Judul: Redesign of Municipal Solid Waste Treatment Plant (MSWTP) Cibadak 1 in Tanah Sareal Subdistrict, Bogor
Abstrak: Permasalahan yang dihadapi Indonesia khususnya Kota Bogor dalam pengelolaan sampah yaitu semakin meningkatnya timbulan sampah seiring dengan bertambahnya jumlah penduduk. Upaya untuk mengurangi timbulan sampah adalah dengan dibangunnya TPS 3R, salah satunya TPS 3R Cibadak 1. Namun, TPS 3R ini fungsinya masih belum maksimal dalam mengurangi sampah. Oleh karena itu, penelitian ini bertujuan untuk melakukan perencanaan redesain TPS 3R agar sesuai dengan persyaratan yang berlaku. Metode pengambilan sampel sampah mengacu pada SNI 19-3694-1994 dan redesain TPS 3R berdasarkan Petunjuk Teknis TPS 3R 2021. Hasil perhitungan timbulan sampah eksisting pada tahun 2023 sebesar 886,62 kg/hari yang diperkirakan dalam sepuluh tahun kedepan akan meningkat menjadi 990,10 kg/hari dengan komposisi sampah terbesar yaitu sampah organik sebesar 68%. Potensi daur ulang sampah yang dapat diolah sebesar 66%. Kebutuhan lahan untuk perencanaan redesain TPS 3R ini diperluas menjadi 300 m2 yang awalnya 225 m2 dengan total RAB yang dibutuhkan sebesar Rp. 630.444.000,00., The waste management issue faced in Indonesia, particularly in Bogor City is the increasing waste generation alongside the growing population. The ways to reduce waste generation is the establishment of the Municipal Solid Waste Treatment Plant (MSWTP), one of which is MSWTP Cibadak 1. However, MSWTP is still not optimal in reducing waste. Therefore, this study aims to redesign the MSWTP was conducted according to comply with the applicable requirements. The waste sample method used SNI 19-3964-1994 and the design of MSWTP based on technical guidance of TPS 3R 2021. The results of the calculation of existing waste generation in 2023 are 886.62 kg/day which is estimated in the next ten years will increase to 990.10 kg/day, with the largest composition being organic waste by 68%. The potential for recycled waste that can be processed is 66%. The area initially 225 m2 becomes 300 m2 for the redesign of MSWTP, with a total budget plan of Rp. 630.444.000,00.
Keyword: budget estimate plan, MSWTP, redesign, waste

Judul: Design of TPS 3R in Bulumanis Kidul Village, Margoyoso District, Pati Regency
Abstrak: Permasalahan persampahan terjadi pada Desa Bulumanis Kidul sehingga pemerintah desa mengadakan pengelolaan sampah, tetapi masih belum berjalan dengan efektif. Penelitian ini bertujuan merencanakan sistem pengelolaan sampah dari sumber hingga TPS 3R. Penelitian menggunakan metode kuantitatif. Hasil pengukuran timbulan sampah sebesar 2,25 L/jiwa.hari dengan komposisi berdasarkan massa meliputi sampah organik sebesar 55,49%, kertas 9,77 %, plastik 19,50%, botol plastik 4,20%, kain 0,87%, kayu 2,42%, kaca 0,9%, diaper 5,50%, logam 0,6% dan lain-lain 0,75%. Pewadahan sampah direncanakan individual dengan dibagi dua yaitu organik dan anorganik. Wadah sampah perumahan memiliki volume sebesar 30 L, musala 20 L, masjid 40 L, kantor 40 L dan sekolah dibagi menjadi empat dengan masing-masing 30 L. Pengumpulan sampah digunakan sistem individual tidak langsung dengan periodisasi tiga hari sekali dan ritasi 3 kali/hari. TPS 3R direncanakan memiliki ruang pemilahan, penampungan sampah anorganik, pencacahan, pengolahan sampah organik, kontainer residu, ruang pengelola, dan toilet dengan rencana anggaran biaya Rp433.775.651,00., The problem of solid waste occurs in Bulumanis Kidul Village so that the village government organizes waste management, but it is still not running effectively. This study aims to plan a waste management system from source to TPS 3R. The research uses quantitative methods. The results of the measurement of waste generation are 2,25 L/person.day with a composition based on mass including 55,49% organic waste, 9,77% paper, 19,50% plastic, 4,20% plastic bottles, 0,87% cloth, wood 2,42%, glass 0,89%, diaper 5,50%, metal 0,6% and others 0,75%. The waste container is planned individually and divided into two, namely organic and inorganic. Residential waste containers have a volume of 30 L, prayer rooms 20 L, mosques 40 L, offices 40 L and schools are divided into four with 30 L each. Waste collection is used an indirect individual system with a periodization of once every three days and recitation 3 times/day. TPS 3R is planned to have a sorting room, storage of inorganic waste, enumeration, processing of organic waste, residue containers, management room, and toilets with a planned budget of 433.775.651,00 IDR.
Keyword: waste composition, waste management, waste generation

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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