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INDONESIA
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL)
Published by Universitas Negeri Jakarta
ISSN : 23021829     EISSN : 24769398     DOI : https://doi.org/10.21009/03
Core Subject : Science, Education, Engineering,
Electrical & Electronics Engineering Energy Physics Other
Focus and Scope: Physics education Physics Instrumentation and Computation Material Physics Medical Physics and Biophysics Physics of Earth and Space Physics Theory, Particle, and Nuclear Environmental Physics and Renewable Energy
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 976 Documents
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EVALUASI HILANG SIRKULASI PADA SUMUR M LAPANGAN B AKIBAT BEDA BESAR TEKANAN HIDROSTATIS LUMPUR DENGAN TEKANAN DASAR LUBANG SUMUR Cahaya Rosidan; Irfan Marshell; Abdul Hamid
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Abstrak.Lumpur pemboran adalah salah satu komponen utama yang menentukan kelancaran dan keberhasilan suatu operasi pemboran. Sistem lumpur yang digunakan pada suatu operasi pemboran harus sesuai dengan kondisi formasi serta lithologi yang harus ditembus. Komposisi dan sifat fisik lumpur sangat berpengaruh terhadap suatu operasi pemboran, karena salah satu faktor yang menentukan berhasil tidaknya suatu pemboran adalah tergantung pada lumpur bor yang digunakan. Kecepatan pemboran, efisiensi, keselamatan, dan biaya pemboran sangat tergantung dari lumpur pemboran yang digunakan. Karena berbagai faktor pemboran yang ada maka lumpur pemboran mutlak diperlukan pada proses tersebut. Dalam penggunaannya lumpur pengeboran dapat dicampur dengan material-material lain sebagai sarana pengontrol sifat lumpur tersebut. Material-material tersebut digunakan untuk menghindari masalah-masalah yang dapat timbul selama operasi pengeboran berlangsung. Masalah-masalah yang dapat timbul karena kesalahan penggunaan lumpur pengeboran misalkan adalah terjadinya pipa terjepit, pengembangan lempung, hilang sirkulasi, dan bahkan dapat menimbulkan terjadinya semburan liar. Loss merupakan salah satu masalah yang sangat mengganggu dalam kegiatan pengeboran. Loss dapat ditanggulangi dengan bermacam-macam metode, diantaranya merubah berat jenis lumpur yang digunakan, mengurangi laju alir di annulus, penyumbatan menggunakan LCM, pemasangan plug semen. Penyebab terjadi loss dapat dibedakan menjadi dua jenis. Penyebab pertama karena faktor mekanis, dimana loss disebabkan oleh kesalahan-kesalahan pemilihan BHA, pemakaian lumpur yang terlalu berat, dan nilai pressure surge yang terlalu tinggi. Penyebab kedua karena faktor formasi, dimana loss disebabkan karena tekanan formasi yang relatif kecil, porositas formasi yang relatif besar, ataupun terdapat celah-celah atau retakan-retakan di dalam formasi. Kata kunci: Tekanan Hidrostatis, Kehilangan sirkulasi, LCM.
IDENTIFIKASI LAPISAN RAWAN LONGSOR MENGGUNAKAN METODE SEISMIK REFRAKSI STUDI KASUS: KAMPUS LAPANGAN LIPI KARANGSAMBUNG Bagus Adi Wibowo; Drajat Ngadmanto; Zulfiana Listyaningrum; Yoga Mahardika Kuncoro Putra
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

A research has been conducted to identificate subsurface layers on the LIPI’s Field Campus in Karangsambung, Kebumen, Java Island, Indonesia for Landslide Disaster Mitigation using Seismic Refraction Method. The data is collected using PASI 16S24-U 24 channel seismograph in a single straight line, 72 meters. In this line we laid 24 receivers with distance between each receivers about 3 meters. The P-wave arrivals data was proccessed using Hagiwara Method. From the this research we acquired informations about 2 upper subsurface layers such as P-wave velocity through each layers, the thickness of the first layer and the assumptions of layer’s materials compositions. The first layer’s velocity is about 388-899 m/s, the first layer’s thickness about 3,36 meters with the density value <1000 kg/m3.. The Second Layer’s velocity about 1663-2237 m/s with the density values about 1000-1500 kg/m3. From the velocity values, we assume that the first layer consisted by unconsolidated, having lot of pores between each grain such as soil, sand and clay, as result from the destruction of main rock structure in weathering zone. In conclusion, the first layer is considered as the landslide layer, that have opportunities to move along the second layer when the heavy rain occured. Keywords: Karangsambung, Seismic Refraction, PASI, density, Hagiwara Method, Landslide berukuran 9-poin.
