Log in

Relevant bibliographies by topics / Couple orbital de rotation / Journal articles

To see the other types of publications on this topic, follow the link: Couple orbital de rotation.

Journal articles on the topic 'Couple orbital de rotation'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Couple orbital de rotation.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Bolmont, E., F. Gallet, S. Mathis, C. Charbonnel, L. Amard, and Y. Alibert. "Tidal dissipation in rotating low-mass stars and implications for the orbital evolution of close-in massive planets." Astronomy & Astrophysics 604 (August 2017): A113. http://dx.doi.org/10.1051/0004-6361/201730662.

Full text

Abstract:

Observations of hot-Jupiter exoplanets suggest that their orbital period distribution depends on the metallicity of the host stars. We investigate here whether the impact of the stellar metallicity on the evolution of the tidal dissipation inside the convective envelope of rotating stars and its resulting effect on the planetary migration might be a possible explanation for this observed statistical trend. We use a frequency-averaged tidal dissipation formalism coupled to an orbital evolution code and to rotating stellar evolution models in order to estimate the effect of a change of stellar m

APA, Harvard, Vancouver, ISO, and other styles

2

Pezzotti, C., P. Eggenberger, G. Buldgen, G. Meynet, V. Bourrier, and C. Mordasini. "Revisiting Kepler-444." Astronomy & Astrophysics 650 (June 2021): A108. http://dx.doi.org/10.1051/0004-6361/202039652.

Full text

Abstract:

Context. Kepler-444 is one of the oldest planetary systems known thus far. Its peculiar configuration consisting of five sub-Earth-sized planets orbiting the companion to a binary stellar system makes its early history puzzling. Moreover, observations of HI-Lyα variations raise many questions about the potential presence of escaping atmospheres today. Aims. We aim to study the orbital evolution of Kepler-444-d and Kepler-444-e and the impact of atmospheric evaporation on Kepler-444-e. Methods. Rotating stellar models of Kepler-444-A were computed with the Geneva stellar evolution code and coup

APA, Harvard, Vancouver, ISO, and other styles

3

Vetrisano, Massimo, Camilla Colombo, and Massimiliano Vasile. "Asteroid rotation and orbit control via laser ablation." Advances in Space Research 57, no. 8 (2015): 1762–82. https://doi.org/10.1016/j.asr.2015.06.035.

Full text

Abstract:

This paper presents an approach to control the rotational motion of an asteroid while a spacecraft is deflecting its trajectory through laser ablation. During the deflection, the proximity motion of the spacecraft is coupled with the orbital and rotational motion of the asteroid. The combination of the deflection acceleration, solar radiation pressure, gravity field and plume impingement will force the spacecraft to drift away from the asteroid. In turn, a variation of the motion of the spacecraft produces a change in the modulus and direction of the deflection action which modifies the rotati

APA, Harvard, Vancouver, ISO, and other styles

4

Daley, Thomas M., and Dale Cox. "Orbital vibrator seismic source for simultaneous P‐ and S‐wave crosswell acquisition." GEOPHYSICS 66, no. 5 (2001): 1471–80. http://dx.doi.org/10.1190/1.1487092.

Full text

Abstract:

A recently developed borehole seismic source, the orbital vibrator, was successfully deployed in a crosswell survey in a fractured basalt aquifer. This seismic source uses a rotating eccentric mass to generate seismic energy. Source sweeps with clockwise and counter‐clockwise rotations are recorded at each source location. Because this source generates circularly polarized waves, unique processing algorithms are used to decompose the recordings into two equivalent linearly oscillating, orthogonally oriented seismic sources. The orbital vibrator therefore generates P‐ and S‐waves simultaneously

APA, Harvard, Vancouver, ISO, and other styles

5

Lindh, Grant D., Taylor J. Mach, and T. Daniel Crawford. "The optimized orbital coupled cluster doubles method and optical rotation." Chemical Physics 401 (June 2012): 125–29. http://dx.doi.org/10.1016/j.chemphys.2011.11.002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Li, Liang, and Yiqiu Mao. "On Dynamics of Double-Diffusive Convection in a Rotating Couple-Stress Fluid Layer." Mathematics 12, no. 7 (2024): 1017. http://dx.doi.org/10.3390/math12071017.

Full text

Abstract:

The current article focuses on the examination of nonlinear instability and dynamic transitions in a double-diffusive rotating couple-stress fluid layer. The analysis was based on the newly developed dynamic transition theory by T. Ma and S. Wang. Through a comprehensive linear spectrum analysis and investigation of the principle of exchange of stability (PES) as the thermal Rayleigh number crosses a threshold, the nonlinear orbital changes during the transition were rigorously elucidated utilizing reduction methods. For both single real and complex eigenvalue crossings, local pitch-fork and H

APA, Harvard, Vancouver, ISO, and other styles

7

Yeomans, D. K. "Cometary Orbital Dynamics and Astrometry." International Astronomical Union Colloquium 116, no. 1 (1989): 3–17. http://dx.doi.org/10.1017/s0252921100109613.

Full text

Abstract:

AbstractComets are the only large solar system bodies where nongravitational forces directly affect their dynamic motions. Their approach to within a few AU of the Sun initiates the vaporization of nucleus ices, and the resulting rocket-like effects either add to or subtract from the comet’s orbital energy; the sign of the energy change depends upon the comet’s rotation direction and its spin pole orientation. The cometary outgassing phenomena have generally been modeled by assuming a rapidly rotating nucleus of water ice that outgasses symmetrically with respect to perihelion. Although this n

APA, Harvard, Vancouver, ISO, and other styles

8

Gallet, F., E. Bolmont, J. Bouvier, S. Mathis, and C. Charbonnel. "Planetary tidal interactions and the rotational evolution of low-mass stars." Astronomy & Astrophysics 619 (November 2018): A80. http://dx.doi.org/10.1051/0004-6361/201833576.

Full text

Abstract:

Context. The surface angular velocity evolution of low-mass stars is now globally understood and the main physical mechanisms involved in it are observationally quite constrained. However, while the general behaviour of these mechanisms is grasped, their theoretical description is still under ongoing work. This is the case, for instance, about the description of the physical process that extracts angular momentum from the radiative core, which could be described by several theoretical candidates. Additionally, recent observations showed anomalies in the rotation period distribution of open clu

APA, Harvard, Vancouver, ISO, and other styles

9

Felker, Peter M. "Nuclear-orbital/configuration-interaction study of coupled translation-rotation states in (H2)2@C70." Journal of Chemical Physics 138, no. 4 (2013): 044309. http://dx.doi.org/10.1063/1.4776262.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Borre, C. C., D. Baade, A. Pigulski, et al. "Short-term variability and mass loss in Be stars." Astronomy & Astrophysics 635 (March 2020): A140. http://dx.doi.org/10.1051/0004-6361/201937062.

Full text

Abstract:

Context. Be stars are physically complex systems that continue to challenge theory to understand their rapid rotation, complex variability, and decretion disks. γ Cassiopeiae (γ Cas) is one such star but is even more curious because of its unexplained hard thermal X-ray emission. Aims. We aim to examine the optical variability of γ Cas and thereby to shed more light on its puzzling behaviour. Methods. We analysed 321 archival Hα spectra from 2006 to 2017 to search for frequencies corresponding to the 203.5 day orbit of the companion. Space photometry from the SMEI satellite from 2003 to 2011 a

APA, Harvard, Vancouver, ISO, and other styles

11

Belokonov, I. V., I. A. Timbai, P. N. Nikolaev, and U. M. Orazbaeva. "Analysis of SamSat-218D nanosatelite motion acording to trajectory measurements." VESTNIK of Samara University. Aerospace and Mechanical Engineering 18, no. 4 (2020): 18–28. http://dx.doi.org/10.18287/2541-7533-2019-18-4-18-28.

Full text

Abstract:

The motion of the SamSat-218D nanosatellite is analyzed by trajectory measurements. Special features of nanosatellite behavior in low orbits were experimentally confirmed. These features are due to both the influence of the atmosphere and the nanosatellites’ inherent mass-inertia characteristics: the orbital lifetime of nanosatellites is shorter, whereas angular acceleration generated by the aerodynamic moment couple is much higher than that of satellites with large sizes and masses. Variation of the ballistic coefficient in time is estimated from known trajectory measurements and information

APA, Harvard, Vancouver, ISO, and other styles

12

Sun 孙, Meng 萌., Seth Gossage, Emily M. Leiner, and Aaron M. Geller. "Stellar Spin-down in Post-mass-transfer Binary Systems." Astrophysical Journal 971, no. 1 (2024): 80. http://dx.doi.org/10.3847/1538-4357/ad54be.

Full text

Abstract:

Abstract Motivated by measurements of the rotation speed of accretor stars in post-mass-transfer (post-MT) systems, we investigate how magnetic braking affects the spin-down of individual stars during binary evolution with the MESAbinary module. Unlike the conventional assumption of tidal synchronization coupled with magnetic braking in binaries, we first calculate whether tides are strong enough to synchronize the orbit. Subsequently, this influences the spin-down of stars and the orbital separation. In this study, we apply four magnetic braking prescriptions to reduce the spin angular moment

APA, Harvard, Vancouver, ISO, and other styles

13

Kumari, Sangita, Bhaswati Bhattacharyya, Rahul Sharan, et al. "Unveiling Frequency-dependent Eclipsing in Spider Millisecond Pulsars Using Broadband Polarization Observations with the Parkes." Astrophysical Journal 973, no. 1 (2024): 19. http://dx.doi.org/10.3847/1538-4357/ad6145.

Full text

Abstract:

Abstract This study presents an orbital-phase-dependent analysis of three black widow spider millisecond pulsars (BW MSPs), aiming to investigate the magnetic field within the eclipse environment. The ultrawide-bandwidth low-frequency receiver of the Parkes Murriyang radio telescope is utilized for full polarization observations covering frequencies from 704−4032 MHz. Depolarization of pulsed emission is observed during the eclipse phase of three BW MSPs, namely PSR J0024−7204J, PSR J1431−4715, and PSR J1959+2048, consistent with previous studies of other BW MSPs. We estimated orbital-phase-de

APA, Harvard, Vancouver, ISO, and other styles

14

Ahuir, Jérémy, Antoine Strugarek, Allan Sacha Brun, et al. "Could star-planet magnetic interactions lead to planet migration and influence stellar rotation?" Proceedings of the International Astronomical Union 15, S354 (2019): 295–99. http://dx.doi.org/10.1017/s1743921319009992.

Full text

Abstract:

AbstractThe distribution of hot Jupiters, for which star-planet interactions can be significant, questions the evolution of exosystems. We aim to follow the orbital evolution of a planet along the rotational and structural evolution of the host star by taking into account the coupled effects of tidal and magnetic torques from ab initio prescriptions. It allows us to better understand the evolution of star-planet systems and to explain some properties of the distribution of observed close-in planets. To this end we use a numerical model of a coplanar circular star-planet system taking into acco

APA, Harvard, Vancouver, ISO, and other styles

15

Meyer, Alex J., Oscar Fuentes-Muñoz, Ioannis Gkolias, et al. "An Earth Encounter as the Cause of Chaotic Dynamics in Binary Asteroid (35107) 1991VH." Planetary Science Journal 5, no. 8 (2024): 179. http://dx.doi.org/10.3847/psj/ad6605.

Full text

Abstract:

Abstract Among binary asteroids, (35107) 1991VH stands out as unique given the likely chaotic rotation within its secondary component. The source of this excited dynamical state is unknown. In this work, we demonstrate that a past close encounter with Earth could have provided the necessary perturbation to allow the natural internal dynamics, characterized by spin–orbit coupling, to evolve the system into its current dynamical state. In this hypothesis, the secondary of 1991VH was previously in a classical 1:1 spin–orbit resonance with an orbit period likely between 28 and 35 hr before being p

APA, Harvard, Vancouver, ISO, and other styles

16

Makarov, Valeri V., and Alexey Goldin. "Chaotic Capture of a Retrograde Moon by Venus and the Reversal of Its Spin." Universe 10, no. 1 (2023): 15. http://dx.doi.org/10.3390/universe10010015.

Full text

Abstract:

Planets are surrounded by fractal surfaces (traditionally called Hill spheres), separating the inner zones of long-term stable orbital motion of their satellites from the outer space where the gravitational pull from the Sun takes over. Through this surface, external minor bodies in trajectories loosely co-orbital to a planet can be stochastically captured by the planet without any assistance from external perturbative forces, and can become moons chaotically orbiting the planet for extended periods of time. Using state-of-the-art orbital integrators, we simulate such capture events for Venus,

APA, Harvard, Vancouver, ISO, and other styles

17

Pogonin, Alexander E., Ivan Yu Kurochkin, Alexey V. Eroshin, Maksim N. Zavalishin, and Yuriy A. Zhabanov. "Comprehensive Study of Equilibrium Structure of Trans-Azobenzene: Gas Electron Diffraction and Quantum Chemical Calculations." Physchem 4, no. 2 (2024): 131–46. http://dx.doi.org/10.3390/physchem4020010.

Full text

Abstract:

The geometrical re parameters of trans-azobenzene (E-AB) free molecule were refined by gas electron diffraction (GED) method using available experimental data obtained previously by S. Konaka and coworkers. Structural analysis was carried out by various techniques. First of all, these included the widely used molecular orbital constrained gas electron diffraction method and regularization method. The results of the refinements using different models were also compared—a semirigid model, three variants of one-dimensional dynamic models, and a two-dimensional pseudoconformer model. Several descr

APA, Harvard, Vancouver, ISO, and other styles

18

Ivanova, G. A., and V. S. Khoroshilov. "On control of spacecraft orientation to the ground data acquisition station." Kosmičeskaâ tehnika. Raketnoe vooruženie 2023, no. 1 (2023): 41–47. http://dx.doi.org/10.33136/stma2023.01.041.

Full text

Abstract:

The article dwells on the spacecraft attitude control to point the onboard antenna to the ground data acquisition station during the communication session. Antenna is fixed relative to the spacecraft body. Pur-pose of the antenna is to receive the flight task aboard the spacecraft and to downlink the telemetry infor-mation. When orbiting, the spacecraft position relative to the ground data acquisition station changes contin-uously. It is due to the diurnal rotation of the Earth, spacecraft orbital motion and angular motion of the spacecraft relative to the center of mass under the impact of th

APA, Harvard, Vancouver, ISO, and other styles

19

Modesto, Leonardo, Tian Zhou, and Qiang Li. "Geometric Origin of the Galaxies’ Dark Side." Universe 10, no. 1 (2023): 19. http://dx.doi.org/10.3390/universe10010019.

