Bibliografías temáticas / Rotating

Literatura académica sobre el tema "Rotating"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 7 de julio de 2024

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Artículos de revistas sobre el tema "Rotating"

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Erasmus, N., D. Kramer, A. McNeill, D. E. Trilling, P. Janse van Rensburg, G. T. van Belle, J. L. Tonry, L. Denneau, A. Heinze y H. J. Weiland. "Discovery of superslow rotating asteroids with ATLAS and ZTF photometry". Monthly Notices of the Royal Astronomical Society 506, n.º 3 (10 de julio de 2021): 3872–81. http://dx.doi.org/10.1093/mnras/stab1888.

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ABSTRACT We present here the discovery of a new class of superslow rotating asteroids (Prot ≳1000 h) in data extracted from the Asteroid Terrestrial-impact Last Alert System (ATLAS) and Zwicky Transient Facility (ZTF) all-sky surveys. Of the 39 rotation periods we report here, 32 have periods longer than any previously reported unambiguous rotation periods currently in the Asteroid Light Curve Data base. In our sample, seven objects have a rotation period >4000 h and the longest period we report here is 4812 h (∼200 d). We do not observe any correlation between taxonomy, albedo, or orbital properties with superslow rotating status. The most plausible mechanism for the creation of these very slow rotators is if their rotations were slowed by YORP spin-down. Superslow rotating asteroids may be common, with at least 0.4 per cent of the main-belt asteroid population with a size range between 2 and 20 km in diameter rotating with periods longer than 1000 h.
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LOPEZ, J. M. "Characteristics of endwall and sidewall boundary layers in a rotating cylinder with a differentially rotating endwall". Journal of Fluid Mechanics 359 (25 de marzo de 1998): 49–79. http://dx.doi.org/10.1017/s002211209700829x.

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The flow in a rotating cylinder driven by the differential rotation of its top endwall is studied by numerically solving the time-dependent axisymmetric Navier–Stokes equations. When the differential rotation is small, the flow is well described in terms of similarity solutions of individual rotating disks of infinite radius. For larger differential rotations, whether the top is co-rotating or counter-rotating results in qualitatively distinct behaviour. For counter-rotation, the boundary layer on the top endwall separates, forming a free shear layer and this results in a global coupling between the boundary layer flows on the various walls and a global departure from the similarity flows. At large Reynolds numbers, this shear layer becomes unstable. For a co-rotating top, there is a qualitative change in the flow depending on whether the top rotates faster or slower than the rest of the cylinder. When the top rotates faster, so does the bulk of the interior fluid, and the sidewall boundary layer region where the fluid adjusts to the slower rotation rate of the cylinder is centrifugally unstable. The secondary induced meridional flow is also potentially unstable in this region. This is manifested by the inflectional radial profiles of the vertical velocity and azimuthal vorticity in this region. At large Reynolds numbers, the instability of the sidewall layer results in roll waves propagating downwards.
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Kazachkov, Ivan. "Modeling of the Flow due to Double Rotations Causing Phenomenon of Negative Pressure". WSEAS TRANSACTIONS ON FLUID MECHANICS 18 (31 de diciembre de 2023): 259–71. http://dx.doi.org/10.37394/232013.2023.18.25.

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This paper is devoted to mathematical modeling and computational experiments of a flow with negative pressure. A previously unknown class of fluid flow under the action of counter-current centrifugal forces is in focus. Volumetric forces in a non-conducting fluid can arise from gravity, vibrations, or rotations. In this paper, we consider controlled variable volumetric forces in a system with two rotations around the vertical axis and the tangential axis of a horizontal disk rotating around the vertical axis. The study of the coordinate system during double rotation showed that the double rotation about two perpendicular axes, one of which moves along a tangential direction to the rotating horizontal disk, is equal to the rotation around the oscillating axis inclined at some angle to the vertical axis.
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Fischer, Patrick, Charles-Henri Bruneau y Hamid Kellay. "Numerical Study of Rotating Thermal Convection on a Hemisphere". Fluids 5, n.º 4 (20 de octubre de 2020): 185. http://dx.doi.org/10.3390/fluids5040185.

