Judul: Komunitas Herpetofauna pada Ekosistem Sawah di Kabupaten Magelang, Jawa Tengah
Abstrak: Ekosistem sawah sebagai ekosistem lahan basah buatan manusia menyediakan habitat yang sesuai bagi satwaliar liar khususnya amfibi dan reptil (herpetofauna). Keberadaan komunitas herpetofauna di sawah terancam akibat penggunaan bahan kimia secara intensif yang menyebabkan perubahan komposisi jenis dan menyebabkan kecacatan. Tujuan penelitian ini yakni membandingkan keanekaragaman dan kecacatan tubuh herpetofauna di sawah organik dan non organik. Penelitian dilakukan pada bulan Mei hingga Juni 2016 di sawah organik Sawangan serta sawah non organik di Salam dengan metode perjumpaan langsung (Visual Encounter Survey) dan metode pasif jebakan lem (glue trap). Total jenis yang ditemukan yakni 21 jenis herpetofauna dari 9 famili (17 jenis di sawah organik dan 16 di sawah non organik). Nilai kelimpahan tertinggi pada habitat sawah organik (11.28 individu/jam-pengamat). Fejervarya limnocharis dan Eutropis multifasciata merupakan jenis herpetofauna dominan pada kedua lokasi. Indeks keanekaragaman tertinggi terdapat pada sawah organik (H’ = 1.27). Tingkat kecacatan herpetofauna tertinggi dijumpai di sawah non organik.
Keyword: ekosistem, herpetofauna, komunitas, sawah

Judul: Struktur dan komposisi komunitas herpetofauna pada lanskap termodifikasi manusia di Kabupaten Gianyar Bali
Abstrak: Lanskap termodifikasi manusia menjadi satu-satunya habitat untuk satwa liar khususnya amfibi dan reptil yang berada di Kabupaten Gianyar, Bali (Indonesia). Keberadaan herpetofauna memiliki peran yang penting dalam keseimbangan ekosistem di Kabupaten Gianyar, akan tetapi hingga kini belum terdapat data tentang keberadaan jenis ini. Oleh karena itu penelitian ini diharapkan mampu (1) mengidentifikasi komunitas herpetofauna (amfibi dan reptil) pada gradien habitat lanskap termodifikasi manusia, (2) menentukan hubungan komunitas herpetofauna dengan karakter lingkungan, dan (3) menentukan kecenderungan jenis generalis pada gradien habitat lanskap termodifikasi manusia. Penelitian ini dilaksanakan pada bulan Juli-Oktober 2014 menggunakan metode VES (Visual Encountered Surveys) dengan penyetaraan waktu (time constrained searches). Terdapat 40 titik yang diamati pada 4 tipe habitat (permukiman, persawahan, tegalan, dan tegakan monokultur). Informasi yang dipaparkan dalam penelitian ini meliputi struktur dan komposisi herpetofauna (amfibi dan reptil) yang dianalisis secara deskriptif, nilai keanekaragaman jenis menurut indeks Shanon-Wiener, nilai kesamaan komunitas pada tipe habitat lanskap termodifikasi manusia menggunakan perhitungan euclidean distance, hubungan antara komunitas herpetofauna dan karakter lingkungan (biotik, abiotik, dan gangguan), serta ukuran tubuh jenis generalis yang dianalisis menggunakan analisis korelasi sederhana Spearman Rank. Jumlah individu herpetofauna yang ditemukan selama penelitian 1353 individu (751 amfibi and 602 reptil) yang terdiri dari 11 jenis amfibi dan 23 jenis reptil. Karakter komunitas (kelimpahan, kekayaan, dan keanekaragaman jenis) cenderung mengalami penurunan pada gradien habitat (rendah-tinggi). Berdasarkan kesamaan habitat terdapat tiga komunitas amfibi and reptile. dst ...
Keyword: amphibian, generalist, Gianyar, herpetofauna, human modified landscape, reptile

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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