Browsing by Author "Sahmurova, Aida"

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Citation Count: 2
Abstract elliptic operators appearing in atmospheric dispersion
(Springeropen, 2014) Shakhmurov, Veli B.; Sahmurova, Aida
In this paper, the boundary value problem for the differential-operator equation with principal variable coefficients is studied. Several conditions for the separability and regularity in abstract L-p-spaces are given. Moreover, sharp uniform estimates for the resolvent of the corresponding elliptic differential operator are shown. It is implies that this operator is positive and also is a generator of an analytic semigroup. Then the existence and uniqueness of maximal regular solution to nonlinear abstract parabolic problem is derived. In an application, maximal regularity properties of the abstract parabolic equation with variable coefficients and systems of parabolic equations are derived in mixed L-p-spaces.
Citation Count: 0
Abstract elliptic operators appearing in atmospheric dispersion (vol 2014, pg 43, 2014)
(Springer international Publishing Ag, 2014) Shakhmurov, Veli B.; Sahmurova, Aida
[No Abstract Available]
Citation Count: 11
Abstract parabolic problems with parameter and application
(Elsevier Science inc, 2013) Shakhmurov, Veli B.; Sahmurova, Aida
In this work, the uniform well-posedenes of singular perturbation problems for parameter dependent parabolic differential-opera tor equations is established. These problems occur in phytoremediation modelling. (C) 2013 Elsevier Inc. All rights reserved.
Citation Count: 0
Antifungal Activity of the Essential Oils of Pyrethrum leptophyllum Stev. ex Bieb.
(destech Publications, inc, 2010) Sahmurova, Aida; Duncan, Brent Phillip; Bahshaliyeva, Konul; Mehdiyeva, Naiba; Mustafayeva, Sitare
Chemical composition of essential oil extracted from Pyrethrum leptophyllum Stev. ex Bieb., a plant of Caucasian endemic flora, was examined. Essential oil was extracted using a hydrodistillation method and above-ground portions of the plant (0.1%) during its blooming season. According to chromatospectrometer results, major compounds of essential oil are alpha-Thujone (85.004%) and beta-Thujone (10.566%). It has been determined that water extract and essential oil from Pyrethrum leptophyllum is responsible for antifungal activity against Trichoderma lignorum, Fusarium oxysporum, and Aspergillus niger.
Citation Count: 4
Assessment of heavy metal contamination in urban soil (Tuzla District, Istanbul, Turkey)
(desalination Publ, 2019) Sezgin, Naim; Balkaya, Nilgun; Sahmurova, Aida; Aysal, Namik
In this study, the heavy metal contamination in the soils of the selected upstate area of Tuzla District, which is located in the Anatolian side of Istanbul, Turkey, was investigated. The current status of the soil was evaluated using geo-accumulation index (I-geo), enrichment factor (EF), potential ecological risk (E-r), risk index (RI), and pollution load index (PLI). The average values of I-geo for Cu, Pb, Zn, Cd, and Hg were found as 0.310, -0.013, 0.424, -0.115, and 0.087, respectively. According to the Igeo classifications, the soil qualities of the study area were determined to be uncontaminated, and uncontaminated to moderately contaminated. The average EF values of these metals were determined to be between 2 to 5, which means that the soil was in moderate enrichment categories. The E-r risk of the soil at the sampling points were defined generally as low ecological risk categories except for the SL1 and SL2 sampling points. SL1 and SL2 were detected to have moderate ecological risk. In addition, the average PLI was found as 1.76, and according to this PLI value, the contamination of study area soil was identified as moderately polluted to unpolluted. Consequently, the results of the study indicated that some locations in the study area were affected by anthropogenic activities.
Citation Count: 14
Biosorption Kinetics and Isotherm Studies of Cd(II) by Dried Enteromorpha compressa Macroalgae Cells from Aqueous Solutions
(Wiley, 2010) Sahmurova, Aida; Turkmenler, Harun; Ozbas, Emine Elmaslar
For the first time ever Enteromorpha compressa macroalgae (ECM) which is commonly found in Turkey has been used as biosorbent by us This study aims to investigate the biosorption of Cd2+ from aqueous solutions in a batch system by using an alga of ECM in different concentrations pH levels agitation rates (90-150 rpm) and contact periods The maximum biosorption capacity of the ECM was found to be 9 50 mg/g at pH 6 Cd2+ initial concentration of 10 mg/L and agitation rate 150 rpm Cadmium removal efficiency was about 95% The experimental isotherm data were analyzed using the Langmuir and Freundlich equations Isotherm parameters for both equations were determined and discussed The stated biosorption mechanism is explained by the Freundlich isotherm (r(2) = 0 998) theory Two simplified kinetic models including a pseudo-first and second order equation were selected to follow the biosorption process Kinetic parameters rate constants equilibrium adsorption capacities and related correlation coefficients for each kinetic model were calculated and discussed It was shown that the biosorption of cadmium onto ECM could be described by the pseudo-second order equation (r(2) > 0 99)
Citation Count: 2
Biosorption of Cd²⁺ and Zn²⁺ ions in leachate with Enteromorpha compressa macroalga
(Natl inst Science Communication, 2008) Sahmurova, Aida; Kose, Sati; Ozbas, Emine Elmaslar
This study presents biosorption of Cd2+ and Zn2+ ions from landfill leachate by using an alga of Enteromorrpha compressa type. Retention time of 60 min and pH 4 have been found optimum for biosorption of both metals.
Citation Count: 0
Classification of Regions with Endemic Diseases Based on Trace Element Concentrations in Groundwater
(Hard, 2016) Sahmurova, Aida; Shahmurzada, Bunyad
This study measured trace elements and assessed fluoride levels in groundwater in Azerbaijan. We investigated endemic diseases in regions of Azerbaijan using the aforementioned data. Geographic regions were classified as an endemic region or not by using a support vector machine (SVM). Classification accuracy for the SVM classifier was determined to be 76.92%.
Citation Count: 0
Degenerate Anisotropic Parabolic Problems Occurring in Atmospheric Dispersion of Pollutants
(Amer inst Physics, 2011) Shakhmurov, Veli B.; Sahmurova, Aida
In the present paper the boundary value problems for degenerate anisotropic differential operator equations with variable coefficients are studied. Several conditions for the separability and Fredholmness in Banach-valued L-p-spaces are given. Sharp estimates for resolvent, of the corresponding differential operators are obtained. By using these results the existence, uniqueness and the maximal regularity of boundary value problems for parabolic differential-operator equations are established. In applications mixed boundary value problems for diffusion systems, appearing in the atmospheric dispersion of pollutants are studied.
Citation Count: 0
Degenerate parabolic equations appearing in atmospheric dispersion of pollutants
(Univ Szeged, Bolyai institute, 2016) Shakhmurov, Veli; Sahmurova, Aida
Linear and nonlinear degenerate abstract parabolic equations with variable coefficients are studied. Here the equation and boundary conditions are degenerated on all boundary and contain some parameters. The linear problem is considered on the moving domain. The separability properties of elliptic and parabolic problems in mixed L-p spaces are obtained. Moreover, the existence and uniqueness of optimal regular solution of mixed problem for nonlinear parabolic equation is established. Note that, these problems arise in fluid mechanics and environmental engineering.
Citation Count: 1
Determination of micro-elements in surface water resources
(destech Publications, inc, 2007) Sahmurova, Aida; Ongen, Atakan; Ozbas, Emine Elmaslar; Balkaya, Nilgun
The basic resources of microelements that are essential for human life. However, in larger or lower amounts, they may become important and critical. They may accumulate in biological systems and become a significant health hazard. Biochemical and physical adaptation of microorganisms is related to geophysical properties and the environmental factors in the surrounding habitat. Therefore many research studies have been conducted dealing microelements and their effect on ecosystems. In this study, heavy metal contamination in the samples taken from surface water resources in the Republic of Azerbaijan were examined. During the study, concentrations of 7 microelements (I, F, Cu, Co, Mn, Zn, Mo) in surface waters were determined. As microelement concentration of the water in the water springs varied from region to region due to the ion structure of the water, microelement concentrations are shown as minimums and maximums and the correlation between above-mentioned microelements was determined. This correlation was taken into account as an additional factor for occurrence of endemic illnesses.
Citation Count: 2
Determination of the accumulator plants in Kucukcekmece Lake (Istanbul)
(Academic Journals, 2010) Sahmurova, Aida; Celik, Mucella; Allahverdiyev, Surhay
Soils are polluted by actions like using commercial fertilizers, pesticides, soil regulators and hormones to increase the amount and quality of agricultural production, discharge of soil and liquid wastes, performing wastewater sludge applications, using polluted waters in agricultural irrigation, atmospheric precipitations and radioactive sprays. It is an important environmental problem to reform and clean the soils polluted with heavy metals. Phytoremediation is a measure which uses several plants to remove the pollutants from water and soil to reduce, completely extract, control or immobilize them. The plants used for this reason are referred to as the accumulators. Metal accumulation can occur in several different families like small annual grass to perennial bushes and trees. For remediation or cleaning of the soils polluted with heavy metals, the ideal plant species are the ones which can produce high amounts of biomass, and can accumulate and tolerate the pollutants. In this study, the Cd and Zn contents obtained from Kucukcekmece Lake border were monitored on monthly basis and it was aimed at determining the plant species with accumulation ability. The plants chosen for this activity were Labiatae galatica, Compositae cardueae, Cypereace carex, and Phragmites australis. Compositae cardueae was the most efficient species in terms of mean heavy metal intake performance.
Citation Count: 0
EFFECTS OF NOISE POLLUTION ON ANGER AND SMOKING ADDICTION IN COLLEGE STUDENTS
(inst integrative Omics & Applied Biotechnology, 2020) Sahmurova, Aida; Gursesli, Mustafa Can
A common phenomenon observed in our daily lives, noise leads to both auditory and non-auditory health problems. In addition to workplace environments where people often develop noise-induced hearing loss, noise may frequently lead to hearing loss in our everyday lives, too. Also, it is proven that too much exposure to noise combined with other variables has a triggering effect. Furthermore, there is a meaningful relationship between smoking and anger, and increase in anger symptoms is observed in smokers during their deprivation periods. In this research, in order to measure the anger variable, The State-Trait Anger and Anger Expression Scale and in order to measure smoking Fagerstrom Test for Nicotine Dependence Scale were used. In order to measure the noise intensity, CESVA DC 311 model T240385 serial numbered devices were used in 8 different spots. The research took place and was evaluated in Okan University and 473 individuals participated the research. Considering this research, the correlation between noise levels and anger and smoking addiction was tested while studying the relationship of these variables on college students' group. According to the results of the study, noise was found to be significantly and positively correlated with the trait, state, outraged and hated anger. However, there is significant positive correlation between trait anger and nicotine addiction in the smoking group. Mean scores for the trait, state, outraged, and hated anger were found higher among smoking addicts when compared to non-smokers. On the other hand, the mean scores for controlled anger were higher among non-smokers.