Full text

Abstract:

We show that Einstein’s conformal gravity can explain, simply, and on the geometric ground, galactic rotation curves, without the need to introduce any modification in both the gravitational as well as in the matter sector of the theory. The geometry of each galaxy is described by a metric obtained, making a singular rescaling of Schwarzschild’s spacetime. The new exact solution, asymptotically anti-de Sitter, manifests an unattainable singularity at infinity that cannot be reached in finite proper time; namely, the spacetime is geodetically complete. It deserves to be noticed that, in this pa

APA, Harvard, Vancouver, ISO, and other styles

20

Tassiopoulou, Styliani, Georgia Koukiou, and Vassilis Anastassopoulos. "Revealing Coupled Periodicities in Sunspot Time Series Using Bispectrum—An Inverse Problem." Applied Sciences 14, no. 3 (2024): 1318. http://dx.doi.org/10.3390/app14031318.

Full text

Abstract:

Sunspot daily time series have been available for almost two centuries providing vast and complicated information about the behavior of our star and especially the interaction of the motion of the planets and other possible interstellar phenomena and their effects on the surface of the Sun. The main result obtained from the sunspot time series analysis is the imprint of various periodicities, such as the planets’ orbital periods and the planetary synodic periods on the sunspots signature. A detailed spectrum representation is achieved by means of a periodogram and a virtual extension of the ti

APA, Harvard, Vancouver, ISO, and other styles

21

Zhang 张, Jingwen 婧雯, Lauren M. Weiss, Daniel Huber, et al. "Discovery of a Jupiter Analog Misaligned to the Inner Planetary System in HD 73344." Astronomical Journal 169, no. 4 (2025): 200. https://doi.org/10.3847/1538-3881/ada60a.

Full text

Abstract:

Abstract We present the discovery of a Jupiter-like planet, HD 73344 d ( m d = 2.5 5 − 0.46 + 0.56 M J , a d = 6.7 0 − 0.26 + 0.25 au, e d = 0.1 8 − 0.12 + 0.14 ) based on 27 yr radial velocity (RV) observations from ELODIE, Lick/Hamilton, SOPHIE, APF, and HIRES. HD 73344 also hosts a compact inner planetary system, including a transiting sub-Neptune, HD 73344 b (P b = 15.61 days, r b = 2.8 8 − 0.07 + 0.08 R ⊕ ), and a nontransiting Saturn-mass planet (P c = 65.936 days, m c sin i c = 0.36 7 − 0.021 + 0.022 M J ). By analyzing TESS light curves, we identified a stellar rotation period of 9.03

APA, Harvard, Vancouver, ISO, and other styles

22

Idini, Benjamin, and David J. Stevenson. "The Lost Meaning of Jupiter’s High-degree Love Numbers." Planetary Science Journal 3, no. 1 (2022): 11. http://dx.doi.org/10.3847/psj/ac4248.

Full text

Abstract:

Abstract NASA’s Juno mission recently reported Jupiter’s high-degree (degree ℓ, azimuthal order m = 4, 2) Love number k 42 = 1.289 ± 0.063 (1σ), an order of magnitude above the hydrostatic k 42 obtained in a nonrotating Jupiter model. After numerically modeling rotation, the hydrostatic k 42 = 1.743 ± 0.002 is still 7σ away from the observation, raising doubts about our understanding of Jupiter’s tidal response. Here, we use first-order perturbation theory to explain the hydrostatic k 42 result analytically. We use a simple Jupiter equation of state (n = 1 polytrope) to obtain the fractional c

APA, Harvard, Vancouver, ISO, and other styles

23

Mbarki, Mohammed, Marc Oettinghaus, and Gerhard Raabe. "Quantum-chemical Ab Initio Calculations on the Donor–Acceptor Complex Pyridine–Borabenzene (C5H5N–BC5H5)." Australian Journal of Chemistry 67, no. 2 (2014): 266. http://dx.doi.org/10.1071/ch13407.

Full text

Abstract:

The adduct of borabenzene (C5H5B) and pyridine (C5H5N) was studied by means of quantum-chemical ab initio and time-dependent density functional theory calculations at different levels of theory. In the fully optimized structure (MP2/6-311++G**) of the free donor–acceptor complex (C2), the C–B–C angle amounts to 120.6°. The planes of the two aromatic rings enclose a torsion angle of ~40° with a barrier to rotation about the B–N bond of less than 3 kcal mol–1 (1 kcal mol–1 = 4.186 kJ mol–1). The highest computational level applied in this study (complete basis set limit, coupled cluster with sin

APA, Harvard, Vancouver, ISO, and other styles

24

Mbarki, M., M. Oettinghaus, and G. Raabe. "Corrigendum to: Quantum-chemical Ab Initio Calculations on the Donor–Acceptor Complex Pyridine–Borabenzene (C5H5N–BC5H5)." Australian Journal of Chemistry 69, no. 5 (2016): 583. http://dx.doi.org/10.1071/ch13407_co.