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Numerical simulations of rotating two-dimensional turbulent thermal convection on a hemisphere are presented in this paper. Previous experiments on a half soap bubble located on a heated plate have been used for studying thermal convection as well as the effects of rotation on a curved surface. Here, two different methods have been used to produce the rotation of the hemisphere: the classical rotation term added to the velocity equation, and a non-zero azimuthal velocity boundary condition. This latter method is more adapted to the soap bubble experiments. These two methods of forcing the rotation of the hemisphere induce different fluid dynamics. While the first method is classically used for describing rotating Rayleigh–Bénard convection experiments, the second method seems to be more adapted for describing rotating flows where a shear layer may be dominant. This is particularly the case where the fluid is not contained in a closed container and the rotation is imposed on only one side of it. Four different diagnostics have been used to compare the two methods: the Nusselt number, the effective computation of the convective heat flux, the velocity and temperature fluctuations root mean square (RMS) generation of vertically aligned vortex tubes (to evaluate the boundary layers) and the energy/enstrophy/temperature spectra/fluxes. We observe that the dynamics of the convective heat flux is strongly inhibited by high rotations for the two different forcing methods. Also, and contrary to classical three-dimensional rotating Rayleigh–Bénard convection experiments, almost no significant improvement of the convective heat flux has been observed when adding a rotation term in the velocity equation. However, moderate rotations induced by non-zero velocity boundary conditions induce a significant enhancement of the convective heat flux. This enhancement is closely related to the presence of a shear layer and to the thermal boundary layer just above the equator.
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Shaymatov, Sanjar, Bobomurat Ahmedov y Eldor Karimbaev. "Can a Rotating Black Hole Be Overspun in Seven Dimensions?" Universe 9, n.º 4 (17 de abril de 2023): 190. http://dx.doi.org/10.3390/universe9040190.

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Five-dimensional rotating black holes with two rotations could be overspun except for a single rotation, whereas a black hole in six dimensions always obeys the weak cosmic censorship conjecture (WCCC) in the weak form even for linear particle accretion. In this paper, we investigate the overspinning of a seven-dimensional rotating black hole with three rotation parameters. It is shown that a black hole in the seven dimensions cannot be similarly overspun, thereby obeying the WCCC even under linear particle accretion. It turns out that a black hole always respects the weak cosmic censorship conjecture in seven dimensions.
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Boshkayev, K. "Non-rotating and slowly rotating stars in classical physics". International Journal of Mathematics and Physics 5, n.º 1 (2014): 69–80. http://dx.doi.org/10.26577/2218-7987-2014-5-1-69-80.

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Li, Jingyuan y Zifeng Li. "Applications of the Theory of Continuous Oil Film Lubrication of a Radial Sliding Bearing for Three Combined Conditions". Applied Physics Research 8, n.º 2 (15 de febrero de 2016): 22. http://dx.doi.org/10.5539/apr.v8n2p22.

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<p class="1Body">The theory of lubrication of a radial sliding bearing is extended to three cases: the shaft neck rotation and bush rotation bearing, the rotating load bearing, and the floating sleeve bearing. For the bearing with rotating shaft neck and rotating bush, fixing the observer at the bushing can enable the determination, in a simple and more accurate manner, of the bearing capacity of the bearing with the rotating load. As long as a rotating load exists, whirl exists; if the shaft rotation speed is 2 times the load rotation speed, then the eccentricity reaches the maximum.</p>
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Lim, C. C. "The Super- and Sub-Rotation of Barotropic Atmospheres on a Rotating Planet". Nelineinaya Dinamika 18, n.º 1 (2022): 19–42. http://dx.doi.org/10.20537/nd220102.

