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Добірка наукової літератури з теми "Rotating field"

Автор: Grafiati

Опубліковано: 16 вересня 2023

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Статті в журналах з теми "Rotating field"

1

Shibahashi, H., and M. Takata. "Pulsation of Rotating Magnetic Stars." International Astronomical Union Colloquium 139 (1993): 134. http://dx.doi.org/10.1017/s0252921100117117.

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Recently, one of the rapidly oscillating Ap stars, HR 3831, has been found to have an equally split frequency septuplet, though its oscillation seems to be essentially an axisymmetric dipole mode with respect to the magnetic axis which is oblique to the rotation axis (Kurtz et al. 1992; Kurtz 1992). In order to explain this fine structure, we investigate oscillations of obliquely rotating magnetic stars by taking account of the perturbations due to the magnetic fields and the rotation. We suppose that the star is rigidly rotating and that the magnetic field is a dipole field and its axis is oblique to the rotation axis. We treat the effects of the rotation and of the magnetic field as perturbations. In doing so, we suppose that the rotation of the star is slow enough so that the effect of the rotation on oscillations is smaller than that of the magnetic field.

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2

Miguel, M. C., and J. M. Rubı́. "Rotating Magnetic Field-Induced Rotations of Magnetic Holes." Journal of Colloid and Interface Science 172, no. 1 (June 1995): 214–21. http://dx.doi.org/10.1006/jcis.1995.1245.

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3

Reiners, Ansgar. "Magnetic Fields in Low-Mass Stars: An Overview of Observational Biases." Proceedings of the International Astronomical Union 9, S302 (August 2013): 156–63. http://dx.doi.org/10.1017/s1743921314001963.

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AbstractStellar magnetic dynamos are driven by rotation, rapidly rotating stars produce stronger magnetic fields than slowly rotating stars do. The Zeeman effect is the most important indicator of magnetic fields, but Zeeman broadening must be disentangled from other broadening mechanisms, mainly rotation. The relations between rotation and magnetic field generation, between Doppler and Zeeman line broadening, and between rotation, stellar radius, and angular momentum evolution introduce several observational biases that affect our picture of stellar magnetism. In this overview, a few of these relations are explicitly shown, and the currently known distribution of field measurements is presented.

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4

Co, Raymond T., Keisuke Harigaya, and Aaron Pierce. "Cosmic perturbations from a rotating field." Journal of Cosmology and Astroparticle Physics 2022, no. 10 (October 1, 2022): 037. http://dx.doi.org/10.1088/1475-7516/2022/10/037.

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Abstract Complex scalar fields charged under approximate U(1) symmetries appear in well-motivated extensions of the Standard Model. One example is the field that contains the QCD axion field associated with the Peccei-Quinn symmetry; others include flat directions in supersymmetric theories with baryon, lepton, or flavor charges. These fields may take on large values and rotate in field space in the early universe. The relevant approximate U(1) symmetry ensures that the angular direction of the complex field is light during inflation and that the rotation is thermodynamically stable and is long-lived. These properties allow rotating complex scalar fields to naturally serve as curvatons and explain the observed perturbations of the universe. The scenario imprints non-Gaussianity in the curvature perturbations, likely at a level detectable in future large scale structure observations. The rotation can also explain the baryon asymmetry of the universe without producing excessive isocurvature perturbations.

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5

Guo, Hao, Hyeon-Jung Kim, and Sang-Young Kim. "Research on Hydrogen Production by Water Electrolysis Using a Rotating Magnetic Field." Energies 16, no. 1 (December 21, 2022): 86. http://dx.doi.org/10.3390/en16010086.

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In this paper, the effect of rotating magnetic fields on hydrogen generation from water electrolysis is analyzed, aiming to provide a research reference for hydrogen production and improving hydrogen production efficiency. The electrolytic environment is formed by alkaline solutions and special electrolytic cells. The two electrolytic cells are connected to each other in the form of several pipes. The ring magnets are used to surround the pipes and rotate the magnets so that the pipes move relative to the magnets within the ring magnetic field area. Experimentally, the electrolysis reaction of an alkaline solution was studied by using a rotating magnetic field, and the effect of magnetic field rotation speed on the electrolysis reaction was analyzed using detected voltage data. The experimental phenomenon showed that the faster the rotation speed of the rotating magnetic field, the faster the production speed of hydrogen gas.

