Judul: Habitat characteristic of green turtle (Chelonia Mydas) nesting population at Pangumbahan Beach, Sukabumi, West Java.
Abstrak: Pangumbahan beach is one of green turtle (Chelonia mydas) nesting beach which still exist in West Java. Conservation strategy for green turtle in Pangumbahan beach include relocating eggs into hatchery sites. Accessibility and disturbance level at beach is important for seaturtle to choose preferable nesting sites. Most of Green Turtle in Pangumbahan preferred to nest at the centre part of the beach, especially at Pos 2. Natural nest temperature characteristic was different with the artificial ones (hatchery). Natural nest temperature ranged 26.0-29.6 (28.2±0.8)°C at the upper rim and 28.0-29.5 °C with mean of (28.6±0.8) °C at the bottom, while artificial nests temperature ranged 25.7- 28.3°C with mean of (27.2±0.8)°C at the upper rim and 28.3-33.2 °C with mean of (29.6±1.5)°C at the bottom. Characteristic of natural nests and artificial nests were dissimilar. According to the bathymetry, Pangumbahan Beach is quite accessible for seaturtle to land. Pangumbahan beach line is close to reef crest and directly connected with Indian Ocean. Sea surface temperature at high nesting abundance period was contrary to the period of low nesting abundance. The sea surface temperature during the high nesting period was cooler than at the low nesting abundance period. There was temperature gradient signature at high nesting abundance period whereas even temperature distribution occurred during low nesting abundance period. Keywords: green turtle (Chelonia mydas), nesting habitat, near shore habitat natural nest, artificial nest, sand temperature, Pangumbahan beach
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Judul: Potensi Penyu Hijau (Chelonia mydas L.) sebagai Daya Tarik Ekowisata di Kawasan Pantai Sindangkerta Kabupaten Tasikmalaya
Abstrak: Sindangkerta beach is one of the spreading locations of green turtles (Chelonia mydas) in Indonesia. The existence of the green turtles can potentially become one of the ocean ecotourism objects. The purpose of the research is investigating the potential of green turtles (environment, habit, spreading of nest, and laying eggs period), knowing the interest of visitors to the green turtle and arranging the planning of development of ocean tourism program based on green turtles to the organizer of wildlife reserve and the organizer around it. The data collection includes of green turtles potential data, data of visitors, community around Sindangkerta Beach, and the supporting data (accessibility, accommodation, and supporting instruments). The collected data will be tabulated and analyzed descriptively to get the information about the development and potential of green turtles and the activities of the tourism that have been done. For the development of tourism plan will be done by SWOT analysis. The green turtles which get off on the beach every year will be different in amount and will fluctuate. It can be influence by the weather (speed of wind). The potential of green turtles which can become the activity of ocean tourism based on the interest of the visitors is seeing the habit of green turtles in finding food and laying eggs, the activity of maintenance, and releasing the small green turtles. Most of the visitors are students (including students of colleges). Development of the ocean tourism is also supported by the local community. Visitors and local community hope that the development of ocean tourism can preserve the green turtles and increase the economic level for the local community by involving them in managing the program. Ocean tourism based on green turtles program can be done such as introducing and informing the visitors about characteristic of environment and the habit of green turtles at Sindangkerta Beach. Increasing the corporation with all stakeholders is needed in order to preserve the green turtles and to make a continuity of ocean tourism object.
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Judul: Aproksimasi Fungsi Sinus dan Kosinus sebagai Kombinasi Linear dari Fungsi Eksponensial
Abstrak: Salah satu gagasan yang menarik dalam matematika adalah aproksimasi suatu fungsi oleh fungsi lain. Sebagai contoh, fungsi polinom dapat diaproksimasi menggunakan deret Taylor atau fungsi persamaan diferensial dapat diaproksimasi menggunakan deret Fourier. Adapun fungsi yang dapat mengaproksimasi fungsi lain salah satunya adalah fungsi eksponensial. Kemungkinan mengaproksimasi fungsi dengan kombinasi linear dari fungsi eksponensial dari bentuk eˣ, e²ˣ, ... dianggap sebagai perkembangan sejajar dengan gagasan Deret Taylor yang mengaproksimasi fungsi dengan kombinasi linear dari segi fungsi kuadrat. Fungsi sin x dan cos x digunakan sebagai target untuk menilai seberapa baik aproksimasi yang dilakukan oleh fungsi yang diberikan. Aproksimasi fungsi sinus dan kosinus menggunakan hampiran Taylor lebih akurat dibandingkan dengan aproksimasi menggunakan fungsi eksponensial.
Keyword: Aprosimaksi eksponensial, aproksimasi fungsi, aprosimaksi Taylor, fungsi eksponensial