Full text

Abstract:

The adduct of borabenzene (C5H5B) and pyridine (C5H5N) was studied by means of quantum-chemical ab initio and time-dependent density functional theory calculations at different levels of theory. In the fully optimized structure (MP2/6-311++G**) of the free donor–acceptor complex (C2), the C–B–C angle amounts to 120.6°. The planes of the two aromatic rings enclose a torsion angle of ~40° with a barrier to rotation about the B–N bond of less than 3kcalmol–1 (1kcalmol–1=4.186kJmol–1). The highest computational level applied in this study (complete basis set limit, coupled cluster with single and

APA, Harvard, Vancouver, ISO, and other styles

25

Berdeu, Anthony, Maud Langlois, and Frédéric Vachier. "First observation of a quadruple asteroid." Astronomy & Astrophysics 658 (February 2022): L4. http://dx.doi.org/10.1051/0004-6361/202142623.

Full text

Abstract:

Context. Extreme adaptive optics systems, such as the Spectro-Polarimetric High-contrast Exoplanet REsearch facility (SPHERE), push forward the limits in high contrast and high resolution in direct imaging. The main objectives of these instruments are exoplanet detection and characterisation. Aims. We aim to increase the contrast limits to detect new satellites orbiting known asteroids. We use cutting-edge data reduction techniques and data processing algorithms that are essential to best analyse the raw data provided by the instruments and increase their performances. Doing so, the unequalled

APA, Harvard, Vancouver, ISO, and other styles

26

Heller, René. "Formation of hot Jupiters through disk migration and evolving stellar tides." Astronomy & Astrophysics 628 (August 2019): A42. http://dx.doi.org/10.1051/0004-6361/201833486.

Full text

Abstract:

Since the discovery of Jupiter-sized planets in extremely close orbits around Sun-like stars, several mechanisms have been proposed to produce these “hot Jupiters”. Here we address their pile-up at 0.05 AU observed in stellar radial velocity surveys, their long-term orbital stability in the presence of stellar tides, and their occurrence rate of 1.2 ± 0.38% in one framework. We calculate the combined torques on the planet from the stellar dynamical tide and from the protoplanetary disk in the type-II migration regime. The disk is modeled as a 2D nonisothermal viscous disk parameterized to repr

APA, Harvard, Vancouver, ISO, and other styles

27

Richardson, Noel D., Gail H. Schaefer, Jan J. Eldridge, et al. "Visual Orbits of Wolf–Rayet Stars. I. The Orbit of the Dust-producing Wolf–Rayet Binary WR 137 Measured with the CHARA Array." Astrophysical Journal 977, no. 1 (2024): 78. https://doi.org/10.3847/1538-4357/ad8d5c.

Full text

Abstract:

Abstract Classical Wolf–Rayet (W-R) stars are the descendants of massive OB stars that have lost their hydrogen envelopes and are burning helium in their cores prior to exploding as Type Ib/c supernovae. The mechanisms for losing their hydrogen envelopes are either through binary interactions or through strong stellar winds potentially coupled with episodic mass loss. Among the bright classical W-R stars, the binary system WR 137 (HD 192641; WC7d + O9e) is the subject of this paper. This binary is known to have a 13 yr period and produces dust near periastron. Here we report on interferometry

APA, Harvard, Vancouver, ISO, and other styles

28

Noack, L., K. G. Kislyakova, C. P. Johnstone, M. Güdel, and L. Fossati. "Interior heating and outgassing of Proxima Centauri b: Identifying critical parameters." Astronomy & Astrophysics 651 (July 2021): A103. http://dx.doi.org/10.1051/0004-6361/202040176.

Full text

Abstract:

Context. Since the discovery of a potentially low-mass exoplanet around our nearest neighbour star Proxima Centauri, several works have investigated the likelihood of a shielding atmosphere and therefore the potential surface habitability of Proxima Cen b. However, outgassing processes are influenced by several different (unknown) factors such as the actual planet mass, mantle and core composition, and different heating mechanisms in the interior. Aims. We aim to identify the critical parameters that influence the mantle and surface evolution of the planet over time, as well as to potentially

APA, Harvard, Vancouver, ISO, and other styles

29

Ma 马, Linhao 林昊, and Jim Fuller. "Tidal Spin-up of Subdwarf B Stars." Astrophysical Journal 975, no. 1 (2024): 1. http://dx.doi.org/10.3847/1538-4357/ad7788.

Full text

Abstract:

Abstract Hot subdwarf B (sdB) stars are stripped helium-burning stars that are often found in close binaries, where they experience strong tidal interactions. The dissipation of tidally excited gravity waves alters their rotational evolution throughout the sdB lifetime. While many sdB binaries have well-measured rotational and orbital frequencies, there have been few theoretical efforts to accurately calculate the tidal torque produced by gravity waves. In this work, we directly calculate the tidal excitation of internal gravity waves in realistic sdB stellar models and integrate the coupled s

APA, Harvard, Vancouver, ISO, and other styles

30

Casaretto, Nicolas, Sébastien Pillet, El-Eulmi Bendeif, et al. "Photocrystallography and IR spectroscopy of light-induced linkage NO isomers in [RuBr(NO)2(PCyp3)2]BF4." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 71, no. 6 (2015): 788–97. http://dx.doi.org/10.1107/s2052520615018132.