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6

Matos, Tonatiuh, and Darío Núñez. "Rotating scalar field wormhole." Classical and Quantum Gravity 23, no. 13 (June 12, 2006): 4485–95. http://dx.doi.org/10.1088/0264-9381/23/13/012.

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7

Диканский, Ю. И., М. А. Беджанян, А. А. Колесникова, А. Ю. Гора та А. В. Чернышев. "Динамические эффекты в магнитной жидкости с микрокаплями концентрированной фазы во вращающемся магнитном поле". Журнал технической физики 89, № 3 (2019): 373. http://dx.doi.org/10.21883/jtf.2019.03.47171.242-18.

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AbstractVariation in the shape of microdrops of a highly concentrated magnetic colloid resulting from phase separation in a magnetic fluid has been studied. It has been found that even weak magnetic fields (such as those comparable to the geomagnetic field) substantially influence the geometry and behavior of microdrops. Different configurations of microdrops in a rotating magnetic field have been considered. The occurrence of a rotation moment that acts on a macrodrop of a magnetic fluid in a rotating magnetic field has been shown. The rotation moment is due to the rotation of concentrated phase microdrops inside the macrodrop. The macroscopic rotation frequency of a drop’s surface as a function of the applied magnetic field frequency and strength has been measured.

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8

Vargas-Rodríguez, H., A. Gallegos, M. A. Muñiz-Torres, H. C. Rosu, and P. J. Domínguez. "Relativistic Rotating Electromagnetic Fields." Advances in High Energy Physics 2020 (December 29, 2020): 1–17. http://dx.doi.org/10.1155/2020/9084046.

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In this work, we consider axially symmetric stationary electromagnetic fields in the framework of special relativity. These fields have an angular momentum density in the reference frame at rest with respect to the axis of symmetry; their Poynting vector form closed integral lines around the symmetry axis. In order to describe the state of motion of the electromagnetic field, two sets of observers are introduced: the inertial set, whose members are at rest with the symmetry axis; and the noninertial set, whose members are rotating around the symmetry axis. The rotating observers measure no Poynting vector, and they are considered as comoving with the electromagnetic field. Using explicit calculations in the covariant 3 + 1 splitting formalism, the velocity field of the rotating observers is determined and interpreted as that of the electromagnetic field. The considerations of the rotating observers split in two cases, for pure fields and impure fields, respectively. Moreover, in each case, each family of rotating observers splits in two subcases, due to regions where the electromagnetic field rotates with the speed of light. These regions are generalizations of the light cylinders found around magnetized neutron stars. In both cases, we give the explicit expressions for the corresponding velocity fields. Several examples of relevance in astrophysics and cosmology are presented, such as the rotating point magnetic dipoles and a superposition of a Coulomb electric field with the field of a point magnetic dipole.

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9

Watterson, Peter A. "Analytical solutions for the current driven by a rotating magnetic field in a spherical plasma." Journal of Plasma Physics 46, no. 2 (October 1991): 271–98. http://dx.doi.org/10.1017/s0022377800016111.

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The steady currents driven in a spherical plasma by a rotating magnetic field via the Hall effect are studied analytically. The total field is shown to be symmetric across the origin. Integral relationships are obtained between Ohmic dissipation, angular momentum and the oscillating axial current density. The topology of the sum of a Hill's vortex field and a rotating field is documented. Analytical solutions for the driven current are obtained by expansion for the limits corresponding to small rotation frequency, to small number density, to large rotating-field magnitude, to small resistivity, and to small rotating-field magnitude combined with very small resistivity. The latter solution, relevant to the reactor limit, indicates that, with control of the vertical field magnitude, an MHD equilibrium can be generated with total current any fraction of the currentcorresponding to synchronous rotation of the electrons. Oscillating currents sufficient to drive the synchronous current are determined.

