Judul: Deteksi Keberadaan Gunung Bawah Laut (Seamount) Dan Dimensinya Menggunakan Echosounder Multibeam di Perairan Bengkulu.
Abstrak: The research Detection of the Seamount Existence and Measuring Dimensions by Using Multibeam Echosounder in Bengkulu’s Seas was conducted during 5 months from Maret until July 2012. The aim from this research is to guess the existence of seamount and measuring dimension such as height, diameters, and number of peaks. There are two acoustic instruments used in this research, consisted of : ELAC Seabeam 1050D with a frequency of 50 kHz and Simrad EM 12D with a frequency of 12 kHz. Bathymetric survey conducted in southwest Sumatera island on 18-19 December 2010. Data acquisition was obtained by using the hydrostar software in Baruna Jaya III and Baruna Jaya IV vessel. CARIS HIPS and SIPS 6.1 used to get data of bathymetry. Amplitude and backscatter data obtained by processing on the MB System. Visualization of data is performed by using the Fladermaus 6.2 software thus obtained in 3D. Seamount is assumed as a cone with an elliptical base to calculate the dimensions. The result from this research is existence of an object that is allegedly as a seamount at 320 Kilometers from the southwest of Bengkulu city, precisely at 4022’9,16’’ southern latitude and 990 25’ 01,47’’ east longitude. The seamount height is ± 3.968 meters and has two peak separated by a gap called a caldera at ± 3.050 meters. The major axis is ± 50.240 meters and the minor axis in this seamount is ± 5.644 meters. Seamount peaks located at ± 1.270 meters below sea level. Based on the opinion of some geologists, the seamount is expressed as an inactive volcano
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Judul: Pengukuran Hambur Balik Akustik Dasar Laut di Sekitar Kepulauan Seribu Menggunakan Split Beam Echosounder.
Abstrak: The purpose of this research is to compute the backscattering strength of the seabed by measuring volume backscattering strength (SV), bottom surface backscattering strength (SS), and the echo level (EL) from seabed using split beam echosounder. The research was conducted from 29th January to 3rd February 2011, around the Seribu Islands: Pramuka island, Panggang island, Karya island and Semak Daun island, North Jakarta. Acquisition of acoustic data was conducted using the SIMRAD EY 60 instrument. Acoustic data obtained from 9 stations simultaneously with sediment sampling. Acoustic processing data was conducted by Rick Towler program with Matlab based. The SV and SS were analyzed Manik et al, model by using. Sediment sampling station consisted of 9 stations: Pramuka island there are 1 station (Station 1), Karya island there are 2 stations (Station 2, and Station 3), Panggang island there are 3 stations (Station 4, Station 7, Station 9), and Semak Daun island there are 3 stations (Station 5, Station 6, Station 8). Sediment classified based on the sediment texture. Seabed surface sediments were separated into 3 types, they are: sand, mud, and clay. This analysis showed that the location of the 9 stations observation is dominated by sand fraction with the percentage of 80.85%. Mud and clay fractions had the average percentage value of 18.32% and 0.83%, respectively. The backscattering value (SV) of sand substrate ranged -10.62 to -18.51 dB with the average of -13.91 dB, and the muddy sand substrate ranged from -16.58 to -25.42 dB with the average -20.57 dB. The value of SS for the sand substrate ranged from -20.70 to -28.58 dB with the average value of -23.98 dB. Muddy sand substrate has a value of SS in the range of -26.64 to -35.49 dB with the average SS of -30.64 dB, from this research, the classification of seabed type using hydroacoustic technology was possible.
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Judul: Pengaruh Media Tanam Dan Pupuk NPK Terhadap Produksi Tanaman Pak-Choi (Brassica Chinensis) Varietas Green Pak-Choi
Abstrak: Pak-choi merupakan salah satu jenis sayuran daun sumber vitamin, mineral, dan kaya akan serat sehingga dapat membantu memperiancar pencemaan serta dapat mencegah kanker. Pak-choi dapat dibudidayakaan di rumah kaca atau di lapangan terbuka Syarat media tanam pak-choi adalah beraerasi baik, gembur. subur, dapat rnengikat air, dantidak menggnang. Pupuk yang diberikan merupakan pupuk NPK dalam bentuk butiran supaya tidak mudah terurai oleh air penyiraman dan ketersediaannya kontinyu selama musim tanam.
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