Lennard-Jones potential is the potential energy of the bond interaction between two atoms or free molecules based on the distance between them. Molecular dynamics simulations can be used to calculate various physical properties of materials based on specific interaction potentials. One of the physical properties of a material is its melting point. This research was conducted to find the potential parameter values of Lennard-Jones metal Fe, Pb, Ni and Cr based on the melting point value of the material using the LAMMPS program. In this study the normalization of potential parameters is done by comparing the results of the simulation melting point with the experimental melting point. This research produces a Lennard-Jones potential parameter value which yields a melting point value that has a relatively small description.
Comparison of thorium nitride (ThN) and uranium nitride (UN) fuel on small modular PWR in neutronic analysis has been carried out. PWR in module is one type of reactor that can be utilized because of its small size so that it can be placed on demand. Neutronic calculations were performed using SRAC version 2006, the data library using JENDL 4.0. The first calculation was fuel pin (PIJ) calculation with hexagonal fuel pin cell type. And the second calculation was reactor core (CITATION) calculation using homogeneous and heterogeneous core configurations. ThN and UN fuels use heterogeneous configurations with 3 fuel variations. The reactor geometry was used in two fuels are the same, with diameter and height active core was 300 cm and 100 cm. In this research, Np-237 was added as a minor actinide in the UN fuel to reduce the amount of Np-237 in the world and also reduce the k-eff value. For ThN fuel, Pa-231 also added in the fuel to reduce the k-eff value. The optimum configuration of UN fuel reached when used heterogeneous core configuration case four with percentage of U-235 in F1=5.5 %, F2=7 % and F3=8.5 % also with the addition of Np-237 0.2 % and fuel fraction 56 %. It has a maximum excess reactivity value 12.56 % %∆k/k. And then, the optimum configuration of ThN fuel reached when used heterogeneous core configuration case three with percentage of U-233 in F1=2 %, F2=4 % and F3=6 % with the addition of Pa-231 0.5 % and fuel fraction 53 %. It has a maximum excess reactivity value 7.67 % %∆k/k. The comparison of optimum design of UN and ThN fuel shows that the ThN fuel has the k-eff value closer to critical than UN fuel. Therefore, in this study, ThN fuel is more suitable for use in PWR reactors because it has a small excess value and can operate for 10 years without refueling
<p>Telah berhasil dilakukan sintesis mermbran komposit nilon-arang dengan menggunakan bahan dari limbah benang nilon dan arang ampas tebu. Hasil penelitian menunjukkan bahwa membran komposit nilon-arang dengan bobot benang nilon 6,0 g dan arang 0,75 g adalah yang paling baik karena larutan yang terbentuk homogen, kental, mudah dicetak, permukaan membran halus dan tidak terdapat rongga udara. Berdasarkan karakterisasi FTIR pada membran komposit nilon-arang memperlihatkan adanya gugus fungsi hidrokarbon yang berasal dari arang ampas tebu dan gugus fungsi amida yang berasal dari benang nilon.Sehingga membran yang terbentuk masih memiliki komponen asli penyusunnya. Sedangkan dari karakterisasi SEM terlihat bahwa morfologi permukaan membran komposit nilon-arang yang dihasilkan termasuk membran mikrofiltrasi dengan ukuran pori 4,75 μm.</p>
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