DSpace 9

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DSpace is the world leading open source repository platform that enables organisations to:

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Now showing 1 - 5 of 13

Recent Submissions

Numerical Investigation of Turbulent Fluid Flow Over a Porous Aerofoil Wing Design Within a Magnetic Field
(International Advanced Research Journal in Science, Engineering and Technology, 2025-10) Kirui G. K; Mukuna W. O; Oduor M. O
A mathematical model of turbulent fluid flow over a porous aerofoil wing design within a magnetic field is considered. The fluid flow was modelled using Navier stokes equations of conservation of momentum, energy and mass in cylindrical coordinates. The governing equations were then non-dimentionalized and gave rise to the non-dimensional parameters. Computational fluid dynamics (CFD) techniques was used to simulate the flow of air over a porous wing within a range of magnetic field strengths. Examinations of the effects of the magnetic field on key performance metrics such as lift, drag, and efficiency, as well as the overall flow structure of the wing was performed and found valuable insights into the use of porous aerofoil wings in the design of aircraft operating in high-magnetic field environments, such as those found in space or near the Earth's poles. Additionally, the outcomes of the research had wider implications for other domains investigating the impact of magnetic fields on fluid motion, such as in the design of magnetic resonance imaging systems or in the study of planetary motions. Aerofoil wings are an essential component of aircraft design, as they provide lift and enable flight. However, the flow of air over the wing is often turbulent, which can lead to decreased efficiency and performance. Porous aerofoil wings wasproposed as a means of reducing turbulence, and the effects of such wings on fluid flow within a magnetic field have been thoroughly investigated. In this research, numerical investigation of the effects of a magnetic field on turbulent fluid flow over a porous aerofoil wing design was done. It is evident from the results that the primary velocities increase when the magnetic parameter was reduced. It was also found that the lift force increases when the Grashof number and Prandtl number decreases.
Numerical Investigation of Turbulent Fluid Flow Over a Porous Aerofoil Wing Design Within a Magnetic Field
(UoK, 2025-10) Gideon Kimutai Kirui
Aerofoil wings are an essential component of aircraft design, as they provide lift and enable flight. However, the flow of air over the wing is often turbulent, which can lead to decreased efficiency and performance. Porous aerofoil wings was proposed as a means of reducing turbulence, and the effects of such wings on fluid flow within a magnetic field have been investigated. A mathematical model of turbulent fluid flow over a porous aerofoil wing design within a magnetic field M=0.1 to M=2 was considered. The fluid flow was modeled using Navier Stokes equations for the conservation of momentum, energy and mass in cylindrical coordinates. The governing equations were then non-dimensionalized by the non- dimensional flow parameters such as magnetic parameter(𝑀), Hall parameter(𝑚), Prandtl number(𝑃𝑟), and Grashof number (𝐺𝑟) on fluid velocity and temperature distribution and gave rise to the nondimensional parameters. Computational fluid dynamics (CFD) techniques were used to simulate the flow of air over a porous wing within a magnetic field strength. Examination of the effects of the magnetic field on key performance metrics such as lift, drag, and efficiency, as well as the overall flow structure of the wing was performed and found valuable insights into the use of porous aerofoil wings in the design of aircraft operating in high-magnetic field environments, such as those found in space or near the Earth's poles. Additionally, the outcomes of the research had wider implications for other domains investigating the impact of magnetic fields on fluid motion, such as in the design of magnetic resonance imaging systems or in the study of planetary motions. In this research, numerical investigation of the effects of a magnetic field on turbulent fluid flow over a porous aerofoil wing design was done. Variation of Prandtl number (from Pr = 0.7 to 3) significantly varied the temperature profile while it had no observable effect on the velocity profiles. It is evident from the results that the primary velocities increase when the magnetic parameter was reduced. It was also found that the lift force increase when the Grashof number and Prandtl number was decreased.
Nuclear Proliferation: A Cross-Cutting International Security Issue
(International Journal of Advanced Multidisciplinary Research and Studies, 2025-03-07) Michael Ang’anyo Onyango; Thomas Otieno Juma
