Judul: Penggolongan morfometrik jantan sapi bali, peranakan ongole dan pesisir melalui analisis diskriminan fisher, wald anderson dan jarak minimum D2 Mahalanobis
Abstrak: Indonesian local cattle as local cattle genetic resources require special attention for conservation purpose as well as meat-producing. Study on the morphometric characteristics of the local cattle Indonesia is one of the scientific information that can be used as the basic for development in conservation efforts. This study aimed was at characteristing the body size of male Bali, PO and Pesisir cattles. The experiment was conducted at Mitra Tani Farm; Rumah Pemotongan Hewan (RPH) Pancoran Mas, Depok and Balai Penyuluhan dan Peternakan Lengayang South Coastal District of West Sumatera. The animals observed were 32 Bali, 46 PO and 17 Pesisir cattles. Measurements include body length, chest width, chest depth, hearth girth, hip height, hip width, wither height, cannon circumference, thurl width, and rump length. Data were analyzed using descriptive analysis, T2 Hotelling analysis, Discriminant Fisher analysis, Wald-Anderson classification and minimum distance D2 Mahalanobis. The result of the analysis of T2 Hotelling and Discriminant Fisher analysis showed differences in body measurements of male PO vs Pesisir cattles, PO vs Bali cattles and Bali vs Pesisir cattles. Classification of Wald-Anderson analysis shows that there were classification error between PO vs Pesisir catlles and Bali vs Pesisir cattles, while the male PO vs Bali in the same classification. Minimum distance D2 Mahalanobis analysis showed the formation of the distance nonsimilaritas morphometric measurements bodies of PO vs Bali catlles for 5.379, PO vs Pesisir cattels for 5.383 and Bali vs Pesisir cattles for 5.54. Dendogram nonsimilaritas morphometric provided distribution of male body size cattle. Male PO and Bali cattles from one group and one male Pesisir cattle formed another group. Conclusions obtained in this study is the discovery of the classification of male Bali, PO and Pesisir cattles based on body measurements, thus providing information morphometric measures of closeness between a male cattle body.
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Judul: Analysis of Body Size Characteristics in Beef Cattle using Principal Component Analysis (PCA)
Abstrak: Penelitian ini bertujuan menganalisis morfometrik dan menentukan penciri utama pada sapi pejantan Peranakan Ongole (PO), Brahman, Angus dan Belgian Blue (BB) di Balai Inseminasi Buatan (BIB) Lembang. Total sampel yang digunakan dalam penelitian ini berjumlah 47 ekor sapi pejantan. Peubah ukuran-ukuran tubuh yang diamati terdiri atas tinggi pundak, panjang badan, tinggi pinggul, lebar pinggul, dalam dada, lingkar dada dan lebar dada. Data pengukuran ukuran-ukuran tubuh dikoleksi di BIB Lembang pada Maret 2021. Data ditabulasi dengan mengoreksi berdasarkan umur dan data dianalisis menggunakan uji t dan analisis komponen utama (AKU). Hasil uji t terhadap ukuran tubuh antara keempat bangsa sapi pejantan sebagian besar menunjukkan perbedaan (P<0.05). Adapun peubah penciri untuk sapi Brahman dan BB tidak memperlihatkan penciri khusus untuk ukuran tubuh. Penciri ukuran tubuh terdapat pada sapi PO, yaitu lebar dada, lebar pinggul, lingkar dada, dalam dada dan panjang badan. Penciri ukuran tubuh dari sapi Angus adalah lebar dada dan lebar pinggul. Hasil penelitian ini diharapkan dapat dijadikan sebagai informasi dasar dalam strategi program pemuliaan ke depan., This study aims to analyze the morphometrics and determine the main characteristics of Ongole Crossed, Brahman, Angus and Belgian Blue (BB) at the Institute for Artificial Insemination Lembang. The number of samples used in this study found 47 bulls. The variables of body measurements observed consisted of whithers height, body length, hip height, rump width, chest depth, chest girth, and chest width. The measurement data was taken in March 2021. Data were tabulated by correcting by age and data analysis using t-test and principal component analysis (PCA). The results of the t-test on body size between the four breeds of bulls mostly shows differences (P<0.05). Meanwhile, the characterizing variables for Brahman and BB cattle did not show specific characteristics for body size. Characteristics of body size found in PO cattle are chest width, hip width, chest girth, chest depth and body length. While Angus cattle are chest width and hip width. The results of this study are expected to be used as basic information in breeding program strategies.
Keyword: AKU, PCA, Ukuran Tubuh, sapi pedaging, Body Size, Beef Cattle

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