Judul: An Analytical Approximation to the Solution of RLW Equations in Surface Wave Problem.
Abstrak: Gelombang permukaan merupakan fenomena yang ditemui ketika mengamati permukaan air laut. Gerak gelombang permukaan dapat dijelaskan secara matematis dalam bentuk persamaan Regularized Long Wave (RLW). Persamaan RLW diselesaikan menggunakan perluasan metode perturbasi homotopi dan metode iterasi variasi. Dalam perluasan metode perturbasi homotopi, didefinisikan operator linear dan taklinear berdasarkan persamaan diferensial yang muncul pada persamaan RLW sedangkan dalam metode iterasi variasi, didefinisikan suatu fungsi koreksi. Grafik galat dari perluasan metode perturbasi homotopi dan metode iterasi variasi menunjukkan bahwa perluasan metode perturbasi homotopi memiliki galat yang lebih kecil dibandingkan dengan metode iterasi variasi.
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, RLW Equation, Optimal Homotopy Perturbation Method, Variational Iteration Method, Nonlinear Problem

Judul: Penyelesaian Masalah Gelombang Permukaan dengan Menggunakan Metode Perturbasi Homotopi
Abstrak: Surface wave is a phenomenon that is encountered at the sea surface. Generally, the motion of surface waves in three dimensions could be described mathematically in the form of Kadomtsev-Petviashvili (KP) equation. Kadomtsev-Petviashvili equation is solved using the homotopy perturbation method. In this method, the solution of the KP equation is assumed in the form of power series with the first term of the solution as the initial approach. The solution to the KP equation is studied using two initial approaches. Those are solitary wave solution and solutions in the form of rational functions. The solution of homotopy perturbation method is closed to the exact solution given by Drazin and Johnson (1989).
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Judul: Pengaruh Nikotin pada Gambaran Mikroskopis Pankreas Monyet Ekor Panjang (Macaca fascicularis) yang Diberi Pakan Berenergi Tinggi
Abstrak: Nicotine, in a low dosage, is expected to be used for health problems therapy such as obesity, hypertension, diabetes, heart disease, and other metabolic syndrome diseases. The aim of this study was to evaluate the microscopic changes of the pancreas in long tailed macaque which fed a high-energy diet with an oral intervention of nicotine. Twelve monkeys were devided into two groups based on nicotine and non nicotine treatment. Group with nicotine consisted of ten monkeys were further divided into two groups based on the type of diet. Each group consisted of five monkeys. The main content of diet A was tallow and diet B was commercial feed (monkey chow). Liquid nicotine intervention with a dosage of 0.75 mg/kg body weight were given every twelve hours for three months on both groups. While the non nicotine treatment was a negative control consisted of two monkeys were given diet B. All monkeys were under went to be euthanized by initially anesthetizing using ketamine HCl 10 mg/kg, intramuscularly. Microscopic samples were prepared based on the three pancreatic areas, caput, corpus, and cauda. They were stained with haematoxylin-eosin (HE) for standard staining, and Congo red to evaluated amyloid accumulation on the pancreatic islet. Data were analyzed descriptively and the microscopic findings showed that there were hydropic and lipid degeneration in all treatment and control groups as well as mild inflammation in one of the animals and no evidence of amyloid accumulation. As the conclution that nicotine oral administration on monkeys which fed high energy diets gave no difference in pancreatic microscopic finding amongs the groups
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