Judul: Estimasi Willingness to pay masyarakat terhadap keberlanjutan pilot project PLTAL di Selat Nusa Penida, Bali
Abstrak: Electricity has becomes an important thing in human’s life. The Indonesia’s electricity main source of power is originates from fossils, a nonrenewable resources. The increase of power plant development in fueling electricity demand will have impact on decreasing fossil resources, therefore an alternative electric power originate from renewable resources are needed. One of the energy resource that can developed is ocean current energy. Nusa Penida strait is one of location Pembangkit Listrik Tenaga Arus Laut (PLTAL) pilot project installation with installed capacity ten kilowatt (KW). The presence of PLTAL have given light to 25 street lamps that installed in Toyopakeh village. This study aimed to (1) identify benefit which Toyopakeh village citizens perceived, (2) study the opportunity readiness to pay and estimate the value of willingness to pay citizens of Toyopakeh village, and (3) analize management scheme and PLTAL development in Nusa Penida strait. The economic and sosiocultural benefit perceived by Toyopakeh village citizens in the night are increasing works effectivity for seaweed strapper, shop opened over night, easier to moored jukung and speedboat, ship monitoring, load and unloading, fishing, and ashes disposal. The presence of PLTAL Nusa Penida had less environmental impact probability. Citizens with high income or low income had similar opportunity readiness. Citizens with high academic level had opportunity readiness 1.291 point more than not ready to pay. Based on Turnbull estimator distribution, the mean WTP value was at Rp 7.894,695 and Rp 10.641,891 range, whereas based on Spearmen-Karber calculation, mean WTP value was at Rp 11.768,293. Stakeholder which had been and can be participate directly or indirectly in the PLTAL management and development processes in Nusa Penida divided by 5 types, namely researchers, bureaucration, funding, developer and communities.
Keyword: Bogor Agricultural University, willingness to pay., PLTAL, ocean current energy, Nusa Penida strait

Judul: Analisis Penanganan Sedimentasi Pembangkit Listrik Tenaga Air (PLTA) Singkarak Melalui Pembayaran Jasa Lingkungan (Studi Kasus Desa Guguak Malalo, Kecamatan Batipuh Selatan, Kabupaten Tanah Datar, Sumatera Barat).
Abstrak: Mekanisme pembayaran jasa lingkungan (PES) merupakan suatu kegiatan yang dapat mengatasi permasalahan sedimentasi di Danau Singkarak. Tujuan penelitianadalah menganalisis sosial ekonomi masyarakat, identifikasi penyedia dan pemanfaat jasa lingkungan,Willingness to Accept, dan Willingness to Pay. Metode analisis data yang digunakan adalah analisis deskriptif kualitatif dan kuantitatif, Willingness to Accept, dan Willingness to Pay tanpa regresi. Hasil penelitian menunjukkan sebesar 16% dari populasi masyarakat danau singkarak dapat dinyatakan sejahtera, karena penerimaan masyarakat lebih besar dibandingkan dengan pengeluaran masyarakat. Pemanfaat dari jasa lingkungan adalah pihak PLTA Singkarak, sedangkan penyedia jasa lingkungan adalah masyarakat. Hasil dari WTA masyarakat dan WTP dari PLTA Singkarak dalam mekanime pembayaran jasa lingkungan sebesar Rp 1.450.000 per tahun atau Rp 2.900 per pohon untuk masyarakat yang bersedia menanam pohon di atas lahan miliknya sebanyak 500 pohon. Pada pembayaran jasa lingkungan pihak PLTA akan membayar kepada lembaga pengelola DAS Guguak Malalo agar dapat dibagikan kepada masyarakat yang sesuai dengan syarat dan ketentuan yang telah disepakati.
Keyword: PLTA Singkarak, Rekomendasi, Willingness to Accept (WTA), Willingness to Pay (WTP)

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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