Relevant bibliographies by topics / Magnets – Viscosity

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Magnets – Viscosity'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Magnets – Viscosity"

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Martinez, J. C., and F. P. Missell. "MAGNETIC VISCOSITY IN NdFeB MAGNETS." Le Journal de Physique Colloques 49, no. C8 (December 1988): C8–649—C8–650. http://dx.doi.org/10.1051/jphyscol:19888294.

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Liu, Jinfang, Helie Luo, and Shuming Pan. "Magnetic viscosity studies of Nd16Fe77B7permanent magnets." Journal of Applied Physics 69, no. 8 (April 15, 1991): 5557–58. http://dx.doi.org/10.1063/1.347948.

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Martinez, J. C., and F. P. Missell. "Magnetic viscosity and texture in NdFeB magnets." Journal of Applied Physics 64, no. 10 (November 15, 1988): 5726–28. http://dx.doi.org/10.1063/1.342239.

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Skomski, R. "Magnetic Viscosity of Interacting Fine Particle Magnets." physica status solidi (b) 165, no. 1 (May 1, 1991): K27—K32. http://dx.doi.org/10.1002/pssb.2221650134.

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LoBue, M., V. Basso, G. Beatrice, C. Bertotti, G. Durin, and C. P. Sasso. "Barkhausen jumps and magnetic viscosity in NdFeB magnets." Journal of Magnetism and Magnetic Materials 290-291 (April 2005): 1184–87. http://dx.doi.org/10.1016/j.jmmm.2004.11.380.

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Givord, D., P. Tenaud, T. Viadieu, and G. Hadjipanayis. "Magnetic viscosity in different Nd‐Fe‐B magnets." Journal of Applied Physics 61, no. 8 (April 15, 1987): 3454–56. http://dx.doi.org/10.1063/1.338751.

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Thompson, P. J., and R. Street. "Viscosity, reptation and tilting effects in permanent magnets." Journal of Physics D: Applied Physics 30, no. 9 (May 7, 1997): 1273–84. http://dx.doi.org/10.1088/0022-3727/30/9/002.

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Givord, D., A. Lienard, P. Tenaud, and T. Viadieu. "Magnetic viscosity in Nd-Fe-B sintered magnets." Journal of Magnetism and Magnetic Materials 67, no. 3 (July 1987): L281—L285. http://dx.doi.org/10.1016/0304-8853(87)90185-5.

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Villas-Boas, V., J. M. Gonzalez, F. Cebollada, M. F. Rossignol, D. W. Taylor, and D. Givord. "Coercivity and magnetic viscosity of NdDyFeB mechanically alloyed magnets." IEEE Transactions on Magnetics 31, no. 6 (1995): 3647–49. http://dx.doi.org/10.1109/20.489597.

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Cornejo, D. R., V. Villas-Boas, and F. P. Missell. "Reversible processes and magnetic viscosity of nanocrystalline permanent magnets." Journal of Applied Physics 83, no. 11 (June 1998): 6637–39. http://dx.doi.org/10.1063/1.367784.

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Dissertations / Theses on the topic "Magnets – Viscosity"

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Harrison, Simon Andrew. "Characterisation of the mechanisms of magnetisation change in permanent magnet materials through the interpretation of hysteresis measurements." University of Western Australia. School of Physics, 2004. http://theses.library.uwa.edu.au/adt-WU2004.0048.

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The mechanisms by which magnetisation changes occur in magnetic materials may be investigated by a variety of hysteresis measurements. During this study both alternating and rotational hysteresis measurements were used to characterise the mechanisms of magnetisation change in a number of permanent magnet materials. Studies of the time dependence of magnetisation, remanent magnetisations and the dependence of the reversible magnetisation on the irreversible magnetisation were undertaken. These studies revealed that in sintered rare-earth iron magnets the magnetisation change is predominately controlled by domain nucleation, with a lesser contribution from domain wall pinning within the boundary regions of the grains. Similar mechanisms control the magnetisation change in the larger grains of melt-quenched rare-earth iron magnets. In the single domain grains of the melt-quenched materials incoherent rotation mechanisms control the changes of magnetisation. Magnetisation change in MnAlC and sintered AlNiCo was found to be controlled by domain wall pinning within the interior of the grains of the materials. Two devices were constructed for the measurement of rotational hysteresis. The first measures the angular acceleration of a sample set spinning in a magnetic field, from which the rotational hysteresis loss may be determined. The second employs rotating search coils to make direct measurements of the component of magnetisation that contributes to rotational hysteresis loss during the rotation of a sample in a field. Both devices were found to produce data consistent with that in the literature and to be useful for the characterisation of rotational hysteresis in permanent magnet materials. A simple model was used to examine the dependence of rotational hysteresis loss on various material parameters. It was found that the value of the rotational hysteresis integral is dependent on interactions and to a lesser extent distributions in anisotropy. This is contrary to assumptions commonly made in the literature but consistent with published experimental data, which has been reinterpreted. Measurements of rotational hysteresis losses in the materials studied were found to be effected by geometric demagnetisation effects. A method by which such data may be corrected for these effects is proposed. Following correction and consideration of the interactions within the materials, the rotational hysteresis data was found to be consistent with the characterisations performed in linearly alternating fields.
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Patel, Vijay. "Studies of magnetic viscosity in anisotropic materials." Thesis, Keele University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261526.

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Wang, Yingru. "Modeling of polymer melt/nanoparticle composites and magneto-rheological fluids." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1135877847.

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Maurer, Thomas. "Magnetism of anisotropic nano-objects : magnetic and neutron studies of Co1-xNix nanowires." Paris 11, 2009. http://www.theses.fr/2009PA112340.

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Le nanomagnétisme est actuellement un champ d'investigation très actif grâce aux développements de méthodes de synthèse et d'investigation originales. Cette thèse s'attache à sonder le magnétisme de nanofils magnétiques synthétisés par un procédé polyol. Ce procédé présente l'avantage de fournir un large éventail d'objets magnétiques anisotropes présentant une très bonne qualité cristalline. Les nanofils ainsi synthétisés présentent des diamètres variant de 7nm à 20nm, leur conférant un mode de renversement de l'aimantation cohérent. Cette thèse montre que les nanofils ainsi synthétisés ont des coercivités élevées comparées à celles de nanofils synthétisés par d'autres voies. Par ailleurs, les effets de l'oxydation de ces nanofils sur leurs propriétés magnétiques ont été étudiés. Les mesures magnétiques ont révélé une dépendance en température des champs d'échange et coercitif inhabituelle. Cela a permis de mettre en lumière le rôle prépondérant des fluctuations superparamagnétiques des grains antiferromagnétiques d'oxyde de cobalt dans le phénomène d'Exchange Bias. Enfin, cette thèse a aussi pour objectif de développer la technique de Diffusion de Neutrons Polarisés aux Petits Angles pour sonder le magnétisme de nanofils. Jusqu'à présent, cette technique a été surtout réservée à l'étude d'objets magnétiques isotropes. En effet, l'alignement des nanofils est crucial pour extraire des informations quantitatives d'une telle étude. C'est pour cela, qu'outre les nanofils synthétisés par procédé polyol, des nanofils inclus dans des matrices d'alumine poreuse ont aussi été étudiés par cette technique
Magnetism of individual nano-objects is a very active research field thanks to the development of original synthesis routes and investigation tools. This thesis aims at probing the magnetism of nanowires synthesized via a pure chemical route, the polyol process. This process provides a large variety and an excellent crystallinity of the synthesized nanowires. This process allows to tune the diameter of the nanowires from 7nm to 20nm leading to coherent magnetization reversaI in the nanowires. I show how the large shape and magnetocrystalline anisotropies provide large coercivities compared to magnetic nanowires synthesized via other routes. Furthermore, the oxidation of such objects has also been investigated. Magnetic measurements has revealed unsual temperature dependencies of both the coercive and exchange fields, emphasizing the role of the superparamagnetic fluctuations of the CoO antiferromagnetic grains in the Exchange Bias effect. Finally, this thesis also aims at developing Polarized Small Angle Neutron Scattering to probe magnetism in complex nano-objects. Such a technique has been ignored until now to study magnetic anisotropic nano-objects despite being well adapted. The key ingredient to carry through such a study is the perfect alignment of the nanowires. This is why, besides the nanowires synthesized via the polyol process, Polarized Small Angle neutron Scattering measurements have been performed on arrays of magnetic nanowires included in porous alumina membranes
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Senanayake, Tissa. "The influence of Hall currents, plasma viscosity and electron inertia on magnetic reconnection solutions." The University of Waikato, 2007. http://hdl.handle.net/10289/2593.

