Halis Bilgil

Halis Bilgil
Aksaray Üniversitesi · Mathematics

Professor

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19
Publications
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106
Citations

Publications

Publications (19)
Preprint
CO 2 emissions in the world have also become one of the most important research topics. In order for policymakers to achieve the goal of reducing carbon emissions and to create environmental policies, it is important to predict how CO 2 emissions will progress. The grey modelling in the prediction of time series has been one of the interesting stud...
Article
The new priority in the grey modelling is to build new models that have more accurate forecasting power than the previous ones. This paper aims to develop the prediction performance of the existing continuous grey models. Therefore, a novel continuous grey model (OCCFGM (1,1)) is proposed with conformable fractional derivative. The numerical result...
Article
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Grey theory is an approach that can be used to construct a model with limited samples to provide better forecasting advantage for short-term problems. In some cases, a grey forecasting model may yield unacceptable forecasting errors. In this work, a new exponential grey prediction model, which is called as EXGM (1,1), is proposed. By using this mod...
Article
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Present endeavor is devoted to estimate the air-conditioning and heating energies or loads of modern buildings in Duhok City, Iraq using new mathematical models. Many parameters have been considered in current modeling, namely, area of building, number of storeys and types of the common materials of the building walls. Regression analysis is perfor...
Article
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This paper presents the two-dimensional (2D) steady incompressible flow in a lid-driven sectorial cavity. In order to analyze the flow structures, the 2D Navier–Stokes equations are solved by using the finite element method. Different cases of the cavity aspect ratio A and three cases of the speed ratios (Formula presented.) of the upper and the lo...
Article
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Konuralp Journal of Mathematics (KJM) is a fully-refereed electronic journal. (KJM) is devoted to the high quality publication of current research developments in the all fields of Mathematics and applications in all interdisciplinary areas. The journal is published twice a year.
Article
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In this article, the fractional derivatives in the sense of modified Riemann–Liouville and the exp-function method are used to construct exact solutions for some nonlinear partial fractional differential equations via the nonlinear fractional Liouville equation and nonlinear fractional Zoomeron equation. These nonlinear fractional equations can be...
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This work analyzes the Stokes flow generated in a sectorial driven cavity formed by a pair of curved stationary side walls capped by straight translating lids. The flow is governed by two physical control parameters: the cavity aspect ratio, (where and are the radii of the inner and outer curved side walls, respectively) and the ratio () of the up...
Article
In this study, the mechanism of segregation during the filling of fresh concrete into formwork is numerically investigated. A mathematical model, which considers fresh concrete as a non-Newtonian fluid, is developed. The aggregates are considered as Lagrangian particles whose trajectories determine segregation. Aggregate segregation is partially af...
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We consider the Naguma equation, Newel-Whitehead (or KPP) equation and Huxley equation. Besides, a homogeneous balance method is improved and new exact solutions of Naguma, Newel-Whitehead, Huxley equations are found.
Article
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We consider nonlinear evolution equations such as Calogero equation and Hirota-Satsuma (HS) equation. Painlevé analysis of WTC method is performed for these equations and shown that these equations have Painlevé property. Hence Calogero and HS equations are to expected to be integrable. Besides, a homogeneous balance method is improved and new exac...

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