The finite element method is one method used in the structural and nonstructural analysis. This paper aims to the simulated of the finite element method on nonstructural problems namely heat transfer. The media used has been a motorcycle exhaust system modeled with COMSOL Multiphysics 5.4 software by combining annealed stainless steel 405 with 35% chrome stainless steel, Beta-21S Titanium, and Carbon II type as a large tube on the exhaust model. The results of computing simulation obtained are that the lowest heat transfer value in Carbon II material type with a heat transfer rate of 325 K.

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The heart is a very vital organ. There are two main states in the heartbeat cycle, systole and diastole. The heartbeat system studied in this paper was taken from a study of Thanom and Loh in 2011. This paper is aimed to analyze the stability of the heartbeat system using Lyapunov’s Direct Method. This method requires a Lyapunov function. To construct the Lyapunov function, the Gradient Variable Method will be used. In this research, the Lyapunov function constructed V ( x ) = x 1 2 + x 2 2 , V ˙ ( x ) > 0 is obtained. This means V ˙ ( x ) is said to be a positive definite and the equilibrium point (0,0) of the heartbeat system is unstable.

In the world of education now learning methods do not only use conventional methods such as from textbooks and teacher explanations, but also with effective and efficient learning methods using information technology. An example is multimedia-based learning media. Community service is one way that can be used to carry out information technology socialization. The community service that will be carried out in this study is entitled Easy and Interesting Mathematics Learning Through Animation. For elementary school students, with the aim of helping students in the learning process of mathematics that is more interesting interactive and fun, because in general lower elementary school students view mathematics lessons are difficult and boring learning. In this service, a learning media for mathematics will be created that includes the problem of building and space in accordance with the existing curriculum. Learning applications that are built include material, training, and tests, in accordance with applicable competency standards. Furthermore, training will be given to several elementary schools, as a briefing on how to use this learning system application so as to increase student motivation and ultimately improve student achievement and improve education quality.

The flow of water in the river is one of shallow water flow that has many benefits. One of them is as a power plant that uses a water wheel. Where the water wheel is used utilizing the flow of water in the river. The flow of water in the river in this study has a speed of 1.2 m/s. In the completion of this research, the finite element method in numerical approach is used to analyse the velocity of fluid motion in the river. Where speed inflow can affect electricity production. In the process, this research uses simulation with a software that works based on finite element method that is COMSOL Multiphysics 5.2 in two-dimensional form. The simulations are performed in two-dimensional flow, all the particles are thought to flow in the plane along the flow so that no flow is perpendicular to the plane. The simulation is carried out for 10 seconds and based on three variations of the water wheel height based on the center point of the water wheel is 1 m, 1.25 m and 1.5 m. Of the three variations, the fastest speed is at 1 m with maximum discharge is 34.6 m/s