素D、颈围等与肥胖儿童CMR密切相关,可作为CMR的预警指标,为心血管代谢疾病的早期防治提供新靶标。认识预警指标与代谢风险的关系、作用机制和临床意义,有助于早期识别有CMR相关因素的高危人群并进行干预。  相似文献   
78.
PurposeThe main objectives of this study were to determine (1) whether family communication and school connectedness offer protection against suicidal behaviors in the presence of adverse childhood experiences (ACEs; direct protective effect) and (2) whether family communication or school connectedness buffer the association between ACEs and suicidal behaviors (interacting protective effect) on the multiplicative and additive scales.MethodsData were obtained from a western state's 2019 Youth Risk Behavior Survey that included 5,341 middle school and 4,980 high school participants. Generalized linear models were used to estimate whether family communication and school connectedness offered direct protection against suicidal behaviors or buffered the association between ACEs and suicidal behaviors using adjusted prevalence ratios and corresponding 95% confidence intervals.ResultsFamily communication and school connectedness offered direct protection against suicidal behaviors in the presence of ACEs (a 1-unit higher score was associated with a 32%–42% lower prevalence of suicidal behaviors for middle school youth and a 27%–39% lower prevalence of suicidal behaviors for high school youth). There was evidence that family communication and school connectedness buffered the association between ACEs and suicidal behaviors on the multiplicative scale.ConclusionsThe findings provide support for the development and implementation of interventions that build family communication and school connectedness to reduce suicidal behaviors. Furthermore, screening for trauma and suicidal behaviors is warranted.  相似文献   
79.
The objective of this study was to compare semen quality (sperm density, progressive motility and spermia) between long-term childhood cancer survivors and a control group of males. The second objective was to correlate the semen analysis of the survivors with cancer treatment and endocrine status. The semen quality of 143 survivors (median age, 23.6 years) was compared to 200 men (median age, 27.9 years) who had not been diagnosed with cancer. The cancer-related risk factors and gonadotrophin levels were compared. Overall, 65% of the survivors had abnormal semen analysis compared to 26.5% of the controls (p < 0.0001). Survivors with nonaspermia had lower sperm density than the controls (p < 0.001). Other observed correlations were not significant. Survivors who were treated with alkylating agents were more likely to have abnormal semen analysis (p < 0.008). Follicle-stimulating hormone and luteinising hormone levels were significantly elevated (p < 0.0001) in survivors with abnormal semen analysis. The semen quality parameters, except for low sperm density, did not differ in survivors with nonaspermia compared to the controls. The risk factors included treatment with alkylating agents. Elevated gonadotrophin levels correlated with abnormal semen analysis. All cancer survivors should be made aware of the possibility of suffering from cancer treatment-related infertility.  相似文献   
80.
Evaluated emotional distress, coping style, and marital adjustmentin 84 parents (42 couples) of children with cancer 2 monthsafter diagnosis and again about 20 months after diagnosis. Asexpected, mothers' mean state anxiety and trait anxiety scoresdecreased to near normal levels over time. Fathers' scores werelower initially and did not change. Neither mothers' nor fathers'mean marital adjustment scores changed over time. Marital adjustmentat treatment follow-up was predicted by depression and the spouse'smarital satisfaction in mothers, and depression, child healthstatus, and spouse's marital satisfaction in fathers. In contrastto findings obtained 2 months after diagnosis, coping stylewas not related to marital adjustment at follow-up. Resultsare discussed in terms of possible gender differences in therole of social support in marital adjustment and the stabilityversus situational specificity of coping styles.  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