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: Analisis Willingness To Pay Masyarakat terhadap Pembayaran Jasa Lingkungan Mata Air Cirahab (Desa Curug Goong, Kecamatan Padarincang, Kabupaten Serang, Banten)
Abstrak: Water is one of important elements in human life. Water is also used for a variety of interest such as drinking, cooking, washing, and all other activities that directly relate to human walfare. The purpose of research is to determine the value of willingness to pay (WTP) for community economic instruments, namely payment environmental services, the factors that affect respondents’s willingness to do a payment environmental services and the factors that affect the value of preparedness. Willingness of respondents to pay for environmental services is influenced by several factors, such as the assessment of water quality, the amount of water needs, and the distance to the water source. The assessment of water quality impacts is significant at 90 percent, variable amount of water needs is significant at 95 percent, while variable distance to the water source is significant at 99 percent. WTP value in this research is the value that will be given by the respondents to environmental services generated by Cirahab spring per liter per household. Average WTP is Rp. 101/liter/household, while total WTP is Rp. 83.835/liter. The factors affecting the value of respondents’s WTP are influenced by the assessment of water quality, the amount of water need, the distance to the water source, and the average household income. The assessment of water quality impacts is significant at 90 percent, variable anount of water needs is significant at 95 percent, variable distance to water source is significant at 99 percent, and variable average household income is significant at 90 percent. Once established average WTP value per liter per household has been determined the potential value of water Cirahab spring is calculated by multiplying the average WTP value with the number of respondents environmental services utilization. The value of environmental services by community is around 51.887.305/liter/year that can be generated by 4,94 Ha of land through transfer benefit method. Land should be planted to absorp tree so that the quality water and quantity water of Cirahab spring be sustainable. The potential valus of Cirahab spring was obtained from the multiplication number of environmental services by community with average WTP value, so the potential value of Cirahab spring is Rp. 5.240.617.805/year which is more greater than the cost restoration of forest ecology is Rp. 544.758.500/Ha/year. Key words : water, payment environmental services, willingness to pay, transfer benefit, the cost restoration of forest ecology
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