Mirlan MOLDOBAYEV | Zarlık MAYMEKOV

Article | 2023 | Theoretical Foundations of Chemical Engineering57 ( 5 )

To predict and evaluate the carbon footprint in the gas phase, furnace fuel oil oxidation in excess air (alpha factor 1.3) was studied over a wide temperature (T 298–3000 K, P 0.1 MPa). Equilibrium thermodynamic parameters (entropy, enthalpy, and internal energy) and the concentration distributions of C-, S-, N-, O-, and H-containing components and active particles in the gas phase were determined. Based on the total concentration distribution of C-, S-, N-, O-, and H-containing components and active particles in the gas phase, the weight content of carbon was calculated. Taking into account the chemical matrix of the furnace fuel o . . .il–air system and the weight content of carbon, the man-made load of carbon in the gas phase was found. The results of the work made it possible to evaluate the carbon footprint in the gas phase because of the combustion of fuel, in particular, furnace fuel oil in air. Reduction of the man-made load of carbon oxides (CO, CO2) in the gas phase was achieved by modifying and burning furnace fuel oil in the form of oil-in-water (reverse) emulsions in E-1/9M industrial boilers. Keyword: carbon footprint; concentration distribution; furnace fuel oil–air; gas phase; man-made loa More less

Özgül SALOR-DURNA

Proceedings Paper | 2023 | IEEE Industry Applications Society Annual Meeting

The research work presented in this paper proposes a method for modeling the behavior of the Electric Arc Furnace (EAF) currents for a tap-to-tap time based on the DFT amplitude histograms of the EAF current waves. The method is used to model the EAF current behavior separately for each phase of the EAF operation: boring, melting and refining. The model is verified by comparing the THD histograms and the flicker measurements of the original and modeled EAF current waveforms. The proposed model can be used as an EAF model in the simulation environment for various purposes before the installation of an EAF. The method has low computat . . .ional load compared to various other techniques, since it utilizes only the amplitude distribution parameters of the first 13 frequency components and the one-cycle signal representing the higher order harmonics. The model is novel in the sense that every time the EAF current signal is generated, a unique waveform reflecting the corresponding distributions is generated, which is compatible with the random behavior of the EAF operation. Keyword: EAF current; EAF modeling; electric arc furnace (EAF); power quality; steel makin More less

Camilya SMANALİYEVA | Canıl İSKAKOVA | Cıldız ÖSKÖNBAEVA

Article | 2019 | European Food Research and Technology245 ( 10 )

Wild fruits and berries from the walnut-fruit forests of Kyrgyzstan may hold nutritional and health benefits for humans. Since information on their nutritional value is scarce, physical properties and nutritional value of naturally occurring red, black, and yellow cherry plum fruits (Prunus divaricata Ledeb.) were evaluated. The wild cherry plums featured moisture contents between 81.07 and 85.87%, reducing sugar contents of 6.83-8.42%, alimentary fiber of 0.78-1.38%, ash contents of 0.48-0.74%, acidity levels of 0.97-2.31%, and ascorbic acid concentrations of 16.00-30.25 mg/100 g. The total phenolic concentrations of wild cherry pl . . .um fruits was determined at 177-365 mg/100 g expressed as gallic acid equivalents. The black wild cherry plum contained the highest amounts of polyphenols and anthocyanins among the analyzed samples as well as the domesticated Prunus varieties. The essential mineral profile indicated that zinc (Zn) featured the lowest concentrations with 0.05-0.18 mg/100 g, while potassium (K) was the most abundant mineral at 127.97-188.74 mg/100 g in all cherry plum samples. 100 g fresh wild cherry plum can contribute up to 26.4% of iron (Fe) to recommended dietary allowance. All these results indicate that wild cherry plum fruits can be beneficial for human nutrition. The determination of physical attributes and chemical composition of these fruits is essential to facilitate the establishment of product standards and to further promote the use of these products in the food industr More less

İbrahim AKGÜN

Article | 2023 | Mathematics11 ( 21 )

In this study, we propose a novel multi-objective nonlinear mixed-integer mathematical programming model for the transit network design and frequency setting problem that aims at designing the routes and determining the frequencies of the routes to satisfy passenger demand in a transit network. The proposed model incorporates the features of real-life transit network systems and reflects the views of both passengers and the transit agency by considering the in-vehicle travel time, transfers, waiting times at the boarding and transfer stops, overcrowding and under-utilization of vehicles, and vehicle fleet size. Unlike previous studi . . .es that simplify several aspects of the transit network design and frequency setting problem, the proposed model is the first to determine routes and their frequencies simultaneously from scratch, i.e., without using line and frequency pools while considering the aforementioned issues, such as transfers and waiting. We solve the proposed model using Gurobi. We provide the results of what-if analyses conducted using a real-world public bus transport network in the city of Kayseri in Türkiye. We also present the results of computational tests implemented to validate and verify the model using Mandl benchmark instances from the literature. The results indicate that the model produces better solutions than the state-of-the-art algorithms in the literature and that the model can be used by public transit planners as a decision aid. Keyword: mathematical programming; nonlinear mixed-integer programming; public transport; real-world application; transit network route design and frequency setting problem; urban public transportation; urban transit network desig More less

