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Fragmentation Analysis of Single-Fiber Carbon Composites
Development of Compression Bending Test Method for Advanced Composites - A Review
Damage Monitoring of Al2O3/Epoxy Laminates with Luminance Change of Transmitted Light from EL Device
Development of TTMSP to Predict the Performance of Discontinuous Natural Fibre-Polymer Composites
''Geopolymers": same basic chemistry, different microstructures
The present paper describes the effect of certain working variables on the microstructural evolution of oven-dried, alkali-activated fly ash. The results show that the main reaction product in the activation process (in all the systems studied) is an amorphous aluminosilicate gel with a three-dimensional structure. No…
Thin copolymer-cased light-emitting display made with fluorine-foped tin oxide substrates
Seven-segment displays are used to show numerical quantities in electronic equipment, being present in most of the low-end electronics. In this work we describe a novel organic light emitting display made with poly(1,10 decanedioxy 2 methoxy - 1,2 phenylene - 1,2 ethenylene - 3,6 dimethoxy - 1,4 phenylene - 1,2 etheny…
HPMA and HEMA copolymer bead interactions with eukaryotic cells
Two different hydrophilic acrylate beads were prepared via aqueous suspension polymerization. Beads produced of a hydroxypropyl methacrylate (HPMA) and ethyleneglycol methacrylate (EDMA) copolymer were obtained using a polyvinyl alcohol suspending medium. Copolymers of 2hydroxyethyl methacrylate (HEMA), methyl methacr…
Microstructure and mechanical properties of WC-Co reinforced with NbC
Cemented carbides such as tungsten carbide-cobalt WC-Co composites have been widely used as cutting tool materials. Several reports have shown the influence of different factors such as grain size, type and amount of binder phase and the addition of hard particles on the properties of WC-Co. The purpose of this work w…
The use of a vickers indenter in depth sensing indentation for measuring elastic modulus and vickers hardness
Depth sensing indentation is a powerful experimental technique for determining mechanical properties of materials. In this work a computational routine was developed based on Oliver-Pharr method for measuring a more precise values of elastic modulus using a Fischerscope H100 depth sensing indentation apparatus, with a…
Progressive Failure Analysis of Composite Laminates Subjected to In-Plane Compressive and Shear Loadings
Identification of Damping Parameters for Laminated Shallow Cylindrical Shells
Materials and Structural Design for Lightweight Primary Mirrors
Effect of the deposition conditions of platinum electrodes on their performance as resistive heating elements
The performance of different platinum electrodes used as resistive heating elements was studied. Pt films having different thickness were deposited by RF magnetron sputtering at room temperature followed by post-deposition annealing at 700 ºC or made in-situ at 700 ºC. The Pt films were deposited over oxidized silicon…
Nucleation and growth microstructural study of ti films on 304 SS substrates
Coating of steel surfaces with titanium films has been studied with the objective to protect them against corrosion, and to create an intermediate film for CVD diamond and TiN film deposition. In this work, the nucleation, growth mechanisms and microstructural formation of the titanium films deposited on 304 stainless…
Effects of annealing on electrical and optical properties of a multilayer InAs/GaAs quantum dots system
A systematic investigation of the properties of the InAs/GaAs self-assembled quantum dots (SAQDs) system subjected to a post-growth annealing using capacitance-voltage, Raman scattering and photoluminescence measurements is presented. The application of both electrical and optical methods allowed us to obtain reliable…
The Monastery of Uclés (Cuenca, Spain): characterization and deterioration of building materials
Building materials from the Monastery of Uclés façades, in Cuenca (16th-18 th centuries), have been characterised, as well as identified their deterioration forms. Characterization consisted of the determination o mineralogical and petrographical properties of building materials; petrophysical and petrochemical charac…
Phase relations study on the melting and crystallization regions of the Bi-2223 high temperature superconductor
The melting and solidification behavior of Bi2Sr2Ca2Cu3 O10 (Bi-2223) precursors has been studied. Nominal compositions corresponding to excess of liquid, Ca2CuO3 and CuO have been investigated. Each sample was made by packing a precursor powder into a silver crucible, in order to approximately simulate the situation…
Liquid phase sintered SiC ceramics from starting materials of different grade
Possibility of high performance ceramics manufactured from commercial SiC powder of technical grade has been shown. Sintering behavior and microstructure formation under conditions of liquid phase sintering (LPS) with oxynitride sintering aids (AlN-Y2O3) of three SiC-based compositions have been investigated. Two of t…
Si3N4 ceramics sintered with Y2O3/SiO2 and R2O3(ss)/SiO2: a comparative study of the processing and properties
A comparative study was made of Si3N4 sintered with two types of additives, namely, Y2O3/SiO2 and R2O3(ss)/SiO2, R2O3(ss) being a rare earth metal oxide in solid solution. The processing conditions for both types of Si3N4 were 14 vol% of additives and a sintering temperature of 1800 ºC for 30, 60 and 240 min. To compa…