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Journal articles on the topic 'Planetary Positions'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Xuejun, Li, Jiang Lingli, Hua Dengrong, Yin Daoxuan, and Yang Dalian. "An Analysis of the Gear Meshing Characteristics of the Main Planetary Gear Trains of Helicopters Undergoing Shafting Position Changes." International Journal of Aerospace Engineering 2021 (July 30, 2021): 1–12. http://dx.doi.org/10.1155/2021/9965818.

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The complex three-shaft three-reducer structural designs of helicopter transmission systems are prone to changes in the relative positions of shafting under the conditions of main rotor and tail rotor loads. These changes will affect the transmission characteristics of the entire transmission system. In this study, the planetary gear trains of helicopters were examined. Due to the fact that these structures are considered to be the most representative structures of the main reducers of helicopters, they were selected as the study objects for the purpose of examining the meshing characteristics

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2

Ciyuan, Liu. "Ancient Chinese observations of planetary positions and a table of planetary occultations." Earth, Moon and Planets 40, no. 2 (1988): 111–17. http://dx.doi.org/10.1007/bf00056020.

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Arlot, J. E., A. Bec-Borsenberger, and G. Dourneau. "Observations of the Planetary Satellites Europa and Titan by Hipparcos." International Astronomical Union Colloquium 127 (1991): 206–9. http://dx.doi.org/10.1017/s0252921100063776.

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AbstractObservations of the satellites Europa and Titan will be obtained from the European Astrometric Satellite HIPPARCOS. These observations will be used to obtain “observed” positions of the planets Jupiter and Saturn; these positions have the advantages, first to be given in the reference frame defined by the Hipparcos system, and second, the accuracy on these positions is better than the accuracy of the ground-based observations of these planets. To obtain the positions of the planets from those of their satellites, we have to take the calculated positions of these satellites by means of

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Chabás, José, and Bernard R. Goldstein. "Computing Planetary Positions: User-Friendliness and the Alfonsine Corpus." Journal for the History of Astronomy 44, no. 3 (2013): 257–76. http://dx.doi.org/10.1177/002182861304400302.

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Magrini, L., A. Cardwell, R. L. M. Corradi, A. Mampaso, and M. Perinotto. "Accurate positions of candidate planetary nebulae in M 33." Astronomy & Astrophysics 367, no. 2 (2001): 498–500. http://dx.doi.org/10.1051/0004-6361:20010044.

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Tang, K., Y. Z. Song, K. X. Shen, et al. "The orbit of Triton with new precise observations and the INPOP19a ephemeris." Astronomy & Astrophysics 641 (September 2020): A108. http://dx.doi.org/10.1051/0004-6361/202038556.

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Aims. The Gaia catalogue brings new opportunities and challenges to high-precision astronomy and astrometry. The precision of data reduction is therefore improved by a large number of reference stars with high-precision positions and proper motions. Numerous precise positions for Triton are obtained from the latest observations using the Gaia catalogue. Furthermore, the new INPOP19a planetary ephemeris, which also fits the observations from the Gaia Data Release 2, has recently become available. In this paper, a new orbit of Triton is calculated using the latest precise charge-coupled device (

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7

Brannon, James. "Plato and planetary order: Uncertainty in the positions of Mercury and Venus." Journal for the History of Astronomy 54, no. 4 (2023): 404–24. http://dx.doi.org/10.1177/00218286231203198.

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In Plato’s Republic and Timaeus, and in the pseudo-Platonic Epinomis, the author(s) discuss the planetary order for the Moon, Sun, and planets. Based on these works, many ancient, medieval, and modern authors assert without explanation that Plato’s order for the first four planets is Moon-Sun-Venus-Mercury. While this order may have been Plato’s intention, this article presents a differing opinion by claiming that Plato’s words lack sufficient clarity for a reader to understand Plato’s order for Mercury and Venus. This claim has a three-fold basis: (1) Plato’s difficult to understand planetary

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Schmidt, Mirosław, and Romuald Tylenda. "Spectroscopic Masses for post-AGB Stars and Planetary Nebula Nuclei." Symposium - International Astronomical Union 209 (2003): 241–42. http://dx.doi.org/10.1017/s0074180900208619.

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We compare the observed positions of post-AGB stars and planetary nebula nuclei in the log g and Teff diagram. We show that these positions and the resulting stellar masses are not fully consistent with theoretical expectations.

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Barker, T. "The Ionization Structure of Planetary Nebulae." Symposium - International Astronomical Union 155 (1993): 181. http://dx.doi.org/10.1017/s0074180900170433.

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Javaraiah, J. "Long-term variations in solar activity and planetary configurations." Proceedings of the International Astronomical Union 13, S340 (2018): 263–64. http://dx.doi.org/10.1017/s1743921318001321.

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AbstractWe have analyzed the data on yearly mean international sunspot number (RZ) during the period 1610 – 2015 and orbital positions (ecliptic longitudes) of the giant planets in each 10-day interval during the period 1600 – 2099. We determined mean absolute difference ($\overline{\psi _D}$) of the orbital positions of the giant planets in each interval. We find that there exits a good correlation between cycle amplitude (RM, i.e. the maximum value of RZ) and the value of $\overline{\psi _D}$ at cycle maximum, suggesting that on longer time scales low/high solar activity associated with less

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11

Zhang, Mian, Kesheng Wang, and Yaxin Li. "Motion Periods of Planet Gear Fault Meshing Behavior." Sensors 18, no. 11 (2018): 3802. http://dx.doi.org/10.3390/s18113802.

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Vibration sensors are, generally, fixed on the housing of planetary gearboxes for vibration monitoring. When a local fault occurred on the tooth of a planet gear, along with the system operating, the faulty tooth will mesh with the ring gear or sun gear at different positions referring to the fixed sensor. With consideration of the attenuation effect, the amplitudes of the fault-induced vibrations will be time-varying due to the time-varying transfer paths. These variations in signals are valuable information to identify the fault existence as well as the severity and types. However, the fault

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12

Zeng, Qingliang, Shoubo Jiang, Lirong Wan, and Xueyi Li. "Finite element modeling and analysis of planetary gear transmission based on transient meshing properties." International Journal of Modeling, Simulation, and Scientific Computing 06, no. 03 (2015): 1550035. http://dx.doi.org/10.1142/s179396231550035x.

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Planetary gear trains are widely applied in various transmission units. Whether strengths of all gears are accurately calculated or not can affect reliability of the entire system significantly. Strength calculation method for planetary gear trains usually follows the method for cylindrical gears, in which the worst meshing positions for both contact stress and bending stress cannot be determined precisely, and calculation results tend to be conservative. To overcome these shortcomings, a kinematics analysis for a planetary gear train is firstly performed, in which the influence of relative sp

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Volkov, Gleb, Denis Fadyushin, and Maksim Vedernikov. "Geometric calculation of non-circular gear segments of the planetary mechanism in rotary hydraulic machines." E3S Web of Conferences 389 (2023): 01017. http://dx.doi.org/10.1051/e3sconf/202338901017.

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The article discusses the improvement of the methods of geometric design of positive-displacement hydraulic machines with floating satellites. At the first stage, based on standard methods, an “average” round-link planetary mechanism, having the number of teeth as in the designed hydraulic machine, is calculated. At the second stage, the same-type cyclic functions characterizing the paths of the center of the satellite in the coordinates associated with each of the central gearwheels are specified. At the third stage, the coordinate arrays of the satellite in a variety of its positions are cal

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Kundu, Arunima. "Mediating otherness: The Afrofuturist planetary posthuman in Black Panther." European Journal of American Culture 43, no. 3 (2024): 257–69. https://doi.org/10.1386/ejac_00126_1.

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Literature and film, as forms of cultural production, have consistently participated in public discourses by raising valuable questions pertinent to contemporary historical and cultural moments. Science fiction film and literature, particularly in the 2010s, have tackled cultural discourse on the human condition by thematically addressing human relationships with technology and articulating complex theoretical discussions in a way that translates into popular culture. This article brings the theoretical concepts of planetarity and the posthuman together in dialogue to conceptualize a planetary

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Kahraman, A. "Planetary Gear Train Dynamics." Journal of Mechanical Design 116, no. 3 (1994): 713–20. http://dx.doi.org/10.1115/1.2919441.

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A model to simulate the dynamic behavior of a single-stage planetary gear train with helical gears is developed. The three-dimensional dynamic model includes all six rigid body motions of the gears and the carrier. The generic nature of the formulation allows the analysis of a planetary gear set with any number of planets. Planets can be arbitrarily spaced (equally or unequally) around the sun gear. The model is also capable of handling different planet meshing conditions which are functions of number of gear teeth and planet positions. The linear time-invariant equations of motion are solved

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Xu, Xiangyang, Tianhong Luo, Jiayuan Luo, Xia Hua, and Reza Langari. "Dynamical load sharing behaviors of heavy load planetary gear system with multi-floating components." International Journal of Modeling, Simulation, and Scientific Computing 09, no. 01 (2018): 1850005. http://dx.doi.org/10.1142/s1793962318500058.

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To investigate the dynamical load sharing behaviors of multi-floating components in the heavy load planetary gear system, a multi-floating planetary gear system that includes a floating central component and a quasi-floating planet flexible supporting pin is employed. Then a 21 degree of freedom lumped parameters dynamical model of this system is presented to study the dynamical load sharing behaviors. Some influencing factors, such as supporting stiffness, positions error of sun or carrier, and external input load are analyzed on the dynamical load sharing of the planetary gear system with mu

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Sharaban, Jurij, Vladimir Matusevich, and Aleksandr Shehov. "OBJECTIVE FUNCTION OF PARAMETRIC OPTIMIZATION OF THE SPEED OF A CLOSED PLANETARY MECHANISM FORMED BY TWO SIMPLE JAMES PLANETARY MECHANISMS." Bulletin of the National Technical University «KhPI» Series: Engineering and CAD, no. 2 (December 28, 2022): 41–52. http://dx.doi.org/10.20998/2079-0775.2022.2.05.

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The results of building а mathematical model of estimation the speed of the designed construction of the closed planetary mechanism formed from two simple planetary mechanisms of James are presented. The speed of the designed construction of the mechanism is estimated by the value of the equivalent moment of inertia of the mechanism links reduced to its input shaft. A model is a dimensionless function (analogue the equivalent moment of inertia) of two variables - transmission relations of simple planetary mechanisms, and set of numerical parameters. The parameters take into account the values

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18

Li, G. Y., H. B. Zhao, Y. Xia, F. Zeng, and Y. J. Luo. "PMOE planetary/lunar ephemeris framework." Proceedings of the International Astronomical Union 3, S248 (2007): 560–62. http://dx.doi.org/10.1017/s1743921308020140.

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AbstractThe PMOE planetary/lunar ephemeris framework was established in 2003, and has been improved in recent years. In the framework of the post-Newtonian effects, the figure perturbation effects arising from the a finite size of the Sun, Moon and the Earth, and the effect of the Earth tide were taken into account. The accuracy of using the PMOE ephemeris to predict the positions of the planets in the solar system are the same as that of JPL DE 405. Based on this framework, the orbit optimization for the LISA, ASTROD and ASTROD I missions, and the computation of celestial phenomena and lunar

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Manteiga, Minia, Carlos Dafonte, Marco A. Álvarez, Daniel Garabato, Ana Ulla, and Carme Jordi. "Gaia and the Planetary Nebulae." Proceedings of the International Astronomical Union 12, S323 (2016): 305–8. http://dx.doi.org/10.1017/s1743921317002137.