İbrahim AKGÜN

Article | 2023 | Revista de Psicologia del Deporte / Journal of Sport Psychology32 ( 2 )

The study aims to determine if stress and anxiety reduction techniques may enhance sports performance. We will do a complete assessment of earlier research on mindfulness training and sporting performance to answer this issue. This research study is based on primary data to determine whether the research study used smart PLS Software and generated informative results. The research examines how mindfulness affects stress, anxiety, and attention and how these elements affect athletic performance. We will also examine how stress and anxiety affect athletes' performance and how mindfulness training may help athletes better control these . . . emotions. Our ultimate objective is to offer insightful analysis and suggestions to coaches and athletes who want to improve their performance via mindfulness training. Overall result found that mindfulness training has the potential to significantly impact players' physical, mental, and athletic performance. To assure widespread acceptance and success, more study is required to examine the obstacles to introducing mindfulness training in sports teams and how these obstacles might be removed. Athletes and coaches can enhance performance by integrating mindfulness training and gaining insightful information about an athlete's well-being. Keyword: mindfulness training; stress; anxiety in sport; smart PLS algorith More less

Mehmet KOBYA

Article | 2023 | Journal of Water Process Engineering56

The near-widespread presence of poly- and perfluoroalkyl substances (PFASs) in humans has generated concerns regarding the potential negative impact of these chemicals on human health, as some PFASs are exceedingly persistent and bioaccumulative. Among the perfluorinated PFASs, which exhibit high polarity and strong carbon–fluorine bonds, perfluorooctanesulfonate (PFOS) is one of the frequently encountered species. In this study, the efficiency of electrooxidation (EO) and its application in groundwater simulation were first evaluated as a realistic approach to PFOS removal. After optimizing EO parameters including the solution pH, . . .current density, and the effects of inlet concentration and the anode material, 83 total organic carbon (TOC) removal was obtained. In groundwater experiments, in which the infiltration of PFOS from soil layers into groundwater was simulated, 79 TOC removal efficiency was achieved in the more complex groundwater; moreover, an F− ion concentration of 8.78 mg/L was obtained from the decomposition of PFOS. To increase the realism of the simulation, the leachate process was repeated four times, and the EO process was applied to each sequential leachate. In addition, the process efficiency was studied in real landfill leachate wastewater to which PFOS had been added. Despite the challenging wastewater composition, 84 TOC removal efficiency was achieved. Together, these results indicate that BDD-anodic oxidation may be a practical method to treat PFOS-contaminated groundwater and wastewater. Keyword: electrochemical treatment; groundwater treatment; landfill leachate treatment; PFAS More less

Canıl İSKAKOVA

Article | 2023 | MANAS Journal of Engineering (MJEN)11 ( 1 )

Maksym is a Kyrgyz ethnic beverage made from milled cereals such as wheat, barley, or maize, boiled in water, and then fermented using yeast and lactic acid bacteria as a starter culture. The aim of this study was to investigate the changes in the consistency and sensory properties of Maksym after industrial production during refrigerated storage. The acidity of the beverage increases and the total soluble solids decrease after 21 days. The amount of lactic acid bacteria (LAB) and yeast after production were 9.36 and 9.46 log cfu/mL, respectively. After 21 days it is indicated that the amount of both starter cultures decreased by 2 . . .log units. In terms of acceptability, the sensory properties after 7 days of storage received the highest rating. However, the acidic taste after 21 days of storage received the lowest rating. Rheological measurements carried out at 5, 10, 20, and 30°C also revealed these changes. Four rheological models (Newtonian, Herschel-Bulkley, Ostwald De-Waele, and Casson) were used to describe the flow behaviour of the beverage. The Casson model was superior to other rheological models. The effective viscosity of Maksym was decreased from 2.66 to 1.96 mPa·s after 21 days of cold storage. The activation energy was decreased from 23.10 and 14.94 kJ/mol and indicated the thinning of viscosity of the beverage. The obtained parameters can be used to predict the shelf-life model and product labelling by its expiry period, as well as to control the quality of Maksym. Keyword: maksym; fermented beverage; rheological properties; microbiology; sensory; storag More less

Cumagül Nurakun Kızı | Rita İSMAİLOVA

Article | 2018 | Interactive Learning Environments26 ( 8 )

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 scope of this work, namely, technical chara . . .cteristics of LMS, ease of use, feedback options of LMS and advantages of LMS use, were also found to be significant for students in their success in online courses. In interviews with instructors, three main points were highlighted, namely, problem with students’ perception of online courses, lack of online education experience among instructors and administrative issue More less

Nurzat TOTUBAYEVA | Kanatbek KOCOBAYEV

Article | 2020 | Успехи современного естествознания ( 5 )

