Judul: Analisis Teknoekonomi Bangunan Penangkap Mata Air (Broncaptering) di Desa Pamijahan, Kecamatan Pamijahan, Kabupaten Bogor
Abstrak: Desa Pamijahan belum memanfaatkan potensi mata air yang ada dengan efisien. Sementara itu, kebutuhan air bersih desa ini belum terpenuhi. Oleh karena itu, diperlukan perancangan sarana air bersih broncaptering. Penelitian ini bertujuan untuk menganalisis kelayakan rancangan broncaptering melalui analisis teknoekonomi. Analisis data mencakup beberapa aspek yaitu legalitas, manajemen operasional, teknis teknologis, dan finansial. Mata air yang digunakan berasal dari tepi Sungai Cigamean. Sarana air bersih dikelola oleh Badan Pengelola Sarana Air Bersih Desa Pamijahan. Pompa submersible 85S30-2 dan pipa jenis PVC digunakan dalam rancangan ini. Hasil rancangan sistem perpipaan transmisi dan distribusi, berdasarkan analisis dengan software Epanet, layak untuk diaplikasikan. Harga pokok produksi sebesar Rp1472/m3 dan harga jual Rp1800/m3. Berdasarkan analisis kriteria investasi (NPV, IRR, net B/C, dan PBP) dengan bunga 10%, rancangan broncaptering ini disimpulkan layak. Dari hasil analisis sensitivitas, kondisi kritis terjadi saat kenaikan biaya produksi 16% dan penurunan produksi 7%. Seluruh kriteria analisis menunjukkan bahwa pembangunan sarana air bersih berupa rancangan bangunan penangkap mata air layak untuk direalisasikan.
Keyword: air bersih, broncaptering, mata air, teknoekonomi

Judul: Analisis Ekonomi Pemanfaatan dan Pengembangan Sumberdaya Air (Studi Kasus: Kampung Cibereum Sunting, Kelurahan Mulyaharja, Kecamatan Bogor Selatan, Kota Bogor)
Abstrak: Water is the principal and essential resource for human life. The development of housing increase the competition of groundwater demand and leads to groundwater scarcity. The objectives of this research are to examine the characteristics of water resources user, to estimate the value of Willingness to Pay (WTP), to analyze the factor affect of WTP, and to examine feasibility of development clean water resservoir in Cibereum Sunting, Mulyaharja Village, South Bogor sub-district, Bogor City. This research used several analyses, such as descriptive, WTP, regression, and feasibility study. The results show that the characteristics of water users in Cibereum Sunting have revenue approximately Rp 1,000,001-Rp 2,000,000 per month, the amount of water needed are 3-4 m³/day/household, and number of water users are 5-6 person/household. The average value of WTP of water user is estimated Rp 149.05 per m³. The factors affect of WTP are age, revenue, and the amount of water needs. Based on the financial feasibility analysis for Net Present Value (NPV) is Rp 16,210,358.7; Net Benefit-Cost Ratio (Net B/C) is 1.18; and Internal Rate of Return (IRR) is 19%. Then, based on the economic feasibility analysis for NPV is Rp 38,839,914.09; Net B/C is 1.55; and IRR is 32%. It can be concluded that the development of clean water reservoir is feasible and important for continuous water supply for local people. The water resource optimal allocation policy must be established by government and stakeholders.
Keyword: Internal Rate of Return., Net Benefit-Cost Ratio, Net Present Value, Willingness to Pay, Water resource

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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