scholarly journals IDENTIFIKASI PATAHAN DI DESA TAMAN AYU KECAMATAN GERUNG KABUPATEN LOMBOK BARAT MENGGUNAKAN METODE GEOMAGNET

2020 ◽  
Vol 6 (2) ◽  
pp. 145-155
Author(s):  
Deni Hermansyah ◽  
Bakti Sukrisna ◽  
Suhayat Minardi
Keyword(s):  
Magnetic Field ◽  
Cross Sections ◽  
Inverse Modeling ◽  
Target Location ◽  
Continuation Method ◽  
Normal Fault ◽  
Quantitative Interpretation ◽  
Geological Structures ◽  
Qualitative Interpretation ◽  
The Magnetic Field

This research aimed to identify the presence of faults in Taman Ayu Village, Gerung District, West Lombok Regency by mapping the magnetic field. The fault outcrops found near this location becomes the reason to suspected the fault existence that reaching residents, farming area and access roads, so it is necessary to study the type, depth and direction of the fault. Measurements were made on 11 lines with a length of each line is 3 km. Each line of measurement is 300 m apart from each other and the distance between measurement points is 50 m, 100 m, and 200 m depending on the distance from the target location. Separation between regional anomalies and residual anomalies using the upward continuation method at an altitude of 1000 m. Qualitative interpretation of residual anomalies results in low anomalies with values from -890.9 nT to 897.3 nT. Quantitative interpretation of the five cross sections by the inverse modeling method with Oasis Montaj 6.4.2 software resulting subsurface geological structures in the form of normal fault. This normal fault is at a depth of 30 m to 480 m which is composed of layers of silt, sandy silt, sand, clay and breccia. The fault passes through Gapuk Village, Taman Ayu and Kebon Ayu and passes through the highway in Northeast – Southwest direction

Zero-Field Level Crossing in the Helium Atom

1972 ◽  
Vol 50 (2) ◽  
pp. 116-118 ◽  
Author(s):  
C. W. T. Chien ◽  
R. E. Bardsley ◽  
F. W. Dalby
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Helium Atom ◽  
Cross Sections ◽  
Zero Field ◽  
Level Crossing ◽  
Field Level ◽  
Collision Cross Sections ◽  
The Magnetic Field

Zero-field level-crossing techniques have been used to measure some upper-state lifetimes of the helium atom. The half-widths of curves obtained by plotting the polarization against the magnetic field strength for the n1D–21D transitions yielded lifetimes of 2.03 × 10−8 s for the 31D state, 3.36 × 10−8 s for the 41D state, and 7.44 × 10−8 s for the 51D state. Collision cross sections for these 1D levels were also determined.

scholarly journals Energy Correlations of α-Particles in the 8Be-Nucleus Ground-State Formation Channel of the 12C(γ,3α) and 16O(γ,4α) Reactions

2019 ◽  
Vol 64 (9) ◽  
pp. 787
Author(s):  
S. N. Afanasyev
Keyword(s):  
Magnetic Field ◽  
Photon Energy ◽  
Relative Motion ◽  
Cross Sections ◽  
Ground State ◽  
Diffusion Chamber ◽  
Mechanism Of Interaction ◽  
The Magnetic Field ◽  
Maximum Photon ◽  
Α Particles

The method of diffusion chamber in the magnetic field making use of a bremsstrahlung beam with a maximum photon energy of 150 MeV is applied to study the 12C(y,3a) and 16O(y,4a) reactions. A resonance identified as the ground state of 8Be nucleus is found in the distribution of events over the energy of the relative motion of two a-particles. The partial cross-sections of the 8Be nucleus formation channels are measured. It is shown that the mechanism of interaction between a y-quantum and a virtual a-particle pair takes place in this case.

scholarly journals PO-0850: MRI-Linac: Effect of the magnetic field on the interaction cross sections

2015 ◽  
Vol 115 ◽  
pp. S431 ◽  
Author(s):  
H. Szymanowski ◽  
W.Y. Baek ◽  
R. Neungang-Nganwa ◽  
H. Nettelbeck ◽  
H. Rabus
Keyword(s):  
Magnetic Field ◽  
Cross Sections ◽  
Interaction Cross Sections ◽  
The Magnetic Field

scholarly journals IMP 8 magnetosheath field comparisons with models

1998 ◽  
Vol 16 (4) ◽  
pp. 376-387 ◽  
Author(s):  
Z. Kaymaz
Keyword(s):  
Magnetic Field ◽  
Interplanetary Magnetic Field ◽  
Cross Sections ◽  
Field Vector ◽  
Cross Sectional ◽  
Vector Maps ◽  
Planetary Magnetic Fields ◽  
Magnetohydrodynamic Models ◽  
The Magnetic Field ◽  
East West

