Judul: Analisis Kualitas Pelayanan Koperasi Pertanian Langgeng Mulyo dalam Pengembangan Sistem Agribisnis Nenas Ngancar, Kabupaten Kediri
Abstrak: Increasing service quality of Langgeng Mulyo Agricultural Cooperative is needed to develop agribusiness system of pineapple in Ngancar. This study was aimed to explain the roles of Langgeng Mulyo Agricultural Cooperative in developing pineapple agribusiness in Ngancar Village and to measure the service quality of this cooperative. The main roles of Langgeng Mulyo Agricultural Cooperative are introducing a new variety of pineapple and helping farmer in finance. The results of SERVQUAL analysis showed that cooperative has not satisfied the members in every dimension of service quality whereas the biggest unsatisfaction was in emphaty dimension which attribute is moral and material support for the loss harvested pineapple farmers. However, the members are quite loyal to the cooperative although the cooperative has not fulfilled their expectations yet. Therefore, the Langgeng Mulyo Agriculture Cooperative is still needed in developing pineapple agribusiness and will be more effectively if its service quality be increased.
Keyword: service quality, pineapple agribusiness, cooperative

Judul: Penilaian Kualitas Pelayanan Koperasi Unit Desa Giri Tani dalam Pengembangan Agribisnis Sapi Perah Cisarua, Kabupaten Bogor.
Abstrak: Peningkatan kualitas jasa Koperasi Unit Desa Giri Tani diperlukan untuk mengembangkan sisitem agribisnis sapi perah. Tujuan penelitian ini adalah menganalisis peranan KUD Giri Tani dalam pengembangan agribisnis sapi perah di Kecamatan Cisarua dan mengukur kualitas pelayanan koperasi tersebut. Peranan utama dari koperasi adalah memasarkan produksi susu anggota ke industri pengolahan susu, membantu peternak dengan menyediakan layanan inseminasi buatan beserta kesehatan hewan, dan menyediakan pakan serta sarana produksi peternakan. Hasil analisis dengan menggunakan SERVQUAL menunjukkan bahwa koperasi belum dapat menyediakan pelayanan yang berkualitas kepada anggota pada semua dimensi kualitas jasa dengan tingkat indikasi pelayanan yang buruk terbesar pada dimensi daya tanggap (responsiveness) yakni pada atribut ketepatan pembayaran susu. Walaupun koperasi belum mampu memenuhi seluruh harapan anggota, mereka tetap memiliki kesetiaan pada koperasi. Oleh karena itu, keberadaan koperasi masih sangat dibutuhkan dalam pengembangan agribisnis sapi perah dan akan lebih efektif jika kualitas pelayanan ditingkatkan.
Keyword: agribisnis sapi perah, koperasi, kualitas pelayanan, servqual

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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