Technical Overview Of Biogas Utilization as Fuel of Boat Engine

The depletion of world energy reserves and the increasing levels of environmental pollution, increase human creativity. Discoveries on environmentally friendly renewable energy-making technologies are increasingly widespread. One of them is the manufacture and utilization of biogas as an alternative fuel. Biogas is one of renewable energy sources with bio gas production process from organic material like cattle dung with the help of bacteria decomposers. By conducting a literature study on biogas utilization and calculation analysis, biogas application was applied as an outboard fuel engine with 10 horse power in a boat capable of crossing for 10 minutes with a capacity of 1 to 2 passengers, such as private boats owned by coastal communities or boats used by traders on floating markets in the Kalimantan area

When a thin periodic layer meets corners: asymptotic analysis of a singular Poisson problem

The present work deals with the resolution of the Poisson equation in a bounded domain made of a thin and periodic layer of finite length placed into a homogeneous medium. We provide and justify a high order asymptotic expansion which takes into account the boundary layer effect occurring in the vicinity of the periodic layer as well as the corner singularities appearing in the neighborhood of the extremities of the layer. Our approach combines the method of matched asymptotic expansions and the method of periodic surface homogenization, and a complete justification is included in the paper or its appendix.Comment: 58 page

Performance and NOx Investigation on Diesel Engine using Cold EGR Spiral Tube: A Review

The world has the same problem to reduce emissions. Based the problem, many technologies invented to reduce the Emission. One of them is EGR (Exhaust Gas Recirculation). EGR is the most simpleNOx reduction by circulating potion of exhaust gas return into the combustion chamber. EGR system is often known by the name the hot EGR where exhaust gas circulation process without cooling system. This new Hot EGR system is designed by the addition of cooling system with air-cooled type. So that the circulating of exhaust gas to be cooled in advance in such that the mass of air increases.This research aims to study the performance and a reduction in NOX of diesel engine with EGR using addition of air cooling system. The experiments were used on diesel engine Yanmar TF 85-MHD

Analysis of Three Phases Asynchronous Slip Ring Motor Performance Feedback Type 243

Induction motor is an Alternating Current Electric Motor (AC), this motor most widely used. There are two types of rotor on three-phasess asynchronous motor, the squirrel-cage rotor and the slip ring rotor. Every motor has its own characteristic, it have been affect the used of the motor. In this research is aiming to know three-phasess asynchronous slip ring motor performance on unloaded and loaded condition. On its condition, the variation resistance starting from 0Ω - 25Ω. The results of three-phasess asynchronous slip ring motor on unloaded condition having maximum output power 58 W and maximum torque 0.22 Nm in 25Ω of resistance. While in the condition loaded having a maximum Pin 131,5 W, maximum Pout 109,31 W, maximum torque 2,08 Nm and maximum efficiency 95%. The analysis was done by knowing the relation between torque vs speed and efficiency vs load. The result shows that the increasing of motor speed have been give affect the decreasing of motor torque in according with the torque formula. In the other result, it can be seen that increasing of the load, efficiency have been increas