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Abstract This thesis examines magnetic reconnection in the solar corona. Magnetic reconnection is the only mechanism which allows the magnetic topology of magnetized plasmas to be changed. Many of the dynamic processes in the Sun's atmosphere are believed to be driven by magnetic reconnection and studying the behaviour of such phenomena is a key step to understanding the reconnection mechanism. In Chapters 1 to 3, we discuss the physical and mathematical framework on which current magnetohydrodynamic reconnection models are based. The aim of the thesis is to investigate theoretical models of magnetic reconnection using variety of analytic and numerical techniques within the theoretical frame work of magnetohydrodynamics (MHD). In Chapter 4 we use a line-tied X-point collapse model for compressible plasmas to investigate the role of viscosity on the energy release mechanism. This model also provides the basis for the investigation of Chapter 5 which explores the impact of Hall currents in the transient X-point energy dissipation. Chapter 6 is concerned with how reconnection is modified in the presence of generalized Ohm's law which includes both Hall current and electron inertia contributions. In contrast to the closed X-point collapse geometry adopted for compressible plasmas previously, we find it more convenient to explore this problem using an open incompressible geometry in which plasma is continually entering and exiting the reconnection region. Specially, we find the scaling of the Hall-MHD system size analytically, rather than numerically as in the X-point problem of Chapter 5. Chapter 7 summarizes the results of investigations in Chapters 4, 5 and 6.
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Critelli, Renato Anselmo Júdica. "Strongly coupled non-Abelian plasmas in a magnetic field." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-18072016-183858/.

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In this dissertation we use the gauge/gravity duality approach to study the dynamics of strongly coupled non-Abelian plasmas. Ultimately, we want to understand the properties of the quark-gluon plasma (QGP), whose scientifc interest by the scientific community escalated exponentially after its discovery in the 2000\'s through the collision of ultrarelativistic heavy ions. One can enrich the dynamics of the QGP by adding an external field, such as the baryon chemical potential (needed to study the QCD phase diagram), or a magnetic field. In this dissertation, we choose to investigate the magnetic effects. Indeed, there are compelling evidences that strong magnetic fields of the order $eB\\sim 10 m_\\pi^2$ are created in the early stages of ultrarelativistic heavy ion collisions. The chosen observable to scan possible effects of the magnetic field on the QGP was the viscosity, due to the famous result $\\eta/s=1/4\\pi$ obtained via holography. In a first approach we use a caricature of the QGP, the $\\mathcal=4$ super Yang-Mills plasma to calculate the deviations of the viscosity as we add a magnetic field. We must emphasize, though, that a magnetized plasma has a priori seven viscosity coefficients (five shears and two bulks). In addition, we also study in this same model the anisotropic heavy quark-antiquark potential in the presence of a magnetic field. In the end, we propose a phenomenological holographic QCD-like model, which is built upon the lattice QCD data, to study the thermodynamics and the viscosity of the QGP with an external strong magnetic field.
Nesta dissertação utilizamos uma abordagem via dualidade gauge/gravity para estudar a dinâmica de plasmas não-Abelianos fortemente interagentes. Nosso objetivo último visa aplicações para o plasma de quarks e glúons (QGP), cujo interesse científico cresceu exponencialmente depois de sua descoberta em meados dos anos 2000 ao colidir-se íons ultrarelativísticos. Podemos enriquecer a dinâmica do QGP ao adicionarmos campos externos, como o potencial químico (para exploração do diagrama de fases hadrônico), ou um campo magnético. Nesta dissertação, tomamos como norte a exploração dos efeitos magnéticos. De fato, acredita-se que campos magnéticos da ordem de $eB\\sim 10 m_\\pi^2$ sejam criados nos estágios iniciais do QGP. O observável escolhido para sondar possíveis efeitos do campo magnético no QGP foi a viscosidade, em partes pelo famoso resultado $\\eta/s=1/4\\pi$ obtido holograficamente. Utilizamos num primeiro momento uma caricatura da QCD, a $\\mathcal=4$ super Yang-Mills para calcular o que muda na viscosidade com o advento do campo magnético. Devemos salientar, contudo, que um plasma altamente magnetizado possui a priori sete coeficientes de viscosidade (cinco de cisalhamento e duas volumétricas). Também exploramos, nesse mesmo modelo, o potencial de um par pesado de quark-antiquark na presença de um campo magnético. Por fim, propomos um modelo holográfico fenomenológico mais semelhante a QCD, sendo ele ``calibrado\'\' pelos dados da QCD na rede, para estudar a termodinâmica e a viscosidade do QGP imerso num forte campo magnético.
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AHMAD, ALI. "Study of impulsive magnetic reconnection due to resistive tearing mode with the effect of viscosity and dynamic flow in fusion plasmas." Kyoto University, 2015. http://hdl.handle.net/2433/199415.

