10,252 research outputs found
Product vacua with boundary states
We introduce a family of quantum spin chains with nearest-neighbor
interactions that can serve to clarify and refine the classification of gapped
quantum phases of such systems. The gapped ground states of these models can be
described as a product vacuum with a finite number of particles bound to the
edges. The numbers of particles, n_L and n_R, that can bind to the left and
right edges of the finite chains serve as indices of the particular phase a
model belongs to. All these ground states, which we call Product Vacua with
Boundary States (PVBS) can be described as Matrix Product States (MPS). We
present a curve of gapped Hamiltonians connecting the AKLT model to its
representative PVBS model, which has indices n_L=n_R=1. We also present
examples with n_L=n_R=J, for any integer J\geq 1, that are related to a
recently introduced class of SO(2J+1)-invariant quantum spin chains.Comment: New section on SO(2J+1)-invariant model
Two-State Folding, Folding through Intermediates, and Metastability in a Minimalistic Hydrophobic-Polar Model for Proteins
Within the frame of an effective, coarse-grained hydrophobic-polar protein
model, we employ multicanonical Monte Carlo simulations to investigate
free-energy landscapes and folding channels of exemplified heteropolymer
sequences, which are permutations of each other. Despite the simplicity of the
model, the knowledge of the free-energy landscape in dependence of a suitable
system order parameter enables us to reveal complex folding characteristics
known from real bioproteins and synthetic peptides, such as two-state folding,
folding through weakly stable intermediates, and glassy metastability.Comment: 10 pages, 1 figur
Habanera : The Pearl of Madrid
https://digitalcommons.library.umaine.edu/mmb-ps/2403/thumbnail.jp
Les Sylphes : Impromptu Valse
https://digitalcommons.library.umaine.edu/mmb-ps/3180/thumbnail.jp
La Cigale : The Grasshopper
https://digitalcommons.library.umaine.edu/mmb-ps/1212/thumbnail.jp
Vaccination of Cows with a Combined Rotavirus/Enterotoxigenic "E. Coli" K99 Vaccine to Protect Newborn Calves Against Diarrhoea
Potential neoplasm inhibitors
The historical portion of this paper is designed to show the value of mustard compounds in the treatment of cancer and the methods used to take advantage of various exploit able variants between normal tissue and cancerous tissue.
The experimental section is an effort to evaluate and take advantage of the variant of pH
Les Hirondelles : The Swallows
https://digitalcommons.library.umaine.edu/mmb-ps/1230/thumbnail.jp
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