Judul: Comparative Analysis of Final Disposal  Economic Feasibility with Sanitary Landfill and Open Dumping Methods (Case  Study: TPA Muara Fajar, Pekanbaru City, Riau Province)
Abstrak: Tempat Pembuangan Akhir (TPA) Muara Fajar merupakan satu-satunya TPA yang berada di Kota Pekanbaru. Peningkatan jumlah penduduk menyebabkan volume sampah yang diangkut ke TPA Muara Fajar juga turut meningkat. Peningkatan volume sampah tersebut mengakibatkan daya tampung TPA menjadi penuh sehingga pada tahun 2019 dilakukan pemindahan lokasi pembuangan sampah ke TPA Muara Fajar II yang diikuti pula dengan berubahnya metode pengelolaan sampah yang diterapkan, dari sanitary landfill menjadi open dumping. Tujuan dari penelitian ini adalah (1) mengidentifikasi kendala yang dihadapi TPA Muara Fajar II untuk beralih dari metode open dumping menjadi sanitary landfill, (2) mengestimasi perbedaan biaya dan manfaat dari pengelolaan sampah di TPA Muara Fajar I dengan metode sanitary landfill dan TPA Muara Fajar II dengan metode open dumping. Penelitian ini menggunakan metode analisis deskriptif dan Extended Cost and Benefit Analysis (ECBA). Hasil penelitian menunjukkan bahwa pengembalian metode pengelolaan sampah terkendala kebutuhan lahan, ketersediaan alat berat, tenaga kerja serta izin masyarakat. Hasil analisis ECBA menunjukkan bahwa kedua metode pengelolaan yang pernah diterapkan layak secara ekonomi, akan tetapi sanitary landfill memiliki net benefit yang lebih besar., Muara Fajar Final Disposal Site (TPA) is the only landfill in Pekanbaru City. The increase in population causes the volume of waste transported to TPA Muara Fajar also increase. The increase in the volume of waste resulted in the full capacity of the TPA so that in 2019 the location of waste disposal was moved to TPA Muara Fajar II, which was also followed by a change in the applied waste management method, from sanitary landfill to open dumping. This study aims to (1) identify the obstacles faced by TPA Muara Fajar II to switch from the open dumping method to sanitary landfill, (2) estimate the differences in costs and benefits of waste management at TPA Muara Fajar I with the sanitary landfill method and TPA Muara Fajar II with the open dumping method. The methods used in this study are descriptive analysis and Extended Cost and Benefit Analysis (ECBA). The results showed that the return of the waste management method was constrained by land requirements, availability of heavy equipment, labor and community permits. The results of the ECBA analysis show that the two management methods that have been applied are economically feasible, but sanitary landfill has a greater net benefit.
Keyword: Capacity, Descriptive Analysis, Extended Cost and Benefit Analysis, Net Benefit, Waste Volume

Judul: Impact Analysis and Optimization Strategy of Waste Management of TPST Babakan Sari, Bandung City
Abstrak: Kota Bandung adalah kota besar ke empat di Indonesia yang juga tidak terlepas dari masalah krusial terkait timbulan sampah. Saat ini, Tempat Pembuangan Akhir (TPA) Kota Bandung sudah mengalami kelebihan kapasitas timbulan sampah yang dapat ditampung. Pemerintah berupaya mengatasinya dengan menggalakkan prinsip Reduce, Reuse, Recycle (3R) dan pembentukkan Tempat Pengolahan Sampah Terpadu (TPST). Pembentukkan TPS Terpadu dapat membantu meminimalkan sampah dari sumbernya. TPS Terpadu Babakan Sari merupakan salah satu TPS percontohan tetapi masih belum optimal dalam implementasinya. Penelitian ini memiliki tujuan untuk menganalisis persepsi dan keterlibatan masyarakat terkait keberadaan TPST Babakan Sari; mengidentifikasi dampak yang dirasakan masyarakat dengan keberadaan TPST Babakan Sari; dan merumuskan strategi optimalisasi pengelolaan TPST. Metode dalam penelitian ini adalah analisis deskriptif kualitatif dan kuantitatif, analisis biaya angkut dan retribusi, dan Analythical Hierarchy Process (AHP). Hasil penelitian menunjukkan bahwa persepsi masyarakat terhadap keberadaan TPST baik namun keterlibatan masyarakat masih perlu ditingkatkan, Keberadaan TPST memiliki dampak yang belum optimal terhadap aspek sosial dan lingkungan berupa pengurangan beban sampah organik ke TPA sebesar 9,7%, dampak ekonomi berupa penghematan biaya angkut sebesar 4,4% dan retribusi masyarakat sebesar 4,4%, strategi optimalisasi pengelolaan sampah TPST Babakan Sari yang dapat dilakukan yaitu pada kriteria pelaksanaan 0,496 dengan prioritas alternatif kebijakan meningkatkan pemahaman pengelolaan sampah 0,279., Bandung City is the fourth-largest city in Indonesia has also facing a crucial problem of solid waste generation. The Bandung City landfills (TPA) is already experiencing excess capacity. Nowadays, the government is trying to overcome the problem by promoting the (Reduce, Reuse, Recycle) 3R principles and the establishment of Temporary Integrated Waste Processing Site (TPST). The establishment of TPST can help minimize waste from its source. The Babakan Sari Integrated TPS is one of the pilot TPS but its implementation is still not optimal. This study aims to analyze the perception and involvement of the community regarding the existence of the Babakan Sari TPST, to identify the impact of the TPST, and to formulate a strategy for optimizing the management of the TPST. The methods used are descriptive qualitative and quantitative analysis, cost analysis of transportation costs and waste retribution, and Analytical Hierarchy Process (AHP). The results showed that the community's perception of the existence of the TPST was good but community involvement still needed to be improved. The existence of the TPST has impact but not optimal, on the social and environment in the form of reducing the organic waste load to the landfills by 9.7%, the economic impact in the form of saving transportation costs by 4,4% and community retribution. by 4,4%, the optimization strategy for waste management at the Babakan Sari TPST that can be done is on the implementation criteria 0,496 with alternative policy priorities to increase understanding of waste management 0,279.
Keyword: Analythical Hierarchy Process, community perception, polluters pays principle, waste generation

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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