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: Aspek biologi repoduksi beberapa jenis ikan di waduk lohar, jawa timur
Abstrak: Penelitian aspek biologi reproduksi beberapa je- nis ikan dilakukan sejak pertengahan bulan Desember 1978 sampai dengan akhir bulan Februari 1979. Ikan contoh ditangkap dengan "experimental gill net" berukuran mata jaring 3,5; 5; 7,5 dan 8,5 cm. Alat tangkap lain yang digunakan adalah gill net produksi, ala lempar dan pancing. Jenis iman yang diteliti adalah ikan mujair, Tilapia mossambica Peters; hampal, Hampala macrolepidota (C.V.); nilem, Osteochilus hascelti (C.V.); keprek, Puntius sp; tawes merah, Puntius bramoides (C.V.) dan wader, Puntius binotatus (C.V.). Jumlah ikan contoh yang tertangkap masing-masing adalah ikan ujair (175); hampal (119); nilem (46); keprek (292); tawes merah (119) dan wader (89). Ukuran ikan betina dan jantan terkecil yang sudah bergonada matang untuk setiap ikan masing-masing adalah: ikan mujair 125 dan 112 mm; hampal 197 dan 223 mm; nilem 139 dan 124 mm; keprek 92 dan 94 mm; tawes merah 166 dan 121 mm dan wader 63 dan 61 mm. Koefisien regresi (b) dari hubungan lo berat dengan log panjang total semua ikan telah diteliti untuk menentukan apalah pertumbuhan i an-ikan tersebut isometrik atau allometrik. Frekuensi dan waktu pemi jahan diduga dari bentuk grafik frekuensi diameter telur pada setiap tingkat kematangan gonada (TKG) dan dari persentase mingguan setiap NG ikan contoh serta dari komposisi TKG nonurut klassifikasi Cassie (1956). Diduga ikan mujair memijah lebih dari satu kali dalam setahun. Ikan hampal dan nilem diduga memijah pada satu musim pemijahan dalam satu tahun, tetapi selama satu musim dapat berlangsung beberapa kali pemi jahan oleh individu yang sama. Musim penijahan ikan keprek dan tawes merah diduga berlangsung dua kali dalam setahun. Sedang ikan wador diduga memijah hanya satu kali setahun. ...
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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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