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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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Sistem integrasi keaman dan kenyaman lift menggunakan TAG-RFID pada berbagai obyek vital Hudzaifah Hazazi Zia Kusuma; Jatmiko Endro Suseno; Priyono Priyono
Youngster Physics Journal Vol 7, No 2 (2018): Youngster Physics Journal April 2018
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This paper discusses the security system of lift devices and rooms that  integrated with one Radio Frequency Identification (RFID) device. The RFID tags are small, wireless devices that help identify objects that  can provide convenience, security and convenience for users  to improve service quality base on on the Arduino Mega 2560 microcontroller. The results of control integrated system design of between elevator doors with private rooms and other facilities can be done well. In this design, the visitor management system becomes the central integrated security system because only visitors who have access can utilize various facilities in accordance with the existing code in RFID, so this result is very potential to be applied for various control vital objects for more secure system security. Keyword: RFID, Security system, Arduino, Microcontrol
PEMBUATAN MATERIAL MAGNETIK KOMPOSIT BaFe9Mn0,75Co0,75Ti1,5O19/ELASTOMER UNTUK APLIKASI PENYERAP GELOMBANG ELEKTROMAGNETIK Windu Ganar Prasongko; Priyono Priyono
Youngster Physics Journal Vol 3, No 1 (2014): Youngster Physics Journal Januari 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The magnetic material of BaFe12 - 2x ( MnCo ) xTixO19 which is considered as a magnetic material of M type Hexaferrite and being substituted partially of two Fe3+ ions with an Mn 2+ ion , Co2+ , and an Ti4+ ion has been researched and tested by using sol gel method. The magnetic material is formed from Ba( NO3 )2 , Fe( NO3 )2 , Mn( NO3 )2 , Co( NO3 )2 , Ti( NO3 )4.BaFe12 - 2x( MnCo )xTixO19 for x = 1.5 synthesized by using sol gel, in the form of powder. From the magnetic test result, it is obtained that the coercivity values is 3.8 kA / m and the magnetization value is 0.29  Tesla. The density test result of pellet barium heksaferrite is 3.453 to 5.060 g / cm3 for 90 μm. The morphology analysis of the sample surface by using Scanning Electron Microscopy( SEM ) showed hetereogenety in particle size. The result of absorption test showed the absorption in the range of 8-12 GHz. The result of mechanical tests showed that the adhesion test had the variation values to different point.Keywords: BaFe12 - 2x( MnCo )xTixO19 for x = 1.5,sol gel              
SISTEM MONITORING KEKERUHAN AIR MENGGUNAKAN JARINGAN WIRELESS SENSOR SYSTEM BERBASIS WEB Khanif Pramusinto; Suryono Suryono
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

Turbidity in the water was not the nature of the water harmful but can cause concern contained impact of chemical compounds that are harmful to living things. Turbidity caused by suspended matter or insoluble. Water that exists today can not be separated from the insoluble particle pollution such as sand, mud, organic and inorganic chemicals that have an impact on organisms in the water. Wireless sensor system with a telemetry system can be a solution of the measurements performed remotely from the turbidity of the water. System monitoring turbidity in this study consisted of a water turbidity sensor that is connected to the microcontroller ATSAM3X8E. The results of the turbidity sensor converted by ADC microcontroller. Data read has been converted into a digital converted into the turbidity value by the microcontroller. Data communication systems that use serial communication between the microcontroller with a personal computer (PC) and data acquisition results displayed on acquisition applications on the PC and then stored into the database. Data acquisition results turbidity has an average division of ± 68 NTU. The data was transmitted from the station Remote Terminal Unit (RTU) to station Terminal Control Unit (CTU) with telemetry technique used a WiFi network that can be accessed through a web browser on a PC CTU and can displayed data in real-time in the form of a table.
IDENTIFIKASI BIDANG GELINCIR DENGAN METODE TAHANAN JENIS KONFIGURASI DIPOLE-DIPOLE DAERAH BAMBANKEREP NGALIYAN SEMARANG Aliyatarrafiah Aliyatarrafiah; Agus Setyawan; Sugeng Widada
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

Shallow exploration of subsurface commonly use resistivity method which the electricity principles in the earth. The aims of this research are identify slip surface and slope safety factor at Pucung Bambankerep Ngaliyan Semarang using dipole-dipole configuration. The results of measurements are voltage and electric current to calculate the apparent resistivity value then processed by RES2DIV software for determine the lithology and the slip surface area. The value of slope safety factor was 1,332 from modelling by Rockscience software. The results present that lithology in the study area consist of clay, sand, sand gravel, and breccia. There is a slip surface at a depth of between 1,20 to 6,10 m.  Keywords: slip surface, Rockscience, resistivity, dipole-dipolee
PENGUKURAN PERUBAHAN SUDUT POLARISASI OLEH FLUORESENSI PADA SAMPEL MINYAK ZAITUN Nyadaniati Simbolon; Ketut Sofjan Firdausi
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

The aim of this research is to show how the quality difference of cooking oil affect polarization angle changes of fluorescence. The fluorescence could be usefull to identify quality of matter according to colour changes. In this research, to identify fluoresence polarization changes edible and expired olive oil used as sample with different expired date. To produce fluorescence, a green laser with wavelength 532 nm pass by polarizer and produce polarized light. Analizer sets perpendicular to polarization plane. The result show that quality difference affect the fluorescence polarization changes. The worst quality of oil the higher polarization changes. Smallest polarization changes we get in the best quality edible olive oil as 50,90 and 61,60 for the expired one.
ANALISIS PERUBAHAN IKLIM BERBAGAI VARIABILITAS CURAH HUJAN DAN EMISI GAS METANA (CH4) DENGAN METODE GRID ANALYSIS AND DISPLAY SYSTEM (GrADS) DI KABUPATEN SEMARANG Ismi Dian Kusumawardhani; Rahmat Gernowo
Youngster Physics Journal Vol 4, No 1 (2015): Youngster Physics Journal Januari 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Global climate change as the implications of global warming caused by greenhouse gas increases from time to time. Methane (CH4) is a greenhouse gas that causes the greenhouse effect and has the effect of 20-30 times greater than carbon dioxide. The rate of CH4 emissions to the atmosphere is the fastest among other greenhouse gases.The research was conducted by analyzing climate change using the data of precipitation, air temperature, and methane emissions. Data of Ungaran - kabupaten Semarang precipitation obtained from Badan Meteorologi, Klimatologi dan Geofisika (BMKG) Climatological Station Semarang. Globally available data of precipitation and air temperature, that is downloaded from the website National Oceanic and Atmospheric Administration (NOAA). While the emission data of methane (CH4) is obtained from Badan Lingkungan Hidup (BLH) Central Java with data that covers an area of Central Java. To determine the existence of climate change in the research area of data analysis is carried precipitation and air temperature during the last 30 years. The method used is the method of Grid Analysis and Display System (GrADS) that can be used for processing and visualizing the earth science data.The results of this study, the increase in precipitation and air temperature every year in a period of 30 years in kabupaten Semarang. The average amount of precipitation every year is obtained by 1579.86 mm. Precipitation in Central Java region shown by the pattern of monsoon rainfall. The average maximum precipitation in January, while the minimum in August. The average air temperature increase annually by 0.014oC or 0.051% every year. Similarly, the amount of methane emissions (CH4) in all parts of human activity in the region of Central Java has increased every year. The average increase of CH4 emission obtained annually by 14.99 Gg or 1.36%. On average generated methane emissions from human activities annually by 1104.54 Gg.Keywords: Global warming, climate change, GrADS, precipitation, methane emissions (CH4)
Karakterisasi reaktor plasma lucutan berpenghalang dielektrik berkonfigurasi elektroda spiral-silinder dengan sumber udara bebas Istiqomah Istiqomah; Muhammad Nur; Fajar Arianto
Youngster Physics Journal Vol 6, No 3 (2017): Youngster Physics Journal Juli 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

