Judul: Dampak Limbah Cair Perumahan Terhadap Lingkungan Perairan (Studi Kasus: Nirwana Estate, Cibinong dan Griya Depok Asri, Depok)
Abstrak: Physico-chemical and microbiological analyses of surface waters are important in assessing the impact of domestic and industrial activities on such water bodies. The aim of this research were to determine water quality cause of household wastewater, to know community perception about management of household wastewater, and to know willingness to pay of community for aquatic environmental management effort due to household wastewater. This research was conducted on Nirwana Estate, Cibinong and Griya Depok Asri, Depok. Water quality status was analyzed by pollution index, community perception by chisquare test, and willingness to pay by contingent valuation method (CVM). Water quality of Nirwana Estate was heavy polluted (UNECE, 1994), and low pollluted (Tchobanoglous and Burton, 1991; UNESCO/WHO/UNEP, 1992; Rump and Krist, 1992; PP No.82 tahun 2001) whereas water quality of Griya Depok Asri was middle polluted (UNECE, 1994) and low polluted (Tchobanoglous and Burton, 1991; UNESCO/WHO/UNEP, 1992; Rump and Krist, 1992; PP No.82 tahun 2001). Community perception about pollution of household wastewater was not correlation with decreasing of water quality. Willingness to pay for develop household wastewater management system in Nirwana Estate is Rp. 40.455 and Rp. 60.000 in Griya Depok Asri. The results of this study indicate that water quality of Nirwana Estate more polluted than Griya Depok Asri.
Keyword: 

Judul: Penifaian Jasa Lingkungan Air Minum dan Penentuen Prioriias Bantuan Perbaikan Lingkungan (Studi Kasus DAS Citarum, Jawa Barat)
Abstrak: Willingness of community at Citarum watershed to partidpate in improving environmental quality as an effort to reduce impact of dimate change was assessed based on their willingness to pay to environmentd sewices provided by upper watershed communities. Identification of activities that would reduce the involvement of upstream communities to do deforestation and assessment, of vulnerability of downstream communities to climate change was carried out through survey to. household. The illingness to pay was analyzed using Contingent Valuation Methd (CVM) and priority pwmm was analyzed using Analytical Hierarki Process (AHP). Based on CVM analysis it was indicated that the level of willingness of downstream communities to pay the compensation for the environmental sewices (0.g. drinking water) provided by upstream communities depended on their perception and understanding about the important of maintaining forest cover at the upper Citafum watershed and availability of drinking water. If the downstream communities living in the uhan areas often exposed to clean water scarcity problem during dry-season, their willingness to pay for the compensation tended to inmase. Further analysis found that the main factors that motivate mmuniiy to do deforestation at Upper Cirum watershed were to seek new land for agricutture activities and to increase their income. Majority of communities wanted to stop destructing the forest if they have alternative jobs for income generation.
Keyword: 

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf