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THE EFFECT OF COOLING RATE ON THERMAL RESIDUAL STRAINS IN CARBON/POLYPROPYLENE MICROCOMPOSITES
Micromechanical Behavior of Graphite / Epoxy Composites Part I: The Effect Of Fiber Sizing.
Dry and wet "deposition" studies of the degradation of cement mortars
The reaction of portland cement mortars with SO2 gaseous pollutant and artificial 'acid rain' solution has been examined using laboratory exposure chambers, with realistic presentation rates of pollutants. The mortar were previously carbonated to produce superficial carbonation. Two mortars with different w/c ratio an…
El corte de rocas ornamentales con discos diamantados: influencia de los factores propios del sistema de corte
A review of some relevant papers about the cutting of ornamental stones with diamond tools is presented here with the aim of being useful to the Natural Stone industries. Due to the length of this paper, it has been divided in two parts: in the first one, the influence of the factors of the cutting equipments (machine…
MICROMECHANICS OF MODEL CARBON EPOXY COMPOSITES CURED USING MICROWAVE HEATING
Principal Component Mapping Applied to Raman Microspectroscopy of Fiber-Reinforced Polymer Composites
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Micromechanical Behavior of Graphite / Epoxy Composites , Part II: Interfacial Durability
Study of mortars with industrial residual plastic scales
This work proposes the utilization of industrial residues of PET (Polyethylene Terephtalate) as a partial substitute of arids (sand) in mortar making for construction components. Therefore, the environmental impact of large volumes of plastic of urban residues could be decreased. When PET scales were added to mortars…
Residual Strains in an Al 2 O 3 ‐Ni Joint Bonded with a Composite Interlayer: Experimental Measurements and FEM Analyses
A cylindrical Al 2 O 3 ‐Ni joint bonded with a 4.0 mm thick composite interlayer of 40 vol% Al 2 O 3 ‐60 vol% Ni was fabricated by powder processing, and the residual strains in the specimen were studied experimentally using neutron diffraction, X‐ray diffraction, and optical fluorescence spectroscopy. Experimental me…
Frequency and temperature dependence of the refractive index of sapphire
Because the index of refraction is temperature dependent, a temperature gradient across a window causes image blur and bore sight error. Prior to this paper, there have been no direct temperature-dependent measurements reported on the mid-infrared refractive index for sapphire, a popular infrared window material of hi…
Electromechanical Properties of Poly-L-Lactic Acid
The electromechanical coupling coefficient, the piezoelectric constant, the elastic compliance constant and the mechanical quality factor for a poly-L-lactic acid (PLLA) plate elongated to 4 times the original length were determined by a self-resonant method. k 14 =0.064, d 14 =9.82×10 -12 C/N, s 44 E =9.28×10 -10 m 2…
Microstructural analysis of strip cast Nd–Fe–B alloys for high (BH)max magnets
High energy density magnets >400 kJ/m3 are increasingly used in many applications. Conventional casting techniques for sintered magnets reveal the formation of a high quantity of α-Fe and large Nd-rich regions. New techniques, like strip casting, produce homogeneous and fine scaled microstructures and are alrea…
Thermodynamic constraints on reflectance reciprocity and Kirchhoff’s law
Contrary to common belief, neither reciprocity of the bidirectional reflectance distribution function (BRDF) nor the directional form of Kirchhoff's electromagnetic radiation law can be demonstrated on the basis of energy conservation. The BRDF is generally considered reciprocal as an extension of Helmholtz reciprocit…
Caracterización fisicoquímica del yeso natural de Mauritania
Gypsum from "Nderhamcha", a region in Mauritania, has been studied through three techniques: thermo-gravimetry, thermo-differential analysis, and X ray diffraction. It has been proved that the dehydration of this material happens in two stages, characterized by the closeness of their temperature. The thermal study as…
Composite Polarons in Ferromagnetic Narrow-band Metallic Manganese Oxides
A new mechanism is proposed to explain the colossal magnetoresistance and related phenomena. Moving electrons accompanied by Jahn-Teller phonon and spin-wave clouds may form composite polarons in ferromagnetic narrow-band manganites. The ground-state and finite-temperature properties of such composite polarons are stu…
A novel single-crystal adsorption calorimeter and additions for determining metal adsorption and adhesion energies
A new microcalorimeter for measuring heats of adsorption on clean single-crystal surfaces is described, and its operational characteristics are presented. The principle is similar to that pioneered by David King’s group: A pulse of gas from a molecular beam adsorbs on an ultrathin single crystal’s surface, causing a m…