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Tawhid-Al-Islam, Kazi M. "Electromagnetic Effect on the Rheology of Liquid Suspension." Diss., Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/513297.

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Physics
Ph.D.
Innovative methods to control the viscosity and turbulence in the flow of liquid suspension can be engineered by way of incorporating the concepts of electric and magnetic field into the rheology of complex fluids. Rheology of liquid Chocolate is a very crucial factor in determining the cost of manufacturing process as well as formulating varieties of end consumer products, for example, containing less fat. We have invented a method to lower the viscosity of liquid chocolate flow with the application of electric field. In the lab, we have found that viscosity of chocolate samples is reduced by 40~50% with our method. Thus, fat content in those samples can be reduced by 10% or more. Therefore, we expect to see much healthier and tastier chocolate product in the market once this technology gets implemented in commercial manufacturing. High viscosity and turbulence in blood flow greatly increase the risk of cardiac diseases. Hence, discovering new method to address turbulence suppression and viscosity reduction is critically important. In our study, we have found that in the in-vitro experiment, if blood is subjected to flow through a channel placed inside a strong magnetic field, its viscosity reduces by 10~20%. Based on these findings, a Megneto-Rheology (MR) therapeutic device has been developed to examine the effect on the blood pressure in human subjects. Preliminary clinical trials show that application of this MR therapy reduces blood pressure by 10% or more. In this thesis, above mentioned inventions for the flow of Blood and liquid Chocolate will be thoroughly discussed.
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Tawhid-Al-Islam, Kazi M. "blood_flow with Mag_field." Diss., Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/526135.

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Physics
Ph.D.
Innovative methods to control the viscosity and turbulence in the flow of liquid suspension can be engineered by way of incorporating the concepts of electric and magnetic field into the rheology of complex fluids. Rheology of liquid Chocolate is a very crucial factor in determining the cost of manufacturing process as well as formulating varieties of end consumer products, for example, containing less fat. We have invented a method to lower the viscosity of liquid chocolate flow with the application of electric field. In the lab, we have found that viscosity of chocolate samples is reduced by 40~50% with our method. Thus, fat content in those samples can be reduced by 10% or more. Therefore, we expect to see much healthier and tastier chocolate product in the market once this technology gets implemented in commercial manufacturing. High viscosity and turbulence in blood flow greatly increase the risk of cardiac diseases. Hence, discovering new method to address turbulence suppression
Temple University--Theses
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Tawhid-Al-Islam, Kazi M. "blood_flow without Mag_field." Diss., Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/526136.

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Physics
Ph.D.
Innovative methods to control the viscosity and turbulence in the flow of liquid suspension can be engineered by way of incorporating the concepts of electric and magnetic field into the rheology of complex fluids. Rheology of liquid Chocolate is a very crucial factor in determining the cost of manufacturing process as well as formulating varieties of end consumer products, for example, containing less fat. We have invented a method to lower the viscosity of liquid chocolate flow with the application of electric field. In the lab, we have found that viscosity of chocolate samples is reduced by 40~50% with our method. Thus, fat content in those samples can be reduced by 10% or more. Therefore, we expect to see much healthier and tastier chocolate product in the market once this technology gets implemented in commercial manufacturing. High viscosity and turbulence in blood flow greatly increase the risk of cardiac diseases. Hence, discovering new method to address turbulence suppression
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Books on the topic "Magnets – Viscosity"

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Horing, Norman J. Morgenstern. Superfluidity and Superconductivity. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.003.0013.

