Effects of COVID-19 Outbreak on Children’s Mental Health: A Comparative Study with Children Diagnosed and Isolated from Their Parents

Ş,enay Kılınç,el,Feray Tarımtay Altun,Ö,zgecan Nuryü,z,Ezgi Tan,Erkal Erzincan,Oğ,uzhan Kılınç,el,Esra Yazıcı,Muhammed Ayaz 대한신경정신의학회 2021 PSYCHIATRY INVESTIGATION Vol.18 No.2

Objective The COVID-19 outbreak has negatively affected children in many ways. This study aimed to compare the psychological responses of children exposed to different levels of stress during the COVID-19 outbreak. Methods The anxiety levels, negative thoughts, and quality of life of COVID-19-positive children with COVID-19-positive parents (Child+ group, n=17), COVID-19-negative children who are separated from COVID-19-positive parents (Parent+ group, n=59), and a control group (n=64) were compared. The participants completed the Screen for Child Anxiety and Related Disorders (SCARED), Children’s Negative Cognitive Errors Questionnaire (CNCEQ), and Pediatric Quality of Life Inventory (PedsQL). Results The statistical analysis revealed that the Parent+ group recorded higher SCARED and CNCEQ scores and lower PedsQL scores in comparison with the control group. No statistically significant difference was found between the scores of the Child+ and control groups. Furthermore, high CNCEQ scores and low PedsQL scores in the Parent+ group predicted an increase in their SCARED scores. Conclusion Our study indicates that separating children from their parents during the COVID-19 outbreak negatively influences their mental health and increases their anxiety levels.

Moving-load dynamic analysis of AFG beams under thermal effect

Ş.D. Akbaş 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.42 No.5

In presented paper, moving load problem of simply supported axially functionally graded (AFG) beam is investigated under temperature rising based on the first shear beam theory. The material properties of beam vary along the axial direction. Material properties of the beam are considered as temperature-dependent. The governing equations of problem are derived by using the Lagrange procedure. In the solution of the problem the Ritz method is used and algebraic polynomials are used with the trivial functions for the Ritz method. In the solution of the moving load problem, the Newmark average acceleration method is used in the time history. In the numerical examples, the effects of material graduation, temperature rising and velocity of moving load on the dynamic responses ofAFG beam are presented and discussed.

Dynamic analysis of axially functionally graded porous beams under a moving load

Ş.D. Akbaş 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.39 No.6

In presented paper, moving load problem of functionally graded beams is investigated with porosity effects based on the first shear beam theory. The material properties of beam vary along the axial direction. The porosity is depicted by two different distributions along axial direction. The governing equations of problem are derived by using the Lagrange procedure. In the solution of the problem the Ritz method is used and algebraic polynomials are used with the trivial functions for the Ritz method. In the solution of the moving load problem, the Newmark average acceleration method is used in the time history. In the numerical examples, the effects of material graduation, porosity distribution, porosity coefficients and velocity of moving load on the dynamic responses of axially functionally graded beam are presented and discussed. The dynamic responses are obtained for different boundary conditions.

Size dependent vibration of laminated micro beams under moving load

Ş.D. Akbaş 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.46 No.2

The goal of this paper is to investigate dynamic responses of simply-supported laminated micro beams under moving load. In the considered micro-scale problem, the modified coupled stress theory which includes the length scale parameter is used. The governing equations of problem are derived by using the Lagrange procedure. In the solution of the problem the Ritz method is used and algebraic polynomials are used with the trivial functions for the Ritz method. In the solution of the moving load problem, the Newmark average acceleration method is used in the time history. In the numerical examples, the effects of stacking sequence of laminas, fibre orientation angles and the length scale parameter on the dynamic responses of laminated micro beams are examined and discussed.

Effect of Partial Replacement of Soybean and Corn with Dietary Chickpea (Raw, Autoclaved, or Microwaved) on Production Performance of Laying Quails and Egg Quality

Ahmet Yusuf Ş,engü,l,Sü,leyman Ç,aliş,lar 한국축산식품학회 2020 한국축산식품학회지 Vol.40 No.3

This study was conducted to investigate whether adding different levels of raw or differently processed chickpea into different diets of laying quails affected live weight, feed intake, feed efficiency, egg weight and internal and external egg quality. Chickpea was used as raw, autoclaved or microwave-processed, and it was involved in the diets on two different levels (20% and 40%). The sample was divided into 7 groups including the control, 20% and 40% raw, 20% and 40% autoclaved, and 20% and 40% microwaveprocessed groups. 336 ten-week-old female laying quails were used in the study, and the experiment continued for 19 weeks. In the study, the differences among the groups were insignificant in terms of live weight, feed intake, feed efficiency, egg weight and egg quality characteristics such as shell thickness, shell weight, yolk weight, yolk color and albumin index. The differences were significant in terms of the shape index, Haugh unit (p<0.05) and yolk index (p<0.01). Consequently, it was observed that different thermal processes on chickpeas did not usually have a significant effect on the yield performance of the quails, and the results that were obtained were similar to the other groups. However, it was determined that some egg quality characteristics were affected by the autoclaving and microwaving processes. Between the thermal processes, it may be stated that autoclaving provided better results.

Nonlinear thermal vibration of FGM beams resting on nonlinear viscoelastic foundation

M. Alimoradzadeh,Ş.D. Akbaş 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.44 No.4

Nonlinear free vibration analysis of a functionally graded beam resting on the nonlinear viscoelastic foundation is studied with uniform temperature rising. The non-linear strain-displacement relationship is considered in the finite strain theory. The governing nonlinear dynamic equation is derived based on the finite strain theory with using of Hamilton’s principle. The Galerkin’s decomposition technique is utilized to discretize the governing nonlinear partial differential equation to nonlinear ordinary differential equation and then is solved by using of multiple time scale method. The influences of temperature rising, material distribution parameter, nonlinear viscoelastic foundation parameters on the nonlinear free response and phase trajectory are investigated. In this paper, it is aimed that a contribution to the literature for nonlinear thermal vibration solutions of a functionally graded beam resting on the nonlinear viscoelastic foundation by using of multiple time scale method.

Nonlinear dynamic behavior of functionally graded beams resting on nonlinear viscoelastic foundation under moving mass in thermal environment

M. Alimoradzadeh,Ş.D. Akbaş 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.81 No.6

The aim of this paper is to investigate nonlinear dynamic responses of functionally graded composite beam resting on the nonlinear viscoelastic foundation subjected to moving mass with temperature rising. The non-linear strain-displacement relationship is considered in the finite strain theory and the governing nonlinear dynamic equation is obtained by using the Hamilton’s principle. The Galerkin’s decomposition technique is utilized to discretize the governing nonlinear partial differential equation to nonlinear ordinary differential equation and then the governing equation is solved by using of multiple time scale method. The influences of temperature rising, material distribution parameter, nonlinear viscoelastic foundation parameters, magnitude and velocity of the moving mass on the nonlinear dynamic responses are investigated. Also, the buckling temperatures of the functionally graded beams based on the finite strain theory are obtained.

Thermal nonlinear dynamic and stability of carbon nanotube-reinforced composite beams

M. Alimoradzadeh,Ş.D. Akbaş 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.46 No.5

Nonlinear free vibration and stability responses of a carbon nanotube reinforced composite beam under temperature rising are investigated in this paper. The material of the beam is considered as a polymeric matrix by reinforced the single-walled carbon nanotubes according to different distributions with temperature-dependent physical properties. With using the Hamilton’s principle, the governing nonlinear partial differential equation is derived based on the Euler-Bernoulli beam theory. In the nonlinear kinematic assumption, the Von Kármán nonlinearity is used. The Galerkin’s decomposition technique is utilized to discretize the governing nonlinear partial differential equation to nonlinear ordinary differential equation and then is solved by using of multiple time scale method. The critical buckling temperatures, the nonlinear natural frequencies and the nonlinear free response of the system is obtained. The effect of different patterns of reinforcement on the critical buckling temperature, nonlinear natural frequency, nonlinear free response and phase plane trajectory of the carbon nanotube reinforced composite beam investigated with temperature-dependent physical property.

Nonlinear free vibration analysis of a composite beam reinforced by carbon nanotubes

M. Alimoradzadeh,Ş.D. Akbaş 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.46 No.3

This investigation presents nonlinear free vibration of a carbon nanotube reinforced composite beam based on the Von Kármán nonlinearity and the Euler-Bernoulli beam theory The material properties of the structure is considered as made of a polymeric matrix by reinforced carbon nanotubes according to different material distributions. The governing equations of the nonlinear vibration problem is delivered by using Hamilton’s principle and the Galerkin’s decomposition technique is utilized to discretize the governing nonlinear partial differential equation to nonlinear ordinary differential equation and then is solved by using of multiple time scale method. The nonlinear natural frequency and the nonlinear free response of the system is obtained with the effect of different patterns of reinforcement.

Nonlinear dynamic and stability of a beam resting on the nonlinear elastic foundation under thermal effect based on the finite strain theory

M. Alimoradzadeh,Ş.D. Akbaş,S.M. Esfrajani 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.80 No.3

Nonlinear free vibration and thermal buckling of a beam resting on nonlinear are investigated in this study. In the nonlinear kinematic relations, the finite strain theory is used with Euler-Bernoulli and Hamilton’s principle is employed to derive the nonlinear governing of motion. The Galerkin’s method is applied to simplify the governing nonlinear partially differential equation to the nonlinear ordinary differential equation. In addition, He's variational method is employed to obtain an analytical expression for the nonlinear natural frequency and thermal buckling temperature. In this study, a comparison between the finite strain theory and the von Kármán Theory is presented and the results shows that the finite strain theory gives more accurate results than the von Kármán Theory for nonlinear natural frequency and thermal buckling temperature. In the numerical results, the effect of different parameters such as linear and nonlinear coefficients of the elastic foundation, boundary conditions and the amplitude of the oscillation on the thermal buckling temperature and the nonlinear natural frequency investigated.