Full text

Abstract:

One single photo-induced linkage NO isomer (PLI) is detected and characterized in the dinitrosyl pentacoordinated compound [RuBr(NO)2(PCyp3)2]BF4 by a combination of photocrystallographic and IR analysis. In the ground state, the molecule adopts a trigonal–bipyramidal structure with the two NO ligands almost linear with angles Ru—N1—O1 = 168.92 (16), Ru—N2—O2 = 166.64 (16)°, and exactly equal distances of Ru—N = 1.7838 (17) and O—N = 1.158 (2) Å. After light irradiation of 405 nm at T = 10 K, the angle of Ru—N2—O2 changes to 114.2 (6)° by rotation of the O atom towards the Br ligand with incre

APA, Harvard, Vancouver, ISO, and other styles

31

Liew, S., M. Poole, J. Kenton-Smith, S. Tan, and Barry L. Eppley. "Orbital and Globe Rotation." Journal of Craniofacial Surgery 10, no. 6 (1999): 526. http://dx.doi.org/10.1097/00001665-199911000-00013.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Jermyn, Adam S., Jamie Tayar, and Jim Fuller. "Differential rotation in convective envelopes: constraints from eclipsing binaries." Monthly Notices of the Royal Astronomical Society 491, no. 1 (2019): 690–707. http://dx.doi.org/10.1093/mnras/stz2983.

Full text

Abstract:

ABSTRACT Over time, tides synchronize the rotation periods of stars in a binary system to the orbital period. However, if the star exhibits differential rotation, then only a portion of it can rotate at the orbital period, so the rotation period at the surface may not match the orbital period. The difference between the rotation and orbital periods can therefore be used to infer the extent of the differential rotation. We use a simple parametrization of differential rotation in stars with convective envelopes in circular orbits to predict the difference between the surface rotation period and

APA, Harvard, Vancouver, ISO, and other styles

33

Luo, Jian Guo, and Mao Yan He. "Cubic Hybrid Mechanism Based on S[T] Output Base and P/R Input Base." Advanced Materials Research 430-432 (January 2012): 1725–28. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1725.

Full text

Abstract:

Based on the flexibility of single couple of serial mechanism and the stability of multi couples of parallel mechanism, a new type of S[T] output base of hybrid mechanism presented, component of sphere joint run through the tiger joint, this component still the output one with the capability of rotate in three dimensional space. Add serial branch including three translation couple P or/and rotation couple R to the new type of S[T] output base, put these members on one cubic frame, twenty seven configurations obtained with 3-DOF(degree of freedom) allow of three dimensional rotation, twenty sev

APA, Harvard, Vancouver, ISO, and other styles

34

Sbitnev, Valeriy. "Quaternion Algebra on 4D Superfluid Quantum Space-Time: Can Dark Matter Be a Manifestation of the Superfluid Ether?" Universe 7, no. 2 (2021): 32. http://dx.doi.org/10.3390/universe7020032.

Full text

Abstract:

Quaternions are a natural framework of 4D space-time, where the unit element relates to time, and three others relate to 3D space. We define a quaternion set of differential torsion operators (shifts with rotations) that act to the energy-momentum tensor written on the same quaternion basis. It results in the equations of gravity-torsion (gravitomagnetic) fields that are similar to Maxwell’s equations. These equations are parent equations, generating the following equations: (a) equations of the transverse gravity-torsion waves; (b) the vorticity equation describing vortices orbital speed of w

APA, Harvard, Vancouver, ISO, and other styles

35

Mennickent, R. E. "Long photometric cycles in hot algols." Serbian Astronomical Journal, no. 194 (2017): 1–21. http://dx.doi.org/10.2298/saj1794001m.

Full text

Abstract:

We summarize the development of the field of Double Periodic Variables (DPVs, Mennickent et al. 2003) during the last fourteen years, placing these objects in the context of intermediate-mass close interacting binaries similar to ? Persei (Algol) and ? Lyrae (Sheliak) which are generally called Algols. DPVs show enigmatic long photometric cycles lasting on average about 33 times the orbital period, and have physical properties resembling, in some aspects, ? Lyrae. About 200 of these objects have been found in the Galaxy and the Magellanic Clouds. Light curve models and orbitally resolved spect

APA, Harvard, Vancouver, ISO, and other styles

36

Mehta, C. B., and M. Singh. "Compressible Analysis of Bénard Convection of Magneto Rotatory Couple-Stress Fluid." International Journal of Applied Mechanics and Engineering 23, no. 1 (2018): 91–105. http://dx.doi.org/10.1515/ijame-2018-0006.

