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Wyświetlanie 1-5 z 5
Tytuł:
Use of Pinched Sluice in Albite Concentration
Wykorzystanie wzbogacalnika poziomo-prądowego do wzbogacania albitu
Autorzy:
Polat, E.
Aksoy, A. A.
Bozkaya, A.
Tunc, S.
Kucukler, M.
Guler, T.
Powiązania:
https://bibliotekanauki.pl/articles/318995.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
albit
mika
wzbogacanie grawitacyjne
efekt kształtu
albite
mica
gravity concentration
shape effect
Opis:
Albite (NaAlSi3O8) is an important industrial mineral especially for ceramic and glass production. Major Fe-containing impurity of albite ore is flaky mica minerals. This study was conducted to determine the applicability of pinched sluicing for pre-concentration of albite ore by exploiting shape effect. Effects of feed solid rate, tilting angle of pinched sluice, and splitter position on the rejection of Fe-containing flaky mica were tested. Pulp solid rate was determined to be the most important variable on the rate of mica rejection. Increasing the tilting angle adversely affected the separation efficiency especially above 17°. Distribution of gangue mica in the vertical cross-section of flowing film was tested manipulating the splitter height. Mica particles were observed to be crowded in upper layers of film thickness. So, flaky mica impurity was thought to be separated from feldspar ore, and a pre-concentrate was obtained. All Fe-containing coloring impurities could not be removed due to different mineralogical origins of them in the ore. Optimum operating variables were determined as follows: 56% feed solid rate, 17° tilting angle of pinched sluice, and splitter height lower or closer to 2/3 of the total pulp film thickness. Pulp solid rate of underflow stream almost linearly changed with respect to splitter height.
Albit (NaAlSi3O8) jest ważnym surowcem przemysłowym, szczególnie w ceramice i produkcji szkła. Najważniejszymi zanieczyszczeniami żelazowymi występującymi w albicie jest łuskowata mika. Celem badan było określenie możliwości wykorzystania wzbogacalnika poziomo-prądowego do wstępnego wzbogacania albitu z wykorzystaniem analizy kształtu. Badano wpływ natężenia przepływu nadawy, zawartości fazy stałej, geometrii strugi nadawy na efekt wydzielenia miki zawierającej zanieczyszczenia minerałami żelaza. Zawartość fazy stałej w nadawie została określona jako najważniejszy czynnik wpływający na efektywność procesu. Zwiększenie kąta nachylenia komory roboczej niekorzystnie wpływało na separację, szczególnie powyżej 17°. Badano wpływ rozdział miki w przekroju poprzecznym strumienia nadawy. Ziarna miki koncentrowały się w górnych warstwach strumienia. Stwierdzono, że drobne ziarna miki oddzielają się od rudy skaleniowej i można otrzymać prekoncentrat. Z uwagi na sposób występowania zanieczyszczeń nie można wydzielić wszystkich zanieczyszczeń barwiących. Określono optymalne parametry procesu: zawartość fazy stałej w nadawie 56%, kąt nachylenia rynny podawczej 17°, a wysokość rozdzielacza strugi niższa od 2/3 całkowitej grubości warstwy materiału.
Źródło:
Inżynieria Mineralna; 2017, R. 18, nr 1, 1; 33-38
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the exponential stability of a neutral differential equation of first order
Autorzy:
Gözen, M.
Tunç, C.
Powiązania:
https://bibliotekanauki.pl/articles/357744.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
GES
global exponential stability
NDE
neutral differential equation
time-varying delays
globalna stabilność wykładnicza
równanie różniczkowe neutralne
opóźnienia zmienne w czasie
Opis:
In this work, we establish some assumptions that guaranteeing the global exponential stability (GES) of the zero solution of a neutral differential equation (NDE). We aim to extend and improves some results found in the literature.
Źródło:
Journal of Mathematics and Applications; 2018, 41; 95-107
1733-6775
2300-9926
Pojawia się w:
Journal of Mathematics and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Characteristics of the Boron Doped MnO Films Deposited by Spray Pyrolysis Method
Autorzy:
Bedir, M.
Tunç, A.
Öztas, M.
Powiązania:
https://bibliotekanauki.pl/articles/1398927.pdf
Data publikacji:
2016-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Nr
78.20.-e
Opis:
Boron doped MnO films were prepared by spray pyrolysis technique at 375°C substrate temperature, which is a low cost and large area technique to be well-suited for the manufacture of solar cells, using boric acid (H₃BO₃) as dopant source, and their properties were investigated as a function of doping concentration. Boron doping was achieved by adding 0.1 M, 0.2 M, 0.3 M, and 0.4 M H₃BO₃ to the starting solution. X-ray analysis showed that the films were polycrystalline fitting well with a cubic structure and have preferred orientation in (111), (220) and (311) directions. Optical band gap of the undoped and B-doped MnO films were found to vary from 2.25 to 2.54 eV. The changes observed in the energy band gap and structural properties of the films related to the boric acid concentration are discussed in detail.
Źródło:
Acta Physica Polonica A; 2016, 129, 6; 1159-1164
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of cow manure and liquid vermicompost applications on growth and seed yield of dry beans
Autorzy:
Basdemir, F.
Ipekesen, S.
Tunc, M.
Elis, S.
Bicer, B.T.
Powiązania:
https://bibliotekanauki.pl/articles/54158596.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
With its porous structure, high water storage capacity and high levels of macro- and micronutrients, vermicompost can play an effective role in plant growth and development. The purpose of this research is to reduce the use of inorganic fertilizers in large agricultural holdings where dry beans are grown to protect soil and crop health, and to popularize the use of cow and worm manure. The research was carried out from April to August of 2020 and 2021, in the Faculty of Agriculture of Dicle University in the southeastern Anatolia of Turkey, and the aim was to evaluate the effect of separate and combined applications of cow manure (2.5, 5.0 and 10 t ha-1) and liquid vermicompost (recommended 50% and 100%) on the growth, yield and yield components of dry bean (Phaseolus vulgaris L.). The experiment was laid out in the randomized complete block design with three iterations. The soil was treated with vermicompost as foliar spray at the crop’s flowering stage and with cow manure – during sowing. Plant samples for growth parameters were collected every 20 days starting from 20 days after emergence (DAE) until maturity, and plots were harvested for yield and yield components. Differences among the applications were significant for growth, yield, and yield components. 10 t ha-1 of cow manure + 100% recommended dose of vermicompost produced high levels of vegetative parts, such as leaves and stems until 80 DAE, but the highest seed yield (14.2 g plant-1) and yield components were achieved in the 5 t ha-1 of cow manure + 100% recommended dose of vermicompost combination. Even a separate vermicompost application increased in the vegetative parts and yield components of bean plants compared to control.
Źródło:
Journal of Elementology; 2022, 27, 4; 819-830
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of particle shape properties on selective separation of chromite from serpentine by flotation
Autorzy:
Guven, Onur
Serdengecti, M. Tayhan
Tunc, Berivan
Ozdemir, Orhan
Karaagaclioglu, Ibrahim E.
Çelik, Mehmet S.
Powiązania:
https://bibliotekanauki.pl/articles/1845205.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chromite
serpentine
morphology
flotation
mineral mixtures
Opis:
Although many studies have been conducted on the morphological variations and its effects on flotation recoveries of a single mineral system, a systematic study for the flotation behavior of mixtures of minerals has not dwelled much. In this study, th flotation behavior of chromite and serpentine minerals was investigated to distinguish and isolate the contribution of morphology in single and binary systems. For this purpose, the shape analyses for the minerals ground as single and mixture were performed, and their flotation behaviors determined with the micro-flotation experiments. Additionally, the zeta potential measurements were carried out in the presence of sodium oleate as a collector. The shape analysis of the ground samples showed that while the roundness values of chromite and serpentine (gangue) minerals as single were quite different, the particle shape of chromite favored serpentine in the mixture system which in turn suggested that the mineral with the high hardness value dominates the shape characteristics in binary grinding conditions. Accordingly, while the flotation characteristics of chromite in the mixture followed the same trend with the flotation of a single chromite system as a function of particle shape, almost a reverse trend was obtained for the shape and flotation of serpentine in the mixture compared to a single serpentine system. Thus, at roundness values of chromite particles from 0.797 to 0.732, the flotation recoveries of chromite in the mixture increased from 51.0% to 75.4%. On the other hand, likewise chromite, the flotation recoveries of serpentine increased from 20.0% to 37.3% proportional to the roundness range of 0.757 and 0.709. These findings in turn showed that the grinding conditions dictate the soft component to be monitored by the harder and denser component which dominates the angularity and floatability of the mixture.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 5; 818-828
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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