Judul: Pengaruh Perbedaan Atraktor Pada Korang Terhadap Hasil Tangkapan Juvenil Lobster di Desa Sangrawayang, Palabuhanratu.
Abstrak: This research has been done in Palabuhanratu Bay, Indonesia. Juvenile lobster (Panulirus sp.) is the main target fish in this research. This research was used Fish Aggregating Devices with two different types of attractor. This research was aimed to compared catches juvenile lobster from Fish Aggregating Devices by used different types of attractor, analyzed the effect of the attractor until getting the information about effectiveness kind of attractor. Attractor which used for comparison were seaweed and palm leaf as a test and a seaweed as a control. Korang is passive equipment was used to contain a fish or juvenile lobster and a tool that used to put a attractor. The result of comparition show that a total of catches with seaweed and palm leaf more than seaweed. This would be seen from succeed rank of catched a juvenile lobster in seaweed and palm leaf that value is 71,88 %. Furthermore, the result of statistic analyze with non parametric methode (Mann-Whitney) proved that is a effect of differences between seaweed and palm leaf and only seaweed because a mean rank of seaweed and palm leaf are higher than only seaweed. From the result concluded that seaweed and palm leaf more effective than seaweed.
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Judul: Efektivitas Perangkap Juvenil Spiny Lobster Berdasarkan Tingkat Kedalaman, Jenis Bahan Dan Lama Perendaman Di Perairan Palabuhanratu
Abstrak: The objectives of the research is to create an effective trap of spiny lobster juvenile base on trap position in the sea water layer, type of the material and trap soaking time. The experimental fishing was conducted in the Kertajaya Sangra wayang water of Sukabumi District. There are 7 levels of water depth are 1,5 m, 3 m, 4,5 m, 6 m, 7,5 m, 9 m, 10,5 m and 4 kinds material are waring, woven shirt, woven netting and gunny. The result of the research was the traps can catch the spiny lobster juvenile, the most catch was found in the 1-3 m water layers and use material gunny. The main catch was spiny lobster juvenile and catch were crustacean group and fish group (pisces). The trap’s position in the water layer influence the catch value of spiny lobster.. The most main catch was found in water levels 1,5m and 3m. The best material for spiny lobster juveniles trap was gunny. The fisherman can use spiny lobster juvenile trap by operating in water levels 1-3 m, use gunny meterial with one day soaking time.
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Judul: Solusi Geometri Schwarzschild untuk Dimensi 4+1 dengan Invarian Rotasi Isotropik
Abstrak: Metrik Schwarzschild merupakan solusi eksak pertama dari persamaan medan Einstein dengan mangasumsikan metrik statik dan simetris. Metrik Schwarzschild yang ditemukan oleh Karl Schwarzschild masih dalam dimensi 3+1, namun seiring dengan teori-teori terbaru yang menunjukkan bahwa alam semesta tidak hanya di dimensi 3+1. Maka melalui penambahan dimensi, tujuan penelitian ini memperoleh solusi pada geometri Schwarzschild untuk dimensi 4+1 dengan memodifikasi koordinat bola yang invarian rotasi isotropik dan melalui penurunan rumus seperti koordinat bola, simbol Christoffel, dan tensor Ricci. Selain mendapatkan solusi ini, metrik Schwarzschild dimensi 4+1 dapat digunakan sebagai metrik dasar untuk memperoleh solusi blackhole dan wormhole pada dimensi 4+1. Hasil akhirnya, dengan memanfaatkan modifikasi koordinat bola, metrik Schwarzschild dapat dibentuk sehingga diperoleh solusi geometri Schwarzschild untuk dimensi 4+1.
Keyword: metrik Schwarzschild, persamaan medan Einstein, modifikasi koordinat bola, penambahan dimensi, invarian rotasi isotropik