A research about  characteristics of the plasma reactor dielectric barrier discharge gas filling the air. Plasma reactor in this research was prepared by component an electrode in the form of copper wire wrapped with a number of turns as much as 72 coil and coil diameter 25,05 mm, pyrex tube with a length of 30 cm, a diameter of 3 cm, and a thickness of 2,45 mm as a dielectric barrier, and the outer electrode in the form of cooper sheet the loaking the pyrex tube. This characterization is done by the air stream into the reactor without sample. Input voltage variation used 0,2-1,4 kV at intervals rise of 0,2 kV and the air flow rate 1-10 L/min with intervals increase of 1 L/min. The results of the characterization of current and voltage is obtained, the greater the measured current with increasing voltage and air flow rate given. The result of the characterization can be used to calculate the value of the charge carrier mobility, and the charge carrier mobility values obtained on the air flow rate 1-8 L/min increased along with the increase in air flow rate. Mobility values in the lowest obtained by air flow rate 2 L/min and the highest air flow rate 8 L/min at 2,59 x 10-5 m2/Vs and 6,08 x 10-5 m2/Vs. In addition, there are also ozone measured from the reactor stuffing free air, and obtained the maximum ozone concentration in the air flow rate of 10 L/min at 191,698 ppm.Keywords: the plasma dielectric barrier discharge, ozone, mobility of the charge carriers
Pengukuran Laju Paparan Radiasi Sinar-X Pada Ruang Operator RSUD. Prof. DR. W. Z. Johannes Kupang Yoel Midel Leitabun; Heri Sutanto; Choirul Anam
Youngster Physics Journal Vol 2, No 2 (2013): Youngster Physics Journal April 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The measurement of X-ray radiation exposure rate in operator’s room with Pb glass at the Prof. Dr. W. Z. Johannes hospital, Kupang has been done. The measurement of radiation exposure rate for radiation before and after passing through the Pb glass was done using surveymeter. There are six points of measurement: at the upper-left, upper-right, upper-midle, bottom-left, bottom-right, and bottom-midle sides. The results of measurements show that Pb glass reduce the radiation exposure rate until 99,51%, and when flouroscopy is activated, the radiation exposure rate at the operator’s room is 0,6 mR/hour. This value is below the value of dose limit (NBD). Keywords: radiation exposure rate, Pb glass, radiaion at the operator’s room
Karakterisasi reaktor plasma berarus positif dengan konfigurasi elektroda titik-bidang dan penerapannya pada kain polyester grey Ukhti Nurohma Rizki; Zaenul Muhlisin; Fajar Arianto
Youngster Physics Journal Vol 7, No 1 (2018): Youngster Physics Journal Januari 2018
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

In this research, the effect of corona discharge plasma radiation on polyester knitting fabrics aimed at obtaining characterization of stress, current and distance relationships, obtaining ion mobility values, obtaining irradiated polyester knit fabric characterization, and obtaining SEM results showing morphological changes fabric. The reactor used is a corona discharge plasma reactor with a configuration of positive point of origin with DC high voltage generator, 15x15 cm in size with the number of 100 point needles. Factors affecting non-sample characterization or with polyester knit fabric sample as irradiation parameters include duration of irradiation, electrode spacing, and applied voltage. Based on the results of unsampled characterization and with samples using 10 variations of distance, from 0.9 cm, 2.1 cm, 2.4 cm, 2.7 cm, 3.0 cm, 3.3 cm and 3.6 cm. The result of unsampled characterization shows the current and the resulting voltage is higher than the sample. This, due to the resistivity of the fabric is lower than air resistivity, so the resulting voltage and current are small. Can be seen at a distance of 0.9 cm without sampling a rise in current of 2.5 mA with a magnitude of 0.535 kV, and there is a sample at a current rise at 2.5 mA resulting only a voltage of 0.236 kV. The resulting ion mobility shows that the greater the electrode distance the ion mobility becomes smaller. The water drop test used 5 variations of distance from 1.2 cm, 1.5 cm, 1.8 cm, 2.1 cm and 2.4 cm with duration of 5-35 minutes with 5-minute increments. Water drop test results also show that the longer the process of irradiation of polyester knitting cloth gray, then the absorption time increases. This is shown in the study where the duration of 5 minutes obtained the absorption time of 6.42 seconds while in the duration of 35 minutes obtained time 2.87 seconds. in SEM test results used 3 fabric where the fabric I as control, fabric II and fabric III experienced plasma irradiation. The control fabric has a finer surface than the plasma-treated cloth. SEM test results note that plasma change morphology on polyester fabric, thus increasing the roughness of fabric surface. Keywords: polyester fabrics, ion mobility, multi-point fields, textile treatment, corona plasma, clashing fabric properties
PENGAMBILAN DATA KWH METER MENGGUNAKAN MIKROKONTROLER ATMEGA8535 DENGAN KOMUNIKASI INFRAMERAH Agus Atabik Anwar; Kusworo Adi
Youngster Physics Journal Vol 3, No 1 (2014): Youngster Physics Journal Januari 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research has been done utilizing the infrared data communication, as data retrieval by officers PLN kwh meter, kwh meter analog works by utilizing a rotating magnetic field aluminum plate, the rotation speed is influenced by the size of the electric current, the data set will be taken manually every month by officers PLN. Analog kwh meters of electricity in this regard has been modified into a digital Kwh meter, with infrared transmitter facility as a data transmission media. In this research will be limited only in the manufacture of data communications equipment, utilizing the media wave infrared wireless transmission of data with a certain distance.            This Equipment will have an LCD and several buttons to facilitate the operation. Data  of  Kwh meter saved in the Equipment can be viewed again on the LCD. With the assistance of proper software, data can further be processed into a computer using comport feature on the Equipment. This Equipmentuses microcontroller ATmega8535 and 9-volt battery power. Keywords: microcontroller, infrared communication, Kwh meter  

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