This research examines the production process of making Minangkabau wind instrument, Bansi, produced by Hamdan Thawil. This research began by observing the stages of making Bansi, then about production factors that affect the production process. The results of this study include; 1) the selection and processing of raw materials, 2) the use of tools, 3) the manufacturing phase of Bansi and the factors of production; 1) natural resource factor, 2) human resource factor, 3) capital resource factor and 4) expertise/ skill factor. The research was conducted with a case study approach and using qualitative methods. Data collection techniques were carried out using participatory observation, interviews, documentation, and triangulation. Organologi Bansi: Alat Musik Tiup Minangkabau Produksi Hamdan Thawil di Padangpanjang. Penelitian ini mengkaji proses produksi pembuatan alat musik tiup Minangkabau, Bansi, produksi Hamdan Thawil. Penelitian ini dimulai dengan mengamati tahapan pembuatan bansi, kemudian tentang faktor-faktor produksi yang mempengaruhi proses produksi. Hasil penelitian ini meliputi; 1) pemilihan dan pengolahan bahan baku, 2) penggunaan alat, 3) tahap pembuatan bansi dan faktor produksi; 1) faktor sumber daya alam, 2) faktor sumber daya manusia, 3) faktor sumber daya permodalan dan 4) faktor keahlian/keterampilan. Penelitian dilakukan dengan pendekatan studi kasus dan menggunakan metode kualitatif. Teknik pengumpulan data dilakukan dengan observasi partisipatif, wawancara, dokumentasi, dan triangulasi.
Geothermal energy source is one of the wealth of mineral resources that are being widely used. Geothermal Power Plant is a solution to the needs of New Renewable Energy to overcome energy needs and dependence on renewable energy. However, there were important problems that occurred in the geothermal field, namely the formation of silica scaling in the production pipe causing the brine injection process to be disrupted, the injection process aims to maintain the volume of the geothermal reservoir and maintain the quantity of production steam in the long run. Therefore, controlling silica in the brine injection path in geothermal fields is very much needed. This paper discussed the decrease in silica mass influenced by pH and the addition of Sodium Lignosulfonate (SLS) surfactants that studying the changes in pH (7, 8 and 9), and surfactant concentrations (0.05, 0.15 and 0.30% (w/v)). The results showed that the dissolved silica in the geothermal solution was reduced and could be controlled by the addition of SLS surfactants. The greater the surfactant concentration and pH, the more the mass of silica will be taken. The best conditions are at pH 9 and SLS surfactant concentration 0.30%w/v.
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