Judul: Pengaruh Serbuk Sengon, Daun Jati, dan Tandan Kosong Kelapa Sawit (TKKS) terhadap Kultivasi Jamur Tiram (Pleurotus spp.)
Abstrak: Jamur tiram (Pleurotus spp.) merupakan salah satu jenis jamur kayu yang banyak dikonsumsi masyarakat karena memiliki kandungan gizi yang tinggi. Limbah serbuk sengon, kelapa sawit dan serasah daun jati menjadi alternatif sebagai media tanam dalam kultivasi jamur tiram. Penelitian ini bertujuan mempelajari pertumbuhan dan produksi jamur tiram (Pleurotus spp.) pada media yang mengandung serbuk sengon, daun jati, dan Tandan Kosong Kelapa Sawit (TKKS). Metode yang digunakan adalah Rancangan Acak Lengkap Faktorial (RALF). Faktor pertama terdiri atas jamur tiram cokelat dan merah, faktor kedua terdiri atas 6 komposisi media. Hasil penelitian menunjukkan formula 2 (serbuk sengon 1860 g + daun jati 300 g) memberikan pengaruh terbaik pada fase vegetatif dengan rata-rata pertumbuhan miselium 0,75 cm/hari. Fase generatif paling baik dalam 2 kali panen diperoleh formula 4 (serbuk sengon dengan TKKS 1:2) yaitu 9 hari. Total bobot basah tertinggi diperoleh formula 4 yaitu 103,39 g dengan nilai efisiensi biologis 53,28%. Hama dan penyakit yang ditemukan adalah tungau, Collembola, dan Trichoderma sp. Kata kunci: budi daya, limbah, media, pertumbuhan, produktivitas ABSTRACT RIZAL LUL GODI. Effect of Sengon Powder, Teak Leaves, and Empty Bunches of Oil Palm (EBOP) on Cultivation Oyster Mushroom (Pleurotus spp.). Supervised by ELIS NINA HERLIYANA and LUFTHI RUSNIARSYAH. Oyster mushroom (Pleurotus spp.) is a type of wood mushroom that is widely consumed by the public because it has a high nutritional content. Waste of sengon powder, oil palm and teak leaf litter is an alternative as a growing medium in the cultivation of oyster mushrooms. This study aims to study the growth and production of oyster mushrooms (Pleurotus spp.) on media containing sengon powder, teak leaves, and Empty Bunches of Oil Palm (EBOP). The method used is the Factorial Complete Randomized Design (FCRD). The first factor consists of brown and red oyster mushrooms, the second factor consists of 6 media compositions. The results showed that formula 2 media (sengon powder 1860 g + teak leaves 300 g) had the best influence with an average growth of mycelium of 0,75 cm/day. The generative phase that requires the shortest harvest period in formula 4 media (sengon powder with EOPB 1:2) is 9 days. The highest total wet weight of the fungus was obtained in formula 4 media, which was 103,39 g with a biological efficiency value of 53,28%. Pests and diseases found are mites, Collembola, and Trichoderma sp. Keywords: cultivation, growth, media, productivity, waste
Keyword: ultivation, growth, media, productivity, waste

Judul: Growth and Production Of Oyster Mushroom (Pleurotus spp.) on Media Containing Sengon Wood, Coffee Skin, and Straw
Abstrak: Jamur tiram merupakan salah satu kelompok jamur kayu yang dapat dimakan (edible). Pemanfaatan limbah hasil kehutanan dan pertanian seperti serbuk gergaji kayu sengon, kulit kopi, dan jerami menjadi salah satu yang dapat dimanfaatkan sebagai media tanam dalam kultivasi jamur tiram guna memaksimalkan limbah yang ramah lingkungan. Penelitian bertujuan untuk menganalisis pengaruh media yang mengandung kayu sengon, kulit kopi, dan jerami terhadap pertumbuhan dan produksi jamur tiram. Penelitian menggunakan Rancangan Acak Lengkap (RAL) faktor tunggal dengan 3 perlakuan media yaitu formula 1 (kayu sengon dan kulit kopi), formula 2 (kayu sengon dan jerami), dan kontrol (kayu sengon). Hasil penelitian menunjukkan bahwa fase vegetatif jamur paling singkat diperoleh pada media formula 2 (15-18 hari). Fase generatif jamur yang membutuhkan waktu paling cepat masa panen diperoleh pada media kontrol (9-11 hari). Total bobot basah jamur terbesar dan nilai efisiensi biologis tertinggi diperoleh pada media kontrol (229,10 g) dengan nilai efisiensi biologis 79,0% pada jamur tiram putih (Pleurotus ostreatus) dan (331,70 g) pada jamur tiram cokelat (Pleurotus cystidiosus) dengan nilai efisiensi biologis 114,4%., Oyster mushroom is a group of edible wood mushrooms. Utilization of forestry and agricultural waste such as sawdust from sengon wood, coffee husks, and straw is one that can be used as a planting medium in oyster mushroom cultivation in order to maximize environmentally friendly waste. This study aims to analyze the effect of media containing sengon wood, coffee skin, and straw on the growth and production of oyster mushrooms. The study used a single factor completely randomized design (CRD) with 3 media treatments, namely formula 1 (sengon wood and coffee husk), formula 2 (sengon wood and straw), and control (sengon wood). The results showed that the shortest fungal vegetative phase was obtained in formula 2 media (15-18 days). The fungal generative phase wich required the fastest time to harvest was obtained in control media (9-11 days). The highest total wet weight of mushrooms and the highest biological efficiency value obtained on control media (229,10 g) with a biological efficiency value of 79,0% on white oyster mushroom (Pleurotus ostreatus) and (331,70 g) on brown oyster mushroom (Pleurotus cystidiosus) with a biological efficiency value of 114,4%.
Keyword: brown oyster mushroom, coffee husk, sengon wood, straw, white oyster mushroom.

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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