Judul: Analisis Manfaat  Ekonomi dan Tingkat Partisipasi Pengelola Sampah Rumah Tangga di Kabupaten  Bogor (Kasus: TPS 3R “Green Altari”)
Abstrak: Jumlah penduduk Indonesia yang cenderung meningkat menyebabkan permasalahan sampah menjadi lebih kompleks. Pemerintah Kabupaten Bogor mendirikan Tempat Pengelolaan Sampah (TPS) 3R Green Altari sebagai suatu inovasi dalam pengelolaan sampah lingkup masyarakat. Tujuan penelitian ini adalah (1) menganalisis manfaat ekonomi dari pengelolaan sampah di TPS 3R Green Altari, (2) menganalisis tingkat partisipasi pengelola sampah rumah tangga di TPS 3R Green Altari, (3) mengidentifikasi faktor-faktor yang memengaruhi partisipasi pengelola TPS 3R Green Altari dalam pengelolaan sampah, dan (4) merekomendasikan strategi pengelolaan sampah di TPS 3R Green Altari. Metode analisis data yang digunakan adalah analisis pendapatan, benefit transfer, analisis deskriptif kuantitatif, analisis regresi linear berganda, dan analisis deskriptif kualitatif. Hasil penelitian menunjukkan total manfaat ekonomi pada skenario I sebesar Rp5.836.009,01 per tahun, pada skenario II sebesar Rp15.172.009,01 per tahun, dan pada skenario III manfaat ekonomi yang diperoleh adalah sebesar Rp312.015.517,11 per tahun. Rata-rata tingkat partisipasi pengelola TPS 3R Green Altari termasuk dalam kategori sedang dan hasil analisis regresi linier berganda menunjukkan bahwa faktor yang signifikan memengaruhi tingkat partisipasi pengelola pada taraf nyata 5% adalah ketersediaan waktu luang dan lama pendidikan. Rekomendasi strategi yang dapat dilakukan oleh TPS 3R Green Altari adalah dengan memerhatikan berbagai aspek mulai dari pembiayaan, kelembagaan, peraturan, sampai partisipasi dari setiap aktor., One of the causes of complex waste problems in Indonesia is the continuously increasing population. This study aimed to achieve the following objectives: (1) analyze the economic benefits of waste management at TPS 3R Green Altari, (2) analyze the level of staff participation at TPS 3R Green Altari. (3) identify factors influencing the participation of TPS 3R Green Altari staff in waste management, and (4) analyze effective waste management strategies at TPS 3R Green Altari. The data analysis methods employed included income analysis, benefit transfer, quantitative descriptive analysis, multiple linear regression analysis, and qualitative descriptive analysis. The research findings revealed that the economic benefits obtained in scenario I are IDR5.836.009,01 per year, while in scenario II, the economic benefits were IDR15.172.009,01 per year, and in scenario III, the economic benefits were IDR312.015.517,11 per year. The average level of participation among TPS 3R Green Altari staff is categorized as moderate. The results of multiple linear regression analysis indicated that the availability of free time and education were significant factors influencing the managers level of participation at a 5% significance level. The recommended strategy for TPS 3R Green Altari is to consider various aspects such as financing, institutional factors, regulations, and the involvement of all stakeholders.
Keyword: carbon reduction, income analysis, indirect benefits, management  scenarios, quantitative analysis

Judul: Estimated Value of Community’s Willingness to Pay to Contribute to TPS 3R Based Waste Management in Sidoarjo Regency
Abstrak: Peningkatan jumlah sampah berlebih (overload) di TPA Jabon Kabupaten Sidoarjo terjadi akibat jumlah timbulan sampah yang dihasilkan melebihi kapasitas TPA serta tingkat pelayanan dalam pengelolaan sampah lebih rendah dari keseluruhan timbulan sampah sehingga perlu dilakukan upaya penanganan dan pengurangan sampah yang dimulai dari sumbernya yaitu di tingkat rumah tangga. Pemerintah melalui Direktur Jendral Cipta Karya KPUPR menerapkan kebijakan program pengurangan sampah dari sumbernya melalui pengadaan TPS 3R. Berdasarkan hal tersebut, penelitian ini bertujuan untuk (1) menganalisis persepsi masyarakat serta pengelola terhadap pengelolaan sampah dan preferensi pengembangan TPS 3R di TPS Desa Ngampelsari Kabupaten Sidoarjo, (2) menganalisis faktor-faktor yang memengaruhi preferensi masyarakat dalam pemilahan sampah di tingkat rumah tangga, (3) mengestimasi nilai kesediaan (willingness to pay) masyarakat untuk berkontribusi dalam kegiatan operasional TPS 3R dan faktor-faktor yang memengaruhinya. Metode analisis yang digunakan dalam penelitian ini yaitu skala likert, Contingent Valuation Method (CVM), regresi logistik biner, dan regresi berganda. Hasil penelitian menunjukkan bahwa persepsi masyarakat serta pengelola terhadap pengelolaan sampah saat ini pada aspek sosial, lingkungan ekonomi masuk ke kategori penilaian setuju, dan pada aspek preferensi pengembangan TPS 3R masuk kategori penilaian sangat setuju. Faktor-faktor yang memengaruhi preferensi masyarakat dalam pemilahan sampah di tingkat rumah tangga secara signifikan ialah lamanya pendidikan, jumlah tanggungan keluarga, total pendapatan, pekerjaan istri, dan luas rumah. Nilai WTP yang digunakan sebesar Rp13.000 per KK per bulan untuk kebutuhan biaya operasional TPS 3R. Faktor-faktor yang memengaruhi secara signifikan terhadap kesediaan membayar masyarakat adalah variabel kesediaan memilah sampah, frekuensi memilah sampah (pernah memilah, selalu memilah), dan total pendapatan., The increase in the amount of excess waste (overload) in the TPA Jabon, Sidoarjo Regency occurs due to the amount of waste generated exceeding the capacity of the TPA and the level of service in waste management is lower than the overall waste generation, so it is necessary to make efforts to handle and reduce waste starting from its source, namely at the household level. The government through the Director General of Cipta Karya KPUPR introduced a policy of reducing waste at the source through the procurement of TPS 3R. Based on that, this study aims to (1) analyze the perception of the community and managers on waste management and preferences for the development of TPS 3R at TPS Ngampelsari Village, Sidoarjo Regency, (2) analyze the factors that influence the preference of the community in sorting waste at the household level, (3) estimating the value of the community willingness to pay to contribute to the operational activities of the TPS 3R and the factors that influence it. The analytical methods used in this research are likert scale, Contingent Valuation Method (CVM), binary logistic regression, and multiple regression. The results of the study indicate that the current perception of the community and management of waste management on the social, economic, and environmental aspects is in the category of agreeing assessment, and on the preference aspect, the development of TPS 3R is categorized as strongly agreed. The factors that significantly influence the preference of the community in sorting waste at the household level are the length of education, the number of dependents in the family,
Keyword: binary logistic regression, contingent valuation method, likert scale, operating cost

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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