313 research outputs found
Equilibrium dynamics in two-sector models of endogenous growth.
This paper presents an account of the dynamics of endogenous growth models with physical capital and human capital. We consider some important extensions of the basic framework of Lucas (1988) and Uzawa (1964), including physical capital in the human capital technology and leisure activities as an additional argument of agents' welfare.Endogenous growth; Physical capital; Human capital; Long-term growth; Transitional dynamics;
Equilibrium dynamics in two-sector models of endogenous growth
This paper presents an account of the dynamics of endogenous growth models with physical capital and human capital. We consider some important extensions
of the basic framework of Lucas (1988) and Uzawa (1964), including physical capital in the human capital technology and leisure activities as an additional argument of agents' welfare
A two-sector model of endogenous growth with leisure
In this paper we analyze a class of endogenous growth models with physical and human capital and with three altematives uses of time: unqualified leisure, work and education. In contrast to some other related models, we find that, even in the absence of technological extemalities, there could be multiple balanced paths. We provide a characterization of the qualitative behavior of consumption, leísure, work and education over those balanced paths, and study their transitional dynamics
A two-sector model of endogenous growth with leisure.
In this paper we analyze a class of endogenous growth models with physical and human capital and with three altematives uses of time: unqualified leisure, work and education. In contrast to some other related models, we find that, even in the absence of technological extemalities, there could be multiple balanced paths. We provide a characterization of the qualitative behavior of consumption, leísure, work and education over those balanced paths, and study their transitional dynamics.
Imágenes en oncología: generalidades y aplicaciones
ResumenLas imágenes tienen un rol fundamental en la oncología actual, que incluye el diagnóstico, etapificación, evaluación de respuesta al tratamiento y diagnóstico de complicaciones. El examen de mayor importancia en estos pacientes es la Tomografía Computada, que tiene un alto rendimiento y resolución espacial, es rápida y disponible en los distintos centros. Otros exámenes son de ayuda complementaria como el Ultrasonido y la Resonancia Magnética. Los estudios metabólicos, y especialmente los de tipo híbrido como el PET/CT, han mejorado la sensibilidad y especificidad en el estudio de diversas neoplasias, tanto en la etapificación, como en el control de tratamiento y seguimiento. En el futuro, con nuevas técnicas, podremos diagnosticar cánceres en una etapa muy precoz, incluso antes de que se manifiesten clínicamente.SummaryImaging has a pivotal role in oncology, including diagnosis, staging, response assessment to therapy and the diagnosis of complications. The most important modality is Computed Tomography, with high accuracy and spatial resolution, fast and not so expensive. Other modalities are Ultrasound and Magnetic Resonance. Metabolic studies such as PET/CT have high accuracy in staging, and follow up of different cancers. In the future, newer techniques will be available in order to diagnose even smaller asymptomatic cancers
Simulation Study of Chic -> J/Psi + gamma Detection with J/Psi -> e+ e- in pp Collisions
We present Monte Carlo preliminary results about the feasibility to detect
the Chic family in p-p collisions at 14 TeV in the ALICE Central Barrel at CERN
LHC. The Chic1 and Chic2 were forced to decay in the channel J/Psi + gamma ->
e+ e- + gamma and were merged with a proton-proton non-biased collision. After
MonteCarlo transport and simulation of the detector response, the e+, e- and
converted gamma were reconstructed and identified in the ALICE ITS, TPC and TRD
detectors. Separate signals corresponding to gamma from Chic1 and from Chic2
were observed. The position and relative weight of the fit to gaussians agreed
with the input values within the statistical limits. Similar studies will be
done for Pb-Pb collisions
Transport through a quantum wire with a side quantum-dot array
A noninteracting quantum-dot array side-coupled to a quantum wire is studied.
Transport through the quantum wire is investigated by using a noninteracting
Anderson tunneling Hamiltonian. The conductance at zero temperature develops an
oscillating band with resonances and antiresonances due to constructive and
destructive interference in the ballistic channel, respectively. Moreover, we
have found an odd-even parity in the system, whose conductance vanishes for an
odd number of quantum dots while becomes for an even number. We
established an explicit relation between this odd-even parity, and the
positions of the resonances and antiresonances of the conductivity with the
spectrum of the isolated QD arrayComment: 5 pages, 4 figures, submitted to PR
Ibuprofen-loaded calcium phosphate granules : combination of innovative characterization methods to relate mechanical strength to drug location
This paper studies the impact of the location of a drug substance on the physicochemical and mechanical properties of two types of calcium phosphate granules loaded with seven different contents of ibuprofen, ranging from 1.75% to 46%. These implantable agglomerates were produced by either low or high shear granulation. Unloaded Mi-Pro pellets presented higher sphericity and mechanical properties, but were slightly less porous than Kenwood granules (57.7% vs 61.2%). Nevertheless, the whole expected quantity of ibuprofen could be integrated into both types of granules. A combination of surface analysis, using near-infrared (NIR) spectroscopy coupling chemical imaging, and pellet porosity, by mercury intrusion measurements, allowed ibuprofen to be located. It was shown that, from 0% to 22% drug content, ibuprofen deposited simultaneously on the granule surface, as evidenced by the increase in surface NIR signal, and inside the pores, as highlighted by the decrease in pore volume. From 22%, porosity was almost filled, and additional drug substance coated the granule surfaces, leading to a large increase in the surface NIR signal. This coating was more regular for Mi-Pro pellets owing to their higher sphericity and greater surface deposition of drug substance. Unit crush tests using a microindenter revealed that ibuprofen loading enhanced the mechanical strength of granules, especially above 22% drug content, which was favorable to further application of the granules as a bone defect filler
Conductance and persistent current of a quantum ring coupled to a quantum wire under external fields
The electronic transport of a noninteracting quantum ring side-coupled to a
quantum wire is studied via a single-band tunneling tight-binding Hamiltonian.
We found that the system develops an oscillating band with antiresonances and
resonances arising from the hybridization of the quasibound levels of the ring
and the coupling to the quantum wire. The positions of the antiresonances
correspond exactly to the electronic spectrum of the isolated ring. Moreover,
for a uniform quantum ring the conductance and the persistent current density
were found to exhibit a particular odd-even parity related with the ring-order.
The effects of an in-plane electric field was also studied. This field shifts
the electronic spectrum and damps the amplitude of the persistent current
density. These features may be used to control externally the energy spectra
and the amplitude of the persistent current.Comment: Revised version, 7 pages and 9 figures. To appear in Phys. Rev.
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