689 research outputs found
Ontologies, Mental Disorders and Prototypes
As it emerged from philosophical analyses and cognitive research, most concepts exhibit typicality effects, and resist to the efforts of defining them in terms of necessary and sufficient conditions. This holds also in the case of many medical concepts. This is a problem for the design of computer science ontologies, since knowledge representation formalisms commonly adopted in this field do not allow for the representation of concepts in terms of typical traits. However, the need of representing concepts in terms of typical traits concerns almost every domain of real world knowledge, including medical domains. In particular, in this article we take into account the domain of mental disorders, starting from the DSM-5 descriptions of some specific mental disorders. On this respect, we favor a hybrid approach to the representation of psychiatric concepts, in which ontology oriented formalisms are combined to a geometric representation of knowledge based on conceptual spaces
Cosmic Birefringence as a probe of dark matter nature: Sterile neutrino and dipolar dark matter
Recently, non-zero rotation angle
[Phys. Rev. Lett. \textbf{128}, no.9, 091302 (2022)] has
been reported for linear polarization of cosmic microwave background (CMB)
radiation, which is known as cosmic birefringence (CB). We used this
birefringence angle of CMB to study and distinguish different candidates of
dark matter (DM), e.g., dipolar and sterile neutrino DM. We calculated CMB
forward scattering by those probable candidates of DM to generate in
the presence of primordial scalar fluctuations' background. We explicitly
plotted bounds on the mass and electromagnetic coupling for different sectors
of DM, sterile neutrino, and dipolar DM, and compared them with other
experimental bounds. Regarding dipolar DM, our calculations put a bound on the
Majorana magnetic dipole moment about . In the case of sterile neutrino DM, the bound on the mass and
mixing angle was estimated at , which can be a
new constraint for sterile neutrino DM whose production mechanism is motivated
by models with a hidden sector coupled to the sterile neutrino. Based on our
results, if the constraint on the mass and the electromagnetic coupling for DM
must be within the allowed region, none of the considered candidates can
compensate for all the observed CB angles. We also discussed the maximum
contribution of the CB angle via CMB forward scattering by different sectors of
the dark matter.Comment: Published versio
Consistency of Gravity with the Cosmological Observations in Palatini Formalism
In this work we study the dynamics of universe in
modified gravity with Palatini formalism. We use data from recent observations
as Supernova Type Ia (SNIa) Gold sample and Supernova Legacy Survey (SNLS)
data, size of baryonic acoustic peak from Sloan Digital Sky Survey (SDSS), the
position of the acoustic peak from the CMB observations and large scale
structure formation (LSS) from the 2dFGRS survey to put constraint on the
parameters of the model. To check the consistency of this action, we compare
the age of old cosmological objects with the age of universe. In the combined
analysis with the all the observations, we find the parameters of model as
and
.Comment: 12 pages, 7 figure
Effect of Crumble-Pellet and Mash Diets with Different Levels of Dietary Protein and Energy on the Performance of Broilers at the End of the Third Week
This experiment was conducted to investigate the effect of the form of diets with different levels of protein and energy on broilers performance at the end of the third week. A total of 2800 male broiler chicks were fed with two forms of diet (mash and crumble-pellet), two levels of protein (23% and 21% CP), and two levels of energy (3200 and 3000 Kcal/Kg ME) from 1 to 21 days of age. The bodyweight (BW) and Feed conversion rate (FCR) were affected by the form of diet with the crumble-pellet form being better (P < .001). The diet with high protein significantly increased BW and decreased FCR (P < .001). The different levels of energy did not affect FCR and BW in crumble-pellet diet but should a significant effect on them in mash diet (P < .05). There were no significant interactions for any of the parameters tested except for interactions between energy and feed form. BW and FCR were improved by energy when diets were fed in the mash form (unlike the crumble-pellet form) at all ages. It is concluded that feeding crumble-pellets from 1 to 21 days of age improved BW and FCR and that an increase in the protein (unlike energy) content of the diet increased the performance of the chickens at the end of the third week
- …