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Journal articles on the topic 'Pulsatoria'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

Fryč, J., R. Kukla, and J. Los. "Possible use of vacuum controlled pulsators for sheep milking machines." Research in Agricultural Engineering 50, No. 1 (2012): 23–27. http://dx.doi.org/10.17221/4922-rae.

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Comparison measurements and evaluation of the suitability of three pulsators for sheep milking machines were carried out, i.e. a prototype made by the manufacturer of the milking parlour of the pulsator ratio 50% (50:50) and two hydraulic pulsators of the Danish manufacturer S.A. Christensen (SAC), models Unipuls-2 of the pulsator ratios 50% (50:50) and 60% (60:40). The specified pulsation rate was 2.5/s(150/min). It was found that the pulsator prototype made by the milking parlour manufacturer slowly passed air, whereby the vacuum in pulsation chambers did not attain the maximum value. Fig. 2

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Burssens, S., D. M. Bowman, C. Aerts, M. G. Pedersen, E. Moravveji та B. Buysschaert. "New β Cep pulsators discovered with K2 space photometry". Monthly Notices of the Royal Astronomical Society 489, № 1 (2019): 1304–20. http://dx.doi.org/10.1093/mnras/stz2165.

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Abstract We present the discovery of three new β Cep pulsators, three new pulsators with frequency groupings, and frequency patterns in a B3Ib star, all of which show pulsations with frequencies as high as about 17 d−1, with K2 space mission photometry. Based on a Fourier analysis and iterative pre-whitening, we present a classification and evaluate the potential for asteroseismic modelling. We include the lists of pulsation frequencies for three new β Cep pulsators, CD-28 12286, CD-27 10876, LS 3978, and additional pulsation mode frequencies for the known β Cep pulsator HD 164741. In addition

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Salazar-Vallejo, Sergio I., Patrick Gillet, and Victor Surugiu. "How false is Nereis falsa (Annelida, Phyllodocida, Nereididae)?" Revista de Biología Tropical 65, no. 3 (2017): 847. http://dx.doi.org/10.15517/rbt.v65i3.26635.

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There are many taxonomic problems in polychaete species names and solving confusing or inadequate taxonomic procedures is both time-demanding and extremely important. Our objective in this contribution was to analyse what is the current taxonomic situation for Nereis falsa de Quatrefages, 1866; it was based upon Nereis pulsatoria? Rathke, 1837 from the Black Sea, and it is currently regarded as having a very wide distribution. The species has been collected from different benthic substrates and even can be found on floating objects or marine turtles. Nereis falsa has been recorded from the Med

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Westwood, J. O. "XV. Observations upon the structural Character of the Death Watch (Atropos pulsatoria), with Description of a new British Genus in the Family to which it belongs." Transactions of the Royal Entomological Society of London 4, no. 1 (2009): 71–72. http://dx.doi.org/10.1111/j.1365-2311.1845.tb01339.x.

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Yatsunskyi, Petro. "THE RESULTS OF RESEARCH PNEUMATIC ELECTROMAGNETIC PULSATOR COMBINED WITH COLLECTOR." Mokslas - Lietuvos ateitis 14 (February 1, 2022): 1–4. http://dx.doi.org/10.3846/mla.2022.15162.

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This article demonstrates the results of experimental research one of the pulsators. Its main difference from others is a pneumatic electromagnetic pulsator in combination with a collector. Therefore, this article describes in detail the process of studying the pulsator. The planned experiment was carried out on by Factorial experiments with multiple factors. The influence of factors (the ripple frequency n, the milk ejection q and the ratio between strokes t/T) on the vacuum pressure in the inter wall chamber of teat cups was studied. The regression equation of the dependence response criteri

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Clausen, Mabel E., and Kurtis A. Williams. "Photometric Monitoring of the ZZ Ceti Star PG 1541+651." Research Notes of the AAS 7, no. 6 (2023): 122. http://dx.doi.org/10.3847/2515-5172/acdc93.

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Abstract The Kepler and K2 missions discovered multiple ZZ Ceti white dwarf pulsators that exhibit recurrent outbursts. These outbursting white dwarfs are near the red edge of the ZZ Ceti instability strip, suggesting that the phenomenon is physically related to the cessation of pulsations. We present multi-day ground-based monitoring of the poorly studied red-edge ZZ Ceti pulsator PG 1541+651. We do not detect any outbursts in our data. We do find that this pulsator has a very rich and time-variable spectrum of modes in its periodogram. The white dwarf lies in the northern continuous viewing

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Zaripova, Lilia, and Vladimir Shaydakov. "Hydromechanical vibrator-pulsator for restoring the injectivity of injection wells." E3S Web of Conferences 524 (2024): 03029. http://dx.doi.org/10.1051/e3sconf/202452403029.

