Judul: Analisa struktur komunitas ikan di Segara Anakan Cilacap
Abstrak: Tujuan penelitian ini adalah untuk mendapatkan informasi yang nyata mengenai struktur komunitas ikan di perairan laguna Segara Anakan dalam rangka pengelolaan sumberdaya perikanan pada perairan tersebut. Penelitian ini dilakukan pada musim kemarau (Agustus sampai dengan September 1983). Penangkapan ikan dengan gill neta dan trap nets dalam unit usaha yang sama besar. Analisa masalah didekati dengan menggunakan indek keanekaragaman jenis dan model distribusi kelimpahan. Hasil penelitian menunjukkan terdapat 45 jenis ikan yang termasuk ke dalam 36 famili. Banyaknya jenis tiap wilayah tidak sama. Mugil dussumieri. Mugil buchanani mempunyai kelimpahan relatif paling tinggi. Walaupun terdapat dugaan bahwa keanekaragaman jenis di laguna Segara Anakan sedang menuju degradasi yang dimulai dari wilayah B, tetapi secara keseluruhan keaneka ragaman dan kemerataan individu per jenisnya masih termasuk tinggi. Perairan laguna Segara Anakan, termasuk tiap wilayahnya, masih berperan dengan baik bagi komunitas ikannya. Hal ini ditunjukkan oleh model distribusi kelimpahan jenisnya yang mengikuti model Preston.
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Judul: Studi Deografi Ikan Belanak (Mugil dussumieri C. V.) dan Ikan Kada (Mugil buchanani Blkr.) di Perairan Segara Anakan, Cilacap, Jawa Tengah
Abstrak: Famili Mugilidae banyak terdapat di pantai pantai Gaerah tropik dan sub-tropik, sebagai contoh sembilan species terdapat di Indonesia. Dua di antara sembilan species tersebut terdapat di Segara Anakan, yaitu Mugil dussumieri C.V. dan Mugil buchanani Blkr. Pendangkalan secara terus menerus di Segara Anakan akan mengakibatkan kerkurangnya areal laguna menjadi daratan di masa mendatang. Seandainya hal ini terjadi maka semua organisme yang hidup, baik yang menetap atau sementara akan terganggu daur hidup dan kehilangan habitatnya. Penelitian ini bertujuan untuk mendapatkan gambaran mengenai parameter-parameter yang dapat membantu dalam pengelolaan perikanan (misalnya struktur kelompok umur; pola pertumbuhan; mortalitas) di laguna Segara Anakan, Cilacap, Jawa Tengah. Metode Bhattacharya (1967) digunakan untuk menentukan jumlah, proporsi, serta nilai tengah kelompok umur. Persamaan pertumbuhan didapatkan berdasarkan prinsip suksesi kohort. Persamaan pertumbuhan von Bertalanfly digunakan untuk menggambarkan persamaan pertumbuhan panjang dan berat ikan belanak. ...
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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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