Results 71 to 80 of about 493,635 (196)

Atomic Model of Susy Hubbard Operators

, 2002
We apply the recently proposed susy Hubbard operators to an atomic model. In the limiting case of free spins, we derive exact results for the entropy which are compared with a mean field + gaussian corrections description.
A. Auerbach, A. Auerbach, A. Schroeder, A.A. Abrikosov, A.J. Millis, A.J. Millis, C. Jayaprakash, C. Panagopoulos, C. Pépin, C. Pépin, C.L. Kane, C.M. Varma, D. Yoshioka, D. Yoshioka, D.P. Arovas, D.P. Arovas, J. Custers, J. Gan, J. Gan, J. Gan, J. Hopkinson, J.L. Tallon, N. Read, N. Read, O. Parcollet, O. Trovarelli, P. Coleman, P. Coleman, P. Coleman, P. Coleman, P. Coleman, P. Coleman, P. Coleman, S.E. Barnes, S.E. Barnes, T.K. Ng   +35 more
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The Long-Term Effects of Africa's Slave Trades [PDF]

Can part of Africa's current underdevelopment be explained by its slave trades? To explore this question, I use data from shipping records and historical documents reporting slave ethnicities to construct estimates of the number of slaves exported from ...
Nathan Nunn
core  

Slave boson model for two-dimensional trapped Bose-Einstein condensate

, 2005
A system of N bosons in a two-dimensional harmonic trap is considered. The system is treated in term of the slave boson representation for hard-core bosons which is valid in the arbitrary density regimes.
Barnes S E, Frésard R, Gross E P, K K Rajagopal, Kosterlitz J M, Negele J W, Nunes G S, Pilati S Boronat J Casulleras J Giorgini S, Pitaevskii L P, Popov V N, Sachdev S, Tanatar B, Ziegler K   +12 more
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Drivers of demographic decline across the annual cycle of a threatened migratory bird

Scientific Reports, 2018
Migratory species are rapidly declining but we rarely know which periods of the annual cycle are limiting for most species. This knowledge is needed to effectively allocate conservation resources to the periods of the annual cycle that best promote ...
Scott Wilson, James F. Saracco, Richard Krikun, D. T. Tyler Flockhart, Christine M. Godwin, Kenneth R. Foster   +5 more
doaj   +1 more source

Fem Analysis of Proppant Sticking in Rock Cracks

Archives of Civil Engineering, 2018
The problem of effective gas extraction from Polish shale rocks is an interesting research subject for scientists. A properly selected proppant, which protects cracks from closing during the fracturing process, inestimably contributes to an increase of ...
Kwietniewski M., Miedzińska D., Niezgoda T.   +2 more
doaj   +1 more source

Isaac Mason, une vie d’esclave. Traduction, introduction et notes de Claire Bourhis-Mariotti. Mont-Saint-Aignan : Presses de Rouen et du Havre, 2021, 212 p.

Caliban: French Journal of English Studies, 2022
Marie-Pierre Baduel
doaj   +1 more source

Fractionalization and confinement in the U(1) and $Z_2$ gauge theories of strongly correlated systems

, 2000
Recently, we have elucidated the physics of electron fractionalization in strongly interacting electron systems using a $Z_2$ gauge theory formulation. Here we discuss the connection with the earlier U(1) gauge theory approaches based on the slave boson ...
Anderson P W, Balents L, Balents L, Matthew P A Fisher, Nayak C, Read N, Read N, Senthil T, Senthil T, T Senthil   +9 more
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Helicity Modulus and Effective Hopping in the Two-Dimensional Hubbard Model Using Slave-Boson Methods

, 1994
The slave-boson mean-field method is used to study the two-dimensional Hubbard model. A magnetic phase diagram allowing for paramagnetism, weak- and strong ferromagnetism and antiferromagnetism, including all continuous and first-order transitions, is ...
Abramowitz M, Dagotto E, Denteneer P J H, Evans S M M, Fradkin E, Frésard R, Frésard R, Frésard R, Hubbard J, Kanamori J, Long M W, M Blaauboer, Möller B, P J H Denteneer, ten Haaf D F B, Vollhardt D, von der Linden W, Wolfram S   +17 more
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Master/slave manipulator system [PDF]

, 1973
System capabilities are equivalent to mobility, dexterity, and strength of human arm. Arrangement of torque motor, harmonic drive, and potentiometer combination allows all power and control leads to pass through center of slave with position-transducer ...
King, R. F., Vallotton, W. C., Vykukal, H. C.   +2 more
core   +1 more source

Synchronization of Active Atomic Clocks via Quantum and Classical Channels

, 2016
Superradiant lasers based on atomic ensembles exhibiting ultra-narrow optical transitions can emit light of unprecedented spectral purity and may serve as active atomic clocks.
Hammerer, Klemens, Roth, Alexander
core   +1 more source