oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2017 ( 1 )

2016 ( 1 )

2015 ( 26 )

2014 ( 30 )

Custom range...

Search Results: 1 - 10 of 447 matches for " Stanislaw Zola "
All listed articles are free for downloading (OA Articles)
Page 1 /447
Display every page Item
SV Cen reveals its mystery
Michal Siwak,Stanislaw Zola,Slavek Rucinski
Physics , 2009,
Abstract: Our very-first high resolution spectra of SV Cen close binary system obtained in the H alpha line reveal its absorption and emmision components, changing with orbital phase. An accretion disk surrounding the component eclipsed at the primary minimum is the most plausible explanation of this complex structure.
Determination of characteristics of newly discovered eclipsing binary 2MASS J18024395 +4003309 = VSX J180243.9+400331
Ivan L. Andronov,Vitalii V. Breus,Stanislaw Zola
Physics , 2012,
Abstract: During processing the observations of the intermediate polar 1RXS J180340.0+401214, obtained 26.05.2012 at the 60-cm telescope of the Mt. Suhora observatory (Krakow, Poland), variability of 2MASS J18024395+4003309 was discovered. As this object was not listed in the "General Catalogue of Variable Stars" or "Variable Stars Index", we registered it as VSX J180243.9+400331. Additionally we used 189 separate observations from the Catalina Sky Survey spread over 7 years. The periodogram analysis yields the period of 0d.3348837{\pm}0d.0000002.The object was classified as the Algol-type eclipsing binary with a strong effect of ellipticity. The depths of the primary and secondary minima are nearly identical, which corresponds to a brightness (and maybe) mass ratio close to 1. The statistically optimal degree of the trigonometric polynomial n=4. The most recent minimum occurred at HJD 2456074.4904. The brightness range from our data is 16.56-17.52 (V), 16.18-17.08 (R). The NAV ("New Algol Variable") algorithm was applied for statistically optimal phenomenological modeling and determination of corresponding parameters.
A study of contact binaries with large temperature differencies between components
Michal Siwak,Stanislaw Zola,Dorota Koziel-Wierzbowska
Physics , 2010,
Abstract: We present an extensive analysis of new light and radial-velocity (RV) curves, as well as high-quality broadening-function (BF) profiles of twelve binary systems for which a contact configuration with large temperature differencies between components has been reported in the literature. We find that six systems (V1010 Oph, WZ Cyg, VV Cet, DO Cas, FS Lup, V747 Cen) have near-contact configurations. For the remaining systems (CX Vir, FT Lup, BV Eri, FO Hya, CN And, BX And), our solutions of the new observations once again converge in a contact configuration with large temperature differencies between the components. However, the bright regions discovered in the BFs for V747 Cen, CX Vir, FT Lup, BV Eri, FO Hya, and CN And, and further attributed to hot spots, shed new light on the physical processes taking place between the components and imply the possibility that the contact configurations obtained from light- and RV-curve modelling are a spurious result.
A photometric and spectroscopic study of WW And - an Algol-type, long period binary system with an accretion disc
Michal Siwak,Stanislaw Zola,Tomasz Szymanski,Maria Kurpinska-Winiarska,Maciej Winiarski,Dorota Koziel-Wierzbowska,Waclaw Waniak,Michal Drahus
Physics , 2012, DOI: 10.1016/j.newast.2012.02.006
Abstract: We have analyzed the available spectra of WW And and for the first time obtained a reasonably well defined radial velocity curve of the primary star. Combined with the available radial velocity curve of the secondary component, these data led to the first determination of the spectroscopic mass ratio of the system at q-spec = 0.16 +/- 0.03. We also determined the radius of the accretion disc from analysis of the double-peaked H-alpha emission lines. Our new, high-precision, Johnson VRI and the previously available Stromgren vby light curves were modelled with stellar and accretion disc models. A consistent model for WW And - a semidetached system harbouring an accretion disc which is optically thick in its inner region, but optically thin in the outer parts - agrees well with both spectroscopic and photometric data.
Coupling of the Magnetostriction and Hall Effect in the Porous Magnetorheological Composite  [PDF]
Stanislaw BEDNAREK
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.21001
