Judul: Pengembangan aplikasi AMMI dengan antarmuka ramah pengguna menggunakan R
Abstrak: AMMI (Additive Main Effect Multiplicative Interaction) model for interactions in two-way table provide the major mean for studying stability and adaptability through genotype × environment interaction (GEI). This study aimed to build a “user friendly” program to analyze AMMI called AMMIR (Additive Main Effect Multiplicative Interaction in R). The data used in this study was from “Konsorsium Padi Nasional” research and “Balai Penelitian Kacang- kacangan dan Umbi-umbian (Balitkabi) Departemen Pertanian RI” research. AMMIR performed a good result compare to other programs such as SAS, IrriStat and GenStat. The result showed that output AMMIR such as biplot and analysis of variance are exactly the same as the other programs.
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Judul: Pendugaan Daerah Kepercayaan dan Kestabilan Genotipe pada Model AMMI Menggunakan Metode Resampling Bootstrap
Abstrak: Additive Main Effects Multiplicative Interaction (AMMI) is the widely analysis used in understanding of genotype and environment interaction (GEI) in plant breeding research. The interpretation of AMMI based on biplot visualize the first two component of principle components analysis. Biplot of AMMI is only exploration analysis and it is not provide the hypothesis testing, so it can result the different interpretation by plant breeding researchers. The aim of this research is to find a systematic approach through bootstrap resampling method. Bootstrap resampling method on AMMI model produce confidence region of first two interaction principle component (􀜫􀜲􀜥1 and 􀜫􀜲􀜥2) for genotype and environment respectively. Bootstrap confidence region of 􀜫􀜲􀜥1 and 􀜫􀜲􀜥2 were estimate the stability of genotype, thus making the AMMI analysis more precise and realiable for characterization and selection of population for genetic environment.
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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