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A new apparatus has been developed to measure the conductivity of rock samples. The probe, which consists of multi-coil transmitters and receivers doesn't require physical contact with the samples. The measurement is based on the induction…

We reach a thermodynamic interpretation of CODET model and its prediction to electrons density and temperature grounded on the physics of hydro magnetism in global equilibrium. The thermodynamic interpretation finds consistency with the…

太阳与恒星天体物理 · 物理学 2020-05-19 Daniel B. Berdichevsky , Jenny M. Rodríguez Gómez , Luis E. Vieira , Allison Dal Lago

Meteorites, and in particular primitive meteorites (chondrites), are irreplaceable probes of the solar protoplanetary disk. We review their essential properties and endeavour to place them in astrophysical context. The earliest solar system…

地球与行星天体物理 · 物理学 2024-09-12 Emmanuel Jacquet , Cornelis Dullemond , Joanna Drążkowska , Steven Desch

A theory has been developed to explain the anomalous behavior of the magnetic susceptibility of a normal metal-superconductor ($NS$) structure in weak magnetic fields at millikelvin temperatures. The effect was discovered experimentally by…

超导电性 · 物理学 2015-06-25 G. A. Gogadze

The electronic thermal conductivity of iron at Earth's core conditions is an extremely important physical property in geophysics field. However, the exact value of electronic thermal conductivity of iron under extreme pressure and…

材料科学 · 物理学 2019-01-28 Sheng-Ying Yue , Ming Hu

Electrophoresis has been shown as a novel methodology to enhance heat conduction capabilities of nanocolloidal dispersions. A thoroughly designed experimental system has been envisaged to solely probe heat conduction across nanofluids by…

应用物理 · 物理学 2018-07-10 Purbarun Dhar , Lakshmi Sirisha Maganti , A R Harikrishnan , Chandan Rajput

Ferromagnetic magnetohydrodynamics concerns the study of conducting fluids with intrinsic magnetisation under the influence of a magnetic field. It is a generalisation of the magnetohydrodynamical equations and takes into account the…

偏微分方程分析 · 数学 2024-12-09 Noah Vinod , Thanh Tran

Chondritic meteorites constitute the most ancient rock record available in the laboratory to study the formation of the solar system and its planets. Detailed investigations of their mineralogy, petrography, chemistry and isotopic…

天体物理学 · 物理学 2008-09-11 Jerome Aleon

Magnetic field induced drastically augmented thermal conductivity of magneto nanocolloids involving magnetic oxide nanoparticles, viz. Fe2O3, Fe3O4, Nickel oxide (NiO), Cobalt oxide (Co3O4), dispersed in different base fluids (heat transfer…

介观与纳米尺度物理 · 物理学 2016-08-03 Ajay Katiyar , Purbarun Dhar , Tandra Nandi , Sarit K. Das

We study magnetic field steepening due to ambipolar diffusion (Brandenburg & Zweibel 1994) in protoplanetary disk environments and draw the following conclusions. Current sheets are generated in magnetically active regions of the disk where…

天体物理学 · 物理学 2009-11-10 M. K. Ryan Joung , Mordecai-Mark Mac Low , Denton S. Ebel

The persistent thermal luminosity of magnetars and their outbursts suggest the existence of some internal heat sources located in their outer crust. The compression of matter accompanying the decay of the magnetic field may trigger…

高能天体物理现象 · 物理学 2021-06-10 Nicolas Chamel , Anthea Francesca Fantina , Lami Suleiman , Julian-Leszek Zdunik , Pawel Haensel

Chondrite meteorites are believed to represent the building blocks of the solar nebula, out of which our solar system formed. They are a mixture of silicate and oxide objects (chondrules and refractory inclusions) that experienced extremely…

地球与行星天体物理 · 物理学 2012-01-19 Raquel Salmeron , Trevor Ireland

Sub-Neptunes and Neptunes are often modeled with distinct, fully convective layers. Yet, there are several arguments for compositions gradients that can inhibit convection. In these regions, energy transport depends on the thermal…

地球与行星天体物理 · 物理学 2026-05-29 Mark Eberlein , Ravit Helled

The vast amount of computational studies on electrical conduction in solid-state electrolytes is not mirrored by comparable efforts addressing thermal conduction, which has been scarcely investigated despite its relevance to thermal…

材料科学 · 物理学 2024-06-18 Davide Tisi , Federico Grasselli , Lorenzo Gigli , Michele Ceriotti

Outflows driven by large-scale magnetic fields likely play an important role in the evolution and dispersal of protoplanetary disks, and in setting the conditions for planet formation. We extend our 2-D axisymmetric non-ideal MHD model of…

地球与行星天体物理 · 物理学 2020-07-01 Oliver Gressel , Jon P. Ramsey , Christian Brinch , Richard P. Nelson , Neal J. Turner , Simon Bruderer

We consider the impact of electromagnetic induction and Ohmic heating on a conducting planetary object that orbits a magnetic star. Power dissipated as heat saps orbital energy. If this heat is trapped by an insulating crust or mantle,…

地球与行星天体物理 · 物理学 2019-05-08 Benjamin C. Bromley , Scott J. Kenyon

We present a theory of carrier-induced ferromagnetism in diluted magnetic semiconductors (III_{1-x} Mn_x V) which allows for arbitrary itinerant-carrier spin polarization and dynamic correlations. Both ingredients are essential in…

凝聚态物理 · 物理学 2009-10-31 Jürgen König , Hsiu-Hau Lin , Allan H. MacDonald

The mechanism of rapid and selective heating of magnetic metal oxides under the magnetic field of microwaves which continues beyond the Curie temperature $ T_{c} $ is identified by using the Heisenberg model. Monte Carlo calculations based…

材料科学 · 物理学 2009-02-13 Motohiko Tanaka , Hirohiko Kono , Koji Maruyama

The magnetic field plays a crucial role in heating the solar corona, but the exact energy release mechanism(s) is(are) still unknown. Here, we investigate in detail, the process of magnetic energy release in a situation where two initially…

天体物理学 · 物理学 2009-11-10 K. Galsgaard , C. E. Parnell

Effective theory framework based on symmetry has recently gained widespread interest in the field of cosmology. In this paper, we apply the same idea on the genesis of the primordial magnetic field and its evolution throughout the…

高能物理 - 理论 · 物理学 2021-05-26 Debaprasad Maity , Sourav Pal , Tanmoy Paul