Yazar "Yilmaz, Ibrahim" seçeneğine göre listele

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    Celiac disease multi-purpose diet plan through integrated goal programming and Interval Type 2 Fuzzy TOPSIS method
    (Pergamon-Elsevier Science Ltd, 2023) Yilmaz, Ibrahim; Polat, Leyla
    Some people are genetically predisposed to Celiac disease, but the process of calling this disease is driven by the ingestion of gluten. This disease affects the person's immune system. Therefore, people must follow a gluten-free diet to prevent the progression of their disease and improve their quality of life. This research aims to raise awareness for celiac patients by providing a novel decision-support model and improving the daily nutritional diets of these patients in line with the determined objectives. A sample gluten-free diet is modeled for low-activity women aged 19-30. In the proposed diet sample, the composition of nutrients and objectives are provided by a dietician. The objective of this study is to minimize these target values in this diet. Celiac disease patients need to meet as much as possible predefined 8 objectives when the patients follow their diet. The Goal Programming (GP) methodology is applied to reach minimum deviations from these 8 objectives. Before GP, a Multi-Criteria Decision Making (MCDM) process is applied to rank and get the weights of objectives. For this process, the Interval Type 2 Fuzzy TOPSIS (IT2FT) method is preferred as an MCDM method. Criteria for IT2FT are determined by examining academic literature and by interviewing relevant dietitians. These criteria are defined as salary, gender, body weight, body length, age, and mobility level. Then, the diet model is created with the information obtained through IT2FT and GP. In the created model, the objectives are determined as constraints. Positive deviations or negative deviations according to the direction of each constraint are included in the calculation together with their weights. In this way, the patient will be fed with the lowest calories and cost, while at the same time she will act following her diet. In conclusion, the values of objectives are minimized.
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    Naked-eye colorimetric and switch-on fluorescence chemosensor based on a rhodamine derivative for Hg2+: Smartphone device, test-kit and food sample applications
    (Elsevier Science Sa, 2023) Genc, Hayriye Nevin; Yasar, Ozlem Guctekin; Elmas, Sukriye Nihan Karuk; Arslan, Fatma Nur; Yilmaz, Ibrahim; Sirit, Abdulkadir
    A new rhodamine-based switch-on fluorescent and colorimetric chemosensor (RHEN) was fabricated for the determination of Hg2+. The RHEN showed a noticeable colorimetric response for Hg2+ from colorless to pink under daylight. When exposed to Hg2+, the fluorescence at 582 nm from the probe RHEN was remarkably enhanced, attend by a color change from colorless to dusty rose color under 365 nm UV lamp. The RHEN had a notable specificity and selectivity for Hg2+ and depicted an excellent sensing performance for detecting lowly concentrated Hg2+ (LOD; 0.11 mu M). The binding phenomenon between RHEN and Hg2+ was identified by Job's method, MALDI TOF-MS and FT-IR spectroscopy. Moreover, the fabricated chemoprobe RHEN was not only utilized to identify Hg2+ in fish samples with satisfactory results (95.28-111.66 %) but also was successfully used for test-paper and cotton swab applications. Smartphone application also showed that RHEN could be used as a potent tool for on-site sensing of Hg2+ without the need for complicated device.
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    A novel highly sensitive carbon-based HMPD/GC sensor electrode: copper ions analysis in flour and water samples
    (Desalination Publ, 2018) Durmus, Nagihan; Yilmaz, Ecir; Mulazimoglu, Aysen Demir; Mercimek, Bedrettin; Cukurovali, Alaaddin; Yilmaz, Ibrahim; Solak, Ali Osman
    In this research, (Z)-2-(2-(hydroxyimino)-2-(3-methyl-3-phenylcyclobutyl) ethyl)-3a,7a-dihy-dro-1H-isoindole-1,3(2H)-dione, HMPD molecule has been grafted to the glassy carbon (GC) electrode surface. The HMPD-modified GC electrode has been originally developed and it used for the quantitative determination of Cu(II) in flour and water samples. The modification steps have been performed using cyclic voltammetry (CV). CV, electrochemical impedance spectroscopy and scanning electron microscopy have been employed for the characterization processes. Cu(II) standard solutions changing from 1.0 x 10(-9) to 1.0 x 10(-3) M have been prepared and the corresponding peak currents have been measured. From the obtained data calibration equation has been calculated I-p = -1.555C(cu) + 15.86 which is having a 0.9974 correlation coefficient. 10.0 mL of flour and water samples have been mixed with 10.0 mL Britton-Robinson (BR) buffer solution (pH = 5.00) and HMPD/GC sensor electrode has been kept in these mixed solutions for 90 min. Differential pulse voltammetric (DPV) technique has been applied for the measurement of the peak currents. After the application of the developed sensor electrode for Cu(II) detection in flour and water samples, Cu(II) ion concentrations have been calculated from the obtained peak current values, 1.97 and 2.46 mu A. The Cu(II) ion concentrations have been calculated as 1.17 x 10(-9) and 2.41 x 10(-9) M, respectively.
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    The synthesis of a novel DDPHC diazonium salt: Investigation of its usability in the determination of phenol and chlorophenols using CV, SWV and DPV techniques
    (Elsevier, 2020) Celik, Haci Hasan; Ozcan, Saniye; Mulazimoglu, Aysen Demir; Yilmaz, Ecir; Mercimek, Bedrettin; Cukurovali, Alaaddin; Yilmaz, Ibrahim
    Electrochemical and spectroelectrochemical properties of newly synthesized diazonium salt of 2-(2-(1,3-dioxo- 3,3a-dihydro-1H-isoindol-2(7aH)-yl)-1-(3 methyl-3-phenylcyclobutyl)ethylidene) hydrazinecarboxamide (DDPHC-DAS) were studied using glassy carbon (GC) electrode. In the current study, surface characterization was performed by cyclic voltammetry (CV). Besides electrochemical impedance spectroscopy (EIS) was used for the electrochemical and spectroelectrochemical characterization. Surface images were obtained using scanning electron microscopy (SEM). After completion of modification and characterization process, DDPHC-DAS surface was examined for the usability for the quantitative determination of phenol and chlorophenol derivatives by using CV, square wave voltammetry (SWV) and differential pulse voltammetry (DPV). Phenol and chlorophenol solutions that were prepared in Britton-Robinson (BR) buffer solution (pH 8-12) were employed in this research. The presented study proves that all of compounds can be quantitatively determined not only simultaneously but also independently.