Earthquake-prone Zonation of North Bengkulu Based on Peak Ground Acceleration of Katayama’s and Kanai’s Formula

We have done mapped earthquake-prone zonation of North Bengkulu, Indonesia, based on peak ground acceleration by kanai's and Katayama's formula. Twenty nine microtremor data have recorded by Digital portable Seismometer that installed in North Bengkulu regency. The result of HVSR analysis, we got resonance frequency and A0 which explained the condition of surface rocks. Peak ground acceleration on rock surface which applied local geology condition (dominant period of natural soil vibration). Based on A0 value, the risk of earthquakes in north Bengkulu was on moderate to high level because this area has relatively soft rock structure. Kanai's formula has correlation near 70.6% with Katayama's formula to showed PGA value on rock surface. Peak Ground acceleration of Kanai formula in North Bengkulu about 152,441 - 674,391 gal and based on Katayama formula between 35.2 gal until 51.3 gal. Based on PGA value, we estimated that North Bengkulu has on IV and IX of MMI scales. It meant that in North Bengkulu potential have heavy damage when an earthquake occurred. Distribution of PGA values based on the observation has correspond to effects earthquake of North Bengkulu at September 2007

Simulasi Kontrol Temperatur Berbasis Fuzzy Logic untuk Tabung Sampel Minyak Bumi pada Metode Direct Subsurface Sampling

Telah dilakukan simulasi kontrol temperatur untuk model tabung pengambilan sampel minyak bumi pada metode Direct Subsurface Sampling menggunakan Fuzzy Logic Control (FLC). Temperatur tabung sampel dikontrol agar selalu stabil pada temperatur 50oC. Simulasi didesain menggunakan toolbox fuzzy logic dan matlab simulink. Hasil simulasi menggunakan FLC menunjukkan kestabilan kontrol yang lebih baik bila dibandingkan dengan hasil simulasi kontrol menggunakan metode control PID dan kontrol on/off. Simulasi kontrol menggunakan FLC diperoleh nilai error sebesar 1,153 oC dan settling time sebesar 0,5 s. Simulasi kontrol metode PID diperoleh nilai error sebesar 3,127 oC dengan settling time 4 s, sedangkan simulasi kontrol on-off diperoleh error sebesar 4,248 oC dengan settling time 4 s

Penerapan Pompa tanpa Listrik (Heron's Fountain) untuk Hidroponik DFT (Deep Flow Technique) di Kelurahan Sukamerindu Kecamatan Sungai Serut Kota Bengkulu

THE APPLICATION OF NON-ELECTRIC PUMP (HERON'S FOUNTAIN) FOR DFT HYDROPONIC (DEEP FLOW TECHNIQUE) IN SUKAMERINDU, SUNGAI SERUT, BENGKULU CITY. Science and technology-based community engagement about the application of non-electric pump (Heron's Fountain) for DFT hydroponics (Deep Flow Technique) have been carried out for mother group (respondent) in Sukamerindu, Sungai Serut, Bengkulu City. The aim of this activity is to apply the Appropriate Technology like hydroponics and Heron's Fountain pumps. The methods of this activities are carried out by training which include socialization and field practice. This program produces 5 hydroponics which are equipped with Heron's Fountain pumps and brief guidebook about of technologies. The application of the Heron's Fountain pump for DFT hydroponics was effective in circulating nutrients for hydroponic plants. The Heron's Fountain pump works temporarily for 45 minutes (10 liters). It was considered sufficient to circulate nutrients for hydroponic plants as evidenced by the same quality for all plants. All plants grow optimally and more yields than initial estimates. The planting period to harvest using hydroponic technology and the Heron's Fountain pump is quite short, which is approximately 2.5 months. The use of these two technologies helps partners to start farming without using soil media. The cost of making and operating both systems so as to increase the interest of respondent to implement them independently