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Wyświetlanie 1-7 z 7
Tytuł:
Theoretical Study on the Pressure Induced $T_c$ Change in $YBa_2Cu_3O_x$
Autorzy:
Milić, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399323.pdf
Data publikacji:
2013-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.62.Fj
74.72.-h
Opis:
Pressure effect on the critical temperature, $T_{c}$, of the $YBa_2Cu_3O_x$ superconductor was considered in the frame of a simple theoretical model which as a starting point assumes that $T_{c}$ vs. pressure, P, dependence can be described by an inverted parabola. Available experimental results on $T_{c}$ behavior under pressure were analyzed as a function of the zero pressure hole concentration in the superconducting $CuO_2$ planes, $n_{h}(P = 0 GPa) = n_{h0}$, for different constant values of P. Maximum $T_{c}$ that can be achieved under pressure was estimated and discussed in relation to the $n_{h0} = 1//8$ doping and establishment of charge and spin order. The results obtained here were used to estimate increase of the hole concentration in the $CuO_2$ planes which occurs as a result of pressure induced oxygen reordering.
Źródło:
Acta Physica Polonica A; 2013, 124, 4; 745-749
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovery of copper from smelting slag by sulphation roasting and water leaching
Autorzy:
Dimitrijevic, M. D.
Urosevic, D. M.
Jankovic, Z. D.
Milic, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/110627.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
copper
slag
sulphation
roasting
acid baking
leaching
Opis:
In this work extraction of copper and iron from a reverberatory furnace slag was studied. A two-step extraction procedure was followed. The first step was roasting of the slag in the presence of sulphuric acid at temperatures between 150 and 800oC. The second step was leaching of the resulting calcine with distilled water. The maximum copper extraction of about 94% was achieved. In this case, the slag was roasted at 250oC with sulphuric acid higher of about 33% than that stoichiometrically required, followed by water leaching of calcine at 50oC. About 55% of iron was also dissolved under these conditions. On the other hand, for the calcine obtained at sulphation temperature of 600oC, extraction of copper in a water leaching stage was still relatively high (about 79%), whereas that of iron was comparatively low (about 6%). Dissolution of copper and iron from the calcine was found to be very fast and was complete within the first few minutes. The water temperature in the leaching step was found to have no effect on extraction of copper and iron from the calcine in the range of 30 to 85oC.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 409-421
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of zero and non-zero boresight pointing errors on bit-error rate free-space optic transmission over Málaga atmospheric channel
Autorzy:
Smilić, M.
Perić, Z.
Milić, D.
Marković, A.
Savić, M.
Powiązania:
https://bibliotekanauki.pl/articles/173446.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
free-space optic system
FSO
Málaga atmospheric turbulence channel
zero boresight pointing error
non-zero boresight pointing error
average bit-error-rate
ABER
Opis:
In this paper, the influence of a zero and a non-zero boresight pointing errors on the performances of free-space optic transmission over the Málaga atmospheric turbulence channel is considered. Closed form expressions for a zero boresight channel model probability density function, non-zero boresight channel model probability density function, as well as a bit-error rate over a binary phase shift keying modulation transmission are provided. Numerical results for zero and non-zero boresight pointing errors are graphically presented.
Źródło:
Optica Applicata; 2018, 48, 2; 179-189
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of naphthenic acids (NAs) on the response of ‘Golden Delicious’ and ‘Fuji’ apple trees on chemical thinning with NAA
Wpływ kwasu naftenowego (NAS) na reakcję jabłoni ‘Golden Delicious’ i ‘Fuji’ na chemiczne przerzedzanie za pomocą NAA
Autorzy:
Keserović, Z.
Milić, B.
Kevrešan, S.
Magazin, N.
Dorić, M.
