Azerbaijan University

Baku, Azerbaijan

Azerbaijan University

Baku, Azerbaijan
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Nasibzade V.N.,Azerbaijan University
Journal of Automation and Information Sciences | Year: 2017

The problem of edge function determination for equation of oscillations of rectangular membrane is considered. Determination of unknown edge function is reduced to the problem of minimum of the functional, constructed by means of additional information, gradient of the functional, necessary and sufficient conditions of optimality are obtained. Algorithm of determination of optimal control by the gradient projection method is stated.

Abdullayev V.M.,Azerbaijan University
Cybernetics and Systems Analysis | Year: 2017

We investigate the solution to the parametric identification problem for loaded systems of differential equations. We propose to use iterative methods based on the first-order optimization methods. For this purpose, we obtain formulas for the gradient of the objective functional, which assesses the adequacy degree of the obtained parameters. The results of numerical solution to some test problems are given. © 2017 Springer Science+Business Media New York

Aliev R.A.,Joint MBA Program | Alizadeh A.V.,Azerbaijan University | Huseynov O.H.,Azerbaijan State Oil Academy
Information Sciences | Year: 2015

Real-world information is imperfect and is usually described in natural language (NL). Moreover, this information is often partially reliable and a degree of reliability is also expressed in NL. In view of this, L.A. Zadeh suggested the concept of a Z-number as a more adequate concept for description of real-world information. A Z-number is an ordered pair Z = (A; B) of fuzzy numbers A and B used to describe a value of a random variable X, where A is an imprecise estimation of a value of X and B is an imprecise estimation of reliability of A. The main critical problem that naturally arises in processing Z-numbers-based information is computation with Z-numbers. The general ideas underlying computation with continuous Z-numbers (Z-numbers with continuous components) is suggested by the author of the Z-number concept. However, as he mentions, "Problems involving computation with Z-numbers is easy to state but far from easy to solve". Nowadays there is no arithmetic of Z-numbers suggested in the existing literature. Taking into account the fact that real problems are characterized by linguistic information which is, as a rule, described by a discrete set of meaningful linguistic terms, in our study we consider discrete Z-numbers. We suggest theoretical aspects of such arithmetic operations over discrete Z-numbers as addition, subtraction, multiplication, division, square root of a Z-number and other operations. The validity of the suggested approach is demonstrated by a series of numerical examples. © 2014 Elsevier Inc. All rights reserved.

Shoja-Majidabad S.,Azerbaijan University
Journal of Control, Automation and Electrical Systems | Year: 2016

This paper deals with the control of fractional-order nonlinear systems subjected to matched and unmatched perturbations. A novel control strategy is proposed based on nonlinear block control and sliding mode technique. Based on the block control technique, robust virtual control laws are developed step by step to suppress the mismatched perturbation vector of each block. Afterward, a sliding mode controller is designed to deal with the matched uncertainty vector and stabilize the fractional-order nonlinear system. The tracking errors convergence to zero are proved using fractional-order version of stability theorems. The proposed control strategy is simple and avoids high derivational computations. Eventually, simulation results show that the designed controller attains a satisfied control performance and is robust against matched and unmatched perturbations. © 2016, Brazilian Society for Automatics--SBA.

Iranifam M.,Azerbaijan University | Zarei M.,University of Tabriz | Khataee A.R.,University of Tabriz
Journal of Electroanalytical Chemistry | Year: 2011

The advanced oxidation processes (AOPs), which can produce oxidizing hydroxyl radicals (OH) have been proven to be an efficient method for degradation of the dyes. In this work, the decolorization of a dye solution containing C.I. Basic Yellow 28 (BY28) was performed by photoelectro-Fenton (PEF) combined with photocatalytic process. Carbon nanotube- polytetrafluoroethylene (CNT-PTFE) electrode was used as cathode. The investigated photocatalyst was ZnO nanoparticles having specific surface area (BET) 32.23 m2/g, and mean crystal size 15 nm immobilized on glass plates. A comparison of ultraviolet-C (UV-C), Electro-Fenton (EF), UV/ZnO, PEF and PEF/ZnO processes for decolorization of BY28 solution was performed. Results revealed that color removal efficiency follows the decreasing order: PEF/ZnO > PEF > UV/ZnO > EF > UV-C. The influence of the basic operational parameters including initial dye concentration, applied current, initial pH of the solution, initial Fe3+ concentration and kind of UV light on the decolorization efficiency of BY28 was studied. The mineralization of the dye was investigated by total organic carbon (TOC) measurements that showed 94.7% mineralization of 20 mg/l dye at 6 h using PEF/ZnO process. Furthermore, identity of the produced intermediates in the course of mineralization was assessed exploiting gas chromatography-mass spectrometry (GC-MS) analysis. © 2011 Elsevier B.V. All rights reserved.

