Judul: Dinamika Status Stok Ikan Kuniran (Upeneus sulphureus Cuvier, 1829) di Perairan Selat Sunda
Abstrak: Ikan kuniran merupakan ikan demersal yang bernilai ekonomis penting. Tingginya peningkatan konsumsi masyarakat mengakibatkan peningkatan penangkapan. Tujuan penelitian ini adalah untuk menganalisis status stok ikan kuniran (Upeneus sulphureus) berdasarkan data hasil tangkapan nelayan yang didaratkan di PPP Labuan, Banten. Penelitian dilakukan pada bulan Mei-September 2016. Analisis data terdiri atas rasio kelamin, hubungan panjang bobot, sebaran frekuensi panjang, parameter pertumbuhan, ukuran pertama kali matang gonad, ukuran pertama kali tertangkap, laju eksploitasi, daerah penangkapan, dan model produksi surplus. Hasil penelitian menunjukkan ikan kuniran memiliki pola pertumbuhan allometrik negatif. Koefisien pertumbuhan (K) ikan kuniran betina lebih tinggi dibandingkan dengan ikan kuniran jantan. Nilai Lc<Lm, menunjukkan ikan kuniran belum matang gonad sudah tertangkap. Berdasarkan model Fox upaya aktual tahun 2014 melebihi upaya optimum (fmsy). Laju eksploitasi ikan kuniran melebihi laju eksploitasi optimum, sehingga diduga ikan kuniran di perairan Selat Sunda telah mengalami tangkap lebih dan eksploitasi berlebih.
Keyword: Ikan kuniran (Upeneus sulphureus), laju eksploitasi, pertumbuhan, upaya optimum, Selat Sunda

Judul: Kajian Stok Ikan Kuniran (Upeneus sulphureus, Cuvier 1829) di Perairan Selat Sunda, Banten
Abstrak: Ikan kuniran (Upeneus sulphureus) merupakan ikan demersal sebagai komoditas tangkapan utama di Selat Sunda yang masih banyak dimanfaatkan. Penelitian ini bertujuan untuk menganalisis stok ikan kuniran sebagai dasar pengelolaan agar pemanfaatannya dapat dilakukan secara optimal dan berkelanjutan. Pengambilan contoh dilakukan secara acak berlapis berdasarkan panjang ikan pada bulan Mei-Oktober 2018 di PPP Labuan, Banten. Hasil penelitian menunjukkan nisbah kelamin ikan kuniran adalah 1,00:1,09. Pola pertumbuhan ikan kuniran adalah allometrik negatif dan isometrik untuk masingmasing jantan dan betina. Distribusi frekuensi panjang berkisar antara 71-162 mm. Nilai dugaan L∞ ikan jantan 200,0 mm dengan nilai K sebesar 0,26, sedangkan ikan betina memiliki nilai dugaan L∞ sebesar 172,5 mm dengan nilai K sebesar 0,31. Pola rekrutmen ikan kuniran memiliki dua puncak. Laju mortalitas total ikan jantan 1,95 dan betina 1,40. Laju eksploitasi ikan jantan sebesar 0,81, sedangkan ikan betina sebesar 0,70. Ukuran pertama kali tertangkap kuniran lebih kecil dibandingkan ukuran pertama kali matang gonad. Pemanfaatan ikan kuniran di Selat Sunda mengalami growth overfishing.
Keyword: Kajian stok, PPP Labuan, Selat Sunda, Upeneus sulphureus

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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