Abstract. This study presents cross-sectional vector maps of the magnetic field derived from IMP 8 magnetometer in the magnetosheath at 30 Re behind the Earth. In addition the vector patterns of the magnetosheath field for northward, southward, and east-west interplanetary magnetic field (IMF) directions are qualitatively compared with those obtained from the Spreiter-Stahara gas dynamic (GD) and Fedder-Lyon magnetohydrodynamic models (MHD). The main purpose is to display the cross-sectional differences in relation to the dayside merging with different IMF directions, allowing the reader to make direct visual comparisons of the vector patterns. It is seen that for east-west IMF directions, the data-based and MHD-based patterns differ noticeably in a similar way from the GD model, presumably reflecting the influence of dayside magnetic merging of the Earth's magnetic field with the y-component of the interplanetary magnetic field. All three northward IMF cross sections show comparable field draping patterns as expected for a closed magnetosphere. For southward IMF case, on the other hand, differences between the three cross-sectional patterns are greater as seen in the field vector sizes and directions, especially closer to the magnetopause where more disturbed magnetospheric conditions are known to be exist. The data comparisons with the MHD and GD models show that the differences result from the magnetic field-flow coupling and that the effects of dayside reconnection are present in IMP 8 magnetic field measurements.Keywords. Vector maps · IMP 8 magnetometer · Inter-planetary magnetic fields

scholarly journals ELECTROMAGNETIC-GRAVITATIONAL CONVERSION CROSS-SECTIONS IN EXTERNAL ELECTROMAGNETIC FIELDS

1994 ◽  
Vol 09 (39) ◽  
pp. 3619-3627 ◽  
Author(s):  
HOANG NGOC LONG ◽  
DANG VAN SOA ◽  
TUAN A. TRAN
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Electromagnetic Fields ◽  
Cross Sections ◽  
Differential Cross ◽  
Numerical Evaluation ◽  
Differential Cross Sections ◽  
Perturbation Techniques ◽  
External Electromagnetic Fields ◽  
The Magnetic Field

The classical processes: the conversion of photons into gravitons in the static electromagnetic fields are considered by using Feynman perturbation techniques. The differential cross-sections are presented for the conversion in the electric field of the flat condenser and the magnetic field of the solenoid. A numerical evaluation shows that the cross-sections may have the observable value in the present technical scenario.

scholarly journals A Quantum Charged Particle under Sudden Jumps of the Magnetic Field and Shape of Non-Circular Solenoids

2019 ◽  
Vol 1 (2) ◽  
pp. 193-207 ◽  
Author(s):  
Viktor V. Dodonov ◽  
Matheus B. Horovits
Keyword(s):  
Magnetic Field ◽  
Charged Particle ◽  
Magnetic Fields ◽  
Electric Fields ◽  
Cross Sections ◽  
Magnetic Moment ◽  
Landau Gauge ◽  
Time Dependent ◽  
The Mean ◽  
The Magnetic Field

We consider a quantum charged particle moving in the x y plane under the action of a time-dependent magnetic field described by means of the linear vector potential of the form A = B ( t ) − y ( 1 + β ) , x ( 1 − β ) / 2 . Such potentials with β ≠ 0 exist inside infinite solenoids with non-circular cross sections. The systems with different values of β are not equivalent for nonstationary magnetic fields or time-dependent parameters β ( t ) , due to different structures of induced electric fields. Using the approximation of the stepwise variations of parameters, we obtain explicit formulas describing the change of the mean energy and magnetic moment. The generation of squeezing with respect to the relative and guiding center coordinates is also studied. The change of magnetic moment can be twice bigger for the Landau gauge than for the circular gauge, and this change can happen without any change of the angular momentum. A strong amplification of the magnetic moment can happen even for rapidly decreasing magnetic fields.

scholarly journals Modified Adiabatic Approximation for A Hydrogen Atom Moving in A Magnetic Field

1994 ◽  
Vol 147 ◽  
pp. 555-559
Author(s):  
V.G. Bezchastnov ◽  
A.Y. Potekhin
Keyword(s):  
Magnetic Field ◽  
Hydrogen Atom ◽  
Magnetic Fields ◽  
Density Distribution ◽  
Cross Sections ◽  
Electron Density Distribution ◽  
Adiabatic Approximation ◽  
Strong Magnetic Fields ◽  
Radiative Transitions ◽  
The Magnetic Field

AbstractMotion of a hydrogen atom across the magnetic field shifts center of electron density distribution. For strong magnetic fields, the radiative transitions can be considered in the modified adiabatic approximation in which the shifts are taken into account. The method is illustrated by calculating the photoionization cross sections.