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The article presents a bench model of a vibrator pulsator with a hydromechanical principle of operation designed for processing the bottom-hole zone of the reservoir of injection and production wells, columns of tubing, field pipelines.The design uses a spring-loaded rotary valve. The design of the test bench is described. According to the results of bench tests, the parameters of the pulsator’s stable operation were revealed: at a liquid flow rate of 0.012 m3/s, the oscillation amplitude of the pulsator body was 300 microns, the amplitude of liquid pressure fluctuations was 1.8 MPa at a frequ

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Kurtz, D. W., G. Handler, S. A. Rappaport, et al. "The single-sided pulsator CO Camelopardalis." Monthly Notices of the Royal Astronomical Society 494, no. 4 (2020): 5118–33. http://dx.doi.org/10.1093/mnras/staa989.

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ABSTRACT CO Cam (TIC 160268882) is the second ‘single-sided pulsator’ to be discovered. These are stars where one hemisphere pulsates with a significantly higher amplitude than the other side of the star. CO Cam is a binary star comprised of an Am δ Sct primary star with Teff = 7070 ± 150 K, and a spectroscopically undetected G main-sequence secondary star. The dominant pulsating side of the primary star is centred on the L1 point. We have modelled the spectral energy distribution combined with radial velocities, and independently the TESS light curve combined with radial velocities. Both of t

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9

Jayaraman, Rahul, Saul A. Rappaport, Brian Powell, et al. "TIC 435850195: The Second Triaxial Tidally Tilted Pulsator." Astrophysical Journal 975, no. 1 (2024): 121. http://dx.doi.org/10.3847/1538-4357/ad77c3.

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Abstract The Transiting Exoplanet Survey Satellite (TESS) has enabled the discovery of numerous tidally tilted pulsators (TTPs), which are pulsating stars in close binaries where the presence of a tidal bulge has the effect of tilting the primary star’s pulsation axes into the orbital plane. Recently, the modeling framework developed to analyze TTPs has been applied to the emerging class of triaxial pulsators, which exhibit nonradial pulsations about three perpendicular axes. In this work, we report on the identification of the second-ever discovered triaxial pulsator, with 16 robustly detecte

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Gootkin, Keyan, Marc Hon, Daniel Huber, Daniel R. Hey, Timothy R. Bedding та Simon J. Murphy. "A New Catalog of 100,000 Variable TESS A-F Stars Reveals a Correlation between δ Scuti Pulsator Fraction and Stellar Rotation". Astrophysical Journal 972, № 2 (2024): 137. http://dx.doi.org/10.3847/1538-4357/ad5282.

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Abstract δ Scuti variables are found at the intersection of the classical instability strip and the main sequence on the Hertzsprung–Russell diagram. With space-based photometry providing millions of light curves of A-F type stars, we can now probe the occurrence rate of δ Scuti pulsations in detail. Using the 30 minutes cadence light curves from NASA's Transiting Exoplanet Survey Satellite's first 26 sectors, we identify variability in 103,810 stars within 5–24 cycles per day down to a magnitude of T = 11.25. We fit the period–luminosity relation of the fundamental radial mode for δ Scuti sta

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Lashlee, Taylor, Adrienne DiFoggio, Pablo Jarrin-Yepez, et al. "Breeding soundness examination in a clouded leopard." Clinical Theriogenology 14, no. 2 (2022): 98–101. http://dx.doi.org/10.58292/ct.v14.9284.

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A 3-year male clouded leopard was presented to the University of Tennessee College of Veterinary Medicine Theriogenology servicesfor a breeding soundness examination. On physical examination, the left testis felt abnormally small. On ultrasonography,no abnormalities were observed; testis and prostate were of normal size. Semen was collected with a pulsator electroejaculatorand a ram electroejaculator probe (commonly used to collect semen in small ruminants). The purpose of using this electroejaculatorand probe was to determine if they could be used to collect semen from a clouded leopard. Usin

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Drapalyuk, Mikhail, Aleksey Platonov, and Petr Popikov. "Modelling of the working process of the hydraulic pulsator of forest machine manipulator." Forestry Engineering Journal 15, no. 2 (2025): 191–206. https://doi.org/10.34220/issn.2222-7962/2025.2/12.

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The article studies and simulates of the working process of the hydraulic pulsator used in the manipulators of forestry machines. Manipulator units of these machines play a key role in the performance of technological operations in the preparation of areas for growing forest crops, as well as in their subsequent maintenance. To increase the effi-ciency of operations such as cutting or removing unwanted tree and shrub vegetation, removing stones, boulders and other obstacles, the modernization of manipulators is an actual direction. One of the promising ways to reduce the en-ergy intensity of t

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Byrne, Conor M., and C. Simon Jeffery. "Pulsation in faint blue stars." Monthly Notices of the Royal Astronomical Society 492, no. 1 (2019): 232–44. http://dx.doi.org/10.1093/mnras/stz3486.

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ABSTRACT Following the discovery of blue large-amplitude pulsators (BLAPs) by the OGLE survey, additional hot, high-amplitude pulsating stars have been discovered by the Zwicky Transient Facility. It has been proposed that all of these objects are low-mass pre-white dwarfs and that their pulsations are driven by the opacity of iron-group elements. With this expanded population of pulsating objects, it was decided to compute a sequence of post-common-envelope stellar models using the mesa stellar evolution code and to examine the pulsation properties of low-mass pre-white dwarfs using non-adiab

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14

Karczmarek, P. "Contamination of RR Lyrae stars from Binary Evolution Pulsators." Advances in Astronomy and Space Physics 5, no. 1 (2015): 24–28. http://dx.doi.org/10.17721/2227-1481.5.24-28.

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A Binary Evolution Pulsator (BEP) is a low-mass (0.26 𝔐☉) member of a binary system, which pulsates as a result of a former mass transfer to its companion. The BEP mimics RR Lyrae-type pulsations, but has completely different internal structure and evolution history. Although there is only one known BEP (OGLE-BLG-RRLYR-02792), it has been estimated that approximately 0.2% of objects classified as RR Lyrae stars can be undetected Binary Evolution Pulsators. In the present work, this contamination value is re-evaluated using the population synthesis method. The output falls inside a range of val

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15

Gritsay, D. I., A. G. Nemtsev, V. V. Odnoprienko, and A. I. Gritsay. "Electronic Pair-Action Pulsator of the Milking Machine." Elektrotekhnologii i elektrooborudovanie v APK 70, no. 2(51) (2023): 88–92. http://dx.doi.org/10.22314/2658-4859-2023-70-2-88-92.

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The dairy cattle breeding market is analyzed. The dairy industry in the country remains one of the most problematic aspects of the economy, despite unprecedented measures of state support. (Research purpose) The research purpose is increasing the efficiency of machine milking of cows by developing and justifying the design and operating parameters of a milking machine with an electromagnetic pulsator, which allows reducing the negative impact of irritating factors during milking on animal health, ensuring fast and comfortable milking, increasing milk yield, eliminating the possibility of vacuu

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16

Gaulme, Patrick, and Joyce A. Guzik. "Systematic search for stellar pulsators in the eclipsing binaries observed by Kepler." Astronomy & Astrophysics 630 (September 27, 2019): A106. http://dx.doi.org/10.1051/0004-6361/201935821.

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Eclipsing binaries (EBs) are unique targets for measuring precise stellar properties and can be used to constrain stellar evolution models. In particular, it is possible to measure masses and radii of both components of a double-lined spectroscopic EB at the percent level. Since the advent of high-precision photometric space missions (MOST, CoRoT, Kepler, BRITE, TESS), the use of stellar pulsation properties to infer stellar interiors and dynamics constitutes a revolution for studies of low-mass stars. The Kepler mission has led to the discovery of thousands of classical pulsators such as δ Sc

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17

Evans, Nancy Remage. "Recent Results on Binary Cepheids." International Astronomical Union Colloquium 139 (1993): 398–405. http://dx.doi.org/10.1017/s0252921100118056.

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AbstractIUE observations of hot companions of Cepheids have been used to determine the temperatures of the companions. For companions on the ZAMS, the temperatures can be used to determine the luminosity of the Cepheids from the inferred absolute magnitude of the companion. The accuracy of this method is comparable to the accuracy of calibration using Cepheids in clusters. An over-tone pulsator (SU Cas) has been identified by this technique. The luminosity of the double mode pulsator Y Car agrees with that from the PLC, confirming that is a normal Population I Cepheid. The variation of the wid

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Winget, D. E., and C. F. Claver. "Discovery of the sixth DBV Star: CBS 114." International Astronomical Union Colloquium 114 (1989): 290–92. http://dx.doi.org/10.1017/s0252921100099735.

