Variscan shear zones and control of Sn-W, Au, U mineralizations in the Central-Iberian Zone in Portugal

[Resumo] Propoese urna síntese sobre a génese dos cisalhamentos regionais e estruturas secundárias associadas nas diferentes fases colisionais, para o sector restricto da Zona Centro-Ibérica (Z.C.!.) da orogenia hercínica. Adoptam-se os conceitos de RAMSAY (1980) e SANDERSON &MARCHINI (1984) para enquadrar, respectivamente, a tipologia e cinemática destes cisalhamentos. Esboçase um cenário geral da geometria e cinemática das estructuras na Z.C.!., concomitantemente, com a evolu~ao dos cisalhamentos tangenciais nas fases precocese com os cisalhamentos transcorrentes nas fases tardias do orógeno. No quadro da associa~ao espacial das mineralizag:>es de Sn-W, Au e U aos cisalhamentos, define-se o controlo estrutural destas mineraliza~oes e procede-se a tentativa de hierarquizar as referidas mineralizag:>es da Z.C.!., conectando-as as diferentes fases de deformaçao da orogenia hercínica[Abstract] The tipology and kinematic evolution of the shear zones and related secondary structures in the Central Iberian Zone (Variscan orogeny) are stablished on the basis of the concepts expressed, respectively, by RAMSAY (1980) and SANDERSON & MARCHINI (1984). The geometry and kinematics of these structures are linked to the evolution of nappes in the preliminary deformation phases and with transcurrent shearing in the later deformation phases. The structural control and the spatial relationship of Sn-W, Au and U mineralizations by these shears, is defined. For each her cynian deformations phase it is made an atempt of hierarchyzation of these C.I.Z. mineralizations

Building up Undergraduate Skills – empirical evidence from a Portuguese University

This study presents preliminary results of the PSP Project, addressing students' soft skills development within the context of HEI. Theoretical framework is grounded in Person-Environment Fit theories (Rounds & Hesketh, 1994), and also in Evans (2001) starfish model. Study 1 aimed to identify Economics and Business graduates' Market-Valued Skills Profile, collecting data through semi-structured interviews with HR managers and former students focus groups. Study 2 assessed students' confidence level regarding skills using a self-report questionnaire (Miles & Grummon, 2006). Career development representations were also assessed (Savickas, 2002; Gonçalves, 2006). Additional data was collected through open-ended questions focusing on work and other extracurricular experiences. Results from Study 1 highlight soft skills as multidimensional construct where different interrelated skills contribute to graduates' employability. Study 2 reveals students' positive self-perception regarding those skills, although limited vocational experiences were reported.Soft Skills, Career development, higher education students; employability

Simple and complex modelling of timber-framed masonry walls in Pombalino buildings

Timber-framed masonry has been developed as an effective lateral-load resisting system in regions of high seismicity such as Southern Europe. A salient feature of the ‘last generation’ of timber-framed (TF) buildings is the presence of diagonal members that may consist of two diagonal braces. The present study focusses on alternative modelling procedures, ranging from simple to rather complex, for this interesting type of traditional structure. All models are applied to study the behaviour of full-scale specimens of diagonally-braced TF panels. The complex model is based on plasticity with contact surfaces for the connection between timber diagonals and masonry infills. A parametric analysis using this model shows that masonry infills affect only slightly the lateral force carried by this TF panel configuration. Furthermore, two simple modelling techniques are put forward for application in the analysis of large, realistic structures incorporating TF walls. The first one is directly connected to the complex modelling and is based on substructuring. A nine-step procedure is developed and is found to properly reproduce the response of the test specimens. The second simple model is a phenomenological one, developed on the basis of observed behaviour during tests and is a complete hysteretic model; however, for comparison purposes, all models are evaluated here with respect to the prediction of the envelope (pushover) curve for the walls tested under lateral loads

Atypical Cogan’s Syndrome

Background. Cogan's syndrome is a rare clinical entity whose etiopathology is still unknown, and the treatment strategies are not clearly defined. Case. A 23-year-old male presented with symptoms of headache, peripheral facial palsy, persistent right hearing loss and bilateral papillitis. Workup excluded all infectious, granulomatous, neoplastic, and immune causes. The diagnosis of atypical Cogan's syndrome was established, and the patient was treated with systemic corticosteroids and later on with cyclophosphamide and methotrexate. There were improvement of visual symptoms and stabilisation of left hearing. Conclusion. Cogan's syndrome is a very rare disease with no specific biological tests for the diagnosis. The diagnostic exams are mostly important to exclude other etiologies. The atypical ocular and audiovestibular manifestations make the diagnosis difficult, delaying the institution of appropriate therapy which may result in profound bilateral deafness

Conjunctival lymphangioma: a case report and brief review of the literature

Background. Lymphangioma is a rare venolymphatic lesion, characterized by dilation of lymphatic vessels. It may occur as an isolated lesion or, more often, represent the surface component of a deep orbital lymphangioma. Case. We report a case of a conjunctival lymphangioma on a 58-year-old male that had simultaneously an upper respiratory tract infection. Excision and biopsy confirmed the nature of the lesion, and there has been no relapse to date. Conclusion. Conjunctival lymphangioma is a rare condition in which the diagnose, must be kept in mind in patients with a red eye resistance to topical therapy and in association with an upper respiratory tract infection. Finally, it is also necessary to be aware of possible recurrence of the lesion

Photodynamic therapy for diffuse choroidal hemangioma in sturge-weber syndrome

Purpose. To report the treatment outcome of photodynamic therapy with verteporfin (PDT) for exudative retinal detachment (RD) associated with diffuse choroidal hemangioma in Sturge-Weber syndrome (SWS). Methods. An interventional case report of a 10-year-old girl with SWS who developed an exudative RD (visual acuity hand motions) that was treated with PDT. She was treated with a first session of multispot PDT. Posteriorly, a choroidotomy for drainage of subretinal fluid was created, combined with an intravitreal injection of gas (SF6) and cryoapplication. Finally, a second session of PDT was applied. Results. Subretinal fluid resolved over a period of one year and visual acuity increased to 20/125. Conclusions. PDT is an effective therapeutic option for exudative RD associated with diffuse choroidal hemangioma

A bending cell for small batches

This article presents the study that is done for the conception of an automated bending cell devoted to the processing of parts in small batches, gathering the real necessities of potential customers. Joining the maximum of possible information, on the present cells, is has been able to conceive an automated bending cell devoted to the bending of parts, with dif-ferent form, weight, thickness, etc., in small batches. To be able to reach the proposed objec-tives, the cell is equipped with auxiliary systems, such as ATC (Automatic Tool Change) allied to a tool warehouse, AGC (Automatic Gripper Change) with three different grippers, a repo-sition station, and a dedicated 7th axis in the press brake designed to dock a standard 6 axes robot, that provide to cell a sufficient grade of autonomy. Allied with the idea of creating a cell for small batches, is introduced the target of getting this cell at lower price as possible. Thus the cell acquires an extended application range very important for potential customers. To get real perception of the money saving when working with this automated bending cell comparisons between Man work times vs. machine work times in production of small batches have been made

Structural dynamic updating using a global optimization methodology

In this article, we present the application of a global optimization technique, in particular the GlobalSearch command from MatLab®, in the updating of structural dynamic models. For comparative purposes, we evaluate the efficiency of the global method relatively to the local search method previously used in the Finite Element Model Updating program. The Finite Element Model Updating programs are designed with the primary purpose of validating and optimizing structural numerical models. The first step for structural optimization process is to idealize the desired behavior of the dynamic model to develop, or collect experimental data of a physical model considered as the reference model. The process begins with the construction, on a finite element program, of a numerical model with initial physical parameters, preferably close to the reference model parameters. The numerical model is then submitted, through a Finite Element Model Updating program, to a successive parametric updating until improving its dynamic behavior described by their natural frequencies, mode shapes and damping properties, be similar to the dynamic behavior of the reference model. The Sequential Quadratic Programming algorithm was already used in the optimization of the Finite Element Model Updating program, and the obtained solutions showed that it can’t achieve the global optimal value of the objective function. This kind of methods, used for nonlinear constrained optimization problems, have, generally, difficulties to achieve the global optimum, since they are local optimization methods.Centre for Mechanical and Materials Technologies (CT2M) and Algoritmi R&D Centreinfo:eu-repo/semantics/publishedVersio