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: Simulasi Sebaran Panas Tungku Sekam Berbentuk Kerucut Dalam Sistem Koordinat Konikal
Abstrak: Tungku sekam merupakan rangka bakar dengan berbahan bakar sekam padi. Secara umum, tungku sekam memiliki dua komponen geometri utama yaitu geometri silinder dan geometri kerucut. Geometri silinder digunakan sebagai sumber panas sedangkan kerucut sebagai tandon panas yang menyampaikan panas ke bagian lainnya. Transfer panas dan sebaran panas merupakan kejadian penting yang berhubungan dengan besar temperatur, kecepatan fluida, serta besar energi yang dihasilkan. Semakin besar temperatur, kecepatan fluida, dan energi yang angka dihasilkan suatu tungku maka sebaran panas pada tungku tersebut semakin baik. Sebaran panas tungku juga dipengaruhi oleh bentuk desain tungku. Profil sebaran panas tungku dapat diketahui dengan bantuan komputasi. Salah satu metode komputasi yang digunakan untuk mengetahui profil sebaran panas tungku adalah FDM (Finite Difference Method). FDM merupakan salah satu teknik numerik untuk menyelesaikan persamaan diferensial. Berdasarkan metode yang digunakan, telah dilakukan simulasi sebaran panas tungku sekam berbentuk kerucut dalam sistem koordinat konikal. Simulasi ini bertujuan mempelajari mekanisme transfer panas konduksi dan konveksi yang terjadi pada kerucut tungku. Simulasi dilakukan dengan cara menganalisis fenomena konduksi dan konveksi yang terjadi pada kerucut tungku sekam dengan temperatur awal diseluruh kerucut adalah temperatur ruang, temperatur bawah kerucut sebesar 700oC, dengan selang waktu 45 dan 60 detik. Melalui persamaan hantaran kalor yang dihitung secara numerik dengan metode FDM dihasilkan kecepatan aliran fluida konveksi selama 45 detik dan 60 detik adalah 13.69 m/s dan 11.90 m/s.
Keyword: Konduksi, konveksi, sebaran panas, FDM, sistem konikal koordinat

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