Judul: Estimation of Chicken Body Weight IPB-D2 and IPB-D3 in Grower Period Based on Principal Component Regression Analysis
Abstrak: Ayam IPB-D2 dan ayam IPB-D3 merupakan hasil seleksi dari ayam IPB-D1 berdasarkan sifat tahan penyakit dan pertumbuhan bobot badan cepat. Penelitian ini bertujuan untuk mendapatkan persamaan pendugaan bobot badan berdasarkan delapan variabel permukaan tubuh linear. Berdasarkan persamaan tersebut ditentukan variabel yang paling lentur terhadap perubahan bobot badan ayam IPB D2 dan IPB-D3. Metode penelitian yang digunakan adalah Analisis Regresi Komponen Utama (ARKU). Penelitian ini menggunakan ayam IPB-D2 dan IPB D3 umur 10 minggu dengan total sebanyak 90 ekor. Variabel-variabel ukuran permukaan tubuh linear yang diukur yaitu panjang femur (X1), panjang tibia (X2), panjang tarsometatarsus (X3), lingkar tarsometatarsus (X4), panjang jari ketiga (X5), panjang sayap (X6), panjang maxilla (X7), dan tinggi jengger (X8). Semua variabel yang diamati berpengaruh nyata terdahap bobot badan sehingga persamaan pendugaan bobot badan memasukkan semua variabel. Panjang sayap (X6) merupakan variabel yang paling berpengaruh terhadap perubahan bobot badan pada ayam IPB-D2 dan IPB-D3., IPB-D2 chickens and IPB-D3 chickens are the result of selection from IPB-D1 chickens based on disease resistance characteristics and fast body weight growth. This study aims to obtain an equation for estimating body weight based on eight linear body surface variables. Based on this equation, it was determined that the most flexible variable to changes in body weight of IPB-D2 and IPB-D3 chickens. The research method used is Principal Component Regression Analysis (ARKU). This study used IPB-D2 and IPB-D3 chickens aged 10 weeks with a total of 90 chickens. The linear body surface size variables measured were femur length (X1), tibia length (X2), tarsometatarsus length (X3), tarsometatarsus circumference (X4), third finger length (X5), wing length (X6), maxilla length ( X7), and comb height (X8). All the variables have a real impact to bodyweight so that bodyweight estimation equations include all variables. Wing length (X6) is the most influential variable on body weight of IPB-D2 and IPB-D3 chickens.
Keyword: bodyweight estimation, IPB-D2 line chickens, IPB-D3 line chickens, principal component regression

Judul: Discriminating Variables Body Surface Size of IPB-D1, IPB-D2, and IPB-D3 Mature Chickens based on Discriminant Analysis
Abstrak: Ayam IPB-D2 dan IPB-D3 merupakan hasil seleksi IPB-D1 berdasarkan ketahanan penyakit dan bobot badan cepat. Penelitian ini bertujuan menentukan variabel pembeda ukuran permukaan tubuh linear ayam IPB-D1, IPB-D2, dan IPBD3. Pengukuran permukaan tubuh linear terdiri atas panjang femur (X1), panjang tibia (X2), panjang tarsometatarsus (X3), lingkar tarsometatarsus (X4), panjang jari ketiga (X5), panjang sayap (X6), panjang maxilla (X7), dan tinggi jengger (X8). Metode penelitian ini menggunakan analisis diskriminan dan kriteria Wald-Anderson. Variabel pembeda ayam IPB-D1 jantan vs IPB-D2 jantan adalah X1, X3, X4, X6, dan X8, serta IPB-D1 jantan vs IPB-D3 jantan adalah X1, X3, X4, X6, dan X7. Persamaan diskriminan ayam IPB-D1 jantan vs IPB-D2 jantan adalah Ŷ=−0,08X1+0,09X3−0,27X4−0,03X6−0,06X8, serta IPB-D1 jantan dan IPB-D3 jantan adalah Ŷ=−0,03X1+0,14X3−0,35X4−0,02X6−0,44X7. Klasifikasi data individu ayam IPB-D1 jantan vs IPB-D2 jantan menunjukkan tidak tepat sebanyak 14 ekor IPB-D1 dan 6 ekor IPB-D2, sedangkan ayam IPB-D1 jantan vs IPB-D3 jantan menunjukkan sebanyak 16 ekor IPB-D1 dan 5 ekor IPB-D3., IPB-D2 and IPB-D3 chickens are the result of IPB-D1 selection based on disease resistance and fast body weight. This study aims to determine the variables that distinguish the size of the linear body surface of IPB-D1, IPB-D2, and IPB-D3 chickens. Linear body surface measurements consisted of femur length (X1), tibia length (X2), tarsometatarsus length (X3), tarsometatarsus circumference (X4), third finger length (X5), wing length (X6), maxilla length (X7), and comb height (X8). This research method uses discriminant analysis and Wald-Anderson criteria. Variables distinguishing IPB-D1 male vs IPB-D2 male are X1, X3, X4, X6, and X8, and IPB-D1 male vs IPB-D3 male are X1, X3, X4, X6, and X7. The discriminant equation of IPB-D1 male vs IPB-D2 male is Ŷ=−0,08X1+0,09X3−0,27X4−0,03X6−0,06X8, IPB-D1 male vs IPB-D3 male is Ŷ=−0,03X1+0,14X3−0,35X4−0,02X6−0,44X7. Data classification of individual IPB-D1 male vs IPB-D2 male showed 14 chickens of IPB-D1 and 6 chickens of IPB-D2 inaccurate, while IPB-D1 male vs IPB-D3 male showed 16 chickens of IPB-D1 and 5 chickens of IPB-D3.
Keyword: discriminant, discriminating variable, IPB-D1, IPB-D2, IPB-D3

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4