Abstract: The first part of this paper is presents a method for producing the composite which shows ferromagnetic, highly-elastic and electrically-conducting properties. This composite consists of ferromagnetic particles of the size 0.15-0.25 mm made of the chemically pure iron. The mentioned particles were dispersed in the elastic porous silicone the matrix with pores of the size 0.15-0.25 mm. Colloidal graphite particles of the size not exceeding 0.5 µm were added to the matrix to increase electrical conductivity. The production method consist in mixing particles of iron, graphite and sodium chloride with non-polymerized silicone and rinsing salt particles by water after the matrix polymerization. In its second part the paper provides a description of the measurement system for longitudinal magnetostriction and the Hall voltage. The magnetic field with the induction of ± 8 T produced by the Bitter type magnet was applied to the composite samples. The supplying voltage was applied to these samples and the Hall voltage was measured at the electrodes glued to them. The longitudinal magnetostriction was measured by means of the capacitor with a variable capacity placed at the upper surface of these samples. The linear magnetostriction exceeding ± 6 % and the Hall voltage reaching ± 5.5 nV were detected by the conducted measurements. Both the longitudinal magnetostriction and the Hall voltage show nonlinear changes and hysteresis lopes during the magnetic field application and the supplying current flow. The coupling of these changes and other regularities observed in the investigated composites and especially their non-linearity and hysteresis, are discussed in the final part of the paper.
Electrodynamics of the Electron Orbital Motion in the Hydrogen Atom Considered in Reference to the Microstructure of the Electron Particle and Its Spin  [PDF]
Stanislaw Olszewski
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.615224
Abstract: Electrodynamics of the one-electron currents due to the circular orbital motion of the electron particle in the hydrogen atom has been examined. The motion is assumed to be induced by the time change of the magnetic field in the atom. A characteristic point is that the electric resistance calculated for the motion is independent of the orbit index and its size is similar to that obtained earlier experimentally for the planar free-electron-like structures considered in the integer quantum Hall effect. Other current parameters like conductivity and the relaxation time behave in a way similar to that being typical for metals. A special attention was attached to the relations between the current intensity and magnetic field. A correct reproduction of this field with the aid of the Biot-Savart law became possible when the geometrical microstructure of the electron particle has been explicitly taken into account. But the same microstructure properties do influence also the current velocity. In fact the current suitable for the Biot-Savart law should have a speed characteristic for a spinning electron particle and not that of a spinless electron circulating along the orbit of the original Bohr model.
Ritual Continuity and “Failed Rituals” in a Winter Masquerade in the Italian Alps
Lia Zola
Revue de Géographie Alpine , 2011, DOI: 10.4000/rga.1443
Abstract: Alpine winter masquerades, also known as carnival masquerades, may be regarded as one of the most complex phenomena within the field of study of cultural anthropology and folklore. In the Italian alpine chain some of them have been brought to a new life two decades ago after a long period of decline; since then, alpine winter masquerades have been the focus of a great interest by cultural anthropologists, theatre performers and other intellectuals. In some cases bringing a winter masquerade to new life has proved to be successful; in others, after a first, “reborn” performance, some celebrations abruptly stopped. My paper aims to explore issues of ritual continuity and ritual failure through a specific case-study, that of the carnival masquerade in Salbertrand, an alpine settlement of 485 inhabitants in the upper part of the Val di Susa, in the Italian western alpine chain. Les mascarades alpines d'hiver, aussi connues comme mascarades de carnaval, peuvent être considérées comme l’un des phénomènes les plus complexes dans le champ d'étude d'anthropologie culturelle et du folklore. Dans la cha ne alpine italienne, certains d'entre eux ont été amenés à une nouvelle vie il y a deux décennies, après une longue période de déclin. Dès lors, les mascarades alpines d'hiver ont été sujet d'intérêt majeur pour les anthropologues culturels, les acteurs de théatre et d'autres intellectuels. Dans certains cas, réactiver une mascarade d'hiver s'est soldé par une réussite ; dans d'autres, après une première manifestation "renaissante" quelques célébrations se sont brusquement arrêtées. Mon article aspire à explorer les phénomènes de continuité et d'échec rituel à travres une étude de cas spécifique, celui de la mascarade de carnaval de Salbertrand, une localité alpine de 485 habitants dans la partie supérieure de Val De Suse, dans les Alpes occidentales italiennes.
Continuité des rituels et “Rituels manqués” lors d'une Mascarade d'hiver dans les Alpes italiennes
Lia Zola
Revue de Géographie Alpine , 2011, DOI: 10.4000/rga.1453
Abstract: Les mascarades alpines d'hiver, aussi connues comme mascarades de carnaval, peuvent être considérées comme l’un des phénomènes les plus complexes dans le champ d'étude d'anthropologie culturelle et du folklore. Dans la cha ne alpine italienne, certains d'entre eux ont été amenés à une nouvelle vie il y a deux décennies, après une longue période de déclin. Dès lors, les mascarades alpines d'hiver ont été sujet d'intérêt majeur pour les anthropologues culturels, les acteurs de théatre et d'autres intellectuels. Dans certains cas, réactiver une mascarade d'hiver s'est soldé par une réussite ; dans d'autres, après une première manifestation "renaissante" quelques célébrations se sont brusquement arrêtées. Mon article aspire à explorer les phénomènes de continuité et d'échec rituel à travres une étude de cas spécifique, celui de la mascarade de carnaval de Salbertrand, une localité alpine de 485 habitants dans la partie supérieure de Val De Suse, dans les Alpes occidentales italiennes. Alpine winter masquerades, also known as carnival masquerades, may be regarded as one of the most complex phenomena within the field of study of cultural anthropology and folklore. In the Italian alpine chain some of them have been brought to a new life two decades ago after a long period of decline; since then, alpine winter masquerades have been the focus of a great interest by cultural anthropologists, theatre performers and other intellectuals. In some cases bringing a winter masquerade to new life has proved to be successful; in others, after a first, “reborn” performance, some celebrations abruptly stopped. My paper aims to explore issues of ritual continuity and ritual failure through a specific case-study, that of the carnival masquerade in Salbertrand, an alpine settlement of 485 inhabitants in the upper part of the Val di Susa, in the Italian western alpine chain.
The Role of Islamic Fundamentalism in Algeria
Zola Sonkosi
Scientia Militaria : South African Journal of Military Studies , 2012, DOI: 10.5787/28-2-211
Abstract: Algeria and the Islamist challenge For six years, Algeria has been experiencing a true nightmare of terror. Human rights organisations estimate that since 1992, 120 000 people were killed) by armed Islamic groups or state security, among them many civilians. During Ramadan 1998, there were shocking news of cruelly executed and mutilated women, men and children in Koraa, 80 kilometres south-west of the capital Algiers. The alleged culprits were assumed to belong to the Groupe lslamique Armée (GIA). The critical Algerian press increasingly becomes a victim of fanaticism and state censorship4. In order to understand these events better, it is necessary to take a look at the history of this country. In 1962, Algeria celebrated its independence from 132 years of colonial occupation by France. This great event was preceded by a long and bitter war, which was led by the Front De Libération Nationale (FLN), and its ally, the Armée de Libération Nationale (ALN). In 1954, Algerians began to fight the French army that was considered unbeatable. Its defeat was achieved in 1962, but the country was never exposed to democracy and pluralism because the FLN-leadership preferred to practice one-party-rule after the Soviet model. Critics, especially from the ranks of former freedom fighters, among them Mohamed Boudiaf and Hocine Ait Ahmeds, were arrested or forced to go into exile.
Why Do the Main Sequence Stars Have Similar Chemical Composition?  [PDF]
Stanislaw Halas, Tomasz Durakiewicz
International Journal of Astronomy and Astrophysics (IJAA) , 2012, DOI: 10.4236/ijaa.2012.21006
Abstract: In this short note we have reconsidered the Jeans criterion for gravitational contraction of a gas nebula at different temperatures, from the present-day background radiation temperature (2.8 K) to those which existed at the early stage of the Universe. We demonstrate that the initial mass of quasars cannot be of the order of single galaxy masses, but rather 106 solar mass only. If they have larger masses, it must be the result of subsequent accretion process. Nevertheless quasars, formed prior to the stars, were the immediate source of the elements heavier than helium.
Page 1 /447
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.