Judul: Karakteristik Biologi dan Teknologi Daerah Penangkapan Ikan Karang di Perairan Karimunjawa
Abstrak: Nelayan belum memiliki kriteria dalam penentuan alat tangkap dan daerah penangkapan ikan sehingga banyak ikan yang tertangkap dengan ukuran yang tidak layak tangkap. Tujuan penelitian ini yaitu menentukan karakteristik dan mengategorikan daerah penangkapan ikan karang berdasarkan aspek biologi dan teknologi. Data yang dikumpulkan yaitu produksi dan trip unit penangkapan bubu, panah, dan pancing selama penelitian dan tahun 2013-2017, panjang cagak ikan, pengoperasian alat penangkapan ikan, risiko bahaya penggunaan alat tangkap terhadap nelayan, dan risiko penggunaan alat tangkap terhadap tingkat keracunan ikan. Metode penelitian yang digunakan yaitu metode survei, dengan teknik penentuan sampel menggunakan metode accidental sampling. Hasil penelitian menunjukan bahwa nelayan Karimunjawa mengoperasikan alat tangkap bubu, panah, dan pancing. Spesies ikan karang hasil tangkapan bubu, panah dan pancing secara berturut-turut yaitu sebanyak 15, 53, dan 14 spesies. Alat tangkap pancing memiliki indeks keragaman (H') tertinggi. Panah memiliki nilai produktivitas paling tinggi dan memiliki risiko bahaya paling tinggi terhadap nelayan, sedangkan pancing merupakan alat tangkap yang paling mudah dioperasikan. Alat tangkap bubu, panah, dan pancing tidak mempunyai risiko meracuni hasil tangkapannya. Daerah penangkapan ikan menggunakan bubu terdapat 1 daerah penangkapan tidak potensial, sedangkan terdapat 11 daerah penangkapan tidak potensial menggunakan panah, dan 3 daerah penangkapan tidak potensial menggunakan pancing.
Keyword: daerah penangkapan ikan, ikan karang, karakteristik biologi, karakteristik teknologi, Karimunjawa

Judul: Karakteristik Hasil Tangkapan dan Keberlanjutan Perikanan Bubu di Perairan Karimunjawa, Jepara, Jawa Tengah
Abstrak: Keberlanjutan perikanan bubu di Perairan Karimunjawa dapat ditentukan dengan memperhatikan aspek teknologi. Aspek teknologi dipilih karena dapat meningkatkan nilai pada dimensi lainnya. Penelitian ini bertujuan untuk mengetahui karakteristik hasil tangkapan serta keberlanjutan perikanan bubu di Karimunjawa. Metode yang digunakan pada penelitian ini adalah metode survei dengan sampel yang ditentukan dengan metode purposive sampling. Nilai produksi per upaya penangkapan (CPUE) yang didapat berkisar antara 7,6 – 10,9 kg/bubu. Hasil tangkapan bubu didominasi ikan karang diantaranya kakap merah (Lutjanus lemniscatus) 127 ekor (57,99%) dengan kisaran panjang 27-50 cm, kerapu (Cephalopolis sonnerati) 50 ekor (22,83%) dengan kisaran panjang 28-48 cm dan dodoh (Ctenochaetus striatus) 42 ekor (19,18%) dengan kisaran panjang 25-45 cm. Penilaian keberlanjutan perikanan terdiri dari beberapa atribut yaitu kualitas ikan, pengoperasian alat tangkap, jumlah bubu yang digunakan, penggunaan BBM, selektivitas alat tangkap menurut komposisi hasil tangkapan, selektivitas alat tangkap menurut ukuran ikan hasil tangkapan dan ukuran lingkar badan serta alat tangkap yang rusak. Perairan Karimunjawa memiliki indeks keberlanjutan perikanan 90,62 dengan status berkelanjutan.
Keyword: bubu, karakteristik hasil tangkapan, Karimunjawa, keberlanjutan

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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