Judul: Analisis Kultivasi Jamur Kuping (Auricularia sp.) pada Log Kayu dan Ranting Sengon, Jabon dan Jati
Abstrak: One of the alternative media for ear mushroom (Auricularia sp.) cultivation is by using cutting wastes of log and twigs. The objective of this research is to analyze the potency of ear mushroom cultivation by using log and twigs from three species e.g sengon (F. moluccana), jabon (A. cadamba) and jati (T. grandis). This research is completely randomized design with 8 treatments of logs and twigs from the trees species, baglog from sengon sawdust nutrition given (BIO) and sengon sawdust only (CS). Fresh weight of ear mushroom from jabon stem (171.4 g) was higher than other treatments, except BIO treatment (248.4 g). Biology efficiency (EB) of jabon twigs (39.8%) is significantly higher than the other treatments, except for BIO treatment (67.6 %). The average of harvesting time of teak log (36 days) and teak twigs (34 days) were significantly higher than the other treatments. The results clearly showed that log and twigs from that three species could be used for ear mushroom cultivation media to substitute the use of sawdust.
Keyword: T. grandis. Cultivation media, F. moluccana, Auricularia sp., A. cadamba

Judul: Cultivation of Two Edible Mushrooms on Wood and Branches of Sengon (Paraserianthes falcatraria), Moringa (Moringa oleifera), and Kicopong (Cecropia peltata) Branches., Cultivation of Two Edible Mushrooms on Wood and Branches of Sengon (Paraserianthes falcatraria), Moringa (Moringa oleifera), and Kicopong (Cecropia peltata) Branches.
Abstrak: Jamur tiram (Pleurotus ostreatus) dan jamur kuping (Auricularia auricula) termasuk jenis jamur pangan yang banyak dibudidayakan. Saat ini, dibandingkan jenis kayu sengon (Paraserianthes falcataria), kayu kelor (Moringa oleifera), dan kayu kicopong (Cecropia peltata) merupakan jenis kayu yang penggunaannya masih cukup rendah. Penelitian ini bertujuan menganalisis potensi kayu sengon, kelor, dan kicopong (batang dan ranting) untuk kultivasi jamur tiram dan jamur kuping. Penelitian menggunakan rancangan acak lengkap (RAL) dengan dua faktor yaitu jenis media dan jenis jamur. Jenis media adalah log dan ranting serta baglog sebagai pembanding. Hasil penelitian menunjukkan bahwa jamur yang dikultivasi pada media baglog memiliki hasil yang tertinggi dibanding log dan ranting. Jika dilihat dari media batang dan ranting, ketiga jenis kayu memiliki potensi yang baik sebagai media kultivasi jamur, dengan kicopong sebagai media terbaik. Hama dan penyakit yang cenderung mengganggu pertumbuhan kultivasi jamur adalah jenis Stemonitis sp. dan Corpinus sp., Oyster mushrooms (Pleurotus ostreatus) and ear mushrooms (Auricularia auricula) are among the most widely cultivated types of food mushrooms. At present, compared to sengon wood (Paraserianthes falcataria), kelor (Moringa oleifera), and kicopong (Cecropia peltata) wood are types of wood whose usage is still quite low. This study aims to analyze the potential of sengon, moringa, and kicopong (logs and twigs) wood for the cultivation of oyster mushrooms and ear mushrooms. The study used a completely randomized design (CRD) with two factors, namely the type of media and the type of fungus. Types of media are logs and branches and baglogs for comparison. The results showed that fungi cultivated on baglog media had the highest yield compared to fungi that were cultivated on logs and twigs. When viewed from the stem and twig media, the three types of wood have good potential as a medium for mushroom cultivation, with kicopong as the best medium. Pests and diseases that tend to interfere with the growth of fungal cultivation are Stemonitis sp. and Corpinus sp.
Keyword: Auricularia auricula, Cecropia peltata, Moringa oleifera, Paraserianthes falcataria, Pleurotus ostreatus

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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