Judul: Variabilitas Iklim dan Kejadian Kebakaran Hutan dan Lahan Gambut di Kabupaten Bengkalis, Provinsi Riau.
Abstrak: Bengkalis is one of districts which is vulnerable to forest and peatland fires in Riau due to land use change. This research aims to compare the observation climate data of Indonesian Agency for Meteorological, Climatological and Geophysics (BMKG) and global climate data from Climatic Research Unit (CRU) satellite as factors that affect the incidence of forest and peatland fires, analyze the distribution of forest and peatland fires in Bengkalis, and analyze the correlation between the elements climate (rainfall, maximum air temperature, and average air temperature) of CRU satellite and hotspot as an indicator of forest and peatland fires in Bengkalis. The result of the research revealed that climate patterns of CRU satellite in line with climate patterns of BMKG observations.. Spatial distribution of hotspots, 1998, 2002, 2004, 2005, 2006, and 2009 had the highest number of hotspots. Most hotspots are in the peat soil types Hemists/Saprists (60/40), very deep and on land cover shrub swamp. The maximum air temperature and average air temperature significant (p-value <0.05) to the number of hotspots while the rainfall did not significantly affect the number of hotspots. The best model also showed the absence of a suitable model to describe the relationship between elements of the climate and the number of hotspots.
Keyword: Climatic Research Unit, hotspot, climate, peat fires

Judul: Analisis Variabilitas Iklim dan Kejadian Kebakaran Hutan dan Lahan di Kabupaten Bengkalis, Provinsi Riau
Abstrak: Kebakaran hutan di Indonesia merupakan salah satu masalah lingkungan serius yang sampai saat ini masih belum dapat diatasi dengan baik. Provinsi Riau merupakan daerah rawan kebakaran hutan dan lahan yang didominasi oleh kebakaran di lahan gambut. Pada tahun 2015, Provinsi Riau termasuk salah satu provinsi yang mengalami kebakaran hutan dan lahan yang luas. Tujuan dari penelitian ini adalah menganalisis pola unsur iklim, distribusi titik panas, dan korelasi antara unsur iklim dan titik panas (hotspot) sebagai indikator kejadian kebakaran hutan dan lahan di Kabupaten Bengkalis, Provinsi Riau. Hasil penelitian menunjukkan bahwa Kabupaten Bengkalis mempunyai dua periode musim kemarau, yaitu pada bulan Februari-Maret dan Juli-September, serta memiliki puncak curah hujan tertinggi pada bulan Maret-Mei dan Oktober- Desember. Jumlah titik panas tertinggi di Kabupaten Bengkalis terjadi pada tahun 2015 dibandingkan dengan tahun 2016 dan 2017, yang dipengaruhi oleh fenomena El Nino. Curah hujan, suhu udara rata-rata, dan suhu udara maksimum berpengaruh nyata (p-value<0.05) terhadap distribusi titik panas.
Keyword: El Nino, Riau, titik panas, unsur iklim

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
Keyword: