Materials and Biomaterials Science 2019-08-24T14:50:46+02:00 A. Henni Open Journal Systems <p><strong>Journal Overview</strong></p> <p>Materials and Biomaterials Science provides a unique forum for the discussion of novel processing, applications and theoretical studies of functional materials and biomaterials for (opto)electronics, sensors, detectors, biotechnology and green energy.&nbsp;This journal encompasses insights into the chemistry, biology and materials science underpinning (bio) materials research, new concepts in biomaterials design, and using materials to answer fundamental questions.</p> <p><span lang="EN-GB"><strong>ISSN:&nbsp;</strong>2661-7226</span></p> <p><span lang="EN-GB"><strong>Abbreviation:</strong>&nbsp;Mater. Biomater. Sci.</span></p> Optical properties of TiO2 electrodes sensitized by Red Cabbage dye for application in Dye-Sensitized Solar Cells 2019-08-24T14:50:46+02:00 Chamsse Eeddine Derdakh Salah Eddine Zerrouki Abdellah Henni <p>The dye-sensitized solar cell (DSSC) is a third-generation photovoltaic device that holds great promise for the economic conversion of solar energy into electrical energy. TiO<sub>2 </sub>layers have been deposited by the spin-coating technique based on excess of a TiO<sub>2</sub> solution on glass substrates heated to a fixed temperature of 80°C. The objective of the present study is the study of the influence of dye on the optical properties of these layers. For this, we used UV-Visible spectroscopy for optical characterizations. UV-Visible transmission spectra confirm that it is possible to obtain good transparent TiO<sub>2</sub> films with a 68 to 87 % transmittance in the visible region.</p> <p><strong>Keywords:</strong> Dye-sensitized solar cell, thin layers, TiO2, Red cabbage dye, optical properties.</p> <p><strong>Downloads :</strong></p> 2019-08-17T00:00:00+02:00 ##submission.copyrightStatement## Effect of the combined efforts on stresses distribution in the dental prosthesis 2019-02-09T11:26:17+01:00 Djebbar Noureddine Ali Benouis Mohammed Elnedhir Belgherras Benali Boutabout <p class="Titreniveau1"><span lang="EN-GB">This study focused one the numerical analysis by the finite element method the distribution of the equivalent stresses and its level in the three elements of the dental prosthesis (abutment, implant and bone) subjected to combined efforts simulating the operation of the tooth. This distribution was made in the three zones (distal, median and proximal) of these components. </span></p> <p><strong>Keywords : </strong>Dentalimplant; Bone; Stresses; Interface; Combined effort; Finite element method.</p> <p><strong>Downloads :</strong></p> 2019-02-09T11:25:14+01:00 ##submission.copyrightStatement## Defluoridation of groundwater in the south east of Algeria by adsorption 2019-02-02T18:11:22+01:00 Noura Chaouch Abderrahim Khelfaoui <p>Because of its high reactivity, fluorine does not occur in the elemental state in nature but rather in the form of salts that are grouped under the generic term of Fluoride. Fluorine is one of the natural constituents present in the groundwater of the South-East of Algeria. However, these waters contain high levels of fluoride in excess of the standard recommended by WHO, which is in the range of 1.5 mg / l for water intended for human consumption. These high concentrations can lead to damaging physical effects, especially dental fluorosis and skeletal fluorosis, as well as hypersensitivity reactions and kidney disease. The treatment of these fluorinated waters is, therefore, indispensable, which has prompted us to develop this research in order to be able to propose an adsorbent able to normalize the quantity of fluoride in the groundwater of South-East Algeria, especially the waters destined to human consumption.</p> <p><strong>Ke</strong><strong>ywords</strong>: Ouargla; El Oued; Biskra; Ghardaia; Groundwater; Fluorine; Adsorption.</p> <p><strong>Downloads :</strong></p> 2019-02-02T00:00:00+01:00 ##submission.copyrightStatement## Analysis of the biomechanical behavior of orthopedic cement: effect of crack morphology 2019-01-16T19:05:54+01:00 Mohammed Elnedhir Belgherras Boualem Serier Lalia Hachemi <p>In orthopedic surgery and more particularly in total hip arthroplasty, the fixation of the implants is generally done by means of a surgical cement consisting essentially of polymer (PMMA), It is necessary to know the forces applied to the right of the prosthetic articulation during routine activities performed by the patient in their daily life in order to establish the distribution of the stresses in the system (bone - cement - implant).&nbsp;Damage accumulation and failure in polymethylmethacrylate (PMMA) cement are the most important in total &nbsp;hip cemented leading to eventual loosening of the implant. In this study, we used the three-dimensional finite element) method (FEM)to analyze and calculate the three modes (I, II and III) of stress intensity factor (SIF) of form Plane inside the cement mantle for different sizes and depending on the different activities of the patient. The comparison was made between 2 types of elliptical and rectilinear crack, applying the same boundary conditions. From the results obtained, we show that the crack mode of The opening is proportional to the stress applied to the damaged part (compression or traction) The FIC values are less important for the elliptic crack than the rectilinear crack, which reaches the threshold of rupture under certain conditions, and is propagated essentially by shearing of the two crack lips in mixed modes II and III, these values show that the most probable mode of rupture is mode II.</p> <p><strong>Keywords: &nbsp;</strong>Rectilinear crack; Bone cement; PTH; Stress intensity factor.</p> <p><strong>Downloads :</strong></p> 2019-01-16T19:04:15+01:00 ##submission.copyrightStatement## Detection of toxic heavy metals in the water of Chott Ain el Beida (bowl of 0uargla, South-east of Algeria) 2019-01-10T19:39:56+01:00 Noura Chaouch Samir Birech Ismail Messaoudi <p>The bowl of Ouargla has several wetlands of international importance including the chott of Ain El Beida. The site is characterized by an important fauna and flora whose protection constitutes currently a major national concern. The chott has served as an outlet for all wastewater and drainage water from the bowl in order to avoiding its engorgement. This site is at this time seat of a metal pollution. The detection of heavy metals will undoubtedly have adverse consequences on the ecological characteristics of the site.</p> <p><strong>Keywords: &nbsp;</strong>Ouargla, Wetland, Chott of Ain El Beida, pollution, metals, heavy metals.</p> <p><strong>Downloads :</strong></p> 2019-01-10T00:00:00+01:00 ##submission.copyrightStatement## The hydrodynamic analysis of the two-phase flow in the bubble column 2019-01-07T16:45:18+01:00 Ammar Zeghloul Abdelwahid Azzi Hiba Bouyahiaoui Nabil Ghendour Faiza Saidj <p><span lang="EN-US">Bubble columns are widely used as gas/liquid contactor. Their Applications affect the chemical, petrochemical and organic industry. They provide several advantages during operation and maintenance such as high heat and mass transfer rates, compactness and low operating and maintenance costs. In this work, an experimental study was carried out in a bubble column with an internal diameter of 144mm for an air-water two-phase combination. In order to study the two-phase pressure drop in the bubble column three absolute pressure transdicers were used for different gas superficial velocities. </span><span lang="EN-US">Tests were run with the gas superficial velocities ranged from 0.022 to 3.5 m/s. </span><span lang="EN-US">The pressure drop analysis was conducted. It showed that for the two-phase flow the pressure drop depends on the flow configuration. The two-phase pressure drop measurement technique was used to calculate the void fraction. Examination of the pressure signal time series as well as the visual analysis made it possible to identify the different flow configurations obtained. Spectral Power Density (PSD) has been applied to pressure signal time series to quantify the frequency of two-phase structure. The latter showed persistence of frequency for most of the conditions except that at low gas superficial velocities were a higher frequency are observed.</span></p> <p><strong>Keywords:&nbsp;</strong><span lang="EN-US">Two-phase flow, Bubble column, void fraction, two-phase pressure drop.</span></p> <p><strong>Downloads :</strong></p> <p>&nbsp;</p> 2019-01-07T16:41:55+01:00 ##submission.copyrightStatement##