Mukhtarov F.,Azerbaijan University | Fox S.,Free University of Berlin | Mukhamedova N.,International Water Management Institute Central Asia | Wegerich K.,International Water Management Institute Central Asia
Environmental Science and Policy | Year: 2015

Institutional design for water governance assumes the possibility of intentional introduction of policy innovations into the new contexts or amending existing institutions. Such institutional design has been common in the water sector and examples include participatory irrigation management, integrated water resources management plans and water privatization programmes. With increasing application of institutional design across various political, socio-economic and cultural settings, the importance of the context is increasingly accepted. The key question is therefore how to reconcile institutional design and contextual variability. Based on our research on the introduction of water user associations in parts of Turkey, Azerbaijan and Uzbekistan, we conclude that a top-down institutional design implemented nation-wide and not involving multiple stakeholders and engaging their views, is doomed to failure. As an alternative, we offer interactive institutional design, which is based on collaborative approaches to institutional design and treats design as works of assemblage. © 2014 Elsevier Ltd.

Aliyev N.A.,Central Mental Clinic for Outpatients of Baku City | Aliyev Z.N.,Azerbaijan University
Journal of Clinical Psychopharmacology | Year: 2011

Objective: Depersonalization disorders (DPDs) are highly prevalent in population. However, the effect of lamotrigine on outpatients with DPD without psychiatric comorbidity has not been studied in a double-blind placebo-controlled design. Method: Eighty patients (all men) were washed out from all medications. Each patient was randomized either to receive lamotrigine (40 patients) for 12 weeks or matched on placebo (40 patients) in a double-blind manner. Eligible participants, in addition to meeting the criteria for DPD from Diagnostic and Statistical Manual of Mental Disorders, 4th Edition, Text Revision, were required to be between 18 and 65 years. Response was defined as a 50% reduction in the Cambridge Depersonalization Scale. Response effects with lamotrigine and placebo were compared by using analysis of variance and χ tests. Six patients did not return for at least 1 subsequent assessment, and 74 patients dropped out (36 taking lamotrigine and 38 taking placebo) in the valuables study group. Results: Of the 36 lamotrigine-treated participants, 26 responded by 12 weeks versus 6 of the 38 placebo-treated participants (P < 0.001). The most common and problematic adverse effect in the lamotrigine group was rash. Conclusions: The authors believe this to be the first double-blind placebo-controlled randomization study to test the efficacy of lamotrigine in the management of outpatients with DPDs. These need to be replicated in a larger study group. Copyright © 2011 by Lippincott Williams & Wilkins.

Iranifam M.,Azerbaijan University
TrAC - Trends in Analytical Chemistry | Year: 2013

Analytical applications of chemiluminescence detection systems based on magnetic microparticles and nanoparticles (MMP-CL and MNP-CL) have attracted growing interest in research and commercial fields. This article reviews the literature on the analytical applications of MMP-CL and MNP-CL systems, illustrated by different reaction strategies, such as immunoassay and hybridization labels in diverse fields (e.g., clinical and pharmaceutical, environmental or food analysis). © 2013 Elsevier Ltd.

Ismkhan H.,Azerbaijan University
New Generation Computing | Year: 2016

The rate of mutation has deep effects on the performance of genetic algorithm (GA). Current mechanisms to control mutation rate (MR) utilize the mathematical functions which usually are monotonic. These mechanisms are too rigid and inflexible. These methods change the MR without enough attending the position of GA. For instance these methods don’t attend whether GA is in trap or not. This research proposes a novel mechanism which controls MR by an algorithm which uses a concept of defined local trap. This algorithm probes whether GA is in the local trap or is not. In case of local trap, it changes the MR. This methodology is named MRCA (Mutation Rate Control Algorithm). To evaluate performance of MRCA, it is applied to multimodal continuous optimization functions and also a type of combinatorial optimization problem. The results show that MRCA outperforms other state-of-the-art strategy in term of accuracy and speed. © 2016, Ohmsha and Springer Japan.

Ismkhan H.,Azerbaijan University
Swarm and Evolutionary Computation | Year: 2016

Although ant colony optimization (ACO) has successfully been applied to a wide range of optimization problems, its high time- and space-complexity prevent it to be applied to the large-scale instances. Furthermore, local search, used in ACO to increase its performance, is applied without using heuristic information stored in pheromone values. To overcome these problems, this paper proposes new strategies including effective representation and heuristics, which speed up ACO and enable it to be applied to large-scale instances. Results show that in performed experiments, proposed ACO has better performance than other versions in terms of accuracy and speed. © 2016 Elsevier B.V.

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