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Found: 12 Piece 0.001 sn
Publication year : 2019 ✕Department : Kimya Mühendisliği B ... ✕
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Activated carbon obtained from the cotton processing wastes

Külümkan SARTOVA | Emil ÖMÜRZAK | Bakıt BORKOYEV

Activated carbon (AC) was obtained from the cotton (Gossypium malvaceae) processing waste materials. The process was carried out by carbonization at 500–800 °C and subsequent activation at 800 °C by water stream. Cotton biomass is a renewable, low-cost alternative source for textile and food products; however, it hasn't been used for manufacturing of an activated carbon by carbonization in a boiling layer method. Characterization of adsorbents by means of Scanning Electronic Microscope and FT-IR showed that high porosity of carbonized products which was achieved and functional groups were form ...More

Article 2019 Mühendislik Fakültesi Diamond and Related Materials91 180 Views
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Preparation of molecularly imprinted PDMS elastomer for selective detection of folic acid in orange juice

Nahit AKTAŞ

Herein, it is reported an effective method to prepare novel molecularly imprinted polymers (MIP) on poly(dimethylsiloxane) (PDMS) elastomer via a combination of non-covalent imprinting approach and surface initiated reversible addition fragmentation chain transfer (SI-RAFT) polymerization for sensitive and selective detection of folic acid (FA). For this purpose, 2-(2-Methoxyethoxy) ethyl methacrylate (MEOMA), ethylene glycol dimethacrylate (EGDMA), azobisisobutyronitrile (AIBN), FA and dimethylsulfoxide (DMSO) were used as functional monomer, cross-linker, initiator, template molecule, and po ...More

Article 2019 Mühendislik Fakültesi Applied Surface Science471 ( 31 ) 123 Views
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Heavy Metal Levels and Mineral Nutrient Status of Natural Walnut (Juglans regia L.) Populations in Kyrgyzstan: Nutritional Values of Kernels

Bakıt BORKOYEV | Kalıypa SALİYEVA | Ali Osman SOLAK | İbrahim İlker ÖZYİĞİT

In this study, mineral nutrient and heavy metal (Al, Ca, Cd, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn) contents of the walnut kernels and their co-located soil samples collected from the four different zones of natural walnut forests (Sary-Chelek, Arslanbap, and Kara-Alma in Jalal-Abad Region and Kara-Shoro in Osh Region) in Kyrgyzstan were investigated. The highest concentrations for all elements determined in the soil samples were observed in the Sary-Chelek zone whereas the Arslanbap zone was found to be having the lowest concentrations except Fe and Zn. The highest concentrations in the kerne ...More

Article 2019 Mühendislik Fakültesi Biological Trace Element Research189 ( 1 ) 142 Views
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Социальные сети, цифровые образовательные ресурсы и гаджеты в учебном процессе: мнение студентов Кыргызстана и Казахстана

Çinara CUMABAYEVA | Ulan BRİMKULOV

Существует мнение, что использование таких современных информационных технологий, как социальные сети, цифровые образовательные ресурсы, гаджеты и облачные технологии, в образовательном процессе поможет поднять качество образования и сделать его доступным для большего количества студентов. В нескольких университетах Кыргызстана и Казахстана был проведен опрос студентов различных специальностей, позволяющий выявить текущее состояние и отношение студентов к использованию вышеуказанных технологий. Исследование проводилось путем интервьюирования, анкетирования, в котором всего приняло участие 456 ...More

Article 2019 Mühendislik Fakültesi Международный журнал экспериментального образования ( 1 ) 83 Views
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New Voltammetric Approach to the Quantitation of Paracetamol in Tablets and Syrup using Chemometric Optimization Technique

Ali Osman SOLAK

A new voltammetric approach was developed for the determination of paracetamol in tablet and syrup samples using chemometric optimization. The method is based on the use of the gold nanoparticles-polyaniline (AuNPs-PA) modified pencil graphite electrode (PGE). Electrode system was fabricated by using the electrochemical reduction of gold on aniline modified pencil electrode to give gold nanoparticles. A 3(3) full factorial design was used to find optimal oxidation conditions of paracetamol on the AuNPs-PA-PGE. The optimal oxidation conditions of drug substance were found as -524 mV for the acc ...More

Article 2019 Mühendislik Fakültesi Journal of Analytical Chemistry74 ( 3 ) 51 Views
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Separation of chromium and nickel ions by supported liquid membranes using TOA as carrier

Osman TUTKUN | Kurmancan KAPAROVA

The extensive use of chromium in leather tanning, metallurgy, electroplating and other industries has resulted in the release of aqueous chromium to the subsurface at numerous sites. Cr (VI) has received considerable attention owing to its extensive industrial applications and has long been recognised as a toxic substance due to its strong oxidising potential and the ease with which it can cross the biological membranes. In recent years the application of various solvent extraction technologies to the removal and concentration of chromium have been widely studied; chemical precipitation, ion e ...More

Article 2019 Mühendislik Fakültesi MANAS Journal of Engineering (MJEN)7 ( 1 ) 84 Views
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Development of Nonenzymatic Benzoic Acid Detection on PdSn/GCE/Vulcan XC‐72R Prepared via Polyol Method

Nahit AKTAŞ

In this study a PdSn based sensor was developed for the determination of benzoic acid (BA) in foods. A carbon (Vulcan XC-72R) supported PdSn catalyst was prepared via polyol method and its surface electronic and chemical properties were investigated by advanced surface analytical techniques such as scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD), X-ray Photoelectron Spectroscopy (XPS), temperature-programmed reduction with H-2 (TPR-H-2) and transmission electron microscopy (TEM). Electrochemical measurements were performed by employing cyclic voltammetry (CV) and diffe ...More

Article 2019 Mühendislik Fakültesi Electroanalysis31 ( 6 ) 134 Views
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Urea Uptake and Release by Novel Macrogels from Dimethylacrylamide

Nahit AKTAŞ

A novel macrogels poly(N,N-Dimethylacrylamide) (p(DMAAm)) and its derivatives were synthesized from DMAAm for use in urea uptake and release. p(DMAAm) surface was modified by NaOH and HCl to obtain p(DMAAm)/NaOH and p(DMAAm)/HCl, which are negatively and positively charged, respectively. The dynamic swelling behaviors, water retention and pH sensitivities of the macrogels were studied. It was found that all macrogels exhibited the equilibrium swelling ratio (SR) in the range 1068-1451%. Swelling kinetics showed that the macrogels possessed Fickian diffusion behavior while the diffusion coeffic ...More

Article 2019 Mühendislik Fakültesi Communications in Soil Science and Plant Analysis50 ( 18 ) 57 Views
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3-Acrylamidopropyl-trimethylammoniumchloride cationic hydrogel modified graphite electrode and its superior sensitivity to hydrogen peroxide

Nahit AKTAŞ

A highly sensitive hydrogen peroxide (H2O2) sensor is fabricated by the synthesized 3-Acrylamidopropyl-trimethylammoniumchloride (p(APTMACl)) hydrogel to covered of pen- graphite (PG) electrodes. (p(APTMACl))-PG electrode is characterized using scanning electron microscopy (SEM), Fourier Transform Infrared (FTIR) spectroscopy, and thermogravimetric analysis (TGA). The electrochemical properties of these sensors are investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). The CV behavior of (p(APTMACl))-PG electrode is inve ...More

Article 2019 Mühendislik Fakültesi Fullerenes, Nanotubes and Carbon Nanostructures27 ( 9 ) 122 Views
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Phenol recovery and removal from aqueous solutions by emulsion liquid membranes

Canarbek İZAKOV | Nurzat ŞAYKİYEVA

Emulsion type liquid membrane process is a new and effective method for separation of mixtures with applications in the nuclear industry, hydrometallurgy and wastewater treatment. The emulsified liquid membrane is made by forming an emulsion of two immiscible phases and then dispersing the emulsion in a third phase (i.e. continuous or feed phase). Phenol is mainly found in the wastewaters of such industries as petroleum refineries and petrochemicals. In addition phenol is also contained in the wastewaters of industries of resins, explosives, paper, plastics, glass and rubbers. Numerous solvent ...More

Article 2019 Mühendislik Fakültesi MANAS Journal of Engineering (MJEN)7 ( 2 ) 81 Views
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ПРОЦЕСС АДАПТАЦИИ ВЫСШИХ УЧЕБНЫХ ЗАВЕДЕНИЙ КЫРГЫЗСКОЙ РЕСПУБЛИКИ К НОВЫМ УСЛОВИЯМ

Bakıt BORKOYEV | Akmatali ALİMBEKOV

Цель данного исследования - анализ и оценка истории, особенностей некоторых тенденций адаптации системы высшего образования Кыргызстана, в годы суверенитета к новым общественно-экономическим условиям. В этой связи анализируются структурные и содержательные изменения в системе высшего образования Кыргызстана начиная с эпохи суверенитета, проблемы, вытекающие из данного процесса и состояние их решения. Раскрыты этапы стандартизации высшего профессионального образования и особенности каждого из них. Представлен ход первых реформ в рамках стратегического проектирования в плане интеграции высших уч ...More

Article 2019 Mühendislik Fakültesi Международный журнал экспериментального образования ( 6 ) 86 Views
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АДАПТАЦИЯ ШКАЛЫ УДОВЛЕТВОРЕННОСТИ ЖИЗНЬЮ НА КЫРГЫЗСКИЙ ЯЗЫК: ИЗУЧЕНИЕ ДОСТОВЕРНОСТИ И НАДЕЖНОСТИ

Bakıt BORKOYEV | Akmatali ALİMBEKOV | Kalıypa SALİYEVA | Yavuz Ercan GÜL

В статье представлены результаты исследования психометрических показателей кыргызскоязычной версии шкалы удовлетворенности жизнью. Авторами была разработана кыргызскоязычная версия теста, получены новые данные о его психометрических показателях. Предметом исследования были психометрические показатели кыргызскоязычного варианта шкалы удовлетворенности жизнью - её надежность, валидность, внутренняя согласованность. В экспериментальной группе было 292 (70,4 %) девушки и 113 (29,6 %) юношей, обучающихся на разных курсах по пяти педагогическим направлениям (естественнонаучное, физико-математическое ...More

Article 2019 Mühendislik Fakültesi Международный журнал экспериментального образования ( 6 ) 156 Views
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