Judul: Manajemen Pelestarian Penyu Sisik di Taman Nasional Kepulauan Seribu dan Taman Nasional Karimunjawa
Abstrak: Hawksbills turtle are one type of rare and protected animals found in the waters of Indonesia because it population had sharply decreased. Conservation efforts that need to be performed such as arranging a turtle captive breeding program in Kepulauan Seribu National Park and Karimunjawa National Park which aimed at keeping the turtles population. This research aims to measure the success of hawksbills preservation management, identify the technical aspects of hatching and maintenance management, and find out the utilization that can be performed based on perception of visitors. The results showed that success rate in TNKpS an TNKJ are in the low category, which are valued on 52.5% and 37.5%. Technical aspects of turtle preservation management consist of hatching and maintenance management. The utilization that can be made against the turtles preservation was limited tourism which emphasize on education aspect and minimize physical contact with turtles.
Keyword: TNKJ, TNKpS, maintenance management, hawksbill turtle, hatching management

Judul: Management of Hawksbill Turtle Egg Hatching, Rearing, and Welfare in Karimunjawa National Park
Abstrak: Taman Nasional Karimunjawa (TNKJ) merupakan kawasan konservasi yang menjadi tempat penyebaran dan peneluran penyu. Penelitian bertujuan menganalisis manajemen penetasan telur dan tingkat keberhasilan penetasan telur, pemeliharaan penyu sisik dan menilai tingkat kesejahteraan tukik penyu sisik, serta menilai tingkat keberhasilan manajemen pelestarian penyu sisik dilihat dari aspek teknis pengelolaannya di Penetasan Semi Alami TNKJ. Penelitian ini dilakukan dengan metode observasi lapang, wawancara, dan studi literatur. Persentase keberhasilan penetasan telur memiliki rata-rata 47,4 % dan dilakukan uji SPSS dengan taraf kepercayaan 95 % menunjukkan hasil persentase keberhasilan telur di musim hujan dan kemarau tidak terdapat perbedaan yang signifikan. Kesejahteraan satwa di Penetasan Semi Alami TNKJ memiliki nilai sebesar 56,5% dengan kategori butuh pembinaan. Tingkat keberhasilan manajemen pemeliharaan penyu sisik di Penetasan Semi Alami TNKJ memiliki nilai 73,75 % dengan kategori B. Tingkat kegagalan penetasan telur yang berada di Penetasan Semi Alami TNKJ memiliki skor empat dikarenakan tingkat kematian sebesar >40 %. Dibutuhkan perbaikan dalam pengelolaan agar meningkatkan proses pemeliharaan., Karimunjawa National Park (TNKJ) is a conservation area where turtles spread and nest. The research aims to analyze egg hatching management and the success rate of hatching eggs, rearing hawksbill turtles and assessing the welfare level of hawksbill turtle hatchlings, as well as assessing the success level of hawksbill turtle conservation management seen from the technical aspects of management at the TNKJ Semi-Natural Hatchery. This research was conducted using field observation, interviews and literature study methods. The percentage of egg hatching success averaged 47.4% and the SPSS test was carried out with a confidence level of 95% showing that there was no significant difference in the percentage of egg success in the rainy and dry seasons. Animal welfare at the TNKJ Semi-Natural Hatchery has a score of 56.5% in the need for guidance category. The success rate of hawksbill rearing management at the TNKJ Semi-Natural Hatchery has a score of 73.75% with category B. The failure rate for egg hatching at the TNKJ Semi-Natural Hatchery has a score of four due to the mortality rate of >40%. Improvements are needed in management to improve the maintenance process.
Keyword: tingkat keberhasilan manajemen, tingkat kesejahteraan, penetasan telur, penyu sisik

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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