32,700 research outputs found
Electromagnetism in nonleptonic weak interactions
We construct a low-energy effective field theory that permits the complete
treatment of isospin-breaking effects in nonleptonic weak interactions to
next-to-leading order. To this end, we enlarge the chiral Lagrangian describing
strong and Delta S=1 weak interactions by including electromagnetic terms with
the photon as additional dynamical degree of freedom. The complete and minimal
list of local terms at next-to-leading order is given. We perform the one-loop
renormalization at the level of the generating functional and specialize to K
-> pi pi decays.Comment: 17 pages, 1 figure; 2 references added, final version for publication
in Nucl. Phys.
Even-Odd Correlation Functions on an Optical Lattice
We study how different many body states appear in a quantum gas microscope,
such as the one developed at Harvard [Bakr et al. Nature 462, 74 (2009)], where
the site-resolved parity of the atom number is imaged. We calculate the spatial
correlations of the microscope images, corresponding to the correlation
function of the parity of the number of atoms at each site. We produce analytic
results for a number of well-known models: noninteracting bosons, the large U
Bose-Hubbard model, and noninteracting fermions. We find that these parity
correlations tend to be less strong than density-density correlations, but they
carry similar information.Comment: 8 pages, 4 figures. Published versio
A singularity free analytical solution of artificial satellite motion with drag
The connection between the existing Delaunay-Similar and Poincare-Similar satellite theories in the true anomaly version is outlined for the J(2) perturbation and the new drag approach. An overall description of the concept of the approach is given while the necessary expansions and the procedure to arrive at the computer program for the canonical forces is delineated. The procedure for the analytical integration of these developed equations is described. In addition, some numerical results are given. The computer program for the algebraic multiplication of the Fourier series which creates the FORTRAN coding in an automatic manner is described and documented
Variation in relapse frequency and the transmission potential of Plasmodium vivax malaria
There is substantial variation in the relapse frequency of
Plasmodium vivax malaria, with fast-relapsing strains in
tropical areas, and slow-relapsing strains in temperate areas
with seasonal transmission. We hypothesize that much of the
phenotypic diversity in P. vivax relapses arises from selection
of relapse frequency to optimize transmission potential in a
given environment, in a process similar to the virulence
trade-off hypothesis. We develop mathematical models of P. vivax
transmission and calculate the basic reproduction number R0 to
investigate how transmission potential varies with relapse
frequency and seasonality. In tropical zones with year-round
transmission, transmission potential is optimized at
intermediate relapse frequencies of two to three months:
slower-relapsing strains increase the opportunity for onward
transmission to mosquitoes, but also increase the risk of being
outcompeted by faster-relapsing strains. Seasonality is an
important driver of relapse frequency for temperate strains,
with the time to first relapse predicted to be six to nine
months, coinciding with the duration between seasonal
transmission peaks. We predict that there is a threshold degree
of seasonality, below which fast-relapsing tropical strains are
selected for, and above which slow-relapsing temperate strains
dominate, providing an explanation for the observed global
distribution of relapse phenotypes
New urea-absorbing polymers for artificial kidney machines
Etherified polymer is made from modified cellulose derivative which is reacted with periodate. It will absorb 2 grams of urea per 100 grams of polymer. Indications are that polymers could be used to help remove uremic wastes in artificial kidneys, or they could be administered orally as therapy for uremia
Aldehyde-containing urea-absorbing polysaccharides
A novel aldehyde containing polymer (ACP) is prepared by reaction of a polysaccharide with periodate to introduce aldehyde groups onto the C2 - C3 carbon atoms. By introduction of ether and ester groups onto the pendant primary hydroxyl solubility characteristics are modified. The ACP is utilized to absorb nitrogen bases such as urea in vitro or in vivo
Quantum Google in a Complex Network
We investigate the behavior of the recently proposed quantum Google
algorithm, or quantum PageRank, in large complex networks. Applying the quantum
algorithm to a part of the real World Wide Web, we find that the algorithm is
able to univocally reveal the underlying scale-free topology of the network and
to clearly identify and order the most relevant nodes (hubs) of the graph
according to their importance in the network structure. Moreover, our results
show that the quantum PageRank algorithm generically leads to changes in the
hierarchy of nodes. In addition, as compared to its classical counterpart, the
quantum algorithm is capable to clearly highlight the structure of secondary
hubs of the network, and to partially resolve the degeneracy in importance of
the low lying part of the list of rankings, which represents a typical
shortcoming of the classical PageRank algorithm. Complementary to this study,
our analysis shows that the algorithm is able to clearly distinguish scale-free
networks from other widespread and important classes of complex networks, such
as Erd\H{o}s-R\'enyi networks and hierarchical graphs. We show that the ranking
capabilities of the quantum PageRank algorithm are related to an increased
stability with respect to a variation of the damping parameter that
appears in the Google algorithm, and to a more clearly pronounced power-law
behavior in the distribution of importance among the nodes, as compared to the
classical algorithm. Finally, we study to which extent the increased
sensitivity of the quantum algorithm persists under coordinated attacks of the
most important nodes in scale-free and Erd\H{o}s-R\'enyi random graphs
N/P GaAs concentrator solar cells with an improved grid and bushbar contact design
The major requirements for a solar cell used in space applications are high efficiency at AMO irradiance and resistance to high energy radiation. Gallium arsenide, with a band gap of 1.43 eV, is one of the most efficient sunlight to electricity converters (25%) when the the simple diode model is used to calculate efficiencies at AMO irradiance, GaAs solar cells are more radiation resistant than silicon solar cells and the N/P GaAs device has been reported to be more radiation resistant than similar P/N solar cells. This higher resistance is probably due to the fact that only 37% of the current is generated in the top N layer of the N/P cell compared to 69% in the top layer of a P/N solar cell. This top layer of the cell is most affected by radiation. It has also been theoretically calculated that the optimized N/P device will prove to have a higher efficiency than a similar P/N device. The use of a GaP window layer on a GaAs solar cell will avoid many of the inherent problems normally associated with a GaAlAs window while still proving good passivation of the GaAs surface. An optimized circular grid design for solar cell concentrators has been shown which incorporates a multi-layer metallization scheme. This multi-layer design allows for a greater current carrying capacity for a unit area of shading, which results in a better output efficiency
Static and dynamic structure factors in the Haldane phase of the bilinear-biquadratic spin-1
The excitation spectra of the T=0 dynamic structure factors for the spin,
dimer, and trimer fluctuation operators as well as for the newly defined center
fluctuation operator in the one-dimensional S=1 Heisenberg model wi th
isotropic bilinear and biquadratic exchange are
investigated via the recursion method for systems with up to N=18 site s over
the predicted range, , of the topologically ordered
Haldane phase. The four static and dynamic structure factors probe t he
ordering tendencies in the various coupling regimes and the elementary and
composite excitations which dominate the T=0 dynamics. At (VBS point), the dynamically relevant spectra in the invariant
subspaces with total spin are dominated by a branch of magnon
states , by continua of two-magnon scattering states , and by discrete branches of two-magnon bound states with positive
interaction energy . The dimer and trimer spectra at ar e
found to consist of single modes with -independent excitation energies
and , where is
the ground-state energy per site. The basic structure of the dynamically
relevant excitation spectrum remains the same over a substantial parameter
range within the Haldane phase. At the transition to the dimerized phase
(), the two-magnon excitations turn into two-spinon excitations.Comment: 12 pages, 4 Postscript figure
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