PERINGATAN DINI POTENSI HUJAN ES MENGGUNAKAN METODE SEVERE HAIL INDEX BERDASARKAN PENGAMATAN RADAR CUACA DOPPLER Abdullah Ali; Sabitul Hidayati
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Hail is one of many extreme weather categories. The Indicator of hail occurrence is strong convective system of cloud. Meteorological instrument that has high temporal and spatial resolution to detect and predict hail occurrence is Doppler weather radar, and one of many methods that can be used is Severe Hail Index (SHI). SHI values is calculated based on flux values of hail kinetic energy, reflectivity, 0°C temperature profile height and -20°C temperature profile height. Hail occurrence at Jakarta 22nd of April 2014 gives SHI values 140,6 Jm-1s1, POSH (Probability of Severe Hail) 52,54%, and MEHS (Maximum Expected Hail Size) 32,9 mm, all values is calculated thirty minutes before hail occurred. Hail occurrence at Denpasar 16th of December 2010 gives SHI values 136,7 Jm-1s1, POSH (Probability of Severe Hail) 52,21%, and MEHS (Maximum Expected Hail Size) 56,6 mm, all values is calculated twenty minutes before hail occurred. Based on filed observation, POSH values is representative enough to predict hail occurrence. But there is an inappropriate between MEHS values and real condition. By using SHI method, early warning can be disseminated to reduce hail damage. Keywords : hail, Doppler weather radar, Severe Hail Index, early warning.
STUDI AWAL KARAKTERISTIK POLA RESISTIVITAS SISTEM PANAS BUMI TEMPERATUR RENDAH-MENENGAH DI INDONESIA Dadan Wildan; Syafrima Wahyu
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Electrical resistivity is a common geophysical method to identify component in geothermal system. Resitivity value is affected by porosity, fluid saturation, temperature, salinity and the most important is type/proportion of clay minerals. By using geoelectric method resistivity values obtained at low – intermediate temperature of the geothermal system oka, wai selabung, banda baru, maranda, sembalun and bonjol, for clay cap and reservoir are between 8 – 50 Ωm and 50 – 250 Ωm respectively. The low resistivity is possibly due to occurrence of smectite and chlorite which formed on temperature < 180oC with Cation Exchange Capacity (CEC) value ranging from 120 -10. Keywords: Geothermal System, resistivity, clay minerals, CEC.
ANALISA INTERAKSI SOLENOIDA DAN MEDAN MAGNET UNTUK PEMBUATAN DETEKTOR GEMPA BUMI Fryan Sopacua; Yono Hadi Pramono
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Have been fabricated earthquake detector-based interaction between the solenoid and the permanent magnetic field. The permanent magnet is chosen in such away that the direction of the vector of the magnetic field is proportional to the normal axis in the circle area. The solenoid is designed in such away that it can move inside magnetic field to produced electromotive force ( emf ) induction. The vibration which is caused by the quake will result in a change of a flux inside the solenoid consequently, a change of electric current in the solenoid. The amplitude of an electric current is proportional to the amplitude of the quake. The magnitude of current will be amplified to be readable and will be calibrated in richter scale In the future these sensors will be integrated into the monitoring system potential tsunami earthquake. Keywords: amplitude, electromotive force ( emf ) induction, magnetic field, Richter scale, solenoid.
ANALISIS SPASIAL NILAI ANOMALI MEDAN MAGNET DAERAH KARST PADA SISTEM SUNGAI BAWAH TANAH DI BRIBIN Khafidh Nur Aziz; Denny Darmawan; Nugroho Budi Wibowo
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Penelitian ini bertujuan untuk mengetahui karakteristik pola anomali medan magnet di wilayah karst pada sistem sungai bawah tanah di sekitar Sungai Bribin. Lokasi penelitian berada pada jalur sungai Bribin di Kecamatan Semanu, Kabupaten Gunungkidul pada koordinat UTM 464061 mT sampai 464929 mT dan 9111097 mU sampai 9111970 mU. Metode yang digunakan adalah metode geomagnet. Pengambilan data dalam penelitian ini menggunakan alat Proton Precession Magnetometer (PPM) tipe Geotron G5 dengan metode looping. Hasil analisis spasial terhadap pola anomali medan magnet daerah karst pada sistem sungai bawah tanah di Bribin menunjukkan bahwa nilai anomali medan magnet berkisar antara 330 nT - 530 nT. Nilai anomali medan magnet dengan kisaran antara 410 nT - 460 nT merupakan cerminan pola yang merepresentasikan sistem sungai bawah tanah. Secara spasial pola tersebut sesuai dengan pola sistem Sungai Bribin. Kata Kunci: Medan magnet, karst, bribin, analisis spasial.
