Judul: Mempelajari proses pengeringan gabah pada alat pengering type "Self Emptying In-Bin Dryer"
Abstrak: Peningkatan produksi beras memerlukan penyediaan sarana produksi pertanian yang mencukupi, diantaranya adalah benih padi. Penyediaan benih unggul yang bermutu baik memerlukan penenganan prapanen dan pasca panen yang baik. Salah satu rangkaian proses pengolahan benih adalah pengeringan. Matahari merupakan sumber energi utama di alam dan tersedia secara cuma-cuma. Pengering energi surya "self emptying in-bin dryer" adalah salah satu pengering buatan yang memanfaatkan energi matahari sebagai sumber panas utamanya. Penelitian ini bertujuan untuk mengetahui performansi pengering energi surya "self emptyingin-bin dryer" dalam proses pengeringan benih padi. Pengeringan dilakukan dengan tiga cara, yaitu secara kontinyu pada kapasitas 2 ton, secara intermitten pada kapasitas 2 ton, serta secara intermitten pada kapasitas 4 ton. Masing-masing percobaan dilakukan dua kali. Pengeringan secara kontinyu menggunakan sistem hibrid, yaitu dengan menggunakan elemen pemanas listrik (heater) sebagai sumber panas tambahan yang digunakan pada waktu malam hari dan saat cuaca mendung. Pengeringan secara intermitten merupakan pengeringan energi surya pasif, yaitu hanya memanfaatkan radiasi surya sebagai sumber panas…dst
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Judul: Analisis performansi pengering energi surya Selfemptying In - Bin Dryer untuk penangkar benih padi
Abstrak: Peningkatan produksi beras serta makin tingginya kesa- daran petani untuk meningkatkan produktivitas sawahnya me- merlukan penyediaan sarana produksi pertanian yang mencu- kupi, diantaranya adalah benih padi. Penyediaan benih unggul yang bermutu baik memerlukan penanganan pra-panen dan pasca panen yang baik. Pengering- an benih merupakan salah satu rangkaian proses pengolahan benih. Pengeringan benih dapat dilakukan dengan menggunakan pengering alami maupun pengering buatan. Pengering energi surya "selfemptying in-bin dryer" adalah salah satu penge- ring buatan yang menggunakan energi surya sebagai sumber panas utamanya. Penelitian ini bertujuan untuk 1) mengkaji performansi pengering energi surya "selfemptying in-bin dryer" untuk proses pengeringan benih padi IR-64, 2) melakukan analisis performansi pengering energi surya "selfemptying in-bin dry- er", dan 3) membandingkan performansi pengering energi surya "selfemptying in-bin dryer" terhadap pengering kontinyu ...
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Judul: Quantitative Trait Loci Mapping for Trait in Categorical Scale
Abstrak: Genes or regions on chromosome underlying a quantitative trait are called Quantitative Trait Loci (QTL). Characterizing genes controlling quantitative trait on their position in chromosome and their effect on trait is through a process called QTL mapping. In estimating the QTL position and its effect, QTL mapping basically utilize the association between QTL and DNA markers. However, many important traits are obtained in categorical scale, such as resistance from certain disease. From a theoretical point of view, QTL mapping method assuming continuous trait could not be applied to categorical trait. This research was focusing on the assessment of the performance of Maximum Likelihood (ML) and Regression (REG) approach employed in QTL mapping as well as the performance of Lander and Botstein (LB) and Piepho method in determining critical value in testing the existence of QTL for binary and ordinal trait by means of simulation study. The simulation study to evaluate the performance of ML and REG approach was conducted by taking into account several factors that may affecting the performance of both approaches. The factors are: (1) marker density; (2) QTL effect; (3) sample size; (4) shape of phenotypic distribution; (5) number of categories; and (6) number of QTL. Moreover, the simulation study for evaluating LB and Piepho method in determining critical value was conducted by generating distribution of the test statistic under null hypothesis. From simulation study, it was obtained that LB and Piepho method showing similar performance in determining critical value in testing the existence of QTL for binary and ordinal trait. The simulation study also indicating that both methods could be used in determining critical value in QTL mapping analysis for binary trait as well as for ordinal trait if the REG approach is used but not if ML approach is used due to their poor performance. In assessing the performance of ML and REG approach in QTL mapping analysis for binary trait, the two approaches showing comparable performance; whereas for ordinal trait REG approach showing poor performance compared with ML approach in estimating thresholds. As a result, in QTL mapping analysis, ML and REG approach could be used when dealing with binary trait, whereas ML approach is suggested when dealing with ordinal trait.
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