Judul: The Effect of Governance on Participation of Waste Bank Customers (Case : Adil Sejahtera Garbage Bank, Sidokumpul Village, Gresik District, East Java)
Abstrak: Tata kelola sampah merupakan proses atau cara individu, institusi, publik, dan swasta dalam menangani masalah sampah. Mewujudkan keberhasilan pengelolaan persampahan salah satunya diperlukan partisipasi dari nasabah bank sampah. Penelitian ini bertujuan untuk menganalisis sejauh mana pengaruh tata kelola bank sampah dapat memicu partisipasi komunitas dalam kegiatan bank sampah. Penelitian ini menggunakan pendekatan kuantitatif didukung kualitatif. Data kuantitatif diperoleh melalui survei lapang. Pengambilan sampel dilakukan secara sensus sebanyak 40 responden, yang terdaftar sebagai nasabah Bank Sampah Adil Sejahtera. Data kualitatif diperoleh melalui wawancara terhadap responden dan informan. Data kuantitatif diolah menggunakan Ms. Excel 2019 dan IBM SPSS Statistics 26, sedangkan data kualitatif melalui proses reduksi data, penyajian data, dan verifikasi data. Uji Regresi dilakukan antara variabel tingkat pengelolaan bank sampah dengan tingkat partisipasi nasabah, menggunakan uji regresi linear sederhana untuk mengukur pengaruh antar variabel. Hasil penelitian menunjukkan bahwa terdapat pengaruh signifikan tingkat pengelolaan bank sampah terhadap tingkat partisipasi nasabah Bank Sampah Adil Sejahtera.
Keyword: governance, participation, waste bank

Judul: Relation of Participation Level with Management  Effectiveness in the Waste Bank Program (Case: Bersih Indah dan Cantik Waste  Bank, Pasar Kemis District, Tangerang Regency, Provinsi Banten Province)
Abstrak: Bank sampah merupakan suatu sistem pengelolaan sampah kering secara kolektif yang dilakukan untuk mendorong masyarakat agar berpartisipasi secara aktif dalam pengelolaan sampah yang ada di lingkungan mereka. Pengelolaan sampah membutuhkan peran serta masyarakat baik dalam tahap pengambilan keputusan, tahap pelaksanaan, tahap menikmati hasil, dan tahap evaluasi. Tujuan penelitian ini adalah untuk menganalisis tingkat partisipasi dalam pengelolaan sampah dan faktor-faktor yang memengaruhinya, efektivitas pengelolaan sampah, serta hubungan tingkat partisipasi dengan efektivitas pengelolaan dalam program bank sampah. Metode yang digunakan dalam penelitian ini adalah metode survei dengan pendekatan kuantitatif yang didukung oleh data kualitatif melalui wawancara mendalam dan studi literatur. Hasil penelitian menunjukkan tingkat partisipasi berada pada kategori tinggi kecuali indikator tahap menikmati hasil dan evaluasi, sedangkan efektivitas pengelolaan sampah berada pada kategori sedang kecuali aspek kelembagaan. Terdapat hubungan ketersediaan sarana dan prasarana, ajakan teman atau anggota bank sampah dan tingkat dukungan keluarga dengan tingkat partisipasi. Terdapat hubungan tidak nyata pada indikator usia, tingkat pendidikan, dan tingkat pengetahuan, serta hubungan yang tidak nyata dan negatif pada indikator besar pendapatan dengan tingkat partisipasi. Terdapat hubungan nyata antara tingkat partisipasi dengan efektivitas pengelolaan sampah pada aspek kelembagaan, dan regulasi. Terdapat hubungan yang tidak nyata pada indikator aspek pembiayaan dan teknik operasional pengelolaan sampah., The waste bank is a collective dry waste management system which is conducted to encourage community to be active in managing the waste in their environment. Waste management involve community participation in the decision making stage, the implementation stage, the benefits stage, and the evaluation stage. The purpose of this research is to analyze the level of community participation in the waste management and the factors that influence it, the effectiveness of waste management, and also the relationship between the level of community participation and the effectiveness of management in the waste bank program. The method used in this research is a survey method with a quantitative approach supported by qualitative data through in-depth interviews and literature studies. The result showed that the level of community participation was in the high category, except for the indicators of benefit stage and evaluation stage. Meanwhile, the effectiveness of waste management is in the medium category, except for the institutional aspects. There is a relationship between the availability of facilities and infrastructure, the invitation of friends of waste bank members, and the level of family support with the level of community participation. There is also unsignificant relationship between the indicators of age, level of education, and the level of knowledge, as well as the unsignificant and negative relationship on the indicators the amount of income with the level of community participation. There is a relationship between the level of community participation with the effectiveness of the waste management in the aspect of institutional, and regulatory aspects. There is a unsignificant relationship on the indicators of the financing aspects and the operational techniques of waste management.
Keyword: bank sampah, tingkat partisipasi, pengelolaan sampah, participation level, waste bank, waste management

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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