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: Deteksi Kapal Perikanan Menggunakan Sensor VIIRS dan MODIS di Perairan Utara Madura
Abstrak: Perairan Utara Madura merupakan bagian dari Laut Jawa yang termasuk Wilayah Pengelolaan Perikanan Negara Republik Indonesia (WPPNRI) nomor 712 memiliki aktivitas perikanan tangkap yang cukup tinggi sehingga perlu dilakukan pemantauan demi pengelolaan sumberdaya yang berkelanjutan. Penelitian ini bertujuan untuk memetakan sebaran kapal perikanan melalui hasil deteksi citra Visible Infrared Imaging Radiometer Suite (VIIRS) serta hubungannya dengan sebaran klorofil-a dan suhu permukaan laut di Perairan Utara Madura. Data VIIRS Boat Detection (VBD) yang disortir berdasarkan nilai quality of flag (QF) sama dengan 1 digunakan untuk mendeteksi sebaran kapal penangkap ikan. Data satelit Aqua dengan sensor Moderate Resolution Imaging Spectrometer (MODIS) digunakan untuk menganalisis sebaran konsentrasi klorofil-a dan suhu permukaan laut. Hasil deteksi kapal perikanan lampu menggunakan sensor VIIRS secara temporal menunjukkan adanya fluktuasi jumlah kapal yang melakukan aktivitas penangkapan di Perairan Utara Madura. Deteksi kapal terendah terjadi pada bulan Desember yaitu sebanyak 148 deteksi sedangkan deteksi kapal tertinggi terjadi pada bulan Juli yaitu sebanyak 1799 deteksi. Deteksi jumlah kapal juga dipengaruhi oleh fase bulan, kapal perikanan yang beraktivitas pada saat bulan gelap lebih banyak daripada saat bulan terang pada setiap musimnya. Distribusi kapal perikanan umumnya terdeteksi pada perairan dengan kisaran konsentrasi klorofil-a 0.2 - 0.4 mg/m3 dan nilai SPL sebesar 30.4 – 30.6 ℃., The northern part of Madura waters, which are part of the Java Sea and included in WPPNRI-712 have high fishing activities. Therefore, fishing monitoring is necessary for sustainable resource management. The study aimed to map the distribution of fishing vessels detected through the VIIRS imageries and its relationship with the distribution of chlorophyll-a and sea surface temperature (SST) in the waters of North Madura. VIIRS Boat Detection (VBD) data sorted by type QF1 was used to detect the distribution of fishing vessels. Aqua MODIS satellite data was used to analyze the distribution of chlorophyll-a concentration and SST. The results of detection of light fishing vessels using VIIRS sensors temporally showed fluctuations in the number of vessels carrying out fishing activities in the Northern Waters of Madura. The lowest vessel detection occurred in December with 148 vessels while the highest occurred in July with 1799 vessels. Amount detection of fishing vessels was also influenced by the lunar phase. There were more fishing vessels detected during the new moon than during the full moon in each season. The distribution of fishing vessels was generally detected in waters with a chlorophyll-a concentration range of 0.2 to 0.4 mg/m3 and an SST value of 30.4 to 30.6 ℃.C.
Keyword: Boat detection, chlorophyll-a, MODIS, sea surface temperature, 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.
Keyword: