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Wyszukujesz frazę "Savic, M." wg kryterium: Autor


Wyświetlanie 1-12 z 12
Tytuł:
Microwave field strength computing for the resonator designs and filters
Autorzy:
Radmilović-Radjenović, M.
Radjenović, B.
Savić, M.
Powiązania:
https://bibliotekanauki.pl/articles/1070622.pdf
Data publikacji:
2016-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.80.-s
52.90.+z
Opis:
Recent development of microwave pulse generators, which are now capable of delivering very short and very intensive pulses requires properly generalized classical breakdown theory. On the other hand, the trend to design microwave devices as small and compact as possible, leads to a concern about the concomitant breakdown strength of the construction, involving more complicated geometries, such as in microwave resonators and filters. In this paper, several aspects of microwave breakdown field strength in commercially available resonator designs and filters are presented and analyzed. The numerical predictions based on the Slater theorem are compared with the analytical results and predictions of the fluid approach, demonstrating very good agreement.
Źródło:
Acta Physica Polonica A; 2016, 129, 3; 289-292
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Breakdown Phenomena in Water Vapor Microdischarges
Autorzy:
Radmilović-Radjenović, M.
Radjenović, B.
Savić, M.
Powiązania:
https://bibliotekanauki.pl/articles/1537848.pdf
Data publikacji:
2010-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.50.Qt
52.65.Rr
52.80.Pi
Opis:
The gas breakdown at the large gap sizes is reasonably well understood. However, the breakdown phenomenon in microgaps is still not sufficiently explored. The high electric fields realized in small gaps combined with the lowering of the potential barrier, seen by the electrons in the cathode as ion approaches lead to ion-enhanced field emission leading to deviations from the standard Paschen law. In this paper, semi-empirical expressions for the breakdown voltage based on the fitting of numerical solutions of the DC breakdown criteria in microdsicharges have been derived. In the standard breakdown criteria the secondary emission coefficient that incorporates the enhancement of the secondary electron emission has been included. The obtained expressions can be used for determination the pressure and the gap dependence of the breakdown field strength in the water vapor, separately.
Źródło:
Acta Physica Polonica A; 2010, 117, 5; 752-755
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
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:
Dependence of Structural Characteristics of Polyamide Textured Yarns on the Parameters of the False Twist Yarn Texturing Process
Zależność charakterystyk strukturalnych przędzy poliamidowej od parametrów procesu teksturowania
Autorzy:
Trajković, D.
Savic, M.
Kostic, M.
Majstorovic, D.
Stojanovic, P.
Stepanovic, J.
Powiązania:
https://bibliotekanauki.pl/articles/231618.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
false twist
structural characteristics
textured yarns
skręt nieprawidłowy
struktura przędzy poliamidowej
proces teksturowania
Opis:
In the false twist texturing process, due to the action of mechanical forces and heat, a disorientation of structural elements happens at all levels of the supramolecular structure. These changes are related to changes in the texturing parameters and mechanical properties of yarn. In this paper, investigated is the effect of technical-technological texturing parameters in the false twist texturing process on the structure of PA6.6 yarns. POY multifilament PA6.6 with a fineness of 22f07x1 dtex was used as experimental material. The yarn was textured on a friction texturing machine - ICBT model FT 15 E3. The exiting yarn speed (Vi) changed as 600, 700, 800 and 900 m/min; the heater temperature (T) was 200, 210 and 220 °C, and the ratio of the disk surface speed to the linear yarn speed (D/Y) was 1.9 and 2.1. The values of strain were kept constant at 1.305 (tension in texturing zone) and 0,954 in the winding zone. Analysed were the density, degree of crystallinity, degree of orientation, single filament diameter, the content of -NH2 and -COOH end groups, and the total content of end groups. From the results obtained it can be seen that the effect of the heater temperature is more significant than that of Vi and D/Y on the structural characteristics analysed. Analysing the experimental results it was found that linear positive correlations were established between the texturing speed and end (-NH2) groups, the texturing speed and end (-COOH) groups and the texturing speed and the total content of end groups. The correlation factor between the process parameters and yarn structural characteristics analysed is determined.
