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RISS 인기검색어
- 검색키워드
- 저자 : Mesut Simsek (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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Mesut Simsek 국제구조공학회 2011 Steel and Composite Structures, An International J Vol.11 No.1
Dynamic analysis of an embedded single-walled carbon nanotube (SWCNT) traversed by a moving nanoparticle, which is modeled as a moving load, is investigated in this study based on the nonlocal Timoshenko beam theory, including transverse shear deformation and rotary inertia. The governing equations and boundary conditions are derived by using the principle of virtual displacement. The Galerkin method and the direct integration method of Newmark are employed to find the dynamic response of the SWCNT. A detailed parametric study is conducted to study the influences of the nonlocal parameter, aspect ratio of the SWCNT, elastic medium constant and the moving load velocity on the dynamic responses of SWCNT. For comparison purpose, free vibration frequencies of the SWCNT are obtained and compared with a previously published study. Good agreement is observed. The results show that the above mentioned effects play an important role on the dynamic behaviour of the SWCNT.
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Dogan Çetin,Mesut Simsek 국제구조공학회 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.40 No.4
In the present study, free vibration of an axially functionally graded (AFG) pile embedded in Winkler-Pasternak elastic foundation is analyzed within the framework of the Euler-Bernoulli beam theory. The material properties of the pile vary continuously in the axial direction according to the power-law form. The frequency equation is obtained by using Lagrange’s equations. The unknown functions denoting the transverse deflections of the AFG pile is expressed in modal form. In this study, the effects of material variations, the parameters of the elastic foundation on the fundamental frequencies are examined. It is believed that the tabulated results will be a reference with which other researchers can compare their results.
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Cetin, Dogan,Simsek, Mesut Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.40 No.4
In the present study, free vibration of an axially functionally graded (AFG) pile embedded in Winkler-Pasternak elastic foundation is analyzed within the framework of the Euler-Bernoulli beam theory. The material properties of the pile vary continuously in the axial direction according to the power-law form. The frequency equation is obtained by using Lagrange's equations. The unknown functions denoting the transverse deflections of the AFG pile is expressed in modal form. In this study, the effects of material variations, the parameters of the elastic foundation on the fundamental frequencies are examined. It is believed that the tabulated results will be a reference with which other researchers can compare their results.
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A novel two-dimensional approach to modelling functionally graded beams resting on a soil medium
Amin Chegenizadeh,Behzad Ghadimi,Hamid Nikraz,Mesut Simsek 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.51 No.5
The functionally graded beam (FGB) is investigated in this study on both dynamic and static loading in case of resting on a soil medium rather than on the usual Winkler-Pasternak elastic foundation. The powerful ABAQUS software was used to model the problem applying finite element method. In the present study, two different soil models are taken into account. In the first model, the soil is assumed to be an elastic plane stress medium. In the second soil model, the Drucker-Prager yield criterion, which is one of the most well-known elastic-perfectly plastic constitutive models, is used for modelling the soil medium. The results are shown to evaluate the effects of the different soil models, stiffness values of the elastic soil medium on the normal and shear stress and free vibration properties. A comparison was made to those from the existing literature. Numerical results show that considering real soil as a continuum space affects the results of the bending and the modal properties significantly.
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A novel two-dimensional approach to modelling functionally graded beams resting on a soil medium
Chegenizadeh, Amin,Ghadimi, Behzad,Nikraz, Hamid,Simsek, Mesut Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.51 No.5
The functionally graded beam (FGB) is investigated in this study on both dynamic and static loading in case of resting on a soil medium rather than on the usual Winkler-Pasternak elastic foundation. The powerful ABAQUS software was used to model the problem applying finite element method. In the present study, two different soil models are taken into account. In the first model, the soil is assumed to be an elastic plane stress medium. In the second soil model, the Drucker-Prager yield criterion, which is one of the most well-known elastic-perfectly plastic constitutive models, is used for modelling the soil medium. The results are shown to evaluate the effects of the different soil models, stiffness values of the elastic soil medium on the normal and shear stress and free vibration properties. A comparison was made to those from the existing literature. Numerical results show that considering real soil as a continuum space affects the results of the bending and the modal properties significantly.
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The prognostic value of tumor budding in gastric adenocarcinomas: A cross-sectional study
Baydas Tuba,Coban Ganime,Besiroglu Mehmet,Simsek Melih,Shbair Abdallah TM,Topcu Atakan,Yasin Ayse Irem,Seker Mesut,Turk Haci Mehmet 소화기인터벤션의학회 2023 International journal of gastrointestinal interven Vol.12 No.2
Background: Tumor budding is a negative prognostic factor for many solid malignancies. We investigated the relationship between patients’ clinico-pathological characteristics and tumor budding, as well as the effect of budding level on prognosis. Methods: In this retrospective, cross-sectional, and descriptive study at a tertiary university hospital, 104 patients with gastric adenocarcinoma were divided into two groups according to whether they had a high (≥ 10 buds) or low (< 10 buds) level of budding. The patients were retrospectively evaluated.Results: Sixty-two patients had a low level of budding and 42 had a high level of budding. The mean time from the first diagnosis to the last follow-up was significantly longer (P < 0.05) in the low-budding group (27 months) than in the high-budding group (17 months). As the T stage, N stage, grade, and size of the tumor increased, the proportion of patients with high budding was found to be significantly higher (P < 0.05). High tumor budding, an age of 60 or over at diagnosis, a low body mass index, high N stage, presence of lymphovascular invasion, and recurrence were associ-ated with overall survival.Conclusion: Our study supports that budding is a negative prognostic factor in gastric cancer.
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