• On the Number of Cyclic Codes Over Z31 

  Ondiany, John Joseph O.; Obogi, Robert Karieko; Mude, Lao Hussein; Monari, Fred Nyamitago (Journal of Advances in Mathematics and Computer Science, 2024-07-10)

  Let n be a positive integer, yn 􀀀 1 cyclotomic polynomial and Zq be a given finite field. In this study we determined the number of cyclic codes over Z31. First, we partitioned the cyclotomic polynomial yn 􀀀1 using cyclotomic ...
• On norms of derivations implemented by self-adjoint operators 

  Obogi, Robert Karieko (Open Journal of Mathematical Analysis, 2023-06-30)

  In this paper, we concentrate on norms of derivations implemented by self-adjoint operators. We determine the upper and lower norm estimates of derivations implemented by self-adjoint operators.The results show that the ...
• The geometry and norm-attainability of operators in operator ideals: the role of singular values and compactness 

  Mogoi, N. Evans; Obogi, Robert (Open Journal of Mathematical Analysis, 2024-12-31)

  This paper investigates the geometry and norm-attainability of operators within various operator ideals, with a particular focus on the role of singular values and compactness. We explore the behavior of norm-attainable ...
• Geometry of norm attainability in Orlicz spaces 

  Mogoi, N. Evans; Obogi, Robert (Mathematical Analysis and its Contemporary Applications, 2025)

  This paper investigates norm attainability and modular properties in Orlicz spaces, which generalize Lp-spaces and are key in functional analysis and nonlinear problems. It presents theorems on norm attainment, ...
• Certain Orthogonality Conditions for Finite Elementary Operators in Normed Spaces 

  Obogi, Robert Karieko (Functional Analysis, 2023-03-07)

  Let H be an in nite dimensional complex Hilbert space and B(H) be the space of all bounded linear operators on H. In this paper we give Certain Orthogonality Conditions for Finite Elementary Operators in Normed Spaces.
• The geometry and norm-attainability of operators in operator ideals: the role of singular values and compactness 

  Obogi, Robert (Open Journal of Mathematical Analysis, 2024)

  This paper investigates the geometry and norm-attainability of operators within various operator ideals, with a particular focus on the role of singular values and compactness. We explore the behavior of norm-attainable ...
• On norms of derivations implemented by self-adjoint operators 

  Obogi, Robert (Open Journal of Mathematical Analysis, 2023)

  In this paper, we concentrate on norms of derivations implemented by self-adjoint operators. We determine the upper and lower norm estimates of derivations implemented by self-adjoint operators.The results show that the ...
• On the Number of Cyclic Codes Over Z31 

  Obogi, Robert; Ondiany, John Joseph O; Mude, Lao Hussein; Monari, Fred Nyamitago (Journal of Advances in Mathematics and Computer Science, 2024)

  Let n be a positive integer, yn 􀀀 1 cyclotomic polynomial and Zq be a given finite field. In this study we determined the number of cyclic codes over Z31. First, we partitioned the cyclotomic polynomial yn 􀀀1 using cyclotomic ...
• Certain Orthogonality Conditions for Finite Elementary Operators in Normed Spaces 

  Obogi, Robert (Functional Analysis, 2023)

  Let H be an in nite dimensional complex Hilbert space and B(H) be the space of all bounded linear operators on H. In this paper we give Certain Orthogonality Conditions for Finite Elementary Operators in Normed Spaces.
• Geometry of norm attainability in Orlicz spaces 

  Obogi, Robert; Mogoi N, Evans (Mathematical Analysis and its Contemporary Applications, 2025)

  This paper investigates norm attainability and modular properties in Orlicz spaces, which generalize Lp-spaces and are key in functional analysis and nonlinear problems. It presents theorems on norm attainment, ...
• Spicing up nutrition: investigation of trace elements in some spices locally sold in two markets in Kisumu‑Kenya 

  Chore, Eunice; Olale, Kennedy; Mogwasi, Richard; Ogutu, Hezron (Springer, 2024)

  Spices are integral to Kenyan cuisine, adding depth of flavour and aroma to dishes. Information on the levels of macro- and micronutrients in these spices is scarce, as they are sold locally in Kisumu City, Kenya; ...
• Organochlorine pesticide residues in water and sediments in river Kibos-Nyamasaria in Kisumu County: An inlet river of Lake Victoria, Kenya 

