1,475 research outputs found
A caricature of a singular curvature flow in the plane
We study a singular parabolic equation of the total variation type in one
dimension. The problem is a simplification of the singular curvature flow. We
show existence and uniqueness of weak solutions. We also prove existence of
weak solutions to the semi-discretization of the problem as well as convergence
of the approximating sequences. The semi-discretization shows that facets must
form. For a class of initial data we are able to study in details the facet
formation and interactions and their asymptotic behavior. We notice that our
qualitative results may be interpreted with the help of a special composition
of multivalued operators
Compressing the cosmological information in one-dimensional correlations of the Lyman- forest
Observations of the Lyman- (Ly) forest from spectroscopic
surveys such as BOSS/eBOSS, or the ongoing DESI, offer a unique window to study
the growth of structure on megaparsec scales. Interpretation of these
measurements is a complicated task, requiring hydrodynamical simulations to
model and marginalise over the thermal and ionisation state of the
intergalactic medium. This complexity has limited the use of Ly
clustering measurements in joint cosmological analyses. In this work we show
that the cosmological information content of the 1D power spectrum
() of the Ly forest can be compressed into a simple
two-parameter likelihood without any significant loss of constraining power. We
simulate measurements from DESI using hydrodynamical
simulations and show that the compressed likelihood is model independent and
lossless, recovering unbiased results even in the presence of massive neutrinos
or running of the primordial power spectrum.Comment: Submitted to ApJ. 17 pages, 7 figure
Energy solutions to one-dimensional singular parabolic problems with data are viscosity solutions
We study one-dimensional very singular parabolic equations with periodic
boundary conditions and initial data in , which is the energy space. We
show existence of solutions in this energy space and then we prove that they
are viscosity solutions in the sense of Giga-Giga.Comment: 15 page
Identification of the water stress level in olive trees during pit hardening using the trunk growth rate indicator.
Water scarcity is generating an increasing interest in deficit irrigation scheduling. The trunk diameter fluctuations are daily cycles that have been suggested as tools for irrigation scheduling. The trunk growth rate (TGR) was suggested as the best indicator for olive trees during pit hardening. The aim of this work is to clarify how the TGR could be used to identify water stress levels. The experiment was performed during the 2017 season, in a commercial, super-high-density orchard in Carmona (Seville, Spain). Four different irrigation treatments were performed according to midday stem water potential values and TGR. The data obtained were very variable and both indicators presented a wide range of water status throughout the season. The maximum trunk diameter data clearly showed the pattern of the trees water status but the comparison between treatments and the identification of the water stress level was not possible. The average TGR was linked to the midday stem water potential, but with a minimum amount of data. Irrigation scheduling based on the average TGR was difficult because of the great increases in some daily TGR values. For clarity, the pool of data was grouped by midday stem water potential. These water stress levels were characterized using the weekly frequency of TGR values. The increase of water stress reduced the frequency of values between -0.1 and 0.3mm day-1 from 60% to less than 25%. Moderate water stress levels increased the percentage of values lower than -0.3mm day-1 from 7% to 37%. The most severe water stress conditions increased the TGR values between -0.3 and -0.1mm day-1 from 16% up to 22%.IRNASINSTITUTO DE LA GRASACSI
Elementos de la psicología; Elementos de filosofía moral
Recopilación de dos obras, Elementos de psicología y Elementos de filosofía moral, divididas en distintas lecciones que pretenden esclarecer lo que es la psicología y la filosofía y realizar una pequeña historia de las dos ciencias.Recopilación de dos obras, Elementos de psicología y Elementos de filosofía moral, divididas en distintas lecciones que pretenden esclarecer lo que es la psicología y la filosofía y realizar una pequeña historia de las dos ciencias
Exploring the independent association of employment status to cancer survivors’ health-related quality of life
Background: Having a job has been associated with better Health-Related Quality of Life (HRQOL) in cancer survivors. However, the sociodemographic and disease-related profiles characterizing the survivors being employed and those having better HRQOL largely overlap. The present study aims to discern the degree to which employment status is independently associated with cancer survivors' HRQOL or if it mainly reflects the impact of other sociodemographic and cancer-related variables.
Methods: Cross-sectional study on a heterogeneous sample of 772 working-age survivors of adult-onset cancer. An instrument specifically designed to assess HRQOL in cancer survivors and Multivariate Variance Analysis (MANOVA) were used.
Results: Survival phase, cancer type, and employment status showed the main effects on cancer survivors' HRQOL. In particular, being employed (vs unemployed) had the greatest positive association with HRQOL, affecting ten of the twelve HRQOL domains considered. Also, interaction effects highlighted the role of age (younger) and marital status (single) as risk factors for a greater negative impact of variables affecting the survivor's HRQOL.
Conclusions: The application of a multivariate methodology sheds new light on two relevant issues for the cancer survivor's HRQOL: (i) the existence of differences between diagnostic groups that are not attributed to other variables such as sex, and (ii) the important and independent role that employment status plays. Comprehensive cancer survivorship care should focus more on high-risk groups and include having a job as an essential aspect to consider and prompt. The fact that the employment status is susceptible to change represents a valuable opportunity to care for the wellbeing of this population
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