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BERKALA FISIKA
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
BERKALA FISIKA adalah jurnal saintifik yang diterbitkan secara periodik 3 bulanan. Jurnal ini memuat kajian-kajian Fisika baik kajian teoretik maupun hasil eksperimen. Jurnal ini juga memberi ruang yang luas bagi kajian – kajian aplikasi fisika dalam bidang teknologi, ilmu-ilmu hayati dan kedokteran.
Arjuna Subject : -
Articles 369 Documents
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Koreksi Gaya Berat Akibat Curah Hujan Pada Pengukuran Gaya Berat Mikro Antar-Waktu Lapangan Panas Bumi Kamojang 2006-2007 Zaenudin, Ahmad
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
Publisher : BERKALA FISIKA

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Abstract

Shallow groundwater level changes cause seasonal gravity anomaly. Changes in groundwater level is directly related to rainfall, when heavy rainfall, groundwater level rises rapidly and then declined gradually. Gravity anomaly due to the season is important to take into account noise. Changes in groundwater level due to rainfall is calculated using empirical equations, and the Gravity response calculated using the approach of an infinite Bouguer slab correction by entering the porosity factor. The rainy season in the Kamojang geothermal field occur between November to June and dry season between July to October. The highest rainfall in 24 hours occurred on December 8 by 75 mm. From the empirical calculations showed that changes in groundwater level due to rainfall period November 2006-June 2006 amounted to -1.502 m and July 2007-June 2006 amounted to +0.396 m. Based on the approach slab Bouguer corrected gravity anomaly not to cause inter-time respectively -18.89 and +5.98 mikrogal mikrogal for porosity of 30%. Changes in groundwater level is negative (a reduction of groundwater) caused gravity anomaly time inter-negative, and vice versa. Correction of the gravity anomaly due to inter-time rainfall should not be ignored because of the gravity anomaly at the time inter-geothermal field is usually small.   Key words: rainfall, groundwater level, inter-period gravity anomaly
Studi Analisis Echo Train Length dalam K-Space Serta Pengaruhnya Terhadap Kualitas Citra Pembobotan T2 FSE pada MRI 1.5 T Simanjuntak, Josepa ND; Nur, Muhammad; Hidayanto, Eko
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
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Abstract

The influence of echo train length (ETL) toward image quality of sagital lumbal on MRI using T2-weighted FSE was analyzed on 20 images from four patients. Quantitative data analysis was performed using ROI two methods: image processing method on MRI’s computer and using matlab software, then conducted the statistical test. The result of SNR from these two methods obtained the highest value of SNR at CSF tissue and the highest value of CNR at CSF-corpus tissue and CSF-medulla spinalis with ETL=16. From statistical test of SNR result directly from MRI’s computer image was obtained the significant value at corpus tissue = 0.603, CSF = 0.082, and Fat = 0.213 (P > 0,05), discus = 0.022, Medulla Spinalis (MS) = 0.010 (P < 0.05), and for CNR result of CSF-corpus tissue has significant value = 0,023, corpus-MS = 0.011 (P < 0.05). By using matlab programming method obtained significant SNR result at corpus tissue = 0.000, CSF = 0,000, Fat = 0,000, discus = 0,000, Medulla spinalis = 0,000 (P < 0,05), and for the CNR result of Dicus-corpus tissue has significant value = 0.044, Dicus-MS= 0.045 (P , 0.05). These results pointed out that ETL and T2 weighted influence the Image quality of MRI, which are the image contrast at FSE and software ability of matlab to analyze the image quality of MRI. SNR and contrast are important aspect in the process of image optimization, the higher SNR value provide the better image in giving diagnose information. Keywords : MRI, Echo train length (ETL), K-space, Fast spin echo, Contras to noise ratio, Signal to noise ratio.
Efektivitas Polyvinyl Acetate (PVAc) Sebagai Matriks Pada Komposit Sampah Masturi, Masturi; Mikrajuddin, Mikrajuddin; Khairurrijal, Khairurrijal
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika
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Abstract

It was fabricated a composite using solid waste as filler and polyvinyl acetate (PVAc) as matrice. This work is as a solution of more serious solid waste problems. The solid waste used is paper waste and leaf one with their composition are 60% and 40% respectively. The crushed-solid waste then hot-pressed at 100 MPa of pressure and 150°C of temperature. Then, the compressive strength of composite before and after PVAc presence was investigated to get a composition in which the compressive strength is optimum.   Keywords: composite, solid waste, polyvinyl acetate, compressive strength.
Penentuan Kandungan Unsur Krom dalam Limbah Tekstil dengan Metode Analisis Pengaktifan Neutron Khaerani, Nina; Azam, Much.; Firdausi, K. Sofjan; Soeleman, Soeleman
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
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Abstract

A determination of chromium which consisted in textile cesspool one of the company of textile residing in Ungaran using neutron activation analysis method.The sample has been threated in the form of sediment sample and liquid sample. The sample then an irradiated by Lazy Susan irradiation facility at Kartini reactor for six hours and then  the counting is done by HPGe detector for 300 seconds. The qualitative results shown that samples contents Cr-51. The quantitatively sediment sample chromium element rate equal to 491. 67 ppm and liquid sample chromium element rate equal  to 0.011  ppm Key words: Neutron Activation Analysis, irradiation.
PENGARUH GAIN TERHADAP FWHM DAN FWTM PADA CITRA B-MODE ULTRASONOGRAM (USG) Amitasari, Ria; Suryono, Suryono; Adi, Kusworo
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015
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Abstract

The effect of gain to The Width at Half Maximum (FWHM) and Full Width at Tenth Maximum (FWTM) on B-mode image ultrasonogram (USG) has been investigated. The aim of this research is to determine the effect of gain on the spatial resolution according the measurements of FWHM and FWTM. The evaluated resolution type is axial and lateral. This research used phantom multipurpose multi tissue with gain (30 dB, 35 dB, 40 dB, 45 dB, 50 dB, 55 dB and 60 dB) on frequency variation source 6,2 Mhz, 8 MHz dan 10MHz. The axial and lateral resolution images were obtained by using USG which uses B-Mode imaging. The measurement was made by using digital image and calculated objectively with MATLAB. The measurement of FWHM and FWTM was obtained from IP-PSF analysis (In Plane-Point Spread Function) using approximation for the Gaussian function. The result shows that there is influence from gain on FWHM and FWTM. The decreasing gain resulted in decreasing of FWHM and FWTM. The decreasing of FWHM and FWTM represents better spatial resolution, and vice versa. Keywords: FWHM, Gain, Point Spread Function, Spatial resolution, USG,
STUDI SIFAT ELEKTROOPTIS PADA KACA AKUARIUM, KACA PREPARAT, DAN AKRILIK Nila Kusuma, Anis; Firdausi, K. Sofjan; Setia Budi, Wahyu
BERKALA FISIKA Vol 9, No 2 (2006): Berkala Fisika
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Abstract

The properties of electrooptics of transparency media such as aquarium glass, micro slides, and acrylic have been studied. To obtained the change of refractive index (Dn) of materials against external static electric field (E), the samples are placed in two parallel plates applied by potential different of  0 – 104 V. The maximum external field reached by this experiment is in order 106 V/m. The change of refractive index as function of E is measured by Michelson interferometer equipment. First, our results show that the refractive index decreases as E increases for all samples. Second, Dn varies slightly square to E, which is still the dominant of linear electrooptic coefficient. The graphs both of acrylic and slides are rather smooth, which indicates that the crystal structures are more regular than aquarium glass. Key Words: electrooptics, refractive index, static electric field
TINGKAT KETERBACAAN, KETERUNDUHAN, DAN SITASI BERKALA FISIKA Anam, Choirul
BERKALA FISIKA Vol 22, No 2 (2019): Berkala Fisika Vol. 22 No. 2 Tahun 2019
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Abstract

Tingkat Keterbacaan, Keterunduhan dan Sitasi Berkala Fisika
Estimasi Penyebaran Sedimen Cekungan Jawa Timur Dengan Metode Gravity Adib Hasan, Muhamad; Nurwidyanto, M. Irham
BERKALA FISIKA Vol 11, No 4 (2008): Berkala Fisika
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Abstract

This research is a reconnaissance study to predict the distribution and depth of the sediment basin in East Java based on Bouger Anomaly data in gravity method.Bouger anomaly is projected to flat plane used by equivalent point mass source method. Upward continuation is used to separate the regional and residual anomaly.  Modeling sub surface in two dimensions are used by polygon Talwani method by help computer program Geomodel.The results of this research can be concluded that in East Java sediment basin has about 6 km in depth. The central basin are reside in mid of East Java, there are around Sragen, Karanganyar, Ngawi, Madiun, Nganjuk, Kediri, Bojonegoro, Jombang and Mojokerto which in the east west direction. In the eastern part of East Java Basin there are Sidoarjo, Pasuruhan, Probolinggo and Maura bay has direction in northwest to southeast. Key words: Basin, basement, sediment, Bouger Anomaly
Analisis Korelasi Kondisi Pembuatan Film Tipis Polipropilen (PP) dan Sifat-Sifat Mekaniknya Dengan Metode Uji Tarik Kartika Sari; Rahmat Satoto
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Condition Correlation Analysis of Thin Film Polypropylene (PP) and Attributes Mechanical Tensile Testing Method has been performed in Polymer Test Lab located at LIPI Bandung. This study aims to examine the relationship between the manufacture of thin film with a three-siftat sisitem cooling and mechanical properties. Sample material used is Polypropylene (PP) Y101XX grain pellets. Then the material is arranged on the aluminum frame of the heating plate and plastic transparencies of six samples. Such materials will be heated with two variations of temperature at the same time given the pressure by using the hot press Gonno-02 326 at 175oC and 225oC and given three different treatment when the cooling process that is in the chill with ice water (quenching), in the chill on cold press and cooled until it reaches room temperature by turning off the heater. Samples that have formed a thin film forming dipotopng Dumbbell type ISO 527-2. Of the six films produced by two samples with different cooling systems made seven Dumbbell. Then Dumbbell-dumbbell was conducted testing of mechanical properties by measuring the strain, stress and elastic modulus using a tensile test using a Universal Tensile Tester.   Keywords: Polypropylene (PP), Thin Film, Universal Tensile Tester  
Berkala Fisika Vol. 16 No. 3 2013 Berkala Fisika, Tim Redaksi
BERKALA FISIKA Vol 16, No 3 (2013): Berkala Fisika
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Abstract

Berkala Fisika Vol. 16 No. 3 2013

Page 25 of 37 | Total Record : 369

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