Judul: Kajian Laju Deforestasi dan Degradasi Hutan Di Kabupaten Lamandau dan Kotawaringin Barat Provinsi Kalimantan Tengah
Abstrak: Issue of deforestation and forest degradation has been attracting the international and national community’s attention. This study was performed to identify rate and driving force of deforestation and degradation occurred in Lamandau and Kotawaringin Barat, Central Kalimantan Province. The study objective is to identify the rate and driving forces of deforestation as well as forest degradation using medium resolution image, Landsat TM. The classification method used to detect and analyze deforestation and forest degradation was visual interpretation, then followed by thematic change technique. Identification of deforestation and forest degradation driving force was done using a depth interview. The results of study show that the deforestation rate during the period of 1990-2013 is 56 408.3 ha/year, while forest degradation rate is 36 195.0 ha/year. The main driving forces of deforestation and forest degradation are opening up forest for road constructions, settlement establishment, estate crop and agriculture development. The major agents of deforestation and forest degradation are local community contributing of approximately 10%, while the rest was contributed by estate crop company (palm oil company).
Keyword: visual interpretation, thematic change, driving force, forest degradation, deforestation, Bogor Agricultural University (IPB)

Judul: Lintasan dan Model Spasial Deforestasi di Kalimantan Periode 2000-2013
Abstrak: Carbon emissions in Indonesia was contributed by the forestry sector. Yet, forest absorbs carbon emissions by photosynthesis processes and stores it in the forest biomass. This conditions causes the forestry sector could played a main role in the efforts to reduce global warming. Emission in forestry sector is mainly caused by deforestation for various purposes. Sustainable forest management approaches as important mechanisms to ensure balance in the use of forest resources for humans and the environment. Kalimantan island has large forest cover and has high rate deforestation. The trajectory and spatial model of deforestation was expected to provide more detailed information about the phenomenon of deforestation in Kalimantan that could be organized on sustainable forest management planning. This study used time-series land cover data from Ministry of Forestry in 2000–2013 and validated with SPOT 5/6 images in 2013. land cover data was used to analyzed the trajectory and spatial model of deforestation. The spatial model of deforestation were developed using logistic regression with data in 2000–2006 and then implemented in 2006–2013. The variables that used to predicted influence on the models were slope, altitude, peatlands, distance from forest edge, distance from plantations edge, distance from road, distance from river, farmer households, human population and Gross Regional Domestic Product (GDRP). Trajectory analysis of deforestation in Kalimantan in the period 2000-2013 suggests that a deforested has not been optimally exploited because most of land cover were still in the form of shrubs until the end of the period. The results of logistic regression analysis that obtained spatial model of deforestation in Kalimantan Pi = 1.1480714 - (0.033262*slope) - (0.002242*elevation) - (0.000413*distance from forest edge) + (0.000045*GDRP). The result of validation test of deforestation model in 2000–2006 has a value of overall accuracy about 79.64% and model of deforestation in 2006–2013 has value of overall accuracy about 77.01%.
Keyword: trajectory, spatial model, logistic regression, deforestation, Kalimantan

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.
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