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AbstractAbout three years after Gaia was set into orbit, the first release of Gaia data, DR1, has been published by ESA and DPAC. Gaia’s first archive contains the results from the analysis of the initial 14 months of mission data. Outstandingly, it includes TGAS, Gaia-Tycho2 astrometric solution for about 2 million stars up to visible magnitude around 11.5.In addition to the five parameter astrometric solution for the sky (positions, parallaxes and proper motions), future Gaia data releases will provide the spectral energy distributions from 330-1050 nm, together with radial velocities, for s

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Desmars, J., E. Meza, B. Sicardy, et al. "Pluto’s ephemeris from ground-based stellar occultations (1988–2016)." Astronomy & Astrophysics 625 (May 2019): A43. http://dx.doi.org/10.1051/0004-6361/201834958.

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Context. From 1988 to 2016, several stellar occultations have been observed to characterise Pluto’s atmosphere and its evolution. From each stellar occultation, an accurate astrometric position of Pluto at the observation epoch is derived. These positions mainly depend on the position of the occulted star and the precision of the timing. Aims. We present 19 Pluto’s astrometric positions derived from occultations from 1988 to 2016. Using Gaia DR2 for the positions of the occulted stars, the accuracy of these positions is estimated at 2−10 mas, depending on the observation circumstances. From th

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Sloan, G. C. "Dust in planetary nebulae." Proceedings of the International Astronomical Union 12, S323 (2016): 121–27. http://dx.doi.org/10.1017/s1743921317002034.

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AbstractInfrared spectra from the Spitzer Space Telescope trace the evolution of carbon-rich dust from the asymptotic giant branch (AGB) to young planetary nebulae (PNe). On the AGB, amorphous carbon dominates the dust, but SiC and MgS also appear. In more evolved systems with warmer central stars, the spectra reveal the unidentified 21 μm feature, features from aliphatic hydrocarbons, and spectra from polycyclic aromatic hydrocarbons (PAHs), often with shifted feature positions indicative of the presence of aliphatics. More evolved systems with hot central stars show more typical PAH spectra,

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22

Sun, Liang, Yuzhu Zhou, Hengmin Huang, Chuanyu Wu, and Guofeng Zhang. "Analysis and Design of a Spatial Planetary Noncircular Gear Train for Rice Seedling Transplanting Based on Three Given Positions." Transactions of the ASABE 63, no. 1 (2020): 165–76. http://dx.doi.org/10.13031/trans.13498.

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HighlightsA method for solving a spatial transplanting mechanism with noncircular gears is proposed.A new mechanism for transplanting rice pot seedlings is proposed.A trajectory with a small lateral displacement at the preparation phase is obtained.The working performance is validated by simulations and field tests.Abstract. This study proposes a method of solving the parameters of a spatial planetary gear train with noncircular gears to meet the requirements of wide-narrow row pot seedling transplanting (WPST). First, the planetary gear train was simplified to a spatial open-chain 2R mechanis

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Durneva, E. A., and O. G. Chkhetiani. "PLANETARY UPPER-LEVEL FRONTAL ZONE IN THE EURO-ATLANTIC SECTOR IN SUMMER DURING 1990-2019." Meteorologiya i Gidrologiya, no. 6 (June 2021): 24–33. http://dx.doi.org/10.52002/0130-2906-2021-6-24-33.

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The analysis of monthly mean locations of the planetary upper-level frontal zone in the Euro-Atlantic sector in summer during 1990-2019 is presented. Specific positions for the summer months (June, July, and August) are noted and maximum northward displacements from the climatological normal for 1961-1990 are found in the years with the formation of the atmospheric blocking. The values of standard deviations of the displacements relative to the normal position were calculated for the summer period of each year both for the North Atlantic, Europe, and the European part of Russia and for the Eur

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Sen, S. N. "Planetary Theories in Sanskrit Astronomical Texts." International Astronomical Union Colloquium 91 (1987): 113–24. http://dx.doi.org/10.1017/s0252921100105937.

