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: Kajian Perbedaan Ukuran Morfometrik Tubuh Ayam Kampung dan Ayam Pelung serta Ayam Nagrak (Persilangan Ayam Kampung dan Pelung)
Abstrak: This research use a secondary data from Rahmat Mufti. The variables which measured were shank length, tibia length, femur length, shank circumference, third finger length, comb tall, maxilla length and wing length. T2-Hotelling test show that there were the differentiation of kampong, nagrak and pelung male chiken (P<0.01), also were seen in group female chiken between kampong and nagrak chiken and between kampong and pelung chiken (P<0.01). The similarity were seen in group female chiken between nagrak and pelung chiken (P>0.05). Fisher discriminant analysis proved the distinguishing were seen in all variables between male group of kampong and nagrak chiken excepted femur length; whereas between male group of kampong and pelung chiken the distinguishing seen in all variables accepted shank femur length. The distinguishing variables between male group of nagrak and pelung chicken were maxilla length. The distinguishing seen in all variables between female group of kampong and nagrak chiken excepted femur length and maxilla length; whereas between female group of kampong and pelung chiken the distinguishing seen in all variables accepted shank length and femur length. The distinguishing variables were unseen between female group of nagrak and pelung chicken. Correction factor based on Wald-Anderson criteria was 100% in group male chikens beetwen kampong and nagrak, and also beetwen kampong and pelung. Correction factor based on Wald-Anderson criteria beetwen nagrak and pelung male chikens was 82%. Correction factor based on Wald-Anderson criteria in all group female chikens was 100% excepted beetwen nagrak and pelung.
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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