Judul: Shrimps Caught by Set Net in Different Mangrove Conditions in the Estuary of Sungai Kakap, West Kalimantan
Abstrak: Mangrove ecosystem provides many benefits to local people both ecologically and economically. Unfortunately, the mangrove forest has been degraded, due to the increasing pressures of anthropogenic activities. Consequently, it would diminish most of the life supported by mangrove, and threaten the security of local people livelihood. This research was carried out to study the influence of mangrove plant conditions on shrimp catches in set nets and how this contribute to local management plan. The method applied for mangrove was transect line, and shrimps were collected with set net, and then they were related each other to analyze the influences. This study showed that links between mangrove plant conditions (area, density and coverage) and shrimp catch total and carapace length give positive regression. Significant positive correlations are shown by the relationship between percentage of mangrove area and number of Udang Ambai (Metapenaeus lysianassa) with 1.0-1.5 cm carapace length with a simple linear regression equation Y=23.5+0.3X (R²=0.62). The communities depend on mangroves and lives supported by them, though the people were not found very aware about ecology, functions, and threats of these resources. Therefore, the community involvement on the management of mangrove ecosystem and shrimp catch is required. Zoning through the participation of community is regarded as a major tool to achieve the goal of sustainable use of coastal resources.
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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: Sintesis dan pengukuran konduktivitas listrik, sifat termal, serta struktur konduktor superionik gelas AgBr-Ag2O-B2O3
Abstrak: Koncluktor superionik adalah padatan ionik yang mempunyai koncluktivitas listrik tinggi yaitu lebih besar dari 10-4 .0·1 cnf1, tetapi biasanya terjadi pada suhu yang tinggi. Pcneli:ian ini berlujuan untuk mensintesis clan memperoleh bahan konduktor superionik yang berbasis gelas (AgBr)., (Ag20-B20_1)1_, pacla suhu kamar, serta karakterisasi konduktivitas listrik, sifat tcrrnal dan perubahan stmktur dari sistem gclas terscbut. Konduktor superionik berbasis gclas (AgBr)x (Ag2O-B2O3)1.x dcngan x yang bcrvariasi yaitu 0,5; 0,7; dan 0,8 tclah disintcsis dcngan menggunakan teknik pendinginan ccpat. Carnpuran lcbunu1 AgBr dan Ag20-B203 didinginkan secara cepat dalam lingkungan nitrogen cair sehingga terbentuk (AgBrt (Ag20-B203)1_,. Pcngukuran konduktivilas listrik dilakukan pada berbagai komposisi x dcngan earn mcngukur tahanan listriknya dengan suhu yang bervariasi menggunakan mctoda ac yang mcnerapkan: prinsip jembatan Wheatstone. Untuk menganalisis sifat struktur digunakan difrnksi sinar-x, sedangkan pengukuran sifat tennal dari konduktor digunakan Differential 7'lierma/ Analysis. Hasil pengukuran mcnunjukkan bahwa konduktivitas listrik scnyawa (AgBr), (Ag20-B203)1• , naik dcngan pcnambahan garam AgBr pada sistem gelas Ag2O-B2O3 mcncapai nilai konduktivitas yang maksimum kcmudian nilai tcrsebut akan l\mm kemba!L Konduktivitas listrik yang optimum didapat pada komposisi x = 0,8, yaitu 9,12 · 10-6 n·1 cm-1 pada suhu kamar. Oleh sebab itu scnyawa (AgBr), (Ag20- B203)1.x bclum dapat digolongkan sebagai konduktor supcrionik pada suhu kamar. Namun scnymva tcrscbut dapat bcrlaku scbagai konduktor superionik jika suhu dinaikkan hingga 110°C dcngari konduktivitasnya 1,22 · 10··1 rr1 cnf1• Hasil analisis tcnnal untuk semua komposisi menunjukkan suhu transisi gelas sekitar l 75°C, scdangkan pola difraksi yang tcrjadi pada x = 0,5 dan x = 0,8 adalah kristalin, dan pada x = 0,7 rnempunyai polu amorf.
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