Full text

Abstract:

AbstractThermal Instability (Benard’s Convection) in the presence of uniform rotation and uniform magnetic field (separately) is studied. Using the linearized stability theory and normal mode analyses the dispersion relation is obtained in each case. In the case of rotatory Benard’s stationary convection compressibility and rotation postpone the onset of convection whereas the couple-stress have duel character onset of convection depending on rotation parameter. While in the absence of rotation couple-stress always postpones the onset of convection. On the other hand, magnetic field on thermal

APA, Harvard, Vancouver, ISO, and other styles

37

Verma, Anish, and Krzysztof Starosta. "Collective and single-particle degrees of freedom in rotating nuclei." Canadian Journal of Chemistry 96, no. 2 (2018): 158–67. http://dx.doi.org/10.1139/cjc-2017-0275.

Full text

Abstract:

In 1937, Hermann Jahn and Edward Teller published their research describing a mechanism of symmetry breaking in nonlinear polyatomic molecules resulting in a lifting of orbital degeneracy of an electronic state (Proc. R. Soc. London, Ser. A 1937, 161, 220), yielding insight into molecular structure. The impact of symmetry breaking on the energy and structure of quantum states is not unique to molecules and may be applied to nuclei, involving degenerate nucleon states as opposed to electronic states. Reinhard and Otten showed that the nuclear Jahn–Teller effect provides a mechanism applicable t

APA, Harvard, Vancouver, ISO, and other styles

38

Mehta, Chander Bhan. "Magneto-rotatory compressible couple-stress fluid heated from below in porous medium." Studia Geotechnica et Mechanica 38, no. 1 (2016): 55–63. http://dx.doi.org/10.1515/sgem-2016-0006.

Full text

Abstract:

Abstract The study is aimed at analysing thermal convection in a compressible couple stress fluid in a porous medium in the presence of rotation and magnetic field. After linearizing the relevant equations, the perturbation equations are analysed in terms of normal modes. A dispersion relation governing the effects of rotation, magnetic field, couple stress parameter and medium permeability have been examined. For a stationary convection, the rotation postpones the onset of convection in a couple stress fluid heated from below in a porous medium in the presence of a magnetic field. Whereas, th

APA, Harvard, Vancouver, ISO, and other styles

39

Rahul and Naveen Sharma. "On a Couple-Stress Rivlin-Ericksen Ferromagnetic Fluid Heated from Below with Varying Gravity, Rotation, Magnetic Field and Suspended Particles Flowing Through a Porous Medium." International Journal of Applied Mechanics and Engineering 27, no. 2 (2022): 177–98. http://dx.doi.org/10.2478/ijame-2022-0027.

Full text

Abstract:

Abstract The thermal instability of a couple-stress Rivlin-Ericksen ferromagnetic fluid with varying gravity field, suspended particles, rotation and magnetic field flowing through a porous medium is investigated. The dispersion relation has been developed and solved analytically using the normal mode approach and linear stability theory. The effect of suspended particles, rotation, couple stress, permeability and magnetic field on the fluid layer has been investigated. For stationary conventions, it is found that suspended particles always have a destabilizing effect for λ>0 and a stabiliz

APA, Harvard, Vancouver, ISO, and other styles

40

Fernandes, Rafael M., and Jörn W. F. Venderbos. "Nematicity with a twist: Rotational symmetry breaking in a moiré superlattice." Science Advances 6, no. 32 (2020): eaba8834. http://dx.doi.org/10.1126/sciadv.aba8834.

Full text

Abstract:

Motivated by recent reports of nematic order in twisted bilayer graphene (TBG), we investigate the impact of the triangular moiré superlattice degrees of freedom on nematicity. In TBG, the nematic order parameter is not Ising like, as in tetragonal crystals, but has a three-state Potts character related to the threefold rotational symmetry (C3z) of the moiré superlattice. We find that, even in the presence of static strain that explicitly breaks the C3z symmetry, the system can still undergo a nematic-flop phase transition that spontaneously breaks in-plane twofold rotations. Moreover, elastic

APA, Harvard, Vancouver, ISO, and other styles

41

Kumar, Pardeep. "Magneto-Rotatory Convection in Couple-Stress Fluid." WSEAS TRANSACTIONS ON FLUID MECHANICS 18 (October 6, 2023): 58–65. http://dx.doi.org/10.37394/232013.2023.18.6.

Full text

Abstract:

Background: Thermal convection is the most convective instability when crystals are produced from a single element like silicon and the thermal instability of a fluid layer heated from below plays an important role in geophysics, oceanography, atmospheric physics, etc. The flow through porous media is of considerable interest for petroleum engineers, for geophysical fluid dynamicists and has importance in chemical technology and industry. Many of the flow problems in fluids with couple-stresses indicate some possible experiments, that could be used for determining the material constants, and t

APA, Harvard, Vancouver, ISO, and other styles

42

Zoghbi, Jean-Paul A. "Quantization of Planetary Systems and its Dependency on Stellar Rotation." Publications of the Astronomical Society of Australia 28, no. 3 (2011): 177–201. http://dx.doi.org/10.1071/as09062.

