全文获取类型
| 收费全文 | 411篇 |
| 免费 | 85篇 |
| 国内免费 | 38篇 |
专业分类
| 534篇 |
出版年
| 2024年 | 7篇 |
| 2023年 | 9篇 |
| 2022年 | 18篇 |
| 2021年 | 33篇 |
| 2020年 | 33篇 |
| 2019年 | 21篇 |
| 2018年 | 15篇 |
| 2017年 | 23篇 |
| 2016年 | 24篇 |
| 2015年 | 20篇 |
| 2014年 | 21篇 |
| 2013年 | 43篇 |
| 2012年 | 27篇 |
| 2011年 | 36篇 |
| 2010年 | 27篇 |
| 2009年 | 24篇 |
| 2008年 | 16篇 |
| 2007年 | 32篇 |
| 2006年 | 29篇 |
| 2005年 | 12篇 |
| 2004年 | 20篇 |
| 2003年 | 7篇 |
| 2002年 | 10篇 |
| 2001年 | 4篇 |
| 2000年 | 6篇 |
| 1999年 | 3篇 |
| 1998年 | 6篇 |
| 1996年 | 2篇 |
| 1995年 | 1篇 |
| 1994年 | 1篇 |
| 1989年 | 1篇 |
| 1985年 | 3篇 |
排序方式： 共有534条查询结果，搜索用时 15 毫秒
221.
222.
H.W. Yang R.C. Wang X.G. Yuan R.D. Li J.Q. Wang M.J. Tan 《Philosophical Magazine Letters》2013,93(10):656-663
The effect of chamber gas pressure on the amorphicity of Al85Ni5Y10 alloy was studied for the melt-spinning process. The amorphicity of as-quenched ribbons was characterized by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The chamber atmosphere pressure is crucial to the cooling rate of melt spinning. At high vacuum, at pressure less than 0.001?atm, fully crystalline fragments are obtained. Monolithic amorphous ribbons were only obtained at a gas pressure of 0.1?atm, 0.2?atm or higher. The extended contact length between ribbons and the copper wheel contributes to the high cooling rate of melt spinning in Al-based glass forming alloys; that is supported by images recorded by a high-speed camera. Higher chamber pressure increases contact length between ribbons and the wheel, which is qualitatively elucidated by Bernoulli's equation. 相似文献
223.
分析手术室麻醉诱导后留置尿管产生尿路疼痛等不良反应的原因,探讨利多卡因凝胶在克服上述反应方面的作用及其他预防措施.采用方便取样将70例留置尿管的患者分为试验组和对照组,麻醉诱导后试验组在尿管上涂抹利多卡因凝胶(0.5ml/cm)后再按常规操作插管;对照组以石蜡油为润滑剂按常规操作留置尿管.比较两组患者心率、血压情况及躁动、疼痛评分.结果提示麻醉诱导后留置尿管可以有效减轻患者清醒状态下置管引起的尿路疼痛等问题,但不能避免患者苏醒期出现上述反应;使用利多卡因凝胶可有效预防患者苏醒期出现的尿路疼痛及其它不良反应,增加患者的舒适度. 相似文献
224.
Depression and dysphoria have been characterised by dampened positive emotional experiences. However, it remains unclear whether dysphoria is also characterised by dampened expectancies about positive emotional experiences. In the present study, participants with (dysphoric group; n=36) and without (non-dysphoric group; n=36) dysphoria reported on their expected and actual emotional responses to winning and losing money in a computer task. Results showed the dysphoric group predicted and experienced less happiness and contentment after winning money than the non-dysphoric group. Results also showed the dysphoric group predicted and experienced as much negative emotion after losing money as the non-dysphoric group. Moreover, the dysphoric group predicted they would experience more happiness after winning money than they actually did, whereas the non-dysphoric group experienced as much happiness as they had predicted. Results suggest that disturbances in positive emotional responding are characteristic of people experiencing dysphoria. 相似文献
225.
Lei Zhou Yang‐Yang Zhang Zuo‐Jun Wang Li‐Lin Rao Wei Wang Shu Li Xingshan Li Zhu‐Yuan Liang 《决策行为杂志》2016,29(2-3):169-182
In the field of eye tracking, scanpath analysis can reflect the sequential and temporal properties of the cognitive process. However, the advantages of scanpath analysis have not yet been utilized in the study of risky decision making. We explored the methodological applicability of scanpath analysis to test models of risky decision making by analyzing published data from the eye‐tracking studies of Su et al. (2013); Wang and Li (2012), and Sun, Rao, Zhou, and Li (2014). These studies used a proportion task, an outcome‐matched presentation condition, and a multiple‐play condition as the baseline for comparison with information search and processing in the risky decision‐making condition. We found that (i) the similarity scores of the intra‐conditions were significantly higher than those of the inter‐condition; (ii) the scanpaths of the two conditions were separable; and (iii) based on an inspection of typical trials, the patterns of the scanpaths differed between the two conditions. These findings suggest that scanpath analysis is reliable and valid for examining the process of risky decision making. In line with the findings of the three original studies, our results indicate that risky decision making is unlikely to be based on a weighting and summing process, as hypothesized by the family of expectation models. The findings highlight a new methodological direction for research on decision making. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
226.
采用问卷法以在校大学生为研究对象,研究自我监控与自我设限的相关关系。提出理论假设,即大学生群体在社会交际过程中自我监控越高的人更可能倾向于采取自我设限的保护策略。结果显示,自我监控与自陈式自我设限存在显著相关,但是与行动式自我设限没有相关。这表明在大学生群体中,自我监控对自我设限存在一定的预测和干预作用。 相似文献
227.
Improvements in the fatigue resistance of a nickel-based alloy have been achieved via a surface nanocrystallization and hardening (SNH) process. The enhanced fatigue resistance is related to the surface nanocrystallization, work hardening, and compressive residual stresses induced by the SNH process. 相似文献
228.
视觉素养是"读图"时代人们的基本文化素养,鉴于医学影像学的特点和要求,影像诊断学专业学生必须拥有良好的视觉素养.本文从视觉素养概念、视觉基本理论以及视觉素养培养的策略等方面探索了视觉素养与读片技能的整合.作者建议在影像诊断学中,应讲授有关视觉素养的基本知识. 相似文献
229.
230.
行为抑制型儿童相较于普通儿童更容易在童年中期和青春期出现心理障碍, 具有更高的发展风险性。此类儿童比非抑制型儿童表现出更多的退缩动机、更长的预期过程与前注意过程、更少的注意控制、对负性信息更多的注意偏向、异常活跃的反应监控过程和更慢的习惯化过程。这些与心理障碍患者相似的认知神经过程是儿童行为抑制性与心理障碍间的重要联系途径, 并能作为预测指标筛选有更高发展风险性的个体。除儿童本身的特质外, 环境因素也能通过塑造认知神经过程, 进而影响儿童的发展结果。因此在未来的研究中, 可以考虑不同文化背景下的儿童行为抑制性与心理障碍关联的认知神经过程差异。进而从个体特质和环境因素两方面寻找行为抑制型儿童发展的保护性因素。 相似文献