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The 54th volume of "International Journal of Engineering Research in Africa" includes peer-reviewed manuscripts that present the research results in the fields of materials science and processing technologies, applied and fluid flow mechanics, mechanical engineering, environmental engineering, construction and building materials, engineering management, and logistics.
The collected scientific articles can be appreciated by most engineers, academic teachers, and students majoring in engineering science.

The 69th volume of the journal includes articles dedicated to the latest research results in properties and processing technologies of structural materials such as steel, polymers, and composites, analysis and design of sliding mode controllers and automation of centrifugal pumps, designing of geothermal heat exchangers, investigation of seismic behaviour of soil-based structure and analysis mechanics of river's sediments transfer in conditions of Wadi Skhirate, Morocco.
Polymer, Composite, Steel, Kevlar, Mechanical Properties, Structural Metal, Aluminium, Molecular Dynamics Simulation, Microstructure, Computational Materials Science, Corrosion Resistance, Welding, Sliding Mode Control, Set Point Tracking, Soil Cohesion, Seismic Behaviour, Structural Mechanics, Geothermal Heat Exchanger, Thermal Properties, Heat Transfer, Centrifugal Pump, Automation, Daylighting System, Sediment Transport, River Management, Coarse Sediment

Key Engineering Materials, 748 KEM, 166–170. https://doi.org/10.4028/www.scientific.net/KEM.748.166 [10] John Wiley & Sons. (2013).
Pande, “Multiphase flow analysis of hydrodynamic journal bearing using CFD coupled Fluid Structure Interaction considering cavitation,” Journal of King Saud University - Engineering Sciences, vol. 30, no. 4, pp. 345–354, Oct. 2018, doi: 10.1016/j.jksues.2016.09.001
Mohd Sabri, “Experimental and Numerical Investigation of Static and Dynamic Characteristics of Bio-Oils and SAE40 in Fluid Film Journal Bearing,” Materials, vol. 15, no. 10, p. 3595, May 2022, doi: 10.3390/ma15103595
Lubrication Phospholipid Polymer Grafted Highly Cross-Linked UHMWPE 20.1.2 Articular Cartilage and Materials for Designing Artificial Joints
International Journal of Computational and Experimental Science and Engineering. 5. 31-36. 10.22399/ijcesen.492548.

2D Simulation of the Aerodynamic Micro Air Journal Bearing for Micro Gas Turbine Engine Zhaoqi Zeng1,3a, Yukui Wang*1,2b,and Zhenlong Wang1,3c 1School of Mechanical Engineering, Harbin Institute of Technology, Harbin, P.R.China, 150001 2School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, P.R.China 3Key Laboratory of Micro-systems and Micro-structures Manufacturing (Harbin Institute of Technology)，Ministry of Education，Harbin, China, 150001 azzq986@163.com, *bwangyukui@hit.edu.cn, cwangzl@hit.edu.cn Keywords: micro air journal bearing; micro gas turbine engine; aerodynamic; simulation.
The cross section of the air journal bearing is shown in Fig. 3.
So the clearance of 15µm is suitable for this air journal bearing.
So the gear number of 12 is not suitable for this air journal bearing.
Acknowledgments This research work is funded by Natural Science Foundation in China (No.50835002), Natural Science Foundation of Heilongjiang Province in China (No.E200901) and the Fundamental Research Funds for the Central Universities (No.HIT.KLOF.2010010).

We are glad to present to our readers the 37th volume of International Journal of Engineering Research in Africa.
This volume contains articles describing the research results in the fields of materials science, mechanical engineering, power distribution, construction materials and technologies, technological processes in the chemical production and environmental engineering, network engineering and supply chain.
The articles will be useful for many engineers as well as for academic teachers and students majoring in these fields of engineering science.

This process was economical to cut complex products and difficult-to-machine materials.
Unlike traditional cutting and grinding processes, which rely on the force generated by a harder tool or abrasive material to remove the softer work-material, WEDM is a thermoelectric process that erodes workpiece material by a series of discrete electrical sparks between the workpiece and electrode flushed by or immersed in dielectric fluid.
The hardness and strength of the difficult-to-machine materials are no longer the dominating factors that hinder the machining process [2].
Acknowledgments: This research work is funded by Natural Science Foundation in China (No.50835002), Natural Science Foundation in China (No.51105111) and the Fundamental Research Funds for the Central Universities (No.HIT.KLOF.2010010).
Journal of Manufacturing Science and Engineering.

So, the working temperature of lubricating oil at oil outlet is expressed as ρp s i c pG tt )1( + += (4) Finite Element Model of Hybrid Journal Bearing Material Properties of Bearing.
The material properties of the bearing (Fig.1) are shown in Table 1.
Table 1 Material properties of hybrid journal bearing Material Properties CuPb5Sn5Zn5 Steel 45 Density [kg/m 3] 8800 7850 Thermal conductivity [W/m·℃] 398 50.2 Specific heat [J/kg·℃] 343 460 Geometrical Model.
Acknowledgments This research was supported by the Science and Technology Foundation of Liaoning Province of China under granted No. 20072030 and the National Science and Technology Major Project of China under granted No. 2009ZX04014-014.
Gao: Advanced Materials Research Vols. 69-70 (2009) pp 296-30 [2] X.

The proposed function allows extension theory in the areas of materials science and engineering science with a broader scope.
Introduction Recently, extension theory founded by Professor Cai Wen, a Chinese scholar, has been applied in many fields such as machinery, manufacturing, materials and automation [1-5].
The dependent function can enlarge the application in many fields such as materials science and engineering science.
Journal of Beijing University of Chemical Technology (Natural Science), Vol. 37 (3) (2010), p. 87-91 (in Chinese)
Journal of Harbin Institute of Technology, Vol. 38(7) (2006), p. 1079-1087 (in Chinese)

This volume of the journal "Advanced Materials Research" is collected from peer-reviewed stand-alone papers describing the results of research and engineering solutions dealing with actual problems in the area of materials science and materials processing technologies.
Shape Memory Alloy, Friction Materials, Direct Metal Laser Sintering, Micro-Wire Electro-Discharge Machining, Wood, Concrete, Fibre Reinforced Concrete

Characteristics of the Straight Fluted Journal Bearing Profile Fig.1 Cross section of the water-lubricated rubber journal bearing Fig. 2 Geometry local graph of the water-lubricated rubber journal bearing The water-lubricated rubber journal bearing is a multi-wedge-shape-gap flutes bearing.
The special bearing profile is decided by its material and work properties and has great advantages: It is easy to form water films because the transitions between water grooves and load curve are soft arc curves.
Fig.4 Schematic diagram of a cylindrical journal bearing ( F: force; ω: rotational speed; Φ: attitude angle; θ: circumferential coordinate; e: eccentricity; O: center of the bearing bush; Oj: center of the journal; R: radius of the bearing bush; r: radius of the journal).
Here, the effects of the material and the multi-disciplinary coupling are ignored and the only thing to be done is to show the importance of the shape function.
Effect of surface physicochemical properties on the lubricating properties of water film, Applied surface science,” vol. 254, P:7137-7142,2008 [2] D.L.Cabrera, N.H.