science
SERIA B
Chimie și Știința Materialelor
Excelență în Cercetare
Din 1929
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Comparative interpretation of the effect of surfactants on grinding blended Portland cement with high proportions of granulated blast furnace slag
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Ion Teoreanu, Adriana Moanþã
The paper brings information on grinding cement with high proportions of\r\nblast furnace slag in the presence of surfactants employed as grinding aids. The\r\nsurfactants which are organic compounds belonging to the ethanol amine group\r\ndiffer by the chain length. The paper presents the...
Electrochemical studies on 1-azophenylazulene
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Eleonora-Mihaela Ungureanu, Alexandru C. Rãzuº, Liviu Bîrzan, Mariana-ªtefania Creþu, Elena Diana Giol
The electrochemical study of 1-azophenylazulene (A) in acetonitrile solutions\r\nwas performed by cyclic voltammetry (CV), differential pulse voltammetry and\r\nrotating disk electrode. The poly(A) film formation was studied. The poly(A)\r\nmodified electrodes were characterised by CV in...
Synthesis and structure of 2-ethyl-2-oxazoline macromonomers with styryl endgroups
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Valentin Victor Jerca, Florica Adriana Nicolescu, Dan Sorin Vasilescu, Ana Maria Albu, Dumitru Mircea Vuluga
Synthesis of poly(2-ethyl-2-oxazoline) macromonomer having a styryl group\r\nas polymerizable function has been performed in bulk as well as in solution by\r\n\\\"initiator method\\\" using p-chloromethyl-styrene. The molar ratio between styryl and\r\noxazolinic groups is different depending on...
A study of L-lactide ring-opening polymerization in molten state
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Ionuþ Banu, Nicoleta Doriana Stanciu, Jean-Pierre Puaux, Grigore Bozga
The L-lactide bulk polymerization process was investigated in a batch\r\nHAAKE Rheocord mixer using stannous octoate as initiator at two molar monomer\r\nto initiator ratios and a temperature of 185 °C. The ring-opening of L-lactide was\r\nconfirmed by FT-IR, the monomer conversions were...
Synthesis, characterisation and biological activity of some Cr(III), Fe(III), Cu(II),Mn(II)-complexes of N,O-aminoethanol tetrachlorocyclotriphosphaze
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Denisa Mânzu, Ticuþa Negreanu-Pîrjol, Florina Dumitru, Mihaela Alexie, Cornelia Guran
Metal complexes of N,O-aminoethanol tetrachlorocyclotriphosphazene\r\ncontaining transition metal cations such as Cr(III), Fe(III), Cu(II) and Mn(II) have\r\nbeen prepared and characterised by standard physico-chemical procedures\r\n(elemental chemical analysis, IR, UV-VIS and EPR spectra,...
Testing of organic inhibitors for the protection of some titanium alloys in aggressive media
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Laurenþiu Popa, Maria Rãdulescu, Iosif Prodea, Viorel Brânzoi
The corrosion failures of titanium alloys are inevitably associated with the\r\nnon-observance of environmental limits prescribed in corrosion handbooks, e.g., its\r\nuse in solutions containing chloride salts. When in a corrosive substances flux some\r\noxidant species are present, it is...
Fractal analysis and characterization of human skin images in cosmetology
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Mihai Ivanovici, Noël Richard, Hana Decean
Fractal-based approaches have been widely used for the characterization of\r\nthe images with self-similar content, such as textures. Human skin has a particular\r\ntexture, given the pores, hair, visible blood vessels and skin affection manifestations,\r\nintimately entangled into a unique...
Effect of an oxide layer on the tensile behavior of pure nickel foils
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Bernard Viguier, Simon Pérusin, Eric Andrieu
We present in this paper the consequences of an oxide scale grown on pure\r\nnickel on the mechanical behaviour. The presence of the oxide layer hardens the\r\nmetal for low strain level, and reduces the ductility. Activation volumes as measured\r\nduring stress relaxation experiments show that...
Influence of heat treatment on magnesium alloys meant to automotive industry
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Gabriela Popescu, P. Moldovan, D. Bojin, W. H. Sillekens
The paper presents a study concerning the heat treatment realized on\r\nmagnesium alloys, from AZ80 and ZK60 class. These alloys are destined to replace\r\nthe conventional ferrous and aluminum alloys in automotive industry. It was\r\nrealized the heat treatment, T5 – artificially aging,...
Microstructural characterization of AA - 7175 alloy slabs
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Nicole Panait, Mariana Ciurdas, Robert Stephan
The microstructural characterization (SEM,EDS) of the AA 7175 aluminum\r\nalloy has indicated the presence of different phases formed during the primary\r\nprocessing of large ingots (casted in Wagstaff installation) intended for furher\r\nprocessing by forging. Samples prevailed from different...