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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.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (228.019 KB)

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (482.11 KB)

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
SINTESIS DAN KARAKTERISASI MEMBRAN KITOSAN/LIOH SEBAGAI ELEKTROLIT PADAT BATERAI SEKUNDER Sunardi, Sunardi; Haryadi, Aris; Wihantoro, Wihantoro; Yulianti, Evi
Jurnal Teras Fisika Vol 2 No 1 (2019): Jurnal Teras Fisika
Publisher : Jurusan Fisika, Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (361.229 KB) | DOI: 10.20884/1.jtf.2019.2.1.1334

Abstract

The synthesis and characterization of chitosan/LiOH membranes was carried out aimed to determine the effect of  chitosan/LiOH on the electrolyte membrane microstructure of secondary batteries. Synthesis of chitosan/LiOH membranes was carried out by casting method with concentration variations w/w LiOH. The characterization was carried out using FTIR (Fourier Transform Infra Red) and SEM (Scanning Electron Microscopy). The results FTIR of chitosan/LiOH membrane showed an interaction between chitosan/LiOH. At a wavelength of 3500 nm a new -OH functional group is formed and at 1500-945 nm a bending bond is formed between the -OH group and ?NH3. The SEM results show that agglomeration is formed by increasing the concentration of LiOH in the solution. A distribution of homogeneous particles occurs on the surface of the membrane. This shows that there is the effect of adding LiOH to the formation of membranes which results in increasingly tenuous / unstable atomic bonds and increasingly conductive materials. Keywords : Functional group, grain size, chitosan, LiOH, electrolyte
POLA KURVA ISODOSIS DARI PENYINARAN BERKAS PROFIL DATAR PADA KANKER PAYUDARA DENGAN TEKNIK TANGENSIAL MENGGUNAKAN MCNPX Maftuhatun, Aat; Haryadi, Aris; Wihantoro, Wihantoro
Jurnal Teras Fisika Vol 2 No 2 (2019): Jurnal Teras Fisika
Publisher : Jurusan Fisika, Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (580.478 KB) | DOI: 10.20884/1.jtf.2019.2.2.2156

Abstract

Makalah ini mengkaji pola kurva isodosis dari teknik tangensial radioterapi pada kasus sel kanker payudara dini yang berada di dalam payudara kiri.  Dari kondisi ini, sudut penyinaran yang diambil adalah tangensial kanan dengan sudut 120o dan 300o. Berkas sinar gamma yang ditembakkan berada pada energi 1,17 dan 1,33 MeV sebagai berkas profil datar dengan ukuran SSD 80 cm dan luas medan radiasi (10 x 10) cm2. Dosis serap pada tiap titik di dalam organ dada ditentukan berdasar riwayat hidup perjalanan sinar gamma dengan metode Monte Carlo menggunakan program MCNPX. Gabungan pola isodosis dari kedua sudut penyinaran menggambarkan distribusi dosis maksimum dan minimum di tiap tiap titik organ rongga dada.  Dosis maksimum terjadi pada sel kanker dan bagian atas payudara kiri.  Dari sini, dapat dikatakan penyinaran tangensial dengan sumber profil datar tidak disarankan untuk tindakan terapi kanker payudara stadium dini.  
NUMERICAL ANALYSIS OF ENERGY CONVERTER FOR WAVE ENERGY POWER GENERATION-PENDULUM SYSTEM Aminuddin, Jamrud; Effendi, Mukhtar; Nurhayati, Nurhayati; Widiyani, Agustina; Razi, Pakhrur; Wihantoro, Wihantoro; Aziz, Abdullah Nur; Abdullatif, R Farzand; Sunardi, Sunardi; Bilalodin, Bilalodin; Arifin, A
International Journal of Renewable Energy Development Vol 9, No 2 (2020): July 2020
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.9.2.255-261

Abstract

The wave energy power generation-pendulum system (WEPG-PS) is a four-wheeled instrument designed to convert wave power into electric energy. The first wheel is connected to the pendulum by a double freewheel, the second and third are ordinary wheels, while the fourth is a converter component that is axially connected to the electric generator. This design used the Euler-Lagrange formalism and Runge-Kutta method to examine an ideal dimension and determine the numerical solution of the equation of motion related to the rotation speed of the wheels. The result showed that the WEPG-PS' converter system rotated properly when its mass, length, and moment of inertia are 10 kg, 2.0 m, and 0.25 kgm2, respectively. This is in addition to when the radius of the first, second, third, and fourth wheels are 0.5, 0.4, 0.2, and 0.01 m, with inertia values of 0.005, 0.004, 0.003, and 0.1 kgm2. The converter system has the ability to rotate the fourth wheel, which acts as the handle of an electric generator at an angular frequency of approximately 500 - 600 rad/s. The converter system is optimally rotated when driven by a minimum force of 5 N and maximum friction of 0.05. Therefore, the system is used to generate electricity at an amplitude of 0.3 - 0.61 m, 220 V with 50 Hz. Besides, the lower rotation speed and frequency of the energy converter of the WEPG-PS (300 rad/s) and induction generator (50 Hz) were able to generate electric power of 7.5 kW. ©2020. CBIORE-IJRED. All rights reserved