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Wyświetlanie 1-10 z 10
Tytuł:
Examination of the Electric Field Intensity Distribution Between Wet Surfaces During Cable Aging Process
Autorzy:
Gunes, I.
Powiązania:
https://bibliotekanauki.pl/articles/1032064.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Cable insulation
electric field
dry band arcing
aging test
Opis:
In this study, electric field effect was investigated by dry band arcing test method. ADSS (all-dielectric self-supporting) cables are usually placed on power grids. These cables are affected by temperature and are exposed to many environmental effects such as wind and UV rays. In this study, the effect of water flow over ADSS cable on electric surface erosion on dry surfaces was investigated by electric arcing method, according to IEEE 1222 standard and the electric field intensity at the surface and the electric potential distribution were analyzed using the finite element method.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 548-550
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue Test with Stochastic Differential Equation Modeling
Autorzy:
Eroglu, E.
Guney, I.
Gunes, I.
Powiązania:
https://bibliotekanauki.pl/articles/1490739.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.10.Gg
81.40.Np
05.45.-a
Opis:
In this study, a mathematically polymeric insulator material is modeled which is used as a solid insulator in the industry. ASTM D 2303 in inclined plane test method is utilized in order to observe mechanical effect of vibration. The materials have different deformation times before they are fatigued or not fatigued. Our goal is the mathematical model which has materials at progressive times.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 36-38
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical Modeling of Heat Effect on Cable Insulation
Autorzy:
Eroglu, E.
Guney, I.
Gunes, I.
Sener, E.
Powiązania:
https://bibliotekanauki.pl/articles/1031951.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.90.+p
88.20.td
Opis:
In the electric power industry, the cost of energy, its longevity and safety of transferring are important problems. Security problems, environmental effects, discharging occurrences and the endurance of the transporters are the problems that exist as a consequence of the high voltage necessity for the transmission of big amounts of energy and which need to be solved. ADSS (all dielectric self-supporting) cables are generally installed on high voltage transmission lines. They are mostly used in such situations, as high temperature, strong winds and direct sunshine and, as the effect, the UV radiation, etc. The solid materials are in use more frequently than gas or liquid ones. Decent dielectric materials need to be sturdy to puncturing and highly invulnerable for mechanical issues. Moreover, they have to perform and resist well the chemical reactions and high temperature, so that they would not be easily effected by the environmental factors. In this study, the mathematical modeling of heat effects on ADSS cables is investigated by using dry band arcing (IEEE 1222 Electrical surface degradation) test method. A heat source is introduced into the test setup, to evaluate the performance of poly-ethylene cable jackets on ADSS cables at different temperatures. Test results indicate that the endurance of the ADSS cables decreases with the increasing temperature.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 539-541
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Wear Strength of Blast Furnace Slag Blended Polymer Materials
Autorzy:
Gunes, I.
Uygunoğlu, T.
Evcın, A.
Ersoy, B.
Powiązania:
https://bibliotekanauki.pl/articles/1031753.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Blast furnace slag containing
Epoxy composites
Hardness
Abrasive wear
Dynamic friction
Surface roughness
Opis:
Having symmetrical and balanced material properties, polymer matrix composites are increasingly becoming popular due to easiness of construction and are use in the production of aerospace and automotive structures. In the study, we developed polymer composites based on epoxy resins, containing up to 40 wt.% of blast furnace slag and determined their pin-on-disc dynamic friction, wear, Shore hardness and surface roughness values. Wear tests were performed using a pin-on-disc under dry friction conditions, at the loads of 5, 10, 15 and 30 N, using slip velocity of 0.3 m/s and along distance of 500 m. The hardness and wear resistance values increased with the increase in the content of blast furnace slag. Showing the relationship between wear rate and hardness, an equation with parameters dependent on load was provided. There was an increase in the dynamic friction with an increase in the surface roughness. In addition, dynamic friction was an increasing function of the wear rate. The wear surfaces of the polymer composites were analyzed using scanning electron microscopy. It was observed that the wear rate of the epoxy composites and pure epoxy samples ranged from 19.85 to 171.42 mm³/Nm.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 599-603
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The diagnostic importance of coagulation parameters in cattle having natural theileriosis
Autorzy:
Gunes, V.
