Placa funerária romana da Herdade da Comenda Grande (Conventus Pacensis)

O volume não tem número de página. A inscrição é o nº 527.Estuda-se uma placa funerária romana, dedicada pela mãe à filha, datável da primeira metade do séc. I da nossa era. Aponta-se como indício do importante papel desempenhado pela mulher na sociedade de então

Investigação universitária: alguns pontos focais

info:eu-repo/semantics/publishedVersio

The application of the equivalent annulus width concept in thermal diffusion separations

The equivalent annulus width concept is used to characterize a small commercial thermogravitational hermal diffusion column and its validity checked experimentally by separating batchwise in the column mixtures of n-heptanebenzene with different initial concentrations. The equation of Ruppell and Coull was used to analyse the data in the short separation times range and determine the equivalent annulus width. Good agreement was obtained between the experimental and predicted time-separation curves when using the equivalent annulus width value and on averaged value of the thermal diffusion constant. A new method is presented for the simultaneous determination of the equivalent annulus width and the thermal diffusion constant of a binary mixture from a single set of experimental data

Consideraciones acerca del perfil del egresado

En momentos tales en que con mayor intensidad algunas personas pretenden hacer abortar la participación activa de los hombres en el movimiento histórico mediante el descomunal y brutal despliegue armado y que con violenta fuerza se intenta desmoronar los últimos fundamentos de nuestra idiosincrasia y cultura pero, a la par, el progreso científico influye -con mayor ahínco en todo el conjunto de procesos sociales, a lo cual no es ajena nuestra Universidad Nacional y por ende nuestra facultad y sabiendo, además, que están ustedes empeñados en el análisis y vigilia de la academia, me he permitido poner a su digna consideración este conjunto ordenado de conceptos e ideas, originado en nuestro cotidiano estudio y quehacer docente, así como en nuestras experiencias de estudiante, años ha, en este venerable claustro, con la única pretensión, quizá atrevida, de aportar minúscula mente a la inmensa y noble tarea a ustedes encomendada

Low genetic diversity associated with low prevalence of Anaplasma marginale in water buffaloes in Marajó Island, Brazil

The rickettsia Anaplasma marginale is the etiologic agent of bovine anaplasmosis, an important tick-borne disease affecting cattle in tropical and subtropical regions of the world. In endemic regions, the genetic diversity of this pathogen is usually related to the high prevalence of the disease in cattle. The major surface protein 1 alpha (MSP1a) has been used as a marker to characterize the genetic diversity and for geographical identification of A. marginale strains. The present study reports the characterization of A. marginale MSP1a diversity in water buffaloes. Blood samples were collected from 200 water buffaloes on Marajó Island, Brazil where the largest buffalo herd is located in the Western hemisphere. Fifteen buffaloes (7.5%) were positive for A. marginale msp1α by PCR. Four different strains of A. marginale with MSP1a tandem repeat structures (4-63-27), (162-63-27), (78-24-24-25-31) and (τ-10-10-15) were found, being (4-63-27) the most common. MSP1a tandem repeats composition in buffalos and phylogenetic analysis using msp1α gene showed that the A. marginale strains identified in buffaloes are closely related to A. marginale strains from cattle. The results demonstrated low genetic diversity of A. marginale associated with low bacterial prevalence in buffaloes and suggested that buffaloes may be reservoirs of this pathogen for cattle living in the same area. The results also suggested that mechanical transmission and not biological transmission by ticks might be playing the major role for pathogen circulation among water buffaloes in Marajó Island, Brazil.We thank the Coordination for the Improvement of Higher Education Personnel (CAPES) foundation and the National Council for Technological and Scientific Development (CNPq) for their financial support.Peer Reviewe

The validity of the Hoffman and Emery equation in thermal diffusion

The most widely used equation in thermal diffusion is discussed in what concerns its range of validity. It is shown that when the separation curves are non-symmetrical with respect to the initial composition the error involved in the Hoffman and Emery equation when using a value of t=0.3 tr for the lower limit of the time, may be significantly larger than those predicted by their original authors. Experimental cases described in the literature are discussed on the light of previous analysis

Influence of Grain Size Dispersion on the Magnetic Properties of Nanogranular BaTiO3-CoFe2O4 Thin Films

Thin film nanogranular composites of cobalt ferrite (CoFe2O4) dispersed in a barium titanate (BaTiO3) matrix were deposited by laser ablation with different cobalt ferrite concentrations (x). Their structural and magnetic properties were characterized. The films were polycrystalline and composed by a mixture of tetragonal-BaTiO3 and CoFe2O4 with the cubic spinel structure. A slight (111) barium titanate phase orientation and (311) CoFe2O4 phase orientation were observed. The lattice parameter of the CoFe2O4 was always smaller than the bulk value indicating that the cobalt ferrite was under compressive stress. From atomic force microscopy a broad distribution of grain sizes was observed in the nanocomposites, with a significant amount of smaller grains (<40nm) from the CoFe2O4 phase. The magnetic measurements show an increase of the magnetic moment from the low concentration region where the magnetic grains are more isolated and their magnetic interaction is small, towards the bulk value for higher CoFe2O4 content in the films. A corresponding decrease of coercive field with increasing cobalt ferrite concentration was also observed, due to the higher inter-particle magnetic interaction (and reduced stress) of the agglomerated grains.This work has been financially supported by the Portuguese Foundation for Science and Technology (FCT) and FEDER, through the project POCI/CTM/60181/2004

Nonsymmetrical separations in thermal diffusion columns

The influence of the feed composition upon the actual degrees of separation attained at the top and bottom sections of a thermogravitational column is discussed using the classical phenomenological theory of Furry, Jones, and Onsager. It is shown that, except for a feed composition of C 0 = 0.5 (mass fraction), the separation profile is nonsymmetric, i.e., the separations in the top and bottom sections of the column are nonsymmetric with respect to the feed composition, the asymmetry increasing as the feed composition moves away from C 0 = 0.5. An equation for the determination of the optimum feed location as a function of the feed composition is derived

Using Model Cards for ethical reflection on machine learning models: an interview-based study

How do tools designed for documenting machine learning models contribute to developers’ ethical reflection? We set out to answer this question regarding Model Cards, a tool proposed for such purpose. We conducted a thematic analysis of eight semi-structured interviews based on speculative design sessions. Each participant assumed the role of developer of an artificial intelligence model in one of two scenarios: loan applications or university admissions. We found evidence that designers may have been selective about which ethical issues – from among those they had reflected on – they recorded in the Model Cards. While participants were hesitant to grant full autonomy to the artifact to be developed, we identified they still tended to rely on a third party (outside the design team) to mediate the relationship between the system and other stakeholders. Our findings contribute to our understanding of documentation tools, their epistemic value, and how they can be leveraged to engage in a more ethically informed design process of artificial intelligence systems

Paradoxical skin reaction with infliximab treatment

Considering the increased utilization of anti-TNF medications in the treatment of inflammatory and autoimmune diseases, dermatologists should be aware of the possible adverse skin reactions. We describe a case of inverted psoriasis due to the use of infliximab used in the treatment of inflammatory bowel disease.Com o aumento do uso de anti-TNF no tratamento de doenças inflamatórias e auto-imunes, os dermatologistasdevem estar conscientes da possibilidade de reações cutâneas adversas. Apresentamos umcaso de psoríase invertida devido ao uso de infliximab utilizado no tratamento da doença inflamatóriaintestinal