6,259 research outputs found
Searching for Effects of Spatial Noncommutativity via Chern-Simons' Processes
The possibility of testing spatial noncommutativity in the case of both
position-position and momentum-momentum noncommuting via a Chern-Simons'
process is explored. A Chern-Simons process can be realized by an interaction
of a charged particle in special crossed electric and magnetic fields, in which
the Chern-Simons term leads to non-trivial dynamics in the limit of vanishing
kinetic energy. Spatial noncommutativity leads to the spectrum of the orbital
angular momentum possessing fractional values. Furthermore, in both limits of
vanishing kinetic energy and subsequent vanishing magnetic field, the
Chern-Simons term leads to this system having non-trivial dynamics again, and
the dominant value of the lowest orbital angular momentum being ,
which is a clear signal of spatial noncommutativity. An experimental
verification of this prediction by a Stern-Gerlach-type experiment is
suggested.Comment: 18 page
One way to Characterize the compact structures of lattice protein model
On the study of protein folding, our understanding about the protein
structures is limited. In this paper we find one way to characterize the
compact structures of lattice protein model. A quantity called Partnum is given
to each compact structure. The Partnum is compared with the concept
Designability of protein structures emerged recently. It is shown that the
highly designable structures have, on average, an atypical number of local
degree of freedom. The statistical property of Partnum and its dependence on
sequence length is also studied.Comment: 10 pages, 5 figure
Distinguishing a set of full product bases needs only projective measurements and classical communication
Nonlocality without entanglement is an interesting field. A manifestation of
quantum nonlocality without entanglement is the local indistinguishability of a
set of orthogonal product states. In this paper we analyze the character of
operators to distinguish a set of full product bases in a multi-partite system,
and show that distinguishing perfectly a set of full product bases needs only
local projective measurements and classical communication, and these
measurements cannot damage each product basis. Employing these conclusions one
can discuss local distinguishability of full product bases easily. Finally we
discuss the generalization of these results to the locally distinguishability
of a set of incomplete product bases
Rodent Biology and Management; Abstracts of papers presented at the International Conference on Rodent Biology and Management, held at Beijing, China, 5-9 October 1998
Farm Management,
Primeiros resultados de milho e caupi cultivados em uma área de mata secundária com e sem emprego de fogo.
bitstream/item/57595/1/CPATU-ComTec53.pd
Enhanced flux pinning in YBa2Cu3O7-d films by nano-scaled substrate surface roughness
Nano-scaled substrate surface roughness is shown to strongly influence the
critical current density Jc in YBCO films made by pulse-laser-deposition on the
crystalline LaAlO3 substrates consisting of two separate twin-free and
twin-rich regions. The nano-scaled corrugated surface was created in the
twin-rich region during the deposition process. Using magneto-optical imaging
techniques coupled with optical and atomic force microscopy, we observed an
enhanced flux pinning in the YBCO films in the twin-rich region, resulted in
\~30% increase in Jc, which was unambiguously confirmed by the direct transport
measurement.Comment: 16 pages, 3 figures, accepted by Applied Physics Letter
Stillbirth should be given greater priority on the global health agenda
Stillbirths are largely excluded from international measures of mortality and morbidity. Zeshan Qureshi and colleagues argue that stillbirth should be higher on the global health agenda
Measure representation and multifractal analysis of complete genomes
This paper introduces the notion of measure representation of DNA sequences.
Spectral analysis and multifractal analysis are then performed on the measure
representations of a large number of complete genomes. The main aim of this
paper is to discuss the multifractal property of the measure representation and
the classification of bacteria. From the measure representations and the values
of the spectra and related curves, it is concluded that these
complete genomes are not random sequences. In fact, spectral analyses performed
indicate that these measure representations considered as time series, exhibit
strong long-range correlation. For substrings with length K=8, the
spectra of all organisms studied are multifractal-like and sufficiently smooth
for the curves to be meaningful. The curves of all bacteria
resemble a classical phase transition at a critical point. But the 'analogous'
phase transitions of chromosomes of non-bacteria organisms are different. Apart
from Chromosome 1 of {\it C. elegans}, they exhibit the shape of double-peaked
specific heat function.Comment: 12 pages with 9 figures and 1 tabl
Representation Class and Geometrical Invariants of Quantum States under Local Unitary Transformations
We investigate the equivalence of bipartite quantum mixed states under local
unitary transformations by introducing representation classes from a
geometrical approach. It is shown that two bipartite mixed states are
equivalent under local unitary transformations if and only if they have the
same representation class. Detailed examples are given on calculating
representation classes.Comment: 11 page
- …