Judul: Pengaruh Konsentrasi Adsorben dan Waktu Bleaching pada Pemurnian Minyak Ikan Nila (Oreochromis sp.)
Abstrak: Tilapia fish oil (Oreochromis sp.) which is produced by the home industry from fish fillet waste is still in the form of crude oil which has low quality so it needs to be purified. Fish oil extraction was carried out using the wet rendering method, then proceeded to the purification stage using neutralization and bleaching. The purpose of this study was to determine the best concentration of magnesol XL adsorbent and the length of time for adsorption in the bleaching process for refining tilapia oil (Oreochromis sp.) to produce fish oil according to the International Fish Oil Standard (IFOS). The oxidation parameters of tilapia crude oil were not in accordance with IFOS with free fatty acids 5.52%, acid number 10.62 mg KOH/g, peroxide number 17.31 mEq/kg, anisidin number 11.23 mEq/kg, and total oxidation 45.86 mEq/kg. The oxidation parameters of pure tilapia fish oil in the best treatment, namely the addition of 3% adsorbent and a bleaching time of 15 minutes had a free fatty acid value of 1.31%, an acid number of 2.6 mg KOH/g, a peroxide value of 4.3 mEq/kg, an acid number of 4.3 mEq/kg anisidin 7.63 mEq/kg, and total oxidation 16.23 mEq/kg., Minyak ikan nila (Oreochromis sp.) yang diproduksi oleh industri rumah tangga dari limbah fillet ikan masih berupa minyak kasar yang memiliki kualitas rendah sehingga perlu dilakukan pemurnian. Ekstraksi minyak ikan dilakukan menggunakan metode wet rendering, kemudian dilanjutkan ke tahap pemurnian menggunakan netralisasi dan bleaching. Tujuan penelitian ini adalah menentukan konsentrasi terbaik adsorben magnesol XL dan lama waktu adsorpsi pada proses bleaching pemurnian minyak ikan nila (Oreochromis sp.) hingga menghasilkan minyak ikan yang sesuai standar International Fish Oil Standard (IFOS). Parameter oksidasi minyak kasar ikan nila belum sesuai IFOS dengan asam lemak bebas 5.52%, bilangan asam 10.62 mg KOH/g, bilangan peroksida 17.31 mEq/kg, bilangan anisidin 11.23 mEq/kg, dan total oksidasi 45.86 mEq/kg. Parameter oksidasi minyak ikan nila murni pada perlakuan terbaik yaitu penambahan adsorben 3% dan waktu bleaching selama 15 menit memiliki nilai asam lemak bebas 1.31%, bilangan asam 2.6 mg KOH/g, bilangan peroksida 4.3 mEq/kg, bilangan anisidin 7.63 mEq/kg, dan total oksidasi 16.23 mEq/kg.
Keyword: adsorbent, IFOS, fish oil, purification

Judul: Pengaruh Pemurnian terhadap Kualitas Minyak Ikan Nila (Oreochromis sp.) Hasil Samping Fillet Ikan dari Medan, Sumatera Utara
Abstrak: PT Aquafarma Nusantara di Medan, Sumatera Utara merupakan perusahaan yang mengolah hasil samping fillet ikan nila menjadi minyak ikan. Penelitian ini bertujuan menentukan karakteristik dan pengaruh pemurnian terhadap kualitas minyak ikan nila. Minyak kasar ikan nila memiliki warna kuning tua. Parameter oksidasi minyak kasar ikan nila belum sesuai International Fish Oil Standar (IFOS) dengan asam lemak bebas 7,78±0,04%, bilangan asam 17,02±0,85 mg KOH/kg, bilangan peroksida 26,69±0,16 meq/kg, bilangan p-anisidin 11,25±0,59 meq/kg, total oksidasi 64,65±1,25 dan kejernihan 58,27±0,15%. Minyak ikan nila murni memiliki warna kuning muda. Parameter oksidasi minyak ikan nila murni yaitu nilai asam lemak bebas 0,85±0,16%, bilangan asam 1,84±0,37 mg KOH/kg, bilangan peroksida 16,82±0,54 meq/kg, p-anisidin 7,29±0,07 meq/kg, total oksidasi 40,94±1,01 meq/kg dan kejernihan 68,63±0,58 %. Bilangan peroksida dan total oksidasi minyak ikan nila murni masih belum memenuhi standar IFOS. Minyak kasar dan minyak murni ikan nila didominasi oleh asam lemak tidak jenuh tunggal.
Keyword: ikan nila, kualitas, minyak ikan

Judul: Sistem Informasi Geografis untuk Pola Aktivitas Manusia dengan Pemodelan Data Spatio-Temporal
Abstrak: The human activity in a given time period will shape its pattern. This research develops a spatiotemporal data model to support the prediction of human existence based on activity-pattern and also visualizes the activity locations in a GIS environment. This so-called mobility oriented spatiotemporal data model conceptualizes the spatial and temporal interaction of activity behaviour using the concept of mobility. In other words, activity patterns are conceptualized as a sequence of staying at or traveling between activity locations. The model can support the analysis and queries of activities from different perspectives, i.e. queries can be time-oriented, person-oriented, activity-oriented, and location-oriented. A prototype system based on the activity data modelling is implemented in MySQL 5.0.27 as DBMS with using PhpMyAdmin 2.9.1.1 software. Spatial database is developed with using software QuantumGIS and ArcView. The system could be accessed online through a web browser with MySQL as its database storage and Pmapper framework as the tools used in visualizing the activity locations.The information were provided in the form of activity attribute-data as the user requested and graphical-data (map) which contains information about its activity locations.
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