Powiązania:
https://bibliotekanauki.pl/articles/11543401.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
NAA (α-naphthylacetic acid) thins apple fruits inconsistently regarding fruit set and weight and may cause small or misshapen fruits occurrence. Considering hormonal activity, surfactant properties and the impact of naphthenic acids (NAs) on the metabolism of auxins in plant tissue, it is assumed that thinning response and fruit size could be improved by adding NAs to NAA for chemical thinning of apple. The purpose of the research was to evaluate thinning efficacy of the mixture of NAA and NAs in two commercially grown apple cultivars, ‘Golden Delicious’ and ‘Fuji’, known to respond differently to the application of NAA. The following treatments were applied during a three-year period, from 2010 to 2012: 10 mg∙L-1 NAA, 10 mg∙L-1 NAA + 1.56 mg∙L-1 NAs, 20 mg∙L-1 NAA, 20 mg∙L-1 NAA + 3.12 mg∙L-1 NAs and an untreated control. The addition of NAs to NAA did not alter the effectiveness of NAA in reducing fruit set, while it significantly increased fruit weight compared to NAA applied alone in two of three years of the experiment. NAs modulated the effect of NAA on fruit weight of apple cultivar ‘Fuji’ by retarding fruit growth and causing a higher number of small fruits to occur compared to NAA applied alone.
NAA (kwas naftylooctowy) nierównomiernie przerzedza owoce jabłoni jeśli chodzi o zawiązki i masę oraz może spowodować małe i źle uformowane owoce. Odnosząc się do działania hormonalnego, właściwości substancji powierzchniowo czynnych oraz wpływu kwasu naftenowego (Nas) na metabolizm auksyn w tkance roślinnej, to zakłada się, że reakcję na przerzedzanie oraz rozmiar można polepszyć poprzez dodanie NAs do NAA do chemicznego przerzedzania jabłek. Celem badania była ocena skuteczności przerzedzania mieszaniny NAA i NAs u dwóch komercyjnie hodowanych odmian jabłoni: ‘Golden Delicious’ oraz ‘Fuji’, o których wiadomo, że reagują różnie na zastosowanie NAA. Zastosowano następujące zabiegi podczas 3-letniego okresu badań (2010– 2012): 10 mg∙L-1 NAA, 10 mg∙L-1 NAA + 1,56 mg∙L-1 NAs, 20 mg∙L-1 NAA, 20 mg∙L-1 NAA + 3,12 mg∙L-1 NAs oraz kontrola bez zabiegów. Dodatek NAs do NAA nie zmienił skuteczności NAA w zmniejszaniu zawiązków, natomiast istotnie zwiększył masę owoców w porównaniu z zastosowaniem samego NAA w dwóch z trzech lat doświadczenia. NAs regulował wpływ NAA na masę owoców odmiany ‘Fuji’ poprzez opóźnianie wzrostu owoców i podwyższenie liczby małych owoców w porównaniu z zastosowaniem samego NAA.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2016, 15, 3; 113-125
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Postharvest quality of sweet cherry fruits as affected by bioregulators
Autorzy:
Kalajdžić, J.
Milić, B.
Petreš, M.
Stankov, A.
Grahovac, M.
Magazin, N.
Keserović, Z.
Powiązania:
https://bibliotekanauki.pl/articles/12305251.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
plant cultivation
sweet cherry
Prunus avium
Regina cultivar
Summit cultivar
Kordia cultivar
fruit tree
fruit quality
postharvest quality
bioregulator
gibberellic acid
shelf life
weight loss
fruit storage
fruit decay
fruit rot
rot infestation
Opis:
During the cold storage of sweet cherry, severe losses can occur due to the water loss, phytopathogenic fungi and physiological disorders. The aim of this research was to assess the effects of treatments with NAA (α-naphthaleneacetic acid), BA (6-benzyladenine), and GA3 (gibberellic acid) on fruit quality at harvest and after 21 days of storage under two regimes, including 0°C, RH (relative humidity) 90% and 3°C, RH 70%, and after additional shelf life exposure. Sweet cherry cultivars – ‘Summit’, ‘Kordia’ and ‘Regina’ – were treated with bioregulators at the end of flowering. NAA significantly increased the fruit weight at harvest compared to the control in all cultivars assessed. BA stimulated the fruit growth in ‘Kordia’ and ‘Regina’, while it was ineffective in ‘Summit’. GA3 caused significant increase in fruit weight by 8.3% in ‘Kordia’ only. Moreover, BA and GA3 induced a higher firmness of fruits at harvest. Weight loss of fruits during storage at 0°C, RH 90%, was increased with NAA and reduced with GA3 in ‘Regina’ only. BA and GA3 reduced the weight loss of sweet cherry fruits stored at 3°C, RH 70%. Bioregulator treatments increased TA (titratable acidity) in fruits at harvest, while the effects on TA during storage were variable depending on the cultivar. ‘Summit’ had the highest sensitivity to storage fruit rot. BA and GA3 decreased the disease occurrence on fruits stored at 0°C in ‘Summit’ and ‘Kordia’.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 5; 189-199
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical performance analysis of the M2M wireless link with an antenna selection system over interference limited dissimilar composite fading environments
Autorzy:
Ðošić, Danijel
Milić, Dejan
Kontrec, Nataša
Stefanović, Časlav
Milosavljević, Srðan
Stefanović, Dušan M.
