Results 31 to 40 of about 18,171,804 (281)

Evaluating the psychometric properties of the fatigue severity scale using item response theory

open access: yesBMC Psychology, 2023
Background Fatigue is a common daily experience and a symptom of various disorders. While scholars have discussed the use of the Fatigue Severity Scale (FSS) using item response theory (IRT), the characteristics of the Japanese version are not yet ...
Seiji Muranaka   +2 more
doaj   +1 more source

A new sinusoidal shear deformation theory for bending, buckling, and vibration of functionally graded plates [PDF]

open access: yes, 2013
A new sinusoidal shear deformation theory is developed for bending, buckling, and vibration of functionally graded plates. The theory accounts for sinusoidal distribution of transverse shear stress, and satisfies the free transverse shear stress ...
Thai, Huu-Tai, Vo, Thuc
core   +1 more source

Nonlinear Vibration of a Functionally Graded Nanobeam Based on the Nonlocal Strain Gradient Theory considering Thickness Effect

open access: yesAdvances in Civil Engineering, 2020
In this work, a nonlocal strain gradient beam model considering the thickness effect is developed to study the nonlinear vibration response of a functionally graded nanobeam.
Dang-Van Hieu   +2 more
doaj   +1 more source

Impact perforation of sandwich panels with graded hollow sphere cores: Numerical and Analytical investigations [PDF]

open access: yesEPJ Web of Conferences, 2021
In this study, we numerically and analytically investigate the impact perforation of sandwich panels made of 0.8 mm 2024-T3 aluminum alloy skin sheets and graded polymeric hollow sphere cores with four different gradient profiles.
Elnasri Ibrahim
doaj   +1 more source

Buckling analysis of thin-walled functionally graded sandwich box beams [PDF]

open access: yes, 2015
Buckling analysis of thin-walled functionally graded (FG) sandwich box beams is investigated. Material properties of the beam are assumed to be graded through the wall thickness.
Lee, Jaehong   +7 more
core   +1 more source

Psychometric properties of Grit-S scale in university students: An application of the graded response model

open access: yesCogent Education, 2023
This study adopted an item response theory to evaluate the Grit-S scale and its dimensions (i.e., Consistency of interest [G-CI] and Perseverance of effort [G-PE]) among university students (N = 450) using two unidimensional Graded Response (GR ...
Amal Alhadabi
doaj   +1 more source

A new inverse trigonometric shear deformation theory for isotropic and functionally graded sandwich plates [PDF]

open access: yes, 2014
A new inverse trigonometric shear deformation theory is proposed for the static, buckling and free vibration analyses of isotropic and functionally graded (FG) sandwich plates.
Thai, Huu-Tai   +3 more
core   +1 more source

An application of item response theory to psychological test development

open access: yesPsicologia: Reflexão e Crítica, 2016
Item response theory (IRT) has become a popular methodological framework for modeling response data from assessments in education and health; however, its use is not widespread among psychologists. This paper aims to provide a didactic application of IRT
Cristian Zanon   +3 more
doaj   +1 more source

Item parameter estimations for multidimensional graded response model under complex structures

open access: yesFrontiers in Education, 2022
Item parameter recovery in the compensatory multidimensional graded response model (MGRM) under simple and complex structures with rating-scale item response data was examined.
Olasunkanmi James Kehinde   +2 more
doaj   +1 more source

Vibration and buckling analysis of functionally graded sandwich plates with improved transverse shear stiffness based on the first-order shear deformation theory [PDF]

open access: yes, 2014
An improved transverse shear stiffness for vibration and buckling analysis of functionally graded sandwich plates based on the first-order shear deformation theory is proposed in this paper.
Thai, Huu-Tai   +2 more
core   +1 more source

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