Judul: Struktur Populasi Udang Penaeid dan Keterkaitannya dengan Mangrove Tambak di Desa Jayamukti Kabupaten Subang
Abstrak: Kabupaten Subang memiliki mangrove sebagai habitat biota ekonomis penting, seperti udang penaeid. Penelitian ini bertujuan mengidentifikasi struktur populasi udang, mangrove tambak Desa Jayamukti-Subang, serta keterkaitan antara struktur mangrove dengan udang. Pengamatan mangrove dan sampling udang penaeid dilakukan di enam stasiun, dengan metode transek garis yang di dalamnya ada 3 petak contoh serta pengumpulan sampel udang penaeid dengan bubu. Parameter lingkungan yang diamati adalah suhu, salinitas, pH, DO, jenis dan kerapatan mangrove. Ada dua jenis mangrove dan tiga jenis udang yang ditemukan, dengan genus Metapenaeus lebih dominan. Ada korelasi erat untuk antara panjang karapas dengan berat udang, yang bersifat allometrik negatif. Penelitian ini mendapati bahwa kerapatan mangrove berkontribusi sebanyak 66% terhadap rata-rata ukuran panjang karapas udang, khususnya jenis Metapenaeus monoceros.
Keyword: Mangrove, Metapenaeus monoceros, Penaeus merguiensis, pond, Metapenaeus tenuipes

Judul: Kondisi Mangrove dan Struktur Komunitas Udang (Studi Kasus di Kecamatan Pasekan, Indramayu)
Abstrak: Mangrove is one of a group of plants in the tidal area. This study aims to describe community structure of shrimp with relation to mangroves. Research analyzed were species of shrimps in three different sub-habitats are ponds, river, and beaches in the Pabean Ilir and Pagirikan villages, Indramayu. Conditions measurzed include vast, density, and basal cover of mangroves and water quality. The results showed that the extent and mangrove density in the Pagirikan village lower than Pabean Ilir village. Environmental conditions in the two observation stations showed the results do not significant different and still in the range for survival of shrimp. There are eight species of shrimp during the observation, namely Penaeus merguiensis, P. japonicus, P. monodon, Acetes sp., Metapenaeus ensis, M. monoceros, Harphiosquilla raphidae, and M. rosenbergii. Diversity shrimps in the Pabean Ilir slightly higher than Pagirikan, however not significant. Community structure differences found between sub-habitat of ponds, river, and beaches from each of the two observation sites.
Keyword: Shrimp., P. merguiensis, Mangrove, Diversity, Indramayu

Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition