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: Studi Perbandingan komunitas makrozoobentos dengan pendekatan ekologis di perairan pesisir Jawa
Abstrak: Saat ini perubahan pada ekosistem pesisir semakin berkembang luas, baik berupa konversi lahan atau pencemaran. Studi mengenai bentos, sebagai salah satu indikator kondisi perairan, telah cukup banyak dilakukan tapi umumnya pada lokasi atau kepentingan tertentu. Studi perbandingan ini mencoba memadukan komunitas makrozoobentos di beberapa lokasi perairan pesisir Jawa sebagai usaha pengelolaan yang lebih luas dan terpadu. Selanjutnya diharapkan akan tampak kecenderungan atau signifikasi ekologis dari area perairan ini. Studi didasarkan pada data sekunder bersifat primer dari penelitian Kastoro dan kawan-kawan (peneliti dari LP30 LIPI) tahun 1989 dan 1991. Enam lokasi perairan pesisir Jawa yang menjadi lokasi studi yaitu laguna Grajagan, estuari Porong, estuari Wonokromo, estuari Bengawan Solo keempatnya di Jawa Timur; dekat pantai dan lepas pantai Kepulauan Seribu keduanya di DKI Jakarta. Analisa komponen utama digunakan dalam menggambarkan parameter fisik yang lebih berpengaruh pada perairan. Komposisi dan dominasi komunitas dilihat dari jumlah jenis dan kepadatan. Sedangkan penggambaran korespondensi makrozoobentos dengan perairan menggunakan Analisa korespondensi. Selanjutnya kondisi dan karakteristik komunitas digambarkan dengan model grafik suksesi, indeks keragaman, dan keseragaman. ...
Keyword: 

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
Keyword: