The refractive index of a liquid medium is an important optical parameter since it exhibits the optical properties of the liquid. Its values are often required to interpret various types of spectroscopic data. The int...The refractive index of a liquid medium is an important optical parameter since it exhibits the optical properties of the liquid. Its values are often required to interpret various types of spectroscopic data. The intensity distribution and contrast of image speckle patterns obtained for Zamzam, bottled drinking and distilled waters are investigated on a computer as a function of six discrete wavelengths across the visible spectrum. The present novel computer simulation speckle photography using Fourier transform study and the new theoretical background have been confirmed with previous experimental results. Uncertainty of refractive index measurements was studied on a wide range of discrete wavelengths using the computer simulation and the new theoretical formulae.展开更多
This paper presents the mechanical and thermal properties of flax fabric reinforced fly ash based geopolymer composites.Geopolymer composites reinforced with 2.4,3.0 and 4.1 wt%woven flax fabric in various layers were...This paper presents the mechanical and thermal properties of flax fabric reinforced fly ash based geopolymer composites.Geopolymer composites reinforced with 2.4,3.0 and 4.1 wt%woven flax fabric in various layers were fabricated using a hand lay-up technique and tested for mechanical properties such as flexural strength,flexural modulus,compressive strength,hardness,and fracture toughness.All mechanical properties were improved by increasing the flax fibre contents,and showed superior mechanical properties over a pure geopolymer matrix.Fourier transform infrared spectroscopy(FTIR)and scanning electron microscopy(SEM)studies were carried out to evaluate the composition and fracture surfaces of geopolymer and geopolymer/flax composites.The thermal behaviour of composites was studied by thermogravimetric analysis(TGA)and the results showed significant degradation of flax fibres at 300℃.展开更多
文摘The refractive index of a liquid medium is an important optical parameter since it exhibits the optical properties of the liquid. Its values are often required to interpret various types of spectroscopic data. The intensity distribution and contrast of image speckle patterns obtained for Zamzam, bottled drinking and distilled waters are investigated on a computer as a function of six discrete wavelengths across the visible spectrum. The present novel computer simulation speckle photography using Fourier transform study and the new theoretical background have been confirmed with previous experimental results. Uncertainty of refractive index measurements was studied on a wide range of discrete wavelengths using the computer simulation and the new theoretical formulae.
文摘This paper presents the mechanical and thermal properties of flax fabric reinforced fly ash based geopolymer composites.Geopolymer composites reinforced with 2.4,3.0 and 4.1 wt%woven flax fabric in various layers were fabricated using a hand lay-up technique and tested for mechanical properties such as flexural strength,flexural modulus,compressive strength,hardness,and fracture toughness.All mechanical properties were improved by increasing the flax fibre contents,and showed superior mechanical properties over a pure geopolymer matrix.Fourier transform infrared spectroscopy(FTIR)and scanning electron microscopy(SEM)studies were carried out to evaluate the composition and fracture surfaces of geopolymer and geopolymer/flax composites.The thermal behaviour of composites was studied by thermogravimetric analysis(TGA)and the results showed significant degradation of flax fibres at 300℃.
