Judul: Faktor-Faktor yang Mempengaruhi Keputusan Pembelian Petani dalam Memilih Benih Padi Bersertifkat PT SHS (Sang Hyang Seri) di Kabupaten Bogor
Abstrak: PT SHS is one of the companies that facing competition in the seed industry in Indonesia. The purpose of this research are: 1) to identify characteristics and decision-making process of purchasing seed certified by rice farmers, 2) to analyze the factors that influence the decision-making process of farmers, 3) determines the managerial strategy/marketing mix which right for the company. Based on interviews with 50 farmers selected by simple random sampling, shows that most of the farmers were middle-aged, with only past elementary school, own land holdings with an area of 0.8-3 hectares, and earn more than $ 9 million. The purchase decision making process by farmers based on their desire to obtain high rice iii productivity, information on certified seed retrieved most of the farmers through the stall saprotan, the main criteria into consideration in selecting the seed farmers rice is certified seed, and the seed quality that is certified is the most used by farmers is a brand of seeds from PT SHS, those purchasing is a done individually. Further analysis of the factors that affect farmers in the decision-making process of purchasing a certified padi seeds showed that the economic and the product is the most influences factor that affecting purchasing decisions by farmers where the primary variable of this factor is the quality of the seed. Therefore, the quality of the seed is a priority to be considered in order to win the competition.
Keyword: purchasing decision., consumer behavior, seed

Judul: Analisis faktor-faktor yang mempengaruhi keputusan petani dalam pemasaran gabah/beras : Kasus desa Mejasem, Tengeng Kulon, dan Yosorejo kecamatan Sragi Kabupaten Pekalongan Propinsi Jawa Tengah
Abstrak: Tercapainya swasembada beras di Indonesia tidak bisa terlepas dari peran petani yang bersedia menanam padi, serta mengadopsi teknologi dalam proses pertumbuhan produksi dan produktivitas. Agenda penting selanjutnya adalah bagaimana kesejahteraan petani itu dapat ditingkatkan. Untuk meningkatkan kesejahteraan petani tidak hanya masa- lah produksi dan produktivitas saja yang harus diperhatikan, melainkan juga masalah kualitas produk, pemasaran, serta diversifikasi, baik vertikal maupun horisontal. Usaha ini dapat dimulai dengan mempelajari perilaku ekonomi petani padi melalui faktor-faktor yang mempengaruhi keputusan petani. Penelitian bertujuan mempelajari faktor-faktor yang mempengaruhi keputusan petani padi dalam pilihan institusi pemasaran, waktu dan jumlah jual gabah, sehingga tergambar perilaku ekonomi petani. Mengetahui rantai pemasaran gabah/beras, serta mempelajari posisi tawar petani padi terhadap pedagang. Hasil penelitian menunjukkan bahwa seluruh petani memasarkan gabahnya ke pedagang, padahal KUD dan sebagian penggilingan juga bersedia melayani pemasaran gabah tersebut. Faktor utama petani memasarkan gabah ke pedagang adalah rendahnya biaya transportasi, karena transaksi jual beli dilakukan di sawah dan atau rumah petani.
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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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