Judul: Deteksi Gas Hidrat Berdasarkan Perubahan Karakter Seismik di Perairan Laut Aru Menggunakan Teknologi Low-Frequency Acoustic.
Abstrak: Gas hidrat merupakan salah satu jenis hidrokarbon yang berbentuk padat dan terbentuk pada sedimen dasar laut. Gas hidrat tercipta pada suhu dan tekanan tinggi, yang tersusun dari molekul air dan gas. Gas hidrat berpotensi sebagai alternatif untuk menggantikan minyak dan gas bumi. Keberadaan gas hidrat di dasar laut dapat dideteksi dengan teknologi low-frequency acoustic seismic. Penelitian ini dilakukan dengan tujuan untuk melakukan deteksi keberadaan gas hidrat di Perairan Laut Aru berdasarkan perubahan karakter seismik gas hidrat. Metode deteksi keberadaan gas hidrat dilakukan dengan melihat kenampakan Bottom Simulating Reflectors (BSR) pada penampang seismik. Keberadaan gas hidrat di dasar laut dicirikan dengan memotong stratigrafi, membalikan polaritas, amplitudo tinggi, dan bentuknya mengikuti dasar laut. Data yang digunakan merupakan hasil akuisisi Pusat Penelitian dan Pengembangan Geologi Laut (PPPGL) tahun 2016 di Perairan Laut Aru.
Keyword: bottom simulating reflectors, gas hidrat, low-frequency, seismik

Judul: Identification of Gas Hydrate Zones on Bottom Simulating Reflector of 2D Seismic Sections in North Bali Waters
Abstrak: Seismik refleksi merupakan salah satu metode akustik bawah air yang digunakan untuk mendeteksi sumberdaya mineral dan gas. Salah satu gas yang dapat ditemukan dan menjadi objek penelitian ini adalah gas hidrat. Gas hidrat merupakan salah satu sumberdaya alternatif non-konvensional yang dapat menjadi pengganti dari sumberdaya minyak dan gas konvensional. Gas hidrat dapat diidentifikasi dengan memeriksa keberadaan Bottom Simulating Reflector pada pemrosesan data seismik 2D. Tujuan penelitian ini adalah memberikan informasi mengenai keberadaan Bottom Simulating Reflector di penampang seismik 2D serta mengidentifikasi zona gas hidrat pada Perairan Bali Utara pada penampang seismik 2D. Ditemukan keberadaan Bottom Simulating Reflector pada CDP 35- 812 dengan kedalaman ttwt 1526-1582 ms, dengan karakteristik high amplitudereverse polarity jika dibandingkan dengan reflector dasar laut. Data yang digunakan merupakan hasil akuisisi Kementerian ESDM tahun 2017 di Perairan Utara Bali.
Keyword: Bottom Simulating Reflector, gas hydrate, North Bali Waters, seismic reflection.

Judul: Studies on growth spurt and aging in higher primates
Abstrak: single measurement that best defines the health and nutritional status of children, just as it provides an indirect measurement of the quality of life of an entire population. The pattern of human growth reflects the biocultural evolution of our species. The human pattern of growth and development (ontogeny) appears to differ markedly from patterns of ontogeny in other primate species. Three studies are reported here which deal to the growth and development of human and chimpanzee (Pan troglodytes). These three studies allow us to contrast the phenomena of adolescence growth spurt and female elderly bone loss in chimpanzee and human as chimpanzee is the closest species to humans within extant nonhuman primates. In the first, a cross-sectional study of growth of the body size and somatotype of 363 Javanese girls and 299 Javanese boys aged 4 to 20 years from Magelang Regency, Indonesia was described. In the second, cross-sectional and longitudinal studies in the growth of chimpanzee second metacarpal bone linear dimensions from individuals aged 0 to 43.6 years were used for comparison. While in the third, cross-sectional and longitudinal studies in the growth of chimpanzee body size (body mass and anterior trunk length) and second metacarpal bone mineral content were derived. In measuring the second metacarpal dimensions and mineral content, a total of 568 radiographs of chimpanzee's proximodistal left hands were used. They were taken from 68 females and 49 males aged 0 to 43.62 years old. We applied an image analysis system, Scion Image Release Alpha 4.0.3.2 software for Windows to measure bone linear dimensions and bone mineral content. Humans present complex and sinuous growth curves for both body weight and height. A clear growth spurt could be demonstrated by cross-sectional analysis in our girl subjects at around aged 11.5 years and in our boy subjects at around aged 12.5 years. In longitudinal series, not in cross-sectional, several representative chimpanzees of both sexes showed a pre-adult growth spurt on the body sizes, bone dimensions and bone mineral content. They ranged at age 4.5 to 8.5 years. This underscore the fact that adolescent growth spurt in linear dimension was not a universal feature of anthropoid primate ontogeny. Bone loss is a well established characteristic of human female aging. Based on crosssectional analyses the sequential decline of bone mass in female chimpanzee may be said to be genuine. On the other hand, we found in adulthood through elderly, male chimpanzees show a longer plateau than female chimpanzee, that is, bone mineral content is maintained in male.
Keyword: Javanese children, growth spurt, chimpanzee, second metacarpal bone, bone loss, Higher Primates