Arquitectura domèstica al Bronze Final i Primera Edat del Ferro a Catalunya: habitacions construïdes amb materials duradors: estat de la qüestió

El present treball es proposa l'estudi fonnal de I'habitat construtt amb materials duradors a Catalunya durant el Bronze Final i la Primera Edat del Ferro, i se centra en l'aninisi dels materials i tecniques de construcció emprats, així com en l' estructura de la casa (planta, dimensions, superfície). Els elements definidors d'aquests habitacles en els períodes estudiats consisteixen en l'ús sistematic de la pedra i la terra com a materials de construcció i la disposició d'habitacions de planta rectangular compartint parets mitgeres, amb poca compartimentació interna i pocs agenc¡:aments al seu interior (llar, forn, banquetes). Les dimensions maximes d'aquestes habitacions no superen, per nonna general, els 20 metres quadrats. La unifonnitat d'aquestes construccions, unida a la poca compartimentació de l'espai, suggereix que ens trobem davant una arquitectura poc especialitzada, que podria correspondre a una societat amb una organització socio-política poc complexa.

Estudi dels materials dipositats en el Museu d"Arqueologia de Catalunya del jaciment ibèric del Castellot de la Roca Roja (Benifallet, Baix Ebre)

El jaciment del Castellot de la Roca Roja (Benifallet, Baix Ebre) es localitza a la riba esquerra del riu Ebre, sobre una formac ió rocallosa de relleus molt abruptes, només accessible per I' extrem septentrional, on es va construir un fossat i una muralla de doble parament que s'adossa a una torre quadranguiar. Sens dubte, la se va posició és immillorable per tal d'exercir el control del pas pel riu.

Les pintures murals de la basílica de "Es Cap des Port" (Fornells, Menorca): materials i tècniques

El present treball ofereix una revisió de les pintures murals de la basílica de «Es Cap des Port» (Fornells, Menorca), així com un estudi de caracterització arqueometrica deIs materials i tecniques per microscopia optica, tant amb lupa binocular com amb micro scopi petrografic mitjanliant ¡¡lmina prima, difracció de raigs X i microscopia electronica de rastreig. Els resultats han permes identificar els pigments emprats, així com la seva tecnica d'aplicació. Igua!ment, han permes caracteritzar els morters i han desvelat l' existencia de dos tipus diferents de suporto Malgrat aquestes diferencies en els morters, els pigments són sempre els mateixos per a tots els conjunts pictorics caracteritzats.

CLIL Materials in Chemistry and English: Iodometric Titrations

Content and Language Integrated Learning (CLIL)Materials in Chemistry and English following the principles of CLIL / Content-based Instruction and Task-based Learning

La pintura mural romànica: estudi de la tècnica i anàlisi dels materials

Els objectius de partida d’aquesta recerca han estat l’estudi de les tècniques i dels materials dela pintura mural medieval a Catalunya, tot i establint paraŀlelismes amb el coneixement que ensaporten els tractats tècnics d’època medieval. S’ha revisat també l’estat actual del coneixement sobre les tècniques d’alguns conjunts de pintura mural aragonesos i d’àmbit europeu.

Histopathological evaluation of root canal filling materials for primary teeth

This study aimed to assess the response of apical and periapical tissues of dogs¿ teeth after root canal filling with different materials. Forty roots from dogs¿ premolars were prepared biomechanically and assigned to 4 groups filled with: Group I: commercial calcium hydroxide and polyethylene glycol-based paste (Calen®) thickened with zinc oxide; Group II: paste composed of iodoform, Rifocort® and camphorated amonochlorophenol; Group III: zinc oxide-eugenol cement; Group IV: sterile saline. After 30 days, the samples were subjected to histological processing. The histopathological findings revealed that in Groups I and IV the apical and periapical regions exhibited normal appearance, with large number of fibers and cells and no resorption of mineralized tissues. In Group II, mild inflammatory infiltrate and mild edema were observed, with discrete fibrogenesis and bone resorption. Group III showed altered periapical region and thickened periodontal ligament with presence of inflammatory cells and edema. It may be concluded that the Calen paste thickened with zinc oxide yielded the best tissue response, being the most indicated material for root canal filling of primary teeth with pulp vitality.

