Judul: Simulasi Sebaran Panas pada Silinder Tungku Sekam dengan Berbantuan FDM(Finite Difference Method)
Abstrak: Simulation of heat distribution on cylinder furnace husks with FDM (Finite Difference Method) has been performed. These simulations is aimed to study the relationship between the velocity of fluid and the temperature at cylindrical furnace chaff. The simulations was done by analyzing the phenomena of the conduction and convection that occur in cylinder furnace husks with initial temperatures throughout cylindrical set at room temperature, and temperature under the cylinder is 491 oC for one minute. By calculating the numeric equation of heat transfer with FDM, fluid flow velocity convection with constant temperature in blanket cylinder during 1 minute is ranged between 3.32 to 13.75 m/s. In the same time, fluid flow velocity of convection with not constant temperature in blanket cylinder is ranged between 2.00 – 13.75 m/s.
Keyword: silinder tungku sekam, FDM, konveksi, konduksi, Sebaran panas

Judul: Development of Biomass Ladder Grate Furnace for Dryer Using Computational Fluid Dynamic (CFD).
Abstrak: Tungku pengering merupakan salah satu sumber panas yang digunakan untuk alat pengering. Tungku pengering digunakan karena dapat menggunakan bahan bakar yang berasal dari limbah pertanian tersebut, seperti jagung pipil dengan bonggolnya dan bahan bakar lainnya. Setiap bahan bakar memiliki karakteristik pembakaran yang berbeda, sehingga membutuhkan tungku yang spesifik. Salah satu cara untuk menganalisis performa tungku agar mendapat performa terbaiknya dengan menggunakan CFD. Tujuan penelitian ini untuk menganalisis performa tungku pengering tipe tangga dengan simulasi CFD menggunakan model pembakaran non-premixed dan membuat desain pengembangan tungku dengan simulasi berbagai variasi operasi. Penelitian ini mencakup tahap pengujian dan simulasi. Pengujian dilakukan untuk mendapatkan data suhu sebagai data validasi simulasi. Tungku yang digunakan berdimensi lebih kecil dari yang digunakan pada penelitian sebelumnya. Beberapa data untuk pengujian digunakan sebagai masukan simulasi seperti laju alir bahan, densitas bahan dan kecepatan udara. Pengujian dilakukan dengan tungku berdimensi 30 x 15 x 50 cm, dengan diameter screw conveyor, masukan udara dan outlet tungku sebesar 7.62, 3.8, dan 9 cm. Berdasarkan pengujian didapat rata – rata bulk density bonggol jagung, laju alir bahan dan kecepatan udara sebesar 151.6 g L-1, 4.07 kg jam-1 dan 7.5 m s-1. Rata – rata suhu keluaran didapat 646 ⁰C, dan pada dua titik di ruang pembakaran sebesar 711 ⁰C dan 581 ⁰C. Simulasi untuk validasi diawali dengan membandingkan tiga model turbulensi k-ε pada tungku desain I, yaitu k-ε standar, k-ε RNG, dan k-ε realizable. Dari ketiga model turbulensi didapat rata –rata akurasi tertinggi untuk suhu menggunakan model k-ε standar dengan rata – rata akurasi 89%, 83% untuk keluaran, 86 dan 98% untuk bagian dalam tungku. Berdasarkan model tersebut, dilakukan simulasi perbaikan desain tungku (tungku desain II) yaitu pengubahan perubahan posisi screw conveyor, penambahan pemasukan udara di depan pemasukan bahan dan sekat antara bagian jatuh bahan bakar dan ruang pembakaran. Berdasarkan hasil simulasi tungku desain II mampu menyelesaikan permasalahan pada tungku desain I dan mendapatkan peningkatan nilai panas dan efisiensi sistem sebesar 11.7%, dengan kondisi operasi yang sama., The dryer furnace is one of the heat sources used for dryer. The dryer furnace is chosen because the fuel can be utilized from the agricultural waste, such as corn with cobs and other fuels. Each fuel has different combustion characteristics and requires a specific furnace. One method to analyze the performance and get the best of it, is through CFD. The objectives of this study were to analyze the performance of the ladder type dryer furnace using CFD simulation with non-premixed combustion models and make furnace design improvement by simulating operating variations. This research includes test performance and simulation of a furnace. The test was performed to obtain temperature data as data validation. Dimensions of the furnace were smaller than in previous research. Some test data were used as input of simulation, such as material flow rate, material bulk density and air velocity. The furnace dimension was 30 x 15 x 50 cm, with diameter of screw conveyor, air inlet and furnace outlet was 7.62, 3.8, and 9 cm. Based on the test performance data, the average bulk density of corncobs, corncob flow rate and air velocity
Keyword: Corncob, CFD, Ladder grate furnace, non-premixed, Air Fule Ratio, Ansys Fluent, Computational Fluid Dynamic

Judul: Effects of Alcohol Consumption on Spatial Memory Performance and Neuron Complexity
Abstrak: Alcoholic beverages have always been a common drink all around the globe. The ethanol that is contained inside these alcoholic beverages have been known to have various negative side effects to the brain if consumed excessively. Other articles have claimed a certain moderate amount of alcohol consumption could have beneficial effects on the brain, but no exact concentration limit of consumption has been elaborated to cause damage in the hippocampal area. The objective of this research is examining the effects of alcohol towards neuron complexity and spatial memory performance. Four groups of mice were used as test subjects and were given the solution pre-orally. The first group is the control group which is given water, the second group was given 5% alcohol, the third group was given 15% alcohol, and the fourth group was given commercially sold alcoholic beverage. The mice were given said solutions in the span of 30 days. Spatial memory performance is observed by how a mice scores inside a Y-maze in the span of 5 minutes after 30 days of treatment. Neuron complexity is determined by the number of intersections of dendrites and the maximum angle of neurons inside the Dentate Gyrus (DG) and Cornu Ammonis (CA) region of the hippocampus which is observed by Golgi-Cox staining, photographed with optilab and then analyzed using the ImageJ application. alcohol consumption does not have any significant effect on spatial memory performance nor neuron complexity in the hippocampal area. These findings are not significantly different than the control group, possibly because the treatment is not chronic enough to trigger a significant physiological change.
Keyword: Ethanol, spatial memory, complexity, hippocampus