Judul: Study on Backscatter Characteristic of ALOS PALSAR Imagery Within Tropical Rain Forest
Abstrak: This study examined the relationship between variables of forest stand and backscatter magnitude of ALOS PALSAR having pixel size of 6.25 x 6.25 meters and 50 x 50 meters. The main objective of this study is to identify the variable of stand that significantly affect the magnitude of backscatter in different spatial resolution. The study was carried out in dry land tropical forest located in Dairi Regency, North Sumatera Province, this study found that the variable of stands that influence the backscatter are (1) basal area of tree, biomass of tree and height of tree for resolution of 6.25 m, and (2) basal area of tree and biomass of tree for resolution 50 x 50 meters. These variables provides dominant influence on the backscatter magnitude. The study found that discriminating stand classes base on the above mentioned variables in quite prospective, providing accuracy more than 85% particularly in using a resolution of 50 x 50 meters, however less accuracy is provided by ALOS PALSAR imagery with higher spatial resolution.
Keyword: 

Judul: Study on The Backscatter Characteristics of ALOS PALSAR Having Spatial Resolution of 50 Meters and 12.5 Meters within Rubber and Oil Palm Plantations
Abstrak: The study was performed to explore the relationship between the dimensions of rubber and oil palm plantations and backscatter of ALOS PALSAR having resolution 50 meters and 12.5 meters. The study was carried out in Simalungun Regency, Serdang Bedagai Regency, Asahan Regency and Pematang Siantar City North Sumatra Province. The main objective of the study is to identify crop variables that affect backscatter value. The study found that the rubber plantation variable that significantly affect the magnitude of backscatter of 50 meter resolution are the diameter at breast high (dbh) and basal area giving an accuracy of 75.44%. For oil palm plantation, the backscatter value was affected by canopy diameter with accuracy of 92.16%. For rubber plantation, the variable that affect the magnitude of backscatter of 12.5 meter resolution are the tree diameters, biomass volume and the ratio of crop spacing as well as canopy area with an accuracy of 66,67%. Meanwhile, for oil palm plantation, it was affected by height of plant with an accuracy of 62.75%.
Keyword: 

Judul: Definisi zat besi ( Fe ) pada anak babi
Abstrak: Dalam bidang sub sektor peternakan, ternak babi mempunyai prospek yang cukup baik untuk dikembangkan dalam rangka meningkatkan eksport non migas. Namun anak-anak babi yang sedang menyusu sering mengalami defisiensi zat besi (Fe). Bila masalah ini tidak segera ditanggulangi, peternak akan mengalami kerugian. Zat besi dapat diperoleh dari makanan yang berasal dari hewan (tepung tulang, tepung ikan, tepung daging, "skimmed milk"); tumbuh-tumbuhan (leguminosae, rumput-rumputan, biji-bijian) dan mineral alam (Girindra, 1979). Dalam tubuh hewan, zat besi berperanan sebagai pembawa 02 ke seluruh jaringan, juga sebagai pembawa oksigen pernafasan di dalam sel urat daging (Underwood, 1981). Dalam duodenum dan yeyenum bagian atas, besi dalam bentuk ferro akan diserap. Penyerapan ini akan diatur berdasarkan teori "mucosal block" dari Granick. Kemudian dalam plasma darah, besi akan berikatan dengan B₁ globulin dan membentuk transferrin, yang akan segera dibawa ke seluruh jaringan. Kelebihan besi akan diikat oleh apoferritin dan membentuk ferritin yang ditimbun sebagai besi cadangan, terutama di hati. Bila kapasitas besi yang dapat disimpan sebagai ferritin telah jenuh, maka besi akan ditimbun sebagai hemosiderin. Zat besi dalam jumlah yang sedikit akan diekskresikan melalui pengelupas- an epitil, tinja, air kemih, cairan empedu, keringat. ...
Keyword: