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Найденный: 19 Экземпляр 0.000 sn
Базы данных : Taylor & Francis ✕Факультет / Институт : Mühendislik Fakültes ... ✕
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Close link between Fabry–Pérot resonance and natural-resonance frequencies

Mehmet ERTUĞRUL

Mathematical and numerical analyses have been performed to examine the close link between Fabry–Pérot resonance and natural-resonance frequencies. For the mathematical analysis, the conditions resulting in minimum magnitudes of reflection coefficients in frequency-domain are derived for air-backed and metal-backed low-loss non-dispersive (or weakly dispersive) dielectric samples with relative complex permittivity εr and thickness L for free-space wave propagation at normal incidence. The close relation between Fabry–Pérot resonance and natural-resonance frequencies is demonstrated for three di ...Более

Статья 2023 Mühendislik Fakültesi Waves in Random and Complex Media ( Published online: 23 Jan 2023 ) 48 Просмотры
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Selective Electrochemical Determination of L-Cysteine by a Cobalt Carbon Nanotube (CNT)-Modified Glassy Carbon Electrode (GCE)

Nahit AKTAŞ

L-Cysteine is a semi-essential and proteinogenic amino acid, with the formula HO2CCH (NH2) CH2SH. L-cysteine is mostly found in protein-rich foods. In this study, catalysts consisting of cobalt (Co) supported on carbon nanotubes (CNTs) were prepared using the sodium borohydride (NaBH4) reduction method. These catalysts were characterized by means of energy-dispersive x-ray (EDX) with scanning electron microscopy (SEM), temperature-programmed reduction (TPR), and temperature-programmed oxidation (TPO) techniques. Characterization results confirmed the successful preparation of the desired catal ...Более

Статья 2024 Mühendislik Fakültesi Analytical Letters ( Published online: 12 Jan 2024 ) 21 Просмотры
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Comparison of the Machigin and CAL Methods for Extraction of Plant Available P in Soils

Nurzat TOTUBAYEVA

Fertilizer recommendations for phosphorus (P) are generally based on the soil content of plant available P and the amount of P exported by the harvested crop. In countries of the former Soviet Union (SU), a widespread method is the Machigin extraction. The relationships between soil P contents extracted with this and other European methods are not well established. Here, we compare the Machigin soil P extraction method with the Calcium Ammonium Lactate P(CAL) procedure that is commonly used in Central Europe. Both methods were tested with 94 soil samples originating from Kyrgyzstan, Ukraine, a ...Более

Статья 2024 Mühendislik Fakültesi Communications in Soil Science and Plant Analysis ( Published online: 05 May 2024 ) 0 Просмотры
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Cyber crime risk awareness in Kyrgyz Republic

Rita İSMAİLOVA | Gülşat MUHAMETJANOVA

In this paper we present the information security awareness rate of students in Kyrgyz Republic, where there is a rapid pace of formation and development of the information society. The survey was conducted with a sample of 172 students from different departments of the university. Our research study showed that despite the huge number of reports about computer crimes in the web, the knowledge about cybercrime is quite low and students are mostly not aware of many aspects of computer crime. Analysis was done to determine dependence of information security awareness rate on computer literacy ra ...Более

Статья 2016 Mühendislik Fakültesi Information Security Journal: A Global Perspective 116 Просмотры
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2-Benzo[c]cinnoline and 2-Benzo[c]cinnoline 6-oxide modified glassy carbon electrodes: electrocatalytic reduction of dioxygen in aqueous media

Ali Osman SOLAK

Benzo[c]cinnoline (BCC) molecules were electrochemically grafted onto a glassy carbon (GC) surface in nonaqueous media, and the modified surface was characterized using cyclic voltammetry (CV) with redox probes. Blockage of the electron transfer on the modified surface was observed using redox probes. Electrocatalytic effect of 2BCC modified GC (2BCC-GC) electrode surface towards to the electrochemical reduction of dioxygen was also investigated. A mechanistic scheme for the electrochemical catalysis was proposed. To clarify the mechanism of the dioxygen reduction, a less basic film of 2-benzo ...Более

