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Journal articles on the topic 'Disks'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Kiyamov, Asror Z. "Comb-forming roller with elastic rods." E3S Web of Conferences 390 (2023): 06041. http://dx.doi.org/10.1051/e3sconf/202339006041.

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A design diagram of comb formation roller in resilient stems is given. Comb-forming roller consists of support and small discs, as well as elastic rods. Elastic rods are installed along the perimeter of the diameter of the disks through their holes. Analytical dependences and mathematical models are obtained for determining the distance between disks, the diameter of disks, the diameter, length and number of elastic rods. One-factor experiments were carried out to substantiate the diameter of the disks and the number of rods. It was found that with the length of the elastic rods of the comb-fo

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2

Andrulionis, Robertas, and Ieva Švagždytė. "RESEARCH OF EFFECTIVENESS OF DISK SHAPED ELEMENTS FOR OIL REMOVAL / DISKINIŲ NAFTOS SURINKIMO ELEMENTŲ EFEKTYVUMO TYRIMAS." Mokslas – Lietuvos ateitis 7, no. 6 (2016): 624–27. http://dx.doi.org/10.3846/mla.2015.851.

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Influence of grooved disc rotation speed and inclination angle of fluid from surface on amount of removed liquid, was studied in this article. Stand with possibility to change disc, rotation speed of disc and angle was designed and assembled. U and V shaped groove discs were used. Edible and industrial oil SAE 80W90 were removed from water surface and collected into the flash. Optimal disc rotation speed, which is 15 rpm and disc inclination angle 00 were determined after analysis of results. Straipsnyje išnagrinėta skirtingais griovėtais diskais nuo vandens paviršiaus surenkamo skysčio ir jam

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ATANASIU, COSTICĂ, and STEFAN SOROHAN. "Buckling of perforated discs." Journal of Engineering Sciences and Innovation 9, no. 1 (2024): 1–14. https://doi.org/10.56958/jesi.2024.9.1.1.

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The paper presents the results obtained regarding the stability of discs perforated by two, four and 96 circular holes. Circular discs are subjected to two types of loadings: diametrical compression by concentrated forces and radial compression produced by an equivalent uniformly distributed load on the contour of the disks. The influence of the radius of the holes, the distance between the holes and the way of applying the loads, on the value of the critical buckling load is investigated. The results obtained by the finite element method are compared with those obtained in the case of non-per

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4

ZHONG, HONGJIE, and CUNBIAO LEE. "PATHS OF FREELY FALLING DISKS." Modern Physics Letters B 23, no. 03 (2009): 373–76. http://dx.doi.org/10.1142/s0217984909018436.

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The free falling motion of round thin disks in quiescent water was investigated experimentally. The mean density of the disks were about 1.05 g/cm3, slightly larger than water, and thickness to diameter ratio is 0.1. In this letter, We reported two cases with different mass distributions, in one case the disk's center of mass coincided with the geometry center and in another case it was deviated. Two CCD cameras were used to photograph the falling disk simultaneously, the disk's six degrees of freedom were obtained via a stereoscopic vision method. In the first case fluttering motion was obser

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Johnson, Ted M., Rebecca G. Martin, Stephen Lepp, and Stephen H. Lubow. "The Fraction of Polar-aligned Circumbinary Disks." Astronomical Journal 170, no. 2 (2025): 77. https://doi.org/10.3847/1538-3881/adde5d.

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Abstract Circumbinary gas disks that are misaligned to the binary orbital plane evolve toward either a coplanar or a polar-aligned configuration with respect to the binary host. The preferred alignment depends on the dynamics of the disk: whether it undergoes librating or circulating nodal precession, with librating disks evolving to polar inclinations and circulating disks evolving to coplanar. We quantify the fraction of binary star systems whose disks are expected to have polar orbits f polar, extending previous work to include disks with nonzero mass. Our results suggest that, for low mass

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Hamidov, Namik, Zabit Aslanov, and Gultakin Imanova. "SOME FEATURES OF THE OPERATING CAPACITY OF THE REDUCER." Scientific works/Elmi eserler 2 (April 2, 1996): 109–13. http://dx.doi.org/10.58225/sw.2022.2.109-113.

