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INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
Arjuna Subject : -
Articles 282 Documents
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RANCANG BANGUN SISTEM TELEMETRI MULTI-CHANNEL UNTUK MONITORING SUHU DAN pH AIR MENGGUNAKAN JARINGAN WIFI Ave Gierdo Alfaseno; Suryono Suryono
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

Water quality monitoring is very important to know condition of the water in a sector location. The water quality monitoring can anticipate a decrease of water quality by knowing water condition in real-time, in that way can be determined what factors that causes a decrease of water quality. The method used for water quality monitoring system in this paper is telemetry system (remote measurement) with the wifi network. Telemetry system choosed because its more efisien than the other, measurement can be remotely and in real-time. The test of water quality is bad or good can be known from the elements of test parameters. Parameters sample tested of this research are temperature and pH of the water. To respon physical symptom of changes in amount of water temperature used temperature sensor RTD (resistance temperature detector), and a pH sensor to respon condition of pH of the water. Both of the sensor's reading are converted from analog to digital (ADC) using microcontroller ATmega8535. Microcontroller ATmega8535 has USART feature (Universal Synchronous and Asynchronous Serial Receiver and Transmitter) as a serial communication mode. Serial communication technique in a multi-channel is done by using the RS-485 protocol as a communication link beetwen one unit to another until can connect 32 and using the RS-232 protocol to connect serial communication data to personal computer (PC). The data that has been obtained is sent to the monitoring station by a telemetry technique using the wifi network. Results of the data acquisition system RTD temperature sensor against a standard thermometer has a linear correlation coefficient R = 0.998. And the results of the data acquisition pH sensor against a standard pH meter has a linear correlation coefficient of R = 0.994. Results of the comparison between the data sent and received data has errors = 0 so that it can be ascertained no data is lost or gained.
Penentuan sudut arah angin ion pada lucutan korona positif berkonfigurasi elektroda titik-bidang Sumariyah Sumariyah; Maryam Restiwijaya; Muhammad Nur
Youngster Physics Journal Vol 6, No 4 (2017): Youngster Physics Journal Oktober 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Determination of the ion wind angle of positive corona discharge with point to plane electrode geometry configuration has been done. Point electrode was made from stainless steel with various radiuses of 0.26 mm, 0.28 mm, 0.35 mm, and 0.47 mm. The plane electrode with circle form was made from stainless steel with diameter of 20 cm. Determination of the ion wind angle was carried out by measuring the current, the radius of deformation of lubricating oil at various voltage, electrode spacing, and the radius of the point electrode. The results showed that the angle of the ion wind direction is affected by a given voltage, the distance between electrodes, and the radius of the point electrode. Value of the ion wind flow direction angle is inversely proportional to the distance between the electrode and the radius of the point electrode. When the voltage is increased, the angle of ion wind direction will be larger but would reach saturation at the region of corona discharge which is close to the arc discharge.Keywords: Ion wind, positive corona discharges, point to plane electrode.
ANALISA PERSEBARAN LITOLOGI SANDSTONE PADA FORMASI TALANG AKAR MENGGUNAKAN INVERSI EXTENDED ELASTIC IMPEDANCE (EEI) DI LAPANGAN CILAMAYA, CEKUNGAN JAWA BARAT UTARA Ophi Thio Rendy; Agus Setyawan; Muhammad Mualimin
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Extended Elastic Impedance (EEI) inversion method has been used to analyze sandstone lithology distribution of Talang Akar Formation in Cilamaya Field, North West Java Basin. The target zone was Z2230 layer which located in Talang Akar Formation with litologies of sandstone and shale. Sensitivity analysis showed that gamma-ray and density are sensitive to discriminate the type of lithologies in Z2230 target layer. EEI(58) could simulate gamma-ray and EEI(12) could simulate density with respectively 0,397 and 0,613 correlation values. EEI(12) inversion result showed sandstone lithology distribution in Z2230 layer with 8800 to 9800 . Sandstone lithology distribution concentrated in northwest–southeast of study area. There was hydrocarbon prospect area in north of well OTR-10.Keywords : Extended Elastic Impedance (EEI), gamma-ray, density, sandstone 
RANCANG BANGUN SISTEM TELEMETRI UNTUK MONITORING GAS LPG DENGAN MENGGUNAKAN JARINGAN Wi – Fi Satryo Adi Wibowo; Suryono Suryono
Youngster Physics Journal Vol 5, No 2 (2016): Youngster Physics Journal April 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This research is abaout the telemetry system for monitoring LPG gas concentration using a Wi-Fi network. This research is driven by a need to carry out monitoring of a distant object whose data can be received in real-time and continuously transmitted by the transmitter of the sensor used. The telemetry system is built with ATMega 8535 microcontroller to read analog data from the sensor and converted to digital data. For LPG gas concentration measurement using LPG gas sensor MQ-5, utilizing the RS-232 protocol as serial data communication and Wi-Fi networks as an intermediary for the transmission of information. Use Wi-Fi network for data transmission is an option that is appropriate, given the use of Wi-Fi increasingly popular among the people. LPG gas sensor has an analog output and therefore takes the ADC to convert analog data into digital data that can be read in mikrokontroler The data that has been read by the microcontroller sent using RS232 protocol, then the serial data is stored into the database in a microprocessor. The interface created with php and html language to display data LPG gas concentration from the microprocessor at the point of monitoring. Web browser used on the PC server by entering the IP address adrress of microprocessor that stores the database. Wi-Fi networks are used as transfer media databases of the microprocessor in the PC server to the monitoring point at the observation point. Results of the comparison between the data transmitted and received data has error = 0 so certainly no data is lost or gained. Keywords: LPG gas, telemetry, sensor, serial communications, database.