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A statistical mechanics canonical spherical energy-enstrophy theory of the superrotation phenomenon in a quasi-2D barotropic fluid coupled by inviscid topographic torque to a rotating solid body is solved in closed form in Fourier space, with inputs on the value of the energy to enstrophy quotient of the fluid, and two planetary parameters — the radius of the planet and its rate and the axis of spin. This allows calculations that predict the following physical consequences: (A) two critical points associated with the condensation of high and low energy (resp.) states in the form of distinct superrotating and subrotating (resp.) solid-body flows, (B) only solid-body flows having wavenumbers $l=1$, $m=0$ — tiltless rotations — are excited in the ordered phases, (C) the asymmetry between the superrotating and subrotating ordered phases where the subrotation phase transition also requires that the planetary spin is sufficiently large, and thus, less commonly observed than the superrotating phase, (D) nonexcitation of spherical modes with wavenumber $l>1$ in barotropic fluids. Comparisons with other canonical, microcanonical and dynamical theories suggest that this theory complements and completes older theories by predicting the above specific outcomes.
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Jose, Sharath y Rama Govindarajan. "Non-normal origin of modal instabilities in rotating plane shear flows". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 476, n.º 2233 (enero de 2020): 20190550. http://dx.doi.org/10.1098/rspa.2019.0550.

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Small variations introduced in shear flows are known to affect stability dramatically. Rotation of the flow system is one example, where the critical Reynolds number for exponential instabilities falls steeply with a small increase in rotation rate. We ask whether there is a fundamental reason for this sensitivity to rotation. We answer in the affirmative, showing that it is the non-normality of the stability operator in the absence of rotation which triggers this sensitivity. We treat the flow in the presence of rotation as a perturbation on the non-rotating case, and show that the rotating case is a special element of the pseudospectrum of the non-rotating case. Thus, while the non-rotating flow is always modally stable to streamwise-independent perturbations, rotating flows with the smallest rotation are unstable at zero streamwise wavenumber, with the spanwise wavenumbers close to that of disturbances with the highest transient growth in the non-rotating case. The instability critical rotation number scales inversely as the square of the Reynolds number, which we demonstrate is the same as the scaling obeyed by the minimum perturbation amplitude in non-rotating shear flow needed for the pseudospectrum to cross the neutral line. Plane Poiseuille flow and plane Couette flow are shown to behave similarly in this context.
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Collier Cameron, A. "Differential rotation on rapidly rotating stars". Astronomische Nachrichten 328, n.º 10 (diciembre de 2007): 1030–33. http://dx.doi.org/10.1002/asna.200710880.

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Tesis sobre el tema "Rotating"

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Whitlow, C. D. "Rotating and non-rotating flows of internally heated fluids". Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375519.

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Rump, Owen James. "Non-rotating and rotating free surface flows over topography". Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1446071/.

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An important effect in atmosphere and ocean dynamics is the drag exerted by topography, in the form of mountain ranges and individual mountains, on incident flows. Because the scale of topographic variations are usually small compared to the resolution of global-scale numerical models, drag effects must often be parameterised. This thesis aims to understand topographic drag in highly idealised numerical models with a view to demonstrating where efforts in parameterisation may be best directed. Specifically, the thesis considers single-layer and one and one half layered flow (where a single layer lies below an infinitely deep layer of slightly lower density) over topography, inspired by a series of rotating tank experiments. The flow behaviour is strongly affected by the Proude number F of the flow - the ratio of the oncoming flow to the speed of long free gravity waves. The transcritical regime F 1, in which there is a close analogy with compressible gas dynamics, is investigated as a novel limit of the Shallow-Water Equations. Scaling laws for the drag are verified against numerical integrations and various flow regimes for rotating and non-rotating flows delineated. Supercritical flow {F > 1) is also investigated, focusing on both the drag and breaking waves in the far-field, which in the rotating case is shown to depend on a single parameter.
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Seshasayanan, Kannabiran. "Rotating turbulent dynamos". Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066158/document.

