Judul: Analisis keragaan morfologi dan kualitas buah populasi nenas (Ananas comosus (L.) Merr.) queen di empat desa kabupaten Bogor
Abstrak: Pineapple (Ananas comosus (L.) Merr.) belongs to the Bromeliaceae, and it differentiated into five phenotypic groups, they are Cayenne, Queen, Spanish, Abacaxi and Maipure. Bogor Regency as one of pineapple producers in Indonesia, mainly produces Queen pineapple. The objective of the research is to study morphological performance and fruit quality of pineapple from Bogor Queen Pineapple population in four villages (Cipelang, Sukaharja, Tajur Halang and Sukaluyu). Sampling method was done based on Purposive Random Sampling Method from observed population which fulfil conditions.
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Judul: Keragaan morfologi dan kualitas buah pepaya dari empat populasi pepaya di Wilayah Bogor
Abstrak: Penelitian ini dilakukan dalam rangka mempelajari keragaan morfologi dan kualitas buah pepaya dari empat populasi pepaya di wilayah Bogor. Penelitian dilakukan di lahan petani. Buah yang diamati diambil dengan cara pengambilan contoh berdasarkan metode Purposive Random Sampling. Penelitian ini terdiri dari pengamatan kondisi umum kebun dan kondisi tanaman pepaya yang terdiri dari pengamatan peubah vegetatif, generatif dan kualitas buah. Pengamatan kondisi umum kebun, peubah vegetatif, dan peubah generatif dilakukan di empat kebun pepaya wilayah Bogor, yaitu di desa Cibodas kecamatan Bojong Genteng (Populasi 1), di desa Cibatok kecamatan Cibungbulang (Populasi 2). di desa Cibeuteung kecamatan Parung (Populasi 3), dan di desa Sukaraja kecamatan Sukaraja (Populasi 4) pada bulan Februari 2004. pengamatan kualitas buah dilakukan di laboratorium Pusat Kajian Buah-buahan Tropika pada bulan Maret- April 2004. Analisis data yang dilakukan yaitu Uji Kehomogenan Ragam, Analisis Cluster, dan Uji Korelasi. Berdasarkan peubah morfologi, populasi pepaya di desa Cibatok relatif lebih baik dan seragam jika dibandingkan dengan ketiga populasi lainnya karena memiliki jumlah daun banyak, panjang daun besar, lebar daun besar, panjang tangkai daun besar, dan diameter batang besar. ..
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Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition