Judul: Sebaran Spasial dan Temporal Genangan Banjir Rob di Kota Pekalongan menggunakan Citra Satelit Landsat 8 OLI
Abstrak: Banjir rob merupakan suatu fenomena yang disebabkan oleh pasang surut yang menggenang daratan dengan ketinggian elevasi lebih rendah dari perairan. Salah satu daerah yang terdampak fenomena ini adalah Kota Pekalongan. Teknologi penginderaan jauh secara efektif dapat digunakan untuk mengetahui sebaran spasial dan temporal genangan banjir rob Kota Pekalongan dari tahun 2014 hingga 2018. Sebaran banjir rob didapatkan dari ekstraksi data daratan dan lautan yang disesuaikan dengan data ketinggian elevasi muka tanah Kota Pekalongan dan faktor penyebabnya. Hasil analisis menujukan bahwa setiap tahun terjadi perubahan luasan genangan banjir rob. Pada tahun 2014 seluas 957.47 hektar atau 20.63 % dari total luas Kota Pekalongan dengan 13 desa terdampak, tahun 2016 seluas 660.63 ha atau 14.23 % dari total luas Kota Pekalongan dengan 10 desa terdampak, dan tahun 2018 seluas 960.96 ha atau 20.70 % dari total luas Kota Pekalongan dengan 13 desa terdampak. Hal ini desebabkan karena pengaruh faktor pasang surut, angin, curah hujan, serta penurunan muka tanah. Tinggi genangan dan durasi genangan setiap tempat berbeda, tergantung dari ketinggian elevasi tanah, serta jarak ke laut dan sungai.
Keyword: banjir rob, genangan, spasial, temporal

Judul: Analisis daerah genangan banjir rob (pasang) di pesisir utara Jakarta menggunakan data citra satelit SPOT dan ALOS
Abstrak: Most of the land area of the northern coast of Jakarta is a result of reclamation of mangrove forest area, thus changing the shoreline and mangrove buffer function vanish. Effect of shoreline phenomena such as tidal flood rob), it makes some parts of the region including the northern coast of Jakarta which has a coastline along the 32 km flood affected by tidal flood (rob). Floods tidal (rob) occur when sea water runoff to the mainland every time the high tides that inundate the region is lower than the average sea level. Effect of population makes land a solid building, make change in land cover wet into dry land by the construction of wet areas resulting from land use changes. Through the results of land use change, coastlines changes and inundation prediction using data of sea level rise can be explained tidal flood (rob). SPOT (2003) and ALOS (2008) satellite imagery can explain land cover changes over the past five years, and the value of sea level rise per year to predict inundation within the next ten years. Because of changes in coastal land, coastline changes that lead to the addition of soil (accretion) and a decrease in surface (abrasion). Addition of soil (accretion) explains the more advanced the shoreline that have an impact on the pool of sea water at high tide when the maximum occurs. Based on field surveys carried out, explaining that changes in the research area of coastal land cause tidal flood (rob). Inundation predictions using DEM-GDEM data 30 m, the level of the value of the coastline and the sea rose to explain the occurrence of inundation in coastal areas north of Jakarta in 2019. The results obtained from several methods to explain the inundation occurred in the same area, so that could explain the relevance of changes in land and sea level rise which resulted in tidal flood (rob) event.
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Judul: Characterization of CoCrMo alloy with titanium nitride and hydroxyapatite-chitosan coating
Abstrak: Endoprosthetic is moving tool for implant in the body, made of metals or polymers. Stainless steel, Co-based alloys, and Ti materials are widely used for implant materials. Co alloy used is CoCrMo which has excellent properties such as good biocompatibility, corrosion resistant, good mechanical properties such as hardness, strength, and high wear resistance, supporting its utilization as an implant material. CoCrMo alloy was synthesized using tri arc furnace with heating temperature of 3000 °C. TiN coating using plasma sputtering and nitriding method, characterized by a layer of gold. The content of Ti in the layer was 3.85% (w/w), whereas the content N was difficult to determine. Hydroxyapatite (HAp) was synthesized using wet method with Ca source of chicken eggshell and P source of H3PO4 80%. HAp-chitosan composite coating aimed at improving the biocompatibility and corrosion resistance of CoCrMo. In vitro test showed that CoCrMo with TiN and HAp-chitosan coating had excellent corrosion resistance in liquid medium infusion, whereas samples HAp and CoCrMo with TiN coatings and HAp-chitosan had high level of toxicity in endothelial cell culture tests.
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