Judul: Study on Size and Body Shape of Kampung Chicken, Pelung Chicken and Its Crossbred
Abstrak: Kinds of local chickens in Indonesia are Kampung chicken, Pelung chicken and its cross bred (Nagrak chicken). Kampung chicken is prefered by the people because of its crisp meat and its resistance to desease and easiness of its maintenance. Pe1ung chicken is prefered by the people because it has long and deep voice, and the fast growth. Nagrak chicken is cross bred of Pelung chicken and Kampung chicken where is done in Nagrak Sukabumi. This research was carried out in three villages: Ciherang village Bogor, Nagrak village Sukaburni and Tegallega village Cianjur. The research was conducted April to June 2001. Data was analyzed until Mei 2002.
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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: Permeabilitas Metanol pada Membrane Electrode Assembly Nafion Terkompositkan TiO2
Abstrak: Sel bahan bakar metanol merupakan salah satu energi transisi yang dapat mengurangi emisi karbon. Komponen utama dalam sel bahan bakar metanol adalah membran polimer elektrolit (PEM). Nafion kerap digunakan sebagai PEM. Namun, kerap terjadi permeabilitas metanol. Pengisi anorganik, seperti TiO2 mampu meminimumkan permeabilitas metanol pada nafion. Penelitian ini bertujuan memodifikasi nafion menjadi membrane electrode assembly (MEA) menggunakan pengisi TiO2 dan melihat pengaruh modifikasi membran terhadap permeabilitas metanol pada membran.Permeabilitas metanol terendah didapatkan oleh MEA Nafion-TiO2 sebesar 4×10-6 cm2.s-1dengan konsentrasi metanol 15% sedangkan permeabilitas metanol tertinggi yang didapatkan adalah 2×10-5 cm2.s-1 oleh MEA Nafion murni dengan konsentrasi metanol 10%. Hasil ini menunjukan bahwa nafion yang dimodifikasi menjadi MEA dengan penambahan pengisi TiO2 akan menurunkan nilai permeabilitas metanol pada membran, Methanol fuel cells are a transition energy that can reduce carbon emissions. The main component in a methanol fuel cell is a polymer electrolyte membrane (PEM). Nafion is often used as PEM. However, methanol permeability often occurs. Inorganic fillers, such as TiO2 , can minimize methanol permeability in nafion. This research aims to modify nafion into a membrane electrode assembly (MEA) using TiO2 filler and see the effect of membrane modification on the methanol permeability of the membrane. The lowest methanol permeability was obtained by MEA Nafion-TiO2 of 4×10-6 cm2.s-1 with a methanol concentration of 15%, while the highest methanol permeability obtained was 2×10-5 cm2.s-1 by MEA pure Nafion with a methanol concentration of 10 %. These results prove that nafion modified into MEA by adding TiO2 filler will reduce the methanolpermeability value of the membrane.
Keyword: MEA, methanol permeability, nafion, titanium dioxide