Abstract Designing foundations, particularly highway pavements, on black cotton soil has consistently posed a delinquent for engineers, as structures supported by this type of black cotton soil are prone to unexpected cracking and settlement. The issue this study aims to solve is the lack of appropriate performance materials for use as road subgrade in regions with black cotton soil. This study aims to inspect if a mixture of silica sand and lime can be used to advance the mechanical propert...
Abstract In this research, comparative investigation of the effect of selected natural polymers with the chemically synthesis imported polymer on threaded assemblies was carried out. The investigation involved the extraction of rubber and cashew resin using the continuous tapping method and ackee aril resin by the soxhlet extraction method, respectively. Stabilization of resin density, pH and viscosity was carried out by the addition of ZnO in different weight percentage of 3, 5, 7, and 10% ...
ABSTRACT The use of solar energy through photovoltaic systems has seen rapid growth in recent years due to its environmental benefits and cost-effectiveness. However, one of the main challenges that PV systems face is the accumulation of dust and debris on solar panels, which can significantly reduce their efficiency. To address this problem, we propose the design and development of a solar cell cleaning robot. This project aims to create an autonomous robot capable of cleaning solar panels e...
Remote areas that are not within the maximum breakeven grid extension distance limit will not be economical or feasible for grid connections to provide electrical power to the community (remote area). An integrated autonomous sustainable energy system is a feasible option. We worked on a novel multi optimization electrical energy assessment/power management system of a microgrid network that adopted combined dispatch, load-following, and cycle-charging strategies (control system) that acted a...
COVID-19 outbreak has rapidly disseminated across the globe, with severe consequences on humanity. Personal protective polymeric materials (PPPM) or personal protective equipments (PPE) are effective barrier protection against bodily fluid penetration and is compulsory for medical personnel to wear during medication of highly contagious COVID-19 patients in varying hospital wards across the globe to ensure protection against contraction. Nanotechnology (NT) advancements in textiles have avail...
2-D nanomaterials (NM) including graphene as well as transitional metallic dichalcogenides exhibit great prospects to enlarge the scope of materials utilized by the military. Specifically, they demonstrate importance in electrical energy storage uses. Due to sheet-like architectures and elevated electronic dissipation, 2-D NM can utilize efficient techniques of energy storage for defense applications. Emerging from medium (vehicles) towards miniature electronic sizes, gadgets such as batterie...
Abstract/Overview Tea, produced from the evergreen plant, Camellia Sinensis, is the most widely consumed beverage in the world after water. Although tea processing has now diversified into various speciality end products such as instant, white, oolong, iced, flavoured, and various blends, the most abundantly produced tea product in the world is fermented black tea. Black tea production is essentially a “dry” process, as no water is used at any of the production process steps. However ...
Abstract The element of risk taking in entrepreneurial orientation reflects calculated and manageable risks. Risk taking is a dominant attribute of entrepreneurship as the higher the risk-taking orientation, the higher a firm’s profitability and growth. This purpose of this paper was to establish the influence of entrepreneurial risk taking and firm performance of agro processing small and medium enterprises in Kenya. The study findings revealed that risk taking has a positive impact on fi...
Abstract The evaluation of research and indeed any aspect of science and engineering is a complex process. Engineering research encompasses a wide range of creative, theoretical and practical activities involving many communities within a country and beyond. Such diversity, both in the communities of interest that science and engineering serves, and in the character of the research itself, poses a number of challenges to the assessment of excellence. All those responsible for the funding of ...
Abstract In semi-arid regions, climate change has affected crop growing season length and sowing time, potentially causing low yield of the rainfed staple crop pearl millet (Pennisetum glaucum L.) and food insecurity among smallholder farmers. In this study, we used 1994–2023 rainfall data from Namibia’s semi-arid North-Central Region (NCR), receiving November–April summer rainfall, to analyze rainfall patterns and trends and their implications on the growing season to propose climate ...
Abstract Groundwater contamination by chlorinated hydrocarbons (CHC) is a common phenomenon that poses health risks to both humans and animals. These halogenated hydrocarbons infiltrate into the soil matrices and form pools at the bottoms of the aquifers thus contaminating the groundwater sources. Thermally enhanced soil vapour extraction (TSVE) using steam–air injection has gained popularity as an alternative technique to remediate the saturated and vadose source zones contaminated with C...
Abstract River Nzoia originates from three water towers namely Nandi hills, Cherengany Hills and Mount Elgon. With increased anthropogenic activities in Nzoia river catchments, land cover has continuously been altered. This scenario has resulted into increased quantity of physical parameters in runoff among them, sediment load and turbidity, during rainy season. This study modelled effects of increased land use changes on runoff and sediment loads. Digital Elevation Model, spatial soil data,...
Abstract Studies have shown that perovskites have a high potential of outdoing silicon based solar cells in terms of solar energy conversion, but their rate of degradation is also high. This study reports on improvement on the stability of CH3NH3PbI3 by passivating it with polymethylmethacrylate (PMMA). Structural and electronic properties of CH3NH3PbI3 stabilized by polymethylmethacrylate (PMMA) were investigated by varying concentrations of PMMA in the polymer solutions. Stability tests we...
Abstract This paper presents a finite element simulation of equal channel angular pressing (ECAP) since it is one of the most common and successful severe plastic deformation techniques. This study reports the influence of the most significant factors influencing the ECAP technique. Through finite element simulation, the effect of the die geometry, workpiece geometry, and the pressing speed on the effective strain distributions, damage, and pressing loads, were investigated. The influence of...
Abstract Rainwater harvesting (RWH) is emerging as a promising alternative source of water in sub-Saharan Africa. It can be an alternative source of good-quality water to substitute other freshwater sources, to enable crop production beyond the growing season through supplemental irrigation as well as to improve the environment by minimizing the effect of drought and floods. The Rachuonyo North Sub-County of Kenya experiences low rainfall coupled with high population with limited access to r...