Zamirgül KAZAKBAYEVA

Article | 2023 | Journal of Applied Spectroscopy90 ( 5 )

The luminescence of Er3 ions in silica glasses synthesized by the direct sol–gel–glass transition method and by melting of activated gel grit using various precursors of optical centers was studied. The formation of complex centers including erbium, aluminum, and alkali metal ions was found to be one way of essentially increasing the half-width of the 4 I 13/2 → 4 I 15/2 luminescence band of these ions. Keyword: complex optical centers; luminescence; rare earth ions; sol–gel method

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

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

Ercan ÇELİK

Article | 2023 | Optical and Quantum Electronics55 ( 8 )

Fractional calculus is a field that is currently used in the world’s applications in many science and engineering fields where many models are still being developed and researched. The conformable time-fractional gives the full history of this function, which is the advantage of using fractional calculus to solve physical problems. In this study, the conformable time-fractional extended (2  1)-dimensional quantum Zakharov-Kuznetsov and the time-fractional modified Korteweg-de Vries equations are investigated by using the the modified exp (−Ω(ξ))-expansion function approach. Some new prototype analytical solutions such the hyperbolic . . . and trigonometric function solutions are successfully reached. The importance of current research is to derive new solutions using a strong analytical approach. All the reported solutions in this study have verified their corresponding model. Under the choice of suitable values of the parameters involved, the 3D and 2D to the obtained solutions are successfully plotted. Keyword: conformable derivative; hyperbolic function; the MEFM; trigonometric functio More less

Samandar İSKANDAROV

Article | 2021 | Lobachevskii Journal of Mathematics42 ( 3 )

Sufficient conditions are established such as the sign of the functions of absolute and quadratic integrability on the half-axis of the components of the solution of a linear system of Volterra-type integral equations of the second kind in the new formulation, namely, without the assumption that the components of the free term possess the properties under study. To achieve the intended goals, the matrix method of weight functions, the matrix method of cutting functions, the matrix method of partial cutting of the author, and the method of integral inequalities of Ya. V. Bykov are developed. The results obtained in this paper are gen . . .eralizing for linear scalar and vector integral equations previously considered by the author. Note that some matrix cutting functions introduced introduce a quadratic trinomial of some expressions from the terms of the kernel and the free term in such a way that the core actually absorbs the bad properties of the free term (external force). Note that growth, nonsmoothness, alternating terms of the terms of the kernel and the free term are cut off. It should also be emphasized that the kernel and the free term of the considered system of equations consist additively of two kernels, the terms of the first kernel are cut off by both arguments, the terms of the second kernel are cut off by the second argument, i.e. in part, it is shown that the conditions imposed on these two cores are different, i.e. do not intersect. The introduction of a certain matrix weight function helps to establish the absolute integrability on the half-axis of the solution component of the system under consideration, and it plays a decisive role. At the end, the simplest illustrative example is given, which shows that the results of the present article are also new for the scalar linear integral equation of the Volterra type of the second kind on the semiaxis More less

Gülşat MUHAMETJANOVA

Article | 2021 | International Journal of Mental Health and Addiction21 ( 2 )

The purpose of this study is to investigate the gaming habits, personality traits, and Internet gaming disorder (IGD) of Kyrgyz adolescents. Sociodemographic questions, gaming-related questions, Internet Gaming Disorder Test (IGD-10), and Big Five Inventory (BFI-10) were used to collect data from 248 Kyrgyz adolescents between the ages of 11 and 21 years. The study revealed that most of the participants play digital games for 1 to 10 h a week. Among the game categories, action games are the most preferred one by the participants. Structural equation modelling (SEM) was used to investigate the relationship between Big Five personalit . . .y traits and IGD. The results indicated that neuroticism has a positive and significant relationship with IGD. On the other hand, agreeableness has a negative and significant relationship with IGD. The results indicated that some personality traits have substantial predictive power in determining IGD among Kyrgyz adolescents More less

Nurzat TOTUBAYEVA

Article | 2022 | Arid Ecosystems12 ( 2 )

Soil microflora is one of the first to feel a negative impact and can serve as a biological indicator of changes in the soil structure and the degree of impact on the soil ecosystem. In 2020, studies were carried out at two sites located in the Shamshy Gorge in the Chui region of the Kyrgyz Republic. One of the plots was withdrawn from pasture use for one year in 2020 and two years in 2019 as compared to the actively used control option. The microbiological diversity was studied with conventional methods of microbiology. The micromycetes of the studied soils were represented in the dominance of species resistant to adverse environme . . .ntal factors, Trichoderma, Cladosporium, and Alternaria, i.e., the species diversity was insignificant, with a predominance of representatives of dominant species. A decrease in the anthropogenic load in the studied areas has led to the activation of microbiological processes and a significant increase in soil microbiodiversity, which is indicative of improvement in the enzymatic properties and an acceleration of the soil self-healing process. Studies have also shown that soils in the regime of unregulated overgrazing are significantly susceptible to drying and trampling, which leads to a decrease in microbiological diversity in the soil ecosystem and the dominance of microorganism forms that are resistant to adverse environmental factors. The obtained data suggest that overgrazing affects the structure of soil microbiocenosis, replacing it with more drought-resistant species. Thus, the microbiological diversity of soils subjected to varying degrees of anthropogenic pressure can serve as a biological indicator of the state of the soil ecosystem. It is also necessary to resolve the issue of the regulation of the rotational grazing of livestock, which can also ensure the preservation of pasture productivity and contribute to the conservation of the biological diversity of flora and fauna of pastures, respectively More less

İsmail ERPER | Sezim COLDOŞBEKOVA

Note | 2023 | Journal of Plant Pathology105 ( 3 )

Keywords; penicillium fruit rot; postharvest; pyrus communis; RPB2

Metin BAYRAKTAR | Ruslan SALIKOV

Article | 2019 | Comparative Clinical Pathology28 ( 6 )

The aim of this study was to determine the normal hematological and biochemical parameters of the Thoroughbred Appaloosa horse breeds which reared in Tong and Issık-Kul regions of Kyrgyzstan. Fifty-six (n  56) healthy horse breeds in different ages (0–12 months and 1–5 years) and gender (n  29 male and n  27 female) were clinically examined and blood samples were taken. Red blood cell (RBC) count, white blood cell (WBC) count, the count (#); the percentage () of the lymphocytes (lymph), monocytes (mid), granulocytes (gran); and the values of hemoglobin (HGB), hematocrit (HCT), blood clot cell count (PLT), mean platelet volume (MPV), . . . platelet distribution width (PDW), procalcitonin (PCT), mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC), red cell distribution width (RDW-CV), and red cell distribution standard deviation (RDW-SD) were measured in the blood plasma samples. In addition, creatine phosphokinase (CPK), alanine aminotransferase (ALT), aspartate aminotransferase (AST), gamma-glutamyl transferase (GGT), alkaline phosphatase (ALP), total bilirubin (TBil), direct bilirubin (DBil), triglycerides (TG), total serum protein (TP), albumin (Alb), creatinine (Creat), urea (Urea), amylase (Amy), lipase (Lip), cholesterol (Chol), lactate dehydrogenase (LDH), glucose (GLU), very-low-density lipoprotein (VLDL), low-density lipoprotein (LDL), and high-density lipoprotein (HDL) values were also analyzed in the blood serum samples. Although PLT, MPV, PDW, and PCT values significantly changed between the age groups (P  0.05). However, Creat, DBil, and TBil values were detected significantly (P  0.05) were found. It was the first report for foals and 1–5 aged (adult) horses according to serum LDL, VLDL, and Lip values. Consequently, some hematological and biochemical values were determined and advised as reference values of the Appaloosa foals (0–12 months aged) and adult (1–5 aged) horse breeds in Tong and Issık-Kul region of Kyrgyzstan.Keyword: Appaloosa horse breeds; Biochemistry; Hematology; Kyrgyzstan; Reference value More less

Asan ÖMÜRALİEV | Ramiz RAFATOV

Article | 2011 | Automation and Remote Control72 ( 1 )

For the singularly perturbed parabolic problem, a regularized asymptotics of the solution of the problem of optimal control was constructed. The solution asymptotics involves parabolic boundary-layer functions obeying a special function called the “complementary probability integral.

Olgun DURMAZ

Article | 2024 | Mediterranean Journal of Mathematics21 ( 2 )

Let L4 be a 4-dimensional Lorentzian space with the sign (−,,,). The aim of this study is to investigate the other missing algebraic forms of the constraint manifolds of 2C and 3C spatial open chains in L4. For this purpose, firstly, we obtain the structure equations of a spatial open chain using the equations of open chains of the Lorentz plane and Lorentz sphere. After then, using these structure equations, we search the algebraic forms of the constraint manifolds of 2C and 3C spatial open chains in Lorentzian 3-space with respect to the causal characters of the first link and the axis of rotation of the joint. Keyword: 15A66; 53A . . .17; 53B30; 93B17; constraint manifold; primary 15A30; secondary 70B15; spatial open chain; split quaternion; structure equatio More less

Yılmaz KAYA

Article | 2023 | Journal of Applied Phycology35 ( 2 )

The aim of this study was to isolate and identify Antarctica microalgae collected through the National Antarctic Science Expedition and to examine the growth responses and biochemical contents of Chlorella variabilis under cold and temperate cultivation conditions in growth medium consisting of various nitrogen concentrations under different lighting cycle parameters. In this study, the Antarctic microalgae Chlorella variabilis YTU.ANTARCTIC.001, was cultivated at different temperatures of 4, 13, 20 and 27 °C in modified BG-11 medium with various concentrations of NaNO3 (0, 0.75, 1.5, 2.5 and 3 g L−1) under three photoperiods (8:16, . . . 16:8 and 24:0) to investigate the growth and biochemical compositions. The specific growth rate changed from 0.012 to 0.23 day−1 with an increase in nitrate concentration, temperature and light cycle. The highest specific growth rate was 0.23 day−1 using the growth medium that consisted of 3 g L−1 nitrate at 27 °C under 16:8 h light–dark cycle, while there was no algal growth at 4 °C. Carbohydrate, protein, chlorophyll-a and β-carotene contents of microalgae increased with the increasing concentrations of nitrogen at 20 °C and 27 °C. The highest lipid content was achieved as 66 DW, using the growth medium consisting of 0.75 g L−1 nitrate at 13 °C. This study highlighted that the production of the Antarctic microalgae C. variabilis can be carried out efficiently in temperate conditions by manipulating the growth parameters More less