Numerical study on the effects of absorptivity on performance of flat plate solar collector of a water heater von Tambunan, D R S., Sibagariang, Y P, Ambarita, H, Napitupulu, F H, Kawai, H

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Influence of the weighing bar size to determine optimal time of biodiesel-glycerol separation by using the buoyancy weighing-bar method von Tambun, R, Sibagariang, Y, Manurung, J

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Study on the effect of oil palm shells on fresh water productivity of double slope solar still von Sibagariang, Y.P., Napitupulu, F.H., Kawai, H., Ambarita, H.

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Estimation of the settling time of wastewater using the Buoyancy Weighing Bar Method von Sibagariang, Y., Tambun, R., Hasibuan, R., Alexander, V.

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Investigation of the effect of a solar collector, nozzle, and water cooling on solar still double slope von Sibagariang, Y.P., Napitupulu, F.H., Kawai, H., Ambarita, H.

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Determination of Anoxygenic Photosynthetic Bacteria from Water and Sediment in Dumai Coastal Water, Indonesia von Batubara, U M, Sibagariang, R D, Siregar, S S, Maelina, T, Ginting, T Y, Pratama, MR, Jaboro, M R

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