Judul: Rancang Bangun dan Uji Lapang Wahaha Apung Berbasis Sistem Jaringan Nirkabel.
Abstrak: Aerial Wireless Coastal Buoy merupakan wahana instrumen kelautan yang sangat diperlukan bagi pengamatan fenomena oseanografi wilayah pesisir dan pulau-pulau kecil yang menggunakan sensor-sensor untuk mengumpulkan data dan mengirimkannya melalui perantara panjang gelombang suara tertentu. Kemampuan daya wahana tersebut dalam melakukan monitoring kualitas perairan dalam waktu yang relatif lebih lama menjadi perhatian utama dalam perancangan pembuatan wahana perangkat ini. Penelitian ini berusaha untuk memperkaya wahana apung sebanyak tiga buah dan sebuah monitor menggunakan sistem pengiriman data secara nirkabel untuk mengamati parameter suhu perairan secara vertikal di daerah pesisir. Penelitian ini dilaksanakan dalam tiga tahapan penelitian yaitu prapenelitian pada bulan Juli sampai Desember 2016, Pengujian Laboratorium pada bulan Januari hingga Maret 2017 di Laboratorium Instrumentasi dan Robotika- ITK-IPB, dan Pengujian Lapangan pada bulan Mei 2017 di Pulau Pramuka, DKI Jakarta. Tahap pembuatan wahana terdiri atas desain, pekerjaan teknis pembuatan badan wahana apung, penyusunan perangkat tagar, perakitan kompartemen elektronik, dan pengujian daya apung dan transmisi data nirkabel. Wahana apung dibuat terdiri atas tiga buah dan satu penerima data di daratan (land-receiver). Tiga wahana apung tersebut dilengkapi dengan enam sensor yang terpasang secara vertikal pada masing-masingnya yang berfungsi untuk merekam dan mengirimkan data suhu vertikal perairan ke stasiun penerima data di daratan melalui protokol ZigBee. Ketiga wahana apung memiliki kestabilan yang baik baik pada pengujian statis maupun dinamis. Setiap wahana apung memiliki bobot maksimum seberat 27 kg tanpa beban dan 35 kg dengan muatan kompartemen dan tiang antena. Hasil pengujian lapang menujukkan data hasil rekaman sensor tersimpan dengan baik pada wahana apung (logging system) dan mampu mengirimkan datanya ke penerima di daratan (wireless system). Wahana apung yang dirancang ini telah mampu menunjukkan kinerjanya dalam memberikan gambaran perubahan fluktuasi kondisi suhu perairan yaitu sebesar 28-310C selama ujicoba wahana di lapangan.
Keyword: instrumen, wahana apung, suhu, XBee, jaringan sistem nirkabel, Pulau Pramuka

Judul: Design, construction and sea trial of buoy system using A-WSN ZigBee protocol for in coastal waters
Abstrak: Ocean observation has become a challenge due to it's vast and rough condition. Limited access and unpredictable weather makes the ocean observation require a good plan. Understanding about the sea and its phenomenon is a key factor for many fields including climatology, fisheries, port management, coastal management, national resilience, public health institution, environmental assessment, and oil and gas company. Coastal ecosystem consisting of estuary, mangrove and seagrass are the ecosystem which has high primary productivity and many ecological functions. Each component in coastal ecosystem is closely related. Human activity put stress on this environment and makes it very fragile. Mooring buoy has been used as one of the options to monitor ocean autonomously. In this study, the instruments and telemetry system are installed in a specially designed buoy for automatic sampling. Mooring buoy has succeed in global climate study, for example is TAO/TRITON bouy. However the big dimension in the existing buoy system is not suitable for coastal ecosystem monitoring. Energy efficient system in Aerial Wireless Sensor Network (A-WSN) is applicable for coastal ecosystem monitoring buoy system. A small-size instrument, low cost, and durable can become ideal solution for a mooring buoy system, and also has advantage in term of spatial and temporal resolution. This research aim is to develop six mooring buoy instrument based on A-WSN ZigBee protocol for monitoring sea surface temperature. The design and construction of buoy platform has shown good stability both in static and dynamic test. The remaining 6 kg carrying capacity of the buoy is available from total 23 kg buoyancy for additional instrument. A-WSN performance shows 100% successful in data transmitting for static test. Dynamic test shows good performance with 100% success ratio for R1, 99.91% for R2, 84.94% for E1, 99.57% for E2, and 100% for E3. Power consumption analysis has been done for battery endurance test. The results are 39.7 hours for coordinator, 39.8 hours for router, and 87.8 hours for end device. The sea trial of the buoy shown a good performance for sea surface temperature monitoring in Panggang Island, Seribu Islands
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Judul: Genistein and Daidzein Content of Soybean, Tofu Waste, and “Oncom Merah”.
Abstrak: Isoflavone (genistein and daidzein) can be found in Leguminosae, especially in soybean. Soybean can be processed into tofu and get around to tofu waste, which can be processed finally to “oncom merah”. Soybean, tofu waste, and “oncom merah” had been analysed in this research for genistein and daidzein contents. Soybean, tofu waste, and “oncom merah” were hydrolysed using 4 N HCl and ethanol, followed by partition using ethyl acetate. Components purification by flash chromatography and its contents were determined by high performance liquid chromatography. Genistein and daidzein contents of soybean were 128.69 mg/100g and 134.46 mg/100g, respectively. Tofu waste contained 65.93 mg/100g genistein and 63.68 mg/100g daidzein. Furthermore, genistein and daidzein contents of “oncom merah” were 32.41 mg/100g and 27.70 mg/100g. Soybean contained genistein and daidzein two times higher than tofu waste and four times higher than “oncom merah”.
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