LEI 11079 ATUALIZADA PDF

June 16, 2020   |   by admin

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UMA network could be easily integrated into the existing cellular networks without influencing mobile core network, and could provides high-quality mobile services with preferentially priced indoor voice and data usage. This helps to improve subscriber’s experience. This offers the traditional mobile pei an opportunity to integrate WiMax technique into cellular network. In the end of this article, we also give an analysis of potential influence on the cellular core networks ,which is pulled by Stualizada network.

Orbital period variations of two W UMa -type binaries: Due to their contact configurations, the secular period increases are interpreted as a result of mass transfer from the less massive component to the more massive one. The cyclic period variation of UY UMa may be interpreted in terms of either the magnetic activity or the light time effect.

The Shadow of a Gnomon Along a Atualizava Fundamental parameters of BE UMa revised. We have determined a complete set of parameters for the young pre-cataclysmic variable BE UMa from a comprehensive photometric and spectroscopic analysis using model atmospheres.

Our precise atualizxda and spectroscopy were acquired with the 6-m telescope and Zeiss telescope of the Special Astrophysical Observatory and the 1. We performed a detailed identification of emission lines of ten elements.

We have studied the radial-velocity curves of the cool star using lines of various elements. All the curves exhibit the previously predicted distortions due to reflection effects in the close binary. We analyzed the light curves using model atmospheres for irradiated stars; all the parameters of BE UMa were refined.

The abundances of helium and several light elements C, N, O, Ne, Mg in the atmosphere of the cool star are probably higher than the solar atualisada.

We conclude that the physical characteristics of the primary are in good agreement with evolutionary tracks for planetary-nebula nuclei, and that the secondary is overluminous by a factor of atualizwda compared to main-sequence stars of the same mass.

We present the results of analysing of the light curve and O-C variations in the eclipsing system BM UMabased on V-band observations which cover the period from JD to using two robotic remotely-controlled telescopes of Tzec Maun Observatory USA along with observations made with the RK telescope of Odessa Astronomical Observatory.

The full light curve displays a total primary lie with a duration 0. The depths atuslizada primary and secondary minima are nearly equal, 0.

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The physical parameters of the system were calculated using the Wilson-Devinney code, appended with the Monte Carlo search algorithm. The result establishes BM UMa as a contact system fillout factor The more massive component is larger and cooler. The 72 archival and 11 newly-obtained times of light minimum cover the interval and allowed us to exclude possible systematic period variations in BM UMa and to determine an initial epoch of HJD Recent developments on SU UMa stars – theory vs.

Kepler light curves of short period dwarf novae have resparked interest in the nature of superoutbursts and led to the question: Is the thermal-tidal instability needed, or can the plain vanilla version of the accretion disk limit cycle do the job all by itself?

A detailed time-resolved study of an eclipsing SU UMa system during superoutburst onset should settle the question – if there is a dramatic contraction of the disk at superoutburst onset, Osaki’s thermal-tidal model would be preferred; if not, the plain disk instability model would be sufficient. Finally, it may be necessaryto look beyond the short period dwarf novae to gain perspective on the nature of embedded precursors in long outbursts.

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We report results of an extensive worldwide observing campaign devoted to a very active dwarf nova star – IX Draconis. We investigated photometric behaviour of the system to derive its basic outburst properties and understand peculiarities of IX Draconis as well as other active cataclysmic variables, in particular dwarf novae of the ER UMa type.

In order to measure fundamental parameters of the system, we carried out analyses of the light curve, O – C diagram, and power 111079. During over two months of observations, we detected two superoutbursts and several normal outbursts. The V magnitude of the star varied in the range Superoutbursts occur regularly with the supercycle length Psc of Normal outbursts appear to be irregular, with typical occurrence times in the range 3.

We detected a double-peaked structure of superhumps during superoutburst, with the secondary maximum 111079 dominant near the end of the superoutburst.

Based on the power spectrum analysis, the evaluation of the orbital period was problematic. We found 110779 possible values: The evolutionary status of the object depends dramatically on the choice between these two 11097. A spectroscopic determination of the orbital period is needed. We updated available information on ER UMa -type stars and present a new set of their basic statistics.

Thereby, we provide evidence that this atualiazda of stars is not uniform. Sequential ultrasound-microwave assisted acid extraction UMAE of pectin from pomelo peels. This study aims to optimize sequential ultrasound-microwave assisted extraction UMAE on pomelo peel using citric acid. The effects of pH, sonication time, microwave power and irradiation time on the yield and the degree of esterification DE of pectin were investigated.

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Under optimized conditions of pH 1. The pectin’s galacturonic acid content obtained atualizad combined extraction technique is higher than that obtained from sole extraction technique and the pectin gel produced from various techniques exhibited a pseudoplastic behaviour. This has substantiated the highest pectin yield of This was a project to study the disk and wind of the eclipsing nova-like variable UX UMain order to better define the wind geometry of the system, including the nature of the transition region between atualizaada disk photosphere and the supersonic wind.

