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: Analysis of The Level of  Cooperative Member Satisfaction Toward The Services of Dairy Cattle Farmer  Cooperative Saluyu Kuningan West Java
Abstrak: A cooperative is a business institution that is based on kinship. Dairy cow farmers come together in cooperatives to achieve common goals together. Cooperatives have an obligation to serve their members. This study aims to analyze the level of member satisfaction toward the services of Dairy Cattle Farmer Cooperative Saluyu Kuningan, West Java. The methods used are gap analysis, Importance Performance Analysis (IPA), and Customer Satisfaction Index (CSI). The number of respondents in this study were 40 respondents from 565 total members of the cooperative. The results showed that there were 8 negative attributes in the gap analysis. IPA analysis shows 5 attributes that need more attention and a CSI value of 69.6% which indicates that members are satisfied with cooperative services., Koperasi merupakan salah satu lembaga usaha yang berasaskan kekeluargaan. Peternak sapi perah berhimpun dalam koperasi unutk mencapai tujuan bersama secara bersama-sama. Koperasi memiliki kewajiban dalam melayani anggotanya. Penelitian ini bertujuan untuk menganalisis tingkat kepuasan anggota terhadap pelayanan KPSP Saluyu Kuningan, Jawa Barat. Metode yang digunakan adalah analisis gap, Importance Performance Analysis (IPA), dan Costumer Satisfaction Index (CSI). Jumlah responden dalam penelitian ini yaitu 40 responden dari 565 total anggota koperasi. Hasil penelitian menunjukkan terdapat 8 atribut yang bernilai minus dalam analisis gap. Analisis IPA menunjukkan 5 atribut yang perlu diperhatikan lebih dan nilai CSI 69,6% yang menunjukkan anggota merasa puas terhadap pelayanan koperasi.
Keyword: Kepuasan Anggota, Koperasi, Pelayanan, cooperative, member satisfaction, service

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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