Jatmiko Endro Suseno
Departemen Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang

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Identifikasi Unsur-Unsur Berdasarkan Spektrum Emisi Menggunakan Jaringan Syaraf Tiruan

JURNAL SAINS DAN MATEMATIKA Volume 15 Issue 1 Year 2007
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

 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

PEMINDAIAN DAN PENGOLAHAN LABEL KEAMANAN PADA DOKUMEN RAHASIA DENGAN TITIK KUANTUM

YOUNGSTER PHYSICS JOURNAL Vol 4, No 4 (2015): Youngster Physics Journal Oktober 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Security label is made to anticipate the increasing of documents falsification trend. In this study, the security label is created using CdSe quantum dots. The quantum dots can be used for casting light according to its wavelength so that the particle size can be specific. That’s why its worth to be security key from quantum dots. The quantum dots that be used is colloidal CdSe quantum dots with a wavelength of 595 nm and 526 nm. In the previous studies have been done the two-dimensional scanning process of quantum dots for one color as a security label. However, the results obtained are not perfect because it has not done the repair process for the image resulted. Therefore, in this study conducted by the two-dimensional scanning of quantum dots in two colors to add a level of security on the label then followed by image processing in order to obtain a better image. Image processing which have been done by observing the histogram of the image in order to obtain a threshold value between the object and the background image. Scanning generate data in the form of a sequence intensity value corresponding to the color intensity of quantum dots to obtain image data processing results. Image processing through the observation of the histogram data successfully get the intensity threshold value so that the image can be processed to become more visible in accordance with the sample

Solving a system of linear equations by QR Factorization Method for Temperature and Altitude Regression Model against Spontaneous-Potential

JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 3 Year 2014
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Many real problems can be represented in the form of multiple linear regression equation. One of those is the relationship between the variables of temperature and altitude of the spontaneous-potential. In order to determine the parameters of the regression equation, the least squares method was used. From here, there was obtained the system of linear equations. In this paper, to solve systems of linear equations, the exact method was used as the exact solution is certainly better than the approached solution. The method used was the QR factorization method. At the QR factorization, the system of linear equations was written in form of matrix equation. Then, the coefficient matrix which the number of rows is m and number of columns is n with linearly independent columns was factored into the matrix Q which has the same size with the matrix A, with orthonormal columns and matrix R was upper triangular. Furthermore, by backward substitution, it could be obtained the exact solution of linear equation system. As verification of this proposed method, a case study was given using data of temperature, altitude, and spontaneous-potential in the geothermal manifestations area, Gedongsongo, Mount Ungaran Semarang. From here, it was obtained the parameters of exact multiple linear regression model which states the relationship between temperature and altitude toward the spontaneous-potential.

STUDI RECTENNA (RECTIFIER ANTENNA) UNTUK MENGUBAH GELOMBANG ELEKTROMAGNETIK RF MENJADI SUMBER TEGANGAN DC

YOUNGSTER PHYSICS JOURNAL Vol 5, No 1 (2016): Youngster Physics Journal Januari 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

RF (Radio Frequency) electromagnetic waves energy source  are still very rare utilization besides using the RF signal is very much especially in the areas of technology and telecommunications, resulting in the number of RF electromagnetic energy in the air, if the energy source of the RF electromagnetic wave can be utilized as a DC voltage source will be promising alternative energy sources and environmentally friendly. Simulations conducted to determine the ability of the rectifier circuit, then design a rectifier that can work on GSM frequencies and antennas used Quad Band 850/900/1800/1900 antenna ANT-GXH915. Tests conducted two places, namely the testing performance of rectifier and environmental testing. Results of testing performance of rectifier using the Signal Generator at a frequency range of 50 MHz - 900 MHz rated voltage of 1,56 volts and a current of 35 uA with an efficiency of 13,95%. The results of environmental testing conducted by two sources that the source of the cellular telephone and the BTS source. Results from the source mobile phone when making calls obtained voltage value of 1,54 Volt and a current of 0,25 mA at a distance of 1 cm. Results from the source BTS to a distance of 37 meters obtained voltage value of 0,405 Volt.Keywords: rectenna, antena, rectifier, energy harvesting.