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Chapter 13 addresses Bose condensation in superfluids (and superconductors), which involves the field operator ψ‎ having a c-number component (<ψ(x,t)>≠0), challenging number conservation. The nonlinear Gross-Pitaevskii equation is derived for this condensate wave function<ψ>=ψ−ψ˜, facilitating identification of the coherence length and the core region of vortex motion. The noncondensate Green’s function G˜1(1,1′)=−i<(ψ˜(1)ψ˜+(1′))+> and the nonvanishing anomalous correlation function F˜∗(2,1′)=−i<(ψ˜+(2)ψ˜+(1′))+> describe the dynamics and elementary excitations of the non-condensate states and are discussed in conjunction with Landau’s criterion for viscosity. Associated concepts of off-diagonal long-range order and the interpretation of <ψ> as a superfluid order parameter are also introduced. Anderson’s Bose-condensed state, as a phase-coherent wave packet superposition of number states, resolves issues of number conservation. Superconductivity involves bound Cooper pairs of electrons capable of Bose condensation and superfluid behavior. Correspondingly, the two-particle Green’s function has a term involving a product of anomalous bound-Cooper-pair condensate wave functions of the type F(1,2)=−i<(ψ(1)ψ(2))+>≠0, such that G2(1,2;1′,2′)=F(1,2)F+(1′,2′)+G˜2(1,2;1′,2′). Here, G˜2 describes the dynamics/excitations of the non-superfluid-condensate states, while nonvanishing F,F+ represent a phase-coherent wave packet superposition of Cooper-pair number states and off-diagonal long range order. Employing this form of G2 in the G1-equation couples the condensed state with the non-condensate excitations. Taken jointly with the dynamical equation for F(1,2), this leads to the Gorkov equations, encompassing the Bardeen–Cooper–Schrieffer (BCS) energy gap, critical temperature, and Bogoliubov-de Gennes eigenfunction Bogoliubons. Superconductor thermodynamics and critical magnetic field are discussed. For a weak magnetic field, the Gorkov-equations lead to Ginzburg–Landau theory and a nonlinear Schrödinger-like equation for the pair wave function and the associated supercurrent, along with identification of the Cooper pair density. Furthermore, Chapter 13 addresses the apparent lack of gauge invariance of London theory with an elegant variational analysis involving re-gauging the potentials, yielding a manifestly gauge invariant generalization of the London equation. Consistency with the equation of continuity implies the existence of Anderson’s acoustic normal mode, which is supplanted by the plasmon for Coulomb interaction. Type II superconductors and the penetration (and interaction) of quantized magnetic flux lines are also discussed. Finally, Chapter 13 addresses Josephson tunneling between superconductors.
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Book chapters on the topic "Magnets – Viscosity"

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Becher, M., M. Seeger, J. Bauer, and H. Kronmüller. "Magnetic Viscosity Measurements on FeNdB - Magnets with Different Microstructure." In Magnetic Hysteresis in Novel Magnetic Materials, 657–61. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5478-9_71.

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Tejada, J., X. X. Zhang, and J. M. Hernandez. "Magnetic Viscosity and Hysteresis Phenomena." In Magnetic Hysteresis in Novel Magnetic Materials, 221–32. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5478-9_22.

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Tout, C. A., and J. E. Pringle. "Disc Viscosity from a Magnetic Dynamo." In Cataclysmic Variables, 425. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0335-0_118.

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Kundt, W. "Magnetic Viscosity as the Dominant Shear Force in Accretion Disks." In Galactic and Intergalactic Magnetic Fields, 139–42. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0569-6_42.

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Castro, David J., Jin-Oh Song, Robert K. Lade, and Lorraine F. Francis. "Magnetic Microrheology for Characterization of Viscosity in Coatings." In Protective Coatings, 115–36. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51627-1_5.

