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Now showing items 1-16 of 16

Kinetic Study of the Thermal Decomposition for Mixed Municipal Solid Waste Using Thermogravimetric Analysis

Nzioka, Antony Mutua; Alunda, Benard Ouma (Periodicals of Engineering and Natural Scinces, 2017-11)

Thermal conversion of wastes is one of theperspectivesolution to ‘municipal solid waste’ problem. Thermal conversion process entails thermal decomposition of material with an increase in temperature. This experimental ...
Experimental study of bubble behaviors and CHF on printed circuit board (PCB) in saturated pool water at various inclination angles

Elvira F. Tanjung; Bernard O. Alunda; Yong Joong Lee; Daeseong Jo (Nuclear Engineering and Technology, 2018)

Experiments were performed to investigate bubble behaviors and pool boiling Critical Heat Flux (CHF) on a thin flat rectangular copper heater fabricated on Printed Circuit Board (PCB), at various inclinationangles. The ...
A simple way to higher speed atomic force microscopy by retrofitting with a novel high-speed flexure-guided scanner

Bernard Ouma Alunda; Yong Joong Lee; Soyeun Park (Japanese Journal of Applied Physics, 2018-05-08)

A typical line-scan rate for a commercial atomic force microscope (AFM) is about 1 Hz. At such a rate, more than four minutes of scanning time is required to obtain an image of 256 ' 256 pixels. Despite control electronics ...
Crosslinking Effect on Thermal Conductivity of Electrospun Poly(acrylic acid) Nanofibers

Yeongcheol Park; Suyeong Lee; Sung Soo Ha; Bernard Alunda; Do Young Noh; Yong Joong Lee; Sangwon Kim (MDPI, 2019-05-10)

The thermal conductivity (k) of poly(acrylic acid) (PAA) nanofibers, which were electrospun at various electrospinning voltages, was measured using suspended microdevices. While the thermal conductivities of the as-spun ...
Investigating the performance of square ring under uniform squeeze rate and internal pressure

B.O. Alunda; D.O. Agumba; I.O. Ondicho; L.O. Otieno; M. Chepkoech; N.A. Mutua; J.S. Hawong (Materialwiss. Werkstofftech., 2020)

Transportation and controlling fluid flow under high pressures in pumps, valves, boilers and heat exchangers is a common exercise in the industries. The main challenge, however that has confronted designers and manufacturers ...
Implementation of a Sinusoidal Raster Scan for High-Speed Atomic Force Microscopy

Luke, Oduor Otieno; Yong, Joong Lee; Bernard, Ouma Alunda (Journal of the Korean Physical Society, 2020)

To improve the speed of an atomic force microscope (AFM), one must improve the bandwidth of its components, and the lateral XY scanner is no exception. Sinusoidal raster scans provide a simple way of improving lateral ...
Revealing a Transformation‑Induced Plasticity (TRIP) Phenomenon in a Medium‑Entropy Alloy

Ibrahim Ondicho; Bernard Alunda; Dicken Owino; Luke Otieno; Melody Chepkoech (The Chinese Society for Metals, 2020)

A transformation-induced plasticity phenomenon in Fe65(CoCrMnNi)35 medium-entropy alloy was investigated. According to the X-ray diffraction patterns, the as-cast specimen contains a single-phase face-centered cubic (fcc), ...
Revealing a Transformation‑Induced Plasticity (TRIP) Phenomenon in a Medium‑Entropy Alloy

Ibrahim, Ondicho; Bernard, Alunda (Acta Metallurgica Sinica, 2020-05)

A transformation-induced plasticity phenomenon in Fe65(CoCrMnNi)35 medium-entropy alloy was investigated. According to the X-ray difraction patterns, the as-cast specimen contains a single-phase face-centered cubic (fcc), ...
Review: Cantilever-Based Sensors for High Speed Atomic Force Microscopy

Bernard Ouma Alunda; Yong Joong Lee (MDPI, 2020-08-25)

This review critically summarizes the recent advances of the microcantilever-based force sensors for atomic force microscope (AFM) applications. They are one the most common mechanical spring–mass systems and are extremely ...
Effect of Fe on the Hall-Petch relationship of (CoCrMnNi)100-x Fex medium-and high-entropy alloys

Ibrahim, Ondicho; Bernard, Alunda; Nokeun, Park (Intermetallics, 2021)

In the present study, a systematic investigation on the effect of Fe content on the Hall-Petch coefficient of (CoCrMnNi)100-x Fex (x =20, 40, 50, and 60) medium- and high-entropy alloys (M/HEAs) was carried out. The ...
Design and Fabrication of a High-Speed Atomic Force Microscope Scan-Head

Luke, Oduor Otieno; Bernard, Ouma Alunda; Jaehyun, Kim; Yong, Joong Lee (Sensors, 2021)

A high-speed atomic force microscope (HS-AFM) requires a specialized set of hardware and software and therefore improving video-rate HS-AFMs for general applications is an ongoing process. To improve the imaging rate of ...
Effect of Fe on the Hall-Petch relationship of (CoCrMnNi)100-x Fex medium-and high-entropy alloys

Ibrahim Ondicho; Bernard Alunda; Nokeun Park (Intermetallics, 2021)

In the present study, a systematic investigation on the effect of Fe content on the Hall-Petch coefficient of (CoCrMnNi)100-x Fex (x = 20, 40, 50, and 60) medium- and high-entropy alloys (M/HEAs) was carried out. The ...
Prediction of rock fragmentation using the Kuznetsov-Cunningham-Ouchterlony model

E.K. Mutinda; B.O. Alunda; D.K. Maina; R.M. Kasomo (The Journal of the Southern African Institute of Mining and Metallurgy, 2021-03)

Assessment of blast fragment size distribution is critical in mining operations because it is the initial step towards mineral extraction. Different empirical models and techniques are available for predicting and investigating ...
MAPPING AND CHARACTERIZATION OF SOLID IRON ORE MINING WASTES IN KISHUSHE AREA, TAITA TAVETA COUNTY, KENYA

FRANCIS, GITAU (Taita Taveta University, 2022)

Solid mine waste management is a continuous and systematic assessment of the potential hazards, disposal, and proper utilization of waste produced in a mining company during the mining and mineral processing stages. In ...
OPTIMISATION OF SHOVEL-TRUCK HAULAGE SYSTEM IN AN OPEN-PIT USING QUEUING APPROACH

KAUNGU, ELIJAH MUNYAMBU (2022)

Equipment selection is key activity in mining operation because it accounts to more than 60% of total operation cost. When selection of equipment is not properly done it results into over- trucking or under-trucking. ...
EVALUATION OF IN-PIT CRUSHING AND CONVEYING (IPCC) SYSTEMS PRODUCTIVITY IN OPEN PIT MINES

DICKSON, MURAGE WACHIRA (Taita Taveta University, 2022)

Haulage of materials in Open-pit mines contributes to approximately 40%-60% of the total operational costs. Current stricter environmental conditions, an increase in depths and size of open-pit mines, an increase in ...

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