Publications

Found 36 results

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Forthcoming
Cheruiyot EK, Mito CO, Kaduki KA, Laneve G, Khoshelham K. "Aquatic vegetation prediction models based on water quality parameters and meteorological conditions.". Forthcoming.
2016
Bagui OK, Kaduki KA, Berrocal E, Zoueu JT. "Structured Laser Illumination Planar Imaging Based Classification of Ground Coffee Using Multivariate Chemometric Analysis." Applied Physics Research. 2016;8(3):32. Abstract
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2014
Omucheni DL, Kaduki KA, Bulimo WD, Angeyo HK. "Application of principal component analysis to multispectral-multimodal optical image analysis for malaria diagnostics." Malar. J.. 2014;13:485. Abstract

Multispectral imaging microscopy is a novel microscopic technique that integrates spectroscopy with optical imaging to record both spectral and spatial information of a specimen. This enables acquisition of a large and more informative dataset than is achievable in conventional optical microscopy. However, such data are characterized by high signal correlation and are difficult to interpret using univariate data analysis techniques.

Angeyo HK, Dehayem-Massop A, Kaduki KA. "Analysis and Spectral Imaging Approaches to Disease Diagnostics: Forays into Malaria and Cancer.". In: LAM 10 International Workshop: Optics Photonics and Lasers in Science and Technology for Sustainable Development. 13-18 January 2014, Dakar, Senegal; 2014. Abstract
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Dehayem-Massop A, Angeyo HK, Kaduki KA. "Chemometrics and Machine Learning Approaches for Direct and Rapid Quantitative and Exploratory Analysis of Trace Elements by LIBS.". In: LAM 10 International Workshop: Optics Photonics and Lasers in Science and Technology for Sustainable Development. 13-18 January 2014, Dakar, Senegal; 2014. Abstract
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Gitonga L, Memeu DM, Kaduki KA, Mjomba ACK, Muriuki, N.S. "Determination of Plasmodium Parasite Life Stages and Species in Images of Thin Blood Smears Using Artificial Neural Networks." Open Journal of Clinical Diagnostics. 2014;4:78-88. Abstract
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Kaduki KA, Angeyo HK, Dehayem-Massop A. "Spectral Analysis and Imaging Platforms for Trace Analytics in Disease and Environment.". In: LAM 10 International Workshop: Optics Photonics and Lasers in Science and Technology for Sustainable Development. 13-18 January 2014, Dakar, Senegal; 2014. Abstract
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2013
Mukhono PM, Angeyo HK, Dehayem-Massop A, Kaduki KA. "Laser Induced Breakdown spectroanalysis and characterization of environmental matrices utilizing multivariate chemometrics." Spectrochimica Acta B. 2013; 87:81-85.
Memeu DM, Kaduki KA, Mjomba ACK, Muriuki NS, Gitonga L. "Detection of Plasmodium Parasites from Images of Thin Blood Smears." Open Journal of Clinical Diagnostics. 2013;3:183-194. Abstract
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Angeyo HK, Dehayem-Massop A, Kaduki. "Development of Laser Education and Research Towards Biophotonics at Nairobi.". In: 12th International conference on Education and Training in Optics and Photonics. 22; 2013. Abstract
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Kaduki KA. "The Status of Physics in Kenya.". In: 3rd International Conference on High Level Physics and Appropriate Solutions to Real Life Problems in Developing Countries. 25; 2013. Abstract
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Angeyo, H.K, Mukhono, P.M, Musyoka, D., Dehayem-Massop A, Kaduki KA. "Trace Quantitative and Exploratory Analysis by Multivariate Chemometric Laser Induced Breakdown Spectrometry Applied to Malaria and Radiogeothermic Diagnostics.". In: RIAO/OPTILAS 2013 VIII Iberoamerican Conference on Optics and XI Latin-american Meeting on Optics, Lasers and Applications. 22; 2013. Abstract