PEMODELAN TIGA DIMENSI ANOMALI GRAVITASI DAN IDENTIFIKASI SESAR LOKAL DALAM PEMENTUAN JENIS SESAR DI DAERAH PACITAN Alexander Felix Taufan Parera; I Gusti Ketut Satria Bunaga; Mahmud Yusuf
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Indonesia region is one of area which have the highest vulnerability level of earthquake occurrence. Not only the mid ocean earthquakes but also the fault activities on crustal zone are very dangerous. Now, these fault activities are become special interest after the Jogja 2006 earthquake occurred. The same event occurred on February 2011 that the earthquake happened on Pacitan region with the epicenter location was around in the Grindulu fault track. Because of that, that existence is needed to study especially under the structure modelling using GRAV3D software and Second Vertical Derivative method (SVD). Study results show that two segments of the fault leads NE-SW which have normal fault pattern with slight oblique and transform fault pattern. Besides, this study results show the difference of density value in the area of the fault that have depth variation until six kilometer. Keywords: GRAV3D, Second Vertical Derivative.
PEMETAAN DAERAH PENCEMARAN ANTROPOGENIK BERBASIS SUSEPTIBILITAS MAGNETIK Estevanus Kristian Huliselan
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

The applicability of environmental magnetism methods based on the study of magnetic susceptibility (χ) have been successfully used over several decades to characterize and quantify the degree of anthropogenic pollution of different environmental systems. Moreover, in recent years, there have been a number of studies linking low frequency magnetic susceptibility (χLF) and heavy metal content in different kinds of material. Furthermore, the χLF technique can be used as a potential method to discriminate polluted and unpolluted samples. The plots of χLF versus frequency-dependent magnetic susceptibility (χFD) have been shown to be effective as discriminating tool for sources of magnetic minerals. The polluted and unpolluted samples display disparate distribution patterns of χLF and χFD. Furthermore, the pollution area can be roughly inferred. We conclude that measurement of χLF and χFD can serve as a convenient and effective method for detection of polluted and unpolluted areas. This method is promising as an alternative to conventional chemical analysis. Keywords: environmental magnetism, pollution area, anthropogenic, heavy metals, magnetic susceptibility.
ANALISA KETINGGIAN PERMUKAAN AIR LAUT BERBASIS TEKANAN ATMOSFER UNTUK SISTEM PERINGATAN DINI TSUNAMI Ledy Manuhutu; Yono Hadi Pramono
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Have analyzed sea-level atmospheric pressure using a barometer-based altitude. From the measurement results obtained that any change in the height of one meter will change the pressure 0f 0,166 millibars. It can then be applied in the tools tsunami early warning system that has been in design ("YONOHAPE"). "YONOHAPE" is a buoy system above sea level that is equipped with an optical communication device or WIFI to the mainland. This detector can measure the amplitude of tsunami waves reached the height of 150 meters. Keyword - barometer altitude, atmospheric pressure, tsunami.
EFEK SEBARAN BOSON INHOMOGEN PADA BINTANG BOSON M. Fitrah Alfian R. S.; Anto Sulaksono
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Spherically symmetric static boson stars are solutions of the system of equations of Einstein equation which is coupled to the Klein-Gordon and Proca Equation with complex scalar field with U (1) gauge symmetry. We look for the system of equations of Einstein equation which is coupled to the Klein-Gordon and Proca Equation in the curvature space then we limit the metric to the flat space. The system of equations is assumed to be inhomogeneous so, the pressure in tangential direction is different to the pressure in radialdirection that shows the anisotropic equations of state (EOS). We find numerically solutions to see the equations of state which are formed in boson stars as the consequence of inhomogeneous assumption. We also find the solutions for the case of homogeneous assumption by omitting the derivative terms of that system of equations. The result shows that with the inhomogeneous assumption, the boundary conditions can’t be fulfilled and causes the EOS unstable. For the case of homogeneous assumption, the result can describe the stable EOS of the boson stars. Keywords: boson stars, Klein-Gordon equation, Proca equation, inhomogeneous, homogeneous, EOS.

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