1,084 research outputs found
Comparison of NIRS based methods to determine legume content of mixed swards
Four established and two new NIRS calibrations for the determination of legume content in dry ground mixtures were used to estimate clover content in ten Finnish red clover-grass mixtures of known legume content
Structure of f0(980) from a Coupled Channel Analysis of S-wave pi pi Scattering
A coupled channel model is used to study the nature of the f0(980) resonance.
It is shown that the existence of two poles close to KKbar threshold, as found
in many data fits and confirmed here, can be reconciled with the KKbar
molecular origin of the f0(980). Due to a strong coupling between channels the
number of the S-matrix poles close to the physical region in the physical case
exceeds the number of bare states introduced in the model.Comment: 18 pages, 14 figures, published in Eur. Phys. J. C (online: February
20, 1998). The problem is more fully explored in the updated version: the
model includes the direct coupling of qqbar channel to both pipi and KKbar
channels, three new figures are added, and two data fits showing different
possibilities of the interaction between the KKbar and qqbar states are
presented and discusse
A Dispersive Analysis on the and Resonances in Processes
We estimate the di-photon coupling of , and
resonances in a coupled channel dispersive approach. The di-photon
coupling is also reinvestigated using a single channel matrix for
scattering with better analyticity property, and it is found to be
significantly smaller than that of a state. Especially we also
estimate the di-photon coupling of the third sheet pole located near
threshold, denoted as .
It is argued that this third sheet pole may be originated from a coupled
channel Breit-Wigner description of the resonance.Comment: 24 pages and 13 eps figures. A nuerical bug in previous version is
fixed. Some results changed. References and new figures added. Version to
appear in Phys. Rev.
Contributors to the January Issue/Notes
Notes by John J. Locher, W. A. Stewart, John H. Logan, John A. Berry, Albert J. Andreoni, Richard A. Molique, Robert B. Devine, and Joseph A. McCabe
Contributors to the January Issue/Notes
Notes by John J. Locher, W. A. Stewart, John H. Logan, John A. Berry, Albert J. Andreoni, Richard A. Molique, Robert B. Devine, and Joseph A. McCabe
An Inward-Facing Conformation of a Putative Metal-Chelate–Type ABC Transporter
The crystal structure of a putative metal-chelate–type adenosine triphosphate (ATP)–binding cassette (ABC) transporter encoded by genes HI1470 and HI1471 of Haemophilus influenzae has been solved at 2.4 angstrom resolution. The permeation pathway exhibits an inward-facing conformation, in contrast to the outward-facing state previously observed for the homologous vitamin B12 importer BtuCD. Although the structures of both HI1470/1 and BtuCD have been solved in nucleotide-free states, the pairs of ABC subunits in these two structures differ by a translational shift in the plane of the membrane that coincides with a repositioning of the membrane-spanning subunits. The differences observed between these ABC transporters involve relatively modest rearrangements and may serve as structural models for inward- and outward-facing conformations relevant to the alternating access mechanism of substrate translocation
Spin wave analysis to the spatially-anisotropic Heisenberg antiferromagnet on triangular lattice
We study the phase diagram at T=0 of the antiferromagnetic Heisenberg model
on the triangular lattice with spatially-anisotropic interactions. For values
of the anisotropy very close to J_alpha/J_beta=0.50, conventional spin wave
theory predicts that quantum fluctuations melt the classical structures, for
S=1/2. For the regime J_beta<J_alpha, it is shown that the incommensurate
spiral phases survive until J_beta/J_alpha=0.27, leaving a wide region where
the ground state is disordered. The existence of such nonmagnetic states
suggests the possibility of spin liquid behavior for intermediate values of the
anisotropy.Comment: Revised version, 4 pages, Latex (twocolumn), 4 figures as eps files.
To appear in PR
Systematic Theoretical Search for Dibaryons in a Relativistic Model
A relativistic quark potential model is used to do a systematic search for
quasi-stable dibaryon states in the , , and three flavor world.
Flavor symmetry breaking and channel coupling effects are included and an
adiabatic method and fractional parentage expansion technique are used in the
calculations. The relativistic model predicts dibaryon candidates completely
consistent with the nonrelativistic model.Comment: 12 pages, latex, no figure
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