  Ogola, Julius Ochieng; Olale, Kennedy; Mogwasi, Richard; Mainya, Obed (Elsevier, 2024)

  The misuse of organochlorine pesticides (OCPs) and the lack of adequate regulations have led to contamination of rivers and lakes. In this study, we determined the concentrations of OCPs that have either been banned or ...
• Measuring Soil Quality Indicators under Different Climate-Smart Land Uses across East African Climate-Smart Villages 

  Recha, John Walker; Olale, Kennedy; Sila, Andrew; Ambaw, Gebermedihin; Radeny, Maren; Solomon, Dawit (2022)

  The present study assessed soil physical-chemical characteristics as reliable soil health indicators in six climate-smart land use types; agroforestry, community forest, cropland with soil and water conservation (SWC), ...
• Impact of Human Activities on Water Quality in River Kibos-Nyamasaria, Kisumu County: An Inlet River to Lake Victoria in Winam Gulf, Kenya. 

  Olale, Kennedy; Ogola, Julius Ochieng; Mogwasi, Richard (International Journal of Research and Analytical Reviews (IJRAR), 2023-08)

  Human activities, Industrial, and poor agricultural practices have resulted to the contamination of rivers and lakes all over the world. Many rivers and streams in Kenya lose water quality after passing through towns and ...
• Ensemble Modeling on Near-Infrared Spectra as Rapid Tool for Assessment of Soil Health Indicators for Sustainable Food Production Systems 

  Olale, Kennedy; Recha, John Walker; Sila, Andrew; Ambaw, Gebermedihin; Radeny, Maren; Solomon, Dawit (MDPI, 2021)

  A novel total ensemble (TE) algorithm was developed and compared with random forest optimization (RFO), gradient boosted machines (GBM), partial least squares (PLS), Cubist and Bayesian additive regression tree (BART) ...
• Effects of phosphorus and potassium fertilization and fruit canopy position on sugar accumulation in mangifera indica cv. 'Kent' pulp 

  Olale, Kennedy (Journal of Food, Nutrition and Diet Science, 2024)

  Sugar content is the key to mango quality and growers are constantly seeking methods to optimize it. In this study, fructose, glucose, sucrose, and maltose sugars were evaluated to determine how phosphorus and ...
• Effect of P-K fertilizer rate and fruit canopy position on fruit quality and vitamins of Mangifera indica cv. 'Kent' 

  Olale, Kennedy (Journal of the Kenya National Commission for UNESCO, 2024)

  Mango production in Kenya is hindered by poor fruit quality and imbalanced fertilizer application, hence the need to investigate the long-term effects of different fertilizer regimes on nutrient cycling, and overall mango ...
• Effect of artificial fertilizers and pesticide use on heavy metal concentration and health risk of selected medicinal plants from Nyamira County‑Kenya 

  Mogwasi, Richard; Kenyenya, Omanga; Kenanda, Evans Okemwa; Getenga, Zachary M (2025-02)

  Medicinal plants play a significant role in treatment of both animal and human diseases especially in rural Africa. In Kenya, majority of rural population depends on the medicinal plants and their formulations for healthcare ...
• Determination of Essential Minerals in the Indigenous Vegetables Solanum nigrum (Stout Shade) and Gynandropsis gynandra (Spider Plant) from Two Agroecological Zones in Kisii County, Kenya 

  Moenga, Mercilline N; Mogwasi, Richard; Kenanda, Evans Okemwa; Olale, Kennedy (Springer, 2024-07)

  Vegetables are good sources of essential mineral elements that promote good health and immunity. Information on the nutritional contents of indigenous vegetables is scarce. Therefore, this study sought to ascertain the ...
• Comparative Study on Fatty Acids Composition of Lemna minor (Duckweed) Cultured in Indoor Plastic Tanks and Outdoor Earthen Ponds 

  Achoki, Judith; Orina, Paul; Kaingu, Catherine; Oduma, Jemima; Olale, Kennedy; Chepkirui, Mercy; Getabu, Albert (Aquaculture Research, 2024-03-04)

  Global interest in using duckweed (Lemna minor) as a substitute for fish, livestock, and human diets has spurred research on the mass culture of the species. There is a scarcity of information on the L. minor fatty acid ...

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