Judul: Studi Keanekaragaman & Kelimpahan Gastropoda Di Suaka Margasatwa Pulau Rambut, DKI Jakarta
Abstrak: Hutan mangrove memiliki fungsi ekonomis dan ekologis. Secara ekologis, hutan mangrove berfungsi sebagai tempat berlindung dan berkembang biak bagi berbagai jenis fauna serta sebagai mata rantai perputaran energi dan hara yang penting artiya bagi kehidupan alam hayati laut. Gastropoda merupakan salah satu komunitas moluska yang hidup di ekosistem mangrove dan memanfaatkan partikel serasah dari vegetasi mangrove sebagai sumber makanannya. Produktivitas serasah yang dihasilkan suatu hutan mangrove menentukan pula peningkatan populasi gastropoda yang ada. Akibat degradasi lahan dan kerusakan Iingkungan yang terjadi di pulau Rambut, pada sebagian hutan terdapat hutan mangrove dengan vegetasi yang terbuka selain hutan mangrove dengan vegetasi yang masih rapat. Hal ini dapat mempengaruhi karakteristik habitat hutan mangrove baik dari vegetasi maupun keanekaragaman moluska yang ada.
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Judul: Species Composition and Vegetation Structure of Mangrove Forest in Pulau Rambut Wildlife Reserve, Kepulauan Seribu, DKI Jakarta
Abstrak: Hutan mangrove di Suaka Margasatwa Pulau Rambut memiliki keanekaragaman hayati yang tinggi sehingga diperlukan penelitian mengenai komposisi jenis dan struktur vegetasi. Penelitian ini bertujuan untuk mengkaji komposisi jenis dan struktur vegetasi hutan mangrove di Suaka Margasatwa Pulau Rambut. Analisis vegetasi dilakukan dengan metode jalur dan garis berpetak dengan luasan plot contoh 8000 m2 dan berjumlah 8 jalur masing-masing dengan ukuran 10m x 100 m. Hasil penelitian menunjukkan bahwa hutan mangrove Suaka Margasatwa Pulau Rambut memiliki 9 jenis dari 5 famili dan didominasi oleh famili Rhizophoraceae. Jenis Rhizophora mucronata mendominasi pada tingkat pertumbuhan pohon dan semai. Jenis Ceriops tagal mendominasi pada tingkat pertumbuhan pancang. Nilai keanekaragaman, kekayaan, dan dominansi di hutan mangrove Suaka Margasatwa Pulau Rambut pada berbagai tingkat pertumbuhan tergolong rendah, namun nilai kemerataan jenisnya tergolong tinggi. Proporsi jumlah pohon dan permudaan membentuk kurva “J” terbalik. Stratifikasi tajuk pada hutan mangrove SM Pulau Rambut hanya mencapai stratum C (4-20 m)., Mangrove forest in Pulau Rambut Wildlife Reserve has high biodiversity, so research is needed on species composition and vegetation structure. This study aims to examine the composition of the type and structure of mangrove forest vegetation in the Pulau Rambut Wildlife Reserve. Vegetation analysis was carried out using the strip and line method with a sample plot area of 8000 m2 and a total of 8 lanes each with a size of 10 m x 100 m. The results showed that the mangrove forest of Pulau Rambut Wildlife Reserve has 9 species from 5 families and is dominated by the Rhizophoraceae family. The type of Rhizophora mucronata dominates the growth rate of trees and seedlings. The type of Ceriops tagal dominated the sapling growth rate. The value of diversity, richness, and dominance in the mangrove forest of the Pulau Rambut Wildlife Reserve at various growth rates is low, but the value of species evenness is high. The proportions of the number of trees and regeneration form an inverted “J” curve. The canopy stratification in the mangrove forest of Pulau Rambut Wildlife Reserve only reached stratum C (4-20 m).
Keyword: mangrove forest, Rambut Island, species composition, vegetation structure

Judul: Photosensor producing based on ferroelectric material of Ba0,5Sr0,5TiO3 doped by Ferrium Oxide (Fe2O3) on a P-Type Silicon Substate Si (100) applied as a digital camera with a single pixel image sensor
Abstrak: Thin film Ba0,5Sr0,5TiO3 (BST) doped with Fe2O3 was grown on p-type silicon substrate (100) using chemical solution deposition (CSD). It used the solvent 2-methoxyethanol with annealing temperature of 850°C and the doping treatment Fe2O3 of 2.5, 5, 7.5, 10 % of the mass formed BST. Pure BST had the highest absorption of 600 nm of light wavelength. Additions Fe2O3 moves highest absorption in the range of 560 nm. Fe2O3 addition was strengthening thin film sensitivity to the effects of light. In general, doping Fe2O3 10% was result the best absorbance and current-voltage of BST thin film. Electrical properties of thin films BST include dielectric, photoconductivity, and dissipation energy. Based on the current-voltage (I-V) analysis, pure BST and doped BST showed photodiode properties. Dielectric values obtained in the range from 23.32 to 243. Based on electrical conductivity data and energy dissipation, BST thin films have shown photodiode characteristics and are therefore suitable as light sensors. The image sensor in a digital camera is also a light sensor. This BST thin film has been scientifically proven to be a light sensor and also it can be applied as an image sensor. This is a novelty image sensor based on thin film Ba0.5Sr0.5TiO3.
Keyword: barium strontium titanate, thin film, photodiode, image sensor, digital camera