Judul: Pengujiau Tahanan Tarik (Draft) Bajak Subsoil Getar Dengan Dua Bilah Bajak
Abstrak: Kegiatan pengolahan tanah terutama pada pengolahan tanah subsoil (subsoiling) paling banyak memerlukan tenaga di antara kegiatan-kegiatan budidaya tanaman. Karena tahanan tarik pada pengolahan tanah subsoil sangat besar, maka perlu diusahakan untuk memperkecil tahanan tarik tersebul. Salah satu usaha untuk memperkecil tahanan tarik bajak subsoil adalah dengan penggunaan getaran (osilasi) melalui pemanfaatan PTO traktor. Secara umum mekanisme penggetaran pada bajak subsoil dewasa ini banyak menggunakan gearbox sebagai pengubah arah putaran poros yang tegak lurus satu sama lainnya. Dalam penelitian sebelumnya telah dirancang bajak subsoil dengan mekanisme kombinasi poros eksentrik dan engkol.
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Judul: Perubahan Tahanan Tarik (Draft) Pembajakan pada Perubahan Kadar Air dan Kedalaman Olah Menggunakan Berbagai Jenis Bahan dan Ukuran Panjang Landside Bajak Singkal
Abstrak: Pengolahan tanah merupakan salah satu kegiatan yang selalu dilakukan dalam budidaya pertanian. Kesesuaian antara kondisi tanah dengan alat dan mesin pengolah tanah yang digunakan akan menentukan keberhasilan pengolahan tanah. Untuk meningkatkan kapasitas dan efisiensi kerja serta mutu dari tanah yang diolah maka digunakan traktor sebagai sumber tenaga tarik. Agar tenaga yang diberikan oleh traktor dapat dimanfaatkan secara optimal dalam penggunaan bajak pada kondisi tanah tertentu, maka perlu diketahui faktor yang berperan dalam menentukan besarnya kebutuhan tenaga traktor saat pengolahan tanah.
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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