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All Journal BERKALA FISIKA SAINS DAN MATEMATIKA YOUNGSTER PHYSICS JOURNAL Jurnal Pendidikan Fisika Indonesia Journal of Physics and Its Applications
Muchammad Azam, Muchammad
Departemen Fisika, Fakultas Sains Dan Matematika, Universitas Diponegoro, Semarang
Astronomy Earth & Planetary Sciences Education Materials Science & Nanotechnology Mathematics Physics

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Journal : SAINS DAN MATEMATIKA

 1 
PENGARUH INDUKSI MEDAN RADIO FREQENCY (RF) PADA DIPOL-DIPOL MOLEKUL AIR Firdausi, Ketut Sofjan; Kamil, Ahmad; Azam, Muchammad
JURNAL SAINS DAN MATEMATIKA Volume 17 Issue 1 Year 2009
Publisher : JURNAL SAINS DAN MATEMATIKA

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ABSTRACT-The non-linear optical property of rotary power of light polarization in water has been develop using the Radio-Freguency field (RF-Field). The RF-Field used in the experiment is produced by RF generator, and it supplies the frequency in the range betwen 6,04 to 14,56 MHz which then applies to the samples. The source of light with 632,8 nm-wavelength and 532 nm-wavelength are used to observe the change of range polarization of the light after it passes througt the samples.  Three modes of the direction of the electric field of light are chosen 0o (E//) (E of light is parallel to E of RF-Field), and 90o (E ) (E of light is perpendicular to E of the RF-Field) in order to determinate the optimal change of the angle of the polarization β. The values of β is measured as a function of RF-Field,  , where ωRF is the angular frequency of RF-Field and  BRF is the magnitude of magnetic field measured in the center of the coil which is assumed to be homogeny in the circumstances of the samples. The results of the experiment show that the degrees of change of the polarization direction, η is largest at the E3 mode. It shows also that at small wavelength of light we obtain the larger η, which is indicated the higher frequency of liglt will more induce the dipoles of molecules of the samples. Keywords:  non- linear optics, polarization angle, rotary power
Penentuan Efisiensi Beta Terhadap Gamma Pada Detektor Geiger Muller Azam, Muchammad
JURNAL SAINS DAN MATEMATIKA Volume 15 Issue 2 Year 2007
Publisher : JURNAL SAINS DAN MATEMATIKA

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ABSTRAK---Telah dilakukan penentuan nilai effisiensi pencacah beta terhadap gamma pada tiga jenis detektor Geiger Muller yang memiliki jari-jari yang berbeda. Pencacahan dilakukan dengan menggunakan Cobalt-60 sebagai sumber radiasi dan aluminium foil sebagai absorber. Hasil penelitian menunjukkan bahwa efisiensi pencacah beta terhadap gamma untuk ketiga jenis detektor berbeda, detektor jenis 3 memiliki efisiensi paling besar. Adapun nilai efisiensi pencacah beta terhadap gamma untuk ketiga jenis detektor sebagai berikut: untuk detektor 1 adalah 0,40 %, detektor 2 adalah 3,31 %, dan detektor 3 adalah 0,53 %.   Kata kunci : Sumber radiasi Cobalt-60, Detektor Geiger Muller, Aluminium foil, effisiensi pencacah beta terhadap gamma.
Identifikasi Unsur-Unsur Berdasarkan Spektrum Emisi Menggunakan Jaringan Syaraf Tiruan Prasetyo, Eko; Azam, Muchammad; Suseno, Jatmiko Endro
JURNAL SAINS DAN MATEMATIKA Volume 15 Issue 1 Year 2007
Publisher : JURNAL SAINS DAN MATEMATIKA

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 ABSTRACT---Neural network program for elements identification based on its emission spectrum has been made using backpropagation method. The programming language which was used is MATLAB 7.0. This neural network has a single hidden layer. Training and testing data are emission spectrum data which are emission wavelength from each element. Training process was done by introducing known emission spectrum data to neural network program. Neural network program has been successful to identify elements based on its emission spectrum. Training process will be faster if we adjust the number of hidden layer’s neuron as 100, the value of learning rate as 0,049 and the value of momentum as 0,98. The neural network accuracy of identifying elements is determined by the value of error target. Error target. The value of target error about 10-2 has accuracy 97,14% and the value of target error about 10-4 has accuracy 100%. Keywords: Neural network, backpropagation method, and emission spectrum
Co-Authors A. Bawono Ahmad Kamil Anak Agung Istri Sri Wiadnyani ARIFAH ARIFAH Catur Edi Widodo Dhahryan Dhahryan Eko Hidayanto Evi Setiawati Fidayati Nurlaili H.P. Kusumaningrum Heri Sugito I. Afiefah Izzah Afiefah Jatmiko Endro Suseno K. Sofjan Firdausi K. Sofjan Firduasi Ketut Sofjan Firdausi, Ketut Sofjan Muhammad Nur Pandji Triadyaksa Qidir Maulana Ririn Widya Septianti Salimatul Litasova Setiyono Setiyono SRI RAHAYU Very Richardina W. S. Budi Wahyu Adi Wibowo Widarto Widarto