题目难度分布和样本容量对两种CTT等值结果的影响

基于经典测验理论(CTT)的等值方法主要有线性等值和等百分位等值两种。在不同情境下,不同的等值方法会产生不同的等值结果。本研究以真分数等值为依据,用蒙特卡洛模拟研究方法,综合比较了各种题目难度分布条件下和各种样本容量条件下两种CTT等值方法的等值结果。研究结果表明:(1)线性等值的误差受题目难度分布影响较大,等百分位等值的误差几乎不受题目难度分布影响。(2)线性等值的误差几乎不受样本容量的影响,等百分位等值的误差受样本容量影响较大。(3)不论题目难度分布如何,只要样本容量足够大,等百分位等值的效果都比线性等值更好。     

4～8年级学生几何类比推理问题解决认知诊断

认知诊断是一种新的测量范式,有助于人们更好地了解人类内部心理活动规律及其加工机制,实现对个体认知强项和弱项的诊断评估,该研究采用HO-DINA对4～8年级学生的几何类比推理能力进行诊断评估。结果表明:1)4～8年级的学生对几何类比推理问题的掌握情况比较良好,其中对属性A1和A4掌握的比较理想,对属性A2掌握的比较差。同时七个认知属性存在年级差异,六年级是学生几何类比推理能力发展的最快时期;2)学生所犯的认知错误主要以"0000000"、"1111011"、"0001000"、"1011111"和"1001110"五种认知错误为主,占总认知错误的44.55%,而这些错误与属性A2和A5有关。     

Uncovering the Effects of Awe on Meaning in Life

Journal of Happiness Studies - Research on awe and meaning in life (MIL) is rare. In the current research, we conducted a pre-registered study to examine how awe influences MIL from the perspective...     

Exercise mode and executive function in older adults: An ERP study of task-switching

The purpose of this study was to investigate the relationship between exercise mode and executive function and its effect on behavior and neuroelectric activity. Forty-eight older adults were classified into open-skill, closed-skill, and irregular exercise groups based on their experience of exercise participation. Executive function was measured via a task-switching paradigm, in which the behavioral indices and event-related potentials elicited by task-switching were assessed. The results revealed that the exercise groups, regardless of the exercise mode, exhibited faster reaction times in both global and local switches than the irregular exercise group, regardless of the within-task conditions. Similarly, larger P3 amplitudes were observed in both exercise groups compared to the irregular exercise group. Moreover, additional facilitation effects of open-skill exercises on global switch costs were observed, whereas no differences in local switch costs were found among the three groups. The results replicate previous studies that have reported generally improved executive function after participation in exercises; additionally, they extend the current knowledge by indicating that these cognitive improvements in specific aspects of executive function could also be obtained from open-skill exercises.     

When waiting to choose increases patience

We explore how waiting to choose influences patience. We propose that waiting to make an intertemporal choice increases the assumed value of the items for which people are waiting, leading them to become more patient. Five studies support this model. Study 1 finds that after waiting to choose, people exhibit greater patience than if they had not waited or before they had started to wait. Studies 2a and 2b find that increased valuation (rather than decreased cost of the wait) mediates the impact of waiting on patience. Study 3 further finds that whereas waiting to choose increases preference for a larger-later (over smaller-sooner) item, it also increases willingness to pay to expedite delivery of a single item. Finally, study 4 shows the waiting effect is stronger for hedonic than for utilitarian products. These studies modify existing theory by identifying the conditions under which waiting to choose can improve patience.     

Enhanced fatigue resistance of a nickel-based hastelloy induced by a surface nanocrystallization and hardening process

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.     

Phase transitions of Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass at pressures up to 27 GPa

The phase transitions of Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5 bulk metallic glass have been investigated under high pressures and at room temperature. Direct resistance measurements in a diamond anvil cell provide evidence of a reversible transition between amorphous and crystalline phases; crystallization events occurred at 24 and 26.2 GPa on uploading, and crystalline-to-amorphous phase transitions were observed at 16 and 10.6 GPa on downloading. The phase transitions were confirmed by transmission electron microscopy observations.     

论艺术伦理的超道德性

如何认识艺术实践的伦理之维,事关对艺术意义的准确理解和对其审美功能的深度认识。伦理关系体现着人类的最终理想,而具体的道德规范只是人类实现其最终愿望的必要手段,仅仅遵循道德规范并不能实现人类的希望。艺术的伦理价值往往落实于对既成社会规范的挑战,而并非对时代道德习俗的循规蹈矩地遵守;艺术的伦理意义常常拥有一种超道德性。