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2012
Angeyo HK, Kaduki KA, Bulimo DW, Dehayem-Massop A. "Developments in Medical Elementology and Spectral Diagnostics of Disease via Chemometrics and Machine Learning Assisted Trace Spectroanalytics and Imaging Towards Applications in Nanomedicine.". In: First Pan-African Summer School in Nanomedicine. Pretoria, South Africa; 2012.
Mukhono PM, Angeyo HK, Dehayem-Massop A, Kaduki KA. "Laser Induced Breakdown Spectroanalysis and Characterization of Environmental Matrices Utilizing Multivariate Chemometrics.". In: 7th Laser Induced Breakdown Spectroscopy Conference. Luxor, Egypt; 2012.
Omucheni DL, Angeyo HK, Kaduki KA, Bulimo WD. "Utility of Multivariate Chemometrics Techniques in Multispectral Image Analysis: An Application to Malaria Diagnostics.". In: Second African-European Conference on Chemometrics. Stellenbosch, South Africa; 2012.
Cheruiyot EK, Mito CO, Kaduki KA. "Application of Multispectral Imagery in Monitoring of Aquatic Vegetation and Water Quality Parameters in Large Inland Waters.". In: African Spectral Imaging Network (AFSIN) International Workshop on Spectral Imaging in Remote Sensing. Nairobi, Kenya; 2012.
Omucheni DL, Kaduki KA, Angeyo HK, Bulimo WD, Zoueu JT. "Application of Principal Component Analysis (PCA) to Multispectral Imaging Microscopy for Malaria Diagnosis.". In: African Spectral Imaging Network (AFSIN) International Workshop on Spectral Imaging in Remote Sensing. Nairobi, Kenya; 2012.
Memeu DM, Kaduki KA, Mjomba ACK. "Automatic Classification of Plasmodium Parasites Using Stained RGB Images.". In: African Spectral Imaging Network (AFSIN) International Workshop on Spectral Imaging in Remote Sensing. Nairobi, Kenya; 2012.
Mukhono PM, Angeyo HK, Dehayem-Massop A, Kaduki KA. "Chemometrics -Assisted Laser Induced Breakdown Spectroscopy of High Background Radiation Areas Geothermal Field Matrices.". In: African Spectral Imaging Network (AFSIN) International Workshop on Spectral Imaging in Remote Sensing. Nairobi, Kenya; 2012.
Omucheni DL, Kaduki KA, Angeyo HK, Bulimo WD, Zoueu JT. "A joint Kenya – Ivory Coast Malaria Measurement Campaign.". In: African Spectral Imaging Network (AFSIN) International Workshop on Spectral Imaging in Remote Sensing. Nairobi, Kenya; 2012.
2010
Kaduki KA, Angeyo HK, Omucheni DL, Wabwile R, Abramczyk H, Zoueu JT. "Disease diagnostics by chemometrics-assisted spectroanalytical and imaging techniques.". In: LAM9 International Workshop on Optics and Lasers in Science and Technology. Dakar, Senegal; 2010.
2004
Wangai JK, Gathoni RN, Mustapha AO, Kaduki KA. "Development of a tuneable diode laser absorption spectrometer for NO2 measurements.". In: The Seventh International Workshop on Physics and Modern Applications of Lasers. Douala, Cameroon; 2004.
2003
Kaduki KA, Ghiti A, Batty W, Allsopp DWE. "Reduced threshold current in bipolar diode lasers by non-square quantum well growth." Physica Scripta. 2003;67(1):68-73. Abstract

By device simulation, it is shown that non-square quantum well growth (well shaping) provides a means for reducing the threshold current of bipolar quantum well diode lasers. Calculations of subband structure, optical matrix elements and laser gain are performed based on a 4-band (electron, heavy-hole, light-hole, split-off-hole) Hamiltonian with Burt-Foreman Hermitianization. A non-optimized, compressively strained, InGaAs-AlGaAs (on GaAs) shaped well laser, operating at 0.97 µm is predicted to show improvements in both radiative and non-radiative current performance compared to a device based on an optimal square quantum well of the same well width and emission wavelength. These improvements result from modification of subband structure giving greater subband separation in the shaped well than in the square well

2001
Kaduki KA, Batty W. "Envelope Function Approximation (EFA) bandstructure calculations for III-V non-square stepped alloy quantum wells incorporating ultra-narrow (5 Angstrom) epitaxial layers." Physica Scripta. 2001;61(2):213-221. Abstract

We describe Envelope Function Approximation (EFA) bandstructure calculations based on a 4-band electron (EL), heavy-hole (HH), light-hole (LH) and split-off hole (SO) effective mass Hamiltonian, with Burt-Foreman hermitianisation, which can handle III-V quantum well structures that incorporate ultra-narrow epi-layers. The model takes into account the coupling of EL, HH, LH and SO bands and is suitable for describing quantum wells tuned to the 1.0 - 1.55 µm window exploited by optical fibre communication devices. We have used the multi-band solver to calculate the bandstructure of an illustrative InGaAsSb-AlGaSb non-square quantum well that incorporates 6Å potential "spikes" in its well region. Calculations based on the Burt-Foreman hermitianised Hamiltonian and those based on a Hamiltonian with standard "symmetrised" hermitianisation are presented and compared. When coupling to the conduction band is excluded from the calculation, the latter formulation leads to anomalous electron-like curvature of the dispersion curves for our spiked non-square quantum well structure

Kaduki KA. "Non-square quantum well growth for reduced threshold current in tensilely strained lasers operating at 1.52mm." African Journal of Science & Technology. 2001;2(1):11-19. Abstract

This paper presents calculations demonstrating that non-square quantum well growth
(well shaping) can result in reduced threshold current for tensilely strained quantum well bipolar
diode lasers operating at 1.52μm m. Calculations of subband structure, optical matrix elements and
laser gain are performed for arbitrarily shaped quantum wells based on a 4-band (electron/heavyhole/
light-hole/split off-hole) Hamiltonian. For long wavelength (1.3μm m to 1.55μm) lasers,
Auger recombination dominates the threshold current. Compared to a 1.52 mm optimal square well
just below critical thickness, an InGaAs-InGaAsP (on InP) well incorporating potential ‘spikes’ and
having the same wavelength can be much wider. The wider well, possible with well shaping, results
in a lower value for three-dimensional (3D) carrier density at a given value of modal gain. For low
loss lasers, this implies a reduction in Auger (and hence total) threshold current to a value below the
best obtainable in a laser based on a square quantum well

Kaduki KA. "Theoretical investigation of gain in 1.3mm GaInNAs-GaAs quantum Well diode lasers." Maseno Journal of Education, Arts and Science. 2001;3(2):160-168.
2000
1996
Kaduki KA, Ghiti A, Batty W, Allsopp DWE. Quantum well shaping for reduced threshold current in strained layer lasers.. York, U.K.: Institute of Physics; 1996.
1995
Kaduki KA, Ghiti A, Batty W, Allsopp DWE. "Laser applications of exact expressions for hole subband effective mass in arbitrarily shaped quantum wells grown along arbitrary crystal axes.". In: National Quantum Electronics Conference, QE-12 `95. Southampton, U.K.; 1995.
Batty W, Kaduki KA, Allsopp DWE. "Quantum well shaping for enhanced optoelectronic device characteristics.". In: Institute of Physics SIOE `95. Cardiff, U.K.; 1995.
Amiga KK, Kola BO. "Graphics display unit for simulation on personal computers." African Journal of Science & Technology, Series A. 1995;11(1):29-33.
Kaduki KA, Ghiti A, Batty W, Allsopp DWE. Non-square quantum well growth for reduced hole subband mass in tensilely strained lasers. Liverpool, U.K.: Institute of Physics; 1995.
1994
Kaduki KA, Batty W. Calculations of in-plane subband dispersion for non-square quantum wells. Warwick, U.K.: Institute of Physics; 1994.
1988
Amiga KK, Kola BO. Development of a computer graphics interface. Nairobi, Kenya: Kenya National Association of Physicists; 1988.

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