Judul: Pengaruh Risiko Produksi Terhadap Keuntungan Usaha Pembenihan Ikan Lele di Kecamatan Pagelaran Kabupaten Pringsewu Provinsi Lampung
Abstrak: Survival Rate (SR) is an indicator of the risk of catfish hatchery production. The research aims to analyze the influence of production risk to farmer sales revenue at Pagelaran Subdistrict and also to knowing farmer preference to production risk which is decreased production drastically. Based on the research, SR can influence sales revenue because the number of fish that are harvested determine the magnitudes of the sales revenue. If the SR is low, the the income also low. However, if the SR is high, the the income getting high. The SR value at risk condition is 56 percent of Sangkuriang Catfish is higher compared with Dumbo Catfish SR that amounted to 38 percent.SR normal is 90 percent. So the Sangkuriang sales revenue is bigger than the Dumbo which has Rp3 811 487 net income value. There are three preference do farmer when facing the drastically decreased production or SR close to zero persen because of the mass death, the first is continued efforts by directly doing the spawning cycle for the next, the second is choose to temporarily stop the production and the third is swith on other commodities.
Keyword: sales revenue and farmer preference, SR, risk production, catfish

Judul: Analisis Risiko Produksi Pembenihan Lele Sangkuriang Pada CV Dejee Fish Kabupaten Sukabumi
Abstrak: Sangkuriang catfish (Clarias sp) which lives in freshwater habitats, has a good economic value. One of the companies that work’s on the cultivation of sangkuriang catfish is CV Dejee Fish, located at Cibaraja’s Fish Market, Cisaat, Sukabumi. Unfortunately, this business is highly related to several risks such as production risk where CV Dejee Fish production fluctuates in a high manner. The object of this study is to identify the sources of production risk, the chances, the impact, and some alternative strategy to handle the risk. The sources of production risk are identified as fungi, water quality, fish feed, and harvesting technic. Furthermore, in order to understand how big the chances and impact of the risk are, Z-score and VaR analysis tool is used. Results from the research shows that on the per period per hetchery, the risk probability from fungi is 40 percent, water quality 44 percent, feeds 5 percent, and harvesting technic 4 percent. The impact of the risk from fungi cost is Rp 5 795, water quality Rp 4 937, feeds Rp 3 388 and harvesting technic Rp 3 736.
Keyword: Bogor Agricultural University, Production of risk, Z-score, Analisis sumber risiko produksi, Analisis peta resiko

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