Articles
282 Documents
<![CDATA[PENENTUAN PREKURSOR GEMPA BUMI MENGGUNAKAN DATA MAGNETOTELLURIK DI DAERAH PELABUHAN RATU ]]>
<![CDATA[Noviana Fransiska]]>;
<![CDATA[Agus Setyawan]]>;
<![CDATA[Boko Nurdiyanto]]>
<![CDATA[ Youngster Physics Journal Vol 2, No 3 (2013): Youngster Physics Journal Juli 2013 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (699.374 KB)
<![CDATA[The research has been done by using data of electromagnetic parameter base on the result of magnetotelluric observation which located in geophysics observation Pelabuhan Ratu. Research of earthquake precursor in order to find out the characteristic of electromagnetic signal by applying spectral analysis ratio method on Ultra Low Frequency (ULF). The data is electromagnetic secondary data from observation result of magnetotelluric and data of Dst index year 2011. The data magnetotelluric is consist of electric component and magneict component. The filtering data is executed by using wavelet method. Result of filtering will be shown as graph ratio of magnetic field and electric field spectral intensity in a time domain. According to the analysis by using spectral density analysis can be found out that the characteristic of ULF signal on frequency 0.01 Hz before earthquake show that there is an increase of value for magnetic polarization and occurred decrease of EM wave impedance value. From the analysis result show an appearance of magnetic polarization anomaly which expected as earthquake precursor and can be seen around 10 – 19 days before the occurrence of earthquake while for the value of EM wave impedance can be seen around 23 – 40 days before earthquake.Keywords : Precursor, Ultra-Low-Frequency, Spectral Density Ratio Analysis, Pelabuhan Ratu]]>
<![CDATA[IDENTIFIKASI LETAK DAN JENIS SESAR BERDASARKAN METODE GAYABERAT SECOND VERTICAL GRADIENT STUDI KASUS SESAR LEMBANG, KOTA BANDUNG, JAWA BARAT ]]>
<![CDATA[M Wildan Firdaus]]>;
<![CDATA[Agus Setyawan]]>;
<![CDATA[Mahmud Yusuf]]>
<![CDATA[ Youngster Physics Journal Vol 5, No 1 (2016): Youngster Physics Journal Januari 2016 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (217.749 KB)
<![CDATA[Gravity measurement has been done in Lembang area, Bandung on 2014. Measurement were perform with relative gravity (Scintrex CG-5) with 28 measuring point around Lembang fault. The aim of this research is to observe gravity response Bouguer anomali toward Lembang fault structure along 22 kilometers from eastern to west. In this research, we use second vertical gradient to known about the location and kind of fault structure. As the result from this research shown the Bouguer anomali has a distribution value around -2 mGal – 52 mGal, this result indicated that Lembang Fault are located between high and low Bouguer anomali. While the result from second vertical gradient indicated that Lembang Fault is a normal fault.Keywords: gravity, Bouguer, SVG, fault, Lembang]]>
<![CDATA[IDENTIFIKASI STRUKTUR RESISTIVITAS DAERAH GEOTHERMAL “T” BERDASARKAN HASIL PEMODELAN 2D DATAMAGNETOTELURIK ]]>
<![CDATA[Nur Rachmaningtias]]>;
<![CDATA[Agus Setyawan]]>;
<![CDATA[Imam Baru Raharjo]]>
<![CDATA[ Youngster Physics Journal Vol 3, No 2 (2014): Youngster Physics Journal April 2014 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (581.217 KB)
<![CDATA[Resistivity structure identification of magnetotelluric data was made at geothermal area“T”, located in southern Indonesia. This process is based on the modeling result of 2-dimention magnetotelluric data. The modeling result of magnetotelluric data shows relativity structure dissemination on a scale of 0-10 ohm.m in a thickness of 1 km (clay cap), on a scale of 10-100 ohm.m in a depth of 1-2 km (reservoir zone), and on a scale of 100-1000 ohm.m in a depth of 2-3 km (heat source zone). The result of relativity structure dissemination can be used to delineate an area with geothermal prospect around 12 km2. Keywords: magnetotelluric, 2 dimension modeling, structure resistivity]]>
<![CDATA[ANALISIS KERENTANAN AIRTANAH TERHADAP PENCEMARAN DI DATARAN ALLUVIAL KOTA SEMARANG MENGGUNAKAN METODE GOD DENGAN MEMANFAATKAN DATA RESISTIVITAS DAN DATA HIDROGEOLOGI ]]>
<![CDATA[Dhana Hastuti]]>;
<![CDATA[Tony Yulianto]]>;
<![CDATA[Thomas Triadi Putranto]]>
<![CDATA[ Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (1188.293 KB)
<![CDATA[Groundwater is the water resources necessary for living things and the most desirable human. Groundwater needs to increase as the population increase. One example is in the Alluvial Plain of Semarang. To supply water necessary, the population use a tap of aquifer shallow wells. Shallow aquifer vulnerable to contamination due to the effect of shallow depth and human activities. Therefore there is a needed to conduct for research on the groundwater vulnerability due to contamination. GOD is the system to determine of value groundwater vulnerability due to contamination. The parameters used are the type of aquifer (G), type of lithology aquitard (O), and the depth to groundwater table (D). These three parameters derived from resistivity data and hydrogeology data. The results of the analysis by this method has three levels of vulnerability of groundwater due to contamination the area of the vulnerability of low, moderate, and high. So it is recommended that the analysis can be made of the green open area to reduce contamination and groundwater catchment area is formed, and restrict the activities to achieve economic gains and reduce the danger of environmental contamination.]]>
<![CDATA[DETEKSI EFUSI PLEURA PADA CITRA THORAX MENGUNAKAN JARINGAN SYARAF TIRUAN PROPAGASI BALIK MELALUI EKSTRAKSI CIRI BINER ]]>
<![CDATA[Elvira Situmorang]]>;
<![CDATA[Kusworo Adi]]>;
<![CDATA[Evi Setiawati]]>
<![CDATA[ Youngster Physics Journal Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (224.208 KB)
<![CDATA[The research about detection pleural effusion of the thoracic using neural network back propagation by binary feature extraction has been done. A common cause of pleural effusion disease is cancer. It is estimated that pleural effusion malignant affects 150,000 people every year in the United States. The normal pleural space only has a few milliliters of liquid that helps lubricate of the lungs during breathing. Pleural effusion (large amounts of liquid in the pleural space) can lead to a partial or complete compression of the lung. The difficulty to distinguish excess accumulation of fluid in the pleural cavity should be minimized by radiologist. This research contributes interpretation pleural effusion in the thoracic and reduces doubts of doctor in the treatment of patients. The purpose of this research is to develop algorithms to identify pleural effusion using artificial neural networks back propagation by binary feature extraction the thoracic. Binary feature extraction is obtained from the level set segmentation. The process of image enhancement by histogram equalization and contrast enhancement should be performed before the level set segmentation process. Binary feature extraction patterns were training on ANN was taken from 5% until 25% of costophrenic angle in the thoracic. Neural network can recognize the characteristic patterns of the binary feature 15% are well trained. Validation ANN pattern training by up to 100%, while process of testing the ANN is able to identify 14 data from 15 test data to test validation value reaches 93.33% on the condition of setting 2 hidden layers, each of hidden layer contain 10 neurons. Keywords: Pleural effusion, Binary feature extraction, Artificial neural networks, Histogram, level set segmentation.]]>
<![CDATA[Analisis tingkat kontaminasi permukaan daerah kerja dan laju paparan radiasi pada Instalasi Kedokteran Nuklir ]]>
<![CDATA[Ukhti Lailun Nisa]]>;
<![CDATA[Gani Gunawan]]>;
<![CDATA[Zaenal Arifin]]>;
<![CDATA[Eko Hidayanto]]>
<![CDATA[ Youngster Physics Journal Vol 6, No 1 (2017): Youngster Physics Journal Januari 2017 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (643.313 KB)
<![CDATA[The surface contamination of the work area and the rate of radiation exposure at nuclear medicine installation have an effect to the safety workers and the society directly or indirectly. This study aims to analyze the level of surface contamination and the rate of radiation exposure on the nuclear medicine installation and to identify the activity of half time 99mTc and 131I. The used method is measuring the surface contamination of the work area caused by the use of radiopharmaceutical through the distance between the detector window and the 3 cm measured region. Meanwhile, the rate of radiation exposures is used to measure the sides of each room with a distance 1 meter in the area control and to measure the activity of radioisotope that is monitored once every an hour for 6.03 hours to 99mTc and every day for 8 days to 131I of the initial measurement and compares with the result calculation. The measurement result of the level of the surface contamination in various areas of all rooms is 0.000-5.272 Bq/cm2 and it is classified into low to medium level of contamination. The measurement result of the rate of radiation exposure in the control area is 0.022-1.404 µSv/h which is still classified under 10 µSv/h. So, it can be concluded that it is safe for workers and other patients. The use of radioisotope on the nuclear medicine installation in accordance with their needs and always consider to the principles of the radiation protection, therefore the level of contamination and the rate of radiation exposure is low. The result of the measurement and the calculation of the activity of 99mTc are decays into a half after 6.03 hours and the activity of 131I is decays a half after 8 days. Keywords: Radiation Protection, Contamination, The rate of Radiation Exposure Half Time Activity.]]>
<![CDATA[KEMAMPUAN SEGMENTASI MENGGUNAKAN METODE DRLSE (DISTANCE REGULARIZED LEVEL SET EVOLUTION) TERHADAP PENGARUH DERAU ]]>
<![CDATA[Abdillah Noor Fajrin]]>;
<![CDATA[Kusworo Adi]]>;
<![CDATA[Choirul Anam]]>
<![CDATA[ Youngster Physics Journal Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
