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Photoelectrochemical etching of GaN in different solutions such as KOH, HF/H2O2/C2H5OH and oxalic acid was performed. The results of scanning electron microscopy cathodoluminescence analysis of the etched samples are presented.

The purpose of this paper is to introduce a new type of φ -implicit relation in S - metric spaces and to prove a general fixed point for a pair of weakly compatible mappings, which generalize Theorems 1, 2, 4 [23], Theorems 1-7 [13], Corollary 2.19 [13], Theorems 2.2, 2.4 [19], Theorems 3.2, 3.3, 3.4 [20] and other known results.

By using m-open multifunctions from an m-space into an m-space, we establish the unified theory for several weak forms of open multifunctions between topological spaces. [ABSTRACT FROM AUTHOR]

The purpose of this paper is to extend Theorem 5 [18] to a S - metric space, without orbitally continuity, generalizing Theorem 4 [2], Theorems 1-4, 6-8 [11], Corollary 2.19 and 2.21 [23], Theorems 23, 24 [20], Theorems 3.2-3.4 [21] and to obtaining a Ćirić-Jotić-type result in S - metric spaces. [ABSTRACT FROM AUTHOR]

Let mIO(X) be the family of *-open (resp. α-I-open, pre-I-open, semi-I-open, β-Iopen, etc.) sets in an ideal topological space (X, τ, I). By using mIO(X), we introduce and investigate the notions of an m-I-continuous multifunction F : (X, τ, I) → (Y, σ) and mi*-continuous multifunction F : (X, τ, I) → (Y, σ, J) . The notion of mi*-continuity is a generalization of m-I-continuity and i*-continuity [9]. [ABSTRACT FROM AUTHOR]

We introduce the notions of upper/lower (τ,m)-Jcontinuous multifunctions and obtain many characterizations of such multifunctions. The notion is obtained from a multifunction F: (X, τ) → (Y, σ, J) and several generalizations of J-open sets on the ideal topological space (Y, σ, J). If F is single valued, m = σ and J = {∅}, then the above multifunction is a (τ,m)-continuous function. [ABSTRACT FROM AUTHOR]

We introduce and study a unified form (called m*-Icontinuity) of *-continuity [9], α(*)-continuity [10], β(*)-continuity [11] and other continuity for multifunctions in ideal topological spaces. [ABSTRACT FROM AUTHOR]

In this paper a new type of common coincidence range property in partial metric space is introduced and a general fixed point theorem is proved. As applications, new results for the mappings satisfying a contractive condition of integral type and for the mappings satisfying a φ -- contractive condition are obtained. [ABSTRACT FROM AUTHOR]

We introduce the notion of mIO(X)-structures determined by operators Int, Cl and Cl* on an ideal topological space (X, τ, I). By using mIO(X)-structures, we obtain a unified form of some separation axioms containing semi-I-Ti, β-I-Ti, b-I-Ti(i = 0, 1, 2) and other. [ABSTRACT FROM AUTHOR]

We introduce the notion of umIO(X)-structures determined by operators mInt, mCl, mInt and mCl on an ideal minimal space (X,mX, I). By using umIO(X)-structures, we introduce and investigate a function f: (X,mX, I) ?(Y,s) called umI-continuous. As special cases of umI-continuity, we obtain m-semi-I -continuity [11], m-pre-I -continuity [10], m-α-I -continuity [2], m-b-I-continuity [15], and m-β-I -continuity [9]. [ABSTRACT FROM AUTHOR]

We introduce the notion of upper/lower contra m-I-continuous multifunctions and we investigate their properties. As a special case of upper/lower contra m-I-continuous multifunctions, we obtain upper/lower contra-pre-I-continuous multifunctions introduced in [43]. [ABSTRACT FROM AUTHOR]

In this paper a general fixed point theorem for two pairs of pointwise absorbing mappings in dislocated metric space is proved. As applications we obtain new results for mappings satisfying contractive conditions of integral type and for '-contractive mappings. [ABSTRACT FROM AUTHOR]

In this paper we extend Theorem 3.2 [32] to G - metric space. As applications, we obtain new results for mappings satisfying contractive conditions of integral type and for mappings satisfying' - contractive conditions. [ABSTRACT FROM AUTHOR]

We introduce the notion of mIO(X)-structures determined by the operators Int, Cl and Cl* on an ideal topological space (X, τ, I). By using mIO(X)-structures, we introduce and investigate a class of functions f: (X, τ, I) → (Y, mY) called MI-continuous. As special cases of MI-continuity, we obtain semi-I-continuity [9], pre-I-continuity [6], α-I-continuity [9], semi-I-irresoluteness [11], α-pre-irresoluteness [24]. [ABSTRACT FROM AUTHOR]