| » A STUDY OF THE EXCIMER NANOSECONDS LASER – TIO2 THIN FILMS INTERACTION |
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| In thermal processing with laser radiation energy deposition and heating in a material are a consequence of the balance between the deposited energy, governed by optical materials properties and characteristics of the laser radiation, and the heat diffusion, determined by thermo-physical materials properties and the interaction time. view more » |
| » ADVANCED MATERIALS BASED ON EPOXY RESINS.4. SYNTHESIS AND CURING REACTION OF A MESOGENIC AZOMETHINE DIEPOXIDE |
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| The diaromatic diepoxide N,N’-bis[4-(2,3-epoxy propoxy) benzylidene]-1,4-phenylene-diamine (AZ-1) has been synthesized and its mesogenic properties have been studied. The curing reaction of the synthesized mesogenic resin, in presence of diaminodiphenylsulfone (DDS), 4,4’-methylene-bis[3-chloro-2,6-diethylaniline) (MCDEA) and 2,7-diaminofluorene (DAF) as curing agents, was studied by differential scanning calorimetry (DSC), optical microscopy (OM) and X-ray diffraction. view more » |
| » ANTIOXIDATIVE ACTIVITY OF SEVERAL DIPHOSPHONATES IN THERMOOXIDATIVE STABILITY OF LDPE |
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| The thermal degradation of low density polyethylene in the presence of several esters – diphosphonates compounds mostly used in anticancer treatment – was investigated by chemiluminescence at three temperatures: 1800C, 1900C and 2000C. view more » |
| » Behaviour of concrete obtained with cement CEM III/A 52.5 R in chemically aggressive mediums |
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| The paper presents the behaviour of concrete made of cement CEM III/A 52.5 R in chemically aggressive mediums (exposure class XA3, as per SR EN 206–1). Assessment of concrete behaviour involved determination of dimensional change (expansion), volume absorption of water, flexural strength, and ultrasound propagation rate on concrete specimens exposed to aggressive mediums as against concrete specimens cured in water. view more » |
| » BLENDS OF LOW DENSITY POLYETHYLENE (LDPE)/POLYETHYLENE TEREPHTHALATE (PET) COMPATIBILISED WITH A TERPOLYMER OF ETHYLNE N-BUTYL ACRYLATE GLYCIDYL METHACRYLATE (EBAGMA) |
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| Morphology and mechanical properties of blends of LDPE and PET: 70/30 wt. % obtained by both virgin polymers and urban plastic wastes have been studied in absence and presence of EBAGMA terpolymer used as compatibiliser. view more » |
| » CHEMICAL BINDING AND STRUCTURE OF CARBONIC THIN FILMS WITH ADVANCED PROPERTIES STUDIED BY ELECTRON SPECTROSCOPY |
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| There is considerable interest in new materials like the hard C-films, with good mechanicalproperties such as hardness, elasticity, low friction coefficient and chemical inertness.The properties of the carbonic thin films strongly depend on their chemical binding and microstructure. view more » |
| » DETERMINATION OF SOME MECHANICAL PROPERTIES OF TINI (50.6 AT. % NI) SHAPE MEMORY ALLOY USING DYNAMIC MECHANICAL ANALYSIS AND TENSILE TESTS |
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| The authors studied some mechanical properties of TiNi (50.6 at. % Ni) shape memory alloy, using dynamic mechanical analysis and tensile tests. The aim of our studies was to point out a correlation between the mechanical behaviour and the martensitic transformation of the alloy during heating/cooling process. view more » |
| » DOUBLE GLASS DRAG SPINING METHOD OF FABRICATION OF THERMOELECTRIC COAXIAL CABLES AND MICROTHERMOCOUPLES |
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| A double softening glass drag spinning method (DSGDSM) with thermal furnace heating was developed for fabrication of long glass coated coaxial microwires on the basis of semiconductor and semimetal. view more » |
| » ELECTRON SPECTROSCOPY STUDIES OF THE DIAMOND LIKE CARBONIC THIN FILMS |
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| Thin films of diamond-like (DLC) and graphitic materials are characterized by low thermal expansion coefficients, high thermal and electrical conductivities and chemical inertness. DLC, in addition, exhibits extreme hardness. view more » |
| » ESTIMATION OF PERFORMANCE OF SOME AQUEOUS PIGMENT DISPERSIONS FOR LEATHER FINISHING |
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| Leather coatings quality depends both on viscosity of aqueous pigment dispersions and their surface tensions when roller coating is used as method of application. Rheological behaviour of ten aqueous pigment dispersions was studied and surface tension measured in order to predict their quality as leather finishing from the flow and surface characteristics. view more » |
| » Experimental aspects and magnetic characterization of Magnetospirillum gryphiswaldense. Identification of few applications of magnetotactic bacteria. |
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| Authors: This paper presents the specific experimental aspects of Magnetospirillum gryphiswaldense (a representative magnetotactic bacteria) and of magnetosome (which are defined as intracellular,magnetic single- domain crystals of a magnetic iron mineral that are enveloped by the membrane): the magnetization curve,the hysteresis loop and interpretation on permeability (with Vibrating Sample Probe 7300 Magnetometer). view more » |
| » Formation and properties of some antimony-doped strontium titanate ceramics |
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| ACeramics of SrTi1-xSbxO3 (0 ≤ x ≤ 0.015) composition were prepared by solid state reaction. Samples were obtained after sintering in air at 1300 and 1400ºC, respectively, with a soaking time of 3 hours. view more » |
| » GADOLINIUM IONS EFFECT ON THE CRYSTALLIZATION PROCESS OF SOME CERAMIC SYSTEMS BASED ON SILICA |
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| Increased interest in silicate systems containing different rare earth oxides has results from their important applications in various fields of technology. Glass-ceramics of xGd2O3(1-x)(0.95SiO2 0.05Na2O) composition were prepared by sol-gel method. view more » |
| » Ground and excited state absorption in laser material MgAl2O4:Ni2+ M.G. Brik1,2, N. M. Avram3, C.N. Avram3 |
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| The exchange charge model of crystal field theory has been used to analyze the ground and excited state absorption of octahedrally coordinated Ni2+ ion in MgAl2O4. The parameters of the crystal field acting on the Ni2+ ion are calculated from the crystal structure data. view more » |
| » IMPACT OF TECHNOLOGICAL CHANGES ON INCREASED HEALTH AND COMFORT EFFICIENCY |
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| Microorganisms, such as bacteria and fungi, are omnipresent in the environment. These microorganisms rapidly colonize surfaces including clothing, footwear and other materials. For the most part, these microorganisms do not pose a risk to the health of the individuals that come into contact with them. view more » |
| » INCREASES OF SALT SOLUBILITY IN MAGNETIC TREATED WATER AS STUDIED BY LYOLUMINESCENCE METHOD |
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| Water subjected to magnetic field was used as solvent for the dissolution of some halides, NaCl and KBr. Solubility measurements were carried out by lyoluminescence (LL). Significant differences between the dissolution rates with magnetically treated and untreated water were observed from the LL decay curves. view more » |
| » INVESTIGATION OF KINETICS OF FILLING OF PORES IN THE PROCESS OF HWBE FABRICATION OF InP-PbTe NANOCOMPOSITE |
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| In the present work are presented results of obtaining of nanowires of narrow gap semiconductor systems A4-B6 by hot wall beam epitaxy (HWBE) into nanoporous InP templates. Porous structures was obtained by electrochemical dissolution of bulk InP substrates under conditions of self-arrangement of pores in two-dimensional hexagonal lattice (pore diameter equal to ~45nm and spacing between pores are 60 nm). view more » |
| » Investigations on thermal stability of some ferrocene liquid crystals bearing azo, ferrocenyl and cholesteryl units |
