Abstract： The dependences of the light absorption coefficient in the film structures Bi₂Tе_2.5Se_0.5 on the photon energy have been experimentally studied. It is shown that the profiles of the distribution of selenium atoms over the thickness of the surface layer of unannealed and depleted thin Bi₂Tе_2.5Se_0.5 films. It is also shown that the release of selenium during heat treatment is due to the relatively high vapor pressure of selenium in a three-component semiconductor compound. As a result of work are received Si -Bi₂Те_3-хSe_х heterojunctions in thin-film execution, described by high values of differential resistance. Results of researches show, that the structures Bi₂Tе_2.5Se_0.5 received by a method of discrete thermal evaporation in a uniform work cycle, are suitable for use in low-voltage devices.

Abstract： The resilient behavior of asphalt stabilized soil under repeated loading in terms of the change in the potential of deformation and shear failure was investigated in this work. Asphalt stabilized soil specimens of 100mm diameter and 70mm height and 152mm diameter with 127mm height have been prepared in the laboratory and compacted to a target density at optimum asphalt requirement and at 0.5％ of asphalt above and below the optimum. Specimens were tested for deformation and resilient modulus under repeated shear stress. The deformation of the specimens has been captured along the load repetition process with the aid of linear variable differential transformer (LVDT) under controlled stress and environmental conditions in the pneumatic repeated load system (PRLS) until failure. For large size specimens tested under single punch shear stress, the resilient deformation decreases by (70, 51, and 47) ％ as compared with pure soil at fluid content equals to (15.5, 16, and 16.5) ％ respectively after 1200 load repetitions. For small size specimens tested under double punching shear test after thirty and eight days curing, the resilient modulus increased by (442, 362, and 216) ％ for fluid content equals to (15.5, 16, and 16.5) ％ respectively after load repetitions equal to 1200. Data of the two testing techniques regarding resilient deformation rate under single and double punching shear stress was analyzed and compared. It was concluded that eight days curing and double punch shear testing are reported as the optimum time and test technique for enhancing proper resilient modulus. Asphalt stabilization exhibit positive impact on resilient modulus, it increases Mr by a range of (600, 700, and 100) ％ for double punch at 30 and 8 days curing and single punch at 8 days curing after the addition of cutback asphalt as compared with natural soil.

Abstract： The present paper reports the preparation and characterization of tetra-n-butylammonium bromide modified local clay material (TBAB-Clay) and its application as potential adsorbent material for Crystal Violet dye removal from aqueous solution. Major mineral phases, identified by X-ray powder diffraction (XRD), were illite and kaolinite, in addition to quartz and calcite as impurities. Characterization of the material was supplemented by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The kinetics of the adsorption process was studied using two models: pseudo-first-order and pseudo-second-order. Experimental data were best fitted with pseudo-second-order model. Three isotherm models namely Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) were used to describe the adsorption process. The inclusion of non-linear regression analysis suggested the Langmuir model best described the adsorption process. The Langmuir isotherm predicted the maximum monolayer adsorption capacity of 115.54 mg g-1 while the D-R isotherm suggested a physisorption process with a free energy value of 0.708 kJ mol-1. Based on the obtained results it can be concluded that this modified clay material is a promising adsorbent for the removal of Crystal Violet dye from aqueous solution.

Abstract： The electrodeposition of Manganese doped Cadmuim Oxide (CdMnO2) thin films on conducting Indium Tin Oxide (ITO) glass was done successfully at room temperature of 302 K at varying time of deposition. The grown films were subjected to optical, crystal structure surface structural and compositional characterization to determine their properties and possible applications. The results revealed that absorbances of the films were high in VIS region but decreases towards the NIR region. Transmittance of the films is low in VIS region but increases towards the NIR region. The deposited films have optical band gap energies range from 2.80 eV to 3.85 eV. The deposited films have low reflectance and refractive index obtained ranged from 2.64 to 1.01. Average optical thickness of the deposited films revealed that the films have optical depth between 1.35 µm and 0.05 µm. X – ray diffraction result of the films obtained confirm that the films are of CdO with cubic crystal structure. Crystallite sizes of the films deposited range from 28.54 nm to 97.05 nm. The average microscopic particle sizes of the films were analyzed using ImageJ and values obtained range between 2.98 nm and 33.81 nm. Thickness of the films obtained in atom / cm2 ranges from 2,02 x 1018 atom/cm2 to 3.22 x 1018 atom/cm2.