Judul: Studi korelasi berat badan, jarak pubis, panjang abdomen dan panjang shank terhadap produksi telur pada puyuh (Coturnix coturnix japonica)
Abstrak: The aim of this research is to examine whether quail's egg production can be measured by observing phenotypic characteristic. Eggs' length, width, and weight, de from quail's body weight, distance between pubic bones, length of abdomen. and length of shank were measured as variables. The measurement of eggs" variables are conducted each day. while in the case of quails these are done each week. The results were analyzed statistically.
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Judul: Performa Produksi dan Kualitas Telur Puyuh (Coturnix-coturnix japonica) pada Kepadatan Kandang yang Berbeda
Abstrak: Stocking density is one of important environmental factor which is need to be considered in generating good production and quality of japanese quail (Coturnix-coturnix japonica) egg. This study was aimed to investigate the effects of various stocking density and determine the most optimum cage density on production and quality of quail egg. A total of 135 of japanese quails were used in this study. The quails were kept in cages with a stocking density of 12 birds, 15 birds, and 18 birds on 62 x 50 x 26 cm cages and each level of treatment consisted of 3 replications. Feed consumption, feed conversion ratio, hen day egg production, average egg weight, and mortality rate were recorded. Egg weight, shell weight, shell thickness, yolk colour, Haugh Unit (HU), and yolk index were also investigated. The obtained data were analyzed by using Analysis of Variance (ANOVA). Data of hen day production and feed conversion were presented descriptively. All traits were not different among treatments. The quails were kept in cages with a stocking density of 12 birds revealed the most optimum egg production according to the data of hen day production and feed conversion.
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Judul: Ab Initio Study of Borophene-Graphene Heterostructure Properties as Anode of Natrium Ion Battery
Abstrak: Penggunaan baterai sebagai perangkat penyimpanan energi hampir digunakan pada semua perangkat elektronik. Baterai adalah sel elektrokimia yang terdiri dari sepasang elektroda (katoda-anoda) dan elektrolit, sel ini berfungsi sebagai sumber energi listrik. Konsumsi lithium pada tahun 2017 meningkat dan permintaan LCE (Lithium Carbonate Equivalent) mencapai 214 KT dimana 41% digunakan pada industri baterai Baterai Na-ion mendapat perhatian lebih sebagai alternatif dalam mengatasi keterbatasan pengadaaan dari Lithium. Penelitian ini menggunakan Density Functional Theory untuk mengetahui nilai adsorpsi, kapasitas dan jarak interspasial kandidat anoda yaitu heterostruktur Borofena-Grafena dengan ion Na. Hasil penelitian menunjukkan bahwa heterostruktur borofena-grafena memiliki jarak interlayer yang cukup untuk menampung interkalasi Na. Energi adsorpsi Na terbesar sebesar -2,02 eV terjadi pada interlayer heterostruktur. Dengan energi adsorpsi tersebuat dapat menghasilkan kapasitas energi maksimum sekitar 693 mAh g^(-1). Energi aktivasi mobilitas ion Na pada heterostruktur kurang dari 0.2 eV, hal ini menunjukkan tingginya difusivitas ion Na pada anoda heterostruktur Borofena-Grafena., Most of battery utilization as energy storage use in most electronic device. Battery is electrochemical cell that consist of electrode (Cathode-Anode) and electrolite, this cell is used as electrical source. Comsumption of Lithium in 2017 increased and LCE (Litium Carbonate Equivalent) demand reach 214 KT which 41% used in battery industries. Natrium ion battery has an attention as the alternate in solving availability challenge of Lithium. This research use Density Functional Theory to understand adsorption value, capacity and interlayer distance for the next anode for Na ion, borophene-graphene heterostructures. The results show that the heterostructure borophene-graphene has a sufficient interlayer distance to accommodate Na-intercalation. The largest Na adsorption energy is -2.02 eV occurs in the interspace heterostructure. Thus it can produce a maximum energy capacity of about 693 mAh g^(-1)The activation energy of Na ion mobility in the heterostructure is less than 0.2 eV, this indicates high diffusivity of Na ion in the borophene-graphene heterostructure anode.
Keyword: Adsorption Energy, Anode, Borophene-Graphene, DFT