Judul: Perbandingan Ukuran dan Bentuk Morfometrik Permukaan Kepala Beberapa Domba Lokal Indonesia
Abstrak: The aim of this research was to compare the head size and shape of thin-tailed sheep (domba ekor tipis or DET), batur, wonosobo, and garut sheep (fighting and meat types). The variables measured were akrokranion-prosthion (X1), basion-prosthion (X2), mandibular (X3), head height (X4), facial tuber (X5), nasion-rhinion (X6), entorbitale (X7), euryon (X8), supraorbitale (X9). There were 111 heads of local sheep that used in research (32 rams and 79 ewes). Data were analyzed by descriptive statistics, T2-Hotelling and principal component analysis. Differences of head size surface among breeds were found in this experiment. The head size discrimination of the DET and garut meat type was basion-prosthion, since the eigen vektors are +0912 and +0928, respectively. The head size discrimination of the batur and wonosobo sheep was akrokranion-prosthion that their eigen vektors are +0969 and +0902 respectively. The head shape discrimination of DET, wonosobo and garut meat type were mandibular which those eigen vektors are +0904, +0836, and +0965 respectively. The head shape discrimination of Batur sheep was head height with the value of eigen vektor is +0907. The head size and shape discriminations on garut fighting type sheep was head hight with eigen vektor values are +0905 and -0406. Data clustered between garut fighting and meat types was separated. It also happened between batur sheep and wonosobo sheep. Overlaping data was found on DET, garut fighting-type, wonosobo and batur sheep.
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Judul: Variabel pembeda morfometrik ukuran permukaan kepala antara domba betina ekor tipis batur Wonosobo dan Garut
Abstrak: Morfometrik kepala domba bersifat khas dan merupakan karakteristik tersendiri pada setiap jenis domba. Penelitian ini bertujuan untuk menganalisis dan mengidentifikasi perbedaan morfometrik kepala domba betina antara Domba Ekor Tipis (DET), domba Batur, domba Wonosobo, domba Garut Tangkas dan domba Garut Pedaging. Variabel-variabel yang diamati meliputi akrokranionprosthion, basion-prosthion, rahang bawah, tinggi kepala, tuber facial kiri-kanan, nasion-rhinion, entorbitale kiri-kanan, euryon kiri-kanan dan supraorbitale kiri kanan. Ternak yang digunakan berjumlah 79 ekor. Analisis data menggunakan statistik deskriptif, statistik T2 -Hotelling, analisis diskriminan Fisher, WaldAnderson dan jarak minimum D2 -Mahalanobis. Hasil penelitian menunjukkan bahwa nasion-rhinion ditemukan sebagai variabel pembeda antara DET vs Batur. Akrokranion-prosthion, basion-prosthion, tinggi kepala dan nasion-rhinion adalah variabel pembeda antara DET vs Wonosobo dan antara DET vs Garut Tangkas. Basion-prosthion merupakan variabel pembeda antara DET vs Garut Pedaging. Nasion-rhinion adalah variabel pembeda antara Batur vs Garut Tangkas, dan variabel pembeda antara Batur vs Garut Pedaging. Jarak minimun D2 - Mahalanobis atau jarak ketidakserupaan morfometrik antara DET vs Batur sebesar 5.836, DET vs Wonosobo 5.729, DET vs Garut Tangkas 3.076, antara DET vs Garut Pedaging 2.523, antara Batur vs Garut Tangkas 2.285, antara Batur vs Garut Pedaging 3.605. DET membentuk kelompok terpisah dari domba lainnya, domba Garut dan Wonosobo memiliki hubungan ketidakserupaan morfometrik yang dekat.
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Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition