Chimie și Știința Materialelor
Two types of polymer conditioned fertilizers, with slow release of active compounds, were synthesized and characterized. The products have been obtained in solid form, through a crosslinking impregnation method. The influence of pH and temperature on the activity index was investigated in order to reach an optimization…
picture_as_pdfText integral (PDF)This paper presents the chemical composition determination of collected slag and ash samples obtained from coal burning in thermo power plants.Its purpose is to point out the existence of high mineral compounds content (macro and micro components) in these samples, in order to apply these burning residues in the build…
picture_as_pdfText integral (PDF)Present paper describes briefly the results of the last years research on a new hybrid composite material. Several phases of this material’s development are presented, from conceptual design to tests performed on some composite samples. Named CFRAl (Carbon Fibers Reinforced Aluminum), the new composite has unique and p…
picture_as_pdfText integral (PDF)Tolerance to gastric acidity, bile salts and adhesion of probiotic bacteria to intestinal epithelial cells is regarded as a prerequisite to exert beneficial health effects. Resistance to pH 2–4 and 0,3–1% bile salt concentration of Lactobacillus casei 01, Lactobacillus acidophilus La-5, as well as adhesion of strains t…
picture_as_pdfText integral (PDF)Enhanced green fluorescent protein (EGFP) can emit fluorescent light without the addition of any exogenous substrate. A six histidine coding region was fused to the N -terminal end of the EGFP coding gene, thus the recombined fluorescent protein (His6-EGFP), obtained by heterologous expression in a bacterial system was…
picture_as_pdfText integral (PDF)Le comportement en corrosion de douze alliages pour armature de prothèse fixée a été étudié dans une salive artificielle de pH=2,3. Le potentiel libre ainsi que les résistances de polarisation ont été mesurés sur une durée de deux heures d’immersion. Les potentiels sont en général très élevés (vers +300mV/ENH), tout co…
picture_as_pdfText integral (PDF)The paper presents the experimental results regarding the influence of the electron beam treatment on molecular weight distribution and degradation rate of corn and potato starch. The obtained data showed that the electron beam treatment lead to the formation of fragments with different molecular weights, which modify …
picture_as_pdfText integral (PDF)A potent kinase inhibitor pyrazole derivative, 1,3-di-tert-butyl-N-(4-fluorophenyl)-1,6-dihydroimidazo[4,5-c]pyrazole-5-amine, has been found in Nested Chemical Library (NCLTM) during a high throughput screening (HTS) kinase assay. Since the sample had only 91,3% purity, the biochemical assay was followed by the resynt…
picture_as_pdfText integral (PDF)This paper presents the studies realized for removal of different pollutants (benzene, toluene, xylene, phenol) in the purification process of water by adsorption on various multipurpose carbon materials. The adsorptive properties of multipurpose carbon materials obtained from different vegetal sources were studied by …
picture_as_pdfText integral (PDF)A major peculiarity of Târnava Mare water is its hardness characterised by a large amount of calcium and magnesium ions and by the presence of ammonium and nitrite ions. This paper presents an automatic dosage installation for granular aluminium sulphate and an optimum treatment scheme using coagulation agents (alumini…
picture_as_pdfText integral (PDF)New hybrid materials based on two types of polyhedral oligomeric silsesquioxane used as reinforcing agents and diglycidyl ether of bisphenol A used as polymer matrix were studied. These hybrid materials were characterized using Thermogravimetric Analysis (TGA) and Dynamic Mechanical Analysis (DMA) to identify the influ…
picture_as_pdfText integral (PDF)This paper presents some preliminary experimental results regarding the formation of Ag coatings on Cu substrate using electrochemical and chemical procedures from choline chloride based ionic liquids containing Ag(I) salts. Some aspects regarding synthesis and characterization (color, appearance, electrical conductivi…
picture_as_pdfText integral (PDF)Recent studies have highlighted that the fulfillment of important conditions for PVC use is considered by an optimum ratio between hydrophilic and hydrophobic parts of the polymer surface. The research was conducted with the purpose to increase the hydrophilic part by chemical modifications. PVC-derivatives were obtain…
picture_as_pdfText integral (PDF)Activity and distribution of enzymes in activated sludge flocks reflect microbial activities when degrading organic matters in wastewater. A lab-scale sequencing batch reactor (SBR) was build and used for the treatment of synthetic wastewater to investigate the location and distribution of hydrolytic enzymes, α-glycosi…
picture_as_pdfText integral (PDF)The biologically produced hydrogen is defined as biohydrogen. Biological hydrogen production methods offer distinct advantages, such as operation under mild conditions, high selectivity and the possibility of using renewable sources, but have also some disadvantages, such as low conversion efficiency and high operating…
picture_as_pdfText integral (PDF)We considered the ancestral proteinase IDP-β as a good starter-protein to redesign substrate specificity of serine-proteinases. Therefore it is of major importance to analyse its amino acid sequence and to create a good in silico structural model for this enzyme. As special attention to the cysteine residues present mu…
picture_as_pdfText integral (PDF)Cermet hard metal alloys based on titanium carbide/titanium carbonitride and tungsten carbide are known for large their applicability because of remarkable properties of high wear, oxidation and corrosion resistance.In order to obtain performance compositions with high content of TiCN up to 70%, 20% concentrations of m…
picture_as_pdfText integral (PDF)This work contains data about obtaining silver nanoparticles by a sonochemical method. This method involves using a solution of silver nitrate, AgNO3, which is subject to very intense ultrasound flow leading to the emergence of microscopic bubbles (cavities). These cavities expand during the decompression phase of ultr…
picture_as_pdfText integral (PDF)Bioglass coatings were prepared by RF magnetron sputtering techniques onto titanium substrates from a 45S5 Bioglass® powder target. Two working pressures were used: 0.16 Pa and respectively 0.45 Pa. The structures were investigated from morphological, compositional and structural point of view by FTIR and SEM-EDS. The …
picture_as_pdfText integral (PDF)In the paper the microstructure of 7050 DC cast slabs in Wagstaff installation, in different zones of transverse section of slabs is presented. The morphologies and composition of intergrain and intragrain phases was put in evidence by electron microscopy (SEM,EDS.\r\nIntergrain phases which contains Al, Mg,Cu and Zn a…
picture_as_pdfText integral (PDF)The designed experimental model was intended to analyze the process of modeling the flow of ferrous alloys in order to highlight the correlation between parameters defining the flow equations. The correlation between the experimental model and process parameters was based on temperature sensitivity indicating the evolu…
picture_as_pdfText integral (PDF)The non-uniform material flow is a characteristic feature of the extrusion process. The metal in the peripheral part of the workpiece normally flows much slower than in the central part. This type of flow is strongly influenced by the friction which is presented at the die contact surfaces. In the peripheral part of th…
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