Results 31 to 40 of about 9,859 (203)

Exact spin dynamics of the 1/r^2 supersymmetric t-J model in a magnetic field

, 2006
The dynamical spin structure factor S^{zz}(Q,omega) in the small momentum region is derived analytically for the one-dimensional supersymmetric t-J model with 1/r^2 interaction. Strong spin-charge separation is found in the spin dynamics.
Arikawa M, Baker T H, Efetov K, Hanlon P J, Kato Y, Kuramoto Y, Macdonald I G, Macdonald I G, Mehta M L, Mitsuhiro Arikawa, Peysson S, Takemura K, Yasuhiro Saiga   +12 more
core   +1 more source

Quantum criticality and first-order transitions in the extended periodic Anderson model [PDF]

, 2013
We investigate the behavior of the periodic Anderson model in the presence of $d$-$f$ Coulomb interaction ($U_{df}$) using mean-field theory, variational calculation, and exact diagonalization of finite chains.
Hagymasi, I., Itai, K., Solyom, J.
core   +2 more sources

Within-group spatial position in Saiga tatarica (Bovidae) in the Stepnoi State Nature Sanctuary, Astrakhan Region, Russia

Nature Conservation Research: Заповедная наука, 2023
In group-living animals, the social structure and organisation play a significant role in survival and reproduction. Understanding the social aspects of animal lives in the wild may be crucially important for effective conservation of threatened species.
Karina A. Karenina, Ekaterina A. Berezina, Andrey N. Giljov   +2 more
doaj   +1 more source

Dynamical Structure Factors of the Spin-1/2 XXZ Chain with Inverse-Square Exchange and Ising Anisotropy

, 1998
The dynamical properties of the S=1/2 antiferromagnetic XXZ chain are studied by the exact diagonalization and the recursion method of finite systems up to 24 sites.
Achiwa N., Arai M., Bethe H. A., Bougourzi A. H., Bougourzi A. H., des Cloizeaux J., Fabricius K., Gagliano E. R., Gebhard F., Gutzwiller M. C., Haas S., Haldane F. D. M., Haldane F. D. M., Hase M., Hatsugai Y., Hirakawa K., Hubbard J., Hulthén L., Igarashi J., Ishimura N., Karbach M., Mohan M., Müller G., Nishi M., Saiga Y., Shastry B. S., Shastry B. S., Takahashi M., Talstra J. C., Walker L. R., Yoshizawa H., Zhong Q. F.   +31 more
core   +1 more source

Rapidly assessing the risks of infectious diseases to wildlife species [PDF]

Royal Society Open Science, 2019
Predicting the likelihood of rare events is increasingly demanded by risk managers. A key challenge is dealing with different types of uncertainty, including epistemic uncertainties (lack of knowledge), stochasticity (inherent randomness) and natural ...
Wendy Beauvais, Steffen Zuther, Chantal Villeneuve, Richard Kock, Javier Guitian   +4 more
doaj   +1 more source

Electron Addition Spectrum in the Supersymmetric t-J Model with Inverse-Square Interaction

, 2001
The electron addition spectrum A^+(k,omega) is obtained analytically for the one-dimensional (1D) supersymmetric t-J model with 1/r^2 interaction. The result is obtained first for a small-sized system and its validity is checked against the numerical ...
B. Sutherland, B. Sutherland, B. Sutherland, B. Sutherland, C. F. Dunkl, C. Kim, D. F. Wang, F. D. M. Haldane, F. Lesage, H. Fujisawa, I. G. Macdonald, K. Penc, K. Penc, K. Takemura, M. Arikawa, Mitsuhiro Arikawa, T. H. Baker, T. Tohyama, Y. Kato, Y. Kato, Y. Kato, Y. Kato, Y. Kato, Y. Kuramoto, Y. Kuramoto, Y. Saiga, Yasuhiro Saiga, Yoshio Kuramoto, Z. N. C. Ha, Z. N. C. Ha, Z. N. C. Ha, Z. N. C. Ha   +31 more
core   +1 more source

Humans are not unique: difficult birth is common in placental mammals

Biological Reviews, EarlyView.
ABSTRACT Human childbirth is widely presumed to be uniquely difficult and dangerous compared to birth in other mammals. Tight fetopelvic proportions can result in obstructed labour and contribute to high rates of maternal and neonatal mortality. Ideas summarised under the ‘obstetrical dilemma’ have contributed to this assumption by explaining difficult
Nicole D. S. Grunstra
wiley   +1 more source

A study into the current state of Saiga tatarica L. populations with the use of retrospective data

Acta Scientiarum: Animal Sciences
The saiga antelope (Saiga tatarica tatarica L., 1766, S) is a prominent ungulate mammal species inhabiting Central Asia. Over the latter half of the 20th century, saiga populations, including the Volga-Ural (Kazakhstan) population, experienced a ...
Talgat Begilov, Yuriy Grachev , Birlikbay Eszhanov   +2 more
doaj   +1 more source

Competition between spin exchange and correlated hopping

, 2001
The ground-state phase diagram is numerically studied for an electronic model consisting of the spin exchange term (J) and the correlated hopping term (t_3: the three-site term). This model has no single-particle hopping and the ratio of the two terms is
Affleck, Ammon, Bardeen, Batista, Bednorz, Bulut, Dagotto, Dagotto, Dessau, Emery, Harris, Hirsch, Imada, Kohno, M Imada, Nakamura, Ogata, Okamoto, Tsunetsugu, Y Saiga, Yokoyama   +20 more
core   +1 more source

Genetic mapping of natural variation in potassium concentrations in shoots of Arabidopsis thaliana [PDF]

, 2006
Naturally-occurring variation in K+ concentrations between plant genotypes is potentially exploitable in a number of ways, including altering the relationship between K+ accumulation and growth, enhancing salinity resistance, or improving forage quality.
Harada, H., Leigh, R.
core   +1 more source