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Dans cette thèse, nous étudions l’effet de la turbulence en rotation sur l’instabilité dynamo. Nous étudions les différentes limites de la turbulence en rotation numériquement et théoriquement. D’abord, nous avons considéré l’effet dynamo engendré par les écoulements quasi-bidimensionnel (un écoulement avec trois composantes de vitesse qui dépendent de deux directions), qui modélise la limite de rotation très rapide. Nous avons étudié l’amplitude de saturation du champ magnétique en fonction du nombre de Prandt magnétique pour ce type d’écoulement. Un modèle théorique est développé et comparé avec les résultats numériques. Nous avons aussi regardé l’effet d’une vitesse bruitée sur le taux de croissance des différents moments du champ magnétique. Nous avons étudié l’écoulement 3D en rotation globale pour différents régimes du paramètre de contrôle. Pour l’écoulement hydrodynamique, nous avons étudié la transition vers une cascade inverse et les différents types de saturation de la cascade inverse. Nous avons regardé l’instabilité dynamo de ces écoulements. Nous avons montré que la rotation modifie le mode le plus instable et dans certains cas peut réduire le seuil de l’instabilité dynamo
In this thesis, we study the effect of rotating turbulent flows on the dynamo instability. We study the different limits of rotating turbulence using numerical simulations and theoretical tools. We first look at the dynamo instability driven by quasi-twodimensional flows (flows with three components varying along two directions), which models the limit of very fast rotation. We look at the saturation amplitude of the magnetic field as a function of the magnetic Prandtl number for such flows. A theoretical model for the dynamo instability is later developed and compared with the numerical results. We also study the effect of a fluctuating velocity field on the growth rate of different moments of the magnetic field. The three dimensional rotating flow is then studied for different range of parameters. For the hydrodynamic problem, we study the transition to an inverse cascade and the different saturation mechanism of the inverse cascade. Later the dynamoinstability driven by such flows is investigated. We show that the effect of rotation modifies the most unstable mode and in some cases can reduce the dynamo threshold
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Moss, T. R. "Rotating machinery reliability". Thesis, Loughborough University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311046.

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Yang, Chunping. "Rotating Drum Biofiltration". University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092668752.

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Granfeldt, Caroline. "Rotating Workforce Scheduling". Thesis, Linköpings universitet, Optimeringslära, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122507.

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Several industries use what is called rotating workforce scheduling. This often means that employees are needed around the clock seven days a week, and that they have a schedule which repeats itself after some weeks. This thesis gives an introduction to this kind of scheduling and presents a review of previous work done in the field. Two different optimization models for rotating workforce scheduling are formulated and compared, and some examples are created to demonstrate how the addition of soft constraints to the models affects the scheduling outcome. Two large realistic cases, with constraints commonly used in many industries, are then presented. The schedules are in these cases analyzed in depth and evaluated. One of the models excelled as it provides good results within a short time limit and it appears to be a worthy candidate for rotating workforce scheduling.
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Ahn, Jaeyong. "Film cooling effectiveness measurements on rotating and non-rotating turbine components". Texas A&M University, 2005. http://hdl.handle.net/1969.1/4664.

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Detailed film cooling effectiveness distributions were measured on the stationary blade tip and on the leading edge region of a rotating blade using a Pressure Sensitive Paint technique. Air and nitrogen gas were used as the film cooling gases and the oxygen concentration distribution for each case was measured. The film cooling effectiveness information was obtained from the difference of the oxygen concentration between air and nitrogen gas cases by applying the mass transfer analogy. In the case of the stationary blade tip, plane tip and squealer tip blades were used while the film cooling holes were located (a) along the camber line on the tip or (b) along the span of the pressure side. The average blowing ratio of the cooling gas was controlled to be 0.5, 1.0, and 2.0. Tests were conducted in a five-bladed linear cascade with a blow down facility. The free stream Reynolds number, based on the axial chord length and the exit velocity, was 1,100,000 and the inlet and the exit Mach number were 0.25 and 0.59, respectively. Turbulence intensity level at the cascade inlet was 9.7%. All measurements were made at three different tip gap clearances of 1%, 1.5%, and 2.5% of blade span. Results show that the locations of the film cooling holes and the presence of squealer have significant effects on surface static pressure and film-cooling effectiveness. Same technique was applied to the rotating turbine blade leading edge region. Tests were conducted on the first stage rotor of a 3-stage axial turbine. The Reynolds number based on the axial chord length and the exit velocity was 200,000 and the total to exit pressure ratio was 1.12 for the first rotor. The effects of the rotational speed and the blowing ratio were studied. The rotational speed was controlled to be 2400, 2550, and 3000 rpm and the blowing ratio was 0.5, 1.0, and 2.0. Two different film cooling hole geometries were used; 2-row and 3-row film cooling holes. Results show that the rotational speed changes the directions of the coolant flows. Blowing ratio also changes the distributions of the coolant flows. The results of this study will be helpful in understanding the physical phenomena regarding the film injection and designing more efficient turbine blades.
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Mehdigholi, Hamid. "Forced vibration of rotating discs and interaction with non-rotating structures". Thesis, Imperial College London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445321.

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Kryeziu, O. "Rotating and non-rotating flows through gaps by the hodograph method". Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1310257/.

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Steady, two-dimensional flows of a single layer of inviscid fluid discharging through an aperture are treated in the hodograph or velocity plane on a rectangular grid. The following problems are considered individually: irrotational planar and axisymmetric flow of air through a nozzle, incompressible flow through an aperture with bottom topography and lastly rotating flow of a uniform potential vorticity fluid issuing from a passage on the wall. The rotating case differs from other cases in that three parameters are required to describe the solutions instead of two. In all cases the problems are formulated so that flows range from subcritical to supercritical including choked flow. The rectangular domain for the supercritical problems results from the way the information travels in the hodograph plane in the region that is image of the flow that occurs around the lip of the nozzle wall. Supercritical jets are solved up to a short distance away from the aperture, hence shocks that occur further downstream are avoided although limiting lines develop in the vicinity of the exit plane depending on the strength of the topography. The equations governing irrotational flows are expressed in terms of the Legendre potential and those for the rotating flow are expressed in terms of the streamfunction. Solutions of these equations are computed using standard finite-differences approximations. Knowledge of the characteristics directions and the corresponding compatibility equations in the supercritical region of the domain is not required which demonstrates the robustness of solving in the hodograph plane. All that is necessary is that the general direction in which information propagates is perceived so that explicit or implicit finite-differences can be employed.
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Vestman, Christopher. "The rotation of a stored cylinder body by an outer rotating structure". Thesis, Luleå tekniska universitet, Rymdteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-75021.

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HEAT-grenades are wing-stabilized grenades using shaped charge technology. Theshaped charge is a method, producing a jet-beam, with the use of a copper linerin which the aim is to focus the detonation energy to be able to penetrate armourand structures. This jet-beam is only eective under a rotational frequency of 15Hz, any frequency above this and the produced jet-beam loses its eciency and willnot be able to penetrate its target. One approach to minimize the inner body'srotation is by using bearings. By the use of ball bearings the intention is to with-hold transferring the angular momentum from the outer rotating body to the innercylinder body. This thesis have been analysing how much rotation the warhead haveacquired from the outer rotation of the grenade divided in an acceleration phase anda ying phase. During the acceleration phase the rotation of the warhead is reach-ing a frequency of 0.35 Hz. Proposals are presented for improving and lowering therotational speeds for future studies.
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Libros sobre el tema "Rotating"

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Pratt, Larry J. y John A. Whitehead. Rotating Hydraulics. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-49572-9.

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Sulaiman, Shaharin Anwar, ed. Rotating Machineries. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-2357-7.

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service), ScienceDirect (Online, ed. Rotating flow. Amsterdam: Elsevier, 2011.

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Perez, Robert X. y Andrew P. Conkey. Troubleshooting Rotating Machinery. Hoboken, NJ, USA: John Wiley &;#38; Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119294443.

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Le Doeuff, René y Mohamed El Hadi Zaïm. Rotating Electrical Machines. Hoboken, NJ USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118620649.

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Adams, Maurice L. Rotating Machinery Vibration. New York: Marcel Dekker, Inc., 2003.

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University of Natal. Indicator Project South Africa. y University of Natal. Dept. of Geographical & Environmental Sciences., eds. Rotating the cube. Durban: Dept. of Geographical & Environmental Sciences [and] Indicator Project South Africa, University of Natal, 1990.

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Li, Hua. Rotating shell dynamics. Amsterdam: Elsevier, 2005.

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United States. Environmental Protection Agency. Office of Emergency and Remedial Response., ed. Rotating biological contactors. Washington, D.C: U.S. Environmental Protection Agency, Office of Emergency and Remedial Response, 1992.

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Conference on Mechanical Vibration and Noise (12th 1989 Montreal, Quebec). Rotating machinery dynamics. New York, N.Y. (345 E. 47th St., New York 10017): American Society of Mechanical Engineers, 1989.

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Capítulos de libros sobre el tema "Rotating"

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Weik, Martin H. "rotating". En Computer Science and Communications Dictionary, 1502. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_16481.

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Aftalion, Amandine. "ROTATING". En Copernicus Books, 113–35. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-54082-0_5.

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Muthanandan, Sundralingam y Khairul Anwar B. M. Nor. "Condition Monitoring and Assessment for Rotating Machinery". En Rotating Machineries, 1–22. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2357-7_1.

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Baharom, M. B. y M. Azrul Nizam B. M. Zahir. "Turnaround Activities of Rotating Machinery for Mechanical Engineers". En Rotating Machineries, 23–42. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2357-7_2.

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Amin Abd Majid, Mohd y Ismady Ismail. "Localization of Gas Turbine Maintenance by Malaysian Gas Turbine Owners and Operators". En Rotating Machineries, 43–51. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2357-7_3.

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Mokhtar, Ainul Akmar, Freselam Mulubran y Masdi Muhammad. "Probabilistic Life Cycle Costing: A Case Study of Centrifugal Pumps". En Rotating Machineries, 53–71. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2357-7_4.

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Baheta, A. T., K. P. Leong, Shaharin Anwar Sulaiman y A. D. Fentaye. "CFD Analysis of Fouling Effects on Aerodynamics Performance of Turbine Blades". En Rotating Machineries, 73–84. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2357-7_5.

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Nasif, Mohammad Shakir. "Electrohydrodynamic Pumps for Dielectric Liquid Application". En Rotating Machineries, 85–92. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2357-7_6.

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Hassan, Suhaimi y Hamdan Ya. "Experimental Study on Electrical Power Generation from a 1-kW Engine Using Simulated Biogas Fuel". En Rotating Machineries, 93–104. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2357-7_7.

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Ptitsyn, Vadim. "Rotators and Snakes". En Polarized Beam Dynamics and Instrumentation in Particle Accelerators, 83–111. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-16715-7_4.

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AbstractThis lecture introduces various kinds of spin rotating devices used in present particle accelerators. They include Siberian Snakes used for polarization preservation and spin rotators used for creating a specific polarization orientation in experimental locations. Following the analysis of spin rotation in different types of magnets, approaches for designing spin rotating devices are discussed. Considerations for appropriate design choices of spin rotating devices in dependence on the beam energy are given. Examples of Snakes and spin rotators used in past accelerators as well as designs considered for future ones are presented.
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Actas de conferencias sobre el tema "Rotating"

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Kim, Suhyun y Soo-Mook Moon. "Rotating register allocation with multiple rotating branches". En the 22nd annual international conference. New York, New York, USA: ACM Press, 2008. http://dx.doi.org/10.1145/1375527.1375563.

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AMBRUŞ, VICTOR E. y ELIZABETH WINSTANLEY. "ROTATING FERMIONS". En Proceedings of the MG13 Meeting on General Relativity. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814623995_0330.

