[en] the document is a collection of papers on different aspects of materials science.An initiative was taken to exchange ideas between colleagues from different countries. The conference on materials science takes place every year in Beirut and has multiple themes to discuss such as semiconductors, surface properties and interfaces, construction and civil engineering, metallic materials, polymers and composites etc.

[en] Full text.The electronic structures, the charge-density distribution and the density of states of LiF and NaF semiconductors are studied by the full potential linear augmented plane wave (FLAPW) method within The local spin density approximation (LSDA) and concord well with other calculations and experimental data. The linear optical properties of these compounds are also calculated and compared with the available measurements. In particular, the calculated dielectric functions are in good agreement with the reflectance data

[en] Full text.Glass formation and treatment is highly governed by the way stresses are distributed inside the glass structure or on the surface. Since safety considerations are a must in glass formation and since handling commercial glass is extensive, it is necessary for glass providers to ensure certain balances of internal forces upon heat treatment processes. Examples abound in the commercial arena and windows, doors and architecture glass are some examples to look for. The purpose of this paper is to shed light on stress calculations using mathematical models as well as introducing the reader to other forms of mathematical manipulations used by researchers abroad

[en] Full text.The s-d exchange interactions in dilute Cu-Mn is studied on concentrations varying between 10.5 and 2081.0 ppm of Mn in Co within the (0.03-4.2 degree K) temperature range. Using electrical resistivity data on these alloys, the s-d exchange integral (J), which is negative, was calculated by advanced spss software to show a clear dependence on (Ln c), confirming thus the dominance of Kondo effect below 1000 ppm impurity concentration above this concentration, we have expected an intertwining of Kondo and Spin-Glass regimes

[en] Full text.The present work concerns the rheological properties of binary blends obtained from wastes of PEhd and PS at the molton state. Data obtained in capillary rheometer are presented to describe the effects of blending ratio, shear stress and shear rate on the flow properties, melt viscosity and melt elasticity. For the blend composition corresponding to 20-40% PEhd content, the binary blends show a maximum in the value of melt viscosity accompanied by a minimum in melt elasticity. the variation of melt flow index as function of the composition of the blends indicate two deviations compared to the curve of ideal blend

[en] Full text.A brief review is presented for the recent development of the theory of the particle transition matrix elements, basic to the cross section for Helium and inert particle scattering at thermal energies in solid surfaces. the Jackson and Mott matrix elements are presented and discussed for surface scattering processes, habitually classified as elastic and inelastic. Modified transition matrix elements, introduced originally to account for the cut-off effects, are presented in a direct and simple manner. the Debye-Waller factor is introduced and discussed. A recent calculation for the particle transition matrix elements is presented for the specular and inelastic transition matrix elements and the corresponding inelastic scattering cross section is compared in detail to experimental data. the specular and inelastic transition matrix elements are found to be intrinsically similar owing to the intermediate role of a proposed virtual particle squeezed state near the surface

[en] Full text.Using the self-consistent full potential linear-augmented plane-wave method (FLAPW) within the local spin density approximation (LSDA), the structural and electronic properties of SnO are investigated. Effectively, it is shown that the calculated equilibrium volume and the bulk modulus are in good agreement with experimental data and other calculations. The results on band structure, charge density and density of states are also presented and compared with other calculations. The good agreement is found

[en] Full text.The spin glass of: (Cu-Mn, Ag-Mn, Au-Mn, Au-Fe) alloys has been extensively studied. The availability of published and assured experimental data on the susceptibility x(T) of this alloys has enabled the design and application of phenomenological approach to the spin glass state of these interesting alloys. The use of and advanced (S.P.S.S) computer software has resulted revealing some important features of the spin glass in these alloys, the most important of which is that the spin glass state do not represent as phase change

[en] Full text.The mechanical stresses, inducing stored energy within the deformed structure of the crystalline materials, has an important role in the physical properties of these materials. Therefore determination of stored energy is very important, specially for the study of mechanical behaviours of materials. From among several conventional means, the calorimetry method provides a relatively simple and trustful means for measurement of stored energy in the metals. In this work evaluation of stored energy relevant to the residual stresses in the defected and annealed samples of Aluminium metal was carried out using a differential scanning calorimeter, DSC. Comparing the results of defected and annealed samples, gives ∼0.6 cal/gr as an excess stored energy for the defected samples. the results were also compared with the figures obtained through XRD method for the same samples, in which the amount of lattice parameter changes due to the mechanical stresses, have been determined by means of evaluation of the displacement and broadening of the X-ray diffractogram peaks. This will then allow us to calculate the amount of extra energy in the defected samples. Satisfactory comparison between the DSC an dXRD results confirms the reliability of the DSC method for this sort of studies

[en] Full text.As we have published earlier, there is a considerable penetration of copper into the CdS in both the grain and the grain boundary regions. It is of technical as well as general scientific interest to study this diffusion process and also to estimate the values of the diffusion coefficient of copper in these two regions during post-annealing treatment under three different ambient atmospheres (air, vacuum and hydrogen). The diffusion of copper has been studied by Auger electron spectroscopy. The results show that at the temperatures frequently used in post-annealing treatment, hydrogen annealing provides a significantly lower ratio of grain boundary diffusion coefficient D_gb to grain diffusion coefficient D_g than the other two cases