Onmaz, A.C.
Keles, I.
Varol, K.
Ekinci, G.
Powiązania:
https://bibliotekanauki.pl/articles/31055.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The purpose of this study was to determine the diagnostic importance of coagulation parameters in cattle with natural theileriosis. Nine Holstein cross-breed cattle with theileriosis as infected group and 6 healthy Holstein cattle as control group were used in the present study. Mean fibrinogen level, thrombin time (TT), activated partial thromboplastin time (aPTT) and prothrombin time (PT) were not statistically different when control and infected groups compared, except for the D-dimer concentration. Quantitative D-dimer concentrations were determined by immune-turbidimetric assay. D-dimer values increased significantly (p<0.05) in infected group (631.55 ± 74.41 μg/L) compared to control group (370.00 ± 59.94 μg/L). D-dimer sensitivity and specificity were also determined at cut-off concentrations (372 μg/L). Sensitivity and specificity of D-dimer values were determined to be 88.89% and 83.33%, respectively. D-dimer is thought to be important indicator in the evaluation of the prognosis in theileriosis cases. Analysis of D-dimer values before and after treatment in controlled case studies were suggested in future studies to enlighten the issue.
Źródło:
Polish Journal of Veterinary Sciences; 2017, 20, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
1H-Benzimidazole derivatives as mammalian DNA topoisomerase I inhibitors
Autorzy:
Alpan, A
Gunes, H
Topcu, Zeki
Powiązania:
https://bibliotekanauki.pl/articles/1040939.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
1H-benzimidazole derivatives
type I DNA topoisomerase
plasmid supercoil relaxation assays
Opis:
Benzimidazole is one of the most important heterocyclic groups manifesting various biological properties, such as antibacterial, antifungal, antimicrobial, antiprotozoal and antihelmintic activities. Several benzimidazole derivatives are also active as inhibitors of type I DNA topoisomerases. In this study, three 1H-benzimidazole derivatives with different electronic characteristics at position 5-, namely 5-chloro-4-(1H-benzimidazole-2-yl)phenol (Cpd I), 5-methyl-4-(1H-benzimidazole-2-yl)phenol (Cpd II) and 4-(1H-benzimidazole-2-yl)phenol (Cpd III), were synthesized and evaluated for their effects on mammalian type I DNA topoisomerase activity using quantitative in vitro plasmid supercoil relaxation assays. For the structure elucidation of the compounds, melting points, UV, IR, 1H NMR, 13C NMR, mass spectral data and elemental analyses were interpreted. Among the compounds, 5-methyl-4-(1H-benzimidazole-2-yl)phenol (Cpd II) manifested relatively potent topoisomerase I inhibition.
Źródło:
Acta Biochimica Polonica; 2007, 54, 3; 561-565
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perception of health, obesity risk and dietary habits in youth
Percepcja zdrowia, świadomość ryzyka otyłości i nawyki żywieniowe u młodzieży
Autorzy:
Calisir, H.
Gunes, Z.
Ozvurmaz, S.
Powiązania:
https://bibliotekanauki.pl/articles/2053452.pdf
Data publikacji:
2019
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
obesity
adolescents
eating behaviour
health perception
risk awareness
otyłość
młodzież
nawyki żywieniowe
percepcja zdrowia
świadomość ryzyka
Opis:
Background. The aim of this study was to determine the relationship between eating behaviour, health perception and obesity risk awareness in adolescents. Material and methods. This cross-sectional study was completed with 579 adolescents. Stratified and simple random sampling methods were used in the selection of the high schools, classes and students. The data was collected through the information form, Dutch Eating Behaviour Questionnaire and Perception of Health Scale. Results. The mean score of health perception of the adolescents was 52.34±7.59. There was a positive relationship between total health perception score and emotional eating behaviour score of the adolescents (p=0.003). There was a negative relationship between total health perception score restricted eating behaviour (p=0.029), and external eating behaviour score (p<0.001). The emotional eating behaviour (p=0.007), external eating behaviour (p=0.001) and total eating behaviour score (p<0.001) of the adolescents who believed they had an obesity risk were found to be higher than the adolescents who believed they did not. Conclusions. The adolescents with better health perception are less affected by the environment and are able to restrict their food choices. The adolescents who think that they have an obesity risk consume more food due to their emotional state and external exposure.