<![CDATA[Abstract DRLSE (Distance Regularized Level Set Evolution) Segmentation has been tested in this research under salt & pepper noise, gaussian and speckle influence. DRLSE uses curve fluctuations to carried segmentation. First process, image was be activated by using each noise (gaussian, speckle, and salt & pepper). Afterwards, it was be carried to segmentation under DRLSE. Image activating by distinct noise will shows us DRLSE performances under noise influences. The result show us maximal variants value of following noise as follow: in the image gourd is salt & pepper 0.002, gaussian 0.002 and speckle 0.007. image dua objek is salt & pepper 0.004, gaussian 0.0001 and speckle 0.008. Keywords :segmentation,salt & pepper, gaussian, speckle.]]>
<![CDATA[STUDI PENGENDAPAN PERAK PADA LIMBAH FIXER YANG TELAH JENUH DENGAN METODE PEMBAKARAN DAN PENGENDAPAN NaOH DAN Na2S ]]>
<![CDATA[Dita Kesumayadi]]>;
<![CDATA[Heri Sutanto]]>
<![CDATA[ Youngster Physics Journal Vol 4, No 1 (2015): Youngster Physics Journal Januari 2015 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (721.795 KB)
<![CDATA[Research has been done in silver recovery in saturated fixer liquid. Silver recovery method that used in this research was sedimentation by using chemical material NaOH and Na2S. Aim of this research is to compare amount of mass of the result of sedimentation method in silver recovery using NaOH and Na2S. This research used NaOH and Na2S in 2 M concentration to saturated fixer liquid at 5 litre amount. Deposits included in koi then burned until 200-3000C of temperature to form two layers. The upper layer was removed homever the layers below let in the koi. Lower layer was burned back with a 400-6000C to remove the rest of the remaining impurities. When the temperature reaches 6000C, put it in a bucket of water in which that liquid will be solidified and acquired a silver metal. Result of The research have showed that silver which is produced in NaOH sedimentation method has 16 gram and 25 gram in using Na2S sedimentation method. Na2S is more profit because produce silver more than NaOH. Keywords : fixer, temperature, sedimentation method, NaOH, Na2S.]]>
<![CDATA[Perancangan sistem identifikasi biometrik jari tangan menggunakan Laplacian of Gaussian dan ektraksi kontur ]]>
<![CDATA[Aprilia Ayu Andarinny]]>;
<![CDATA[Catur Edi Widodo]]>;
<![CDATA[Kusworo Adi]]>
<![CDATA[ Youngster Physics Journal Vol 6, No 4 (2017): Youngster Physics Journal Oktober 2017 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (946.426 KB)
<![CDATA[In this modern era, the identification system is becomes an important thing to be able to analyze a person based on the characteristics he has. In general, a person's identification system is still using conventional techniques, such as using ID cards that are easy to get off and lost passwords or PINs that are easily forgotten. In this research, the design of the system to identify or recognize a person using biometrics, especially the hand using Laplacian of Gaussian edge detection and Contour Extraction was carried out. The identification system with biometrics has many advantages because it is always attached to the body and can not be separated with humans. Stages performed in image processing in the form of RGB image conversion into binary using threshodling, edge detection using Laplacian of Gaussian as well as contour extraction using chain code representation. The result of contour extraction is the number of pixels calculated on each segment of the finger divided into 8 sections. The matching process on the system is done by using euclidean distance, ie calculate the smallest distance of similarity between the test image and the database. The result of identification conducted in this research using the feature extraction method, obtained accuracy of 93.33%.Keywords: Finger Biometrics, Laplacian of Gaussian Edge Detection, Contour Extraction]]>
<![CDATA[APLIKASI METODE COMMON REFLECTION SURFACE (CRS) UNTUK MENINGKATKAN HASIL STACK DATA SEISMIK LAUT 2D WILAYAH PERAIRAN “Y” ]]>
<![CDATA[Hirafiany Daruartati]]>;
<![CDATA[Agus Setyawan]]>;
<![CDATA[Istiqomah Ari Kusuma]]>
<![CDATA[ Youngster Physics Journal Vol 4, No 4 (2015): Youngster Physics Journal Oktober 2015 ]]>
Publisher : <![CDATA[Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro ]]>
Show Abstract
|
Download Original
|
Original Source
|
Check in Google Scholar
|
Full PDF (1090.05 KB)
<![CDATA[Stacking is an important phase in the seismic data processing, it’s a tool or quick look before subsurface section resulted. Common Reflection Surface is the developing of the conventional processing that has been generally done. CRS method has more benefits than conventional stack method, specially on the complex structure and do not rely on from velocity model that’s really useful for seismic data processing. The main difference between CRS and conventional stacking mode is on stack parameter decision or the attribute connected to subsurface reflector. CRS application has been applied in the area “Y” using software ProMAX 2D. In this research by using marine seismic data has done five times using different apperture values, they are 150 m, 100 m, 67 m, 33 m, and 20 m for getting the best stack result. Based on the research can be concluded that CRS method has applicated successly on the 2D marine seismic data having a better result than by using conventional method, proved by CRS method stack result can show the better reflector continuity and it increases the signal to noise ratio qualitative.]]>