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Abstract. The main factor affecting the performance of the clutch is the load. The load on the clutch is sign-variable and uneven. It strongly depends on the state of the antenna system (with ice, without ice) as well as on the strength and direction of the wind. During operation, in places of the highest specific pressure, the discs seize and weld, which leads to deep tearing of the metal with the formation of deep grooves, ledges and depressions. When the disks seize, which is very often the case in operating conditions, the clutch works like a single shaft, and when the multi-ton cabin move

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Funes, S.J.,, José G., and Enrico Maria Corsini. "Galaxy Disks and Disk Galaxies1." Publications of the Astronomical Society of the Pacific 112, no. 777 (2000): 1510–11. http://dx.doi.org/10.1086/317703.

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8

Yakhin, Sergey, Il'fat Aliakberov, and Adel Vakhitov. "SUBSTANTIATION OF PARAMETERS OF A ROTARY IMPLEMENT FOR SURFACE TREATMENT OF SOIL WITH INCLINED HEXAGONAL DISC." Vestnik of Kazan State Agrarian University 17, no. 4 (2023): 106–11. http://dx.doi.org/10.12737/2073-0462-2023-106-111.

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For surface tillage, rotary implements with disk working bodies are widely used. In recent decades, intensive research has been carried out on the development of rotary tools with polygonal disks. They were implemented in practice in the form of hexagonal disks mounted on a shaft at an angle of 90° and performing the usual rotational movement around its axis. Of interest are polygonal discs, which are fixed obliquely on the shaft. The well-known tillage tool with inclined square discs was not implemented in practice, since it turned out to be technologically unstable and did not provide a unif

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9

Kachan, O. Ya, and S. O. Ulanov. "DETERMINATION OF REGULARITIES OF TREATMENT OF DISKS IN A FLUIDIZED BED OF ABRASIVE." Kosmìčna nauka ì tehnologìâ 29, no. 6 (2023): 62–67. http://dx.doi.org/10.15407/knit2023.06.062.

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n this work, the main regularities of processing disks in a fluidized bed of abrasive are established.The research was carried out on the АПС-600A installation when processing disks in a fluidized bed of abrasive. When processing discs, abrasive grains of groups 24A, 63C, and a mixture of abrasive grains 24A63+24A20 (50 % + 50 %) were used.The grain size of the abrasive grains varied in the range № 20 … № 80.The processed disks were made of such alloys as VT3-1, VT-9, EI698-VD, steel 45 HRC 38...45, and aluminum alloy D1T. The peripheral speed of the parts is Vp = 5...40 m/s. The maximum air c

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10

Lee, Jung Hoon. "Weak reducing disks and disk surgery." Journal of Knot Theory and Its Ramifications 27, no. 12 (2018): 1850069. http://dx.doi.org/10.1142/s0218216518500694.

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Let [Formula: see text] be an unknot in [Formula: see text]-bridge position in the [Formula: see text]-sphere. We give an example of a pair of weak reducing disks [Formula: see text] and [Formula: see text] for [Formula: see text] such that both disks obtained from [Formula: see text] ([Formula: see text]) by a surgery along any outermost disk in [Formula: see text], cut off by an outermost arc of [Formula: see text] in [Formula: see text], are not weak reducing disks, i.e. the property of weak reducibility of compressing disks is not preserved by a disk surgery.

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11

Montgomery, M. M. "Modeling Fluid Flow Effects in Close Binary and Protoplanetary Systems." Proceedings of the International Astronomical Union 7, S282 (2011): 549–50. http://dx.doi.org/10.1017/s1743921311028365.

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AbstractAccretion disks around some white dwarfs in Cataclysmic Variables are thought to tilt around the line of nodes by the lift force acting at the disk's center of pressure. We investigate whether protoplanetary disks can also experience disk tilt. We find that lift may be possible by an asymmetric, net uni-directional, in-falling gas/dust stream overflowing a bluff body (e.g., Class I sources) or inner annuli of young Class II sources if gas/dust is still in-falling and the aspect ratio and disk surface area are large enough. However, inner disks of Class II sources LkCa 15, UX Tau A, and

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Hincapié Mejía, Gina María, Juan Miguel Marín S., Luis Alberto Rios, and Gloria Restrepo. "Evaluating E. coli degradation using a rotatory disk photoreactor." Ingeniería e Investigación 27, no. 3 (2007): 65–69. http://dx.doi.org/10.15446/ing.investig.v27n3.14846.

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Degradation of the bacterium E. coli was studied using a rotatory disk photoreactor manufactured in stainless steel to ascertain this photoreaction system’s behavior in different operating conditions. The photoreactor was equipped with 6 black light bulbs (BLB) used as a source of UV light and fitted with 7 removable disks made of common frosted glass impregnated with TiO2 photocatalyzer which were coupled to a rotation system. TiO2 was impregnated on the disks using the sol-gel method varying molar precursor gel ratios. Abrasion resistance, disk adhesion and surface uniformity tests were carr

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Avramenko, R., S. Wolf, T. F. Illenseer, and S. Rehberg. "Selected aspects of the analysis of molecular line observations of edge-on circumbinary disks." Astronomy & Astrophysics 642 (October 2020): A127. http://dx.doi.org/10.1051/0004-6361/201935610.

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Context. Inner cavities, accretion arms, and density waves are characteristic structures in the density distribution of circumbinary disks. They are the result of the tidal interaction of the non-axisymmetric gravitational forces of the central binary with the surrounding disk and are most prominent in the inner region, where the asymmetry is most pronounced. Aims. The goal of this study is to test the feasibility of reconstructing the gas density distribution and quantifying properties of structures in the inner regions of edge-on circumbinary disks using multiple molecular line observations.

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14

Khaibrakhmanov, Sergey A., Alexander E. Dudorov, and Andrey M. Sobolev. "Rising magnetic flux tubes as a source of IR-variability of the accretion disks of young stars." Proceedings of the International Astronomical Union 14, S345 (2018): 295–96. http://dx.doi.org/10.1017/s1743921319001431.

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AbstractWe investigate dynamics of slender magnetic flux tubes (MFT) in the accretion disks of young stars. Simulations show that MFT rise from the disk and can accelerate to 20-30 km/s causing periodic outflows. Magnetic field of the disk counteracts the buoyancy, and the MFT oscillate near the disk’s surface with periods of 10-100 days. We demonstrate that rising and oscillating MFT can cause the IR-variability of the accretion disks of young stars.

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15

Nakao, Yasushi. "Enhancement of Turbulent Viscosity by Global Magnetic Fields in Accretion Disks." Symposium - International Astronomical Union 188 (1998): 412. http://dx.doi.org/10.1017/s0074180900115773.

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A model of magnetohydrodynamic (MHD) turbulence in accretion disks with global magnetic fields is constructed using a second-order closure modeling of turbulence. The transport equations of the Reynolds stress tensor, the Maxwell stress tensor, and the cross-helicity tensor (the correlation of velocity fluctuation and magnetic fluctuation) are closed by second-order quantities using atwo-scale direct interaction approximation(TSDIA). The quantities appearing these equations are considered to be those averaged in the vertical direction of the disks. The turbulence is assumed to be stationary. W

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16

Angelo, Isabel, Gaspard Duchene, Karl Stapelfeldt, et al. "Demographics of Protoplanetary Disks: A Simulated Population of Edge-on Systems." Astrophysical Journal 945, no. 2 (2023): 130. http://dx.doi.org/10.3847/1538-4357/acbb01.

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Abstract The structure of protoplanetary disks plays an essential role in planet formation. A disk that is highly inclined, or “edge-on,” is of particular interest since its geometry provides a unique opportunity to study the disk’s vertical structure and radial extent. Candidate edge-on protoplanetary disks are typically identified via their unique spectral energy distributions (SEDs) and subsequently confirmed through high-resolution imaging. However, this selection process is likely biased toward the largest, most-massive disks, and the resulting sample may not accurately represent the unde

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17

Sydorenko, Yuryi M., Bohdan Jo Semon, Vadim V. Yakovenko, Yevhen V. Ryzhov, and Eugene G. Ivanyk. "Spatial Distribution of Mass and Speed on Movement of Two Shrapnel Discs of Variable Thickness in Explosive Load." Defence Science Journal 70, no. 5 (2020): 479–85. http://dx.doi.org/10.14429/dsj.70.14524.

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Results of studies of the explosive expansion of a set of shrapnel discs of natural crushing are described in the article. Set consisted of two disks of different thickness, but of a fixed total mass. The studies were carried out by computer simulation of shock-wave processes in a continuous formulation using the ANSYS/LS-DYNA program. The program of computer design foresees development of three-dimensional certainly-element model including, in accordance with symmetry of the examined system fourth part of the examined explosive system of casting block, with imposed on its knots of the proper

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18

Plank, James S. "The Raid-6 Liber8Tion Code." International Journal of High Performance Computing Applications 23, no. 3 (2009): 242–51. http://dx.doi.org/10.1177/1094342009106191.

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Large centralized and networked storage systems have grown to the point where the single fault tolerance provided by RAID-5 is no longer enough. RAID-6 storage systems protect k disks of data with two parity disks so that the system of k + 2 disks may tolerate the failure of any two disks. Coding techniques for RAID-6 systems are varied, but an important class of techniques are those with minimum density, featuring an optimal combination of encoding, decoding and modification complexity. The word size of a code has an impact on both how the code is laid out on each disk's sectors and how large

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Hristov, Krasimir, Nikolay Ishkitiev, Marina Miteva, and Nataliya Gateva. "EVALUATION OF THE ADHESION AND MORPHOLOGY OF STEM CELLS FROM APICAL PAPILLA IN DIRECT CONTACT WITH MTA AND BIODENTINE." Journal of IMAB - Annual Proceeding (Scientific Papers) 28, no. 4 (2022): 4655–59. http://dx.doi.org/10.5272/jimab.2022284.4655.

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Purpose: To investigate the use of tricalcium silicate cement Biodentine as an alternative to MTA in regenerative endodontic procedures by assessing the morphology and adhesion of stem cells from apical papilla in direct contact with these materials Materials/Methods: Glass ionomer cement, MTA and Biodentine disks with identical size were created. Stem cells from apical papilla were incubated on these disks, and their size and morphology were assessed with a scanning electron microscope. Results: No adhesion of SCAP was observed when incubating cells with glass ionomer disks, which can be expl

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20

Scorza, Cecilia, and Ralf Bender. "Disky Ellipticals in the Hubble Sequence." Symposium - International Astronomical Union 171 (1996): 55–59. http://dx.doi.org/10.1017/s0074180900232154.

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About one third of the elliptical galaxies show disky isophotes (Bender et al. 1989). These are low luminosity objects, are rotationally flattened (Carter 1987, Bender 1988b, Nieto 1988), are much weaker radio emitters than ellipticals in average and show no strong X-ray emission in excess of their discrete sources contribution. They have pointed isophotes which are thought to reflect the presence of embedded stellar disks. A large number of these disks could be hidden due to low inclinations (Rix and White 1990). Because of these properties, which makes them strongly resemble S0 galaxies, it

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Ekkerdt, A. A. "Problems of Studying the Purpose of Disks with Concentric Ornament in Russian Archaeology." Izvestiya of Altai State University, no. 3(125) (July 12, 2022): 73–76. http://dx.doi.org/10.14258/izvasu(2022)3-11.

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The article is devoted to a historiographical review of scientific works, which provides an analysis and purpose of disks with concentric ornament, common in the Urals and Siberia in the first half of the 1st millennium AD. The stages of the history of the study of bronze disks with concentric ornament with the definition of their purpose in a particular complex are distinguished and characterized. When describing each of the stages, the most significant works of the authors who worked during this period are given within the framework of the designated topic, the main ideas and concepts are hi

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Qian, Yansong, and Yanqin Wu. "Shadows Wreak Havoc in Transition Disks." Astrophysical Journal 976, no. 1 (2024): 5. http://dx.doi.org/10.3847/1538-4357/ad8233.

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Abstract We demonstrate that shadows cast on a protoplanetary disk can drive it eccentric. Stellar irradiation dominates heating across much of these disks, so an uneven illumination can have interesting dynamical effects. Here, we focus on transition disks. We carry out 3D Athena++ simulations, using a constant thermal relaxation time to describe the disk’s response to changing stellar illumination. We find that an asymmetric shadow, a feature commonly observed in real disks, perturbs the radial pressure gradient and distorts the fluid streamlines into a set of twisted ellipses. Interactions

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Kormendy, John. "Internal secular evolution in disk galaxies: the growth of pseudobulges." Proceedings of the International Astronomical Union 3, S245 (2007): 107–12. http://dx.doi.org/10.1017/s1743921308017407.

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AbstractObservational and theoretical evidence that internal, slow (“secular”) evolution reshapes galaxy disks is reviewed in Kormendy & Kennicutt (2004). This update has three aims. First, I emphasize that this evolution is very general – it is as fundamental to the evolution of galaxy disks as (e. g.) core collapse is to globular clusters, as the production of hot Jupiters is to the evolution of protoplanetary disks, and as evolution to red giants containing proto-white-dwarfs is to stellar evolution. One consequence for disk galaxies is the buildup of dense central components that get m

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Hom, Justin, Thomas M. Esposito, Katie A. Crotts, et al. "The Disks In Scorpius–Centaurus Survey (DISCS). I. Four Newly Resolved Debris Disks in Polarized Intensity Light." Astronomical Journal 170, no. 1 (2025): 46. https://doi.org/10.3847/1538-3881/add528.

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Abstract The presence of infrared excesses around stars directly correlates with spatially resolved imaging detections of circumstellar disks at both millimeter and optical/near-infrared wavelengths. High-contrast imagers have resolved dozens of circumstellar disks with scattered light polarimetric imaging. Many of these detections are members of the Scorpius–Centaurus OB association, demonstrating it to be a rich sample for investigating planetary system architectures and planet–disk interactions. With the goal of expanding the sample of directly imaged debris disks in Scorpius–Centaurus, we

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Domotenko, Lubov` Viktorovna, A. Yu Mironov, I. S. Kosilova, and A. P. Shepelin. "Standardness of antimicrobial discs by various manufacturers in the light of import substitution." Russian Clinical Laboratory Diagnostics 67, no. 9 (2022): 550–56. http://dx.doi.org/10.51620/0869-2084-2022-67-9-550-556.

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In connection with the introduction of economic sanctions against the Russian Federation by the United States, the European Union, Japan, and a number of other countries, import substitution is becoming one of the strategic objectives of the Russian economy The comparative assessment of standardness and effectiveness of six antimicrobial commercial producer-varying disks for clinical and test strains of microorganisms has been conducted. It is based on analyzing of the variation coefficient (Cv) of inhibition zone diameters, mean values, and diameter values ranges, which are indicators of repr

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Pfalzner, S., S. Umbreit, and Th Henning. "Disk‐Disk Encounters between Low‐Mass Protoplanetary Accretion Disks." Astrophysical Journal 629, no. 1 (2005): 526–34. http://dx.doi.org/10.1086/431350.

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Robert, C. M. T., A. Crida, E. Lega, H. Méheut, and A. Morbidelli. "Toward a new paradigm for Type II migration." Astronomy & Astrophysics 617 (September 2018): A98. http://dx.doi.org/10.1051/0004-6361/201833539.

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Context. Giant planets open gaps in their protoplanetary and subsequently suffer so-called type II migration. Schematically, planets are thought to be tightly locked within their surrounding disks, and forced to follow the viscous advection of gas onto the central star. This fundamental principle, however, has recently been questioned as migrating planets were shown to decouple from the gas’ radial drift. Aims. In this framework, we question whether the traditionally used linear scaling of migration rate of a giant planet with the disk’s viscosity still holds. Additionally, we assess the role

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Ertel, S., S. Wolf, and J. Rodmann. "Observing planet-disk interaction in debris disks." Astronomy & Astrophysics 544 (July 26, 2012): A61. http://dx.doi.org/10.1051/0004-6361/201219236.

