Publications


2006

Olwal, TO, Van Wyk MA, Chatelain D, Odhiambo M, Van Wyk BJ.  2006.  Soft Timing Recovery Framework for Cellular Receivers.
Olwal, TO, Van Wyk MA, Chatelain D, Odhiambo M, Van Wyk BJ.  2006.  Soft Timing Phase Estimation for Wireless Mobile Systems.
Olwal, TO, Van Wyk MA, Van Wyk MA, Odhiambo M, Van Wyk BJ.  2006.  Low Variance Timing Recovery in Turbo Receivers.
Olwal, TO, Van Wyk MA, Van Wyk BJ, Odhiambo M, Chatelain D.  2006.  Improved Timing Recovery in Wireless Mobile Receivers.
OTIENO, MROLWALTHOMAS.  2006.  - Olwa et al (2006a) considers a multidimensional timing phase shift as a vector within a transmitted time frame. The timing shift vector is modelled as a random walk. A combined discrete polyphase matched filter and iterative turbo receiver outputs are u. Faculty of Veterinary Medicine Biennial Scientific Conference November 2004, Nairobi.. : Journal of Applied Biosciences Abstract
Hydro-distilled volatile oils from the leaves of Ocimum gratissimum L. (Lamiaceae) from Meru district in Eastern Kenya were analysed by gas chromatography-mass spectrometry (GC-MS) and also evaluated for antimicrobial activity. The oil was dominated by monoterpens which accounted for 92.48%. This monoterpene fraction was characterized by a high percentage of eugenol (68.8%). The other major monoterpenes were methyl eugenol (13.21%), cis-ocimene (7.47%), trans-ocimene (0.94%), β-pinene (1.10%) and camphor (0.95%). The sesquiterpenes present in fairly good amounts were germacrene D (4.25%) and trans-caryophyllene (1.69%). The minor sesquiterpenes were α-farnesene (0.85%) and β-bisabolene (0.74%). The antimicrobial activities of the essential oils were evaluated against both Gram positive (Staphylococcus aureus, Bacillus spp.) and Gram negative (Escherichia coli, Pseudomonas aeruginosae, Salmonella typhi, Klebisiella pneumoniae, Proteus mirabilis) bacteria and a pathogenic fungus Candida albicans. The oil had pronounced antibacterial and antifungal activities on all the microbes.
OTIENO, MROLWALTHOMAS.  2006.  - Olwal et al. (2006b) investigates a Cramer-Rao bound on the unbiased timing phase estimation proposed in Olwal et al. (2006a). the Cramer-Rao bound on variance performance yields improved bit error rate performance in GSM receivers. The non data aided a. Faculty of Veterinary Medicine Biennial Scientific Conference November 2004, Nairobi.. : Journal of Applied Biosciences Abstract
Hydro-distilled volatile oils from the leaves of Ocimum gratissimum L. (Lamiaceae) from Meru district in Eastern Kenya were analysed by gas chromatography-mass spectrometry (GC-MS) and also evaluated for antimicrobial activity. The oil was dominated by monoterpens which accounted for 92.48%. This monoterpene fraction was characterized by a high percentage of eugenol (68.8%). The other major monoterpenes were methyl eugenol (13.21%), cis-ocimene (7.47%), trans-ocimene (0.94%), β-pinene (1.10%) and camphor (0.95%). The sesquiterpenes present in fairly good amounts were germacrene D (4.25%) and trans-caryophyllene (1.69%). The minor sesquiterpenes were α-farnesene (0.85%) and β-bisabolene (0.74%). The antimicrobial activities of the essential oils were evaluated against both Gram positive (Staphylococcus aureus, Bacillus spp.) and Gram negative (Escherichia coli, Pseudomonas aeruginosae, Salmonella typhi, Klebisiella pneumoniae, Proteus mirabilis) bacteria and a pathogenic fungus Candida albicans. The oil had pronounced antibacterial and antifungal activities on all the microbes.
OTIENO, MROLWALTHOMAS.  2006.  Olwal et al. (2006c) proposes Log-MAP and SOVA based timing recovery methods in wireless channels. The proposed algorithms exploit the turbo receiver soft outputs to compute the posterior means, which are more reliable and accurate in generating stable, b. Faculty of Veterinary Medicine Biennial Scientific Conference November 2004, Nairobi.. : Journal of Applied Biosciences Abstract
Hydro-distilled volatile oils from the leaves of Ocimum gratissimum L. (Lamiaceae) from Meru district in Eastern Kenya were analysed by gas chromatography-mass spectrometry (GC-MS) and also evaluated for antimicrobial activity. The oil was dominated by monoterpens which accounted for 92.48%. This monoterpene fraction was characterized by a high percentage of eugenol (68.8%). The other major monoterpenes were methyl eugenol (13.21%), cis-ocimene (7.47%), trans-ocimene (0.94%), β-pinene (1.10%) and camphor (0.95%). The sesquiterpenes present in fairly good amounts were germacrene D (4.25%) and trans-caryophyllene (1.69%). The minor sesquiterpenes were α-farnesene (0.85%) and β-bisabolene (0.74%). The antimicrobial activities of the essential oils were evaluated against both Gram positive (Staphylococcus aureus, Bacillus spp.) and Gram negative (Escherichia coli, Pseudomonas aeruginosae, Salmonella typhi, Klebisiella pneumoniae, Proteus mirabilis) bacteria and a pathogenic fungus Candida albicans. The oil had pronounced antibacterial and antifungal activities on all the microbes.

2005

Olwal, TO, Van Wyk MA, Chatelain D, Van Wyk BJ.  2005.  Soft information-based timing phase recognition in asynchronous digital receivers.
OTIENO, MROLWALTHOMAS.  2005.  - Olwal et al, (2005) proposes a synchronous digital receiver that implements a timing phase shift estimator incorporated after a free running sampling circuit. The timing phase shift estimator is designed by combining a discrete root raised cosine matche. Faculty of Veterinary Medicine Biennial Scientific Conference November 2004, Nairobi.. : Journal of Applied Biosciences Abstract
Hydro-distilled volatile oils from the leaves of Ocimum gratissimum L. (Lamiaceae) from Meru district in Eastern Kenya were analysed by gas chromatography-mass spectrometry (GC-MS) and also evaluated for antimicrobial activity. The oil was dominated by monoterpens which accounted for 92.48%. This monoterpene fraction was characterized by a high percentage of eugenol (68.8%). The other major monoterpenes were methyl eugenol (13.21%), cis-ocimene (7.47%), trans-ocimene (0.94%), β-pinene (1.10%) and camphor (0.95%). The sesquiterpenes present in fairly good amounts were germacrene D (4.25%) and trans-caryophyllene (1.69%). The minor sesquiterpenes were α-farnesene (0.85%) and β-bisabolene (0.74%). The antimicrobial activities of the essential oils were evaluated against both Gram positive (Staphylococcus aureus, Bacillus spp.) and Gram negative (Escherichia coli, Pseudomonas aeruginosae, Salmonella typhi, Klebisiella pneumoniae, Proteus mirabilis) bacteria and a pathogenic fungus Candida albicans. The oil had pronounced antibacterial and antifungal activities on all the microbes.

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