scholarly journals Controlling dipolar exchange interactions in a dense three-dimensional array of large-spin fermions

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
A. Patscheider ◽  
B. Zhu ◽  
L. Chomaz ◽  
D. Petter ◽  
S. Baier ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Exchange Interactions ◽  
Dimensional Array ◽  
Large Spin

Local Heat Transfer Characteristics in Simulated Electronic Modules

2003 ◽  
Vol 125 (3) ◽  
pp. 362-368 ◽  
Author(s):  
Seong-Yeon Yoo ◽  
Jong-Hark Park ◽  
Min-Ho Chung
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Three Dimensional ◽  
Vortex Generator ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Two Dimensional ◽  
Heat Transfer Characteristics ◽  
Dimensional Array ◽  
Transfer Characteristics

When heat is released by forced convection from electronic modules in a narrow printed circuit board channel, complex flow phenomena—such as stagnation and acceleration on the front surface, separation and reattachment on the top surface, wake or cavity flow near the rear surface—affect the heat transfer characteristics. The purpose of this study is to investigate how these flow conditions influence the local heat transfer from electronic modules. Experiments are performed on a three-dimensional array of hexahedral elements as well as on a two-dimensional array of rectangular elements. Naphthalene sublimation technique is employed to measure three-dimensional local mass transfer, and the mass transfer data are converted to their counterparts of the heat transfer process using the analogy equation between heat and mass transfer. Module location and streamwise module spacing are varied, and the effect of vortex generators on heat transfer enhancement is also examined. Dramatic change of local heat transfer coefficients is found on each surface of the module, and three-dimensional modules have a little higher heat transfer value than two-dimensional modules because of bypass flow. Longitudinal vortices formed by vortex generator enhance the mixing of fluids and thereby heat transfer, and the rectangular wing type vortex generator is found to be more effective than the delta wing type vortex generator.

Excited State Magnetic Exchange Interactions Enable Large Spin Polarization Effects

2018 ◽  
Vol 140 (6) ◽  
pp. 2221-2228 ◽  
Author(s):  
Benjamin W. Stein ◽  
Christopher R. Tichnell ◽  
Ju Chen ◽  
David A. Shultz ◽  
Martin L. Kirk
Keyword(s):  
Excited State ◽  
Spin Polarization ◽  
Exchange Interactions ◽  
Magnetic Exchange ◽  
Polarization Effects ◽  
Spin Polarization Effects ◽  
Large Spin

Chiral modular bootstrap

2019 ◽  
Vol 34 (28) ◽  
pp. 1950168 ◽  
Author(s):  
M. Ashrafi
Keyword(s):  
Black Hole ◽  
Upper Bound ◽  
Three Dimensional ◽  
Conformal Weight ◽  
Two Dimensional ◽  
Btz Black Hole ◽  
Conformal Field ◽  
Dimensional Gravity ◽  
Large Spin ◽  
Dimension Ratio

Using modular bootstrap we show the lightest primary fields of a unitary compact two-dimensional conformal field theory (with [Formula: see text], [Formula: see text]) has a conformal weight [Formula: see text]. This implies that the upper bound on the dimension of the lightest primary fields depends on their spin. In particular if the set of lightest primary fields includes extremal or near extremal states whose spin to dimension ratio [Formula: see text], the corresponding dimension is [Formula: see text]. From AdS/CFT correspondence, we obtain an upper bound on the spectrum of black hole in three-dimensional gravity. Our results show that if the first primary fields have large spin, the corresponding three-dimensional gravity has extremal or near extremal BTZ black hole.

A novel representative in the rare family of trivanadates, KMn2V3O10: synthesis, crystal structure and magnetic properties

2018 ◽  
Vol 74 (1) ◽  
pp. 97-103 ◽  
Author(s):  
Olga Yakubovich ◽  
Larisa Shvanskaya ◽  
Zlata Pchelkina ◽  
Olga Dimitrova ◽  
Anatoliy Volkov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Three Dimensional ◽  
Exchange Interactions ◽  
Potassium Ions ◽  
The Novel ◽  
First Principles Calculations ◽  
X Ray Diffraction ◽  
Magnetic Exchange ◽  
Cell Parameters ◽  
Magnetic Couplings

Potassium dimanganese trivanadate, KMn2V3O10, was synthesized hydrothermally and its crystal structure was determined from single-crystal X-ray diffraction data. The novel phase crystallizes with triclinic symmetry in space group P\bar 1 with unit-cell parameters of a = 6.912 (5), b = 6.993 (5), c = 9.656 (5) Å, α = 101.858 (5), β = 102.627 (5), γ = 100.669 (5)°, Z = 2 and V = 432.6 (5) Å3. Its structure is built from tetramers of MnO6 octahedra sharing edges and trimers of VO4 tetrahedra sharing vertices. These main structural fragments are linked in a three-dimensional framework with channels occupied by potassium ions. The transformation of this structure to that of interconnected NaCa3Mn(V3O10)(V2O7) is discussed. The title compound orders antiferromagnetically at T N = 8.2 K due to the magnetic exchange interactions between tetramers of Mn octahedra through VO4 tetrahedra. First-principles calculations show the magnetic couplings via Mn—O—Mn and Mn—O—V—O—Mn pathways.

scholarly journals A Three‐Dimensional Array for the Study of Infrasound Propagation Through the Atmospheric Boundary Layer

2019 ◽  
Vol 124 (16) ◽  
pp. 9299-9313 ◽  
Author(s):  
Madelon M. E. Smink ◽  
Jelle D. Assink ◽  
Fred C. Bosveld ◽  
Pieter S. M. Smets ◽  
Läslo G. Evers
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Three Dimensional ◽  
Dimensional Array
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