Judul: Mapping Distribution of Fishing Vessels and Oceanographic Conditions Based on Satellite Image Data in Madura Strait Waters, East Java
Abstrak: Penyediaan informasi zona potensial penangkapan ikan diperlukan oleh nelayan untuk meningkatkan efisiensi penangkapan ikan. Penentuan zona potensial penangkapan ikan dapat diprediksi dari data hasil olahan parameter klorofil-a, SPL dan posisi kapal ikan. Tujuan penelitian ini adalah untuk memetakan sebaran kapal penangkapan ikan hasil deteksi sensor Visible Infrared Imaging Radiometer Suite (VIIRS) serta hubungannya dengan sebaran klorofil-a dan suhu permukaan laut (SPL) di Perairan Selat Madura, Jawa Timur. Data yang digunakan adalah data deteksi kapal ikan dari sensor VIIRS. Data klorofil-a dan SPL berasal dari satelit Aqua yang dipindai oleh dari sensor Moderate Resolution Imaging Spectroradiometer (MODIS). Jumlah deteksi kapal rata-rata per hari tertinggi terjadi pada bulan Agustus (musim timur) sebanyak 50 unit sedangkan deteksi terendah sebanyak 8 unit pada bulan Desember (musim barat). Deteksi kapal tertinggi ditemukan pada tanggal 24 Agustus sebanyak 177 kapal. Deteksi pada fase bulan gelap tertinggi terjadi di bulan Maret sebanyak 139 kapal sedangkan deteksi kapal pada fase bulan terang tertinggi terjadi di bulan Oktober sebanyak 7 kapal. Hasil overlay antara posisi geografis kapal ikan dan parameter oseanografi menunjukkan kapal ikan banyak terdeteksi pada kisaran konsentrasi klorofil-a 0.3 mg/m3 sampai 0.5 mg/m3 dengan jumlah deteksi kapal berturut-turut yaitu 3191, 2599, dan 1215 unit kapal dan nilai SPL 29oC sampai 31oC dengan jumlah deteksi kapal berturut-turut sebanyak 3083, 2908, dan 2166 unit kapal., Fishermen need information on potential fishing zones to improve fishing efficiency. Determination of potential fishing zones can be predicted from the parameters of chlorophyll-a, Sea Surface Semperature (SST) and the geographical position of fishing vessels. This study aimed to map the distribution of fishing vessels detected through the Visible Infrared Imaging Radiometer Suite (VIIRS) imageries and its relationship with the distribution of chlorophyll-a and SST in the waters of Madura strait. The data was fishing vessel detection data from the VIIRS sensor. The chlorophyll-a and SST data were downloaded from the Aqua satellite from the sensor Moderate Resolution Imaging Spectroradiometer (MODIS). The highest number of ship detections per day occurred in August (east season) with 50 units, while the lowest detection was eight units in December (west season). The highest detection of vessels was founded on August 24, as many as 177 vessels. The detection of the highest dark moon phase occurred in March as many as 139 vessels, while the detection of ships in the highest bright moon phase occurred in October as many as seven vessels. The results of the overlaid technique between the position of fishing vessels and oceanographic parameters showed fishing vessels most detected in the range of chlorophyll-a concentrations of 0.3 mg/m3 to 0.5 mg/m3, with the number of vessel detections being 3191, 2599, and 1215 vessels, respectively, and SPL values of 29oC to 31oC with the number of vessel detections as many as 3083, 2908, and 2166 units of ships
Keyword: Klorofil-a, Posisi geografis kapal, Suhu Permukaan Laut, VIIRS

Judul: Distribusi Kapal Ikan dengan Lampu dan Hubungannya dengan Konsentrasi Klorofil-a dan Suhu Permukaan Laut di Laut Jawa
Abstrak: Informasi zona potensial penangkapan ikan diperlukan oleh nelayan untuk meningkatkan efisiensi usaha penangkapan ikan di perairan. Pengembangan peta zona potensial penangkapan ikan dapat dilakukan dengan mengintegrasikan data parameter oseanografi dan distribusi kapal ikan di suatu perairan menggunakan metode pengindraan jauh. Tujuan dari penelitian ini adalah untuk memetakan distribusi kapal ikan menggunakan lampu dan parameter oseanografi berupa klorofil-a dan suhu permukaan laut (SPL) di Laut Jawa pada tahun 2018. Data yang digunakan adalah data deteksi kapal dari sensor Visible Infrared Imaging Radiometer Suite (VIIRS) pada kanal Day-Night Band (Kanal DNB). Data klorofil-a dan SPL berasal dari satelit Aqua dengan sensornya yang bernama Moderate Resolution Imaging Spectroradiometer (MODIS). Jumlah rata-rata harian kapal ikan tertinggi terjadi pada bulan Agustus yaitu 1205 unit dan terendahnya terjadi pada bulan Januari yaitu 207 unit. Hasil overlay antara posisi kapal ikan dan parameter oseanografi menunjukkan bahwa distribusi kapal ikan cenderung berkumpul pada kisaran konsentrasi klorofil-a sebesar 0.2–0.4 mg/m³ dan nilai SPL sebesar 28–30°C. Kata kunci: klorofil-a, Laut Jawa, posisi kapal, suhu permukaan laut, VIIRS, Fish potential zone information is needed by fishermen to increase the efficiency of fishing business in the waters. The development of a fishing potential zone map can be done by integrating oceanographic parameter data and the distribution of fishing vessels in a sea using remote sensing methods. The purpose of this study is to map the distribution of fishing vessels using lights and oceanographic parameters in the form of chlorophyll-a and sea surface temperature (SST) in the Java Sea in 2018. The data used is ship detection data from the Visible Infrared Imaging Radiometer Suite (VIIRS) sensor. on the Day-Night Band channel (DNB Channel). Chlorophyll-a and SPL data come from the Aqua satellite with a sensor called the Moderate Resolution Imaging Spectroradiometer (MODIS). The highest daily average number of fishing vessels occurred in August, namely 1205 units and the lowest occurred in January, namely 207 units. Overlay results between fishing vessel positions and oceanographic parameters indicate that the distribution of fishing vessels tends to congregate in the chlorophyll-a concentration range of 0.2–0.4 mg/m³ and SPL values of 28–30°C. Keywords: chlorophyll-a, Java Sea, sea surface temperature, ship position, VIIRS
Keyword: chlorophyll-a, Java Sea, sea surface temperature, ship position, VIIRS

Judul: Sintesis Paduan Ti-6Al-4Nb sebagai Matrial Implan Pengganti Komponen Tibial
Abstrak: Synthesis of Ti-6Al-4Nb alloy was done by melting using Tri Arc Melting Furnace. Each sample was remelted five times to ensure the homogenity. Aluminum and niobium addition were expected to stabilize α phase and β phase until the αβ-titanium alloy was resulted. Yet based on the experiment, it was α-titanium alloy resulted. α-titanium alloy was a Hexagonal Close Packed (HCP) crystalline structure which would be cracked if deformation non-uniaxial happens. The presence of oxygen in pure titanium significantly increased the hardness of titanium. The addition of aluminum was also able to increase the hardness of titanium alloy because aluminum more stabilize the α phase in the α-titanium alloy. The corrosion ressistance of titanium could be increased by adding aluminum and niobium. Titanium coating with HA/chitosan composite was also proved in decreasing the corrosion rate because it barried direct interaction between titanium alloy and corrotion solution.
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