PEMBUATAN GENERATOR MIKRO WINDBELT DENGAN OPTIMASI PARAMETER PITA DAWAI DAN MAGNET

YOUNGSTER PHYSICS JOURNAL Vol 5, No 3 (2016): Youngster Physics Journal Juli 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

ABSTRACTWind energy has the potential to be utilized as a power plant. One of the utilization of wind energy into electrical energy by making Windbelt generator. Then do research to find the value of the voltage on the generator Windbelt optimization by varying the parameters of the ribbon and the magnet, the magnetic variation on this Windbelt generator includes a magnet and a thick diameter magnet, variations among others 10,12,15,18,20 mm diameter while the thickness variation between another 1.5 and 2 mm. Then for the ribbon parameters include length of ribbon and tape width, variations in use for a long ribbon among others 60,80,100 cm whereas the variation for bandwidth among others 15,18,20,25,30 mm. In order to obtain the optimal voltage value then the coils and wind speeds need to be noticed and measured, variations 1000,1500,2000 winding coils used for measuring wind speed at 1,2,3,4 m / s. Having done research found value best optimization of parameter variations - variations of which have been taken to optimsi voltage on the generator Windbelt with a diameter of 18 mm, thick magnet 2 mm, band width 20 mm, length of ribbon 60 cm, the number of windings in 2000, the wind speed of 4 m / s. Generate a voltage value stream optimization for 5 Volt, 146 mA and Power 0.73 mWatt large voltage generated Windbelt generator capable of powering the LED.Keywords: Windbelt, voltage optimization, neodymium magnet, ribbon

SISTEM MONITORING JARAK JAUH RADIASI GAMMA SECARA REALTIME BERBASIS WEB SERVER

YOUNGSTER PHYSICS JOURNAL Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Instruments gamma radiation monitoring system was successfully developed. The instrument can measure the value of radiation exposure in an environment or material. The system was designed using sensor instrumentation Geiger tube M4011 and NGMC Module V1 using a web data base server. Sensor Geiger tube M4011 used had detection capabilities between 0mR / h ~ 120mR / h γRay. Data v alues gamma radiation that has been detected by the sensor is processed by the Geiger tube M4011 Microcontroller Atmega 328. Microcontroller 328 then sends the data that has been read into the webbased database serverusing Internet network GSM. In this system use web interface that allows users to monitor gamma value, without requiring a special receiving station. Basedon the results of validation of the value of gammaray radiation from the Geiger Counter, by means of Geiger Muller standard, Geiger counters and Geiger Muller has value misprint in a row in the lab ecology (4:06 ± 0:21) and (4:08 ± 0.20), at a distance of 4 cm material cesium 137 (9:20 ± 0.20) and (10.2 ± 0:28), and the material cobalt 60 (22:36 ± 0.40) and (22:04 ± 0.36), at a distance of 8 cm material cesium 137 (5.94 ± 0.20) and (5.78 ± 0.21), and materials cobalt 60 (15.96 ± 0.40) and (16:04 ± 12:23), at a distance of 12 cm material cesium 137 (4.76 ± 0:13) and (4:52 ± 0:16), and the material cobalt 60 (11.72 ± 0.21) and (12:46 ± 12:22).  

Sistem Monitoring Kendaraan Secara 3D dengan Sensor Tekanan Udara dan Global Positioning System (GPS) Berbasis Web Secara Realtime

YOUNGSTER PHYSICS JOURNAL Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

A research on telemetry or remote measurement has been conduced, for the parameters of the position of a moving object, ie the vehicle. Parameters such as latitude and longitude position is obtained from the GPS receiver (Global Positioning System). GPS receiver is used Ublox Noe 6 M. In addition it’s also added a altitude parameter, which is obtained by converting the changes of air pressure. Sensor BMP180 used to measure air pressure. Both of these devices are read and controlled by a microcontroller ATmega328 with the Arduino software. The GPS receiver to get latitude and longitude coordinates from the satellite. Coodinates data is sent to a microcontroller, combined with altitide data, then data sent to the database server using internet with GSM network. In this system used web interface that allows users to monitor the position of the vehicle, without necessary for special receiving station. Based on the results of validation latitude and longitude coordinates from the GPS receiver, with GARMIN GPS devices with the GPSMAP 78s series, this GPS receiver has the highest standart deviation ± 0.000006 degrees for the longitude and ± 0.000012 for latitude. The position of the vehicle in form of latitude and longitude coordinates, then illustrated on Google Maps. The results of this study, acqusition system that has been mounted on the vehicle position coordinates can transmit data to the server, and the data transmission process becomes faster and cheaper. This system will continue sends the data for vehicles that are in the area covered by the GSM network provider. Lack of this system is data transmission medium that is highly dependent on the availability of the GSM network. If the GSM network is weak, it can cause failures in data transmission.