本文详细介绍了认知过程中反应时实验的最新进展—“速度与准确率分离技术”(SAD).对其实验方法和理论基础作了全面的介绍,并与传统的 RT 实验和速度与准确率权衡的范式(SAT)进行比较.这种技术避免了 SAT 范式中实验方法的缺陷,能更为...本文详细介绍了认知过程中反应时实验的最新进展—“速度与准确率分离技术”(SAD).对其实验方法和理论基础作了全面的介绍,并与传统的 RT 实验和速度与准确率权衡的范式(SAT)进行比较.这种技术避免了 SAT 范式中实验方法的缺陷,能更为全面地揭示人类信息加工过程的动态特征,为解决目前关于信息加工的离散模型和连续模型的争论提供了一种新的手段和方法.展开更多
A model of damage to fresh concrete in a corrosive sulphate environment was formulated to investigate how and why the strength of corroded concrete changes over time. First, a corroded concrete block was divided into ...A model of damage to fresh concrete in a corrosive sulphate environment was formulated to investigate how and why the strength of corroded concrete changes over time. First, a corroded concrete block was divided into three regions: an expanded and dense region; a crack-development region; and a noncorroded region. Second, based on the thickness of the surface corrosion layer and the rate of loss of compressive strength of the corroding region, a computational model of the concrete blocks' corrosion-resistance coefficient of compressive strength in a sulphate environment was generated. Third, experimental tests of the corrosion of concrete were conducted by immersing specimens in a corrosive medium for 270 d. A comparison of the experimental results with the computational formulae shows that the calculation results and test results are in good agreement. A parameter analysis reveals that the corrosion reaction plays a major role in the corrosion of fresh concrete containing ordinary Portland cement,but the diffusion of the corrosion medium plays a major role in the corrosion of concrete mixtures containing fly ash and sulphate-resistant cement. Fresh concrete with a high water-to-cement ratio shows high performance during the whole experiment process whereas fresh concrete with a low water-to-cement ratio shows poor performance during the late experiment period.展开更多
文摘本文详细介绍了认知过程中反应时实验的最新进展—“速度与准确率分离技术”(SAD).对其实验方法和理论基础作了全面的介绍,并与传统的 RT 实验和速度与准确率权衡的范式(SAT)进行比较.这种技术避免了 SAT 范式中实验方法的缺陷,能更为全面地揭示人类信息加工过程的动态特征,为解决目前关于信息加工的离散模型和连续模型的争论提供了一种新的手段和方法.
基金Project(51078176) supported by the National Natural Science Foundation of ChinaProject(JK2010-58) supported by the Construction Science and Technology Research Project in Gansu Province,China
文摘A model of damage to fresh concrete in a corrosive sulphate environment was formulated to investigate how and why the strength of corroded concrete changes over time. First, a corroded concrete block was divided into three regions: an expanded and dense region; a crack-development region; and a noncorroded region. Second, based on the thickness of the surface corrosion layer and the rate of loss of compressive strength of the corroding region, a computational model of the concrete blocks' corrosion-resistance coefficient of compressive strength in a sulphate environment was generated. Third, experimental tests of the corrosion of concrete were conducted by immersing specimens in a corrosive medium for 270 d. A comparison of the experimental results with the computational formulae shows that the calculation results and test results are in good agreement. A parameter analysis reveals that the corrosion reaction plays a major role in the corrosion of fresh concrete containing ordinary Portland cement,but the diffusion of the corrosion medium plays a major role in the corrosion of concrete mixtures containing fly ash and sulphate-resistant cement. Fresh concrete with a high water-to-cement ratio shows high performance during the whole experiment process whereas fresh concrete with a low water-to-cement ratio shows poor performance during the late experiment period.
