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Mechanical stresses upon crystallization in phase change materials
(American Institute of Physics, 2001)
Crystallization processes in different Te alloys, employed in phase change materials for optical data storage, have been investigated by in situ mechanical stress measurements. Upon crystallization a considerable stress ...
Electron Impact Excitation of 2 1S State of Helium Atom
(Faculty of Science Kenyatta University, 2005)
We have applied a distorted wave method to calculate the differential cross sections for 2 1S
excitation of helium atom by electron impact in the energy range of 50-200 eV. The results are
compared with some other ...
In situ measurements of thickness changes and mechanical stress upon gasochromic switching of thin MoOx films
(American Institute of Physics (AIP), 2004)
Thin films of MoOx coated with platinum as a catalyst were prepared by dc magnetron sputtering from a molybdenum target in an oxygen and argon atmosphere. The films were colored and bleached by exposure to diluted hydrogen ...
Surface characterization and Molecular Dynamics of Nandi flame seed cuticle
(school of Pure and Applied Sciences of Kenyatta University, 2008)
Surface Probe Microscopy and Fourier Transform Infrared (FTIR)
spectroscopy have been used to characterize Nandi flame Seed Cuticles
(NFSC). The FTIR has revealed that cuticles are predominantly
composed of Pectin and ...
Gravity Survey of Lake Magadi Area
(Faculty of Science Kenyatta University, 2005)
A gravity survey was conducted in the area surrounding Lake Magadi to investigate presence of
any geological bodies related to high heat [low in the area. Gravity stations were established by
filling up the unsurveyed ...
Thermal Conductivity Parameters for Semi-crystalline Polymers
(Faculty of Science Kenyatta University, 2005)
The nature and the form that the high temperature thermal conductivity model for semicrystalline
polymers should take have been modeled from a thermal conductivity response
curve for isotropic polypropylene at 298 K and ...
Density changes upon crystallization of Ge2Sb2.04Te4.74 films
(2002-05)
The density of sputtered Ge2Sb2.04Te4.74 thin films upon annealing has been precisely determined by x-ray reflection and compared to the values determined from x-ray diffraction (XRD) data. The film density increases in ...
The role of backscattered energetic atoms in film growth in reactive magnetron sputtering of chromium nitride
(IOP Publishing, 2007-02-07)
In this work the impact of backscattered energetic atoms on film growth in reactive sputtering of CrNx (x _ 1) is manifested. We use film and plasma characterization techniques, as well as simulations in order to study the ...
Optical studies of doped amorphous arsenic triselenide
(Faculty of Science Kenyatta University, 2000)
Photoconductivity of As2Se3:Alx and As2Se3:Cux was investigated using light of visible spectrum of
wavelengths A. = 0.67 um & 0.47 urn. Two regimes were observed: regime 1, the high temperature
region above maximum ...
Natural and artificial radioactivity levels in sediments along the Kenyan coast
(Elsevier, 2004-11)
Exposures to various components of the natural background radiation in Kenya were estimated using measured activity concentrations of natural radionuclides and conversion factors. Contributions to the total effective dose ...