W procesie teksturowania, w wyniku działania sił mechanicznych i wysokich temperatur, ma miejsce dezorientacja elementów strukturalnych. W pracy zbadano wpływ parametrów technicznych i technologicznych procesu teksturowania na strukturę przędzy poliamidowej. Jako materiał doświadczalny zastosowano multifilamentowy PA6.6 POY. Zastosowano trzy prędkości wyjściowe przędzy: 600, 700, 800 i 900 m/min, a temperatura ogrzewania wynosiła 200, 210 i 220 °C. Analizowano gęstość, stopień krystaliczności, stopień orientacji, średnicę poszczególnych filamentów, zawartość grup końcowych -NH2 i -COOH oraz całkowitą zawartość grup końcowych. Na podstawie uzyskanych wyników stwierdzono, że na analizowane właściwości strukturalne ma większy wpływ temperatura, niż prędkości wyjściowych przędzy. Po analizie wyników badań określono współczynnik korelacji między parametrami procesu a analizowanymi cechami strukturalnymi przędzy.
Źródło:
Fibres & Textiles in Eastern Europe; 2017, 3 (123); 79-85
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical modeling of copper losses in the silicate slag of the sulfide concentrate smelting process
Autorzy:
Savic, M. V.
Djordjevic, P. B.
Mihajlovic, I. N.
Zivkovic, Z. D.
Powiązania:
https://bibliotekanauki.pl/articles/778781.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
modeling
copper concentrate
smelting process
copper losses
slag
ANFIS
Opis:
This article presents the results of the statistical modeling of copper losses in the silicate slag of the sulfide concentrates smelting process. The aim of this study was to define the correlation dependence of the degree of copper losses in the silicate slag on the following parameters of technological processes: SiO2, FeO, Fe3O4, CaO and Al2O3 content in the slag and copper content in the matte. Multiple linear regression analysis (MLRA), artificial neural networks (ANNs) and adaptive network based fuzzy inference system (ANFIS) were used as tools for mathematical analysis of the indicated problem. The best correlation coefficient (R2 = 0.719) of the final model was obtained using the ANFIS modeling approach.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 3; 62-69
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of multivariate analysis of the radon variability in the underground laboratory and indoor environment
Autorzy:
Filipović, J.
Maletić, D.
Udovičić, V.
Banjanac, R.
Joković, D.
Savić, M.
Veselinović, N.
Powiązania:
https://bibliotekanauki.pl/articles/147023.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
multivariate analysis
radon variability
Opis:
The paper presents results of multivariate analysis of variations of radon concentrations in the shallow underground laboratory and a family house, depending on meteorological variables only. All available multivariate classifi cation and regression methods, developed for data analysis in high-energy physics and implemented in the toolkit for multivariate analysis (TMVA) software package in ROOT, are used in the analysis. The result of multivariate regression analysis is a mapped functional behaviour of variations of radon concentration depending on meteorological variables only, which can be used for the evaluation of radon concentration, as well as to help with modelling of variation of radon concentration. The results of analysis of the radon concentration variations in the underground laboratory and real indoor environment, using multivariate methods, demonstrated the potential usefulness of these methods. Multivariate analysis showed that there is a potentially considerable prediction power of variations of indoor radon concentrations based on the knowledge of meteorological variables only. In addition, the online system using the resulting mapped functional behaviour for underground laboratory in the Institute of Physics Belgrade is implemented, and the resulting evaluation of radon concentrations are presented in this paper.
Źródło:
Nukleonika; 2016, 61, 3; 357-360
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A framework for additional server activation
Autorzy:
Savić, G.
Makajić-Nikolić, D.
Vujošević, M.
Powiązania:
https://bibliotekanauki.pl/articles/409328.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
queue
Additional server
Activation rule
Petri nets
data envelopment analysis
Opis:
This paper assesses the performance of the queuing system with several fixed and additional multitask servers. The additional server serves customers in the case of necessity to avoid congestion and decrease the number of impatient customers. An additional server will be activated whenever the length of queue becomes greater than or equal to user defined size i.e. threshold value. Also, this server will be switched off when the length of queue falls below user defined size, but ongoing service has to be finished.The main issue is to decide when and how long the additional server would work with customers. This paper proposes a methodology to choose the best activation rule for the work of an additional server, based on the performance evaluation of queuing system. The Petri nets (PN) simulation is used to calculate the performance measures. Relative efficiency evaluation of different activation rules is carried out by data envelopment analysis (DEA). The methodology is applied on real-life data collected from a postal office.
Źródło:
Research in Logistics & Production; 2012, 2, 4; 387-397
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Beet Root Extract Fluorescence Using TR-LIF Technique
Autorzy:
Rabasovic, M.
Sevic, D.
Terzic, M.
Savic-Sevic, S.
Muric, B.
Pantelic, D.
Marinkovic, B.
Powiązania:
https://bibliotekanauki.pl/articles/1791241.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.62.Be
32.50.+d
33.50.Dq
Opis:
Laser induced fluorescence is a powerful spectroscopic technique commonly used to study the structure and internal state distributions in molecules of biological interest. Betanin $(C_{24}H_{26}N_{2}O_{13})$ is a specific violet betacyanin and the most prominent pigment in the red beet root where it contributes to 75-95% of the total visible color. Our method of excitation of the beet root extract is based on the tunable (320 nm to 475 nm) Nd:YAG laser system. Fluorescence images of beet root extract excited at 320, 340, 360 and 400 nm were obtained. The fluorescence is observed in range from 580 nm to 660 nm. The influence of the solution concentrations on the fluorescence intensity is also analyzed.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 570-572
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Macro- and micro-element composition of Osage orange Maclura pomifera L. (Moraceae)
Autorzy:
Stojiljkovic, M.S.
Petrovic, S.M.
Stojilkovic, S.T.
Savic, S.R.
Todorovic, B.Z.
Powiązania:
https://bibliotekanauki.pl/articles/14905.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Źródło:
Journal of Elementology; 2018, 23, 4
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The choice of high gradient magnetic separation processes for removal of Fe2O3 carriers from quartz raw material
Wybór procesów separacji magnetycznej wysokogradientowej do usuwania nośników Fe2O3 z surowca kwarcowego
Autorzy:
Sekulic, Z.
Bartulovic, Z.
Mihajlovic, S.
Ignjatovic, M.
Savic, L.
Jovanovic, V.
Nisic, D.
Powiązania:
https://bibliotekanauki.pl/articles/216606.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
quartz raw material
mineral impurities
preparation process
high gradient separation
magnetic separation
surowiec kwarcowy
zanieczyszczenia surowca
proces wzbogacania
separacja wysokogradientowa
separacja magnetyczna
Opis:
This review article surveys the subject of choice of high gradient magnetic separation processes for removal of Fe2O3 carriers from quartz raw material by electromagnetic separator with magnetic field intensity of 1.4 T. The review is based on current experience of authors during research phase, as well as project development phase and initial operation of facilities in several locations. Quartz mineral raw material in those locations appeared as sandstone or as loose material. In addition to that, quartz raw material from those locations contained various impurities, i.e. Fe2O3 carriers. The choice of this process for Fe2O3 removal depended on mineralogical composition, shape and the content of minerals, and Fe2O3 removal rate after this process was from 29 to 65%. Magnetic separation is magnetic induction of 1.4 T. It is applied on commercial assortments which were previously subjected to washing and classification processes. It is always the assortment which has to have the lowest Fe2O3 content. The choice of „dry“ or „wet“ magnetic separation (with water flush) also depends on the fact whether this desired assortment is intended for market as dry or wet, as well as on the composition of magnetic impurities. In most cases, the process applied is the wet one.
W artykule dokonano przeglądu badań nad zastosowaniem procesów separacji magnetycznej wysokogradientowej w celu usunięcia nośników Fe2O3 z surowca kwarcowego z a pomocą separatora elektromagnetycznego o natężeniu pola magnetycznego wynoszącego 1,4 T. Przegląd opiera się na aktualnym doświadczeniu autorów podczas fazy badań, a także fazy planowania projektu i początkowej eksploatacji obiektów w kilku miejscach. Kwarcowy surowiec mineralny w tych miejscach występował jako piaskowiec lub luzem. Poza tym surowiec kwarcowy z tych miejsc zawierał różne zanieczyszczenia, np. nośniki Fe2O3. Wybór tego procesu w celu usunięcia Fe2O3 zależał od składu mineralogicznego, kształtu i zawartości minerałów, a stopień usuwania Fe2O3 w tym procesie wynosił od 29 do 65%. Separacja magnetyczna jest indukcją magnetyczną o natężeniu pola 1,4 T. Stosuje się ją do handlowych asortymentów, które były wcześniej poddawane procesom przemywania i klasyfikacji. Zawsze jest to asortyment, który musi mieć najniższą zawartość Fe2O3. Wybór „suchej” lub „mokrej” separacji magnetycznej (z płukaniem wodą) zależy również od tego, czy pożądany asortyment jest przeznaczony do sprzedaży na sucho czy na mokro, a także od składu zanieczyszczeń magnetycznych. W większości przypadków stosowany jest proces mokry.
Źródło:
Gospodarka Surowcami Mineralnymi; 2017, 33, 4; 93-106
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prevalence of Bovine herpesvirus type 4 in aborting dairy cows
Autorzy:
Cvetojevic, D.
Savic, B.
Milicevic, V.
Kureljusic, B.
Jezdimirovic, N.
Jakic-Dimic, D.
Pavlovic, M.
Spalevic, Lj.
Powiązania:
https://bibliotekanauki.pl/articles/32010.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Bovine herpesvirus type 4 (BHV-4) is related to many different conditions: infertility, postpartal metritis, vulvovaginitis, mastitis, encephalitis, calf pneumonia, keratoconjunctivitis, cutaneous lesions, digital dermatitis and abortion. In this study a retrospective PCR examination of 100 extracted DNA samples from aborting cows was performed in order to determine: prevalence of BHV-4 in abortive cattle, whether coinfections BHV-4 with other abortifacient pathogens are present in the same sample and to determine the month of gestation when BHV-4 associated abortions were detected. Out of 100 examined samples, the BHV-4 genome was detected in 21 samples (21%). In two samples we detected coinfection of BHV-4 with bovine viral diarrhea virus (BVDV) and in one with Neospora caninum. Most of the BHV-4-associated abortions were detected during the seventh month of gestation. It was concluded that an active BHV-4 infection was present among cows that aborted on the farms examined. The high prevalence of the BHV-4 genome in abortion material suggests that this virus may have cause the abortions. Further studies and examinations are needed to establish causative connection between presence of BHV-4 and abortion.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
TYROSINASE INHIBITORY AND ANTIOXIDANT ACTIVITY OF WILD ROSA CANINA L. AND SORBUS AUCUPARIA L. FRUIT EXTRACTS
Autorzy:
Stanković, Milica I.
Savić, Vesna L.
Živković, Jelena V.
Stanojević, Ljiljana P.
Tadić, Vanja M.
Arsić, Ivana A.
Powiązania:
https://bibliotekanauki.pl/articles/895312.pdf
Data publikacji:
2019-06-28
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
antioxidants
polyphenols
Rosa canina L
Sorbus aucuparia L
anti-tyrosinase
Opis:
In the present work, fruits from two plant species, Rosa canina L. and Sorbus aucuparia L., popular in traditional folk medicine in Serbia, were studied. The aim was to examine and compare the efficiency of the ultrasonic extraction with different solvents regarding physicochemical properties, polyphenolic profile of extracts, as well as their tyrosinase inhibitory and antioxidant activity. The polyphenols evaluation indicated that water was the best solvent for a thorough extraction of bioactive compounds from the R. canina fruits, while propylene glycol-water (45:55, v/v) was the most efficient regarding S. aucuparia fruits, followed by ethanol-water (7:3, v/v). Only flavonoids were more abundant in S. aucuparia fruit extracts. R. canina water extracts showed a higher antioxidant activity, using several in vitro tests with different working principles. However, S. aucuparia ultrasonic extracts with propylene glycol-water (45:55, v/v) demonstrated a higher potential concerning tyrosinase inhibitory and chelating activity. Therefore, these ultrasonic extracts, being great sources of natural anti-tyrosinase inhibitors and antioxidants, can be considered as promising candidates suitable for pharmaceutical application, as great sources of natural anti-tyrosinase inhibitors and antioxidants.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 3; 523-533
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-12 z 12

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