Judul: Backscatter Characterization of Multi-temporal Radarsat Imagery in Ajkwa Tailing Deposition Area (Papua, Indonesia)
Abstrak: This Research investigated the characteristic of Multi-temporal Radarsat backscatter in F2N Identical Swath mode with more than 6 years of acquisition period. It included the assessment of the stability of Radarsat imageries for multi­temporal analysis by using variance analysis on the selected sample area of "permanent" landcover. This analysis, I was used to obtain Radarsat signal changes caused by the micro-geomorphology of tailing material propagation at the Modified Ajkwa Deposition Area (ModADA) of PT Freeport Indonesia, Timika, Papua. For this purpose, the 8 bit multi-temporal imageries was overlayed and interpreted, to describe the sequences of land cover dynamics resulting from the propagation of tailing material deposition. This overlay was visualy clear to describe the changes in signal characteristic due to certain condition of land surfaces. The result indicated different range of reflections. Diffuse reflection was detected on the undisturbed forest, natural comer reflection was related to the flooded vegetation, and specular reflection was mostly found on the established tailing. The reflection types was used to discriminate and to describe the segmentation class of Radarsat backscatter on the study area. Finally the segmentation analysis trial for each classs was implemented in the given image part. The intention was to assess the radar backscater characterstics as a potential information to study the sequence of moving tailing material in the tailing management purposes.
Keyword: Remote Sensing, Radar, Backscatter, Multi-Temporal, Segmentation, Tailing

Judul: synthetic aperture radar, peri-urban, TerraSAR-X, tone, texture, decision tree
Abstrak: Peri-urban is developed in urban or metropolitan fringe. The area has particular characteristics such as scattered settlements, slightly urbanized, fast population growth and a tendency of environmental degradation. Monitoring in this area is then required, especially to assess agricultural land conversion. This paper discusses an application of dual-polarized TerraSAR-X Spotlight Mode to retrieve various land cover in Sidoarjo, East Java. Specifically, the research studied discrimination among water bodies, rice fields, settlements, woody vegetation and industrial parks at X-band. The research compiled tonal and textural information from those land cover types and fed those signatures into statistical analysis. Decision tree classification method is applied to classify and to find most informative features. The results suggested that TerraSAR-X has capability to distinguish some land cover features; nonetheless, some objects could not have specific tonal/textural signatures, making them hard to classify.
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Judul: Peranan Hormon Dalam Mekanisme Kelahiran Pada Sapi
Abstrak: Kelahiran adalah proses keluarnya fetus dari kandungan atas pengaruh hormon, syaraf dan kontraksi otot uterus, diafragma dan otot perut. Proses kelahiran merupakan suatu rangkaian fisiologik yang kompleks yang dapat berlangsung beberapa hari, bahkan sampai seminggu. Meskipun studi mengenai mekanisme kelahiran telah banyak dilakukan, namun mekanisme yang tepat mengenai kelahiran belumlah diketahui secara pasti. Namun demikian kemungkinan besar faktor hormonal memegang peranan utama. Dalam proses kelahiran, uterus harus sudah bebas dari pengaruh progesteron dan berada dibawah pengaruh estrogen, oxytocin, relaxin dan prostaglandin. Oxytocin yang diha silkan oleh hypophysa posterior induk hewan, merupakan hormon yang memegang peranan penting dalam merangsang uterus untuk memulai berkontraksi. Pemberian estrogen, oxytocin dan prostaglandin dengan dosis tinggi dapat menyebabkan kelahiran sebelum waktunya.
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