Judul: Komputasi dan Interpretasi Profil Dasar Perairan Teluk Jakarta menggunakan Instrumen Side Scan Sonar
Abstrak: Komputasi dapat digunakan untuk mendapatkan hasil kuantitatif dari Side Scan Sonar. Interpretasi profil dasar perairan menggunakan Side Scan Sonar adalah kegiatan menafsirkan citra dari Side Scan Sonar. Side Scan Sonar adalah peralatan survei kelautan yang menggunakan teknologi akustik kelautan. Penelitian ini bertujuan mengkomputasi dan menginterpretasikan profil dasar Perairan Teluk Jakarta menggunakan instrumen Side Scan Sonar. Pemrosesan data Side Scan Sonar dilakukan melalui koreksi geometrik dan radiometrik. Lokasi penelitian berada di Teluk Jakarta menggunakan CMAX CM2 (325 kHz). Hasil dari penelitian ini berupa objek yang diduga terbuat dari besi 1, besi 2, gundukan pasir dan lanau yang memiliki nilai amplitudo dan nilai hambur balik masing-masing sebesar 20224 – 32512 mV ( -4,12 dB), 21376 – 31616 mV (-3,40 dB), 10264 – 16512 mV (-4,13 dB), dan 3200 – 9984 mV (-19,78 dB). Hasil analisis karakter sinyal melalui Continuous Wavelet Transform (CWT) menunjukan energi dari setiap tektur memiliki warna berbeda. Semakin tinggi nilai amplitudo maka semakin kasar atau keras suatu target yang terdeteksi, begitu pula sebaliknya.
Keyword: Amplitudo, CWT, Interpretasi, Komputasi, Side Scan Sonar

Judul: Processing and Analysis of Seabed Acoustic Backscatter in Yos Sudarso Bay, Jayapura Using Side Scan Sonar Instrument
Abstrak: Side Scan Sonar merupakan instrumen yang digunakan untuk pencitraan dasar laut. Side Scan Sonar mampu membedakan permukaan dasar laut seperti batuan, lumpur, pasir, serta mendeteksi keberadaan pipa dan kabel laut. Penelitian ini bertujuan menginterpretasi dasar laut secara visual dan menganalisa nilai hamburbalik (dB) dengan metode Continuous Wavelet Transform (CWT) untuk mengetahui jenis substrat dasar laut. Data yang digunakan merupakan hasil pendeteksian instrumen Side Scan Sonar CMAX CM2 Towfish di perairan Teluk Yos Sudarso dengan 3 lintasan survei. Pengolahan data citra Side Scan Sonar meliputi koreksi geometrik dan koreksi radiometrik menggunakan perangkat lunak Sonarwiz 7. Koreksi geometrik meliputi bottom track dan slant range correction, serta koreksi radiometrik meliputi Beam Angle Correction (BAC), Automatic Gain Control (AGC), dan Time Varying Gain (TVG). Konversi data menggunakan perangkat lunak XtftoSegy, ekspor nilai amplitudo dengan Seisee, kemudian menampilkan hubungan amplitudo dan waktu, serta CWT menggunakan Matlab. Hasil penelitian ini diperoleh target berupa dua pasir dan satu karang. Hasil perhitungan nilai hamburbalik karang sebesar -5,0413 dB pada lintasan 6. Nilai hamburbalik pasir sebesar -15,4362 dB pada lintasan 7. Nilai hamburbalik pasir sebesar -14,2007 dB pada lintasan 8. Analisis Continuous Wavelet Transform menunjukkan target dengan tekstur keras dan kasar memiliki intensitas berwarna kuning pada scalogram, sedangkan target dengan tekstur lebih halus dan lunak memiliki intensitas berwarna biru pada scalogram., Side Scan Sonar is an instrument that is usually used to perform seabed imaging. Side Scan Sonar can distinguish seabed such as rocks, silt, sand, and detect the existence of marine pipes and cables. The aim of this research was to interpretate the seabed visually and analyze the backscatter (dB) with Continuous Wavelet Transform (CWT) for determine the type of seabed substrate. The data used from the detection of Side Scan Sonar C-Max CM2 Towfish instrument in Yos Sudarso Bay with 3 survey lines. Processing data Side Scan Sonar Image consisting of geometric corrections and radiometric corrections using Sonarwiz 7 software. Geometric corrections consist of bottom track and slant range, and radiometric corrections consist of Beam Angle Correction (BAC), Automatic Gain Control (AGC), and Time Varying Gain (TVG). Data was converted by XtftoSegy, amplitudo values were exported by Seisee, and displaying relation of amplitude and time, and CWT using Matlab. The results of this research were two sands and one coral target. The backscatter value of coral was -5,0413 dB on line 6. The backscatter value of sand was -15,4362 dB on line 7. The backscatter value of sand was -14,2007 dB on line 8. Continuous Wavelet Transform analysis shows that targets with hard and coarse textures have a yellow intensity on the scalogram, while targets with smooth and soft textures have a blue intensity on the scalogram.
Keyword: backscatter, continuous wavelet transform, side scan sonar, yos sudarso bay

Judul: Prenilasi Senyawa β-Diketon sebagai Prekursor 3-Prenilflavon
Abstrak: One group of flavonoids that has not been commonly synthesized is 3- prenylflavone. The main objective of this experiment was to synthesize precursor of 3-prenylflavone. Firstly, β-diketone was synthesized via 4 steps from phenol as starting compound with total yield of 24%. Prenylation of β-diketone with prenyl bromide and K2CO3 base produced 4 fractions which were separated by using preparative thin layer chromatography (PTLC) with n-hexane:EtOAc (8:2) as the eluent. Fraction with Rf = 0.80 was further separated by using preparative PTLC with n-hexane:EtOAc (99:1) as the eluent. Two fractions were obtained with Rf = 0.38 and 0.42. The first fraction has been characterized as diprenylated β-diketone with 49% yield. Application of protecting group on the phenolic OH group in β- diketone are needed to obtain monoprenylated β-diketone which can be further cyclized into 3-prenylflavone
Keyword: