A modelling of geothermal resource's efficiency via data envelopment analysis

Subject	Modelling social and economic systems
Title	A modelling of geothermal resource's efficiency via data envelopment analysis
Author(s)	Elif OZTURK, Esra DEMIREL
Keywords	Data Envelopment analysis (DEA), efficiency, geothermal resource.
Abstract	This research utilizes relational data envelopment analysis (DEA) to construct a model to analyze the efficiency of effectiveness of geothermal resources of Biga Penisula (Canakkale) in western Turkey. One input and two outputs are used in analysis, covering 9 geothermal resources. The results show that one geothermal resource is efficient.

A note on the numerical solution of the semilinear elliptic equation

Subject	Local and nonlocal boundary value problems for partial differential equations
Title	A note on the numerical solution of the semilinear elliptic equation
Author(s)	Elif Ozturk, Esra Demirel
Keywords	semilinear elliptic equation, difference scheme, Bitsadze- Samarskii type problem
Abstract	The study of boundary value problems for elliptic eqautions were considered in [1-6]. A. V Bitsadze and A. A. Samarskii had proved existence and uniqueness of a classical solution to an elliptic second-order equation in a rectangle with nonlocal boundary conditions [7]. Previously, the Bitsadze-Samarskii type nonlocal boundary value problems for semilinear elliptic equations were studied [3]. The unique solvability of Bitsadze-Samarskii type nonlocal boundary value problems for the semilinear elliptic equations in a Hilbert space was investigated in that work. In this paper, we consider the same problem for approximately solving of this problem in a Hilbert Space [3] . The difference scheme is used to overcome the difficulties in numerical procedure.