Judul: Ordinasi komunitas ikan demersal di pantai utara Jawa dengan analisis korespodensi
Abstrak: Penelitian ini bertujuan mengkaji pengaruh dan dampak perubahan pola penangkapan terhadap struktur komunitas demersal berdasarkan data komposisi hasil tangkapan trawl.
Keyword: komunitas, ikan demersal, analisis korespodensi

Judul: Struktur komunitas hasil tangkapan pancing dan preferensi habitat stock ikan mujair ( Oreochromis mossambicus, Trew ) di waduk Selorejo, Malang, Jawa - Timur
Abstrak: Penelitian ini dilaksanakan dari tanggal 22 Juni sampai tanggal 1 Agustus 1987, dengan metoda Creel census. Adapun tujuan dari penelitian ini adalah untuk melihat perkembangan dari struktur komunitas ikan dan preferensi habitat stock ikan mujair (O. mossambicus, Trew) di Waduk Selorejo pada periode postinundasi. Waduk merupakan hasil pembendungan ekosistem sungai (mengalir) menjadi sistim stagnant. Akibat adanya perubahan ekosistem, (Hawkes, 1977), akan mempengaruhi respon organisme perairan terhadap lingkungannya, baik jumlah species dan perubahan species dalam populasi maupun proporsi dari komposisi species di dalam komunitas. Keberadaan waduk dalam suatu ekosistem perairan adalah tidak kontinyu (Lowe- Mac Connel dalam Bhukaswan, 1980). Hal ini penting untuk keberadaan waduk tersebut dalam mencapai potensi "life time'nya dan dalam pengelolaan. Komposisi jenis "ikan" yang tertangkap didominasi oleh ikan mujair (0. mossambicus) selanjutnya diikuti oleh ikan wader cakul (Rasbora sp), wader pari (R. argyrotaenia), mas (Cyprinus carpio), wader gathul (Panchax panchax), udang (Macrobrachium sentangence), tawes (Puntius javanicus) dan sengkaring (Labeobarbus tambra) dengan prosentase masing- masing sebesar 93,5; 3,2; 1,5; 1,3; 0,22; 0,01; 0,02. Berdasarkan nilai konstanta m Motomura menunjukkan bahwa kea- daan komunitas di perairan Selorejo dalam tingkat diversitas dan struktur organisasi yang rendah. Hasil uji kesesuaian model di dapatkan bahwa model Preston merupakan model yang berlaku dalam arti bahwa faktor yang berperan dalam lingkungan perairan tidak dipengaruhi oleh satu faktor, melain- kan oleh beberapa faktor baik biotik maupun abiotik…dst
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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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