全文获取类型
收费全文 | 621篇 |
免费 | 52篇 |
国内免费 | 170篇 |
出版年
2024年 | 1篇 |
2023年 | 9篇 |
2022年 | 17篇 |
2021年 | 19篇 |
2020年 | 20篇 |
2019年 | 20篇 |
2018年 | 22篇 |
2017年 | 28篇 |
2016年 | 29篇 |
2015年 | 10篇 |
2014年 | 23篇 |
2013年 | 51篇 |
2012年 | 23篇 |
2011年 | 58篇 |
2010年 | 38篇 |
2009年 | 49篇 |
2008年 | 51篇 |
2007年 | 53篇 |
2006年 | 78篇 |
2005年 | 44篇 |
2004年 | 28篇 |
2003年 | 20篇 |
2002年 | 16篇 |
2001年 | 14篇 |
2000年 | 8篇 |
1999年 | 15篇 |
1998年 | 7篇 |
1997年 | 17篇 |
1996年 | 11篇 |
1995年 | 14篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1992年 | 5篇 |
1991年 | 4篇 |
1990年 | 4篇 |
1989年 | 6篇 |
1988年 | 2篇 |
1987年 | 5篇 |
1986年 | 4篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1979年 | 3篇 |
1971年 | 1篇 |
排序方式: 共有843条查询结果,搜索用时 15 毫秒
71.
运用广义回归神经网络(GRNN)方法对小样本多维项目反应理论(MIRT)补偿性模型的项目参数进行估计,尝试解决传统参数估计方法样本数量要求较大的问题。MIRT双参数Logistic补偿模型被设置为二级计分的二维模型。首先,模拟二维能力参数、项目参数值与考生作答矩阵。其次,把通过主成分分析得到的前两个因子在每个题目上的载荷作为区分度的初始值以及题目通过率作为难度的初始值,这两个指标的初始值作为神经网络的输入。集成100个神经网络,其输出值的均值作为MIRT的项目参数估计值。最后,设置2×2种(能力相关水平:0.3和0.7; 两种估计方法:GRNN和MCMC方法)实验处理,对GRNN和MCMC估计方法的返真性进行比较。结果表明,小样本的情况下,基于GRNN集成方法的参数估计结果优于MCMC方法。 相似文献
72.
Juncai Pu Xinyu Zhou Dan Zhu Xiaoni Zhong Lining Yang Haiyang Wang 《Psychology, health & medicine》2017,22(6):680-692
Women are an important part of the medical workforce, yet little is known about gender differences in psychological morbidity, burnout, job stress and job satisfaction among neurologists. This study assessed gender differences in a large national sample of Chinese neurologists. Multivariate analyses were performed to examine associations. A total of 5558 neurologists were included in the analysis. Compared with their male counterparts, female neurologists were generally younger; were less likely to be married or to have children; had higher levels of education; were in practice for a shorter period of time; were less likely to hold senior roles; and had lower incomes. Male and female neurologists worked similar hours and spent a similar number of nights on call. No gender differences were found in psychological morbidity, burnout, and high levels of job stress for female and male, respectively. Women had higher emotional exhaustion scores, while men were more likely to have low levels of job satisfaction. The multivariate analysis showed that factors independently associated with psychological morbidity, burnout, high levels of job stress and low levels of job satisfaction were generally similar for women and men. These findings increase our understanding of gender differences in psychological morbidity, burnout, job stress, and job satisfaction among neurologists. As more women join the medical profession, these differences may be useful in designing medical training and practice. 相似文献
73.
Qin Zhu Todd Mirich Shaochen Huang Winona Snapp-Childs Geoffrey P. Bingham 《Attention, perception & psychophysics》2017,79(6):1830-1840
Many studies have shown that rhythmic interlimb coordination involves perception of the coupled limb movements, and different sensory modalities can be used. Using visual displays to inform the coupled bimanual movement, novel bimanual coordination patterns can be learned with practice. A recent study showed that similar learning occurred without vision when a coach provided manual guidance during practice. The information provided via the two different modalities may be same (amodal) or different (modality specific). If it is different, then learning with both is a dual task, and one source of information might be used in preference to the other in performing the task when both are available. In the current study, participants learned a novel 90° bimanual coordination pattern without or with visual information in addition to kinesthesis. In posttest, all participants were tested without and with visual information in addition to kinesthesis. When tested with visual information, all participants exhibited performance that was significantly improved by practice. When tested without visual information, participants who practiced using only kinesthetic information showed improvement, but those who practiced with visual information in addition showed remarkably less improvement. The results indicate that (1) the information is not amodal, (2) use of a single type of information was preferred, and (3) the preferred information was visual. We also hypothesized that older participants might be more likely to acquire dual task performance given their greater experience of the two sensory modes in combination, but results were replicated with both 20- and 50-year-olds. 相似文献
74.
Claire J. Starrs John R. Z. Abela David C. Zuroff Rhonda Amsel Josephine H. Shih Shuqiao Yao Xiong Zhao Zhu Wei Hong 《Journal of abnormal child psychology》2017,45(6):1207-1219
The current longitudinal study examined whether the personality vulnerabilities of self-criticism and dependency prospectively predicted stress generation in Chinese adolescents. Participants included 1,116 adolescents (588 girls and 528 boys), aged 15 to 18 years from rural, urban and ultra-urban mainland China. Participants completed self-report measures of personality, depressive and anxious symptoms and participated in a clinical interview assessing lifetime history of depression. The occurrence of negative life events was measured using a contextual-threat interview every 6-months for a total period of 18-months. Logistic regression analyses showed that after controlling for past depressive episodes and current depressive and anxious symptoms, self-criticism was prospectively associated with the occurrence of interpersonal stress generation, but not noninterpersonal stress generation. Dependency also predicted interpersonal stress generation, although only in girls and not boys. In line with previous Western findings, girls reported more interpersonal stress generation. Analyses across 3 levels of urbanization revealed several significant differences including higher reported interpersonal stress generation in urban girls than urban boys and overall higher levels of negative life events in ultra-urban youth. In sum, findings from the current study suggest that the stress generation process may be generalizable to Chinese youth. 相似文献
75.
研究目的:通过针对"相关线索-习惯性用药行为"联结的消退训练,降低渴求感,建立新联结,达到减弱或消退成瘾记忆的目的。探索以"动作消退动作"的方法对成瘾动作记忆进行消退的效果和可行性。方法:采用途径偏向矫正方法对28名男性药物成瘾者开展为期4周的训练。训练前后,分别测试渴求感、生理指标、途径偏向效应和Addiction-stroop task的干扰效应量,比较训练前后的指标变化,了解训练的效果。结果:训练组和对照组在训练前后的途径偏向效应没有显著的组间和交互效应,但训练组在训练前后途径偏向效应发生变化,趋向显著性,t=1.26,p=0.071。渴求感在训练组显著降低:t=1.38,p=0.05。Stroop的反应时间呈训练时间主效应:t=4.18,p=0.04。结论:途径偏向矫正消退训练可以改善成瘾者的途径偏向效应和渴求感状况,预示着通过身体动作建立"相关线索-拒绝用药行为"联结替代原有的"相关线索-自动化用药行为"联结,降低渴求感,减弱或消退成瘾记忆是有可能的。未来的研究需要采用更为精确的影像手段进行测试,验证基于动作认知的成瘾记忆消退训练的有效性。 相似文献
76.
快速启动范式(Sereno & Rayner, 1992)是一种基于呈现随眼动变化技术而设计的眼动范式,主要用于研究中央凹视野内字词识别的瞬时启动,通过精确控制启动条件和启动时窗,以考察词汇通达过程中词汇水平(如,词频、词长等)、亚词汇水平(如,语音、语义、字形等)信息的加工时序。本文从基本原理、设计基础、应用领域、注意事项等方面对快速启动范式进行了较为深入的解读和介绍,并结合已有的研究成果,指出了该范式在汉语阅读中的应用价值。 相似文献
77.
研究不同反应重复量对反应抑制后效应的影响。采用停止信号范式,让被试完成不同反应重复量的反应抑制任务。结果显示,总的来说反应重复量因素和重复类型因素的主效应都显著;信号抑制条件下重复一次后比重复三次后无信号试次反应时要显著地长,但都与总的无信号试次反应时没有显著差异;信号反应条件下重复三次后与重复一次后无信号试次反应时没有显著差异,但都比总的无信号试次反应时显著地长。结果表明,不同反应重复量反应抑制后效应在信号抑制条件下既有认知控制调整也有自动化记忆提取,在信号反应条件下仅存在认知控制的执行加工。 相似文献
78.
Gary J. Tedeschi Shu‐Hong Zhu Christopher M. Anderson Sharon Cummins Neil G. Ribner 《Journal of counseling and development : JCD》2005,83(4):416-424
Adolescent smokers need cessation help, but the question of how best to intervene remains unanswered. This article describes the empirically validated protocol of an established, well‐utilized adolescent telephone counseling program for smoking cessation, tailored to adolescent developmental needs and shown to increase clients' 6‐month prolonged abstinence rate significantly. Clinical issues addressed include client assessment, motivation, self‐efficacy, familial and social support, planning, coping, relapse‐sensitive call scheduling, and self‐image. Counselor training considerations are also discussed. 相似文献
79.
80.
一个基于综合印象评分法的作文分事后调整模型 总被引:4,自引:0,他引:4
对大学英语四、六级考试作文评分进行了详细的描述,重点介绍了作文分的事后调整的原理和方法,并且给出了一个基于线性等值原理的数学推导。认为其数学模型主要是一个运用了“极大似然估计法”和“正态分”概念的统计模型。“评分标准的制定”、“用参照样卷来校准阅卷员对作文评分标准的掌握尺度”以及“阅卷员的培训和考核”构成了大学英语四、六级考试作文信度的基石;而作文分调整中基于“随机分发作文卷”、“客观题分数与作文分相关”以及“评分前后一致性”的统计方法则对出现系统性误差的阅卷员的评分结果进行了事后的校正。还提出如果拥有往次考试总体作文分均值数据,使用“加权移动平均法”可以实现对作文分的跨考次平衡。 相似文献