Saputra et al, in their writings, describe the manufacture of briquettes from the raw material of palm fronds with the Pyrolysis method added with tapioca flour adhesive. Irfan et al., in their writings, developed the design of an existing permanent magnet synchronous generator Sultan wind turbine to generate electricity at low wind speeds. conducted a study to determine the effect of installing Exhaust Gas Recirculation (EGR) on exhaust emissions of the Honda Supra X 100. Kurnia and Rahmalina, in their writings, discuss the simulation of the solar energy utilization system through a Ground Base Concentrated Solar Power (CSP) device equipped with a liquid fluid delivery system in the form of a piping system and a Stirling engine propulsion engine.

Setiawan and Upara, in their writings describe the modification of the disc friction welding machine to produce a more optimal performance for the welding results carried out with the machine. conducted a study that aims to determine the effect of current and buffer layer on the hardness value of hardfacing results using A WS A5.13 EFe2/AWS A5.1 E7018 electrodes. describes the method of analysis of cracks in the welded joint between the ASTM A106 pipe and the globe valve, namely by inspecting the installed material using OES (Optical Emission Spectroscope). Nur and Lesmana, in their writings, discuss the analysis of the influence of turbine washing on the efficiency and power of steam turbine generators, which in general aim to analyze the comparison of steam turbine performance in the form of thermal efficiency, isentropic efficiency and steam turbine power generation before and after the turbine washing process.

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