Judul: Analisis komunitas artropoda predator penghuni lansekap persawahan di daerah Cianjur, Jawa Barat
Abstrak: Penelitian dilaksanakan di Kecamatan Ciranjang dan Bojongpicung, Kabupaten Cianjur, Jawa Barat. Pengambilan contoh artropoda berlangsung mulai bulan Juli 1997 hingga Oktober 1998. Penelitian bertujuan untuk. mengkaji struktur komunitas artropoda predator pada berbagai komponen lansekap persawahan dan mengkaji kemiripan komunitas predator pada masing-masing komponen lansekap tersebut. Predator pada tajuk diamati dengan D-vac, sedangkan predator yang aktif di permukaan tanah diamati dengan lubang jebakan. Perangkap berperekat digunakan untuk memantau pemencaran predator melalui udara. Artropoda yang tertangkap kemudian diidentifikasi di laboratorium. Keanekaragaman spesies predator dianalisis dengan Indeks Shannon, Pielou dan Berger-Parker dan kemiripan komunitas predator antar habitat didekati dengan Analisis Korespondensi. Secara kuantitatif, kemiripan juga dihitung dengan Koefisien Kemiripan Sorensen. Untuk mengetahui perbedaan kerapatan populasi...dst
Keyword: keanekaragaman hyati; interaksi biologi; pola migrasi

Judul: Keragaman Predator dan Keberadaan Sycanus annulicornis pada Tanaman Peria dan Ubi Jalar di Daerah Kabupaten Bogor Jawa Barat
Abstrak: Salah satu cara mengendalikan organisme pengganggu tanaman (OPT) dapat dilakukan secara hayati dengan penambahan predator sebagai musuh alami sehingga dapat meminimalkan penggunaan insektisida pada suatu lahan. Penelitan ini bertujuan untuk mengeksplorasi keragaman predator secara umum serta mengamati keberadaan Sycanus annulicornis pada peria dan ubi jalar. Pengamatan dilakukan dengan menggunakan pitfall trap dan jaring serangga. Pitfall trap ditempatkan di lapangan sebanyak 10 perangkap dengan jarak 3 m , sementara jaring serangga dilakukan dengan cara sistematis sebanyak 15 ayunan untuk tiap lokasi pengambilan contoh. Pengamatan dilakukan 12 kali dengan interval pengamatan satu minggu sekali sejak Mei hingga Juli 2018. Pada tanaman peria dan ubi jalar di Kecamatan Ciampea (Desa Cibanteng, Cihideung Badak, Cihideung Ilir) dan Kecamatan Ranca Bungur (Desa Bantar Sari, Pasir Gaok, Ranca Bungur) Kabupaten Bogor ditemukan sebanyak 1420 individu serangga yang terdiri dari 27 spesies, 14 famili, dan 9 ordo yang berbeda, secara khusus ditemukan S. annulicornis sebanyak 56 individu. Hasil analisis menunjukan nilai indeks keanekaragaman Shannon-Wienner predator memiliki nilai keanekaragaman sedang, nilai indeks Simpson dengan tingkat kompleksitas keragaman tinggi, dan indek Everness menunjukkan nilai kemerataan yang tinggi dengan komunitas yang stabil. Indeks kemiripan tinggi terdapat pada tanaman peria dengan jarak 0-250 m dan 500-700 m dari permukiman warga, sedangkan kemiripan spesies rendah pada tanaman peria dengan jarak 250-500 m dan ubi jalar pada jarak 500-700 m dari permukiman warga. Hasil ACE menunjukkan kurva yang landai, menunjukkan bahwa serangga yang diamati sudah merepresentasikan serangga yang ada di pertanaman peria dan ubi jalar tersebut.
Keyword: kemiripan spesies, musuh alami, pitfall trap, S. annulicornis

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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