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Bai, Xue-Ning, Jiani Ye, Jeremy Goodman, and Feng Yuan. "MAGNETO-THERMAL DISK WINDS FROM PROTOPLANETARY DISKS." Astrophysical Journal 818, no. 2 (2016): 152. http://dx.doi.org/10.3847/0004-637x/818/2/152.

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GLUTSCH, S., B. ADOLPH, and F. BECHSTEDT. "Excitons in quantum disks and disk arrays." Le Journal de Physique IV 03, no. C5 (1993): 373–76. http://dx.doi.org/10.1051/jp4:1993578.

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31

Essa, Kevin. "Manufacturing disks and disk drives: Open problems." Journal of the Acoustical Society of America 95, no. 5 (1994): 2814. http://dx.doi.org/10.1121/1.409701.

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Kock, Joost P. de, Seiji Kobayashi, and Hisayuki Yamatsu. "Disk Noise Measurement System for Optical Disks." Optical Review 2, no. 6 (1995): 424–33. http://dx.doi.org/10.1007/s10043-995-0424-0.

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Bohn, A. J., M. Benisty, K. Perraut, et al. "Probing inner and outer disk misalignments in transition disks." Astronomy & Astrophysics 658 (February 2022): A183. http://dx.doi.org/10.1051/0004-6361/202142070.

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Context. Transition disks are protoplanetary disks with dust-depleted cavities, possibly indicating substantial clearing of their dust content by a massive companion. For several known transition disks, dark regions interpreted as shadows have been observed in scattered light imaging and are hypothesized to originate from misalignments between distinct regions of the disk. Aims. We aim to investigate the presence of misalignments in transition disks. We study the inner disk (<1 au) geometries of a sample of 20 well-known transition disks with Very Large Telescope Interferometer (VLTI) GRAVI

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Fraser-McKelvie, A., and L. Cortese. "Beyond Galaxy Bimodality: The Complex Interplay between Kinematic Morphology and Star Formation in the Local Universe." Astrophysical Journal 937, no. 2 (2022): 117. http://dx.doi.org/10.3847/1538-4357/ac874d.

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Abstract It is generally assumed that galaxies are a bimodal population in both star formation and structure; star-forming galaxies are disks, while passive galaxies host large bulges or are entirely spheroidal. Here we test this scenario by presenting a full census of the kinematic morphologies of a volume-limited sample of galaxies in the local universe extracted from the MaNGA galaxy survey. We measure the integrated stellar line-of-sight velocity to velocity dispersion ratio (V/σ) for 4574 galaxies in the stellar mass range 9.75 < log M ⋆ [ M ⊙ ] < 11.75 . We show that at fixed stell

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Yoshida, Tomohiro C., Hideko Nomura, Kenji Furuya, et al. "The First Spatially Resolved Detection of ¹³CN in a Protoplanetary Disk and Evidence for Complex Carbon Isotope Fractionation." Astrophysical Journal 966, no. 1 (2024): 63. http://dx.doi.org/10.3847/1538-4357/ad2fb4.

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Abstract Recent measurements of carbon isotope ratios in both protoplanetary disks and exoplanet atmospheres have suggested a possible transfer of significant carbon isotope fractionation from disks to planets. For a clearer understanding of the isotopic link between disks and planets, it is important to measure the carbon isotope ratios in various species. In this paper, we present a detection of the 13CN N = 2 − 1 hyperfine lines in the TW Hya disk with the Atacama Large Millimeter/submillimeter Array. This is the first spatially resolved detection of 13CN in disks, which enables us to measu

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Lysenko, Serhii. "The Influence of the Tribological Efficiency of Resource-Determining Яonjugations of Transmission Parts on the Operational Reliability of Transport Vehicles". Central Ukrainian Scientific Bulletin. Technical Sciences 2, № 5(36) (2022): 213–24. http://dx.doi.org/10.32515/2664-262x.2022.5(36).2.213-224.

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This work examines the conditions of tribological efficiency of couplings of TM transmission discs as resource-determining parts and its influence on the operational reliability of machines. The change in hydrodynamic friction, oil consumption, oil carrying capacity by rotating disks in both laminar and turbulent modes of transmission oil flow is substantiated. The nature of oil discharge from the working surface of the disk in laminar and turbulent modes is considered. Based on the system of the Navier-Stokes equation, the change in the effective characteristics of the coupled transmission di

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Gryadunov, Sergey S., and Vladimir V. Sivakov. "The Use of Surfacing Materials to Increase the Durability of Disc Harrow Working Elements." Engineering Technologies and Systems 31, no. 4 (2021): 544–58. http://dx.doi.org/10.15507/2658-4123.031.202104.544-558.

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Introduction. For surface tillage operation there widely used disc harrows, working bodies of which are discs wearing out during operation. The wear intensity of discs depends on the wear resistance of their working surfaces, working modes and properties of the cultivated soil. It has been found that an effective way to increase the life of discs is surfacing them with wear-resistant materials. The aim of the work is to study the wear out of surfacing materials, which can be used to harden discs and to make recommendation for the use of these materials in the repair departments of agricultural

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Kamali, F., C. Henkel, S. Koyama, et al. "Accretion disk versus jet orientation in H2O megamaser galaxies." Astronomy & Astrophysics 624 (April 2019): A42. http://dx.doi.org/10.1051/0004-6361/201834600.

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Context. An essential part of the paradigm describing active galactic nuclei is the alignment between the radio jet and the associated rotation axis of the sub-pc accretion disks. Because of the small linear and angular scales involved, this alignment has not yet been checked in a sufficient number of low luminosity active galactic nuclei (LLAGNs). Aims. The project examines the validity of this paradigm by measuring the radio continuum on the same physical scale as the accretion disks to investigate any possible connection between these disks and the radio continuum. Methods. We observed a sa

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Nakano, Takenori. "Gravitational Instability of Magnetized Gaseous Disks." Publications of the Astronomical Society of Japan 40, no. 5 (1988): 593–604. https://doi.org/10.1093/pasj/40.5.593.

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Abstract The gravitational instability of magnetized isothermal gaseous disks is investigated numerically with the linear perturbation analysis for some cases of magnetic configuration. A dispersion relation is obtained for disks permeated by uniform magnetic field perpendicular to the disk layer. As the magnetic field strength increases, the unstable region in the wavelength shrinks and the growth rate decreases, and at last when the magnetic pressure becomes higher than the gas pressure on the midplane, the disk is completely stabilized. Thus the magnetic field has an effect of stabilizing s

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Lee, D. W., E. J. Lee, Sung Su Chun, et al. "A Collagen Grafting on Hydroxyapatite to Enhancement of Bone Cell Attachment." Key Engineering Materials 396-398 (October 2008): 41–45. http://dx.doi.org/10.4028/www.scientific.net/kem.396-398.41.

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A collagen material was chemically grafted on hydroxyapatite (HA) to enhance bone cell attachment because the collagen is a major constituent of connective tissues and has been regarded as one of the most excellent coating materials for bone bonding. First, HA disks were prepared with 12mm diameter and 1mm thickness. And then collagen (type I) was immobilbized on the HA surface using a 3-APTES coupling agent on HA disk surfaces. MC3T3-E1 osteoblasts were seeded on the collagen-grafted and non-grated HA disks and cultured for 4 hrs to evaluate the cell adhesion on the HA discs. The Attached cel

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Leiendecker, Harrison, Hannah Jang-Condell, Neal J. Turner, and Adam D. Myers. "Dust Rings and Cavities in the Protoplanetary Disks around HD 163296 and DoAr 44." Astrophysical Journal 941, no. 2 (2022): 172. http://dx.doi.org/10.3847/1538-4357/aca32d.

