Judul: Struktur Komunitas Lamun di Perairan Pagerungan, Jawa Timur.
Abstrak: Perairan Pagerungan terletak di Kepulauan Kangean, Jawa Timur. Pada perairan tersebut terdapat tiga ekosistem yang produktif yaitu mangrove, terumbu karang dan padang lamun. Ekosistem lamun merupakan salah satu ekosistem di laut dangkal yang mempunyai peranan penting dalam kehidupan biota laut dan merupakan salah satu ekosistem bahari yang paling produktif, sehingga mampu mendukung potensi sumberdaya yang tinggi pula. Seiring dengan meningkatnya aktivitas di daerah pesisir, telah memberikan tekanan terhadap ekosistem padang lamun. Di lain pihak walaupun sudah mengalami tekanan, namun penelitian tentang lamun masih sangat sedikit. Padahal informasi tersebut sangat penting untuk mene1aah pentingnya manfaat lamun dan pengelolaannya di masa yang akan datang. Penelitian ini bertujuan untuk mengetahui struktur komunitas lamun di perairan Pagerungan. Hasil penelitian ini diharapkan berguna sebagai infomasi dasar untuk lebih memahami fungsi dan faktor ekologis serta informasi dasar dalam pemanfaatan serta pengelolaan padang lamun. Disamping itu juga untuk melengkapi informasi tentang keberadaan lamun di Indonesia.
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Judul: Struktur Komunitas Lamun dan Kepadatan Perifiton pada Padang Lamun di Perairan Pesisir Nusa Lembongan, Kecamatan Nusa Penida, Propinsi Bali
Abstrak: Lamun ( seagrass) merupakan tumbuhan berbunga yang ditemukan hampir di semua pantai landai dan dangkal di dunia. Dari sekitar 50 spesies lamu yang ada di dunia, 12 spesies diantaranya ditemukan di Indonesia dan diduga Indonesia mempunyai sebaran padang lamun terluas di daerah tropika. Salah satu peranan padang lamun di perairan adalah sebagai tempat hidup (habitat) bagi berbagai jenis biota. Kelebatan daun lamun mendukung sejumlah besar organisme epifit (perifiton) dengan substrat yang cocok untuk penempalan. Komunitas perifiton yang hidup pada padang lamun memberikan kontribus terhadap peningkatan produktivitas primer ekosistem padang lamun secara keseluruhan.
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Judul: Enhancement of photon absorbtion on BaxSr1-xTiO3 thin films semiconductor using photonic crystals.
Abstrak: In this research, has been conducted BaxSr1-xTiO3 (BST) thin films manufacturing for mole fraction x = 0.25, 0.35, 0.45, and 0.55; and concentration of 1 molar using chemical solution depositon (CSD) method. The materials, which are used in this research, are barium acetate [Ba(CH3COO)2, 99%], strontium acetate [Sr(CH3COO)2, 99%], titanium isopropoxide [Ti(C12O4H28), 97.999%], gallium trioxide [Ga2O3], 2-methoxyethanol [H3COOCH2CH2OH, 99%] and 1 x 1 cm of transparent conductive oxide (TCO) glass as substrate. Two BST thin films are made that for BST thin films which are doped by 10% galium (BGST) as p-type layer and pure BST solution as n-type. BST solution is made by reacting barium acetate [Ba(CH3COO)2, 99%], strontium acetate [Sr(CH3COO)2, 99%] and titanium isopropoxide [Ti(C12O4H28)] into 2-methoxyethanol solvent [H3COOCH2CH2OH, 99%] in accordance with mass gram for each x value. While, BGST solution is made in the same way as BST solution, plus adding gallium at 10% of the mass of BST. Once all materials are reacted, then vibrated using ultrasonic for 90 minutes, and followed by coating BGST / BST on the TCO substrate. Once the layer is formed, then annealed for 15 hours at temperature of 500 °C with increasing rate of 1.67 oC/minute. Characterizations of BST thin films with or without photonic crystals include the absorbance and transmittance in the visible light spectrum, as well as the electrical photoconductivity characterizations. From BST thin films without photonic crystals indicate that our thin films have light absorption area on almost the entire range of the visible light spectrum even to the infrared range with absorption value over than 67.6%, in addition, it can be seen that the maximum absorbance of BST thin films for all mole fractions lie in blue to green light spectrum region, 457 nm ≤ λ ≤ 570 nm and the minimum in yellow to red light spectrum region, 570 nm ≤ λ ≤ 678 nm. The largest absorbance is found at x = 0.25 with average absorbance value of 92.04% and maximum and minimum absorbance peaks at wavelength of 500.89 and 657.72 nm, respectively. At x = 0.35, average absorbance value decreased to 83.55% with maximum and minimum peaks at 505.73 and 613.68 nm, respectively. Then increased to 91.16% at x = 0.45 with maximum and minimum peaks at 506.04 and 618.56 nm, respectively. At x = 0.55, average absorbance value decreased to 80.12% with maximum and minimum peaks at 507.85 and 608.79 nm, respectively. Moreover, it can be seen that the addition of barium mole fraction leads to wider maximum absorbance or minimum transmittance peaks and narrower minimum absorbance or maximum transmittance peaks in the same range of the green and blue & red light spectrums, respectively. BST thin films with photonic crystals show increasing in absorption for all x values in the range of 3.04 into 13.33%. At x = 0.25, average absorbance percentage increased 3.96% from 92.4 into 95.68%, for x = 0.35 average percentage increased 7.07% into 89.45 from 83.55%. Furthermore, average absorbance of BST thin films at x = 0.45 increased 3.04% from 91.16 into 93.93% and x = 0.55 has
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