Citation Count: 1
EFFECTS OF NOISE POLLUTION ON ATTENTION DEFICIT AND HYPERACTIVITY DISORDER IN COLLEGE STUDENTS
(inst integrative Omics & Applied Biotechnology, 2020) Sahmurova, Aida; Gursesli, Mustafa Can
Attention Deficit Hyperactivity Disorder (ADHD) springs in childhood and is described with behaviors like impulsivity, inattention, struggling with paying attention and hyperactivity. Causes can be various such as inheritance, neurological/neuropsychological or environmental. People get affected not only psychologically, but also physiologically. Noisy environments usually affect people with ADHD as well. The inattention symptoms of ADHD become clearer as the noise gets louder. The relation between ADHD and noise is aimed to be studied in this research. 622 individuals participated in the research in Istanbul Okan University. CESVA DC 311 model device was used in 8 different places in order to measure noise levels in the first part of the survey. Next, in order to study the relation between ADHD and noise, Adult Self-Report scale was used on students. The analysis indicated that average of impulsivity and hyperactivity of participants in Humanities and Social Sciences Faculty is much lower than those in Wellness Center. A significant difference in ADHD total point average was found. By Tukey test, the origin of difference was analyzed, and it was observed that total average points of participants in Humanities and Social Sciences Faculty was significantly lower than those in Wellness Center. According to unpaired T-test data in demographic parameter studies, no significant difference between these parameters and ADHD points was found.
Citation Count: 1
Evaluation of Trace Element Concentrations in Groundwater and Classification of Endemic Disease Regions using Multilayer Perceptron Neural Network
(destech Publications, inc, 2009) Sahmurova, Aida; Kilic, Niyazi; Okan, Isil; Karaca, Ferhat; Ucan, Osman N.
In this study, trace elements were measured in the groundwater in Azerbaijan and the level of the fluoride was assessed. The endemic diseases in the regions of Azerbaijan were investigated by using these data. A Multilayer Perceptron Neural Network (MLPNN) was used to classify the regions with or without an endemic disease. MLPNN employing a backprobagation training algorithm was used to predict the presence or the absence of endemic disease potential in the regions. At the end of the classification process, percentages of the towns with or without an endemic disease were calculated as 100% and 68.75% respectively. Total classification accuracy of MLPNN was determined as 75%. Therefore, we can conclude that a MLPNN is one of the most promising methods for classification of regions with endemic diseases, based on the trace elements in the groundwater.
Citation Count: 1
The financial feasibility of the phytoremediation technology: Assessment of remediation by Sideritis galatica, poplar and willow
(destech Publications, inc, 2008) Sahmurova, Aida; Teker, Dilek
Phytoremediation is a process which uses several plants to remove the pollutants from water and soil to reduce, completely extract, control or immobilize them. The plants used for this reason are referred to as the hyperaccumulators. Metal accumulation can occur in several different families from small annual grass to perennial bushes and trees. For remediation or cleaning of the soils polluted with heavy metals, the ideal plant species are the ones which can produce high amounts of biomass and can accumulate and tolerate the pollutants. In this research, Cd and Zn metals which occurred because of industrial wastes are observed in the roots of Phragmites Australis, Cyperace carex, Sideritis galatica and Compositae cardueae plants in Kucukcekmece region. Among these, Sideritis galatica was found to be the most beneficial plant for remediation. Furthermore, it was observed that the Kucukcekmece region is also suitable for growth of willow and poplar trees. This study includes a financial feasibility analysis that determines the monetary benefit of phytoremediation as well as the environmental advantages. The financial outputs are compared by the net present value model and internal rate of return approaches.
Citation Count: 2
HEAVY METAL REMOVAL BY USING DRIED ENTEROMORPHA COMPRESSA MACRO ALGAE FROM AQUEOUS SOLUTION AND INDUSTRIAL WASTEWATER APPLICATION
(Parlar Scientific Publications (p S P), 2013) Sahmurova, Aida; Turkmenler, Harun; Gulnaz, Osman
In this study adsorption of Zn (II) ions from aqueous solution was studied using Enteromorpha Compressa (EC) as an adsorbent. The FT-IR analysis results shows that EC biomass have several metal binding functional groups such as carboxyl and hydroxyl groups. The zero point of charge of the biomass was determined as pH 5.56 +/- 0.2. The optimum adsorption pH was determined at pH 6 and maximum adsorption capacity (Q(max)) of EC was determined as 625 mgg(-1). Adsorption capacity of biomass was increased with increase of the initial metal concentrations, however increasing the particle size range of biomass decreased the Zn (II) adsorption capacity. The pseudo second-order model well described the adsorption of Zn (II) on EC. The general using and efficiency of EC to treatment of industrial wastewater was tested. EC biomass effectively removed metal ions from industrial wastewater. contain 0.186 mgL(-1) of Cd, 0.034 mgL(-1) of Cu, 0.16 mgL(-1) of Zn ions. The the Chemical Oxygen Demand (COD) of industrial wastewater reduced after adsorption experiment from 886 to 729 mgL(-1) for sample 1 at pH 6.
