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Abstrak - Solar cell adalah perangkat yang dapat mengubah energi sinar matahari menjadi energi listrik. Namun dalam penerapannya, sebagian besar solar cell ditempatkan secara statis sehingga dalam penyerapan cahaya matahari tidak mendapatkan cahaya dan daya yang optimal. Untuk mengoptimalkannya, perlu ditambahkan perangkat mekanis yang dapat menggerakkan sel surya. Dalam penelitian ini, menggunakan Arduino Uno R3, sensor cahaya LDR dengan output pergerakan motor servo. Lalu menggunakan metode 2 DOF, solar cell dapat diposisikan baik secara vertikal maupun horizontal. Tujuan dari penelitian ini adalah untuk merancang Solar Cell Tracking System dengan Lux Meter Berbasis Arduino Uno R3 dapat bergerak mengikuti cahaya matahari dan untuk mengukur nilai cahaya matahari yang jatuh pada solar cell dengan menggunakan sensor BH1750. Berdasarkan hasil pengujian menunjukkan solar cell tracker dapat bergerak dengan matahari dan mendapatkan selisih nilai yang ditandai dengan peningkatan tegangan, arus, daya dan lux. Dan pada pengujian tegangan dengan persentase kenaikan nilai sebesar 2,24%. Pada pengujian arus dengan persentase peningkatan nilai sebesar 12,06%. Pada pengujian daya dengan persentase peningkatan nilai sebesar 18,18%. Dan pada pengujian lux dengan persentase peningkatan nilai sebesar 6,15%.   Kata Kunci: Arduino Uno, LDR, Motor Servo, Solar Cell, BH175

Bahan yang paling umum digunakan dalam membuat basis gigi tiruan adalah resin akrilik polimerisasi panas. Bahan tersebut memiliki kelemahan berupa kemampuan menyerap air yang menyebabkan berkurangnya kekuatan transversal sehingga basis mudah fraktur. Penggunaan bahan pelapis misalnya edible coating dari kitosan dapat menghambat penyerapan air pada basis gigi tiruan. Tujuan penelitian adalah menganalisis pengaruh pelapisan kitosan pada basis gigi tiruan resin akrilik polimerisasi panas terhadap penyerapan air dan kekuatan transversal. Metode: Jenis penelitian eksperimental laboratoris. Sampel yang digunakan adalah 16 buah resin akrilik polimerisasi panas berukuran 65x10x2,5mm dibagi 2 kelompok menjadi 8 sampel untuk setiap kelompok. Kelompok A tanpa dilapisi kitosan, kelompok B dilapisi kitosan. Sampel didesikasi hingga mencapai berat konstan kemudian direndam ke dalam akuades selama 7 hari lalu ditimbang, dicatat kemudian di desikasi ulang hingga berat konstan. Penyerapan air dihitung menggunakan rumus Oysaed dan Ruyter dan kekuatan transversal diuji menggunakan Universal Testing Machine. Hasil data dianalisis dengan uji t-independen. Hasil: Terdapat pengaruh signifikan pelapisan kitosan terhadap nilai penyerapan air p=0,001 dan kekuatan transversal p=0,032 (p<0,05). Nilai penyerapan air kelompok A sebesar 16,26 ± 0,25 µg/mm 3 dan kelompok B sebesar 15,72 ± 0,28 µg/mm 3 ). Nilai kekuatan transversal kelompok A sebesar 96,02 ± 5,01 MPa dan kelompok B sebesar 102,10 ± 5,17 MPa. Simpulan: Pelapisan kitosan berpengaruh terhadap penyerapan air dan kekuatan transversal basis gigi tiruan resin akrilik polimerisasi panas. Pelapisan kitosan dapat mencegah penyerapan air dan mencegah penurunan kekuatan transversal resin akrilik polimerisasi panas.Kata kunci: Basis gigi tiruan, resin akrilik polimerisasi panas, kitosan, penyerapan air, kekuatan transversal. The effect of chitosan coating on the water absorption and transverse strength of heat polymerised acrylic resinABSTRACT Introduction: The most common material used for denture base is hot polymerised acrylic resin. This material has a weakness in the ability to absorb water which causes reduced transverse strength, thus prone to fracture. Coating materials such as edible coating from chitosan can inhibit water absorption in the denture base. This study was aimed to analyse the effect of chitosan coating on the water absorption and transverse strength of heat polymerised acrylic resin. Methods: This research was an experimental laboratory. The samples used were 16 heat polymerised acrylic resins measured 65x10x2.5mm divided into two groups, eight samples for each group. Group A was not coated with chitosan, and group B was coated with chitosan. The sample was desiccated until it reached a constant weight, immersed in distilled water for seven days, weighed, recorded, and re-desiccated until the weight was constant. Water absorption was calculated using the Oysaed and Ruyter formula, while the transverse strength was tested using the Universal Testing Machine. The results...

The livelihoods of most residents in Lebak district are rainfed rice farming, gardening, in addition to raising goats. Many of the plantation commodities that generate income for the villagers in Lebak Regency include plantation products such as rubber, oil palm, cocoa, robusta coffee, sugar palm, cloves, coconut, hybrid coconut, pepper, pandan, tea, cashew nuts, vanilla, jatropha, jatropha, and Kapok. In addition, the difficulty of transportation in some areas of Lebak Regency makes it difficult for farmers to market their products. Electricity in Lebak is supplied by PLN continuously, but there are still some areas that have not been touched by electricity at all, so the residents still rely on oil lamps as a means of lighting at night. Phone and GPRS signal is still difficult. This condition is what causes the marketing of products produced by farmers or MSME actors is still marketed in their respective regions and even the barter process is still going on (exchanging goods). During the Covid-19 Pandemic, Slow Food MSME actors experienced a decline in sales due to a decline in people's purchasing power which was the effect of the covid-19 pandemic. From some of these problems, community service will provide training and socialization of the use of information technology, namely by providing knowledge on the use of Facebook social media as a means of marketing MSME products, with the aim that Slow Food MSME business actors can continue to market their products and increase people's purchasing power towards Slow Food MSME products. It is hoped that after participating in the training and socialization, Slow Food MSME business actors have an online buying and selling account through Facebook that is easy, effective, and safe so that they can increase product marketing not only in their own region, but also on a national and international scale.

The events of the covid-19 pandemic produce an uncertain future. This has a very far-reaching influence on capitalization of capitalization and also social problems such as increasing levels of violence and crime rates. The purpose of this study is to analyze government policies regarding reactions due to inflation, especially in Indonesia. Inflation rate has a negative effect on the reaction load. The inflation rate affects the response because when the stimulus increases, inflation will decrease and vice versa. There are several government policies in overcoming pressure due to inflation, namely creating jobs, changing the investment climate, spreading several economic stimulus, and improving the quality of human resources through education.