Judul: Uji Coba Rumpon Elektronik pada Alat Tangkap Bagan di Pulau Lancang, Kepulauan Seribu, Jakarta
Abstrak: Electronics FADs is an innovative fishing tools that have the same function as in the general FADs to attract and collect fish. The trial of electronic FADs was did at liftnet gear, in purpose to see the performance of these tools. Effectiveness of use electronic FADs analysis from catch harvest. Electronic FADs has attractor a light (LED, 5 Watts) and sound (10-1000 Hz, 1-20 kHz dan 20-100 kHz) with a voltage source of 12 volt battery. Installation of electronic FADs in the trial following the existing catch method in the liftnet. Based on catches, electronic FADs managed to collect an average of 4.6 kg if time installation is an hour, and collect an average of 4.07 kg if time installation is 30 minute. Electronic FADs work well, attractor is able to function throughout the trial and managed to collect the fish, but when compared the effectiveness of the catch to the liftnet, then the use of electronic FADs in the liftnet is still not effective. Suggestions for improving the effectiveness of electronic FADs catch on the liftnet is increase the intensity and power on light attractor, and deeper study of the sounds frequency which response by fish
Keyword: 

Judul: Uji Coba Rumpon Elektronik pada Alat Tangkap Bagan di Pulau Lancang, Kepulauan Seribu, Jakarta
Abstrak: Electronics FADs is an innovative fishing tools that have the same function as in the general FADs to attract and collect fish. The trial of electronic FADs was did at liftnet gear, in purpose to see the performance of these tools. Effectiveness of use electronic FADs analysis from catch harvest. Electronic FADs has attractor a light (LED, 5 Watts) and sound (10-1000 Hz, 1-20 kHz dan 20-100 kHz) with a voltage source of 12 volt battery. Installation of electronic FADs in the trial following the existing catch method in the liftnet. Based on catches, electronic FADs managed to collect an average of 4.6 kg if time installation is an hour, and collect an average of 4.07 kg if time installation is 30 minute. Electronic FADs work well, attractor is able to function throughout the trial and managed to collect the fish, but when compared the effectiveness of the catch to the liftnet, then the use of electronic FADs in the liftnet is still not effective. Suggestions for improving the effectiveness of electronic FADs catch on the liftnet is increase the intensity and power on light attractor, and deeper study of the sounds frequency which response by fish.
Keyword: 

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