Powiązania:
https://bibliotekanauki.pl/articles/2172127.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
mobile to mobile communication
vehicle to vehicle communication
Nakagami-m fading
Rice fading
probability density function
cumulative density function
urządzenia mobilne
komunikacja między pojazdami
funkcja gęstości prawdopodobieństwa
Opis:
This paper considers direct mobile-to-mobile (M2M) communications with a dual antenna selection (AS) system at a destination mobile node (DMN) in interference limited, dissimilar composite fading environments. In particular, we model dissimilar interference limited signals at the inputs of the dual branch AS system as (i) the ratio of two Nakagami-m (N) random variables (RVs) at the first branch and (ii) the ratio of two Rice RVs at the second branch, in order to account for non line-of-sight (NLOS) and line-of-sight (LOS) communications, respectively. Moreover, we assume variable powers of the desired as well as interference signals at the output of the DMN in order to account for the impact of shadowing. For the proposed model, we derive probability density functions, cumulative distribution functions, outage probabilities and average level crossing rates. The derived statistical results are evaluated for all the statistical measures considered and are graphically presented in order to provide insight into the impact of composite fading severities and LOS factors for the desired signal, as well as for the interference, on the system performances.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2022, 32, 4; 569--582
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Early performance of four sweet cherry cultivars grafted on Gisela 5 and Colt rootstocks in a high density growing system
Autorzy:
Milić, B.
Kalajdžić, J.
Keserović, Z.
Magazin, N.
Ognjanov, V.
Miodragović, M.
Popara, G.
Powiązania:
https://bibliotekanauki.pl/articles/12617664.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
plant cultivation
fruit
sweet cherry
Gisela 5 cultivar
Colt rootstock
growing system
high density
plant performance
Opis:
Growing the sweet cherry on different vigor rootstocks, such as Colt and Gisela 5, in a high-density orchard, causes differences in growth and productivity and later imposes the need to change the growing system including pruning, flower and fruit thinning, irrigation and fertilization. In the present research, four sweet cherry cultivars (Summit, Kordia, Lapins and Regina) grafted on Colt and Gisela 5 rootstocks were assessed for morphological traits and productivity. The parameters investigated were: vegetative growth, bearing potential, fruit set, precocity, productivity, fruit growth habit and quality attributes. Compared to Colt, the trees on Gisela 5 had smaller TCSA and the length of two-year-old branches, in the fifth season after planting. Trees on Gisela 5 had a higher number of flower buds per may bouquet compared to Colt, which confirms that bearing potential is highly affected by the rootstock. Growing the sweet cherries on Gisela 5 induced a higher fruit setting in all cultivars except in Kordia. Fruit physical attributes were affected by the cultivar, growing system and experimental year. For all tested cultivars, the yield per tree was significantly lower on Colt compared to Gisela 5. Gisela 5 performed better than Colt, which suggests that Gisela 5 should be used as a rootstock in high density sweet cherry production systems.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 1; 99-108
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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