Judul: Gelombang soliter internal untuk fluida dengan rapat massa berupa fungsi eksponensial
Abstrak: Gelombang internal merupakan gelombang yang terjadi di bawah permuakan laut sehingga tidak terlihat secara kasat mata, tetapi dapat terdeteksi keberadaannya berdasarkan adanya pola tertentu di permukaan. Salah satuu gelombang internal yang banyak dikaji adalah gelombang soliter internal.
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Judul: Gelombang Soliter Internal pada Laut Dalam untuk Aliran yang Tunak
Abstrak: Gelombang internal adalah suatu gelombang yang terjadi di bawah permukaan air laut. Gelombang ini muncul karena adanya perbedaan rapat massa di setiap lapisan air laut. Salah satu gelombang internal yang memiliki sifat mempertahankan bentuk dan kecepatannya adalah gelombang soliter internal. Penelitian ini mengkaji gerak gelombang soliter internal pada laut dalam. Penurunan persamaan gerak gelombang internal pada laut dalam menggunakan asumsi bahwa aliran fluida berbentuk tunak. Dalam hal ini persamaan dasar fluida dinyatakan dalam formulasi Lagrange dengan ketinggian fluida dari posisi kesetimbangannya yang merupakan peubah Lagrangenya. Metode yang digunakan untuk menurunkan persamaan gerak gelombang internal adalah metode asimtotik. Dalam metode ini, simpangan gelombang internal dinyatakan dalam uraian asimtotik. Selanjutnya dengan menyeimbangkan faktor taklinear dan dispersi, maka diperoleh persamaan gerak gelombang berupa persamaan Benjamin-Ono (BO). Rumusan gelombang soliter internal dari persamaan BO digunakan untuk mengkaji gerak gelombang soliter pada fluida dua lapisan untuk laut dalam. Hasil yang diperoleh adalah profil gelombang soliter pada setiap kedalaman. Gelombang soliter internal yang memiliki amplitudo terbesar dicapai pada batas antara kedua lapisan fluida, sedangkan di permukaan gelombang relatif kecil.
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Judul: Evaluation of usage katuk (Sauropus Androgynus) and mulberry leaf meal (Morus Alba) On Productivity and physiology status of laying quail
Abstrak: Katuk leaf meal is considered as herbal medicine since it could improve the milk production in human as well as in animals. It also could increase the egg production as well as poultry performances. It also had been proved to increase vitamin A content in chicken liver and in the egg yolk. Murbei leaf meal also considered as herbal medicine. Some previous studies reported that murbei leaf, from some different species, contain moderate protein (15.7%-22.6%) and vitamin A content (5671-5736 mg%), these ranges were depending upon the different ages when the leaves were harvested and also the species of the murbei leaves. These researchs were conducted to evaluated the used of the two herbal leaves and its combination in the performances of Japanese quails (Coturnix coturnix japonica). The first experiment was to evaluated the effect of usage katuk leaf meal (10%) and mulberry leaf meal (10%) and its combination (5% katuk leaf meal + 5% mulberry leaf meal) in the diet based on rice bran (without yellow corn) on cholesterol, vitamin A, mineral Fe and Zn content in quail’s egg, meat and liver; as well as egg quality and production. The result showed that the lowest cholesterol content in the egg yolk, carcass, liver, were found from the quails fed diet containing the combination of katuk leaves meal and murbei leaves meal (R3). The cholesterol content were 349.606 mg 100g-1, 30.005 mg 100g-1, and 162.151 mg 100g-1 respectively. The content of egg’s vitamin A (336.65 μg 100g-1), meat (186.28 μg 100g-1) and liver (262.86 μg 100g-1); the content of egg’s mineral Fe and Zn (89.88 and 113.04 ppm) and quail’s meat (89.12 and 68.81 ppm) , also egg yolk color score (7.00) were the best resulted from the quails fed diet containing 5% katuk leaf meal+5% mulberry leaf meal. In general the best performances were found to be the best from the quails fed diet containing the combination katuk leaves meal and murbei leaves meal The second experiment was conducted to evaluated the effect of usage katuk leaf meal (10%), mulberry leaf meal (10%) and its combination (5% katuk leaf meal+5% mulberry leaf meal) in the layer quail’s diet that used yellow corn (<50%) to quail’s performances and egg quality. The resulted showed that usage 10% katuk leaf meal in quail’s diet have the same egg production as control diet (without leaf meal), with the highest yolk color score (10.03) and yolk’s vitamin A content (2560.62 mg 100g-1). The quail fed diet with 10% katuk leaf meal reached 5% QD Production faster than other treatment. It was concluded that usage 10% katuk leaf meal and 10% mulberry leaf meal could increased yolk color score and yolk vitaminA content. The third experiment was conducted to evaluate quail’s tibia bone size and mineral content, also the quail’s blood profile, which fed 10% katuk leaf meaal, 10% mulberry leaf meal, or its combination (5% katuk leaf meal+5%mulberry leaf meal). The resulted showed that the bone diametre of quail fed diet with combination 5%katuk leaf meal +5%mulberry leaf meal shorter than other treatment. Bone mineral Ca
Keyword: katuk leaf meal, mulberry leaf meal, laying quail