Full text

Abstract:

AbstractWith the discovery of now more than 500 exoplanets, we present a statistical analysis of the planetary orbital periods and their relationship to the rotation periods of their parent stars. We test whether the structural variables of planetary orbits, i.e. planetary angular momentum and orbital period, are ‘quantized’ in integer or half-integer multiples of the parent star's rotation period. The Solar System is first shown to exhibit quantized planetary orbits that correlate with the Sun's rotation period. The analysis is then expanded over 443 exoplanets to statistically validate this

APA, Harvard, Vancouver, ISO, and other styles

43

Pan, Qiaoyun, Weiyu Lv, Li Deng, Sumei Huang, and Aixi Chen. "Cooling a Rotating Mirror Coupled to a Single Laguerre–Gaussian Cavity Mode Using Parametric Interactions." Nanomaterials 12, no. 20 (2022): 3701. http://dx.doi.org/10.3390/nano12203701.

Full text

Abstract:

We study the cooling of a rotating mirror coupled to a Laguerre–Gaussian (L–G) cavity mode, which is assisted by an optical parametric amplifier (OPA). It is shown that the presence of the OPA can significantly lower the temperature of the rotating mirror, which is very critical in the application of quantum physics. We also find that the increase in angular momentum has an influence on the cooling of the rotating mirror. Our results may provide a potential application in the determination of the orbital angular momentum of light fields and precision measurement.

APA, Harvard, Vancouver, ISO, and other styles

44

Kumar, Pardeep, Roshan Lal, and Poonam Sharma. "Effect Of Rotation On Thermal Instability In Couple-Stress Elastico-Viscous Fluid." Zeitschrift für Naturforschung A 59, no. 7-8 (2004): 407–11. http://dx.doi.org/10.1515/zna-2004-7-803.

Full text

Abstract:

The thermal instability of a layer of a couple-stress fluid acted on by a uniform rotation is considered. Following the linearized stability theory and normal mode analysis, the dispersion relation is obtained. For stationary convection it is found that rotation has a stabilizing effect, whereas the couple-stress has both stabilizing and destabilizing effects. It is found that the presence of rotation introduces oscillatory modes in the system. A sufficient condition for the non-existence of overstability is also obtained.

APA, Harvard, Vancouver, ISO, and other styles

45

Volostnikov, V. G. "Orbital angular momentum of the spiral beams." Computer Optics 43, no. 3 (2019): 504–6. http://dx.doi.org/10.18287/2412-6179-2019-43-3-504-506.

Full text

Abstract:

At first sight, any rotation generates some angular momentum (it is true for a solid body). But these characteristics (rotation and orbital angular momentum) are rather different for optics and mechanics. In optics there are the situation when the rotation is important. On the other hand, there are the cases where the nonzero orbital angular momentum is necessary. The main goal of this article is to investigate a relationship between a rotation under propagation of spiral beam and its angular momentum. It can be done the following conclusion: there is no any relation between rotation under pro

APA, Harvard, Vancouver, ISO, and other styles

46

Kagan, Yan Y. "Double-couple earthquake source: symmetry and rotation." Geophysical Journal International 194, no. 2 (2013): 1167–79. http://dx.doi.org/10.1093/gji/ggt156.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Kagan, Yan Y. "Simplified algorithms for calculating double-couple rotation." Geophysical Journal International 171, no. 1 (2007): 411–18. http://dx.doi.org/10.1111/j.1365-246x.2007.03538.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Schroeder, Paul. "Central Body Rotation Drives Orbital Revolutions." Journal of Geoscience and Environment Protection 06, no. 12 (2018): 70–84. http://dx.doi.org/10.4236/gep.2018.612005.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Kumar, Pardeep. "Stability Analysis in Couple-Stress Rotatory Fluid." WSEAS TRANSACTIONS ON HEAT AND MASS TRANSFER 16 (June 29, 2021): 49–58. http://dx.doi.org/10.37394/232012.2021.16.8.

Full text

Abstract:

The aim of the present research was to study the effect of uniform rotation on the layer of a couple-stress fluid heated from below in porous medium. Following the linearized stability theory, Boussinesq approximation and normal mode analysis, the dispersion relation is obtained. The stationary convection, stability of the system and oscillatory modes are discussed. For the case of stationary convection, it is found that rotation has a stabilizing effect, whereas the couple-stress parameter and medium permeability have both stabilizing and destabilizing effects on the system. It is found that

APA, Harvard, Vancouver, ISO, and other styles

50

Lanza, A. F. "Orbital period modulation in hot Jupiter systems." Monthly Notices of the Royal Astronomical Society 497, no. 3 (2020): 3911–24. http://dx.doi.org/10.1093/mnras/staa2186.

Full text

Abstract:

ABSTRACT We introduce a model for the orbital period modulation in systems with close-by giant planets based on a spin–orbit coupling that transfers angular momentum from the orbit to the rotation of the planet and vice versa. The coupling is produced by a permanent non-axisymmetric gravitational quadrupole moment assumed to be present in the solid core of the planet. We investigate two regimes of internal planetary rotation, that is, when the planet rotates rigidly and when the rotation of its deep interior is time-dependent as a consequence of a vacillating or intermittent convection in its

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!