Judul: Faktor-Faktor Yang Mempengaruhi Keputusan Masyarakat menabung Sampah Serta Dampak Keberadan Bank Sampah Gemah Ripah (Kasus Masyarakat dusun badegan, Yogyakarta)
Abstrak: Indonesia is one of the most populated countries and it’s population has tendency to increase from time to time. This situation will cause the volume of garbage produced by population will as well. Waste management which consists of collecting, mobiling and throwing cause the disposal unit to be overwhelmed. Therefore, new garbage management is needed to change the old paradigm such as what the Dusun Bagedan citizens do, using Bank Sampah Gemah Ripah. This research aims to identify the mechanism pattern of garbage bank, analyze factors that determine citizen’s choice to saving garbage and analyze the impact of garbage bank existence. This research was carried in from March until May 2009. This research uses primary and secondary data. Primary data are collected by using questionnaire to 86 patriarch at Dusun badegan citizen using purposive sampling. Secondary data is collected by interviewing relevant informant. Mechanism pattern that is used by Bank Sampah Gemah Ripah is still very simple. It is formed based on the citizen’s aspiration and without any help from government institution. Garbage bank has two saving systems, individual and communal garbage system for anorganic garbage like paper, plastic and can. Individual customer will receive 85% from their saving while the rest for cash. Communal consumers (every RT) will receive 30% of the garbage that their saving and the rest also for the cash. Individual consumer either or communal can take the withdrawal once every three month. After analyzing data using Logistic regression, Statistically, factors that significantly detemine citizen choice to keep their garbage in saving bank are age factor that is 26-40 years old, family member, distance, kind of job, being a housewife, how active responden in a organization and also promotion. Based on respondent perception, social benefits of Bank Sampah Gemah Ripah among others are education or information about the importance of garbage management and it is experienced by 71 respondents. 69 respondents also experience the better change of garbage sevices system at their community. Based on McNemar analysis, the citizen’s behavior that is change are dispose garbage to the proper place, shifting house garbage, provide special rubbish bin at house. 58 respondent (67, 44%) experience the economical advantage of garbage bank. 76% respondent (88,37%) experience the decrease of garbage in their community. 9 respondent experience the bad impact of garbage bank. It’s because there are some garbage collectors who want to stead the garbages that make Dusun Badegan environment insecure.
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Judul: Factors Associated with Environmental, Economic  and Social Benefits of Waste Banks.
Abstrak: Bank sampah dipandang dapat menjadi salah satu solusi atas masalah sampah di Indonesia. Penelitian ini menjelaskan apakah karakteristik nasabah, tingkat kinerja pengurus dan tingkat partisipasi masyarakat merupakan faktor-faktor yang memiliki hubungan dengan manfaat yang dihasilkan bank sampah. Penelitian ini dilakukan di RW 01, Kelurahan Babakan, Kota Bogor dengan tujuan untuk menganalisis karakteristik nasabah, tingkat kinerja pengurus, tingkat partisipasi masyarakat dan manfaat yang dihasilkan bank sampah. Penelitian ini menggunakan metode campuran (mixed method). Metode kuantitatif menggunakan kuesioner sebagai alat pengumpul data dari 35 responden dan didukung dengan data kualitatif melalui observasi terlibat dan wawancara mendalam dengan informan kunci. Analisis data kuantitatif dengan menggunakan uji korelasi rank spearman mengindikasikan bahwa indikator tingkat pendidikan memiliki hubungan yang signifikan dengan indikator tahap perencanaan pada tingkat partisipasi masyarakat. Hasil uji korelasi juga menunjukkan bahwa tingkat kinerja pengurus memiliki hubungan yang signifikan dengan tingkat partisipasi masyarakat. Selain itu, tingkat partisipasi masyarakat memiliki hubungan yang signifikan dengan manfaat bank sampah, Waste banks are seen as a solution to the waste problem in Indonesia. This research explains whether customer characteristics, level of management performance and level of community participation are factors that are related to the benefits generated by waste banks. This research was conducted in RW 01, Babakan Village, Bogor City. This research uses mixed methods. The quantitative method uses a questionnaire as a data collection tool from 35 respondents. Quantitative data analysis indicates that the education level has a significant relationship with the planning stage on the community participation level. The correlation test show that the level of management performance has a significant relationship with the level of community participation. Apart from that, the level of community participation has a significant relationship with the benefits of waste banks.
Keyword: waste bank, waste bank management performance, waste bank benefits, community participations

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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