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Though widely spread across the H-R diagram the compact pulsators have much in common. All are multi-periodic, and most have extremely complex light curves. All appear to be pulsating in nonradial g-modes, with temperature variations responsible for the bulk of the light modulations. The g-modes are global in nature and, typically, many are excited in each pulsator, so they are a rich source of seismological information about the interior regions of the white dwarf stars.The pulsating DB white dwarf stars (DBV’s) form one of the three distinct classes of pulsating compact objects currently kno

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19

Byrne, C. M., E. R. Stanway, and J. J. Eldridge. "Binary evolution pathways of blue large-amplitude pulsators." Monthly Notices of the Royal Astronomical Society 507, no. 1 (2021): 621–31. http://dx.doi.org/10.1093/mnras/stab2115.

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ABSTRACT Blue large-amplitude pulsators (BLAPs) are a recently discovered class of pulsating star, believed to be proto-white dwarfs, produced by mass stripping of a red giant when it has a small helium core. An outstanding question is why the stars in this class of pulsator seem to form two distinct groups by surface gravity, despite predictions that stars in the gap between them should also pulsate. We use a binary population synthesis model to identify potential evolutionary pathways that a star can take to become a BLAP. We find that BLAPs can be produced either through common envelope evo

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Fontaine, G., P. Brassard, P. Bergeron, and F. Wesemael. "White Dwarf Seismology at the Université de Montréal." International Astronomical Union Colloquium 139 (1993): 120. http://dx.doi.org/10.1017/s0252921100117063.

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Over the last several years, we have developed a comprehensive program aimed at better understanding the properties of pulsating DA white dwarfs (or ZZ Ceti stars). These stars are nonradial pulsators of the g-type, and their study can lead to inferences about their internal structure. For instance, the period spectrum of a white dwarf is most sensitive to its vertical chemical stratification, and one of the major goals of white dwarf seismology is to determine the thickness of the hydrogen layer that sits on top of a star. This can be done, in principle, by comparing in detail theoretical per

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Kudzys, Algirdas. "CRACKING AND BEARING CAPACITY OF REPAIRED REINFORCED CONCRETE WALL-FLOOR JOINTS/SUREMONTUOTŲ MONOLITINIŲ SIENŲ IR PERDANGŲ SANDŪRŲ PLEIŠĖJIMAS IR LAIKOMOJI GALLA." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 3, no. 11 (1997): 24–29. http://dx.doi.org/10.3846/13921525.1997.10531349.

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Nagrinėjamos supleišėjusių ar kitaip pažeistų pastatų laikančių jų konstrukcijų bei jų sandūrų atstatymo ir remonto problemos. Jos ypač svarbios dėi tos priežasties, kad realaus pastato suremontuotų konstrukcijų laikomosios galios įvertinimas yra labai sudėtingas. Neardančiais bandymais pakankamai tiksliai galima nustatyti medžiagų fizinesmechanines savybes, tačiau konstrukcijos stiprumo įvertinimas negali būti patikimas, neatlikus laboratorinių eksperimentų su natūralaus dydžio modeliais. Eksperimentinių tyrimų metu buvo išbandyti daugiaaukščių gyvenamųjų namų gelžbetoninių monolitinių sienų

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Wołosz, Krzysztof J. "Energy Analysis of an Industrial Nozzle with Variable Outlet Conditions during Compressible and Transient Airflow." Energies 15, no. 3 (2022): 841. http://dx.doi.org/10.3390/en15030841.

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The nozzle which is applied in industrial pneumatic pulsators is studied. It is a part of the system for unclogging the drains and outlets of silos and hoppers for loose materials. The nozzle is required to achieve the lowest level of energy losses while directing the airflow, which impacts the loose material bed. The energy rate transferred into the bed depends on the temperature and pressure differences between the inlet and outlet of the nozzle. In this study, the available energy is determined assuming compressible and transient airflow through the nozzle, which is a part of the industrial

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Wolosz, Krzysztof J., and Jacek Wernik. "Three-Dimensional Flow Optimization of a Nozzle with a Continuous Adjoint." International Journal of Nonlinear Sciences and Numerical Simulation 16, no. 3-4 (2015): 151–56. http://dx.doi.org/10.1515/ijnsns-2014-0011.

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AbstractThe article presents results of multi-criteria optimization of air nozzle topology. The optimization in the CFD has been recently developed since equations of flow in porous media were applied among others governing equations. Optimization is a seeking for extremum of an objective function with respect to the function constraints. With this definition in mind, the optimization by using a continuous adjoint for the current cases is a finding such channel topology which minimizes for example pressure or energy loss when the constraints of objective function are in the form of flow govern

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Wołosz, Krzysztof J., and Jacek Wernik. "ICEEM07: Three-Dimensional Flow Optimization of a Pneumatic Pulsator Nozzle with a Continuous Adjoint." International Journal of Nonlinear Sciences and Numerical Simulation 16, no. 1 (2015): 3–9. http://dx.doi.org/10.1515/ijnsns-2014-0043.

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AbstractThe article presents results of multi-criteria optimization of air nozzle topology. The optimization in the Computational Fluid Dynamics (CFD) has been recently developed since equations of flow in porous media were applied among others governing equations. Optimization is a seeking for extremum of an objective function with respect to the function constraints. With this definition in mind, the optimization by using a continuous adjoint for the current cases is a finding such channel topology which minimizes for example pressure or energy loss when the constraints of objective function

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Charpinet, S., P. Brassard, G. Fontaine, et al. "TESS first look at evolved compact pulsators." Astronomy & Astrophysics 632 (December 2019): A90. http://dx.doi.org/10.1051/0004-6361/201935395.

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Context. The TESS satellite was launched in 2018 to perform high-precision photometry from space over almost the whole sky in a search for exoplanets orbiting bright stars. This instrument has opened new opportunities to study variable hot subdwarfs, white dwarfs, and related compact objects. Targets of interest include white dwarf and hot subdwarf pulsators, both carrying high potential for asteroseismology. Aims. We present the discovery and detailed asteroseismic analysis of a new g-mode hot B subdwarf (sdB) pulsator, EC 21494−7018 (TIC 278659026), monitored in TESS first sector using 120-s

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Myslinski, Adam, Bazyli Semeniuk, and Teresa Kasprzycka-Guttman. "Electrodynamic pulsator." Industrial & Engineering Chemistry Research 32, no. 11 (1993): 2934–36. http://dx.doi.org/10.1021/ie00023a067.

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Østerås, Olav, Odd Rønningen, Leiv Sandvik, and Steinar Waage. "Field studies show associations between pulsator characteristics and udder health." Journal of Dairy Research 62, no. 1 (1995): 1–13. http://dx.doi.org/10.1017/s0022029900033628.

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SummaryFour different field studies including 64, 140, 850 and 180 herds were used to investigate the association between pulsator characteristics and udder health. The results indicate that the best udder health is found in herds with a d phase > 330 ms and a pulsation rate > 55 min-1. A d phase of < 250 ms was associated with significant elevation in bulk milk somatic cell count, a higher incidence of acute clinical mastitis and a higher frequency of cows having mastitis associated with major pathogens (mainly Staphylococcus aureus) as compared with a d phase of > 331 ms. There w

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Antoci, V., M. S. Cunha, D. M. Bowman та ін. "The first view of δ Scuti and γ Doradus stars with the TESS mission". Monthly Notices of the Royal Astronomical Society 490, № 3 (2019): 4040–59. http://dx.doi.org/10.1093/mnras/stz2787.

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ABSTRACT We present the first asteroseismic results for δ Scuti and γ Doradus stars observed in Sectors 1 and 2 of the TESS mission. We utilize the 2-min cadence TESS data for a sample of 117 stars to classify their behaviour regarding variability and place them in the Hertzsprung–Russell diagram using Gaia DR2 data. Included within our sample are the eponymous members of two pulsator classes, γ Doradus and SX Phoenicis. Our sample of pulsating intermediate-mass stars observed by TESS also allows us to confront theoretical models of pulsation driving in the classical instability strip for the

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Randall, Suzanna, Gilles Fontaine, Pierre Brassard, and Stéphane Charpinet. "Modelling compact pulsators." Journal of Physics: Conference Series 118 (October 1, 2008): 012022. http://dx.doi.org/10.1088/1742-6596/118/1/012022.

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Eze, Christian I., та Gerald Handler. "β Cephei Pulsators in Eclipsing Binaries Observed with TESS". Astrophysical Journal Supplement Series 272, № 2 (2024): 25. http://dx.doi.org/10.3847/1538-4365/ad39c5.

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Abstract The combined strength of asteroseismology and empirical stellar basic parameter determinations for in-depth asteroseismic analysis of massive pulsators in eclipsing binaries shows great potential for treating the challenging and mysterious discrepancies between observations and models of stellar structure and the evolution of massive stars. This paper compiles a comprehensive list of massive pulsators in eclipsing binary systems observed with TESS. The TESS light curves and discrete Fourier transforms of a sample of 8055 stars of spectral type B0–B3 were examined for eclipses and stel

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Rui, Nicholas Z., Jim Fuller, and J. M. Joel Ong. "It’s Not Just a Phase: Oblique Pulsations in Magnetic Red Giants and Other Stochastic Oscillators." Astrophysical Journal Letters 985, no. 2 (2025): L39. https://doi.org/10.3847/2041-8213/add5e2.

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Abstract Magnetic fields play a significant role in stellar evolution. In the last few years, asteroseismology has enabled the measurement of strong magnetic fields 104–106 G in the cores of dozens of red giants and is the only known way to directly measure internal stellar magnetic fields. However, current data are still interpreted assuming that these fields are too weak or too axisymmetric to affect the orientation of the pulsations (i.e., make the pulsations “oblique”), rendering stronger field strengths beyond the reach of existing asteroseismic searches. We show that, even when an obliqu

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Dziembowski, Wojciech A. "The Opacity Driven Pulsators." Highlights of Astronomy 10 (1995): 584–85. http://dx.doi.org/10.1017/s1539299600012156.

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The opacity mechanism is the only well understood excitation mechanism of observed stellar oscillations. The driving effect arises due the a specific form of the opacity perturbation which leads to a conversion of the radiative flux energy into kinetic energy of oscillations. In 1963 Baker and Kippenhan demonstrated that the opacity mechanism acting in the Hell ionization zone is the cause of the Cepheid pulsations. Subsequently it has been shown that the same mechanism works in a large variety of stars. There are three opacity bumps that play a role in pulsation excitation in various types of

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Hey, Daniel, and Conny Aerts. "Confronting sparse Gaia DR3 photometry with TESS for a sample of around 60 000 OBAF-type pulsators." Astronomy & Astrophysics 688 (August 2024): A93. http://dx.doi.org/10.1051/0004-6361/202450489.

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Context. The Gaia mission has delivered hundreds of thousands of variable star light curves in multiple wavelengths. Recent work demonstrates that these light curves can be used to identify (non-)radial pulsations in OBAF-type stars, despite their irregular cadence and low light curve precision, of the order of a few millimagnitudes. With the considerably more precise TESS photometry, we revisited these candidate pulsators to conclusively ascertain the nature of their variability. Aims. We seek to re-classify the Gaia light curves with the first two years of TESS photometry for a sample of 58

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Randall, S. K., G. Fontaine, S. Charpinet, V. Van Grootel, and P. Brassard. "Origin and pulsation of hot subdwarfs." Proceedings of the International Astronomical Union 9, S301 (2013): 289–96. http://dx.doi.org/10.1017/s1743921313014476.

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AbstractWe briefly introduce hot subdwarfs and their evolutionary status before discussing the different types of known pulsators in more detail. Currently, at least six apparently distinct types of variable are known among hot subdwarfs, encompassing p- as well as g-mode pulsators and objects in the Galactic field as well as in globular clusters. Most of the oscillations detected can be explained in terms of an iron opacity mechanism, and quantitative asteroseismology has been very successful for some of the pulsators. In addition to helping constrain possible evolutionary scenarios, studies

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Bednarek, Stanisław. "Sterowany elektromagnetycznie pulsator akustyczny." PRZEGLĄD ELEKTROTECHNICZNY 1, no. 10 (2022): 314–19. http://dx.doi.org/10.15199/48.2022.10.69.

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Przybilla, Norbert, та Maria-Fernanda Nieva. "The chemical composition of β Cephei and hybrid pulsators in the solar neighbourhood". Proceedings of the International Astronomical Union 11, A29B (2015): 485–88. http://dx.doi.org/10.1017/s1743921316005949.

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Abstractβ Cephei variables are the most prominent pulsators among the massive stars on the upper main sequence, extending into the class of the rare hybrid β Cephei-SPB pulsators in the overlap region with the instability strip of the Slowly Pulsating B-stars. While the κ-mechanism has been identified as the driver of the pulsations, a comprehensive explanation of the excitation of the observed p- and g-modes is still lacking. In particular, the instability regions for these main-sequence B-type pulsators are still not fully consistent with any current opacity calculations. We have determined

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Beaulieu, J. P. "EROS: Short Period Cepheids in the Bar of the LMC." International Astronomical Union Colloquium 155 (1995): 260–69. http://dx.doi.org/10.1017/s0252921100037088.

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AbstractWe present Fourier analysis at 490 nm for 87 Cepheid light curves in the bar of the Large Magellanic Cloud. The photometry has been obtained through the EROS project whose main purpose is the search for baryonic dark matter in the Galactic halo. The very high quality of the photometry and the good phase coverage enable us to obtain accurate Fourier decomposition of the light curves. As a consequence we confirm that the so-called s-Cepheids are overtone pulsators and represent about 30 % of our sample, whereas the Classical Cepheids are fundamental pulsators. We have identified a number

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Handler, G. "”Hybrid” pulsators – fact or fiction?" Communications in Asteroseismology 159 (2009): 42–44. http://dx.doi.org/10.1553/cia159s42.

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Dziembowski, W. A. "Asteroseismology of rapidly rotating pulsators." Proceedings of the International Astronomical Union 5, H15 (2009): 360–61. http://dx.doi.org/10.1017/s1743921310009804.

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AbstractOscillation frequencies were determined for a number of rapidly rotating main sequence stars. However, real seismic probing is still ahead of us. I review here tools that we have for modeling pulsation in rotating stars and their potential application to seismic sounding.

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Østensen, R., U. Heber, R. Silvotti, J. E. Solheim, S. Dreizler, and H. Edelmann. "Four new subdwarf B pulsators." Astronomy & Astrophysics 378, no. 2 (2001): 466–76. http://dx.doi.org/10.1051/0004-6361:20011218.

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Mantegazza, L., and E. Poretti. "First overtone pulsators among Cepheids." International Astronomical Union Colloquium 139 (1993): 370. http://dx.doi.org/10.1017/s0252921100117877.

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The Fourier decomposition has been successfully applied to several classes of pulsating variables. Antonello and Poretti (1986) and Antonello et al. (1990a) applied it to the Cepheids with P < 8 d. The latter authors redefined the s – Cepheids a Population I Cepheids that do not follow the Hertzsprung progression, but have progression of their own. The same authors proposed a new denomination (Antonell et al., 1990b): C-a stars to indicate the Classical Cepheids and C-b stars to indicate the redefined s–Cepheids.The new photometric data obtained at La Silla and Merate Observatories (Mantega

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Kovács, G. "Nonradial Pulsations in Classical Pulsators." International Astronomical Union Colloquium 185 (2002): 396–403. http://dx.doi.org/10.1017/s0252921100016614.

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AbstractRecent analyses of photometric data on globular clusters and galaxies enabled us to study more closely the long-periodic amplitude/phase modulation (Blazhko effect) in classical variables. In the frequency spectra of these stars we see either a doublet or an equally-spaced triplet with a very small frequency separation close to the main component. None of the available theoretical models are able to explain this behavior without invoking some form of nonradial pulsation. In this review we describe the observational status of the Blazhko variables, and discuss the limits of the applicab

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Østensen, R. H., R. Silvotti, S. Charpinet, et al. "First Kepler results on compact pulsators - I. Survey target selection and the first pulsators." Monthly Notices of the Royal Astronomical Society 409, no. 4 (2010): 1470–86. http://dx.doi.org/10.1111/j.1365-2966.2010.17366.x.

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Wernik, Jacek, and Krzysztof J. Wołosz. "Study of Heat Transfer in Pneumatic Pulsator." Applied Mechanics and Materials 797 (November 2015): 320–26. http://dx.doi.org/10.4028/www.scientific.net/amm.797.320.

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The article presents selected results of research work aimed to rationalize and optimize the design of the pneumatic pulsator due to thermal conditions. Pneumatic pulsator is a device used in industry storing bulk and loose materials. It is attached to the silo, allowing their correct operation. The air friction against the inner wall of the pulsator causes the release of heat. In order to investigate the conditions of heat transfer, thermal calculations were made and then numerical simulations using Computational Fluid Dynamics (CFD) were conducted. Various fins options were examined. The obj

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Kim, Seung-Lee, Chung-Uk Lee, Kyeongsoo Hong, et al. "KMTNet View of Blue Large-amplitude Pulsators Toward the Galactic Bulge. I. Discovery of Wide-orbit Companions in OGLE-BLAP-006." Astronomical Journal 169, no. 5 (2025): 261. https://doi.org/10.3847/1538-3881/adc4e4.

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Abstract Blue large-amplitude pulsators (BLAPs), a recently classified type of variable stars, are evolved objects likely formed through interactions between stars in a binary system. However, only two BLAPs with stellar companions have been discovered to date. This paper presents photometric data from the Korea Microlensing Telescope Network (KMTNet) for three BLAPs located in the direction of the Galactic bulge: OGLE-BLAP-006, OGLE-BLAP-007, and OGLE-BLAP-009. The data were collected over eight consecutive years, beginning in 2016, with a high cadence of approximately 15 minutes. Frequency a

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Rodríguez, Eloy, Angel Rolland та Pilar López de Coca. "ρ Pup: A Monoperiodic Radially Pulsating δ Set Star". International Astronomical Union Colloquium 139 (1993): 430. http://dx.doi.org/10.1017/s0252921100118202.

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Abstractρ Pup is a δ Scuti type pulsator with relatively low amplitude (ΔV∼0.m09). Analysis of the data from different sources, using the Fourier Transform method, establishes ρ Pup as a monoperiodic pulsator. Using the classical O-C method, it is found that the pulsation of this star can be well described by means of a linear ephemeris with a period of P=0.d140881372 over more than eighty years. The nature of radial or nonradial pulsation is discussed on the basis on the derived phase shifts and amplitude ratios between different colours. The results indicate that ρ Pup is a radial pulsator.

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POPESCU, DUMITRU, and DIANA R. RADNEF–CONSTANTIN. "The amounts of osmotic solute released by the pulsating liposome during its activity." Romanian Reports in Physics 77, no. 2 (2025): 602. https://doi.org/10.59277/romrepphys.2025.77.602.

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In this paper we consider an unilamellar liposome (lipid vesicle) filled with aqueous solution of an osmotic solute. This liposome is introduced in an aqueous medium of large dimensions. Due to the osmosis process the liposome swells to a critical size, when a transmembranar pore suddenly appears. Part of the internal solution leaks through this pore and the liposome elaxes and returns to its initial size. The swelling starts again and the liposome begins a new cycle and so on. The evolution of the liposome is a dynamic and cyclical process. After performing a number of cycles, the pulsatory l

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Charpinet, S., V. Van Grootel, S. K. Randall, et al. "New advances in asteroseismology of pulsating hot subdwarf stars." Proceedings of the International Astronomical Union 5, H15 (2009): 357. http://dx.doi.org/10.1017/s1743921310009774.

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AbstractHot subdwarf stars (of the sdB and sdO type) host three known classes of nonradial pulsators. Two of them feature short period (P ~ 60 - 600 s) accoustic mode oscillations, while the third group is characterized by slow g-mode deformations with periods of ~ 1 - 2h. These pulsations offer favorable grounds to infer some of the internal properties of these objects through asteroseismology. This has been exploited for the rapid p-mode sdB pulsators and the present contribution reviews some of the recent advances in this field. The long period g-mode pulsators, whose vibrations probe much

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Dziembowski, W. A. "B Star Pulsation - Theory and Seismological Prospects." Symposium - International Astronomical Union 185 (1998): 355–60. http://dx.doi.org/10.1017/s007418090023893x.

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Progress in understanding B-type pulsators has been reviewed at several recent meetings (e.g. Dziembowski, 1993, 1995; Moskalik, 1995). Not much happened afterwards. Owing to further improvement in the stellar opacity calculations (Iglesias and Rogers 1996), the theoretical pulsation-instability domain in the upper Main Sequence is now more precisely determined. In the next section I will compare the predicted domain with the positions of various B-type pulsators in the H-R diagram.

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Szabados, L. "Interrelation of Modal Amplitudes of Double-Mode Pulsators." International Astronomical Union Colloquium 185 (2002): 418–19. http://dx.doi.org/10.1017/s0252921100016687.

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AbstractDuring the study of the factors governing the modal amplitudes of the double-mode radial pulsators, it has been found that the R21 Fourier parameter deduced from the light curves is in a relationship with the ratio of the modal amplitudes, for beat Cepheids and RR Lyrae variables, as well. The form of this relation gives a natural explanation for the fact that double-mode pulsators with slightly excited second modes do not exist.

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