Judul: Pengembangan Perangkat Lunak Antarmuka Instrumen Motiwali (Tide Gauge) untuk Analisis Data Pasang Surut
Abstrak: MOTIWALI is a water level instrument based on acoustic that has been created at the Marine Instrumentation Laboratory of ITK-IPB. The data recording need detail analyze by a program to detemine constituent of tide characteristicc. The objective this study is developing interface program (software) for tidal analisys with Admiralty methode. This Admiralty-based method program computes 9 tidal constituents, determines Formzahl tidal types, and predicts tidal time-series for particular time-length. The Matlab-based program scripts consist of four modules: the pre-processing module for parsing, filtering and data averaging; the Admiralty module for tidal constituents analysis, the Formzahl module for tidal types determination; and prediction module for tidal prediction. The 15-day sea-surface elevation time series data from Pramuka Island - Seribu Islands Jakarta have been used to examine the performance of the software. The result shows that the amplitude and phase difference obtained from this software and Dishidros tidal table (also with least-squared t-tide method) was very small (RMSE: 1.89 cm and 102°). This means that accuracy of calculation are quite consistent. Furthermore, diurnal tidal type (Formzahl number, F=4.43) obtained from this analysis was in good agreement with previous studies. Tidal prediction module provides beneficial information for marine activities around the region.
Keyword: Seribu Islands Jakarta, tidal constituents, Admiralty method, interface software, MOTIWAL

Judul: Tidal chart and tidal propagation pattern in the Indonesian Seas
Abstrak: Understanding of the tidal phenomenon could support in management of resources. Since the tidal pattern is different for each region, it needs to be presented in an informative media like tidal chart, showing an information co-tide, corange, and tidal type contours. This study aims to investigate tidal wave propagation, distribution of major tidal harmonic constants, and areas that have the same tidal type Indonesia waters. The major tidal harmonic constants data (M2, S2, N2, K2, K1, O1, were obtained from Indonesian Naval Hydrographic Office (Dishidros TNI AL). method used to interpolate values of major tidal harmonic constants is spline interpolation. Software implemented to create contour is terramodel. The results that the semidiurnal tidal wave propagate mainly from the Indian Ocean into Indonesian seas through Malacca Strait, Sunda Strait, Lombok Strait, Sawu Arafura Sea. Contours of tidal constants in shallow waters are more tightly that in the deep waters, from Natuna Sea to Bangka Belitung waters there exists types: diurnal, mixed tide prevailling diurnal, mixed tide prevailling semidiurnal, and semidiurnal. However, in general tidal type in Indonesia waters is dominated by mixed prevailling semidiurnal, because it is situated between the Indian and Pacific where mixed tide prevailing semidiurnal type is dominant.
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Judul: Sintesis Flavon dari Fenol dan Benzoil Klorida
Abstrak: Flavone is a class of flavonoid, commonly found in plants with wide bioactivity spectrum. A widely used flavone synthesis route is through acidcatalyzed oxidative cyclization of β-diketone. In this study, unsubstituted flavone had been synthesized via 5-step from phenol, with 22% yield and successfully increased the yield of previous study on Fries rearrangement of phenyl acetate and benzoylation of o-HAP steps. Phenol was acetylated resulting 93% phenyl acetate. AlCl3-catalyzed Fries rearrangement in 1.5 hour and at 120 °C converted phenyl acetate into o-hydroxyacetophenone (o-HAP) with 40% yield. AlCl3 as catalyst produced o-HAP with higher and reproducible yield compared with BF3·Et2O and ZnCl2. Benzoylation of o-HAP followed by Baker-Venkataraman rearrangement of the ester product using KOH in dried pyridine produced β-diketone 1-(2- hydroxyphenyl)-3-phenylpropane-1,3-dione. The yield of ester and β-diketone were 71% and 85%, respectively. Finally, oxidative cyclization of β-diketone with sulphuric acid as catalyst produced 99% of flavone. The flavone product had been characterized spectroscopically and its melting point as well.
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