Judul: Geomorphological based small island and its ecosystems classification in Indonesia
Abstrak: Fishing in Indonesia remains as open access. As the largest archipelagic country in the world mostly comprising of small islands, Indonesia’s big shallow water area around small islands has an important role as fishing ground area ecosystem, thus need bordering to control access of fishery. Small islands and its marine ecosystems have high variety of biogeophysical characteristic which made it difficult to obtain information from. The use of satellite imagery to identify small island and marine ecosystem is still constrained by the availability of the proper image processing technique for the variety of characteristics. This research aims at selecting remote sensing data processing techniques in order to analyze the geomorphology of small islands and its marine ecosystems, classifying island type, designing identification of marine ecosystem and also designing small islands classification based on geomorphological characteristics for fishery planning. Study areas selected at small islands of Kota Batam, Kabupaten Sikka, and Kabupaten Sitaro. Several islands are selected to represent tectonic, volcanic, and reef type and to represent the main marine ecosystems such as mangrove, coral reef and sea grass. Landsat, SPOT and QuickBird images, along with Geological map, Topographic map, Navigation map and field survey are used to find out geomorphologic data of small islands. Steps on image processing composed of multispectral fusion, enhancement and multispatial fusion techniques. Small islands geomorphological analysis method consists of morphology, morphogenesis, morphochronology, and morpho-arrangement aspects which are conducted by landforms identification by landscape approach. Correlation between small island and shore fishery is analyzed by the number of fish species on seven locations with 3 and 10 meters depth using diversity, uniformity, and dominancy indexes.
Keyword: marine ecosystem, island type, remote sensing, classification and identification

Judul: Klasifikasi Ekosistem Terumbu Karang Berbasis Objek dan Piksel di Pulau Morotai
Abstrak: Most researches on the classification ofcoral reef benthic habitat mapping were conducted on pixel base analyses. This technique may lead to some extent of misclassification of coral reef ecosystem due to a high diversity and high spatial heterogenity. An alternative technique to reduce misclassification, an object-based image classification (OBIA) algorithm was proposed. This techniques first decomposed an image into relatively homogeneous objects or areas and then classified these objects (areas) instead of pixels. OBIA has been well developed and applied in terrestrial studies in past decades, but the method has not been used adequately on benthic habitat mapping. In addition to an image classification technique as one of the component in the analysis of remote sensing, the selection of a classification algorithm was also an important factor because it can largely affect the final result. Benthic habitat mapping studies of coral reefs are generally applied with traditional classification algorithms such as Maximum Likelihood (ML), which requires the spectral response of each class following the pattern of normal distribution (Gaussian distribution). In contrast to a contemporary algoritm, the machine learning algorithm has received more attention in the benthic habitat mapping for producing higher accuracy thanML classification algorithms. Currently, the machine learning algorithm has been widely used in the commercial remote sensing data processing both on pixel-based and object-based. The algorithm is also potential to be developed for coral reef ecosystem mapping. Application of an object-based classification technique with machine learning algorithm is still limited in Indonesia, especially for mapping of coral reefs, therefore, it requires an intensive study to develop this algorithm as an alternative for traditional algorithm. The general objective of this research was to identify the effectiveness of the application of satellite image classification techniques in generating detail mapping information of coral reef ecosystems. To achieve this objective, the following special objectives were developed: (1) to develop a systematic approach in the coral reef ecosystem classification to define the classification scheme, (2) to mapping coral reef ecosystems using object-based classification techniques with advanced classification algorithms (machine learning) on satellite image data, and (3) to assess status of coral reef ecosystems within the last few decades. Results of this study were expected to be used for consideration in the sustainable management of coral reefs ecosystem in the District of Morotai Island, especially in North Maluku, and can be used as a baseline to support the development of the field of mapping and remote sensing of coral reef ecosystems. This research was conducted in the coral reef ecosystem located in the western part of the Morotai island in North Maluku province. The study stepsconsisted of equipment preparation, data collection, data processing, and preparation of dissertation begins in September 2012. Field data collection was held in October 2012, while processing and data analyses were conducted from January v to September 2013. The method used in the study consisted of field data collection using the technique of line transects photo quadrat, pre-processing of Landsat 5TM, 7EMT + and 8OLI, the development of a classification scheme with ecological approach quantitative analysis based grouping in a hierarchical
Keyword: change detection, classification scheme, Morotai Island, object and pixel based classification, support vector machine

Judul: Sintesis Paduan CoCrMo dengan Variasi Kandungan Nitrogen.
Abstrak: Sintesis paduan CoCrMo dengan komposisi utama Co-30%Cr-5%Mo dan variasi nitrogen antara 0% sampai 1% dilakukan melalui metode forging serta rolling pada temperatur 1250 oC selama 2,5 jam. Nitrogen dalam paduan CoCrMo berfungsi untuk menstabilkan fasa γ sehingga mampu dihasilkan paduan yang baik untuk dilakukan pengerjaan tempa. Namun berdasarkan hasil penelitian masih terdapat fasa ε dan σ dalam paduan CoCrMo sehingga mengkibatkan keretakan pada saat deformasi karena bidang slip yang tidak terarah. Untuk meningkatkan kekerasan paduan CoCrMo dilakukan penambahan unsur nitrogen karena atom nitrogen berdifusi secara interstisi didalam paduan. Peningkatan kekerasan yang signifikan sebesar 23% terjadi pada sampel dengan kandungan nitrogen 0,35% jika dibandingkan dengan paduan CoCrMo tanpa nitrogen. Penambahan N sebesar 1% memiliki tingkat kekerasan maksimal yaitu 689,33 kgf/mm2. Laju korosi yang paling baik ditunjukkan oleh sampel tanpa nitrogen yaitu sebesar 0,0025 mpy. Perbedaan nilai laju korosi ini dipengaruhi oleh kondisi permukaan paduan CoCrMo. Paduan dengan N=0,6% memiliki laju korosi terbesar yaitu 0,039 mpy karena terdapat keretakan pada permukaan paduan yang cukup besar. Struktur mikro paduan Co-30%Cr-5%Mo pada pengerjaan forging menunjukkan keberadaan struktur kristal hcp didalam matrik fcc. Penambahan nitrogen pada paduan CoCrMo menjadikan ukuran butir lebih besar sehingga mengakibatkan ketahanan fatigue yang rendah dan kegagalan klinis.
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