This paper discusses nuclear proliferation as a cross-cutting international security issues in contemporary. The paper addresses four pertinent themes which include: The nature of nuclear weapons and their effects; the global diffusion of nuclear and ballistic missile technology; Theorizing nuclear proliferation and non-proliferation, and; Other weapons of mass destruction (WMD) and their impact on world politics. Whereas nuclear itself is very useful commercially, we argue that nuclear weapons represent mankind’s ultimate confrontation with the natural environment that sustains us. The purpose of these weapons is wholesale destruction on a massive scale, which affects most forms of life. It stands as a single human creation with such a great potential for harm. Such is the threat to life posed by nuclear weapons that the International Court of Justice, the world’s highest legal authority, in its 1996 landmark ruling on the general illegality of these weapons, stated: "The destructive power of nuclear weapons is hard to be contained. They have the potential to destroy all civilization and the entire ecosystem of the planet.” There are two overwhelming threats to life on earth as we know it. They are climate change and its security effects. The diffusion of nuclear weapons to additional countries might come about through indigenous development programs, through assistance from the present nuclear powers, or through a combination of both. This diffusion, sometimes called the "Nth country" problem, has been of great concern in discussions of disarmament and U.S. nuclear assistance programs. It has been widely held that the spread of nuclear capabilities is disadvantageous for U.S. security and that an effort to stop it should receive highest priority in disarmament policies. It is the purpose of this presentation to examine the validity of this proposition. To do so it will be necessary to estimate the political and military effects that might arise from a further diffusion of nuclear capabilities. Such an undertaking is necessarily fraught with great uncertainties. This paper also presents an analysis of the contemporary debate on the begging question, “is there a theory of nuclear proliferation?” The theoretical debate over how nuclear proliferation should be explained, and whether future nuclear proliferation can be predicted or not, has been given fresh impetus since the end of the Cold War. The debate has been particularly lively, as the new international environment has brought new challenges to conventional wisdom about the spread of nuclear weapons. However, although some very important contributions have been made, the dynamics of nuclear proliferation remain largely a mystery. This paper does not claim to have found the answers, but it does attempt to show the limitations of the existing debate, and in doing so, highlights areas which require further research. Finally the paper interrogates the questions; “With the rapid erosion of the prohibition on use by states of chemical weapons, and the rise of radical non-state groups seemingly willing to utilize whatever weapons of mass destruction they can obtain, what can the international community do to restrain their use? And what do advances in neuroscience portend for the development and use of new kinds of chemical control agents?”
Working Hours, Work-Family Conflict and Mental Health of National Police Service Officers in Southrift, Kenya
(International Journal of Social Sciences and Management Review, 2025-10-05) Benjamin Bett Cheruiyot; Williter Rop; Lucy Jumah
The study examined the relationship between employee working hours, work-family conflict and mental health of Kenya National Police Service officers in South Rift, Kenya. The study was motivated by the rising mental health cases of Kenya National Police Service officers. The study adopted correlational and cross-sectional research design. A sample size of 384 respondents were selected from a target population of 13,230 using multi-stage sampling technique and simple random technique. Data was collected using a structured questionnaire and analyzed using both descriptive and inferential statistics. A pilot study was conducted on the data collection instrument to pre-test its validity before the main survey, while data reliability was measured using Cronbach's Alpha coefficient. The study showed significant negative associations between working hours and mental health of Kenya National Police officers. Moreover, work-family conflict significantly moderated the link between working hours and mental health. The study concludes that addressing mental health requires reduction of employee working hours. Given the findings, the study recommends adoption of flexible duty rosters and rotational shifts that would enable police officers to balance professional obligations with personal and family needs. Furthermore, family-inclusive counseling is essential to mitigate conflict spillovers.
Relationship Between the Credit Risk Assessment and The Financial Performance of Tier-Two and Tier-Three Commercial Banks in Kenya
(East African Journal of Business and Economics, 2025-09-10) Cheboss Venus Jeptoo; Penina Langat; Raymond Kemboi
This study examined the relationship between credit risk assessment and the financial performance of tier-two and three commercial banks in Kenya. The research adopted a cross-sectional design targeting 312 top-level employees from 30 tier-two and tier-three banks, with a sample size of 175 respondents selected through simple random sampling. Data were collected using structured questionnaires and analysed using descriptive and inferential statistics. The results showed that while credit risk assessment practices were generally in place, the correlation with financial performance was positive but statistically insignificant (r = 0.057, p > 0.05). This indicates that although credit risk assessment is important, it alone may not significantly influence financial performance unless combined with other credit risk management strategies. The findings suggest that banks should not rely solely on assessment but enhance other practices for improved financial outcomes.