Thermomagnetic Force for Small Spheroidal Particles

1974 ◽  
Vol 29 (9) ◽  
pp. 1253-1257 ◽  
Author(s):  
H. Vestner ◽  
T. W. Adair
Keyword(s):  
Magnetic Field ◽  
Temperature Gradient ◽  
Field Strength ◽  
Surface Area ◽  
Magnetic Field Strength ◽  
Cross Sections ◽  
Gas Pressure ◽  
Relative Sign ◽  
Effect Data ◽  
The Magnetic Field

The thermomagnetic force for small spheroidal particles is given in the Waldmann limit. In this limit the force is proportional to the surface area of the particle, and depends on the gas pressure p and on the magnetic field strength H only via H/p. For the gases HD, CH4, CO and N2 the ratio of the thermomagnetic and thermal forces is calculated from Senftleben-Beenakker effect data. It is pointed out that the sign and magnitude of the thermomagnetic force in the Waldmann limit give information on the relative sign of two non-diagonal collision cross sections. The dependence of the force on the orientations of the magnetic field and of the axis of the particle relative to the temperature gradient is discussed.

scholarly journals Identifikasi Jalur Sesar Opak Berdasarkan Analisis Data Anomali Medan Magnet dan Geologi Regional Yogyakarta

2017 ◽  
Vol 4 (02) ◽  
pp. 192
Author(s):  
Ira Maya Fathonah ◽  
Nugroho Budi Wibowo ◽  
Yoshaphat Sumardi
Keyword(s):  
Magnetic Field ◽  
Surface Structure ◽  
Normal Fault ◽  
Magnetic Method ◽  
The West ◽  
Geomagnetic Data ◽  
Anomaly Pattern ◽  
Anomaly Analysis ◽  
Result Interpretation ◽  
The Magnetic Field

<p>This research was aimed to know the magnetic field anomaly pattern upon Opak’s fault, to identify the direction of Opak’s fault and the structure of Opak’s fault based on Geomagnetic data. It was conducted in the vicinity of Opak’s fault in Pundong sub-district, Yogyakarta. It used magnetic method which is based on rocks magnetic susceptibility. The data were taken by G-856AX Proton Precision Magnetometer (PPM) using looping method. Data analysis was done using diurnal variation and IGRF correction, reduction to pole, upward continuation and under surface structure modelling. From magnetic field anomaly analysis, it was discovered that magnetic field anomaly on Opak’s fault has -50 nT negative closure in the East, and 100 nT positive closure in the West. According to the result interpretation of 2.5D model on two slices using Mag2DC software, it can be obtained that the under surface structure of Opak’s fault consist of Young Alluvial formation, Nglanggran formation, Semilir formation, Kebo Butak formation, and Wungkal Gamping with various thickness. The location of this Opak’s fault is almost the same with the location of Opak’s fault in Yogyakarta geology map. Opak’s fault around Pundong sub-district is a normal fault directed to N 35º E. The eastern part of the fault has a relatively constant movement, while the western part is relatively moving down.</p>

OPTICAL PROPERTIES OF ACCEPTORS IN SEMIMAGNETIC QUANTUM WELL SYSTEMS

2002 ◽  
Vol 16 (25) ◽  
pp. 3737-3757 ◽  
Author(s):  
Sr. GERARDIN JAYAM ◽  
K. NAVANEETHAKRISHNAN
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Quantum Well ◽  
Cross Sections ◽  
Empirical Relationship ◽  
Phonon Interaction ◽  
Shallow Acceptor ◽  
Electron Phonon Interaction ◽  
The Magnetic Field ◽  
Confined Phonons

The binding energy of a shallow acceptor in an isolated quantum well of the CdTe / Cd 1-x Mn x Te system has been investigated in an external magnetic field, assuming an empirical relationship between the barrier height and the magnetic field. Photoionization cross-sections for different magnetic fields have been estimated. Taking into account the confined phonons in the electron-phonon interaction, carrier capture times for various magnetic fields and different hydrostatic pressures have been computed. The results obtained are discussed in the light of the existing literature.

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