Wprowadzenie. Praca miała na celu określenie związku pomiędzy percepcją zdrowia, świadomością ryzyka otyłości a nawykami żywieniowymi u młodzieży. Materiał i metody. To przekrojowe badanie zostało przeprowadzone wśród 579 nastolatków. W doborze szkół, klas i studentów wykorzystano próbę warstwową i proste losowe metody selekcji. Dane zebrano z wykorzystaniem formularza, kwestionariusza postrzegania zdrowia i holenderskiego kwestionariusza nawyków żywieniowych. Wyniki. Średni wynik percepcji zdrowotnej uczestników w badanej grupie określono jako 52,34±7,59. Istniała pozytywna zależność pomiędzy całkowitą percepcją zdrowia uczestników a ich nawykami żywieniowymi (p=0,003), oraz negatywna zależność pomiędzy oceną ich ograniczonych nawyków żywieniowych (p=0,029) a zewnętrznymi nawykami żywieniowymi (p<0,001). Wyniki emocjonalnych nawyków żywieniowych osób, które uważają, że są zagrożone otyłością (p=0,007), ich wyniki zewnętrznych nawyków żywieniowych (p=0,001) oraz zachowania (p=0,001) były wyższe niż u tych osób, które uważały, że nie są zagrożone otyłością. Wnioski. Środowisko ma mniejszy wpływ na młodych ludzi, których charakteryzuje wyższy poziom percepcji zdrowia, a także którzy ograniczają swój wybór żywności. Z drugiej strony ci, którzy sądzą, że są zagrożeni otyłością, spożywają więcej pokarmu z powodu stanów emocjonalnych i wpływów zewnętrznych.
Źródło:
Health Problems of Civilization; 2019, 13, 1; 60-66
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance comparison of ToA and TDoA based tracking in underwater multipath environments using bernoulli filter
Autorzy:
Gunes, Ahmet
Powiązania:
https://bibliotekanauki.pl/articles/32917889.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
underwater target tracking
bernoulli filter
Time-of-Arrival
Time-Difference-of-Arrival
underwater multipath propagation
Opis:
Underwater localization and tracking is a challenging problem and Time-of-Arrival and Time-Difference-of-Arrival approaches are commonly used. However, the performance difference between these approaches is not well understood or analysed adequately. There are some analytical studies for terrestrial applications with the assumption that the signal arrival times are not correlated. However, this assumption is not valid for underwater propagation. To present the distinct nature of the problem under the water, a high-fidelity simulation is required. In this study, Time-of-Arrival and Time-Difference-of-Arrival approaches are compared using a ray tracing based propagation model. Moreover, basic methods to mitigate the multipath propagation problem are also implemented for Bernoulli filters. Since the Bernoulli filter is a joint detection and tracking filter, the detection performance is also analysed. Comparisons are done for all combinations of filter and measurement approaches. The results can help to design underwater localization systems better suited to the needs.
Źródło:
Polish Maritime Research; 2023, 1; 135-144
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applying autoregressive models in analysis of GRACE-Mascon time-series
Autorzy:
Gunes, Ozge
Aydin, Cuneyt
Powiązania:
https://bibliotekanauki.pl/articles/43852812.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
model autoregresyjny
modelowanie geoidy
gospodarka wodna
GRACE Mascon
equivalent water thickness
temporal correlation
colored noise
autoregressive model
Opis:
This study discusses how to model the noise in a Gravity Recovery and Climate Experiment (GRACE)-Mascon derived Equivalent Water Thicknesses (EWT) time-series. GRACE has provided unique information for monitoring variations in EWT of continents in regional or basin scale since 2002. To analyze a GRACE EWT time-series, a standard harmonic regression model is used, but usually assuming white noise-only stochastic model. However, like almost all kinds of geodetic time-series, it has been shown that the GRACE EWT time-series contains temporal correlations causing colored noise in the data. As well known in geodetic modelling studies, neglecting these correlations leads to underestimating the uncertainties, and so misinterpreting the significancy of the parameter estimates such as trend rate, amplitudes of signals etc. In this study, autoregressive noise modeling, which has some advantageous compared to the approaches and methods frequently applied in geodetic studies, is considered for GRACE EWT time series. For this aim, three important basins, namely theYangtze, Murray–Darling and Amazon basins have been examined. Among some applied autoregressive models, the ARMA(1,1) model is obtained as the best-fitting noise model for analyzing the EWT changes in each basin. The obtained results are discussed in terms of forecasting, significancy and consistency with GRACE-FO mission.