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10

Ayadi, Badreddine, Fatih Selimefendigil, Faisal Alresheedi, Lioua Kolsi, Walid Aich, and Lotfi Ben Said. "Jet Impingement Cooling of a Rotating Hot Circular Cylinder with Hybrid Nanofluid under Multiple Magnetic Field Effects." Mathematics 9, no. 21 (October 24, 2021): 2697. http://dx.doi.org/10.3390/math9212697.

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The cooling performance of jet impinging hybrid nanofluid on a rotating hot circular cylinder was numerically assessed under the effects of multiple magnetic fields via finite element method. The numerical study was conducted for different values of Reynolds number (100≤Re≤300), rotational Reynolds number (0≤Rew≤800), lower and upper domain magnetic field strength (0≤Ha≤20), size of the rotating cylinder (2 w ≤r≤ 6 w) and distance between the jets (6 w ≤ H ≤ 16 w). In the presence of rotation at the highest speed, the Nu value was increased by about 5% when Re was increased from Re = 100 to Re = 300. This value was 48.5% for the configuration with the motionless cylinder. However, the rotations of the cylinder resulted in significant heat transfer enhancements in the absence or presence of magnetic field effects in the upper domain. At Ha1 = 0, the average Nu rose by about 175%, and the value was 249% at Ha1 = 20 when cases with the cylinder rotating at the highest speed were compared to the motionless cylinder case. When magnetic field strengths of the upper and lower domains are reduced, the average Nu decreases. The size of the cylinder is influential on the flow dynamics and heat transfer when the cylinder is rotating. An optimum value of the distance between the jets was obtained at H = 14 w, where the Nu value was highest for the rotating cylinder case. A modal analysis of the heat transfer dynamics was performed with the POD technique. As diverse applications of energy system technologies with impinging jets are available, considering the rotations of the cooled surface under the combined effects of using magnetic field and nanoparticle loading in heat transfer fluid is a novel contribution. The outcomes of the present work will be helpful in the initial design and optimization studies in applications from electronic cooling to convective drying, solar power and many other systems.

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Дисертації з теми "Rotating field"

1

Short, David James. "Swirling flow induced by a rotating magnetic field." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338644.

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2

Ferreira, Hugo Ricardo Colaço. "Quantum field theory on rotating black hole spacetimes." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/29626/.

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This thesis is concerned with the development of a general method to compute renormalised local observables for quantum matter fields, in a given quantum state, on a rotating black hole spacetime. The rotating black hole may be surrounded by a Dirichlet mirror, if necessary, such that a regular, isometry-invariant vacuum state can be defined. We focus on the case of a massive scalar field on a (2+1)-dimensional rotating black hole, but the method can be extended to other types of matter fields and higher-dimensional rotating black holes. The Feynman propagator of the matter field in the regular, isometry-invariant state is written as a sum over mode solutions on the complex Riemannian section of the black hole. A Hadamard renormalisation procedure is implemented at the level of the Feynman propagator by expressing its singular part as a sum over mode solutions on the complex Riemannian section of rotating Minkowski spacetime. This allows us to explicitly renormalise local observables such as the vacuum polarisation of the quantum field. The method is applied to the vacuum polarisation of a real massive scalar field on a (2+1)-dimensional warped AdS3 black hole surrounded by a mirror. Selected numerical results are presented, demonstrating the numerical efficacy of the method. The existence of classical superradiance and the classical linear mode stability of the warped AdS3 black hole to massive scalar field perturbations are also analysed.

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3

Yamada, Satoru. "Field Ionization Processes of Highly Excited Rydberg States under a Rotating Electric Field." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/147813.

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4

Miller, Kenneth Elric. "The star thrust experiment, rotating magnetic field current drive in the field reversed configuration /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/9996.

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5

Peter, Andrew Maxwell. "Paramagnetic spin-up of a field reversed configuration with rotating magnetic field current drive /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/9983.

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6

Simitev, Radostin D. "Convection and magnetic field generation in rotating spherical fluid shells." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=97154249X.

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7

Frierson, Robert V. Jr. "Spectroscopic diagnostics of a plasma in a rotating magnetic field." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/17236.

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8

Ghoshal, Probir Kumar. "AC loss characteristic of high-Tc superconductors in rotating magnetic field." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611582.

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9

Wongsa-Ngasri, Pisit. "Ohmic heating of biomaterials: peeling and effects of rotating electric field." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1078447669.

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10

Hird, Lee D. "Analysis of the flow field between two eccentric rotating cylinders in the presence of a slotted sleeve." Thesis, Curtin University, 1997. http://hdl.handle.net/20.500.11937/859.

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Overend et al [68] designed a viscometer to measure the viscosity of slurries that have a tendency to settle. This viscometer consists of a rotating ribbed rotor surrounded by a stationary slotted sleeve; this system is then placed eccentrically within an inclined rotating bowl. It, is claimed that this overcomes most of the difficulties encountered when attempting to obtain accurate measurements for these types of mixtures. If the mixture being sheared within the annulus does not represent the true composition of the slurry being, tested then the results are expected to be inaccurate. The presence of sediment at the bottom of the rotor or the formation of large masses of particles within the flow domain will affect the accuracy of the measurements obtained. This dissertation studies the amount of flow through the slotted sleeve and the region, or regions, of low shear rate within the flow domain. Assuming that end-effects are unimportant and that the slurries can be replaced by a single-phase fluid, three two-dimensional models are proposed. These models are designed to capture the large-slot construction of the sleeve and the, approximate, non-Newtonian behaviour of the slurries. The first two models solve analytically (using a regular perturbation scheme) and numerically (using a finite volume method) the moderate-and large-Reynolds-number flow, and the third model uses a finite volume method to study the flow patterns developed by pseudoplastic fluids. The results show that the mixing of the slurry is expected to be enhanced by moving the concentric system (i.e., the rotor and the slotted sleeve) close to the rotating bowl and using low to moderate speeds for the rotor and bowl. In addition, when the cylinders rotate in the same directions, two (counter-rotating) eddies are present within the flow domain; whereas, only one eddy (rotating counter-clockwise) is present when the cylinders rotate in opposite directions. The presence of eddies in the former situation inhibits the flow through the sleeve; while, for moderate rotorspeeds, the flow through the sleeve is enhanced in the latter. When the slurry assumed pseudoplastic, we observe a region of low shear rate located near the dividing streamline present within the flow field. The distribution of shear rate within the flow field is shown to be affected by factors such as the rate of diffusion of the apparent viscosity and the value of the power law index. Therefore, this study suggests that for certain types of slurries, concentrations of particles exist within the domain and that the mixing of slurries can be impeded by the presence of eddies within the main flow field.

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Книги з теми "Rotating field"

1

Reddish, Vincent C. The field of rotating masses. Edinburgh: Makar Pub., 2010.

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2

K, Mazuruk, ed. Flow transitions in a rotating magnetic field. [Washington, D.C: National Aeronautics and Space Administration, 1997.

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3

K, Mazuruk, and United States. National Aeronautics and Space Administration., eds. Flow transitions in a rotating magnetic field. [Washington, D.C: National Aeronautics and Space Administration, 1997.

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4

Ostović, Vlado. The Art and Science of Rotating Field Machines Design: A Practical Approach. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39081-9.

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5

Law, Hillary June. The effects of a rotating circumcerebral magnetic field upon hypnotizability and subjective experiences: Does expectancy make a difference? Sudbury, Ont: Laurentian University, Department of Psychology, 2002.

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6

Rotating fields in general relativity. Cambridge [Cambridgeshire]: Cambridge University Press, 1985.

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7

United States. National Aeronautics and Space Administration., ed. Annual performance report for analysis of plasma measurements for the geotail missions: NAG5-2371, period covered 1 October 1993-30 September 1994. [Washington, DC: National Aeronautics and Space Administration, 1993.

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8

Aono, Osamu. Rotation of a magnetic field. Nagoya, Japan: Institute of Plasma Physics, Nagoya University, 1986.

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9

Dominion Experimental Farms and Stations (Canada), ed. Summary of results: Field husbandry, 1914. Ottawa: Dept. of Agriculture, 1997.

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10

Dominion Experimental Farms and Stations (Canada), ed. Summary of results: Field husbandry, 1913. Ottawa: Dept. of Agriculture, 1997.

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Частини книг з теми "Rotating field"

1

Gerling, Dieter. "Rotating Field Theory." In Electrical Machines, 89–134. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-17584-8_3.

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2

Zhang, Hong, William Tyzuk, Teresa Ho, Ernest Siu, C. Ronald Kube, Justin Gamble, and Steve Sutphen. "Rotating Sonar: Modeling and Application." In Field and Service Robotics, 515–20. London: Springer London, 1998. http://dx.doi.org/10.1007/978-1-4471-1273-0_77.

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3

Dolginov, A. Z. "Magnetic Field of Rotating Bodies." In Galactic and Intergalactic Magnetic Fields, 27–28. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0569-6_8.

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4

Yuhe, Tang, and Xu Kuangdi. "Permanent Rotating Magnetic Field Separator." In The ECPH Encyclopedia of Mining and Metallurgy, 1–3. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-0740-1_658-1.

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5

Evans, Myron W. "Maxwell’s Vacuum Field — a Rotating Charge." In The Enigmatic Photon, 295–305. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-010-9044-5_20.

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6

Cogotti, Antonello. "Flow Field Around a Rotating Wheel." In Flow Visualization VI, 284–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84824-7_48.

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7

Gerling, Dieter. "Permanent Magnet Excited Rotating Field Machines." In Electrical Machines, 219–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-17584-8_6.

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8

Lueptow, Richard M. "Stability and experimental velocity field in Taylor—Couette flow with axial and radial flow." In Physics of Rotating Fluids, 137–55. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-45549-3_9.

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9

Ostović, Vlado. "Thermal Design of Rotating Field Electric Machines." In The Art and Science of Rotating Field Machines Design: A Practical Approach, 377–409. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39081-9_7.

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10

Melkebeek, Jan A. "Ideal Current Supply of Rotating Field Machines." In Electrical Machines and Drives, 391–404. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72730-1_14.

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Тези доповідей конференцій з теми "Rotating field"

1

Yamamoto, Arata. "Rotating lattice." In 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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2

"Classical rotating field machines." In 2012 XXth International Conference on Electrical Machines (ICEM). IEEE, 2012. http://dx.doi.org/10.1109/icelmach.2012.6349829.

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3

"Classical Rotating Field Machines." In 2018 XIII International Conference on Electrical Machines (ICEM). IEEE, 2018. http://dx.doi.org/10.1109/icelmach.2018.8507062.

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4

Ma, Nancy, John S. Walker, and Laurent Martin Witkowski. "Thermocapillary Instability With a Rotating Magnetic Field and System Rotation." In 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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5

"Classical rotating field machines [breaker page]." In 2014 XXI International Conference on Electrical Machines (ICEM). IEEE, 2014. http://dx.doi.org/10.1109/icelmach.2014.6960151.

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6

Brand, A., J. Dekker, C. de Groot, M. Spaeth, A. Brand, J. Dekker, C. de Groot, and M. Spaeth. "Field rotor-aerodynamics - The rotating case." In 35th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-969.

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Davidovich, M. V. "On magnetic field of rotating bodies." In 2017 Radiation and Scattering of Electromagnetic Waves (RSEMW). IEEE, 2017. http://dx.doi.org/10.1109/rsemw.2017.8103566.

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8

Woods, Joshua M., Benjamin A. Jorns, and Alec Gallimore. "Scaling Laws of Rotating Magnetic Field Field-reversed Configuration Thrusters." In 2018 Joint Propulsion Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-4911.

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9

Bouamra, Messaoud, and Mustapha Merzouk. "Cosine Efficiency Distribution of Rotating Heliostat Field." In 2017 International Renewable and Sustainable Energy Conference (IRSEC). IEEE, 2017. http://dx.doi.org/10.1109/irsec.2017.8477337.

