Judul: Hubungan Penggunaan Lahan dengan Bentuklahan di Daerah Pesisir Kabupaten Cianjur
Abstrak: Java Island is the most dominant volcano area in Indonesia. Many volcano and different land form disseminate cause the variaty of land uses in Java Island. The aims of this research are to mapping land uses from IKONOS imagery, to mapping land forms from SRTM-30 Imagery, and also relation between land forms and land uses in south coastal Cianjur Regency. The mapping of land forms is done use SRTM 30 imagery based on approach of morphocronology, morphography, morphogenesys, and morphometryc. Land uses map is made with focus to some supporting interpretation keys in on screen deleniation. The most dominant land form in south coastal Cianjur Regency is old denudational volcanic mountain area (16.1%) that disseminate in east area. Seen by some land forms aspect (morphography, morphometryc, and morphogenesys), land uses in south coastal Cianjur Regency is dominated by forest, mix garden, and paddy field. Forest dominate at mountain area land form with rather steep slope until very steep slope from denudational volcanic process. Mix garden dominate at hill and valley area with slight until rather steep slope from vulcanic and fluvial denudational process. Paddy field dominate at plain land form with flat until slight slope from marine process. Based on double regretion analysis result between land uses as no release variabel and land forms aspect (morphometryc and morphogenesys) as release variabel, show that relation between both of them is significant influence according to statistics. The relation of both variabel have R2 value between 78% until 92% that is dominated influneced by morphometry aspect.
Keyword: Bogor Agricultural University (IPB), volcano, slope, landuse, andform

Judul: Hubungan Geomorfometri dengan Bentuklahan dan Penggunaan Lahan (Studi Kasus: DAS Cileungsi-Citeureup, Kabupaten Bogor).
Abstrak: The image interpretations for landform mapping are mostly carried out visually, since the landforms can’t be indentified solely from land cover spektral. To reduce the subjectivity of visual interpretation, the quantitative analysis of geomorfology (geomorphometry) is expected to facilitated for landform’s identification and delimitation objectively. TWI (Topographic Wetness Index) and TRI (Terrain Ruggedness Index) are some of geomorphometric analysis that can be attempted to that purpose, especially for erosional and depositional landforms. This study took place in the Cileungsi- Citeureup Watershed, Bogor Regency, and aims to: (1) determine the type and distribution of landform in the study area, assess the value of TWI and TRI, and understand the relationship between landforms to TWI and TRI; (2) determine the type and distribution of land cover/land use and to understand the relationship between land cover/land use to TWI and TRI. The method for landforms and land use mapping is visual interpretation and on-screen digitization respectively on Shuttle Radar Topography Mission (SRTM) hillshade (30m resolution) and IKONOS imageries. The TWI and TRI were assessed from SRTM’s digital elevation models (DEMs) using SAGA and ArcGIS softwares. The result shows that the landforms of study area can be divided into 24 types, and based on the morphography and morphogenesis the dominant landforms are denudational hills. The relationship between landforms and TWI is illustrated by the distribution of TWI’s dry class on mountainous areas, the moderate class covers almost all of landforms, and the moderately to wet classes covers the valley and plain landforms. As for the relationship to TRI, it is illustrated by the dominant distribution of TRI’s rough class on the mountainous landforms, the moderate class on the hillslopes, and the smooth class on the plains landforms. According to the land use interpretation and classification, it can be divided into 5 type where the mixed gardens and dry field crops are the most widely types, respectively 45.31 km2 (25.70%) and 42.08 km2 (23.86%) of study area and covering the hilly areas. In relation to TWI and TRI, the mixed gardens and dry field crops spread out dominantly in the moderately dry TWI areas and in the moderately smooth TRI areas.
Keyword: geomorphometry, TRI, TWI, landforms, land cover/land use, Cileungsi-Citeureup Watershed, Bogor

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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