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 14 Documents
 1   2 
Search results for , issue "Vol 6, No 2 (2017): Youngster Physics Journal April 2017" : 14 Documents clear
Fenomena lucutan plasma dengan jarum suntik sebagai elektroda aktif pada kondisi atmosfer Irfan Handoko
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 (840.619 KB)

Abstract

An observation of the plasma discharge phenomenon has been observed in the atmospheric conditions with a syringe as an active electrode. This study aims to obtain the characteristics of plasma generation and discharge from plasma generated. The method used in this experiment uses a plasma reactor with a dot-zone configuration given DC voltage (HV DC). Syringes are treated as point electrodes and aluminum plates as field electrodes mounted perpendicularly. The distance between the electrodes varied 2, 4, 6 and 8 mm, the syringes used in the experiment had a length of 4 cm with a diameter of 0.6 mm. The results obtained show that the distance between electrode effect on the magnitude of the voltage to achieve arc discharges. At the smallest distance 2 mm arc discharge occurs after a given voltage exceeds 250 Volts, while the largest distance of 8 mm exceeds 1000 Volts. The visible shape when the syringe is given positive or negative polarity from a purple incandescent light source at the needle tip with a measured current of 35-150 μA. After reaching the arc measurable current measured 1-4 mA, on the positive polarity of the discharge in the form of flashes of lightning connecting the distance between the electrodes and the increase of flash currents are also more and more, while when given the negative polarity of arc discharge in the form of flash of lightning but with increasing arc discharge current look like Mini sun. This happens because the temperature at the time of the syringe is treated as a larger cathode because the ion particles that strike the cathode are very radical to erode syringes such as NO +, O +, N + and are highly reactive. Keywords: arc discharge, point to plane reactor, syringe, point electrode, mini sun.
Pemodelan inversi gayaberat dengan panduan Euler deconvolution untuk struktur bawah permukaan di Lapangan Panas Bumi ”B24” Brandan Tito Ramadhan; Agus Setyawan; Dwi P. Sasongko; Imam Baru Raharjo; R. M. Tofan Sastranegara
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 (930.469 KB)

Abstract

Gravity data inversion requires a good initial mesh model to generate a good subsurface model. Ambiguities in gravity data can be reduced by Euler deconvolution’s point cluster result that show its position and depth. These point cluster can give an additional information to shape the initial mesh model for inversion. The purpose of the study was to determine the influence of Euler deconvolution to the inversion. Inversion was done by the steepest descent algorithm. Euler deconvolution method and inversion algorithm were tested on synthetic models and showed good results that Euler deconvolution able to construct actual density distribution. These methods were applied to the gravity data on the "B24” geothermal field. Residual anomaly map has a value of -12 to 24 mGal. The geothermal field is estimated that it has a major fault which mainly striking in northwest-southeast direction. These estimates are supported by the results of Euler deconvolution which indicate the presence of fault and graben structure. Euler deconvolution and inversion method were applied perpendicularly to the main structure at the southwest-northeast direction. The results of this study are the Euler deconvolution method is able to provide information for a mesh geometry for inversion. From the inversion result, “B24” geothermal field is estimated has a high-low-high density distribution dominated by andesite and tuff. To improve the results of the research, it needs a measurement point addition, additional modeling area, geological and geochemical data to strengthen the interpretation.Keywords: density, Euler deconvolution, gravity inversion, geothermal
Analisis persebaran hidrokarbon pada reservoir batupasir menggunakan AVO dan pemodelan probabilitas fluida pada sumur menggunakan metode AVO fluid inversion (Studi kasus lapangan “YMK” formasi Talang Akar, Cekungan Jawa Barat Utara) Prasetyo Abdi; Hernowo Danusaputro; Mualimin Mualimin
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 (1458.29 KB)

Abstract

AVO analysis methods can be used to determined the hydrocarbon zones through AVO attribute that is a function of P wave velocity, S wave velocity and density. Map attributes are the result of AVO inversion process. Based on results of AVO response can be seen that the target area is a class IIp gas sand which is characterized by polarity reversal. AFI method provides results of probability modeling in wells using fluid substitution based on Gassmann’s equation. Fluid substitution result that consisting of P wave velocity, S wave velocity and density then used as input to get the intercept and gradient of each fluid brine, oil and gas. By adding a synthetic form of attribute data simulation intercept and gradient for various possible fluid content, probabilities can be calculated using Bayes' theorem. In this study the spread of hydrocarbons can be illustrated by a map of attribute and probabilities in the wells can also be known based on synthetic data from simulation. Analysis showed that the method AFI containing oil wells are wells SNI-01 with a probability value of 0.70 and containing gas wells are wells SNI-03 with a probability value of 0.68.Keywords: AVO, Fluid inversion, hydrocarbon, reservoir, probability
Karakterisasi reaktor plasma berarus positif dengan konfigurasi elektroda multi garis-bidang Sholehah Aisyah; Muhlisin Zaenul; Arianto Fajar
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 (207.169 KB)

Abstract

Plasma technology is the most widely researched technology. Research on various types of plasma reactors began much done in order to obtain plasma which has high homogeneity. This study aims to obtain plasma discharge characteristic I-V relations in the plasma reactor wire-plate electrode configuration. This study uses nine electrodes wire with a length of 12 cm and a diameter of 0.38 mm as the positive electrode and PCB as a negative electrode plates. Characterization of plasma corona wire-plate is done by adjusting the distance between the electrodes of 1.8 cm, 2.1 cm, 2.4 cm, 2.7 cm, 3.0 cm, 3.3 cm, 3.6 cm, 3.9 cm, 4.2 cm, and 4.5 cm. The results showed that the current increases with the applied voltage and inversely proportional to the distance between the electrodes. In the future this method it is possible to be applied on an industrial scale.Keywords: Plasma corona, plasma corona wire-plate
Prototype sistem pakar diagnosis penyakit diabetes Catur Edi Widodo
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 (118.633 KB)

Abstract

Every member of the community can experience a variety of diseases. The disease can be known from the symptoms it produces, but to know the exact type of disease, needed a doctor or a health professional. Since the number of doctors or health professionals is very limited and can not overcome the problems of the community at the same time, a system that has the capability of a doctor or health professional is required, which in this system contains the expertise of a physician or health professional on diseases and diseases. In this study was designed expert system using rule base (reason based reasoning) with forward chaining and backward chaining inference method that is intended to assist the community in diagnosing the disease. This disease diagnostic expert system developed has advantages in ease of access and ease of use. With the features that are owned, expert systems for the diagnosis of diseases that built can be used as a tool for disease diagnosis and can be accessed by the public to overcome the problem of limited number of doctors or health experts in helping people diagnose the disease.Keywords: disease, expert system, backward chaining, forward chaining, rule-based reasoning
Aplikasi gelombang ultrasonik untuk pengukuran tingkat kekasaran permukaan beton Heri Sugito; Diana Layla Riskawati
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 (247.471 KB)

Abstract

The measurement of surface roughness level of matter was done by ultrasonik wave Time-of-Flight methode. The device can be applied to several equirement, such as roughness detection for textile product, sandpaper,asbestos, ceramics, steel and metal industry, etc. The measurement is needed for quality product improvement.  The measurement performed by scanning object which rotated 200 times with stepper motor using ultrasonic transduser. The transduser transmit pulse to object trough transmitter and receiver pulse. The result of scanning displayed in Cathode Ray Osciloscop (CRO) then it used to estimating ToF (Time-of-Flight) by calculating the gap between transmitter pulse and receiver pulse. The objects which measured are tree trunk, concrete A, and concrete B. The reason of selecting the test object is for minimize the atenuation so it can increase the reflection. The result of measurement for average surface roughness of objects are: tree trunk (Ra is minimum 8%, and Ra is maximum 17%), concrete A (Ra is minimum 10%, and Ra is maximum 16%), and concrete B (Ra is minimum 8%, and Ra is maximum 17%).Keywords: surface Roughness, ultrasonic wave, Time-of-Flight
Pemodelan 2D sistem pana bumi daerah Garut Bagian Timur menggunakan metode magnetotelurik Riznia Aji Salam; Udi Harmoko; Tony Yulianto
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 (786.533 KB)

Abstract

This research was conducted in the eastern part of the Garut area using magnetotelluric method that aims to create 2D model of the geothermal system based on distribution of rock resistivity value. Magnetotelluric method is used because it is able to identify subsurface structure to a depth of thousands of meters. In this research, the data measured from 9 different targets area and processed based on the flow such as converting time domain data into the frequency domain, identify noise data, perform two-dimensional inversion modeling and create geothermal systems. Based on the results, also compared with the interpretation of geological data and geochemistry of rocks known clay cap, reservoir, and hot rock. Furthermore, Clay cap has a value of 4-32 Ωm resistivity on depth of 3000 m. Reservoir rock with resistivity value of 64-512 Ωm at a depth of 1500-5000 m. While hot rock with 1024-8192 Ωm resistivity value is under the reservoir rock.Keywords: Magnetotelluric, Eastern section of the Garut, geothermal system, resistivity
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).
Identifikasi geological strike dan dimensionalitas berdasarkan analisis phase tensor untuk pemodelan 2D magnetotelurik di lapangan panas bumi “GYF” Ganap Y. Febrika; Agus Setyawan; Muhammad Irham Nurwidiyanto; Imam B. Raharjo
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 (1219.374 KB)

Abstract

Magnetotellurics method is frequently used in exploration of geothermal resources for determining the subsurface resistivity distribution of the Earth. An accurate representation of the Earth’s resistivity structure can be obtained by knowing the direction of geoelectrical strike and dimensionality structure prior to modelling. Besides those both cases, distortion in the data magnetotelluric can lead to errors of interpretation. Therefore, this study was conducted to identify the geoelectrical strike direction and dimensionality structure in the “GYF” geothermal field using phase tensor analysis prior to 2D modelling. Three invariant parameters of phase tensor i.e ellipticity, phase tensor skew angle (β) and Azimuth of phase tensor maximum (α-β) are used to get the information about the dimensionality and geoelectrical strike direction on 65 magnetotelluric data in “GYF” geothermal field. Results of the phase tensor analysis show that the direction of geoelectrical strike is N60°W or 300° at frequency (10-0,2 Hz) and dimensionality of subsurface structure consists of a structure 1D, 2D and 3D. Structure of 1D and 2D is in the frequency range 320 to 0,2 Hz, while the 3D structure is at a low frequency, ie f < 0,2 Hz. Identification of geoelectrical strike and dimensionality in 2D magnetotelluric modelling can minimize misinterpretation.Keywords: Dimensionality, geoelectrical strike, distortion, phase tensor
Karakterisasi sistem pembangkit aliran elektrohidrodinamika lucutan korona positif berkonfigurasi elektroda kawat-bidang Sumariyah Sumariyah; Azzuma Hasna Azzulkha; Muhammad Nur; Zaenul Muhlisin
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 (204.505 KB)

Abstract

The characterization of electrohidrodynamic flow generation system (EHD) has been performed utilizing positive corona discharge configured wire-plate electrode. In this study, the characteristics of the EHD flow generation system in the form of current characteristics as a function of voltage or I-V characteristics with fixed geometry factor, in the without of lubricating oil and with the lubricating oil. The fixed geometry factor was obtained from the radius of the fixed point (r) electrode with various the electrode distance (d). This research was conducted by using positive corona incandescent discharges with wire field electrode configuration. The wire electrode used is made of stainless steel having a length of 5 cm, with wire diameter 0.11 mm, 0.14 mm, 0.21 mm, 0.36 mm, and 0.38 mm. Electrode of field used in the form of circle with diameter 20 cm. Data collection system with variation of voltage, variation of electrode distance, and variation of wire electrode diameter used. Furthermore, data analysis of measurement results was carried out. From the result of characteristic research of EHD flow generator system in the form of current as a function of voltage shows that the increase of voltage is proportional to current increase. While the current as a function of geometry shows the value of the current flowing inversely proportional to the geometry factor of the electrode distance change.Keywords:electrohydrodinamic, ion wind, positive corona discharge 

Page 1 of 2 | Total Record : 14

 1   2 

Filter by Year

2017 2017


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