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10

Yasaka, Y., R. Majeski, J. Browning, N. Hershkowitz, and D. Roberts. "Rotating field antenna experiments in Phaedrus-B." In AIP Conference Proceedings Volume 159. AIP, 1987. http://dx.doi.org/10.1063/1.36685.

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Звіти організацій з теми "Rotating field"

1

Bieniosek, F. Beam-Sweep Magnet With Rotating Dipole Field. Office of Scientific and Technical Information (OSTI), June 1996. http://dx.doi.org/10.2172/1974002.

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2

Oz, E., C. E. Myers, M. R. Edwards, B. Berlinger, A. Brooks, and S. A. Cohen. Passive Superconducting Flux Conservers for Rotating-Magnetic-Field-Driven Field-Reversed Configurations. Office of Scientific and Technical Information (OSTI), January 2011. http://dx.doi.org/10.2172/1001679.

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3

Jachmann, Rebecca C. New Methodology For Use in Rotating Field Nuclear MagneticResonance. Office of Scientific and Technical Information (OSTI), January 2007. http://dx.doi.org/10.2172/918641.

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4

Jachmann, Rebecca C. New Methodology For Use in Rotating Field Nuclear MagneticResonance. Office of Scientific and Technical Information (OSTI), May 2007. http://dx.doi.org/10.2172/918669.

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5

S.A. Cohen, A. S. Landsman, and A. H. Glasser. Stochastic Ion Heating in a Field-reversed Configuration Geometry by Rotating Magnetic Fields. Office of Scientific and Technical Information (OSTI), June 2007. http://dx.doi.org/10.2172/963547.

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6

Alan H. Glasser and Samuel A. Cohen. Electron Acceleration in the Field-reversed Configuration (FRC) by Slowly Rotating Odd-parity Magnetic Fields. Office of Scientific and Technical Information (OSTI), April 2001. http://dx.doi.org/10.2172/786570.

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7

Samuel A. Cohen and Alan H. Glasser. Ion heating in the field-reversed configuration (FRC) by rotating magnetic fields (RMF) near cyclotron resonance. Office of Scientific and Technical Information (OSTI), July 2000. http://dx.doi.org/10.2172/758642.

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8

Lee, Jyeching, and Shana Groeschler. Transient Simulation of a Rotating Conducting Cylinder in a Transverse Magnetic Field. Fort Belvoir, VA: Defense Technical Information Center, September 2016. http://dx.doi.org/10.21236/ad1016771.

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9

Riley, Mark, and Akis Pipidis. The Mechanical Analogue of the "Backbending" Phenomenon in Nuclear-structure Physics. Florida State University, May 2008. http://dx.doi.org/10.33009/fsu_physics-backbending.

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Анотація:

This short pedagogical movie illustrates an effect in nuclear physics called backbending which was first observed in the study of the rotational behavior of rapidly rotating rare-earth nuclei in Stockholm, Sweden in 1971. The video contains a mechanical analog utilizing rare-earth magnets and rotating gyroscopes on a turntable along with some historic spectra and papers associated with this landmark discovery together with its explanation in terms of the Coriolis induced uncoupling and rotational alignment of a specific pair of particles occupying high-j intruder orbitals. Thus backbending represents a crossing in energy of the groundstate, or vacuum, rotational band by another band which has two unpaired high-j nucleons (two quasi-particles) with their individual angular momenta aligned with the rotation axis of the rapidly rotating nucleus. Backbending was a major surprise which pushed the field of nuclear structure physics forward but which is now sufficiently well understood that it can be used as a precision spectroscopic tool providing useful insight for example, into nuclear pairing correlations and changes in the latter due to blocking effects and quasi-particle seniority, nuclear deformation, the excited configurations of particular rotational structures and the placement of proton and neutron intruder orbitals at the Fermi surface.

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10

Tominaka, T. Data Analysis of the Magnetic Field Measurement of a Helical Dipole Prototype Magnet by the Rotating Coil. Office of Scientific and Technical Information (OSTI), September 1997. http://dx.doi.org/10.2172/1149847.

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