Źródło:
Advances in Geodesy and Geoinformation; 2022, 71, 2; art. no. e25, 2022
2720-7242
Pojawia się w:
Advances in Geodesy and Geoinformation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of plant growth promoting rhizobacteria on growth, nutrient, organic acid, amino acid and hormone content of cauliflower (Brassica oleracea L. var. botrytis) transplants
Wpływ ryzobakterii stymulujących rozwój na wzrost, zawartość substancji odżywczych, kwasów organicznych, aminokwasów i hormonów u rozsady kalafiora (Brassica oleracea L. var. botrytis)
Autorzy:
Ekinci, M.
Turan, M.
Yildirim, E.
Güneş, A.
Kotan, R.
Dursun, A.
Powiązania:
https://bibliotekanauki.pl/articles/11542866.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
plant growth promoting rhizobacteria
rhizobacteria
growth
nutrient content
organic acid content
amino acid content
hormone content
cauliflower
Brassica oleracea var.botrytis
transplant
Opis:
This study was conducted to determine the effect of different plant growth promoting rhizobacteria (PGPR) strains on growth and quality of cauliflower transplants under greenhouse conditions. The strains of Bacillus megaterium TV-3D, B. megaterium TV-91C, Pantoea agglomerans RK-92, B. subtilis TV-17C, B. megaterium TV-87A, B. megaterium KBA-10 were used in this study. The results of this study showed that different bacterial inoculations increased plant growth parameters such as fresh shoot weight, dry shoot weight, root diameter, root length, fresh root weight, dry root weight, plant height, stem diameter, leaf area and chlorophyll contents of cauliflower transplant respectively. Except for abscisic acid (ABA), the values of gibberellic acid (GA), salicylic acid (SA), indole acetic acid (IAA) was increased by ratio of 23.64, 89.54 and 25.63%, respectively in compared to the control by application of B. megaterium KBA-10 and P. agglomerans RK-92. The amount of organic acids with B. subtilis TV-17C PGPR applications have increased at a ranging ratio from 9.63 to 186.02%. Also, PGPR inoculations increased the macro and micro nutrient content of cauliflower transplants. As a result, the use of bacteria treatments may provide a means of improving transplant growth and quality in cauliflower.
Badanie przeprowadzono w celu określenia wpływu różnych szczepów ryzobakterii stymulujących wzrost roślin (PGPR) na wzrost i jakość rozsady kalafiora w warunkach szklarniowych. Wykorzystano szczepy Bacillus megaterium TV-3D, B. megaterium TV-91C, Pantoea agglomerans RK-92, B. subtilis TV-17C, B. megaterium TV-87A, B. megaterium KBA-10. Z badań wynika, że różne bakteryjne inokulacje zwiększają takie parametry wzrostu roślin, jak świeża masa pędów, sucha masa pędów, średnica korzenia, długość korzenie, świeża masa korzenia, sucha masa korzenia, średnica łodygi, powierzchnia liścia oraz zawartość chlorofili w rozsadzie kalafiora. Z wyjątkiem kwasu abscysynowego (ABA), zawartości kwasu giberelinowego (GA), kwasu salicylowego (SA) oraz kwasu indolilooctowego (IAA) – dzięki aplikacji B. megaterium KBA-10 oraz P. agglomerans RK-92 – zwiększyła się odpowiednio o 23,64, 89,54 i 25,63% w porównaniu z kontrolą. Ilość kwasów organicznych przy aplikacji B. subtilis TV-17C PGPR zwiększała się zmiennie, z 9,63 do 186,02%. Szczepienia PGPR zwiększały też zawartość makro- i mikroelementów w rozsadzie kalafiora. W rezultacie, zabiegi z użyciem bakterii mogą być środkiem polepszania wzrostu i jakości kalafiora.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2014, 13, 6; 71-85
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-10 z 10

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