Citation Count: 2
Enteromorpha compressa macroalgae as biosorbent for heavy metal removal: a preliminary economical evaluation
(desalination Publ, 2016) Sahmurova, Aida; Balkaya, Nilgun
In this study, the feasibility of using Enteromorpha compressa macroalgae for developing a biosorbent for the use in metal removal from industrial wastewater was discussed in the light of economic models. The net present value and the internal rate of return were used to evaluate the economics of the process. It was concluded that supply to the market as a biosorbent of E. compressa creates an economic benefit to the producing institution.
Citation Count: 0
INVESTIGATION OF THE RELATIONSHIP BETWEEN NOISE POLLUTION AND ANXIETY
(inst integrative Omics & Applied Biotechnology, 2018) Kıyak, Mithat; Kiyak, Mithat; Budak, Murat Erdem; Sağlık Yönetimi / Healthcare Management
There is a constant interaction between human beings and environment. Environmental factors may affect humans positively, although some other negative effects may also arise. For example, noise pollution is one of the physical parameters that may negatively affect human organism. Showing up in industrialized countries, noise attracts attention as a significant pollution factor. Noise pollution leads to many diseases as it influences physiological processes in the body. It also triggers some psychological disorders by influencing human psychology. One of those disorders is known as anxiety. Noise can shape one's cognitive assessments causing the brain to respond with the feeling of distress or anxiety. Whether or not noise will cause anxiety depends on many variables, such as personality, coping strategies and the person's previous mental status. It is also known that noise is associated with phobic anxiety as well. Based on the given circumstances, this study aims to investigate the relationship between anxiety and the noise existing in educational settings. A qualitative design; descriptive research was used in the study. The sample of the study consists of 339 students studying8 at Okan University. The study was conducted in two stages. In the first stage, noise level was detected in various places located in Okan University using the Cesva DC311 model device with T240385 serial number while in the second stage the Beck Anxiety Inventory was applied to students with the aim of investigating the relationship between noise and anxiety. The data obtained from the research were analyzed using Statistical Packages for Social Sciences (SPSS 21.0 version). Following the analyses carried out, it has been found that individuals are more likely to have anxiety problems in places where higher noise levels exist.
Citation Count: 1
The local and global dynamics model of a cancer tumor growth
(Taylor & Francis Ltd, 2023) Shakhmurov, Veli; Sahmurova, Aida
We study here, spatially homogeneous mechanistic mathematical models describing the interactions between a malignant tumor and the immune system and phase-space analysis of a certain mathematical model of tumor growth with an immune responses. Mathematical modeling of this process is viewed as a potentially powerful tool in the development of improved treatment regimens. We study some features of local and global behavior the multipoint problem for the three-dimensional tumour growth model system obtained by de Pillis and Radunskaya in 2003, with dynamics described in terms of densities of three cells populations: tumor cells, healthy host cells and effector immune cells. We found sufficient conditions, under which trajectories from the positive domain of feasible multipoint initial conditions tend to one of equilibrium points. The addition of a drug term to the system can move the solution trajectory into a desirable basin of attraction. We show that the solutions of the model with a time-varying drug term approach can be evaluated in a more fruitful way and down to earth style from the point of practical importance than the solutions of the system without drug treatment, in the condition of stimulated immune processes, only.