Judul: Aspek biologi reproduksi ikan lidah pasir (Cynoglossus lingua Hamilton-Buchanan, 1822) di perairan Ujung Pangkah, kabupaten Gresik, Jawa Timur
Abstrak: Ikan lidah pasir (Cynoglossus lingua) merupakan salah satu sumberdaya perikanan di Perairan Pangkah, Gresik, JAwa Timur. Penelitian ini mengkaji beberapa aspek reproduksi ikan lidah sebagai dasar dalam manajemen sumberdaya dan menjadi acuan dalam penelitian yang akan datang.
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Judul: Studi reproduksi ikan lidah (Cynoglossus lingua Hamilton-Buchanan) di Perairan Ujung Pangkah, Kabupaten Gresik, Jawa Timur
Abstrak: Cynoglossus lingua merupakan salah satu sumberdaya perikanan laut yang terdapat di Perairan Ujung Pangkah, Kabupaten Gresik, Jawa Timur. Ikan ini termasuk ikan yang cukup memiliki nilai ekonomis di wilayah tersebut, namun hingga saat ini belum pernah diteliti sehingga informasi mengenai aspek reproduksi ikan ini belum ada di Ujung Pangkah. Dalam penelitian ini, dikaji studi reproduksi C. lingua yang diharapkan dapat memberi informasi untuk pengelolaan sumberdaya dan menjadi dasar dalam penelitian yang akan datang. Penelitian ini dilakukan selama enam bulan dari bulan Agustus 2005 - Januari 2006. Ikan lidah yang berhasil diperoleh selama penelitian berjumlah 202 ekor, yakni 94 jantan dan 108 betina. Nisbah kelamin ikan jantan dan betina 1:1,4. Panjang total ikan berkisar antara 65-325 mm. Pola pertumbuhan ikan lidah adalah allometrik negatif baik jantan maupun betina. Kisaran nilai faktor kondisi ikan lidah jantan lebih besar (0,9803-1,1918) daripada ikan betina (0,7862-0,9328). Ikan lidah jantan dan betina pertama kali matang gonad pada selang ukuran panjang 94-122 mm. Diduga musim pemijahan ikan lidah pada bulan Agustus sampai Januari dan puncak pemijahannya pada bulan Desember. Ikan jantan memiliki kisaran nilai IKG yang lebih kecil (0,4066% - 0,6498%) daripada ikan betina (1,9901% 5,2253%). Fekunditas ikan lidah berkisar antara 360-35926 butir. Rata-rata fekunditas per ekor ikan lidah sebesar 14477 butir. Diameter telurnya berkisar antara 0,08-0,63 mm. Sebaran diameter telur ikan lidah menunjukan beberapa puncak pada TKG IV, dapat diduga bahwa pola pemijahan ikan lidah adalah partial spawner, yakni telur yang dikeluarkan pertama kali adalah telur yang berada pada puncak pertama dilanjutkan dengan pengeluaran telur pada puncak berikutnya.
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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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