Judul: Efektivitas Kinerja dan Strategi Pengembangan Kelompok Tani Darma Bakti dalam Pengusahaan Beras Hitam di Kecamatan Cigudeg Kabupaten Bogor
Abstrak: Black rice is a food crops subsector’s commodity that need to be developed because the demand is continues increasing but the volume production is still in the low rate. Cigudeg is a subdistrict in Bogor regency that known as the producer of black rice. In Cigudeg subdistrict, black rice cultivated by Darma Bakti Farmers Group. The existence of these farmers group can help the black rice development in Bogor Regency if it has an effective performance and appropriate development strategies to be applied. The purposes of this research are to analyze Darma Bakti Farmers Group’s performance effectivity and to formulate appropriate alternative development strategies for Darma Bakti Farmers Group in black rice cultivation with strategic architectural approach. The result of this research shows that Darma Bakti Farmers Group has quite effective performance all this time. There are alternative strategies that obtained are build a continuous partner in the provision of inputs, marketing of products as well as research and development; increase the quality, quantity, and continuity of black rice production to meet demand; improve the capital availability; farmers group institutional strengthening; develop black rice products with available resource optimization to win the competition; develop products with continuous research and development; and creating trademark and certification as a guarantee of black rice products that produced. The entire alternative strategies can be implemented by Darma Bakti Farmers Group with timescales respectively based on a strategic architecture.
Keyword: Strategic Architecture., Performance, Farmers Group, Development Strategy, Black Rice

Judul: Strategi Pengembangan Pemasaran Beras Hitam di Kecamatan Jasinga
Abstrak: Beras hitam merupakan varietas lokal yang mengandung pigmen yang lebih baik dibandingkan beras putih. Kelompok Tani Parung Kembang (KTPK) adalah kelompok tani yang membudidayakan beras hitam di Kecamatan Jasinga, Kabupaten Bogor, Jawa Barat. Tujuan dari penelitian ini adalah: 1) mengidentifikasi lembaga, fungsi dan saluran pemasaran, 2) menganalisis efisiensi saluran pemasaran beras hitam melalui pendekatan marjin pemasaran, farmer’s share dan rasio keuntungan, 3) merumuskan alternatif strategi pengembangan pemasaran dengan alat analisis yaitu analisis hierarki proses. Observasi dan wawancara dilakukan kepada 19 petani yang tergabung dalam KTPK dengan purposive sampling dan 2 lembaga dengan metode snowball sampling. Metode analisis data yang digunakan dalam penelitian ini yaitu analisis deskriptif dan kuantitatif. Analisis deskriptif digunakan untuk mengetahui lembaga, fungsi dan saluran pemasaran beras hitam di Kecamatan Jasinga, sedangkan analisis kuantitatif digunakan untuk menghitung marjin pemasaran, farmer’s share, rasio keuntungan terhadap biaya dan anlisis hierarki proses. Hasil penelitian didapatkan tiga saluran pemasaran yang masing-masing terlibat dengan lembaga pemasaran yang berbeda. Saluran I relatif efisien menurut sudut pandang petani dibandingkan saluran lainnya. Saluran ini merupakan saluran terpendek yang tidak melibatkan lembaga perantara dengan harga jual Rp 15 000 per kg, farmer’s share tertinggi sebesar 100%. Fungsi-fungsi pemasaran yang dilakukan setiap lembaga pemasaran meliputi fungsi pertukaran, fungsi fisik dan fungsi fasilitas. Alternatif kebijakan yang diprioritaskan dalam pengembangan pemasaran beras hitam adalah indikator harga sebesar 0.345 dengan alternatif biaya pemasaran sebesar 0.528 (18.216%).
Keyword: srategi pengembangan, beras hitam, efisiensi pemasaran, analisis hierarki proses, kelompok tani parung kembang

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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