Judul: Studi Morfometrik Pendugaan Bobot Badan Ayam Kampung di Ciamis, Tegal dan Blitar Melalui Analisis Regresi Komponen Utama
Abstrak: Kampong chicken is one of the local chicken in Indonesia which spread across the region. The spread of Kampong chicken in Ciamis, Tegal and Blitar can give andescriptionthe diversity of body size and body weight Kampong chicken on the island of Java. This study aims to determine the relationship between linear measures of body surface to body weight and body weight of chickens suspected Kampung based measurements at the observation site Ciamis, Tegal and Blitar. T2-Hotelling statistic is used to determine the difference in linear measures of body Kampong chickens were observed. T2-Hotelling statistic results showed that Kampong chickens are observed very different from one another. Difference is due to differences environment and the decision of farmers selecting. Principal Component Regression Analysis (ARKU) was used to estimate weight based on linear measures of body Kampong chickens were observed. The results of statistical calculations show that the 12 variables observed to be very influential on the weight of Kampong chicken Ciamis, Tegal and Blitar, both in males and females. The highest elasticity values obtained in the village of Ciamis male chicken is a shank length of 0,311, while the male village of Tegal chicken and Blitar contained in the variable width of the chest amounted to 0,378 and 0,437. Kampong chicken in location Blitar and Ciamis, females have the highest elasticity value in the variable shank circumference;, each of which is obtained for 0,327; 0,333, while in the village of Tegal chicken females have the highest elasticity value in the variable length of the third finger of 0,228. The highest elasticity values should not be used as reference in the estimation of body weight. increase in the % of variable can be used to predict the observed increase in body weight percentage of the value of elasticity obtained. Practicality of estimating body weight in the field are preferred
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Judul: Studi Ukuran dan Bentuk Tubuh Ayam Kampung di Ciamis, Tegal dan Blitar
Abstrak: The purpose of this research is to identify the size and shape of the body using 328 Kampong chickens (45 males and 56 females from Ciamis; 20 males and 89 females from Tegal; 38 males and 80 females from Blitar). Differences of linear measurements of body surface of Kampong chicken from Ciamis, Tegal and Blitar was analyzed using descriptive analysis was tested with statistics T2 -Hotelling. The size and body shape of the Kampong chickens was be determined through a principal component analysis. The differences of sizes using a linear measurement of the body surface indicated that Kampong chickens from Ciamis were type that are more towards broiler type; Kampong chickens from Tegal were more toward laying hen type; and Kampong chickens from Blitar were more towards laying hens and broiler chickens type. The differences of linear variable of body size were found between two Kampong chicken group based on T2 -Hotelling statistical test (P<0,01). The result of principal component analysis shows that the Eigen values of Kampong Chickens from Ciamis, Tegal and Blitar sizes were found by the length of tibia (with Eigen vector were 0,562; 0,583 and 0,561 respectively) with correlation coefficient of size +0,789; +0,730 and +0,817 respectively. Tarsometatarsus lengths were also being found as a marker size of Kampong chicken from Blitar with Eigen vector 0,625 and correlation coefficient of size +0,829. Eigen value of shape of Kampong chickens from Ciamis and Kampong chickens from Tegal found by the length of femur were 0,547; 0,620 respectively and with correlation coefficient of shape +0,563; +0,694 while Eigen value of the length of tibia were 0,580; 0,607 respectively with the correlation coefficient of shape 􀵆0,499; 􀵆0,598. Eigen vector value of shape Blitar Kampong chicken was determined by the length of the femur and the wing length with the Eigen vectors were 0,603 and 0,625 respectively and the correlation coefficient of shape +0,652 and +0,674.
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Judul: Nanokristalin Pirit (FeS2) sebagai Material Semikonduktor Fotovoltaik.
Abstrak: Teknologi fotovoltaik adalah suatu proses yang dapat mengubah sinar matahari menjadi energi listrik dengan media semikonduktor. Penggunaan sel surya untuk fotovoltaik hanya dapat mengonversi radiasi matahari menjadi energi listrik kurang dari 20%. Efisiensi akan meningkat ketika material semikonduktor untuk fotovoltaik dibuat menjadi ukuran nano. Pirit merupakan salah satu material semikonduktor fotovoltaik yang memiliki energi pita celah (Eg) dalam kisaran 0.8–0.95 eV. Energi pita celah tersebut terbukti meningkat ketika disintesis dengan metode hidrotermal menggunakan beragam molar [S]:[Fe] pada suhu 200 °C dalam 24 jam. Nilai energi pita celah yang dihasilkan adalah 1.58–2.073 eV. Ukuran nanokristalin pirit yang dihasilkan berada pada kisaran 21.04–58.77 nm menurut data Particle Size Analyzer. Besarnya ukuran nanokristal pirit yang tumbuh kurang dari 50 nm merupakan poin penting untuk aplikasi fotovoltaik.
Keyword: Hidrotermal, fotovoltaik, nanokristal, pirit