Статья 2011 Mühendislik Fakültesi Instrumentation Science & Technology39 ( 2 ) 68 Просмотры
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Spectroscopic and Electrochemical Characterization of Benzoylglycine-Modified Glassy Carbon Electrode: Electrocatalytic Effect Towards Dioxygen Reduction in Aqueous Media

Ali Osman SOLAK

Present work aims to create a benzoylglycine (BG)-modified glassy carbon (GC) substrate exploiting the electroreduction of diazonium salts. Dopamine was used to confirm the attachment of benzoylglycine molecules onto the glassy carbon surface by observing the blockage of the electron transfer using cyclic voltammetry (CV). BG-modified GC surface (BG-GC) was also characterized by Raman spectroscopy and electrochemical impedance spectroscopy (EIS) techniques. The ellipsometric thickness of the BG film was measured as approximately 14 nm for seven CV cycles. The electrocatalytic effect of BG-GC e ...Более

Статья 2011 Mühendislik Fakültesi Spectroscopy Letters: An International Journal for Rapid Communication 44 ( 3 ) 53 Просмотры
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Determination of Moisture Transport Parameters of Some Fruits Under Open Sun Drying Conditions

İnci Türk TOĞRUL | Hasan TOĞRUL

In order to determine the behavior of fruits during drying under natural conditions, open sun drying experiments were conducted on apricots, grapes, peaches, figs, and plums. The drying rate curves of these fruit did not contain constant rate period, but showed a falling rate period. In the present work, Biot numbers and the mass transfer characteristics—namely moisture diffusivity and moisture transfer coefficient—of selected fruits were evaluated by drying coefficients (S) and lag factors (G). The experimental results exhibited mass transfer Biot numbers in the range of 0.115–0.158, thus ind ...Более

Статья 2007 Mühendislik Fakültesi International Journal of Green Energy4 ( 4 ) 73 Просмотры
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Screening a Bozo Starter Culture for Potential Application in Beer Fermentation

Canıl İSKAKOVA | Kubat KEMELOV

The aim of this study was to identify yeast strains and hop-tolerant lactic acid bacteria from Bozo, a traditional Kyrgyz-fermented beverage that has been described as a predecessor of today

Статья 2019 Mühendislik Fakültesi Journal of the American Society of Brewing Chemists : The Science of Beer77 ( 1 ) 62 Просмотры
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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 ...Более

Статья 2019 Mühendislik Fakültesi Communications in Soil Science and Plant Analysis50 ( 18 ) 57 Просмотры
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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 ...Более

Статья 2019 Mühendislik Fakültesi Fullerenes, Nanotubes and Carbon Nanostructures27 ( 9 ) 122 Просмотры
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Cybercrime risk awareness rate among students in Central Asia: A comparative study in Kyrgyzstan and Kazakhstan

Rita İSMAİLOVA | Gülşat MUHAMETJANOVA

It is a well-known fact that the system is as secure as its weakest point. Often, organizations and countries invest in the technologies, forgetting that it is impossible to assure information security without raising awareness among users. Therefore, in this study, the cybercrime awareness rate of users in two Central Asian Countries was investigated. As a target group, students of two public universities from each country were chosen. Results of quantitative research showed that in Kazakhstan, gender and age of respondents affect the cybercrime awareness rate, while in Kyrgyzstan, none of th ...Более

Статья 2019 Mühendislik Fakültesi Information Security Journal: A Global Perspective28 ( 4-5 ) 52 Просмотры
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Learning management system implementation: a case study in the Kyrgyz Republic

Cumagül Nurakun Kızı | Rita İSMAİLOVA

In this paper, the determinants of the intention to use online learning management system (LMS) among students in one of universities in the Kyrgyz Republic were studied, using quantitative and qualitative analysis. A total of 541 responses from students, enrolled in online courses during the fall and spring semesters 2016–2017, were used to examine students attitude toward online education. In addition, interviews with six instructors were conducted. Results showed that success of students in e-courses depend on year of education and the academic major of students. Factors, defined in the sco ...Более

Статья 2018 Mühendislik Fakültesi Interactive Learning Environments26 ( 8 ) 48 Просмотры
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