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| Ferrocene liquid crystals received a great attention in the last years, mainly because of its interesting properties and the combination between liquid crystals properties with metals properties. Only few examples of ferrocene liquid crystals bearing either cholesteryl or azo aromatic unit could be found in the literature. view more » |
| » LIGHTWEIGHT MAGNETIC COMPOSITES FOR AIRCRAFT APPLICATIONS |
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| Carbon fibers/polymer matrix composites tend to be used more widely instead of aluminum structures in the aircraft and aerospace industry. There are many reasons that explain the increasing interest for this class of composites due to the lightweight, high strength, high stiffness, good fatigue life, excellent corrosion resistance and low cost manufacturing. view more » |
| » MAGNETIC PROPERTIES OF PYROLYZED POLY--CAPROAMIDE |
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| A new molecular ferromagnetic substance was prepared and its magnetic properties were examined. The product obtained by the pyrolysis of poly--caproamide (PCA) at 700-1000°C has exhibited a ferromagnetic behaviour. view more » |
| » MAGNETIC PROPERTIES OF PYROLYZED POLY--CAPROAMIDE |
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| A new molecular ferromagnetic substance was prepared and its magnetic properties were examined. The product obtained by the pyrolysis of poly--caproamide (PCA) at 700-1000°C has exhibited a ferromagnetic behaviour. view more » |
| » MAGNETIC PROPERTIES OF SOME GADOLINIUM SILICA GLASS CERAMICS |
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| Glass-ceramics of 0.95SiO2-0.05Na2O composition containing up to 20% molar Gd2O3 were obtained by the sol-gel method and heat-treated at 250oC, 500oC and 1000oC. The samples were studied using scanning electron microscopy (SEM), electron paramagnetic resonance (EPR) and magnetic susceptibility measurements. view more » |
| » Nd2Fe14B/-Fe HARD MAGNETIC NANOCOMPOSITE. PERFORMANCES AND LIMITS |
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| The Nd2Fe14B/ view more » |
| » NEW MICRON AND NANO-SIZED POLYMER PARTICLES FOR CONTROLLED DRUG RELEASE |
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| The polymeric containers (micro or nano) reached a great influence after the development of new information, referring to a new concept in the solid tumor biology: EPR– enhanced permeability and retention. view more » |
| » NEW WAg ELECTRICAL CONTACTS WITH ULTRAFINE STRUCTURE FOR LOW VOLTAGE DEVICES |
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| The paper presents the research results concerning the obtaining of a new type of WAg sintered electrical contacts with high silver content for safety switches working in air up to 500 A. The applied method based on powder metallurgy techniques starting with powder mixtures manufacturing by chemical coprecipitation of AgWO4 from aqueous solutions, the precipitate processing by reducing in a H2 stream to a very homogenous and fine dispersed WAg powder mixture and final electrical contact pieces obtaining by pressing, sintering and reshaping. view more » |
| » RADIATION INDUCED OXIDATIVE DEGRADATION OF PE BASED MATERIALS CONTAINING VARIOUS AROMATIC FUSED RINGS COMPOUNDS |
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| The aim of the present paper was to study the effect of some additives which are not properly antioxidants, but can be incorporated in polymers as fillers or as a solid phase to generate composite or nanocomposite materials. view more » |
| » RHEOLOGICAL INVESTIGATIONS OF A POLYMERIC PRECURSOR FOR CERAMIC MATERIALS: EXPERIMENTS AND THEORETICAL MODELING |
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| which has potential application as precursor for the synthesis of silicon oxycarbide ceramics. The cross-linkingreaction of pre-ceramic polymers in the presence of catalyst and/or fillers is one of the key steps in the successfulpolymer-to-ceramic transformation process. view more » |
| » SOFTENING GLASS DRAG SPINNING METHOD OF FABRICATION OF THERMOELECTRIC Bi2Te3 MICROWIRES |
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| Some topics of fabrication technology development of thermoelectric Bi2Te3 microwires as well as several aspects of its physical characterization are presented. A variant of softening glass drag spinning method (SGDSM) with thermal furnace heating was developed for fabrication of glass coated microwires on the basis of semiconductor materials with many components and volatile impurities at high temperatures like Bi2Te3. view more » |
| » SOFTENING GLASS DRAG SPINNING METHOD OF FABRICATION OF THERMOELECTRIC Bi2Te3 MICROWIRES |
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| Some topics of fabrication technology development of thermoelectric Bi2Te3 microwires as well as several aspects of its physical characterization are presented. A variant of softening glass drag spinning method (SGDSM) with thermal furnace heating was developed for fabrication of glass coated microwires on the basis of semiconductor materials with many components and volatile impurities at high temperatures like Bi2Te3. view more » |
| » SPIN CONFIGURATIONS IN EXCHANGE COUPLED MAGNETIC PHASES STUDIED BY MOSSBAUER SPECTROSCOPY |
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| The ability of the 57Fe Mössbauer techniques to reveal the spin structures in exchange coupled magnetic phases containing iron is emphasized. Experimental results obtained on layered exchange-bias systems are presented. view more » |
| » STRUCTURAL AND MAGNETIC PROPERTIES OF Al DOPED Y2CaMn3O9 PEROVSKITES |
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| The Y2CaMn3O9 perovskites crystallize in an orthorhombic type structure having Pnma-space group. The magnetic measurements show the presence of spin-glass type behavior. The maxima in the temperature dependences of the magnetization in ZFC cooled sample, decrease from Tm= 30 K (x=0) to 18. view more » |
| » STUDY ABOUT ANTIOXIDATIVE ACTIVITY OF SEVERAL DIPHOSPHONATES COMPOUNDS ON LDPE THERMOOXIDATIVE STABILITY |
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| The thermal degradation of low density polyethylene in the presence of several esters – diphosphonates compounds mostly used in anticancer treatment – was investigated by chemiluminescence at three temperatures: 1800C, 1900C and 2000C. view more » |
| » TEXTURE OF ELECTROLYTIC Mo DEPOSITION FROM MOLTEN ALKALI HALIDE |
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| The electrocrystallization and texture of electrodeposited molybdenum in molten electrolytes has been investigated. Nucleation and growth of molybdenum electrodeposition on nickel electrode in NaCl-KCl-NaF molten electrolyte containing K2MoO4 under potentiostatic and galvanostatic conditions at 1123 K were focused on the influence of electrodeposition conditions on the nucleation phenomena and growth kinetics. view more » |
| » THE INVESTIGATION OF SOME BIOCHEMICAL PROPERTIES OF S-LAYER, A BIOPOLYMER OF THE CELL ENVELOPE FROM EXTREMELY HALOPHILIC ARCHAEA |
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| Crystalline bacterial surface layers (S-layers) are one of the most common cell envelope components of prokaryotic organisms (Archaea and Bacteria). S-layers are monomolecular arrays composed of a single protein or glycoprotein and represent the simplest biological membranes developed during evolution. view more » |
| » The magnetic effects in Sr2FeMoO6 perovskite type compound obtained by soft chemistry |
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| Recently, a double perovskite oxide, Sr2FeMoO6, has been reported to show a very sharp magnetoresistance (MR) response at relatively small-applied fields and at high temperatures. The half-metallic state of this compound ensures a theoretical magnetic moment of 4 µB per formula unit. view more » |
| » THEORETICAL AND EXPERIMENTAL CONSIDERATIONS OF THE PIEZOCERAMIC PROPERTIES TO DESIGN THE MICROMOTORS AND MICROACTUATORS |
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| In this paper , the theoretical and experimental relationship between the piezoceramic ratio and parametersand design elements of piezoceramic micromotors and microactuators have been developed.Essentially a theoretical commentary on the ceramic properties (used in fabrication of piezoceramicmicroactuators and micromotors) is presented ; dielectric constant ; 33 31 , ε ε , piezoelectric parameters ;33 31 , d d , compliance, dielectric loss and mechanical coupling ratio. view more » |
No
1 Jan - 30 Mar 2006 
