نتایج جستجو برای: matrix dispersion

تعداد نتایج: 423371  

2016
Shijo Thomas V Umasankar

Light weight materials coupled to the need for cost-effective processing have combined to create a significant opportunity for aluminium powder metallurgy as its increasing interest. Aluminium alloy (AA 2219) metal matrix composite reinforced with multi walled carbon nanotube (MWCNT) produced by powder metallurgy (P/M) technique was analysed and CNTs dispersion were traced. The micro hardness a...

2013
Isabelle Giraud Sophie Franceschi-Messant Emile Perez Colette Lacabanne Eric Dantras

In this work, different sizing agent aqueous dispersions based on polyetherimide (PEI) were elaborated in order to improve the interface between carbon fibers and a thermoplastic matrix (PEEK). The dispersions were obtained by the emulsion/solvent evaporation technique. To optimize the stability and the film formation on the fibers, two surfactants were tested at different concentrations, with ...

2001
HENRIK HULT F. LINDSKOG

In this paper we clarify dependence properties of elliptical distributions by deriving general but explicit formulas for the coefficients of upper and lower tail dependence and spectral measures with respect to different norms. We show that an elliptically distributed random vector is regularly varying if and only if the bivariate marginal distributions have tail dependence. Furthermore, the ta...

2002
J. DiMaio S. Rhyne K. Fu R. Czerw J. Xu S. Webster Y.-P. Sun D. L. Carroll John Ballato

Organic/inorganic matrix nanocomposites have been created using an acid catalyzed, tetraethyl orthosilicate-based sol–gel technique with single-walled carbon nanotubes (SWNTs). By utilizing nanotubes functionalized with the dendron methyl 3,5-di(methyltrigycoloxy)benzylic alcohol (IPEG), ultrasonic blending in the sol phase prior to gelation yields excellent dispersion characteristics of the na...

2012
Antonio Greco Alessia Timo Alfonso Maffezzoli

The aim of the present work is the development of amorphous thermoplastic matrix nanocomposites based on graphite nanoparticles. Different types of graphite were used, including unmodified graphite, graphene nanoplatelets and graphite intercalation compounds. Graphite intercalation compounds were subjected to thermal treatment to attain exfoliation of the nanofiller. The exfoliation process was...

2010
J. C. Palomares Salas A. Agüera Pérez J. J. G. de la Rosa J. G. Ramiro

In this paper it is shown a process to demarcate areas with analogous wind conditions. For this purpose a dispersion graph between wind directions will be traced for all stations placed in the studied zone. These distributions will be compared among themselves using the hierarchical clustering algorithm. This information will be used to build a matrix, letting us work with all relations simulta...

Journal: :Journal of the Optical Society of America. A, Optics, image science, and vision 2006
Hema Roychowdhury Govind P Agrawal Emil Wolf

Expressions are derived for the cross-spectral density matrix of an electromagnetic Gaussian Schell-model beam propagating through a paraxial ABCD system. Using the recently developed unified theory of coherence and polarization of electromagnetic beams and the ABCD matrix for gradient-index fibers, we study the changes of the spectral density, of the spectral degree of polarization, and of the...

Journal: :Physical review. B, Condensed matter 1991
Pryor

The subband structure and band-to-band optical matrix elements are computed for serpentine superlattice quantum-wire arrays. The subband dispersion and bandwidths are examined as a function of the curvature of the confining barriers and of the barrier height separating the wires. The optical matrix elements show a strong polarization dependence, even when the coupling between wires in the array...

1998
H. Yamada I. Manas-Zloczower D. L. Feke

The dispersion of carbon black agglomerates suspended in polydimethyl siloxane (PDMS) or polybutadiene (PBD) liquids has been studied. Agglomerates comprised of either a low-structure or a high-structure carbonblack were subjected to simple shear flow. Two characteristic length scales that affect the dispersion process are identified. One length scale (Lp) is a measure of the ease with which fl...

2015
José Covas Eunice Cunha Maria C. Paiva Loic Hilliou

Graphite nanoplates (GnPs) are exfoliated graphite particles in the form of thin flakes—with large surface areas and nanosized thicknesses— that tend to agglomerate because of van der Waals interactions. GnPs are commonly used to reinforce composite materials. It is expected that maximum composite performance levels should occur when GnP agglomerates are dispersed within the polymer matrix as p...

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