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The origin and development of planetary theories in India are still imperfectly understood. It is generally believed that fullfledged planetary theories capable of predicting the true positions of the Sun, Moon and Star-planets appeared in India along with the emergence of the siddhāntic astronomical literature. Before this siddhāntic astronomy there had existed the Vedāṅga Jyotiṣa of Lagadha, prepared around circa 400 B.C. in the Sūtra period more or less on the basis of astronomical elements developed in the time of the Saṃhitās and the Brāhmaṇas. This Jyotiṣa propounded a luni-solar calenda

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Šamonil, Pavel, Barbora Šebková, Jan Douda, and Tomáš Vrška. "Role of position within the windthrow in forest floor chemistry in the flysch zone of the Carpathians." Canadian Journal of Forest Research 38, no. 6 (2008): 1646–60. http://dx.doi.org/10.1139/x08-004.

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A hypothesis was verified that forest floor chemistry varies according to position within the windthrow (mound, pit, or control). A parallel assessment was made of differences in the chemistry of horizons and their forms. A total number of 1720 windthrows were studied in the fir–beech primeval forest in the flysch zone of the Western Carpathians. A total of 100 samples were taken on three positions from the following horizons and their forms (in brackets): litter, fermented (amphigenous, zoogenous, or mycogenous), humification (unresolved, zoogenous, residues, or humic), and mineral. A random

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Pottasch, S. R., A. Mampaso, A. Manchado, and J. Menzies. "Hydrogen Deficient Planetary Nebulae: Preliminary Results." International Astronomical Union Colloquium 87 (1985): 359–65. http://dx.doi.org/10.1017/s0252921100090953.

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AbstractNew spectra of A78 and A58 at different positions in the nebulae are presented. An abundance gradient is found in A78, extending quite close to the center. Similarly the nebulous knot near the center of A58 has considerably higher heavy element abundances than the outer regions of this nebula. The ionization state is considerably lower in A58 than A78. In A78 most of the neon is in the form of Ne+3 and Ne+4, indicating that the standard ionization correction factor as used by Jacoby and Ford, is substantially in error. Finally, the very high infrared excesses found in this nebulae are

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Shangjun, Ma, Wu Guanyu, Zhang Jianxin, and Liu Geng. "Experimental Research on Static Stiffness of the Planetary Roller Screw Mechanism." MATEC Web of Conferences 306 (2020): 02002. http://dx.doi.org/10.1051/matecconf/202030602002.

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This paper investigates the static stiffness characteristics of the planetary roller screw mechanism (PRSM). Firstly, an analytical model of elastic deformation in the PRSM considering contact deformation, combined deformation of screw shaft and thread deformations is established. Then, an accuracy coefficient is introduced to take into account the effect of machining error and assembly error on elastic deformation. Secondly, the stiffness tests of the PRSM are performed under different loads and nut positions. Lastly, the correctness of the analytical results is verified via the comparison wi

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Kiracofe, Daniel R., and Robert G. Parker. "Structured Vibration Modes of General Compound Planetary Gear Systems." Journal of Vibration and Acoustics 129, no. 1 (2006): 1–16. http://dx.doi.org/10.1115/1.2345680.

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This paper extends previous analytical models of simple, single-stage planetary gears to compound, multi-stage planetary gears. This model is then used to investigate the structured vibration mode and natural frequency properties of compound planetary gears of general description, including those with equally spaced planets and diametrically opposed planet pairs. The well-defined cyclic structure of simple, single-stage planetary gears is shown to be preserved in compound, multi-stage planetary gears. The vibration modes are classified into rotational, translational, and planet modes and the u

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Fienga, A., A. Di Ruscio, L. Bernus, et al. "New constraints on the location of P9 obtained with the INPOP19a planetary ephemeris." Astronomy & Astrophysics 640 (July 28, 2020): A6. http://dx.doi.org/10.1051/0004-6361/202037919.

