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), ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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. ...
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 ...
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), ...
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 ...
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 ...
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 ...
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 ...
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 ...