В работе представлены результаты экспериментов фиторемедиации нефтезагрязненной почвы полигона опасных отходов рудника Кумтор. Целью настоящей работы был подбор высокогорных растений, произрастающих в суровых условиях высокогорья рудника Кумтор на высоте более 3600 м над уровнем моря, для фиторемедиации грунтов, загрязненных нефтепродуктами. Были отобраны 2 вида местных растений: овсяница луговая (Festuca pratensis) и плевел многолетний (Lolium perenne). Изучались такие параметры тест-культур, как всхожесть, энергия прорастания, длина подземной и надземной частей. Отмечено, что умеренное нефтезагрязнение грунтов оказывает ростстимул . . .ирующее действие на всхожесть и токсическое действие на рост и развитие растений на более поздних сроках. К 20-м суткам произрастания отмечалось ростстимулирующее действие, а к 40-м суткам роста усиливалось токсическое воздействие. К 40-м суткам эксперимента длина корня у плевела многолетнего (Lolium perenne) была длиннее в 2,4 раза, а длина стебля - в 8,1 раза, чем у овсяницы луговой (Festuca pratensis). Рост тест-культур на фоновом образце к 40-м суткам преобладал над испытуемыми вариантами, и длина корня в фоновом образце была в 9,8 раза длиннее по сравнению с плевелом многолетним (Loliumperenne). Но, несмотря на эти факты, испытуемые растения были устойчивы и проявляли способность произрастать на нефтезагрязненной почве. Возможно, что они, произрастая в суровых климатических зонах высокогорья, уже выработали стрессоустойчивые способности, которые успешно могут быть использованы в фиторемедиации нефтезагрязненных почв на завершающем этапе очистных работ More less

Nurudin KIDIRALİYEV

Article | 2015 | Хранение и переработка сельхозсырья ( 3 )

Фасоль отличается высоким содержанием белков и углеводов, а также большим содержанием витаминов, минералов и других полезных веществ, улучшающих состояние процессов, происходящих в организме человека. Чтобы питательные и полезные вещества не уничтожились в процессе приготовления, необходимо знать режимы тепловой обработки этого полезного продукта. Перед тем, как сварить фасоль, нужно ее замачивать. Предварительное замачивание способствует скорому приготовлению и сохранению формы фасоли. Варка фасоли является гидротермическим процессом, в котором сочетается одновременное воздействие теплом и водой, и относится к группе теплообменных . . .процессов производства пищевых продуктов. Авторами статьи изучены изменения в консистенции некоторых сортов фасоли во время их тепловой обработки, установлены режимы варки, определены коэффициенты развариваемости фасоли = Beans are high of protein and carbohydrates, as well as a high content of vitamins, minerals and other nutrients that will improve the processes occurring in the human body. To nutritional and useful substances are not consumed in the cooking process, it is necessary to know the thermal treatment regimes of this useful product. Before you cook the beans, you first need to soak it. Presoaking promotes rapid preparation and preservation of form beans. Cooking beans is a hydrothermal process in which the combined simultaneous action of heat and water, and refers to a group of heat exchange processes of food production. The authors studied the changes in the consistency of some varieties of beans in their cooking, cooking mode is set, the coefficients of beans cooking property More less

Ali Osman SOLAK

Article | 2013 | Sensors and Actuators B: Chemical188

A highly sensitive method for detection of DNA hybridization was developed. This method was based on the modification of glassy carbon electrode with gold nanoparticles (AuNPs) involving p-aminothiophenol (ATP) functionalized graphene oxide (GO). This GO was used as a platform for impedimetric genosensing using 5′-TA GGG CCA CTT GGA CCT-(CH2)3-SH-3′ single-stranded probe (ss-DNA), 5′-AGG TCC AAG TGG CCC TA-3′ (target DNA), 5′-SH-C6-TAG GGC CA-3′ (non-complementary-1) and 5′-SH-C6-TGC CCG TTA CG 3-′ (non-complementary-2) oligonucleotide sequences. The film exhibited excellent properties for immobilizing DNA probes and sensing DNA hyb . . .ridization. The DNA immobilization and hybridization on the film were studied by cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS), and found that the charge transfer resistance (Rct) of the electrode increased with the concentration of the target DNA hybridized with the ss-DNA. The linear detection range was from 1.0 × 10−13 M to 1.0 × 10−7 M and the detection limit was 1.10 × 10−14 M (n = 6). Compared with the other electrochemical DNA biosensors, the proposed biosensor showed its own performance of simplicity, good stability, and high sensitivity. - Keywords: Graphene oxide; Gold nanoparticles; Electrochemical impedance spectroscopy; DNA nanobiosenso More less

Ali Osman SOLAK

Article | 2023 | Revista de Psicologia del Deporte / Journal of Sport Psychology32 ( 2 )

The essential purpose of this research study is to determine the impact of information technology related to motivation and performance in sports. This research study depends upon psychological perspective research based on the primary data analysis to determine the research study develop different questions related to information technology and motivation and the sport's performance. These questions fulfill by different participants who know information technology and motivation. Information technology is the main independent variable, motivation is the mediator variable, and the performance of sport is the main dependent variable. . . . To determine the research study used SPSS software and generated informative results related to variables. The descriptive statistic analysis, the one-way ANOVA test analysis, the regression analysis, variance analysis also that present graphical analysis related to dependent and independent variables. the overall research found that information technology positively impacts motivation and performance in sports. Keywords: information technology; motivation; performance in sports; psychological perspectiv More less