Judul: Pengaruh Penggunaan Shelter Berbeda Terhadap Tingkat Kelangsungan Hidup Dan Pertumbuhan Lobster Pasir (Panulirus homarus) Pada Kegiatan Pendederan Secara Indoor
Abstrak: The problem that happen on growth spiny lobster Panulirus homarus are high of mortality and cannibalism rate because of adaptation lobster is not done before puting in floating net cages. This research was conducted to determine effect of using dfferent shleter materials to survival rate on nursery activities in indoor system. Materials shelter that used were PVC, net and control (without shelter). This research used completely randomized design and consisted of three treatments with two replications. A total 95 lobster’s seed kept at fiber of 1000 liters of water, reared for 70 days. The feed was trash fish. The feed that given refer to feeding rate (FR) of 10% biomass. Feed given one time a day. The result showed application of PVC’s shelter provide the highest survival, growth weight and lenght growth. Application of PVC’s shelter has 65,26±1,49% of survival rate, 5,72±0,60 gram growth seight and 10,43±0,15 cm lenght growth.
Keyword: weight,, survival rate, spiny lobster seed, shelter, body lenght

Judul: Evaluasi Pemanfaatan Kompartemen di Keramba Jaring Apung Terhadap Tingkat Stres dan Pertumbuhan Lobster Pasir Panulirus homarus
Abstrak: Still found weaknesses in survival rates and low productivity of spiny lobster, it is thought to be influenced by environmental factors such as stress levels arising from the cultivation of media used such as maintenance of the spiny lobster captured without the use of shelters, but shelter is useful as a shelter of cannibalism. So that the necessary development innovation of lobster container that can minimalized of stress levels and increase productivity such as making special compartment equipped with shelter. Compartments in this study is made of fiber-shaped cube that hung in floating net cages and lobster-sized used is ± 50gr/lobster derived from fishermen around the waters of Pelabuhan Ratu with the feed is trash fish with protein levels of 63.22%. Maintenance performed using a compartment in floating cages for 30 days.Test parameters were observed during the study consisted of the level of stress (kortisol and glucose levels in the hemolim), survival rates, weight gain, specific growth rate, behavior and quality of water. Experimental design applied in this study is completely randomized design. Treatments of this study consisted of (1) control treatment (K) that spiny lobsters were kept/cultivated in nets that did not use compartment and shelter with density of 20 lobster/m2, (2) KM1 treatment that spiny lobsters were cultivated used compartment with density of 25 lobsters/m2 and (3) KM2 treatment that spiny lobsters were cultivated used compartment and shelter with density 50 lobster /m2. Data of cortisol glucose and levels, survival and growth, were analyzed using ANOVA and with helped of software MINITAB 16. The results showed that the highest stress levels of spiny lobsters was found in control treatment, it was shown by the high levels of cortisol (1.59±0.28 nmol/l) and glucose (17.13±1.27 mg/dl), while the lowest stress levels was found in KM1 treatment with cortisol (1.17±0.14 nmol/l) and glucose level (8.34±0.5 mg/dl). The highest survival rate of spiny lobsters was found in KM2 treatment (95±0.03%) and the lowest survival rate was found in the control treatment (62.50 ±0.02%). The highest weight gain (26.29±1.69%) and highest specific growth rate (0.77±0.014%) were found in KM1 treatment, while the lowest weight gain (13.51±4.47%) and lowest specific growth rate (0.42±0.13%) was found in KM2 treatment. Spiny lobsters growths were cultivated using compartments and shelters was better than without using compartments and shelters. Spiny lobsters cultivated in floating nets without using compartments and shelters tend to be more stressful and caused decreasing of the growth and survival rates. Weight gain has a strong relationship with cortisol and glucose levels. Decreased levels of stress (cortisol and glucose levels) due to increase in growth Cortisol and glucose levels have a positive correlation, meaning that the increase cortisol levels followed by increased of glucose levels, which is in line with the opinion and Krogdahl Hemre (1996) and Falahatkar and Barton (2007) that cortisol can increase the levels of glucose in the haemolymph, disturbances in cortisol secretion may alter the response of glucose and increase glucose values can be attributed to differences in the mechanism of action of cortisol. Spiny lobsters cultivated using compartment showed normal behavior patterns
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Judul: Invers dari Matriks Tridiagonal Jacobi
Abstrak: Suatu matriks berukuran n×n dinamakan matriks tridiagonal jika untuk . Karya ilmiah ini memberikan algoritma yang mudah untuk menemukan invers ( dari matriks tridiagonal Jacobi yang simetrik dan nonsimetrik. Setiap elemen pada matriks tridiagonal ini adalah bilangan real. Terdapat 3 lema dan 2 teorema untuk menentukan . Lema pertama menunjukkan persamaan utama dalam membuktikan lema-lema dan teorema-teorema selanjutnya. Invers dari matriks yang simetrik dibuktikan oleh lema kedua yang menunjukkan elemen-elemen baris ke- dari . Selanjutnya, lema kedua dilengkapi dengan teorema pertama yang menunjukkan elemen-elemen dengan . Invers dari matriks yang nonsimetrik dibuktikan oleh lema ketiga yang menunjukkan elemen-elemen dengan dan elemen-elemen dengan dibuktikankan oleh teorema kedua.
Keyword: symmetric, nonsymmetric, matrix