Judul: Pengendalian Kualitas Ikan Tenggiri di PPI Karangsong Kabupaten Indramayu
Abstrak: PPI Karangsong is one of the ports that has in Indramayu. The catch which is put ashore on ppi karangsong very diverse and abundant. Many types of fishing gear used are gillnet millennium, with the catch of mackerel is an important commodity and has economic value. Operation of gillnet gear will take approximately 30 to 45 days. Long time required in making the arrest will affect the quality of fish. The purpose of this study was to observe the handling applied by fishermen aboard a gillnet in determining the quality of fish in the PPI Karangsong. The method which was used in this research is case study, with organoleptic observations, control p chart analysis, pareto diagrams and diagram of cause and effect. The results of observations conducted in PPI Karangsong, the average value of test organoleptic was range from 6 to 7. These values indicated that the fish is still good and worthy to be consumed. The process of handling mackerel fish on gillnet ship was still within the bounds of the control. This could be seen on diagram of the control chart, proportion of unfresh fish was still in the control limits. The criteria of unfresh fish which was discovered were broken and slimy gills (35,71%), Flesh of the abdomen that was somewhat pulpy (21,42%), and red eyes (16,67%).
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Judul: Optimasi Teknis Perikanan Gillnet Millenium di Desa Karangsong, Kabupaten Indramayu
Abstrak: Northern Java Sea has already know as one of the most productive sea in Indonesia. Development of PPI Karangsong, is one of Fisheries development policies of Indramayu Regency for increasing the regional economic growth. Gillnet millennium is one of the most popular fishing gear in PPI Karangsong. Fishermen in Karangsong use gillnet millennium in some variation type of technical and operation method. This study aims to determine which gillnet millennium variation type has the best optimization score. This study was held by using survey method, and the data collected by purposive sampling method. Based on the results of the study revealed that the ship that operate in the PPI Karangsong made of wood with the size of the 5 GT, 20 GT, 30 GT, 40 GT and 60 GT. .Gillnet millenium that are used by fishermen made of polyamide monofilament material, the size of the gillnet millenium that is operated on the basis of the size of the ship is all 20 pieces up to 110 pieces. The fishermen in karangsong most of the fishermen are full. The score of the function for four groups as studies object are 0,18 (< 10 GT), 2,812 (20 GT), 1,824 (30 GT), and 2,89 (> 40 GT). Production factors that influence the optimization of gillnet millennium are depth of the net, number of day of the trip, and the fishing location.
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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