PENGARUH PENINGKATAN pH CAIRAN DEVELOPER DENGAN PENAMBAHAN ANTARA NaOH DAN Na2CO3 TERHADAP DENSITAS CITRA Edwin Zusagka; Heri Sutanto; Zaenal Arifin
Youngster Physics Journal Vol 3, No 3 (2014): Youngster Physics Journal Juli 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Image density is the level of film image blackness. Keywords : developer, density, pH (acidity), NaOH, Na2CO3. In this study aims to determine the pH value of the liquid developer and image density with the addition of NaOH and Na2CO3 as well as a result of the use of the developer fluid. This research is done by washing the film on the object stepwedge used the same exposure factors namely 60 kV tube voltage, time and tube current of 8 mAs. After that film development using weak developer liquid was done. To increase developer liquid’s acidity, two part of processing using 5 grams addition of NaOH  and Na2CO3 on each part were done. On the first film the process was carried out by adding 5 grams of NaOH and Na2CO3 to each film on the first part of liquid. The same procedure applied using the Na2CO3. The film image density then measured by densoitometer. Result of research shows that adding NaOH and Na2CO3 to developer liquid can increase the acidity and density of film images. Adding NaOH resulted in the highest acidity level of 12,01 with the highest density level of 0,94, while adding Na2CO3 resulted in the highest acidity level of 10,49 with the highest density level of 0,93. Keywords: developer, density, pH (acidity), NaOH, Na2CO3
SISTEM MONITORING JARAK JAUH RADIASI GAMMA SECARA REALTIME BERBASIS WEB SERVER Habib Sabil Rosyidi; Jatmiko Endro Suseno; Zaenal Arifin
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).  
ANALISA CTDI PADA PERMUKAAN DAN PUSAT PHANTOM MENGGUNAKAN CT DOSE PROFILER Cory Amelia; Evi Setiawati; Zaenal Arifin
Youngster Physics Journal Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The research has been done on the comparative value of CTDI on the surface and the center of the phantom. This research was conducted to determine the value of CTDI on the top surface, center, and bottom of the phantom using the CT Dose Profiler on CT scan head and determine the effect of tube voltage on the value of CTDI. The research was conducted with take a CTDI data using the CT Dose Profiler on spiral CT scan mode and using a phantom head. Measurements a CTDI conducted on the top surface, center and bottom surface of the phantom with the variation of the tube voltage value is 80 kV, 100 kV, and 120 kV, and current value 320 mA, time 18.5 s, pitch 0,531, slice thickness 5 mm, and scan length 180 mm. The results of measurements the value of CTDI with variation a tube voltage on the top surface of the phantom was 22.75 mGy to 62.97 mGy, the center of phantom was 19.34 mGy to 59.66 mGy and the bottom surface of the phantom was 20.10 mGy to 54, 19 mGy.  Keywords: Head Phantom, the CT Dose Profiler, CTDI, Tube Voltage.
Penentuan karakteristik cacahan pada counter dengan menggunakan sumber standar 152Eu, 60Co dan 137Cs Hendrika Liana Sari; Wahyu Setia Budi
Youngster Physics Journal Vol 6, No 2 (2017): Youngster Physics Journal April 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The determination count of caracteristics on a counter using the standard source 152Eu, 60Co and 137Cs. The calibration in Counter A due measurement activity source of  Europium-152 (152Eu), Cobalt-60 (60Co) and Cesium-137 (137Cs), because Cesium has one peak of energy. From the calculation on obtained efficiency the average of a sistem when using counter DIN711 is 0,0237±0,0028 and efficiency the average for each Counter A is 0,0243±0,0029. Of the value of activity between the two source measurable by both counter can be seen that counter DIN711 having results activity that were more accessible activity on certificates. To deviation of 19,71 % in counter DIN711 and 19,92 % in counter a.But counter a has deviation of 0.45 % of the measurement result of counter DIN711.Keywords: Spektrometer Nuklir, Counter, Calibration Spektrometer, Uji Banding, Calibration Linierityes, Stabilitas Test
DEPOSISI LAPISAN TIPIS ZINC OXIDE (ZnO) DI ATAS SUBSTRAT KACA DENGAN METODE SOL-GEL UNTUK APLIKASI DEGRADASI WARNA Marediyanti Pusvitasari; Heri Sutanto
Youngster Physics Journal Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

ABSTRACT Zinc oxide (ZnO) thin films have been successfully deposited on glass substrates by spray coating method with a variety of the coating of volume about 10 ml to 50 ml. Then ZnO thin films used to degrade 10 ppm methylene blue dyes with sunlight as a medium. ZnO solution was synthesed by dissolving zinc acetate dehydrate (Zn (COOCH3) 2.2H2O into a solvent of isopropanol ((CH 3) 2CHOH) and monoethanolamine (MEA: HOCH2CH2NH2) at room temperature with a concentration of 0.3 M of zinc acetate and the molar ratio of MEA and ZnAc is 1:1. Then the solution was stirred by a magnetic stirrer at a temperature of 70 ° C for 30 minutes to obtain a clear and homogeneous solvent. Furthermore, gel of ZnO is placed on a spray hole and sprayed on a glass substrate that has been heated to a temperature of 250oC. This ZnO thin films then sintering at a temperature of 400oC for 1 hour. The ability of photocatalyst of ZnO for degradation of methylene blue color was observed through the elektrooptis measurement using polarisator and absorbance test using UV-Vis to obtain the percentage of color degradation. The test results of EDX showed that the ZnO thin film having an atomic composition of 50.27% Zn and 49.73% O. And the test results of elektrooptis showed that a thin film with volume coating of 50 ml, is the highest transmission intensity. This suggests that free radicals that more contained in the solvent. A high percentage of color degradation also obtained by stirring the solvent. Keywords: ZnO thin film, spray coating, Sol gel, color degradation
PENENTUAN AKTIVITAS 60CO DAN 137CS PADA SAMPEL UNKNOWN DENGAN MENGGUNAKAN DETEKTOR HPGe Miftahul Aziz; Eko Hidayanto; Diah Dwiana Lestari
Youngster Physics Journal Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The measurement of radioactivity 60Co and 137Cs in the unknown sample were conducted to determine activity value using HPGe detector. Calibration of energy, calibration efficiency, making the efficiency of the curve calibration, and validation methods are the determination of sample source activity. Calibration of energy and efficiency using standard sources QCRB 1186 and 152Eu. Enumeration carried out using two detectors with efficiencies of 25% and 35%, respectively at a distance of 17 cm and 24 cm. Efficiency curve created using the excel program. Determination of activity is carried out by chopping Co and Cs in the unknown sample at the same position as the standard source for 3600 seconds. Method validation is done by calculating the activity of standard source QCRB 1186 and 152Eu. Method validation using standard source 152Eu at a distance of 17 cm provide a bias of 1,4% - 3,6% and at a distance of 24 cm provide a bias of 0,3% - 4,6%. Determination of activity the unknown sample against reference value at a distance of 17 cm (Co 1173 keV: 16125 Bq and 16716 Bq; Co 1332 keV: 16526 Bq and 16287 Bq; Cs 662 keV: 16526 Bq and 16287 Bq) and at distance of 24 cm (Co 1173 keV: 15289 Bq and 16533 Bq; Co 1332 keV: 15477 Bq and 16481 Bq; Cs 662 keV: 37226 Bq and 38540 Bq). Keywords: Activity, 60Co, 137Cs, Calibration efficiency, Method Validation

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