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Browsing by Subject "SAIP 2010"

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Comparative attenuation spectra of liquid skin-like phantoms

Author: Singh, A ; Smit, Jacoba E ; Karsten, AE ; Grobler, AF ; Sparrow, RW Date: Sep 2010 This study aims to extract and compare attenuation coefficients of different liquid skin-like phantoms representing Skin Types 1 to V1 with two methods, Spectrophotometric and Integrating Sphere methods. The correlation between the results ... Read more
Determination of the emissivity of the tungsten hexa-ethoxide pyrolysis flame using Fourier Transform Infrared (FTIR) spectroscopy

Author: Mudau, AE ; Mwakikunga, Bonex W ; Brink, N ; Willers, Cornelius J ; Forbes, A ; Shikwambana, L ; Govender, M Date: Sep 2010 To determination the temperature using infrared cameras, the following issues need to be addressed, the emissivity of the object and atmospheric path effects. The later is negligible in the setup used. In this paper authors present the ... Read more
Different light sources in photodynamic therapy for use in photorejuvenation

Author: Van Kets, V ; Karsten, A ; Davids, L Date: Sep 2010 Photodynamic therapy (PDT) has recently emerged as a treatment modality for photorejuvenation of the skin. This study is a preliminary investigation into the effect of different light sources to activate hypericin, a plant-derived photosensitizer ... Read more
Experimental phantom verification studies for simulations of light interactions with skin: liquid phantoms

Author: Karsten, A ; Singh, A ; Almonem, SA Date: Sep 2010 Raytracing computer models are valuable tools to determine the fluence at a specific depth into issue, but need to be verified before they can be used with confidence. Such a model for skin showed good agreement (within 10%) when compared ... Read more
Integrating sphere-based setup as an accurate system for optical properties measurements

Author: Abdalmonem, S ; Harith, MA ; Amin, RM ; Karsten, A ; Singh, A Date: Sep 2010 Determination of the optical properties of solid and liquid samples has great importance. Since the integrating sphere-based setup is used to measure the amount of reflected and transmitted light by the examined samples, optical properties ... Read more
Interferometric method to determine the Kerr constant of perspex and ZnSe

Author: Govender, P ; Couling, VW Date: Sep 2010 An adapted Michelson interferometric technique was used to measure strain induced birefringence in perspex. The birefringence was then used to determine the Kerr constant in perspex. The result obtained is compared to a colarimetric result ... Read more
Measurements of temperature of the tungsten hexa-ethoxide pyrolysis flame using IR camera

Author: Mudau, AE ; Mwakikunga, Bonex W ; Brink, N ; Willers, Cornelius J ; Forbes, A ; Shikwambana, L ; Govender, M Date: Sep 2010 In laser pyrolysis, temperature measurement and control plays a vital role during the development of nanoparticles. Authors present the results of temperature measurements using infrared camera on a tungsten hexa-ethoxide pyrolysis flame used ... Read more
Optical system to study temperature influenced chemical and mechanical changes to the PCD structure

Author: Masina, Bathusile N ; Forbes, A Date: Sep 2010 This presentation acknowledges that temperature induces damage in the diamond bits due to friction during the drilling process. The temperature of the diamond sample can be raised by laser heating it. Read more
Selective excitation of a vibrational level within the electronic ground state of a polyatomic molecule with ultra pulses

Author: de Clercq, L ; Botha, L ; Uys, H ; Du Plessis, A ; Rohwer, E Date: Sep 2010 Coherent control of the upper vibrational level populations in the electronic ground state of a polyatomic molecule was simulated. Results indicate that selective excitation of a specific upper state level is possible Read more
Selective excitation of a vibrational level within the electronic ground state of a polyatomic molecule with ultra short pulses

Author: De Clercq, L ; Botha, L ; Uys, H ; Du Plessis, A ; Rohwer, E Date: Sep 2010 Coherent control of the upper vibrational level populations in the electronic ground state of a polyatomic molecule was simulated. Results indicate that selective excitation of a specific upper state level is possible. Read more
An ultrafast study of Zinc Phthalocyanine in DMSO

Author: Ombinda-Lemboumba, Saturnin ; du Plessis, A ; Botha, LR ; Rohwer, EG ; Steenkamp, CM Date: Oct 2010 The ultrafast dynamics of Zinc Phthalocyanine was studied using trasient absorption pump probe spectroscopy. Zinc Phthalocyanine was excited (pumped) at 672nm and probed by a white light continuum. The pump-probe technique used in this study ... Read more

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Browsing by Subject "SAIP 2010"

Browsing by Subject "SAIP 2010"

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