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Design of complex profile extrusion dies through numerical modeling

The achievement of a balanced flow is one of the major tasks encompassed in the design of profile extrusion dies [1]. For this purpose numerical modeling codes may be a very useful aid. The research team involved in this work has been working during the last decade on the development of numerical tools to aid the conception of extrusion dies [1,2]. The design code developed so far carries out the automatic sear...

A rare cause of pericardial disease

Among cardiovascular diseases, pericardial disease has specific characteristics. Its etiology, diagnosis and medical management are not as well understood as in coronary and valvular heart disease. In most cases, its cause is benign, although the proportion decreases with more severe clinical presentation. The authors present the case of a 35-year-old man with no relevant past medical history, who went to the e...

A rare cause of pericardial disease

Among cardiovascular diseases, pericardial disease has specific characteristics. Its etiology, diagnosis and medical management are not as well understood as in coronary and valvular heart disease. In most cases, its cause is benign, although the proportion decreases with more severe clinical presentation. The authors present the case of a 35-year-old man with no relevant past medical history, who went to the e...

Zinc(II) phthalocyanines immobilized in mesoporous silica Al-MCM-41 and their a...

In the present study the authors investigated a set of three new zinc(II) phthalocyanines (zinc(II) tetranitrophthalocyanine (ZnTNPc), zinc(II) tetra(phenyloxy)phthalocyanine (ZnTPhOPc) and the tetraiodide salt of zinc(II)tetra(N,N,N-trimethylaminoethyloxy) phthalocyaninate (ZnTTMAEOPcI)) immobilized into Al-MCM-41 prepared via ship-in-a-bottle methodology. The samples were fully characterized by diffuse reflec...

Avaliação da prevalência e caracterização da rinossinusite nos cuidados de saúd...

Abstract: To determine RS prevalence, diagnosed at the Portuguese Primary Health Care Centres (PHCC), and to assess diagnostic and treatment practices. Study Design: Epidemiologic, cross-sectional study. Material and Methods:A cohort of subjects attending general practice medical appointments, in selected PHCC, was evaluated. Results: Between May/2008 and June/2009, 1,201 subjects were included with a mean age ...

Flow balancing in complex geometry profiles extrusion dies

One of the most complex tasks involved in the design of profile extrusion dies, is to obtain a balanced flow, which can be simplified through the employment of numerical modelling tools [1]. This work is part of a broader project that has been developed during the last years [1,2], and comprises the development of adequate numerical modelling codes to aid the design of extrusion dies. The initial version of the...

Numerical modelling code based on the finite volume method in unstructured grids

In this work, the implementation employed in the new modeling code is described. It is based on the FVM with on a SIMPLE type scheme suitable for unstructured meshes.

Study of the piezoresistivity of doped nanocrystalline silicon thin films

The piezoresistive response of n- and p-type hydrogenated nanocrystalline silicon thin films, deposited by hot-wire (HW) and plasma-enhanced chemical vapor deposition (PECVD) on thermally oxidized silicon wafers, has been studied using four-point bending tests. The piezoresistive gauge factor (GF) was measured on patterned thin-film micro-resistors rotated by an angle θ with respect to the principal strain axis...

Development of numerical tools to aid the design of complex geometry profile ex...

The research team of this work is involved since the mid-nineties on the development of computational tools to aid the design of profile extrusion dies. Initially, the numerical code employed was based on structured meshes that limited its application to simple geometries. The work planned in this PhD programme comprises the development of a numerical modelling code able to deal with unstructured meshes and its...

Computer aided design of extrusion forming tools complex geometry profiles