Judul: Analisis Tingkat Partisipasi Anggota Koperasi Peternak Sapi Bandung Utara (KPSBU) Jabar
Abstrak: The role of cooperatives in economic development can be realized by exsisting their member active participations in every cooperative business activity which are benefit for improving welfare in the form of social and economic benefits. This study aims to analyze the level of member participation in the activities of North Bandung Cattle Breeder Cooperative (KPSBU) West Java. The method of analysis used was the Spearman Rank analysis which determined the relationship between the cooperative’s socio-economic benefits and its member participation level. The results showed that the relationship between social-economic benefits and member participation level in the fields of organization, business and capital had a strong relationship or moderately high association. The strongest relationship which was seen between the social-economic benefits and the member participation level was the relationship in a field of organization, especially the members’attendant in annual member meeting (RAT). The perceived social benefits are the relations of good cooperation between executive board members in terms of service and the fulfillment of the requirements for breeders. While the economic benefits perceived is the guarantee marketing milk and additional income after being a member (KPSBU) West Java.
Keyword: Participation, Socio-economic benefits, Cooperative

Judul: Analisis Kinerja Dan Partisipasi Anggota Koperasi Peternak Kelinci (KOPNAKCI) Kabupaten Bogor
Abstrak: Cooperative is a social-economic institution which has purpose to improve its member welfare. The cooperative success indicator can be seen from its success in conducting its organization and business activities. Cooperative of Rabbit Breeder (KOPNAKCI) is one of agricultural cooperative of which members are the rabbit breeders in Bogor Regency and has been successful in running both its organization and business activities due to the indicators of increasing the number of members, developing the capital from members, and rising the profit and sale volume. This study aimed to analyze the performance and member participation level in the activities of Rabbit Breeder Cooperative (KOPNAKCI) in Bogor Regency, West Java, and to know how far the cooperative progress has been achieved. The performance and member participation level of the cooperative in the form of primary and secondary data were analyzed by using quantitative method through Rank Spearman Correlation Test based on vision indicator, capacity, networking, and resources. The results of data analysis was known that the cooperative performance was in good condition. And through Rank Spearman Correlation Test, it was obtained that there was in line-relationship between economic benefit with the member participation level, capital, and business activity.
Keyword: Rabbits, Performance and Participation Analysis, Cooperative

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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