Now showing items 61-70 of 477
Periodic Variations in the Wavelength Distributions following Photon Interferences: Analogy with Electron Interferences
(Hindawi Publishing Corporation, 2012-12)
A new interference phenomenon is reported, which has so far not been observed with either matter or light. In a nanometer-sized version of Feynman’s famous two-slit “thought” experiment with single electrons, the width of ...
Pore size distribution in soils irrigated with sodic water and wastewater
(Sociedade Brasileira de Ciência do Solo, 2010)
Soil porosity, especially pore size distribution, is an important controlling factor for soil infiltration, hydraulic conductivity, and water retention. This study aimed to verify the effect of secondary-treated domestic ...
Design of hierarchical porous aluminas by using one-pot synthesis and different calcination temperatures
Hierarchical aluminas with pore sizes ranging from a few nanometers to micrometers were obtained using an one-pot sol-gel synthesis. The aluminas were synthesized under acid conditions from aluminum isopropoxide in presence ...
Effects of poly(vinyl alcohol) additions on the structure of silica xerogels
(Elsevier B.V., 2009-09-01)
Poly(vinyl alcohol)/silica hybrid xerogels were prepared from sonohydrolysis of tetraethoxysilane (TEOS) and additions of water-solution of poly(vinyl alcohol) (PVA). The samples were Studied by small-angle X-ray scattering ...
Armazenamento de água no solo em sequências de culturas de verão e inverno sob semeadura direta
(Universidade Estadual Paulista (UNESP), 2014)
Critical behaviour of the Ising ferromagnet confined in quasi-cylindrical pores: A Monte Carlo study
(American Institute of Physics, 2013-10)
The critical behaviour of the Ising ferromagnet confined in pores of radius R and length L is studied by means of Monte Carlo computer simulations. Quasi-cylindrical pores are obtained by replicating n-times a triangular ...
Metodologia para o estudo da porosidade de dolomita em ensaio de sulfatação interrompida
(Sociedade Brasileira de Química, 2010)
The aim of this work is to propose a methodology to evaluate the evolution of the pore blockage of limestone during the sulfation reaction. The experiments were performed for a national limestone (dolomite) with average ...
Small-angle X-ray scattering and nitrogen adsorption study of the nanoporosity elimination in TEOS sonohydrolysis-derived xerogels
Small-angle X-ray scattering (SAXS) and nitrogen adsorption techniques were used to study the temperature and time structural evolution of the nanoporosity in silica xerogels prepared from acid- and ultrasound-catalyzed ...