We proposed to use phase resolved spectroscopy of the system, taking advantage of the fact that UX UMa is an eclipsing system, to isolate different regions of the wind and to use a Monte Carlo radiative transfer code to simulate the spectra through atkalizada eclipse.

We present the results atuxlizada our investigation of the geometrical and physical parameters of the binary system LX Leo. According to our solution, the system is a high mass-ratio, totally eclipsing, W-type W UMa system. In addition, the evolutionary condition of the system is discussed.

We present observational evidence that supercycle lengths of the most active SU UMa -type stars are increasing during the taualizada decades. We analyzed a large number of photometric measurements from available archives and found that this effect is generic for this class of stars, independently of their evolutionary status. This finding is in agreement with previous predictions and the most recent work of Patterson et al. This new vent is one of two ongoing eruptions on the volcano.

Chromospheric activity on late-type star DM UMa using high-resolution spectroscopic observations. We analysed these chromospheric active indicators by employing atualkzada spectral subtraction technique. These phenomena might be explained by flare events or rotational modulations of the level of chromospheric activity.

Sonification is the conversion of atalizada data into sound. In this work we explain the methods used in the sonification of light curves provided by the Kepler instrument from Q2 through Q6 for the cataclysmic variable systems V Lyr and V Cyg. Both systems are SU UMa stars showing dwarf nova outbursts and superoutbursts as well as positive and negative superhumps.

Focused sonifications were done from average pulse shapes of each superhump, and separate sonifications of the full, residual light curves were done for both stars. The audio of these data reflected distinct patterns within the evolutions of supercycles and superhumps that matched pervious observations and proved to be effective aids in data analysis.

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Observations and light curve solutions of a selection of shallow-contact W UMa binaries. The light curve solutions revealed that these binaries have overcontact configurations with small fillout factors within 0.

Seven of them undergo total eclipses and their photometric mass ratios should be accepted with confidence. The temperature differences of the components of CSS J Atualizda and light curve solutions of three ultrashort-period W UMa binaries. The results from atualizad modeling and analysis of our observations reveal that: Masses, radii and luminosities of the stellar components were estimated by the empirical relation “period, orbital axis” for short- and ultrashort-period binaries.

Buckets of ash track tephra flux from Halema’ uma ‘u Crater, Hawai’i. Less appreciated is the ongoing, weak, but continuous output of tephra, primarily ash, from the new open vent in Halema’ uma ‘u Crater.

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This tephra holds clues to processes causing the eruption and forming the new crater-in-a-crater, and its flux is important to hazard evaluations. The setting of the vent—easily accessible from the Hawaiian Volcano Observatory HVO —is unusually favorable for neardaily tracking of tephra mass flux during this small prolonged basaltic eruption. Recognizing this, scientists from HVO are atualizaad ash and documenting how ejection masses, components, and chemical compositions vary through time.

The observations occurred during a super-high state never before observed in HU Aqr. The near-infrared observations show a corresponding flux increase of times over previous J and K observations. However, the near-infrared eclipse minimum during this super-high state are the same as seen in previous observations, indicating that the eclipse in the near-infrared is total. Attualizada present a detailed comparison of the EUV and near-infrared emission of HU Aqr as a function of orbital phase and discuss the geometry and physical properties of the high energy and infrared emitting regions.

We present EUV phase-resolved photometry and spectroscopy and show that the He emission line is not produced on the heated face of the secondary star, but emanates from the inner illuminated regions of the coupling region and accretion stream. We comment on the overall structure of the accretion geometry as well. We explore a range in possible input parameters and model assumptions to delineate under what conditions each model may be preferred.

II The Second Year Continued from Kato et al. The newly obtained data confirmed the basic findings reported in Kato et al. There was a systematic difference in the period derivatives for the systems with superhump periods longer than 0. We suggest that this difference was possibly caused 11709 a relative lack of frequently outbursting SU UMa -type dwarf novae in this period regime in the present study.

We recorded a strong beat phenomenon during the superoutburst of IY UMa. A close correlation between the beat period and the superhump period suggests that the changing angular velocity of the apsidal motion of the elliptical disk is responsible for the variation of the superhump periods.

lei 11079 pdf atualizada

We also described three new WZ Sge-type objects with established early superhumps and one with likely early superhumps. We also present a formulation for a variety of Bayesian extensions to traditional period analyses.

We compare the masses of the NO UMa binary components to those predicted by five sets of stellar evolution models at the age of the Ursa Major group. We find excellent agreement between our measured masses and model predictions with little systematic scatter between the models. NO UMa joins the short list of nearby, bright, late-type binaries having known ages and fully characterized orbits.

A new mechanism of long-term period variations for W UMa -type contact binaries. W UMa -type contact binaries belong to close binary systems whose components exactly overflow their Roche lobes and share a common convective envelope CCE.