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van Enk, S. J. y G. Nienhuis. "Rotating photons". En Integrated Optoelectronic Devices 2008, editado por David L. Andrews, Enrique J. Galvez y Gerard Nienhuis. SPIE, 2008. http://dx.doi.org/10.1117/12.765476.

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Yamamoto, Arata. "Rotating lattice". En 31st International Symposium on Lattice Field Theory LATTICE 2013. Trieste, Italy: Sissa Medialab, 2014. http://dx.doi.org/10.22323/1.187.0351.

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Chin, Siu A. "SIMULATING ROTATING BEC: VORTICES FORMATION AND OVER-CRITICAL ROTATIONS". En Proceedings of the 14th International Conference. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812779885_0027.

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Sanders, G. A., R. B. Smith y G. F. Rouse. "Novel Polarization-Rotating Fiber Resonator For Rotation Sensing Applications". En OE/FIBERS '89, editado por Ramon P. DePaula y Eric Udd. SPIE, 1990. http://dx.doi.org/10.1117/12.963055.

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Negreiros, Rodrigo y Fridolin Weber. "Thermal properties of Non-rotating and Rotating Neutron Stars". En 10th Symposium on Nuclei in the Cosmos. Trieste, Italy: Sissa Medialab, 2009. http://dx.doi.org/10.22323/1.053.0187.

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Lengyel-Kampmann, Timea, Christian Voß, Eberhard Nicke, Klaus-Peter Rüd y Reinhold Schaber. "Generalized Optimization of Counter-Rotating and Single-Rotating Fans". En ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26008.

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On possible fan concept for future high and ultra-high bypass ratio turbofan engines is the counter-rotating (CR) fan. Several studies [1][2][3][4] dealt already with the optimization of CR fans, however the mass flow and the total pressure ratio were typically given and fixed for a specified application. The results of these studies showed a benefit of the CR fan compared to the conventional single-rotating (SR) fan, which strongly depended on the engine cycle. Following this experience, it was necessary to further specify the efficiency benefits more precisely in association with fan total pressure ratio and fan inlet axial Mach number. The results are discussed in this present paper. A special emphasis was given on determining the optimal pressure ratio, for which the CR-fan expectably achieves the maximal efficiency benefit. The idea was to perform a global optimization study without any constraints for the operating point inside of a broad (ΠFan, Max) –range, for the rotational speeds and with only a few constraints for the geometry of the blades to avoid infeasible geometries. An adequate range for the fan pressure ratio (ΠFan) and for the axial Mach number (Max) was chosen for the global optimization covering the entire range from current to potential future ultra-high bypass ratio engine applications, also taking into account a reduced nacelle diameter and thus high axial fan inflow Mach numbers. The focus of the present study was to develop a method for the global optimization of a fan stage. As a result of this study, the maximal achievable efficiency is shown as a function of the fan pressure ratio and the axial Mach number. Thus the efficiency differences between the CR and SR fan can be calculated through the differences between the surfaces for any given set of parameters defining a potential engine. This allows for a generalized assessment of this particular fan concept over the entire range of relevant applications.
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Fujioka, Yasuo y Tomotsugu Sakai. "Rotating Loosening Mechanism of Nut Connecting Rotary Disc Under Rotating-Bending Force". En ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42215.

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There are fastened structures composed of rotary disc and shaft, which are fastened with bolts and nuts with tapered bearing surfaces. Those are loaded with rotating-bending force. It has been difficult to explain clearly the rotating loosening mechanism of such joint’s nuts by the previously proposed mechanism. In this study, the rotating mechanism of this nut was investigated from theoretical and experimental view points. Finally two types of mechanisms were derived. One is as follows: High pressure contact area is formed by external load oriented in the radial direction of a disc. It gives very small difference of radii between the bearing surface of disc and that of nut. Then, with the revolution of the disc, it makes occurrence of two friction torques in opposite direction, which are Tw and Ts torques on bearing and on threads respectively. When revolving disc, relative rotating direction of nut is dominated by bigger torque of Tw and Ts. If Tw is bigger than Ts, the rotating direction of nut is the same as the disc revolution. If Ts is bigger than Tw, the rotating direction is opposite to disc revolving direction. Taking into consideration this mechanism, some tests were carried out by changing magnitude of the friction coefficients both of bearing surface and of threads surface with greasing and degreasing intentionally. Loosening and tightening rotations were confirmed to occur just as predicted from the above mentioned mechanism. The other is due to the eccentricities caused by dimensional errors around the bolt, the nut and the tapered bearing surface of rotary disc. In this case, the direction of the force transmitted through the high pressure contact area changes from the center of bolt axis. So, the transmitted force can cause the torque which loosens and tightens the nut during one revolution of rotary disc, therefore relative rotation of nut results in small fluctuating of loosening and tightening. Combining two types of mechanisms, repeating small angle of loosening and tightening, nuts are rotated inclined to loosening or tightening direction after many revolutions of disc.
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Ma, Nancy, John S. Walker y Laurent Martin Witkowski. "Thermocapillary Instability With a Rotating Magnetic Field and System Rotation". En ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43131.

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This paper presents a linear stability analysis for the thermocapillary convection in a liquid bridge bounded by two planar liquid-solid interfaces at the same temperature and by a cylindrical free surface with an axisymmetric heat input. The two solid boundaries are rotated at the same angular velocity in one azimuthal direction, and a rotating magnetic field is applied in the opposite azimuthal direction. The critical values of the Reynolds number for the thermocapillary convection and the critical-mode frequencies are presented as functions of the magnetic Taylor number for the rotating magnetic field and of the Reynolds number for the angular velocity of the solid boundaries.
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Informes sobre el tema "Rotating"

1

Ohlsen, Daniel R. y John E. Hart. Rotating Exchange Flow. Fort Belvoir, VA: Defense Technical Information Center, septiembre de 1997. http://dx.doi.org/10.21236/ada628932.

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Ohlsen, Daniel R. y John E. Hart. Rotating Exchange Flow. Fort Belvoir, VA: Defense Technical Information Center, enero de 1998. http://dx.doi.org/10.21236/ada357619.

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Lim, Chjan. Dynamics and Statistical Mechanics of Rotating and non-Rotating Vortical Flows. Office of Scientific and Technical Information (OSTI), diciembre de 2013. http://dx.doi.org/10.2172/1110818.

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Weber, Justin. Rotating Detonation Engine Introduction. Office of Scientific and Technical Information (OSTI), septiembre de 2021. http://dx.doi.org/10.2172/1871020.

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Kiedron, P., J. Schlemmer y M. Klassen. Rotating Shadowband Spectroradiometer (RSS) Handbook. Office of Scientific and Technical Information (OSTI), enero de 2005. http://dx.doi.org/10.2172/1020275.

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Keyvani, M. y N. C. Gardner. Operating characteristics of rotating beds. Office of Scientific and Technical Information (OSTI), enero de 1988. http://dx.doi.org/10.2172/7279454.

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Reusch, M. F. y K. Jayaram. A rotating arc plasma invertor. Office of Scientific and Technical Information (OSTI), febrero de 1987. http://dx.doi.org/10.2172/6636612.

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Montgomery, Robert S. Wear of Projectile Rotating Bands. Fort Belvoir, VA: Defense Technical Information Center, marzo de 1985. http://dx.doi.org/10.21236/ada156666.

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Govindan, T. R., F. J. De Jong, W. R. Briley y H. McDonald. Rotating Flow in Radial Turbomachinery. Fort Belvoir, VA: Defense Technical Information Center, mayo de 1990. http://dx.doi.org/10.21236/ada222885.

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Gardner, N., M. Keyvani y A. Coskundeniz. Flue gas desulfurization by rotating beds. Office of Scientific and Technical Information (OSTI), enero de 1992. http://dx.doi.org/10.2172/7170260.

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