cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota semarang,
Jawa tengah
INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
Arjuna Subject : -
Articles 282 Documents
 17   18   19   20   21 
PEMODELAN INVERSI ANOMALI MAGNETIK 3D DAERAH MATA AIR PANAS DIWAK DAN DEREKAN Siti Zulaikhah; Udi Harmoko; Tony Yulianto; Gatot Yulianto; Sugeng Widada; Yusuf Dewantoro
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1382.831 KB)

Abstract

Research of magnetic methods that aim to interpretation the subsurface structure around the hot springs area Diwak and Derekan and to identification caused of hot springs Diwak and Derekan has been successfully carried out. In this research, measurements were taken at 97 points using a proton precession magnetometer (PPM) type of GSM model 19T geometrics and two Geotron Magnetometer G5 models to get the value of the total magnetic field. Measurement data is processed by the daily variation correction and correction IGRF (International Geomagnetic Reference Field) to get the value of the total magnetic field anomaly. Corrected data used to create contours of the total magnetic field anomaly. Contour total magnetic field anomaly is used for the reduction to plan surface process and upward continuation process. The results of the upward continuation get the contours of local anomaly and regional anomaly, the results of the local anomaly contour then reduced to the pole. Results of the research is a pair of positive and negative closure indicate a fault structure below the surface. There are two pairs of positive and negative closure which an incision is made to determine the subsurface structure by creating a 2D model using the software Mag2dc. 2D modeling results indicate the existence of a second incision fault structure in the form of down trending fault southwest-northeast. Meanwhile, to make 3D models using software Mag3D and 3D modeling results indicate the presence of fault structures below the surface. Fault zone results of 2D and 3D modeling is a media outlet fluid to the surface in the form of hot springs Diwak and Derekan.
KAJIAN TAMPANG LINTANG HAMBURAN ELEKTRON DENGAN ION MELALUI TEORI HAMBURAN BERGANDA (MULTIPLE SCATTERING THEORY) Nouval Khamdani; Muhammad Nur; Zaenul Muhlisin
Youngster Physics Journal Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (282.576 KB)

Abstract

Theoretical studies have been conducted on the Cross-sectional scattering equation which is one of the effects from collisions between electrons with ion. This theoretical studies aim to obtain the differential cross-section scattering equations of electrons with ion. Born approximations were used and convert potential energy into potential energy which is obtained from the distribution of ions in the Debye sphere, so the new equation for the scattering of amplitude that can write  will comparable with total sum of ions and also the scattering of cross section is   will too comparable with the large of Debye sphere. Keywords: scattering of amplitude, scattering of cross section, Born approximation, potential energy, Debye sphere, total sum of ions
Perhitungan VEV dari operator Wilson Loop Unknot dari teori Chern-Simons-Witten (CSW) 2+1 dimensi dengan menggunakan teori Braiding dan teori medan kuantum Asep Yoyo Wardaya
Youngster Physics Journal Vol 6, No 2 (2017): Youngster Physics Journal April 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (263.036 KB)

Abstract

Concepts of Mathematical (Group theory) and Physics (Quantum Field Theory) sciences have a relationship in many Scientific applications. One example of this relationship is topology field theory such as Jones and HOMFLY polinomials in two space and one time dimensions, which have a connection with the concept of the quantum field theory. In this paper, we investigated  the value of the invarians polynomial at SO(5) group by using braiding group concept that has exact solution. As comparison, Quantum Field Theory concept will be calculated the Vacuum Expectation Value (VEV) of the Wilson loop unknotted operator in Chern-Simons-Witten theory (CSW) 2+1 dimension at the same group that has a convergent power series solution from order 1 / kn (k is a coupling contant). From comparison calculation of invariant polynomial and VEV of SO(5) group, we have the identical result  of them up to 1 / k3 order.Keywords : Invarians Polynomial, CSW, Wilson loop operator, SO(5).
PENCITRAAN STRUKTUR BAWAH PERMUKAAN KOMPLEKS MENGGUNAKAN METODE PRE-STACK DEPTH MIGRATION DENGAN ALGORITMA HORIZON BASED TOMOGRAPHY PADA LAPANGAN “MF-3D” Muhammad Fahmi; Hernowo Danusaputro; Udi Harmoko
Youngster Physics Journal Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A research in “MF-3D” field under Pre Stack Depth Migration method for 3D seismic reflection data has been carried out. PSDM selected to describing to perfect subsurface structure that obtain. This research aimed to applying initial interval velocity model determination method in PSDM to obtain better imaging subsurface structure with lateral velocity variation. Initial interval velocity model determination method which used was Dix Transformation and Constrained Velocity Inversion (CVI). Velocity model is quite sufficient to determining interval velocity in shallow layer and inclined flat under Dix Transformation. However, Dix Transformation precisely obtains less sufficient and unstable interval velocity in deeper subsurface layer. CVI conducted to determining initial interval velocity model which required to obtaining better and stable interval velocity in deeper subsurface layer. Both models required to obtaining initial model of 3D seismic section in depth domain as PSDM result. That model will get correction by using Horizon Based Tomography Algorithm in further step. This research yields initial 3D interval velocity model as input for PSDM process. Key Word: Pre Stack Depth Migration (PSDM), Constrained Velocity Inversion (CVI), Horizon Based Tomography
PENENTUAN NILAI KOEFISIEN SERAPAN BAHAN PADA BESI, TEMBAGA DAN STAINLESS STEEL SEBAGAI BAHAN PERISAI RADIASI Iwan Setiyawan; Heri Sutanto; K Sofjan Firdausi
Youngster Physics Journal Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (478.459 KB)

Abstract

Radiation shield is used to protect both workers and the general public from radiation. In Indonesia there are a lot of potential materials to be used as radiation shielding materials, such as iron, stainless steel and copper which these metals have a certain density and atomic number above 26. For the determination of the value of research material absorption coefficient and radiation dose on ferrous materials, stainless steel and copper as a radiation shield. The study was conducted at RS Happy land Yogyakarta using x-ray radiation source. In testing the absorption coefficient of the material in lead , iron , copper and stainless steel : The plane was set at a voltage, current and time on the conditions of 80 kV 32 mAs and 90 kV 40 mAs were fixed and the distance between the focus to the object as far as 100 cm, Multi Purpose Detector ( MPD ) was placed under the object, wide open field irradiation 5 cm x 5 cm, the center beam was placed right in the middle of the next object do exposure for each thickness of lead, iron, copper and stainless steel was done in sequence according to the thickness variation material. From the test results coefficient absorption material (µ) in iron, copper and stainless steel on condition exposure factor 80 kV 32 mAs showed μ for iron absorption coefficient of 0,76 / mm, copper of 1,16 / mm and stainless steel for 0,83 / mm. Results equality between iron, copper and stainless steel with lead to 1,3 mm thickness. Iron 8,9 mm, 5,8 mm copper and stainless steel 8,1 mm. Lead to a thickness of 2 mm, 13,7 mm iron, copper, stainless steel 8,9 mm and 12,5 mm. On condition exposure factor  90 kV 40 mAs showed μ for iron of 0,56 / mm, copper 0,92 / mm and stainless steel of 0,62 / mm. Results equality between iron , copper and stainless steel with Lead to a thickness of 2 mm, 17,5 mm iron, copper and stainless steel 10.6 mm 15,7 mm. Keywords: X - ray Unit, Multi Purpose Detector ( MPD ), Absorption Coefficient, Iron, Copper, Stainless Steel
PERBANDINGAN NILAI DENSITAS CITRA MENGGUNAKAN GRID BERGERAK (MOVING GRID) POSISI HORISONTAL DAN VERTIKAL Supriyati Supriyati; Wahyu Setia Budi; Heri Sutanto
Youngster Physics Journal Vol 2, No 3 (2013): Youngster Physics Journal Juli 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (474.838 KB)

Abstract

In making radiographs  often differences exposure  factors used when using  moving  of horizontal and vertical. This study aims to determine the comparative value of the density of the resulting image when using a moving grid of horizontal and vertical position. So that research results can be applied in an effort to improve the quality of the radiograph. The study begins with the initial  test  without the grid to determine   density value, the second initial test using a moving grid both  horizontally  and vertically without  the  use  of material / objects.  Research   continued with three  aluminum thickness variation are  1 mm, 3 mm and 5 mm. Then using acrylic  material three thickness   variation are 1 cm,  2 cm and 3 cm. Results of image density measured using a densitometer.Results are then analyzed the data.  The  results  of research  show   value  of   the   image   using  horizontal    grid  density has    smaller  values  than    the  vertical    but   still within the   range  of  values density using   vertical   grid.  Thus   it can    be  said    that    the   image  density  values using  moving    grid   horizontal   position   is  not different with    density  of  the image using a vertical grid at the same exposure factors.Keywords: radiograph,  moving grid,  density,  comparison value
RANCANG BANGUN SISTEM TELEMETRI UNTUK MONITORING GAS KARBON MONOKSIDA MENGGUNAKAN JARINGAN WIFI Arifin Budi Putro; Suryono Suryono
Youngster Physics Journal Vol 5, No 2 (2016): Youngster Physics Journal April 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (351.905 KB)

Abstract

Development of science and technology is growing rapidly, especially in the field of electronics. Many human activities and industrial activities that produce pollutant gases such as CO disturb the environment. It needs a CO gas concentration monitoring tool for controlling the gas in the environment. The tool is made to measure the concentration of CO gas from long distance so that the monitoring can be done safely by using telemetry. The telemetry system is built by using minimum system microcontroller ATmega8535 to convert analog to digital data from the sensor. For the measurement of the CO gas concentration using MQ-7 sensor which utilizes USART as a serial data communication and WiFi as a wireless data transmission. The result of reading ADC value from MQ-7 sensor is converted into concentration value. The data that has been acquired by a computer then stored in a database and transmitted through WiFi network. Testing of the data transmission system is done by sending a number of data from transmitter to receiver. The comparison of data that is sent and received has an error rate of 0%. Data viewer interface is made using HTML and PHP by displaying several variables such as: temperature, humidity and CO gas concentration. Web browser is used to access the database of the transmitter by entering the IP address of the PC on the transmitter. This CO gas measurement tool helps the efficiency of time in the measurement and be safe in monitoring because it is done from long distance.Keywords: Telemetry, MQ-7 sensor, WiFi, CO, database.
PENGARUH BLOK INDIVIDUAL BERBAHAN CERROBEND PADA DISTRIBUSI DOSIS SERAP BERKAS FOTON 6 MV LINEAR ACCELERATOR (LINAC) Afrio Rika. R; Eko Hidayanto; Zaenal Arifin; Sanggam Ramantisan
Youngster Physics Journal Vol 3, No 3 (2014): Youngster Physics Journal Juli 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (576.153 KB)

Abstract

Individual blocks were often used as accessories irradiation in radiotherapy to protect organs at risk (OR). Therefore, the study was examined distribution of absorbed dose on the phantom horizontal axis due to the effect of using individual blocks made of cerrobend with variations of individual blocks surface area  and variation form individual blocks divergent and non-divergent then determined whether exceeding the tolerance limit.The used of Irradiation technique was a Linear Accelerator (LINAC) with 6 MV photons at dmax of 1.5 cm with SSD 100 cm, wide field irradiation by 20 cm x 20 cm, with the considered organs protected by 10 cm x 10 cm. Individual block made of cerrobend was shaped divergent and non-divergent with variations of surface area projections by 9 cm x 9 cm, 9.5 cm x 9.5 cm and 10 cm x 10 cm.The use of divergent and non-divergent blocks at the Organ at Risk (OR) and irradiation target exceeded the tolerance limit of the absorbed dose was on the OR transmission dose over the maximum permitted limit of 5%, while the results obtained from the study ranged from 6,0% - 6.8%, on irradiation target results obtained ranged from 101.3% - 109.6% while the tolerance permitted by ICRU  (The International Commission on Radiation Units and Measurements) Report 62 was -5% and +7%. In the transition area doses below 50%, remained <50%. Moreover, the distribution dose on the divergent block was better than the non divergent.Keywords: Absorbed dose distribution, divergent block, non-divergent block, transmission dose, target dose, transition dose, cerrobend.
Pengaruh Ozon yang Dibangkitkan Melalui Reaktor Plasma Berpenghalang Dielektrik Elektroda Silinder Spiral Terhadap Pengawetan Cabai Saraslifah Saraslifah; Muhammad Nur; Fajar Arianto
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (338.853 KB)

Abstract

Research on the effects of ozone generated by the plasma reactor cylindrical spiral electrode to the shelf life of chili has been done in Plasma Physics Laboratory, Diponegoro University. This study aims to obtain optimal voltage values to produce maximum ozone. And obtaining effect of ozonation time and storage for chili quality. Ozon which used is produced by dielectric barrier discharge plasma reactor with spiral cylinder configuration. This ozon , which produced by the reactor dissolved in water for washed the chili. Chili using ozone washing is done with a variety of washing time 0,5,10,15,20,25 and 30 minutes. The chili then stored in a refrigerator at a temperature of 17 ℃ for 25 days. Characterization of the reactor showed that the greater value of the applied voltage, increased current and concentration of ozone produced. Voltage used for ozonantion is 2400 V with a concentration of ozone generated at 23.75 ppm. Ozone dissolved in water to wash the chili with dissolved ozone concentration is 1.66 ppm or 7%. From the analysis of the level of damage chili, ozonation results with lowest damage rate is at the time of treatment 15 minutes with a percentage of 8% damage to the shelf life of 25 days. From the test results of proximate preservation chili using ozone is not particularly affect the content in chili peppers that is safe to use. The longer the treatment time, reduce the amount of bacteria on pepper growing. At thetime of treatment 15 minutes colonies of fungi reduced til 50,8 % and bacteria were reduced 51.7%. It seen from the results of TPC (Total Plate Count).
PERHITUNGAN NILAI DOSIS DAN KONTRAS CITRA COMPUTED RADIOGRAPHY (CR) DENGAN VARIASI KETEBALAN DAN KOMBINASI JENIS FILTER Dessy Dian Monita Pardede; Evi Setiawati
Youngster Physics Journal Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (130.355 KB)

Abstract

The research about calculation of dose values and image contrast computed radiography has done with thickness variation and combination type filter.  Additional filters are ideal able to absorb all of the energy is low and continuing high energy X-rays. Materials filters are often used in radiodiagnostic is Aluminum (Al). This researc used material such aluminum (Al), stainless steel (Ss), Zinc (Zn) and combine the filter to get low dose withhigh contrast quality.The thickness of the filter are 0.5 mm, 1 mm, 1.5 mm, 2 mm of the three types of filter material with maximum combination thickness of the filter material is 2 mm.  Irradiation performed with a Shimadzu brand X plane by a factor of 3.55 eksposi 50 kVp and mAs with an area of 15 x 15 cm field using the object stepwedge. Dose measurements performed with the detector R100B while the contrast of the image is determined by calculating the gray value of image by using the technique of ROI (Region of Interest) on any object thickness stepwedge.Measurement of dose and image contrast value obtained some filters that generate a low dose with high image contrast. The use of one type of filter that produces low-dose and high image contrast are on filters Al 0.5 mm, Al 1 mm, Al 1.5 mm, Al 2 mm, Zn 0.5 mm, Zn 1 mm, Ss 0.5 mm. While the use of a combination of the type of filter that produces a low-dose and high image contrast value are on 0.5 mm Al + Zn 0.5 mm, 1 mm Al + Zn 0.5 mm, 0.5 mm Al + 0.5 mm Ss, 1.5 mm Al + Zn 0.5 mm, 1.5 mm Al + 0.5 mm Ss and  Ss 0.5 mm + 0.5 mm Zn. By combining this type of filter then obtained a lower dose compared with only one type of filter material. Keywords: Radiodiagnostic, additional filters, Dose, Gray value, Image contrast radiography, Computed Radiography (CR)

Page 19 of 29 | Total Record : 282

 17   18   19   20   21 

Filter by Year

2012 2018


Reset
Filter By Issues
All Issue Vol 7, No 2 (2018): Youngster Physics Journal April 2018 Vol 7, No 1 (2018): Youngster Physics Journal Januari 2018 Vol 6, No 4 (2017): Youngster Physics Journal Oktober 2017 Vol 6, No 3 (2017): Youngster Physics Journal Juli 2017 Vol 6, No 2 (2017): Youngster Physics Journal April 2017 Vol 6, No 1 (2017): Youngster Physics Journal Januari 2017 Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016 Vol 5, No 3 (2016): Youngster Physics Journal Juli 2016 Vol 5, No 2 (2016): Youngster Physics Journal April 2016 Vol 5, No 1 (2016): Youngster Physics Journal Januari 2016 Vol 4, No 4 (2015): Youngster Physics Journal Oktober 2015 Vol 4, No 3 (2015): Youngster Physics Journal Juli 2015 Vol 4, No 2 (2015): Youngster Physics Journal April 2015 Vol 4, No 1 (2015): Youngster Physics Journal Januari 2015 Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014 Vol 3, No 3 (2014): Youngster Physics Journal Juli 2014 Vol 3, No 2 (2014): Youngster Physics Journal April 2014 Vol 3, No 1 (2014): Youngster Physics Journal Januari 2014 Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013 Vol 2, No 3 (2013): Youngster Physics Journal Juli 2013 Vol 2, No 2 (2013): Youngster Physics Journal April 2013 Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012 More Issue