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Sailaja, A. S., B. Jagadeesh, K. Venu, and V. S. S. Sastry. "Rotational Viscosity in a Re-entrant Liquid Crystal Mixture — a NMR Study." In 25th Congress Ampere on Magnetic Resonance and Related Phenomena, 337–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-76072-3_174.

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Kuznetsov, V. D. "Magnetic Buoyancy with Viscosity and Ohmic Dissipation and Flux Tube Formation." In Basic Plasma Processes on the Sun, 58–59. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0667-9_11.

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Nakao, Yasushi. "Enhancement of Turbulent Viscosity by Global Magnetic Fields in Accretion Disks." In The Hot Universe, 412. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4970-9_148.

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Kulkarni, A. D., and K. S. Wani. "Investigations on Recovery of Apparent Viscosity of Crude Oil After Magnetic Fluid Conditioning." In Proceedings of the 7th International Conference on Advances in Energy Research, 295–304. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5955-6_29.

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Abdibekova, Aigerim, Bakhytzhan Zhumagulov, and Dauren Zhakebayev. "Modelling of Evolution Small-Scale Magnetohydrodynamic Turbulence Depending on the Magnetic Viscosity of the Environment." In Communications in Computer and Information Science, 13–25. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25058-8_2.

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Conference papers on the topic "Magnets – Viscosity"

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Cornejo, D. R., V. Villas-Boas, and F. P. Missell. "Reversible Processes And Magnetic Viscosity Of Nanocrystalline Permanent Magnets." In 7th Joint MMM-Intermag Conference. Abstracts. IEEE, 1998. http://dx.doi.org/10.1109/intmag.1998.737280.

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Oshikawa, Yuki, Takashi Innami, and Tatsuo Sawada. "Velocity Profile Measurement of an Oscillating Pipe Flow of a Magnetic Fluid." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45038.

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Since UVP is the method to take the velocity information by using ultrasound, this method is very suitable for measuring the velocity profile of opaque fluid. Oscillating pipe flow of a magnetic fluid was investigated experimentally to examine the applicability of this method to magnetic fluid flow. We used a diluted water-base magnetic fluid and the magnetic field was applied by two permanent magnets. Influence of an applied magnetic field on flow behaviors were discussed. The amplitude and phase of the oscillating velocity varied with intensity of the magnetic field, which yielded increase of the apparent viscosity.
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Fang, Yikun, Zhiyu Jiang, Rui Han, Tao Liu, Minggang Zhu, and Wei Li. "Spin Reorientation, Magnetic Viscosity and Exchange Coupling Effects of the Nd-Ce-Fe-B Sintered Magnets Prepared by Singlemain-Phase and Dual-Main-Phase Alloy Methods." In 2018 IEEE International Magnetic Conference (INTERMAG). IEEE, 2018. http://dx.doi.org/10.1109/intmag.2018.8508040.

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Cuadra, Rafael, and Akira Satoh. "Experiment on Negative Magneto-Rheological Characteristics to Verify the Theoretical Prediction Based on the Orientational Distribution Function." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65353.

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In a suspension composed of spindle-like hematite particles (α-Fe2O3), the previous theoretical study based on the orientational distribution function has shown that the viscosity due to the magnetic properties of spindle-like hematite particles exhibits negative magneto-rheological characteristics in a certain situation of the orientational distribution of the particles under a certain applied magnetic field circumstance. This is mainly because the spindle-like hematite particles have a unique characteristic in that they are magnetized in a direction normal to the particle axis direction. This weak magnetic characteristic yields an advantage to the suspension in that it is relatively straightforward to synthesize a stable dispersion of such hematite particles because the electric double layer functions well for preventing the particles from aggregating. The negative magneto-rheological effect has also energetically been investigated by a simulation approach based on the Brownian dynamics and these simulation results clearly show that the negative magneto-rheological characteristics certainly arise in a multi-particle suspension system. From this background, in the previous experimental study, we synthesized a suspension composed of spindle-like hematite particles and measured the viscosity due to the magnetic properties of the particles in a simple shear flow. This first simple experiment has succeeded in verifying that the negative magneto-rheological characteristics surely arise in an actual hematite particle suspension. The present study further advances the experimental investigation of the negative magneto-rheological effect in order to obtain the more detailed data of these negative magneto-rheological characteristics. The viscosity due to the magnetic properties was measured using a cone-plate-type rheometer, located in the uniform area of the magnetic field, under various conditions of the magnetic field strength and the shear rate of a shear flow. The viscosity of hematite-glycerol-water dispersions becomes negative, attains to a minimum value, after that starts to increase, and finally becomes positive with increasing magnetic field strength. These characteristics of the negative viscosity are in good agreement with the theoretical prediction that was obtained by the orientational distribution function.
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Stoyanov, P. G., C. A. Grimes, and K. G. Ong. "A magnetoelastic viscosity sensor." In IEEE International Magnetics Conference. IEEE, 1999. http://dx.doi.org/10.1109/intmag.1999.837581.

