Judul: Study on Land Suitability Evaluation for Upland Sugarcane on PT. Sumber Madu Bukari, Kabupaten Kendari.
Abstrak: Penanaman tebu di daerah Kendari mempakan salah satu dari upaya memperluas penanaman tebu di luar Jawa. Tujuan penelitian ini adalah (1) menemukan sifat-sifat tanah yang mempengaruhi pertumbuhan dan produksi serta menentukan kriteria klasifikasi kesesuaian lahan tebu lahan kering, (2) mengidentifikasi masalah pengembangan lebih lanjut tanaman tebu lahan kering serta menemukan pemecahannya. Penelitian ini dilaksanakan di areal PT Sumber Madu Bukari pada lokasi Aronggo dan Lamooso. Analisis tanah dilaksanakan di Laboratorium Unit Tanah Faperta Universitas Haluoleo (Unhalu) dan UPT Laboratorium Dasar Pusat Unhalu berlangsung mulai bulan Januari hingga Juni 2002. Metode yang digunakan adalah metode survei dengan pemilihan area sebagai sampel secara bebas sistematik yang menggunakan jarak observasi transek. Hasil penelitian menunjukkan bahwa (1) tingkat produksi berdasarkan hasil laporan perusahaan berbeda dengan hasil penelitian, bahwa lokasi A yang diprediksi ternyata memiliki produksi yang lebih tinggi di banding lokasi L, (2) Sifat kimia (kandungan P2O5 tanah) dan sifat fisik tanah terutama kandungan air tanah pada kapasitas lapang dan pori drainase secara umum dapat dipergunakan sebagai indikasi terhadap pertumbuhan dan produksi tebu di semua area sampel dan lapisan tanah, (3) Berdasarkan hasil kriteria klasifikasi CSR/FAO staff bahwa seluruh unit lahan berada pada kelas N1 dan Sys seluruh unit lahan berada pada kelas kesesuaian S3 kecuali unit lahan 2 dan 4. Sedangkan berdasarkan B/C Ratio kelas yang terbentuk pada lokasi Arongo yaitu S1 (A-1), S2 (A-2), S3 (A-3), dan pada lokasi Lamooso seluruh unit lahan berada pada kelas N , (4) Faktor-faktor karakteristik lahan penentu produksi tebu lahan kering khususnya di Kabupaten Kendari berdasarkan data hasil analisis yaitu sifat fisik tanah (Permeabilitas, tekstur, dan pori drainase cepat), sifat kimia (C-organik dan (P2O5), kelima peubah tersebut C-organik memiliki pengaruh langsung dan pengaruh total yang besar terhadap produksi, (5) Modifikasi kriteria kesesuaian lahan berdasarkan dari pendekatan klasifikasi yang ada di Kabupaten kendari dilakukan dengan kualitas lahan berupa ketersediaan air (curah hujan 10 hari), media perakaran (kedalaman efektif), retensi hara (KTK tanah dan C-organik), toksisitas (kejenuhan Al), hara tersedia (N, P dan K), terrain (lereng), tingkat bahaya erosi dan bahaya banjir dan (6) Berdasarkan survei di lapangan dan analisis data yang telah dilakukan ditemukan delapan masalah utama di perkebunan PT. SMB yaitu (a) iklim, (b) lahan, (c) tata letak dan jalan kebun, (d) tebang dan angkut, (e) sumber daya manusia, (f) manajemen, (g) sosial dan budaya dan (h) hama tebu., National sugar need which cannot be fulfilled by in country productivity has led to a big sugar import which ultimately compete the local farmer's sugar prices. This is because local farmer cost of productivity are still higher due to production nefficiency. In line with improving the efficiency the govemment extended sugar planting areas particularly in the islands out side Java. Sugarcane planting in Kendari area is part of the effort just mentioned. To realize the efficiency of the sugarcane planting in this new areas researches must be carried out. The objectives of this research are: (1) To identify soil characteristics which influence sugarcane growth and productivity so that enable to set criteria for land suitability classification; (2) To identify problems related with developing further upland sugarcane at PT Sumber
Keyword: Sugar cane, Land Suitability, productivity

Judul: Pengelolaan Tanaman Tebu (Saccharum officinarum L.) di Pabrik Gula Madukismo, PT. Madubaru, Yogyakarta: dengan Aspek Khusus Mempelajari Produktivitas Tiap Kategori Tanaman
Abstrak: The study of the productivity of the various categories of sugarcane held in the Madukismo Millsworking area, Madubaru Company, Yogyakarta. This activity began in February 13 to May 14, 2012. The sample is taken at Sleman and Bantul district. The method used is the direct field observation, data from the division of plant productivity, as well as interviews with farmers. The results obtained on the productivity of down land is higher than up land. Differences in land characteristics influence the productivity of sugarcane. In addition, the downland productivity tended to decrease from the plant cane (PC) to ratoon crop (RC) in each subsequent season. For up land, there is higher productivity at ratoon cane I (RC 1) increase from low productivity in the plant cane (PC) and then back on every ratoon crop the following season. To overcome the low productivity of ratoon sugarcane needed to do the loading or replanting, or ratoon intensif nurse.
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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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