There are three types of paddy leaf disease that have similar symptoms, making it difficult for farmers to identify them, namely Blast Disease, Brown-Spot Disease, and Narrow Brown-Spot Disease. This paper aims to develop an application to identify paddy leaf disease automatically. Several important aspects of the development of software engineering such as usability, interactivity, and simplicity have been considered. Image processing techniques, namely Blobs analysis and color segmentation are used to get the characteristics of diseased leaf; these characteristics are then used to identify the type of diseases using a rule-based expert system. The results obtained indicate that the developed system recognition capability is considered satisfactory with an accuracy of 94.7%.

Reliability of the electric power system and fulfil the certification of sustainable industries in the palm oil industry are offered by utilizing the potential of renewable energy sources as power plants. This research is aimed to analyze the technical and economic aspects of the Solar PV-Biogas power plant at PT. TBS. The method used in this research is hybrid parallel with the off grid network system. In manual calculations showed an optimal generating system consisting of an anaerobic digester with a lagoon capacity of 28,934.81 m3, 1,560 kW biogas generator, 4,040.22 kWp PV array, 2000 kW bidirectional inverter, and 10,125 units of batteries with capacity of 1,547Ah. Then the system is evaluated using HOMER Pro software with project lifetime of 20 years, and the total electricity production obtained during the life of the project is able to supply loads continuously with an average excess electricity about 25.23%/years of total production. Meanwhile, in the economic analysis of hybrid power plants require an initial investment (NPC) of Rp.233,553,169,589.30, with total CO2 emissions of POME 44,073.75 tons/year, then the cost of Certified Emission Reduction is obtained about Rp.6,611,062,500/year. The calculation of economic feasibility results in a Net Present Value of Rp.136.266.578.753, Payback Period of 13,8 years, and an Internal Rate of Return of 9,41%. Based on the result of techno-economic analysis in the research, it can be concluded that this hybrid generating system has the potential to be developed for study that is more detailed if it is to be implemented.Keywords: HOMER Pro, Off-grid, PT. TBS, Solar PV/Biogas, Techno-economic.

Magnetic generator is a synchronous generator that uses permanent magnets to generate magnetic flux. In its manufacture, to increase the power, voltage and speed of a permanent magnet generator, simply change parameters such as magnetic flux, number of turns, number of turns, number of magnets and wire diameter. To design or analyze permanent magnet generators,used software is MagNet 7.5to simulate it. This magnet software is based on the Finite Element Method or commonly called FEM. FEM is a computational method that has the concept of breaking the calculation area into small parts and then calculating the parameters one by one in each part. In this study, the variables to be simulated are the number of turns on the stator coil with a variation of 10, 50, and 75 turns. This study uses a combination of 18 slots 16 poles with NdFeB magnets. Then the generator is tested using a 20 ohm load. From the simulation, it can be seen that the number of turns affects the voltage and power generated, where when the generator is given a 20 ohm load with 10, 50, and 75 turns it produces a voltage of 22.3 volts, 88.9 volts and 103.7 volts then for power it produces 61.2 watts, 547 watts and 756.2 watts. Keyword -Coil, MagNet 7.5, Power, Voltage Abstrak -Generator magnet merupakan generator sinkron yang menggunakan magnet permanen untuk menghasilkan fluks magnetik. Dalam pembuatannya, untuk meningkatkan daya, tegangan dan kecepatan pada generator magnet permanen, hanya dengan mengubah parameter seperti fluks magnet, jumlah lilitan, jumlah belitan, jumlah magnet serta ukuran diameter kawat. Untuk merancang atau menganalisa generator magnet permanen, digunakan software MagNet 7.5 untuk mensimulasikannya. Software magnet ini bersifat Finite Element Method atau biasa disebut FEM. FEM merupakan metode komputasi yang memiliki konsep memecah area hitungan menjadi bagian kecil lalu dihitung parameternya satu per satu ditiap bagian. Dalam penelitian ini, variabel yang akan disimulasikan adalah jumlah lilitan pada kumparan stator dengan variasi 10, 50, dan 75 lilitan. Penelitian ini menggunakan kombinasi 18 slot 16 pole dengan jenis magnet NdFeB. Kemudian generator diuji menggunakan beban 20 ohm. Dari simulasi dapat diketahui bahwa jumlah lilitan berpengaruh terhadap tegangan dan daya yang dihasilkan, dimana ketika generator diberi beban 20

In this paper, a new approach for supplying water to shrimp production ponds in Purworejo, Indonesia, is proposed. The paper covers the design of a solar-powered DC water pump system (SWPS), system performance analysis, and economic analysis by comparing it with the existing fossil-fuel-powered pumps. The mathematical approach for the designing process is shown and Lorents Compass alternative tool is introduced. By taking into consideration the daily water demand of 50 m3/day, the annual-averaged local solar irradiation of 4.7 kWh/m2 per day, and the available components in the market, an SWPS in Purworejo would comprise a 1200 Wp PV panel and a 600 W DC pump submerged in a borehole in the seashore. The SWPS would be able to meet the daily water demand with small seasonal variations. The financial analysis shows high feasibility to install SWPS in Purworejo with a 1,6 years simple payback period, which is very short. The SWPS would provide more than 20 years of free energy for the farmers to draw seawater to the pond each day when the sun shines. It can provide not only environmental and social benefits but also significant economic advantages, both at the farm and the national levels.