1,474 research outputs found
Sir Themistocles Zammit : his honours and an annotated bibliography of his medical work
No full textSir Themistocles Zammit was born 30th September 1864 and died 2nd November 1935. Dr. Paul Cassar wrote that Zammit “is, in my view, Malta’s most distinguished man”. He was scientist, doctor, chemist, archaeologist, writer and statesman, yet there has been no proper biography of him and no complete list of his publications and only few of his personal papers survive. It is difficult to trace his career and there seem to be few reminiscences about him. In this article the author compiles an annotated bibliography of the medical papers of Sir. T. Zammit.peer-reviewe
Sir Temi Zammit
No full textDan l-editorjal jesprimi s-sogħba għat-telfa ta’ Sir Temi Zammit, membru li ta kontribut qawwi anke fil-letteratura speċjalment fil-Għaqda tal-Kittieba tal-Malti.N/
Des épidémies dans la préhistoire. Au sujet de l'article de O'Brien S. et. Dean M. Pourquoi certaines personnes résistent au SIDA, Pour la Science
No full textZammit Jean. Des épidémies dans la préhistoire. Au sujet de l'article de O'Brien S. et. Dean M. Pourquoi certaines personnes résistent au SIDA, Pour la Science. In: Bulletin de la Société préhistorique française, tome 95, n°2, 1998. p. 282
Cooperative ways of working: towards a Mediterranean research project
No full textedited by Godfrey Baldacchino. Saviour Rizzo, Edward L. Zammit.; Includes bibliographical references.Source type: Print(0
A Book Review of A Friend In Hope: a Story About Hope's Journey with a Brain Tumour by M. Zammit & E. Dornbusch
No full textThis is a book review of a storybook written originally in English by Marisa Zammit and illustrated by Erica Dornbusch under the title A Friend In Hope: a Story About Hope's Journey with a Brain Tumour. The author also reviews the French translation Mon amie Claire: L'histoire de Claire et de sa tumeur cérébrale and the Italian version La mia amica Speranza: Speranza e il suo tumore cerebrale
Simultaneous specific heat, thermal conductivity and imaging evaluations in thin samples of 8CB liquid crystal dispersed with microemulsion of DDAB/water micelles
No full textIn this work we use a photopyroelectric calorimetric set up to analyze the transformations occurring in thin samples of liquid crystal-microemulsion system by combining the results of the simultaneously performed high temperature resolution polarization microscopy observations and the temperature dependence of the specific heat, and of the thermal conductivity. This enabled an accurate direct correlation of the observations concerning the different measured quantities for a most comprehensive interpretation of the obtained results. It is found that the I-N conversion progresses in the entire nematic range because of the micelles expelled from the nucleating nematic volumes remaining confined in the residual isotropic material. A hysteretic behavior is observed in the nematic range between cooling and heating run because of the different micelle content in the material during the cooling and heating runs. A moderate hysteresys also over the N-A transition indicated an additional material refinement from micelles during the transition. Finally in samples with different micelle concentration the same maximum micelle content is retained in the nematic and smectic phases
Photopyroelectric Calorimetry Investigations of 8CB Liquid Crystal–Microemulsion System
No full textIn this work, the photopyroelectric technique has been used to investigate the phase transitions in a liquid crystal microemulsion by combining the simultaneous high temperature resolution thermal diffusivity measurements and optical polarization microscopy observations. It has been found that, during the conversion from the isotropic phase into the nematic one, the micelles are expelled from the nematic domains and remain confined in islands of isotropic material which survive down to the smectic temperature range. A hysteresis in the thermal diffusivity profiles between heating and cooling run over the isotropic-nematic transition temperature range has been observed which has been ascribed to the different micelles distribution into the sample volume during cooling and heating runs. Finally, the almost bulk-like behavior of the thermal diffusivity over the nematic-smectic phase transition confirms that a significant fraction of the micelles are expelled during the nucleation of the nematic phase
Communication: Optically induced decoupling of the smectic-A and nematic order parameters at the AN phase transition in phototropic liquid crystals
No full textIn the present work, by means of the photopyroelectric calorimetric investigations in liquid crystal/naphtopyran (NP) molecule mixtures, the effect of the photoisomerization of NP by UV light on the critical behavior of specific heat could be studied over the smectic-nematic phase transition. It is shown that the UV light irradiation of the sample can shift the critical exponent from a non-universal value typical of the non-irradiated mixture to one close to that of the 3D-XY universality class, predicted for such a transition. This witnesses the optically triggered reduction of the coupling between the smectic and nematic order parameters responsible for the deviation from the XY-like behavior. A tentative explanation is provided based on the weakening of the order parameter coupling caused by the NP molecules entering the smectic layers following the UV light illumination
Analysis of UV Assisted Phase Transitions in Mixtures of Liquid Crystals with Photochromic Compounds by Photopyroelectric Calorimetry
No full textIn this work, an upgraded photopyroelectric setup has been used to investigate phase transitions in liquid crystals dispersed with photochromic molecules. In particular, we have studied the thermal diffusivity before, during, and after the photo-induced conformational changes of the dispersed photochromic molecules. Upon sample irradiation, an opposite shift of the phase transition temperatures were observed in the investigated 8CB–NP and 8CB–7AB mixtures due to the different changes in the shape undergone by the dispersed active molecules
Thermophysical Parameters Evaluation by Pyroelectric Detection
No full textThe different configurations of the photopyroelectric calorimetry which can be adopted for the evaluations of the thermophysical parameters in liquids and in solids, and the advantages, with respect to other calorimetric techniques, are briefly described. A review of the recent results obtained by the photopyroelectric back-detection configuration for the determination of the different thermophysical properties in various materials is presented with particular attention to the cases where the temperature dependence of such parameters is studied. The results concerning the studies carried out by performing simultaneous calorimetric and imaging evaluations are also described. Finally, the possibility of performing “absolute” measurements of the thermal parameters, eliminating the influence of eventual coupling fluid, is discussed
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