Judul: Aspek Biologi Reproduksi Beberapa Jenis Ikan di Waduk Lahor, Jawa Timur
Abstrak: Penelitian aspek biologi reproduksi beberapa jenis ikan dilakukan sejak pertengahan bulan Desember 19778 sampai dengan akhir bulan Februari 1979. Ikan contoh ditangkap dengan "eksperimental gillnet" berukuran mata jaring 3,51; 5; 7,5 dan 8,5 cm. Alat tangkap lain yang digunakan adalah : gill net reproduksi, jala lempar dan pancing.
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Judul: Inventarisasi dan Kelimpahan Ikan-Ikan di Waduk Lahor, Tawa Timur
Abstrak: Inventarisasi dan penenlitian kelimpahan ikan-ikan dilakukan dari akhir bulan Desember 1978 sampai dengan akhir bulan Februari 1979 di Waduk Lahor, Jawa Timur. Pengambilan contoh ikan di enam wilayah penangkapan yaitu Wilayah A, B, C, D, E dan F dilakukan dengan menggunakan jaring insang produksi, jaring insang percobaan dan jala. Jaring insang produksi dan percobaan berukuran mata jaring 3 cm, 5 cm, 6 cm, 7 cm, 10 cm dan 11 cm, sedangkan jala berukuran mata jaring 3,1 cm dan 4,6 cm. Ikan yang tertangkap di waduk ini adalah keprek, tawes, tawes merah, wader, nilem, palung, sengkaring, mujair, nila, gabus, lele, julung-julung, kepala timah dan ikan seribu. Ikan keprek, tawes, tawes merah, wader, palung, nilem dan mujair tersebar di seluruh wilayah perairan Waduk Lahor (Wilayah A, B, C, D, E dan F). Ikan lele didapatkan di Wilayah B, D, dan E. Ikan gabus didapatkan di Wilayah A, D, E dan F. Ikan sengkaring hanya didapatkan di Wilayah C dan ikan nila hanya di Wilayah D. Ikan-ikan lainnya yaitu julung-julung, kepala timah dan ikan seribu tidak ditentukan penyebaran dan kelimpahan relatifnya. ...
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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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