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Lawson, P., and R. Gerber. "Viscosity effects in multi-wire HGMS." In International Conference on Magnetics. IEEE, 1990. http://dx.doi.org/10.1109/intmag.1990.734449.

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Satoh, Akira. "Phase Change and Magneto-Rheology of a Suspension Composed of Magnetic Rod-Like Particles." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51263.

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Magnetic particle suspensions have a great potential as an application in engineering fields and therefore a variety of studies on these functional fluid have been conducted in various fields, including the traditional fluid engineering field and the recent bioengineering field such as an application to a drug delivery system. The main application target in the fluid engineering field may be mechanical dampers and actuators. Magneto-rheological properties significantly depend on the formation of aggregates of magnetic particles. In the present study, we focus on a ferromagnetic rod-like particle suspension to discuss the phase change of aggregate structures of magnetic rod-like particles and the magneto-rheological properties that are strongly dependent on the formation of aggregate structures. The characteristics of the phase change are mainly investigated by Monte Carlo simulations for thermodynamic equilibrium and the magneto-rheological properties are done by Brownian dynamics simulations in a simple shear flow situation. From the latter simulations, we discuss mainly the dependence of the magneto-rheological effect on the phase change of aggregate structures. In a weak applied magnetic field, magnetic rod-like particles tend to aggregate to form raft-like clusters if the magnetic particle-particle interaction is much stronger than thermal energy. If the magnetic field strength is increased, these raft-like clusters drastically dissociate into single-moving particles at a certain value of the magnetic field strength, that is, the phase change in aggregate structures arises. The net viscosity and viscosity components exhibit complex dependence on the magnetic field strength, which is mainly due to the raft-like cluster formation of magnetic particles.
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Ferguson, G. B., K. O'Grady, J. Poppelwell, and R. W. Cantrell. "magnetisation mechanics and magnetic viscosity in NDFEB alloys." In International Magnetics Conference. IEEE, 1989. http://dx.doi.org/10.1109/intmag.1989.690012.

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Mizoguchi, T., and H. Kronmuller. "Demagnetization processes and magnetic viscosity of amorphous FeTb films." In International Magnetics Conference. IEEE, 1989. http://dx.doi.org/10.1109/intmag.1989.689969.

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Richter, H. J., and K. A. Hempel. "Magnetic viscosity measurements on an isolated single domain particle." In International Magnetics Conference. IEEE, 1989. http://dx.doi.org/10.1109/intmag.1989.690011.

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Reports on the topic "Magnets – Viscosity"

1

Joseph, Ilon. Viscosity and Vorticity in Reduced Magneto-Hydrodynamics. Office of Scientific and Technical Information (OSTI), August 2015. http://dx.doi.org/10.2172/1240946.

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Matsumoto, R., and T. Tajima. Magnetic viscosity by localized shear flow instability in magnetized accretion disks. Office of Scientific and Technical Information (OSTI), January 1995. http://dx.doi.org/10.2172/10120439.

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Kimin Kim, et al. Calculation of Neoclassical Toroidal Viscosity with a Particle Simulation in the Tokamak Magnetic Breaking Experiments. Office of Scientific and Technical Information (OSTI), April 2013. http://dx.doi.org/10.2172/1089859.

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Zalesak, S. T., J. D. Huba, and P. Satyanarayana. Slab Model Analysis of Magnetic and Collisional Viscosity Effects on the First Generation of Nuclear Structure. Fort Belvoir, VA: Defense Technical Information Center, April 1989. http://dx.doi.org/10.21236/ada207880.

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