Advanced optical microscopies for materials: new trends

This article summarizes the new trends of Optical Microscopy applied to Materials, with examples of applications that illustrate the capabilities of thetechnique.

Handbook of instrumental techniques for materials, chemical and biosciences research

This Handbook contains a collection of articles describing instrumental techniques used for Materials, Chemical and Biosciences research that are available at the Scientific and Technological Centers of theUniversity of Barcelona (CCiTUB). The CCiTUB are a group of facilities of the UB that provide both the research community and industry with ready access to a wide range of major instrumentation.Together with the latest equipment and technology, the CCiTUB provide expertise in addressing the methodological research needs of the user community and they also collaborate in R+D+i Projectswith industry. CCiTUB specialists include technical and Ph.D.-level professional staff members who are actively engaged in methodological research. Detailed information on the centers’ resources andactivities can be found at the CCiTUB website www.ccit.ub.edu ...

Materials ecobioconstructius sostenibles

Sobre materials ecobioconstructius sostenibles

Role of structural saturation and geometry in the luminescence of silicon-based nanostructured materials

The structural saturation and stability, the energy gap, and the density of states of a series of small, silicon-based clusters have been studied by means of the PM3 and some ab initio (HF/6-31G* and 6-311++G**, CIS/6-31G* and MP2/6-31G*) calculations. It is shown that in order to maintain a stable nanometric and tetrahedral silicon crystallite and remove the gap states, the saturation atom or species such as H, F, Cl, OH, O, or N is necessary, and that both the cluster size and the surface species affect the energetic distribution of the density of states. This research suggests that the visible luminescence in the silicon-based nanostructured material essentially arises from the nanometric and crystalline silicon domains but is affected and protected by the surface species, and we have thus linked most of the proposed mechanisms of luminescence for the porous silicon, e.g., the quantum confinement effect due to the cluster size and the effect of Si-based surface complexes.

Experimental investigation of the initial regime in fingering electrodeposition: Dispersion relation and velocity measurements.

Recently a fingering morphology, resembling the hydrodynamic Saffman-Taylor instability, was identified in the quasi-two-dimensional electrodeposition of copper. We present here measurements of the dispersion relation of the growing front. The instability is accompanied by gravity-driven convection rolls at the electrodes, which are examined using particle image velocimetry. While at the anode the theory presented by Chazalviel et al. [J. Electroanal. Chem. 407, 61 (1996)] describes the convection roll, the flow field at the cathode is more complicated because of the growing deposit. In particular, the analysis of the orientation of the velocity vectors reveals some lag of the development of the convection roll compared to the finger envelope.

Materials and supplementary materials used to teach vocabulary in the English class

This study is based on the analysis of the use of supplementary materials to teach vocabulary by second language teachers in Primary Education. The study consists of two analyses: the first one is a quantitative analysis based on 33 questionnaires answered by different second language teachers of Primary Education. The other, is a qualitative analysis in which the teacher’s subjective opinion on vocabulary learning techniques is presented. The study covers these main aspects: material use, effectiveness, children’s motivation, main criteria to teach vocabulary and the children’s role in their vocabulary learning.

Quasi-Nonparametric Blind Inversion of Wiener Systems

An e cient procedure for the blind inversion of a nonlinear Wiener system is proposed. We proved that the problem can be expressed as a problem of blind source separation in nonlinear mixtures, for which a solution has been recently proposed. Based on a quasi-nonparametric relative gradient descent, the proposed algorithm can perform e ciently even in the presence of hard distortions.

Els nous materials s'inspiren en taurons i flors

Els nous materials sintètics, els més revolucionaris, s"inspiraran en la natura, capaç de crear per ella mateixa estructures amb propietats úniques