1,850 research outputs found
One Dimensional Magnetized TG Gas Properties in an External Magnetic Field
With Girardeau's Fermi-Bose mapping, we have constructed the eigenstates of a
TG gas in an external magnetic field. When the number of bosons is
commensurate with the number of potential cycles , the probability of this
TG gas in the ground state is bigger than the TG gas raised by Girardeau in
1960. Through the comparison of properties between this TG gas and Fermi gas,
we find that the following issues are always of the same: their average value
of particle's coordinate and potential energy, system's total momentum,
single-particle density and the pair distribution function. But the reduced
single-particle matrices and their momentum distributions between them are
different.Comment: 6 pages, 4 figure
Time-domain THz spectroscopy reveals coupled protein-hydration dielectric response in solutions of native and fibrils of human lyso-zyme
Here we reveal details of the interaction between human lysozyme proteins,
both native and fibrils, and their water environment by intense terahertz time
domain spectroscopy. With the aid of a rigorous dielectric model, we determine
the amplitude and phase of the oscillating dipole induced by the THz field in
the volume containing the protein and its hydration water. At low
concentrations, the amplitude of this induced dipolar response decreases with
increasing concentration. Beyond a certain threshold, marking the onset of the
interactions between the extended hydration shells, the amplitude remains fixed
but the phase of the induced dipolar response, which is initially in phase with
the applied THz field, begins to change. The changes observed in the THz
response reveal protein-protein interactions me-diated by extended hydration
layers, which may control fibril formation and may have an important role in
chemical recognition phenomena
Tau energy losses at ultra-high energy: continuous versus stochastic treatment
We study the energy losses of the tau lepton in matter through
electromagnetic processes at ultra-high energy (UHE). We use both a stochastic
and a continuous framework to treat these interactions and compare the flux of
tau leptons propagated after some amount of matter. We discuss the accuracy of
the approximation of continuous energy losses by studying the propagation in
standard rock of taus with both mono-energetic and power law injection spectra.Comment: 7 pages, 8 figure
Efecto de la inclusión de distintas fuentes de grasa en dietas para pollos broiler sobre el perfil lipÃdico de la carne, la grasa abdominal y la piel
Se realizó una prueba experimental con 600 pollos broiler de la estirpe comercial Arbor-Acres, alimentándoles con dietas suplementadas con un 8% de sebo (S) , aceite de palma (AP) y oleina de soja-girasol (OSG). Al final del periodo productivo, los animales, con 49 dÃas de vida, fueron sacrificados en un matadero comercial, seleccionándose las canales de los 10 animales, de cada tratamiento, con el peso vivo más próximo al valor medio del correspondiente tratamiento, para su posterior dissección y toma de pechugas, muslos, y muestras de grasa abdominal y piel. Todas las muestras se conservaron a -20°C hasta la realización de los correspondientes análisis cromatográficos. Los animales que habÃan consumido la dieta suplementada con OSG mostraron, en los tejidos analizados, los niveles más altos de ácido linoleico (C18:2) asà como un mayor grado de insaturación. Los tejidos de los animales alimentados con AP y S contenÃan mayores proporciones de ácido palmÃtico (C16:0) y ácido oleico (C18:l), respectivamente
Gamma rays from microquasars Cygnus X-1 and Cygnus X-3
Gamma-ray observations of microquasars at high and very-high energies can
provide valuable information of the acceleration processes inside the jets, the
jet-environment interaction and the disk-jet coupling. Two high-mass
microquasars have been deeply studied to shed light on these aspects: Cygnus
X-1 and Cygnus X-3. Both systems display the canonical hard and soft X-ray
spectral states of black hole transients, where the radiation is dominated by
non-thermal emission from the corona and jets and by thermal emission from the
disk, respectively. Here, we report on the detection of Cygnus X-1 above 60 MeV
using 7.5 yr of Pass8 Fermi-LAT data, correlated with the hard X-ray state. A
hint of orbital flux modulation was also found, as the source is only detected
in phases around the compact object superior conjunction. We conclude that the
high-energy gamma-ray emission from Cygnus X-1 is most likely associated with
jets and its detection allow us to constrain the production site. Moreover, we
include in the discussion the final results of a MAGIC long-term campaign on
Cygnus X-1 that reaches almost 100 hr of observations at different X-ray
states. On the other hand, during summer 2016, Cygnus X-3 underwent a flaring
activity period in radio and high-energy gamma rays, similar to the one that
led to its detection in the high-energy regime in 2009. MAGIC performed
comprehensive follow-up observations for a total of about 70 hr. We discuss our
results in a multi-wavelength context.Comment: Proceedings of the 35th International Cosmic Ray Conference (ICRC
2017), Bexco, Busan, Korea (arXiv:1708.05153
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