Judul: Kontribusi Bahan Organik dari Mangrove Api-api (Avicennia marina) sebagai Bahan Evaluasi Pengelolaan Ekosistem Mangrove (Studi Kasus Kecamatan Labuhan Maringgai Kabupaten Lampung Timur)
Abstrak: The purpose of this study was to determine the potential contribution of organic matter (C, N and P) of mangrove forest litter production in Labuhan Maringgai to marine environment as well as evaluating the mangrove rehabilitation program conducted by the University of Lampung, Lampung program Mangrove Center. Lampung Mangrove Centre providing litter productivity of 4.53 g/m2/day with the biggest contributor from leaf litter and twigs, while flowers and fruit not found. Dry weight of the remaining mangrove leaf litter on day 56 ranged between 5-2.5 g. Lampung Mangrove Centre has the potential production of organic material that can be used litter amounted to 0.76164 GC/m2/day; 0.00628 GN/m2/day; 0.00331 GP/m2/day. Mangrove rehabilitation that involves three parties including the Government of East Lampung regency, Lampung University and the community is very effective in conservation of mangrove forests in Lampung Mangrove Centre with an area of 1000 ha of mangrove ranges.
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Judul: Produktifitas serasah mangrove dan potensi kontribusi unsur hara di perairan mangrove Pulau Panjang Banten
Abstrak: As a transition zone between land and sea, coastal zone is inhabited by various ecosystems, such as mangrove ecosystem. Mangrove ecosystem is considered for its ecological importance. The objective of this research was to investigate the characteristic of mangroves habitat based on water quality parameters, to determine productivity and leaves decomposition rate of litterfall, and to study nutrients (C, N, P) contribution potency of litterfall production in Panjang Island, Banten. This study was carried out in the mangrove forest, Panjang Island, Banten Province, from April to June 2010 using vegetation analysis, litterfall decomposition rate analysis and nutrients production of litterfall analysis. Principal Component Analysis was performed to analyse water chemical physical parameters. Data were collected using direct measurement and sampling in the field then followed by laboratory analyses. Results showed that contribution of one principal component to total diversity was 32.81%, 2 principal components were 55.01% and 3 principal components were 75.74%. Mangrove in Panjang Island produced a litterfall productivity average of 0.346 gram/m2/day. It exhibited the productivity of mangrove in Panjang Island is slightly lower than other mangrove forests due to low density and young plantation. The nutrient contribution potency of litterfall (C, N, and P) respectively were 0.528 g-C/m2/day; 0.00353 g-N/m2/day and 0.00076 g-P/m2 /day.
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Judul: Solusi Geometri Schwarzschild untuk Dimensi 4+1 dengan Invarian Rotasi Isotropik
Abstrak: Metrik Schwarzschild merupakan solusi eksak pertama dari persamaan medan Einstein dengan mangasumsikan metrik statik dan simetris. Metrik Schwarzschild yang ditemukan oleh Karl Schwarzschild masih dalam dimensi 3+1, namun seiring dengan teori-teori terbaru yang menunjukkan bahwa alam semesta tidak hanya di dimensi 3+1. Maka melalui penambahan dimensi, tujuan penelitian ini memperoleh solusi pada geometri Schwarzschild untuk dimensi 4+1 dengan memodifikasi koordinat bola yang invarian rotasi isotropik dan melalui penurunan rumus seperti koordinat bola, simbol Christoffel, dan tensor Ricci. Selain mendapatkan solusi ini, metrik Schwarzschild dimensi 4+1 dapat digunakan sebagai metrik dasar untuk memperoleh solusi blackhole dan wormhole pada dimensi 4+1. Hasil akhirnya, dengan memanfaatkan modifikasi koordinat bola, metrik Schwarzschild dapat dibentuk sehingga diperoleh solusi geometri Schwarzschild untuk dimensi 4+1.
Keyword: metrik Schwarzschild, persamaan medan Einstein, modifikasi koordinat bola, penambahan dimensi, invarian rotasi isotropik