Wihantoro Wihantoro
Program Studi Fisika, Fakultas Sains dan Teknik, Universitas Jenderal Soedirman

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Prototipe Pemanas Air Tenaga Surya Menggunakan Karbon Sebagai Penampung Kalor Wihantoro, Wihantoro; Yanto, Agus; Sunardi, Sunardi
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
Publisher : BERKALA FISIKA

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Abstract

A solar water heater prototype that fully exploit the nature of black body radiation are made from carbon powder mixed with cement as a thermal energy container material has been created. The phenomenon of physics that underlie the pattern of spread of heat and decrease their physical equations studied in this paper.Construction of heating a metal box containing the installation of planar spiral-shaped copper pipe which is covered with mortar-carbon. The water that fills the copper pipes are supplied by thermal energy from carbon-mortar. Immediately after absorbing heat energy, water density to be different in each section of pipe, causing water circulation by convection between the heater with a water reservoir. The performance of prototype heater is seen from measurements of water temperature rise in the reservoir every 15 minutes. The results are used to determine the average temperature rise of water in every second of it at once to calculate heat energy absorbed by the water in each second. Water temperature in the reservoir increased by 0.0009 ° C per second. At the maximum irradiation conditions, the rate of heat per second that are transferred from a mixture of carbon into the water-cement amounted to 0.075 kW.   Keywords: heat energy, water circulation by convection, heat rate per second
PROTOTYPE GENERATOR MAGNET PERMANEN MENGGUNAKAN KUMPARAN STATOR GANDA Hartono, Hartono; Sugito, Sugito; Wihantoro, Wihantoro
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 4 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

A permanent magnet generator has had been built using double stator coil.  Such coil was used to increase the electrical energy produced. This is apparently a type of single phase generator equipped by four permanent magnets of 2.5 cm in diameter and length each. Each of the four magnets has 4000 Gauss magnetic strength. The coil itself made from email wire of 0.12 mm in diameter and has 1200 turns. The performance of generator was tested on a rotor that turn by 300, 600, 900 and 1200 rpms each. The testing was performed on a condition with and without any load resistance. Testing result without load resistance showed the increase average output voltage about 83.95%, where the generator with load resistance has increase average output voltage about 62.65%.Keywords: generator, permanent magnet, double stator, increase the electrical energy
Investigasi Bidang Gelincir Tanah Longsor Dengan Metode Tahanan Jenis Dan Pengujian Sifat Plastisitas Tanah Di Bukit Pawinihan Desa Sijeruk, Kecamatan Banjarmangu, Kabupaten Banjarnegara Irayani, Zaroh; Permanajati, Indra; Haryadi, Aris; Wihantoro, Wihantoro; Azis, Abdullah Nur
Dinamika Rekayasa Vol 12, No 2 (2016): Dinamika Rekayasa - Agustus 2016
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2016.12.2.145

Abstract

Investigasi bidang gelincir zona rawan longsor di sekitr lokasi mahkota longsor Bukit Pawinihan Sijeruk Banjarnegara telah dilakukan dengan menggunakan metode geolistrik tahanan jenis metode Wenner. Uji sifat plastisitas tanah penyusun di lokasi penelitian dilakukan pada tingkat pelapukan yang berbeda. Tujuannya untuk menentukan kedalaman, jenis pelapukan dan sifat dari bidang gelincir. Hasil pemodelan resistivitas 2D menunjukkan bahwa bidang gelincir berada pada kedalaman 6-8 meter berupa batu breksi lapuk (30-118 Ωm). Batuan ini merupakan batuan dengan tingkat pelapukan 3 dan bersifat kohesif. Nilai indeks plastisitasnya adalah 8,27.