Judul: Analisis Pindah Panas pada Alat Pengering Surya Hibrida
Abstrak: Alat pengering surya hibrid memanfaatkan energi surya dan biomassa sebagai usaha diversivikasi sumberdaya energi. Bentuk Kolektor di atas ruang pengering yang didalamnya berisi rak-rak dirancang mampu meningkatkan kapasiatas produksi sampai 21,5 kg/m².
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Judul: Disain alat pengering energi surya dengan gudang penyimpanan panas
Abstrak: Penelitian ini bertujuan mendisain dan mempelajari performansi prototipe alat pengering energi surya dengan gudang penyimpan panas, yang merupakan usaha peningkatan pendayagunaan energi surya untuk proses pengeringan hasil pertanian secara lebih baik. Peningkatan pendayagunaan energi surya yang diharapkan meliputi peningkatan efisiensi dan mutu pengeringan, serta perpanjangan waktu kerja alat sampai lewat surya terbenam. Alat pengering energi surya dengan gudang penyimpan panas berkapasitas 30 kg telah dirancang dan dibuat di bengkel Pusat Pengembangan Teknologi Pangan (FTDC), IPB. Alat tersebut memiliki pengumpul panas tipe pelat datar dengan medium udara seluas 2.83 m² dan mengguna kan sirkulasi udara secara paksa. Ukuran alat keseluruhan adalah 3.16 m x 1.20 m x 2.30 m. Pengujian alat dilakukan dengan menggunakan bahan kacang tanah dalam polong pada 4 tingkatan laju aliran udara. Pengamatan dilakukan terhadap efisiensi pengumpulan panas, efek gudang penyimpan panas dalam meredam fluktuasi suhu dan memperpanjang waktu kerja alat, karakteristik suhu bahan selama pengeringan, laju pengeringan, dan efisiensi pengeringan.
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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