Judul: The performance of madagascar cockroaches (Gomphadorhina portentosa) on diets containing a combination of concentrates with potatoes and sweet potatoes was overseen., The performance of madagascar cockroaches (Gomphadorhina portentosa) on diets containing a combination of concentrates with potatoes and sweet potatoes was overseen.
Abstrak: Dalam usaha budidaya kecoa, pakan memegang peran penting dalam keberhasilan produksi dan pertumbuhan yang baik untuk memenuhi permintaan konsumen. Oleh karena itu, alternatif pakan yang murah dan mudah didapat perlu dicari, dan bahan lokal seperti ubi jalar dan kentang menjadi pilihan yang tepat, karena sesuai dengan habitat kecoa madagaskar yang mudah beradaptasi dengan jenis pakan tersebut. Penelitian ini bertujuan menganalisis performa kecoa madagaskar (Gromphadorhina portentosa) terhadap kombinasi pakan konsentrat dengan beberapa jenis pakan lokal (kentang dan ubi jalar). Penelitian ini menggunakan metode RAL (Rancangan Acak Lengkap) dengan perlakuan KF: 100% pakan konsentrat (kelompok kontrol), KU: 50% pakan konsentrat + 50% ubi jalar, KK: 50% pakan konsentrat + 50% kentang, dengan uji lanjut Duncan. Hasil penelitian menunjukan bahwa penggunakan kombinasi pakan konsentrat dengan penambahan kentang dan ubi jalar berpengaruh terhadap performa kecoa madagaskar. Pakan konsentrat dengan penambahan kentang dapat meningkatkan pertambahan bobot badan sebesar 0,45 g ekor-1 ., Feed have important roles in cockroach rearing. Feed quality affected the cockroach gowth and production which will affect the standard demand and consumer. Based on the fact, it is crucial to seek alternative feeds which is cheap and available at any time riquaired. Local feed such as potatoes and sweet potatoes are good choices, for madagaskar cockroach's habitat and cockroach can be quickly adapted to these feeds. This study aimed to examine the performance of madagaskar cockroaches (Gomphadorhina portentosa) given combination of concentrate with various local feed ingedients (potatoes and sweet potato). Data was analyzed using Completely Randomized Design. The applied treatment design as follows: KF: 100% concentrate (control goup), KU:50% concentrate +50% sweet potato, KK: 50% concentrate +50% potato, according to Duncan's test. The performance of madagascar roaches was affected by a combination of concentrates with potato and sweet potato. In this test, concentrates supplemented with potatoes could increase body weight gain by 0,45 g tail -1
Keyword: feed, madagascar cockroach, performance

Judul: Penampilan produksi kecoa madagaskar (Gromphadorhina portentosa) pada masa pertumbuhan (umur 20-200 hari)
Abstrak: Madagascar cokroach (Gromphadorhina partentosa) is one of the bigggest type in the world and it's almost like a small mouse. Madagascar cockroach type in the world and it's size almost like a small mouse. Madagascar cockroach originally from Madagascar Island and known as "hiding roach" or "giant madagascar hissing cockroach". This cockroach is not yet raised in Indonesia, where as the environment is not so different than in Madagascar. To cultivate Madagascar cockroach in Indonesia, it is necessary to find out characteristic, especially production performance (consumption, body weight an body weight gain, feed conversion, and mortality) in Indonesian environment.
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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