Judul: Parameter Oseanografi Kaitannya dengan Produksi Hasil Tangkapan Ikan Pelagis Besar di Perairan Teluk Palabuhanratu
Abstrak: The availability of big pelagic species in waters of Palabuhanratu Bay always changes all the time. It causes the number of fish catches by payang vessel to fluctuate significantly. One of suspected causes was correlation to oceanographic influences such as Sea Surface Temperature (SST) and chlorophyll-a. The purposes of this research were to estimate the productivity and peak season of big pelagic species; identify the SST and chlorophyll-a variability on waters of Palabuhanratu’s Bay, and analyze correlation between oceanographic parameter with the number of fish catches. This research used comparative analysis and case study. The result showed that the productivity of cakalang and tongkol decrease every year; peak season of tongkol occured on June, September, Oktober, November and December whereas cakalang occured on January, April, May, June and July; the value and coeficient of SST variability were 2,39 and 5,37; the value and coeficient of chlorophyl-a variability were 0,68 and 49,53; the correlation between oceanographic parameter and tongkol catch was very low while the correlation between oceanographic parameter and skipjack tuna cacth was low.
Keyword: chlorophyll-a., SST, skipjack tuna, tongkol, payang

Judul: Variabilitas hasil tangkapan ikan hubungannya dengan sebaran klorofil-a dan suhu pemukaan Laut Data Inderaja di Perairan Kalimantan Timur
Abstrak: Sea surface temperature (SST) and chlorophyI1-a are two important oceanographic parameters determining the abundance and distribution of fish. The aim of this research is to determine the variability of SST, chlorophyll-a, fish catch and the relationship between SST, chlorophyll-a with fish catch. This study took place in East Kalimantan waters. The data of this study has been taken from Aqua MODIS level 3 satellite images, data of meteorology and fish catch. East Kalimanm waters provides pelagic fish resource dominated by scads, frigate tuna and stripped mackerel. The amount of fish catch from east Kalimantan waters landed at PPI Selili Samarinda city was significantey correlated with SST (r = 0,53) and chlorophyll-a concentration (r = 0,63). Both oceanography parameters were fluctuative seasonally. The SST reached its maximum (30,49 OC) during west to east switchover season and reached its minimum (28,67oC) during north west monsoon season. Mean while the chlorophyll-a content reached its maximum (0,420 mg/m3) during west season and reached its minimum (0,118 mg/m3) during east to west switchover season. The peak of fish landing at PPI Selili Samarinda city occurred during north west monsoon season when SST was low and chlorophyll-a concentration is high, vice versa, the poor fish landing occurred during west to east switchover season when SST was high and chlorophyll-a was low.
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