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Abstract We model substructure in the protoplanetary disks around DoAr 44 and HD 163296 in order to better understand the conditions under which planets may form. We match archival millimeter-wavelength thermal emission against models of the disks’ structure that are in radiation balance with the starlight heating and in vertical hydrostatic equilibrium, and then we compare to archival polarized scattered near-infrared images of the disks. The millimeter emission arises in the interior, while the scattered near-infrared radiation probes the disks’ outer layers. Our best model of the HD 163296

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Tanaka, Hidekazu, Youhei Himeno, and Shigeru Ida. "Dust Growth and Settling in Protoplanetary Disks and Disk Spectral Energy Distributions. I. Laminar Disks." Astrophysical Journal 625, no. 1 (2005): 414–26. http://dx.doi.org/10.1086/429658.

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Pérez, Laura M. "Formation and Evolution of Protoplanetary Disks: Observations and Modeling of Jets, Disks, and Disk Substructures." Proceedings of the International Astronomical Union 14, S345 (2018): 96–101. http://dx.doi.org/10.1017/s1743921319002278.

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AbstractPlanet formation takes place in the gaseous and dusty disks that surround young stars, known as protoplanetary disks. With the advent of sensitive observations and together with developments in theory, our field is making rapid progress in understanding how the evolution of protoplanetary disks takes place, from its inception to the end result of a fully-formed planetary system. In this review, I discuss how observations that trace both the dust and gas components of these systems inform us about their evolution, mass budget, and chemistry. Particularly, the process of disk evolution a

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Luo, Siqiang, Yifeng Luo, Shuigeng Zhou, Gao Cong, and Jihong Guan. "DISKs." Proceedings of the VLDB Endowment 5, no. 12 (2012): 1966–69. http://dx.doi.org/10.14778/2367502.2367549.

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Rafikov, Roman R. "Protoplanetary Disks as (Possibly) Viscous Disks." Astrophysical Journal 837, no. 2 (2017): 163. http://dx.doi.org/10.3847/1538-4357/aa6249.

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Kang, Byeonguk, Jongmin Choi, and Hee-Kap Ahn. "Intersecting disks using two congruent disks." Computational Geometry 110 (March 2023): 101966. http://dx.doi.org/10.1016/j.comgeo.2022.101966.

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Ghafourian, Neda, and Mahmood Roshan. "Evolution of disk galaxies in MOdified Gravity (MOG)." Proceedings of the International Astronomical Union 14, S353 (2019): 152–53. http://dx.doi.org/10.1017/s1743921319008810.

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AbstractEvolution and the formation of bars in the galactic disks is studied in the context of Modified Gravity (MOG) by using N-body simulations. It is found that changing the value of free parameters of the model can effectively alter the strength of the bar and disk’s stability.

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Vorobyov, Eduard, and Christian Theis. "Structure Formation in Anisotropic Disks." Proceedings of the International Astronomical Union 2, S235 (2006): 143. http://dx.doi.org/10.1017/s1743921306005758.

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The majority of normal disk galaxies are characterized by non-axisymmetric structures like spirals or bars. These structural elements have been widely discussed in the literature as a result of gravitational instabilities which are connected to growing density waves or global instabilities of disks. A first insight into the properties of galactic discs was provided by linear stability analysis. However, a disadvantage of linear stability analysis remained its restriction to small perturbations, both in amplitude and wavelength. Thus, numerical simulations, especially hydrodynamical and stellar

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WILSON, R. E., and DIRK TERRELL. "Learning about Algol Disks-Learning from Algol Disksa." Annals of the New York Academy of Sciences 675, no. 1 (1992): 65–74. http://dx.doi.org/10.1111/j.1749-6632.1992.tb56790.x.

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Nikolayev, V. A. "Geometric, kinematic and dynamic parameters of the disc ripper." Russian Automobile and Highway Industry Journal 18, no. 5 (2021): 476–87. http://dx.doi.org/10.26518/2071-7296-2021-18-5-476-487.

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Introduction. The unit of continuous action for the formation of the underlying layer is designed to increase labour productivity in the construction of roads and other objects, for the construction of which it is necessary to remove the upper layer of soil. For loosening of soil in the unit used bit-like working bodies. Often, disc working bodies are used to cut the soil. Therefore, the expediency of using passive discs in road-building technical means, in particular, in the unit of continuous action for the formation of the underlying layer of highways, is of practical interest. Despite the

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