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Context. We used the new released INPOP19a planetary ephemerides benefiting from Jupiter-updated positions by the Juno mission and reanalyzed Cassini observations. Aims. We test possible locations of the unknown planet P9. To do this, we used the perturbations it produces on the orbits of the outer planets, more specifically, on the orbit of Saturn. Methods. Two statistical criteria were used to identify possible acceptable locations of P9 according to (i) the difference in planetary positions when P9 is included compared with the propagated covariance matrix, and (ii) the χ2 likelihood of pos

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Walsh, J. R., R. E. S. Clegg, and N. Ukita. "Observations of CO and HCN (J = 1−0) in NGC 2346 and NGC 7293 with the Nobeyama 45-m Telescope." Symposium - International Astronomical Union 131 (1989): 204. http://dx.doi.org/10.1017/s0074180900138148.

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Wang, Pei Yu, and Xuan Long Cai. "Vibrational Analysis of Planetary Gear Trains by Finite Element Method." Applied Mechanics and Materials 284-287 (January 2013): 1012–17. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.1012.

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Planetary gear trains produce several advantages, including high speed reduction, compactness, greater load sharing and higher torque to weight ratio, which are used widely in wind turbine, automobiles, robot and other applications. In some important transmission applications, the noise and vibration are key concerns in design. In this paper, a 3D dynamic contact and impact analysis model of planetary gear trains has been proposed. Tooth surface friction, backlash, tolerance of peg hole, and time-varying stiffness were considered in this dynamic model. The ANSYS / LS-DYNA were utilized to anal

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Conway, Philip R. "On the way to planet politics: from disciplinary demise to cosmopolitical coordination." International Relations 34, no. 2 (2019): 157–79. http://dx.doi.org/10.1177/0047117819879482.

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From climatic chaos to mass extinction, from ‘geoengineering’ to unprecedented urbanisation, world politics has, in recent decades, become inescapably planetary. Recent discussions concerning ‘Planet Politics’ are, therefore, timely. However, the debate, to date, has been limited by a number of conceptual and political problems. In particular, an apparent disinclination to address serious differences as regards the authority of natural scientific knowledge with respect to collective ontologies raises the question of what is truly political in planetary politics. Drawing on Gayatri Spivak’s con

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Hora, Joseph L., William B. Latter, and Lynne K. Deutsch. "A near-infrared spectral survey of Planetary Nebulae." Symposium - International Astronomical Union 180 (1997): 238. http://dx.doi.org/10.1017/s007418090013058x.

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We have completed a near-infrared spectral survey of more than 40 planetary nebulae (PN). The data were obtained using the KSPEC spectrometer on the University of Hawaii 2.2m telescope on Mauna Kea. KSPEC is a cross-dispersed spectrograph that provides simultaneous sampling of the 1.1–2.4 μm range at a resolution of approximately 700. We used a 1 × 7 arcsec slit and a slit-viewing camera with a second NICMOS3 detector operating in the K-band for positioning and tracking of the source. The survey sample consists of compact IR-bright PN with a range of ages and morphological classifications. For

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Zhou, Chi, Qi Wang, Liangjin Gui, and Zijie Fan. "A numerical method for calculating the misalignments of planetary gears." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, no. 10 (2018): 2624–36. http://dx.doi.org/10.1177/0954407018804114.

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Because misalignments derived from the deflections of transmission systems have significant effects on the load capacity of planetary gears, these misalignments should be accurately considered in the analysis of planetary gears. Here, we develop a new approach for misalignment calculations of cylindrical planetary gears. A nonlinear model of a planetary gear transmission system is built based on the finite element method and nonlinear bearing theory for misalignment calculations that can precisely simulate the structural characteristics and mechanical properties of a planetary gear system. The

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Taylor, K., and N. G. Douglas. "A New Technique for Characterising Planetary Nebulae in External Galaxies." International Astronomical Union Colloquium 149 (1995): 33–37. http://dx.doi.org/10.1017/s0252921100022648.

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AbstractPlanetary Nebulae are proving to be powerful tertiary distance indicators as well as sensitive probes of a galaxy’s velocity field and mass distribution. We present a new technique for determining the positions, luminosities and radial velocities of the PNe in an external galaxy which may enable a one-step measurement of all these parameters.

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Zhang, Mian, Ming J. Zuo, Dongdong Wei, Jie Liu, KeSheng Wang, and Yongshan Wang. "Motion periods of sun gear dynamic fault meshing positions in planetary gear systems." Measurement 162 (October 2020): 107897. http://dx.doi.org/10.1016/j.measurement.2020.107897.

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Karra, Jaganadha Rama Sastry. "Possibility for existence of astrological planetary positions as per Sage Valmiki-research analysis." International Journal of Jyotish Research 8, no. 1 (2023): 18–20. http://dx.doi.org/10.22271/24564427.2023.v8.i1a.146.

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Girard, T. M., Y. Li, W. F. Van Altena, et al. "Astrometry with the HST Planetary Camera." Symposium - International Astronomical Union 166 (1995): 101–6. http://dx.doi.org/10.1017/s0074180900227927.

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The astrometric capability of the Hubble Space Telescope Planetary Camera (WF/PC1) is investigated, motivated by a study of the internal velocity distribution of globular clusters. The astrometric accuracy of the HST PC will be determined ultimately by 1) the accuracy to which the aberrated images can be ‘centered’, and 2) the accuracy to which the distortions across the PC field can be modeled. A series of overlapping exposures of two clusters, NGC 6752 and M15, are utilized to examine these issues.We have made use of maximum-likelihood image reconstruction to address the first issue, with go

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Senchurin, L. P., M. A. Ivanova, and S. V. Cherenkova. "To the question of the power calculation of planetary cycloid transmissions." Transactions of the Krylov State Research Centre S-I, no. 1 (2021): 94–97. http://dx.doi.org/10.24937/2542-2324-2021-1-s-i-94-97.

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Along with the classic gearboxes, cycloid gearboxes, which are based on mechanical transmissions of the K-H-V and 2K-V types, are increasingly strong positions. Kinematic and force relations between the links are obtained for a two-stage planetary cycloid transmission of type 2K-V with off-centroid gearing.

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Nambrath, Priyamvada, та Venketeswara R. Pai. "Parahitakaraṇam : A medieval formulary manual in the Kerala vernacular for calculating planetary mean longitudes". Journal for the History of Astronomy 56, № 3 (2025): 332–49. https://doi.org/10.1177/00218286251346592.

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The Parahitakaraṇam is a fragmentary astronomical text of unknown authorship, existing only in a single palm-leaf manuscript whose date of composition is also uncertain. The text focuses its attention on one single step in the computation of planetary positions, that is, the calculation of planetary mean longitudes. Nevertheless, it presents several interesting issues. The text is also engaged in conversation with a canonical astronomical text of the Kerala genre, the Karaṇapaddhati . This paper provides a translation of the source text. Mathematical notes and worked examples are also provided

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Du, Chuanming, Geng Liu, Guan Qiao, Shangjun Ma, and Wei Cai. "Transient thermal analysis of standard planetary roller screw mechanism based on finite element method." Advances in Mechanical Engineering 10, no. 12 (2018): 168781401881230. http://dx.doi.org/10.1177/1687814018812305.

