Judul: Penyebaran dan Penyebaran Postlarva dan Juvenil Udang di Saluran-Saluran Delta Upang di Sumatera Selatan
Abstrak: Dalam rangka pembangunan pertanian, pemerintah telah menggali saluran-saluran di daerah Delta Upang, Sumatera Selatan yang dimaksudkan untuk memperbaiki sistim pengairan persawahan pasang surut di daerah itu. Selain maksud tersebut, saluran-saluran itu diharapkan juga memegang peranan dalam bidang perikanan sebagai suatu lingkungan hidup beberapa jenis udang dan ikan.
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Judul: Kondisi kualitas air di saluran-saluran di daerah persawahan, persawahan-pemukiman dan pemukiman, delta Upang, Sumatra Selatan
Abstrak: Suatu penelitian telah dilakukan dari bulan Nopember 1977 sampai dengan bulan Januari 1978 untuk menilai kualitas air di saluran-saluran Delta Upang, yang menerima limpahan air dari daerah persawahan dan pemukiman. Penilaian kualitas air ditujukan untuk mengetahui pengaruh limpahan air dari daerah-daerah persawahan, persawahan pemukiman dan pemukiman, yang digambarkan melalui sifat-sifat fisika, kimia dan biologi perairannya. Sifat biologi yang diukur adalah keragaman dan keseragaman jenis hewan bentos makro. Hasil yang diperoleh menunjukkan bahwa kualitas fisika-kimia air di stasiun-stasiun pengamatan relatif lebih dipengaruhi oleh kualitas air bawaan dari S. Musi dan S. Upang; dan kualitas airnya baik dari kualitas fisika-kimia air tersebut maupun dari biologinya termasuk sedang. Dari parameter-parameter yang diukur, yang paling berpengaruh terhadap keterdapatan (keragaman) jenis-jenis hewan bentos makro adalah salinitas, daya hantar listrik, kekeruhan dan kedalaman. Salinitas, daya hantar listrik dan kekeruhan mempunyai korelasi positif, dan kedalaman berkorelasi negatif dengan nilai keragaman jenis hewan bentos makro. Keseragaman jenis di antar mintakat didapatkan berbeda. Perbedaan dan keseragaman jenis hewan bentos disebabkan oleh faktor kekeringan. Hewan-hewan bentos yang didapatkan di mintakat atas lebih seragam dibandingkan dengan yang ada di mintakat bawah. Dari jenis-jenis hewan bentos makro yang dikumpulkan diketahui jenis-jenis petunjuk perairan, yang menerima limpahan dari per- sawahan dan pemukiman. Jenis-jenis tersebut adalah Melanoides tuberculata (siput), siput lain (tidak teridentifikasi), Stenothyra glabrata (siput) dan Lirceus (udang-udangan), sebagai jenis jenis petunjuk limbah persawahan; dan Paludinella (siput), Dero dan Corynoneura dari pengaruh pemukiman.
Keyword: Kualitas air, Salinitas, Kualitas lingkungan, Hewan bentos

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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