Judul: Implementasi Penyelesaian Persamaan Burgers dengan Metode Beda Hingga dalam Bahasa Pemrograman Julia
Abstrak: Persamaan Burgers merupakan salah satu persamaan diferensial parsial yang digunakan untuk memodelkan beberapa kejadian yang berkaitan dengan fluida. Karya ilmiah ini membahas tentang penyelesaian persamaan Burgers dengan metode beda hingga. Dalam karya ilmiah ini, telah diketahui beberapa parameter bagi persamaan Burgers dan digunakan beberapa kasus partisi dalam metode beda hingga. Berdasarkan hasil yang diperoleh dapat diketahui bahwa semakin banyak partisi yang digunakan maka hasil numerik yang didapatkan akan semakin mendekati hasil eksaknya. Pada karya ilmiah ini, perhitungan secara numerik dilakukan dengan bantuan bahasa pemrograman Julia., Burgers equation is one of the partial differential equations used to modelling several events related to fluids. This study discusses solving burgers equations with the finite difference method. Several parameters have been known for the Burgers equation and several cases of partitions are used in finite difference methods. Based on the result obtained, it can be seen that the more partitions used, the numerical result obtained will be closer to the exact result. In this study, calculations are numerically carried out with the help of Julia programming language.
Keyword: Julia, metode beda hingga, persamaan diferensial parsial, persamaan Burgers, Burgers equation, finite difference method, partial differential equation

Judul: Penggunaan Metode Perturbasi Homotopi untuk Menyelesaikan Persamaan Burgers dan Penerapannya pada Masalah Arus Lalu Lintas
Abstrak: Traffic flow problems are frequently referred as problems of congestion, accidents and traffic violations. Traffic accidents often occur because the vehicle drivers can not control the speed of their vehicle. One of the efforts that must be made by the vehicle drivers to control the speed of their vehicle is driving under the road speed limit. On this traffic flow problems, the road speed limit will be assessed based on the Burgers equation. The Burgers equation can be solved by the homotopy perturbation methods. The results of the homotopy perturbation method will be compared to the results of numerical methods.
Keyword: traffic flow problems, homotopy perturbation method, Burgers equation

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