Results 31 to 40 of about 6,337 (213)

Analysis of concrete shallow funicular shells of rectangular plan

Curved and Layered Structures, 2019
Analysis of concrete shallow funicular shells of rectangular plan with simply supported boundary conditions under static loads is performed using the Ritz method.
Sabermahany Hadi, Rasouli Erfan, Mofid Massood   +2 more
doaj   +1 more source

Numerical Solution of Fractional Diffusion Wave Equation and Fractional Klein–Gordon Equation via Two-Dimensional Genocchi Polynomials with a Ritz–Galerkin Method

Computation, 2018
In this paper, two-dimensional Genocchi polynomials and the Ritz–Galerkin method were developed to investigate the Fractional Diffusion Wave Equation (FDWE) and the Fractional Klein–Gordon Equation (FKGE).
Afshan Kanwal, Chang Phang, Umer Iqbal
doaj   +1 more source

Legendre Ritz-Least squares method for the numerical solution of delay differential equations of the multi-pantograph type [PDF]

Mathematics and Computational Sciences
This paper is concerned with a Legendre Ritz-Least squares technique for the non-singular and singular delay differential equations (DDEs) of multi-pantograph type. This tech-nique is based on Legendre polynomials and Least squares.
Meisam Noei Khorshidi, Mohammad Arab Firoozjaee   +1 more
doaj   +1 more source

Free and Forced Vibration Characteristics Analysis of a Multispan Timoshenko Beam Based on the Ritz Method

Shock and Vibration, 2021
The uniform formulation of dynamic vibration analysis of multispan beams is presented by using an efficient domain decomposition method in this paper.
Cong Gao, Fuzhen Pang, Haichao Li, Hongfu Wang, Jie Cui, Jisi Huang   +5 more
doaj   +1 more source

Ritz formulation for the wave propagation analysis of axially functionally graded carbon nanotubes [PDF]

Proceedings of the Estonian Academy of Sciences
Longitudinal wave propagation in axially functionally graded carbon nanotubes was investigated using three different solution methods: analytical, higher order Haar wavelet and Ritz methods.
Mustafa Arda, Tamer Tosun
doaj   +1 more source

A Numerical Solution of Fractional Optimal Control Problems Using Spectral Method and Hybrid Functions [PDF]

Control and Optimization in Applied Mathematics, 2018
In this paper, a modern method is presented to solve a class of fractional optimal control problems (FOCPs) indirectly. First, the necessary optimality conditions for the FOCP are obtained in the form of two fractional differential equations (FDEs). Then,
Seyed Mehdy Shafiof, Javad Askari, Maryam Shams Solary   +2 more
doaj   +1 more source

Innovative Application of the Ritz Method to Oil-Gas Seepage Problems: A Novel Variational Approach for Solving Underground Flow Equations

Energies
State-of-the-art commercial simulators (e.g., Eclipse, CMG) predominantly employ finite difference schemes, which face persistent challenges in modeling strongly nonlinear seepage dynamics. This study explores the application of the Ritz method, grounded
Xiongzhi Liu, Hao Yang, Lifei Dong, Ming Lei, Jie Han, Hao Kang   +5 more
doaj   +1 more source

Effect of lamination schemes on natural frequency and modal damping of fiber reinforced laminated beam using Ritz method

International Journal for Simulation and Multidisciplinary Design Optimization, 2021
The current study focussed on analysing natural frequency and damping of laminated composite beams (LCBs) by varying fiber angle, aspect ratio, material property and boundary conditions.
Naidu Balireddy Somi, Jeyaraj Pitchaimani, Chinnapandi Lenin Babu Mailan, Reddi Ch V.S.N.   +3 more
doaj   +1 more source

Paying for Privilege: How Political Contributions Undermine Environmental Sustainability—And How Executive Contracting Can Restore Balance

Business Strategy and the Environment, EarlyView.
ABSTRACT We are interested in investigating whether firms use political donations as a license to neglect environmental sustainability. We further deepen the examination by exploring the role of executive contracting. Drawing on a wide range of data between 2002 and 2021 and a global sample, our findings confirm that firms use political contributions ...
Habiba Al‐Shaer, Ali Uyar, Cemil Kuzey, Abdullah S. Karaman   +3 more
wiley   +1 more source

Maternal Thyroid Diseases, Medication Use and Childhood Cancer Risks in Offspring: A Population‐Based Cohort Study in Denmark

International Journal of Cancer, EarlyView.
Thyroid diseases are common among women of reproductive age and may be related to childhood cancer, but the evidence is inconsistent. This study of childhood cancer with maternal thyroid diseases and medication use in a population‐based case‐control study using Danish registries found positive associations between maternal goiter and overall cancer ...
Chuanjie Deng, Kosuke Inoue, Chai Saechao, Johnni Hansen, Beate Ritz, Julia E. Heck   +5 more
wiley   +1 more source