Judul: Pengelolaan perkebunan sagu (Metroxylon spp) di PT. National Sago Prima, Selat Panjang, Riau: seleksi bibit sagu berdasarkan jenis, tinggi pohon induk dan bobot bibit sagu terhadap pertumbuhan bibit sagu di persemaian
Abstrak: Sago nursery is a special factor that performed during the internship activities at PT. National Sago Prima, Selat Panjang, Riau. The experiment was conducted to obtain information in a nursery on the effects of this type of sago, height of mother plant sago and weight of sucker. The type of sago used was spiny sago (S1) and sago without spiny (S2). Height of mother plant used was 3.3 m - 4.6 m (T1), 4.6 m - 6.6 m (T2), more than 6.6 m (T3) and mother plant that have been harvested (T4). Sucker Weight used was 0,5 kg – 1,5 kg (B1), 2 kg – 3 kg (B2) dan 3,5 kg – 4,5 kg (B3). The results shown sago without spiny is better than spiny sago, height of mother plant is not effect significantly and sucker weight 3,5 kg – 4,5 kg is better than two other sucker weight. During the internship activities, sago cultivation activities conducted to obtain primary data. Secondary data were obtained by conducting interviews, discussions and reading of literature contained in the company.
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Judul: Sago (Metroxylon sagu Rottb.) Agroforestry Design Based on Morphological Characters, Physical Environment and Productivity in National Siberut Park
Abstrak: Sagu (Metroxylon sagu Rottb.) merupakan tumbuhan penghasil pati tertinggi dengan kandungan karbohidrat 94 g per 100 g. Potensi sagu dapat mengatasi permasalahan kekurangan pangan nasional dan mengurangi ketergantungan masyarakat terhadap beras. Tujuan penelitian yaitu menganalisis karakter morfologi, fisik lingkungan dan produktivitas sagu untuk mendapatkan rancangan agroforestri sagu berkelanjutan di kawasan Taman Nasional Siberut. Metode yang digunakan yaitu observasi dan analisis vegetasi. Fisik lingkungan habitat sagu terbagi menjadi dua kategori lahan, yaitu lahan lembab dan lahan basah. Karakter morfologi sagu (ukuran, bentuk dan jumlah) lebih unggul di Kecamatan Siberut Utara. Sagu siap panen, umumnya memiliki tinggi batang 8-10 m. Produktivitas sagu di Kecamatan Siberut Utara dan Kecamatan Siberut Barat masing masing menghasilkan 16,88 ton/ha dan 14,69 ton/ha. Rancangan agroforestri berbasis sagu yang direkomendasikan menggunakan jarak tanam 10 x 10 m yang menghasilkan tegakan sagu ideal sekitar 100 pohon/ha/tahun. Tumbuhan pendukung agroforestri, antara lain pangan, obat, rotan manau serta ternak lebah dan ikan., Sago is the highest starch-producing plant with a carbohydrate content of 94 g per 100 g. Potential of sago can overcome the problem of national food shortages and reduce peoples dependence on rice. Purposes the study were to analyze of morphological characters, physical environment and productivity of sago to obtain a sustainable sago agroforestry design in the Siberut National Park area. Methodsused were observation and vegetation analysis. Physical environment of the sago habitat wasdivided into two categories of land, moist land and wetlands. Morphological characters of sago (size, shape and total) were superior in North Siberut District. Sago is ready to harvested, generally has a stem height of 8 - 10 m. Sago productivity in North Siberut and West Siberut sub-districts produced 16,88 tons/ha and 14,69 tons/ha. Recommended sago-based agroforestry designed uses a spacing of 10 x 10 m which produces an ideal sago stand of around 100 trees/ha/year. Supporting plants for agroforestry include food, medicine, manau rattan as well as beekeeping and fish.
Keyword: agroforestry, morphological characters, physical environment, productivity

Judul: Best Difference Equation Aproximation to Duffing 's Equation
Abstrak: Persamaan Duffing merupakan persamaan yang sering muncul sebagai model masalah sistem ayun mekanis atau pada masalah rangkaian listrik. Umumnya penyelesaian persamaan ini secara numerik memberikan hampiran dengan gala! yang tinggi, seperti dengan metode Runge-Kutta. Tulisan ini mengkonstruksi suatu persamaan beda untuk menghampiri persamaan Duffing tersebut. Penyelesaian dari persamaan beda ini melibatkan fungsi-fungsi eliptik Jacobi. Berdasarkan penyelesaian ini diperoleh basil bahwa penyelesaian hampirannya persis sama dengan penyelesaian analitiknya. Penyelesaian analitik yang diperolehjuga melibalkan fungsi-fungsi eliptik Jacobi.
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