Abstract In this study, sound absorbing materials were produced through foam forming technique using hardwood and softwood pulps with varying chemical composition, ultrastructural, morphological properties as raw materials. The absorption of the foams measured related to ultrastructure morphology pulp fibres. All fibre provided comparable those conventional porous used for acoustic purposes. ge...

We have developed a technique which allows optical absorption measurements to be made using a pulsed light source and offers a sensitivity significantly greater than that attained using stabilized continuous light sources. The technique is based upon the measurement of the rate of absorption rather than the magnitude of absorption of a light pulse confined within a closed optical cavity. The de...

ZnO plays an important role in many semiconductors technological aspects.  Here,  direct  precipitation  method  was  employed  for  the synthesis of nano-sized hexagonal ZnO particles, which is based on chemical  reactions between  raw materials used  in  the  experiment. ZnO  nanoparticles  were  synthesized  by  calcinations  of  the  ZnO precursor precipitates  at 250  ˚C  for 3hours. ...

Abstract We fabricated nanoparticles of Zn ferrite the chemical formula ZnFe2O4 using auto-combustion technique, and investigated their magnetic spin distribution frequency response to optical excitation. Optical absorption characterization were carried out in UV–Vis IR range, extended on low side down THz domain. The also characterized by X-ray diffraction force microscopy. dielectric constant...