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The thermal behavior of the standard planetary roller screw mechanism needs to be investigated since the large amount of heat generated by the friction torque on multiple contact points during the transmission process. In this article, a simplified transmission system model of standard planetary roller screw mechanism is first established for the finite element analysis. Second, the friction torque of standard planetary roller screw mechanism is calculated and the boundary conditions of thermal analysis are deduced. Then, the transient thermal analysis of the standard planetary roller screw me

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Guo, Li, Yueqi Song, Zhen Yan, Liang Li, and Guangli Wang. "Linking Planetary Ephemeris Reference Frames to ICRF via Millisecond Pulsars." Universe 11, no. 2 (2025): 54. https://doi.org/10.3390/universe11020054.

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The positions of millisecond pulsars (MSPs) can be determined with sub-milliarcsecond (mas) accuracy using both Very Long Baseline Interferometry (VLBI) and timing, referenced to the International Celestial Reference Frame (ICRF) and planetary ephemerides frame, respectively, representing kinematic and dynamical reference frames. The two frames can be connected through observations of common celestial objects, MSPs observed with VLBI and timing. However, previous attempts to establish this connection were unreliable due to the limited number of MSPs observed by both techniques. Currently, 23 M

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Kornhuber, K., V. Petoukhov, D. Karoly, S. Petri, S. Rahmstorf, and D. Coumou. "Summertime Planetary Wave Resonance in the Northern and Southern Hemispheres." Journal of Climate 30, no. 16 (2017): 6133–50. http://dx.doi.org/10.1175/jcli-d-16-0703.1.

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Slow-moving planetary waves of high amplitudes are often associated with persistent surface weather conditions. This persistence can lead to extreme weather events with potentially serious implications for society and nature. Quasi-resonant amplification (QRA) of planetary waves has been proposed as a mechanism to generate high-amplitude hemisphere-wide patterns of wavenumbers 6–8 in the Northern Hemisphere (NH) summer. Here this mechanism is studied in both hemispheres. Analyzing 1979–2015 reanalysis data, evidence for QRA in the Southern Hemisphere (SH) is found for wavenumbers 4 and 5. It i

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Fu, Xiaojun, Geng Liu, Shangjun Ma, Ruiting Tong, and Teik C. Lim. "A Comprehensive Contact Analysis of Planetary Roller Screw Mechanism." Journal of Mechanical Design 139, no. 1 (2016). http://dx.doi.org/10.1115/1.4034580.

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A comprehensive contact analysis model to determine the contact positions and clearances of mating thread surfaces in the planetary roller screw mechanism (PRSM) is proposed in this paper. By introducing a three-dimensional clearance vector, the modified conditions of continuous tangency of mating surfaces are established, in which the clearances along all the directions and contact positions of an arbitrary pair of mating surfaces can be calculated. The deviations of the screw, roller, and nut from their nominal positions are considered in the transformation matrices, which describe the posit

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Magrini, L., A. Cardwell, R. L. M. Corradi, A. Mampaso, and M. Perinotto. "Accurate positions of candidate planetary nebulae in M 33." June 17, 2003. https://doi.org/10.1051/0004-6361:20010044.

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"POSITIONS AVAILABLE." Eos, Transactions American Geophysical Union 95, no. 5 (2014): 52. http://dx.doi.org/10.1002/2014eo050024.

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"POSITIONS AVAILABLE." Eos, Transactions American Geophysical Union 95, no. 6 (2014): 58–60. http://dx.doi.org/10.1002/2014eo060012.

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"POSITIONS AVAILABLE." Eos, Transactions American Geophysical Union 95, no. 7 (2014): 67–68. http://dx.doi.org/10.1002/2014eo070012.

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"POSITIONS AVAILABLE." Eos, Transactions American Geophysical Union 95, no. 8 (2014): 75–76. http://dx.doi.org/10.1002/2014eo080011.

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"POSITIONS AVAILABLE." Eos, Transactions American Geophysical Union 95, no. 13 (2014): 114–16. http://dx.doi.org/10.1002/2014eo130011.

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