Judul: Biologi reproduksi ikan keperas (Cyclochelicthys apogon) di sungai Musi, Sumatera Selatan
Abstrak: Ikan keperas (Cyclocheilicl~thys apogm~) merupakan salah satu sumberdaya perikanan air tawar yang terdapat di Sungai Musi, Sumatera Selatan. Pola pemanfaatan yang bersifat eksploratif dilchawatirkan akan mempengaruhi populasi ikan tersebut. Untuk itu diupayakan suatu teldlnik pengelofaan yang tepat dengan memperhatikan aspek penangkapan, habitat, dan budidaya. Untuk mendukung kesiatan pengelolaan ikan keperas di Sungai Musi, Sumatera SeIatan diperlukan inforrnasi diantaranya aspek-aspek biologi dan ekologinya. Salah satu aspek biologi yang perlu dikaji adalah biologi reproduksi ikan keperas.
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Judul: Biologi Reproduksi Ikan Juaro (Pangasius polyuranodon) di Perairan Sungai Musi, Sumatera Selatan
Abstrak: Ikan Juaro (Pangasius polyuranodon) merupakan salah satu potensi sumberdaya perikanan di Sungai Musi yang perlu diperhatikan, ikan ini dikhawatirkan akan mengalami penurunan jumlah stok akibat pencemaran perairan dan pendangkalan. Pengelolaan sumberdaya perikanan perlu segera dilakukan untuk mengatasi hal ini. Penelitian mengenai aspek biologi reproduksi diharapkan dapat menjadi informasi dasar bagi pengelolaan tersebut baik untuk kegiatan budidaya, penangkapan, maupun usaha pelestarian bagi ikan Juaro (P. polyuranodon) di Sungai Musi. Pengambilan ikan contoh dilakukan pada bulan Juni 2006, Agustus 2006, Januari 2007 dan Juli 2007 di Sungai Musi dengan menggunakan alat tangkap Gillnet (jaring insang). Analisis ikan contoh dilakukan di Laboratorium Biomakro dan Laboratorium Biomikro bagian Laboratorium Ekobiologi Perairan, Departemen Manajemen Sumberdaya Perairan, Fakultas Perikanan dan Ilmu Kelautan, Institut Pertanian Bogor. Analisis data meliputi hubungan panjang berat, rasio kelamin, faktor kondisi, tingkat kematangan gonad, indeks kematangan gonad, fekunditas, dan pola pemijahan. Jumlah ikan Juaro (P. polyuranodon) yang diamati selama penelitian adalah sebanyak 51 ekor yang terdiri dari 23 ekor ikan jantan dan 28 ekor ikan betina dengan panjang total berkisar antara 85-511 mm. Hubungan panjang berat ikan Juaro (P. polyuranodon) jantan dan betina adalah W= 0.00002L2.8062 dan W= 0.00002L2.8215. Setelah analisis uji-t maka pola pertumbuhannya adalah allometrik negatif untuk ikan jantan dan ikan betina. Rasio kelamin secara keseluruhan selama penelitian seimbang (1:1). Rata-rata faktor kondisi cenderung meningkat seiring dengan peningkatan tingkat kematangan gonad. Ikan Juaro (P. polyuranodon) telah memasuki waktu memijah dan bulan Juni-Agustus diduga sebagai waktu memijah ikan tersebut. Indeks kematangan gonad ikan betina lebih besar dibandingkan dengan ikan jantan. Fekunditas ikan Juaro setelah dilakukan pengamatan berkisar antara 616-7.059 butir telur, dan pola pemijahannya total spawner.
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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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