scholarly journals PARAMETER-PARAMETER FISIKA UNTUK MENGUNGKAP STRUKTUR STATIS BAWAH PERMUKAAN GUNUNGAPI

2021 ◽  
Vol 7 (1) ◽  
pp. 181
Author(s):  
Syahrial Ayub ◽  
Muhammad Zuhdi ◽  
Muhammad Taufik
Keyword(s):  
Radiation Power ◽  
Mass Density ◽  
Volcanic Tremor ◽  
Physical Parameters ◽  
Volcanic Earthquake ◽  
Positive Anomaly ◽  
Static Structure ◽  
Pipe System ◽  
Gravity And Magnetic ◽  
Fluid Magma

ABSTRAKParameter-parameter fisika gunungapi diungkap dengan metode geofisika. Survei kakas gravitasi dan magnetik  yang menghasilkan anomali positive bagi medan gravitasi dan magnetiknya, mengungkap struktur statis bawah permukaannya. Analisis tremor volkanik mengungkap dinamika internalnya. Gerakan-gerakan (aliran) fluida magma di dalam gunungapi menjadi sumber getar yang memancarkan gelombang seismik yang di sebut tremor volkanik. Lokasi, migrasi, daya pancar, bentuk geometri sistem pipa-kantong magma, periodisasi, model matematis dan sebagainya. Gempa volkanik yang disebabkan aktivitas magma dapat dijadikan indikator. Hasil pengeplotan posisi hiposenter dan episenter terhadap gempa volkanik yang terjadi, juga dapat mengungkap struktur statis bawah permukaan gunungapi. Kata Kunci : parameter-parameter fisika gunungapi; struktur statis bawah permukaanbawah permukaan ABSTRACTUsing methods of geophysics, physical parameters of volcano are described. Gravity and magnetic surveys yield positive anomaly on their fields, which can be interpreted as an accumulated material beneath the surface with certain values of its mass density and magnetic susceptibility. Analysis of volcanic tremor at the volcano to the knowledge of its internal dynamics. Fluid magma movements inside a volcano acts as source of vibrations which radiate sesmic wave called volcanic tremor. Location, migration, radiation power, geometry of magma chamber-pipe system, periodicities, mathematical models, etc. Volcanic earthquakes caused by magma activity can also be used as indicators. The results of the hypocenter and epicenter position of the volcanic earthquake that occurred, can also reveal the subsurface static structure of the volcano. Keywords : physical parameters;subsurface static structure

Flexural Vibration Band Gaps in a Ternary Phononic Crystal Thin Plate

2011 ◽  
Vol 675-677 ◽  
pp. 1085-1088
Author(s):  
Zong Jian Yao ◽  
Gui Lan Yu ◽  
Jian Bao Li
Keyword(s):  
Band Gap ◽  
Thin Plate ◽  
Mass Density ◽  
Phononic Crystal ◽  
Flexural Vibration ◽  
Expansion Method ◽  
Band Gaps ◽  
Physical Parameters ◽  
Vibration Band ◽  
Filling Fraction

The band structures of flexural waves in a ternary locally resonant phononic crystal thin plate are studied using the improved plane wave expansion method. And the thin concrete plate composed of a square array of steel cylinders hemmed around by rubber is considered here. Absolute band gaps of flexural vibration with low frequency are shown. The calculation results show that the band gap width is strongly dependent on the filling fraction, the radius ratio, the mass density and the Young’s modulus contrasts between the core and the coating. So by changing these physical parameters, the required band gap could be obtained.

scholarly journals Crustal structure of Guadeloupe islands and the Lesser Antilles arc from a new gravity and magnetic synthesis

2013 ◽  
Vol 184 (1-2) ◽  
pp. 77-97 ◽  
Author(s):  
Lydie-Sarah Gailler ◽  
Guillaume Martelet ◽  
Isabelle Thinon ◽  
Vincent Bouchot ◽  
Jean-Frédéric Lebrun ◽  
...  
Keyword(s):  
Lesser Antilles ◽  
Magnetic Data ◽  
Deformation Model ◽  
Positive Anomaly ◽  
The North ◽  
Gravity And Magnetic ◽  
Marine Gravity ◽  
Half Graben ◽  
Geophysical Anomalies ◽  
Lesser Antilles Arc

Abstract Guadeloupe island (West French Indies) is one of the twenty islands that compose the Lesser Antilles arc, which results from the subduction of the Atlantic ocean plate beneath the Caribbean one. The island lies in a complex volcano-tectonic system and the need to understand its geological context has led to numerous on- and offshore geophysical investigations. This work presents a compilation and the processing of available, on-land, airborne and marine, gravity and magnetic data acquired during the last 40 years on Guadeloupe islands and at the scale of the Lesser Antilles arc. The overall dataset provides new Bouguer and reduced to the pole magnetic anomaly maps at the highest achievable resolution. Regionally, the main central negative gravity trend of the arc allows defining two subsident areas. The first one is parallel to the arc direction (~N160°E) to the north, whereas the second unexpected southern one is oriented parallel to oceanic ridges (N130°E). Along the Outer arc, the long wavelength positive anomaly is interpreted, at least along the Karukera spur, as an up-rise of the volcanic basement in agreement with the seismic studies. To the NE of Guadeloupe, the detailed analysis of the geophysical anomalies outlines a series of structural discontinuities consistent with the main bathymetric morphologies, and in continuity of the main fault systems already reported in this area. Based on geophysical evidences, this large scale deformation and faulting of the Outer arc presumably primarily affects the Atlantic subducting plate and secondarily deforms the upper Caribbean plate and the accretion prism, as evidenced in bathymetry as well as on the islands. At the scale of Guadeloupe island, combined gravity and magnetic modeling has been initiated based on existing interpretation of old seismic refraction profiles, with a general structure in three main layers. According to our geophysical anomalies, additional local structures are also modeled in agreement with geological observations: i) the gravity and magnetic signals confirm an up-rise of the volcanic basement below the limestone platforms outcropping on Grande-Terre island ; ii) the ancient volcanic complexes of Basse-Terre island are modeled with high density and reverse magnetized formations; iii) the recent volcanic centre is associated with formations consistent with the low measured density and the underlying hydrothermal system. The E-W models coherently image a NNW-SSE depression structure in half-graben beneath Basse-Terre island, its western scarp following the arc direction in agreement with bathymetric and seismic studies to the north of the island. The so-defined depressed area, and particularly its opening in half-graben toward the SW, is interpreted as the present-day front of deformation of the upper plate, associated with the recent volcanic activity on and around Guadeloupe. Based on this regional deformation model, perspectives are given for further integrated investigation of key targets to address the internal structure and evolution of the Lesser Antilles arc and Guadeloupe volcanic system.

scholarly journals ТАХІОННА ЕНЕРГІЯ В КВАНТОВО-ГРАВІТАЦІЙНОМУ ВІДОБРАЖЕННІ

2018 ◽  
pp. 18-23
Author(s):  
Николай Григорьевич Толмачев ◽  
Виктор Иванович Рябков
Keyword(s):  
Mass Density ◽  
Classical Mechanics ◽  
Normal Pressure ◽  
Physical Parameters ◽  
Boltzmann Constant ◽  
Speed Of Light ◽  
Quantum Energy ◽  
Transmission Rates ◽  
Energy Models ◽  
Kinetic And Potential Energies

The article presents a mapping of tachyon energy in the form of quantum-energy interaction of baryon and tachyon quanta on the basis of the quantum-gravitational approach. A baryon quantum means a portion of the already known baryonic substance with the interaction transmission rates equal to or less than the speed of light, and under a tachyon quantum means a portion of a previously not observed substance – the "dark" mass with interaction rates greater than the speed of light. On the basis of such assumptions, and also with the use of the basic laws of classical mechanics and the first two principles of thermodynamics, quantum-energy models have been developed in the work that allowed all the physical parameters of micro- and nanoparticles, such as masses, densities and temperatures, interaction transmission rates etc. to be represented in a form of their energy equivalents: Екб, Епб, Ект, Епт, ΔЕб and ΔЕт. With the help of such models it has been established the following:– the tachyon quantum actually possesses all the signs of matter, that is, it has mass, density, and all other physical parameters;– regarding the energy properties, that is, the kinetic and potential energies, the tachyon quantum exceeds the baryonic quantum by about 70 ± 100 orders of magnitude, that is, it has colossal energy, which is usually called as tachyon energy.The proof of the proper use of quantum-energy models for estimating the parameters of tachyon energy carriers in this paper was done in the way of comparing the values of known physical constants (normal pressure, normal temperature, normal molar volume, Loschmidt number, Boltzmann constant, Stefan-Boltzmann constant and universal gas constant) with their numerical values, obtained experimentally by different researchers at different times.This opens up opportunities for a comprehensive study of the properties and particles of the "dark" mass and its energy capabilities.

scholarly journals Features of measurements the IR radiation power of a laser diode used in active optoelectronic systems for studying flows

2021 ◽  
Vol 2127 (1) ◽  
pp. 012047
Author(s):  
V V Bliznyuk ◽  
V A Parshin ◽  
N S Savinov ◽  
A A Selivanov ◽  
A E Tarasov
Keyword(s):  
Laser Radiation ◽  
Heat Flow ◽  
Radiation Power ◽  
Laser Diodes ◽  
Physical Parameters ◽  
Electronic Systems ◽  
Ir Radiation ◽  
Controlled Source ◽  
Ir Laser ◽  
Thermal Physical Parameters

Abstract In active optical-electronic systems for stream research that regulate thermal-physical parameters of diagnosed stream volume, the controlled source of the heat flow can be acquired by radiation of high-power IR laser diodes into the void. In the current work the peculiarities of measurement of this radiation are considered, specified by its strong divergence. It is shown that the measurements can involve laser wattmeters IMO-4M with planar thermoelectric primary measuring transformers of the laser radiation with a flat receiving site provided.

Joint gravity and magnetic inversion in 3D using Monte Carlo methods

Geophysics ◽  
2006 ◽  
Vol 71 (4) ◽  
pp. G153-G156 ◽  
Author(s):  
Miguel Bosch ◽  
Ronny Meza ◽  
Rosa Jiménez ◽  
Alfredo Hönig
Keyword(s):  
Monte Carlo ◽  
Magnetic Susceptibility ◽  
Prior Information ◽  
3D Model ◽  
Mass Density ◽  
Magnetic Data ◽  
Gravity And Magnetic ◽  
Magnetic Inversion ◽  
Gravity And Magnetic Data ◽  
Model Layer

We jointly invert gravity and magnetic data following a Monte Carlo method that provides estimation for a 3D model of the structure and physical properties of the medium. In particular, the model layer geometry and the density and magnetic susceptibility fields within layers are estimated, and their uncertainties are described with posterior probabilities. This method combines the gravity and magnetic data with prior information of the mass density and magnetic susceptibility statistics, and statistical constraints on the model interface positions. The resulting model realizations jointly comply with the observations and the prior statistical information.

scholarly journals Correlative all-optical quantification of mass density and mechanics of sub-cellular compartments with fluorescence specificity

eLife ◽  
2022 ◽  
Vol 11 ◽  
Author(s):  
Raimund Schlüßler ◽  
Kyoohyun Kim ◽  
Martin Nötzel ◽  
Anna Taubenberger ◽  
Shada Abuhattum ◽  
...  
Keyword(s):  
Mass Density ◽  
Optical Diffraction ◽  
Physical Parameters ◽  
Implicit Assumption ◽  
Optical Diffraction Tomography ◽  
Quantitative Measurements ◽  
All Optical ◽  
Novel Method ◽  
Cellular Compartments ◽  
Longitudinal Modulus

Quantitative measurements of physical parameters become increasingly important for understanding biological processes. Brillouin microscopy (BM) has recently emerged as one technique providing the 3D distribution of viscoelastic properties inside biological samples - so far relying on the implicit assumption that refractive index (RI) and density can be neglected. Here, we present a novel method (FOB microscopy) combining BM with optical diffraction tomography and epi-fluorescence imaging for explicitly measuring the Brillouin shift, RI and absolute density with specificity to fluorescently labeled structures. We show that neglecting the RI and density might lead to erroneous conclusions. Investigating the nucleoplasm of wild-type HeLa cells, we find that it has lower density but higher longitudinal modulus than the cytoplasm. Thus, the longitudinal modulus is not merely sensitive to the water content of the sample - a postulate vividly discussed in the field. We demonstrate the further utility of FOB on various biological systems including adipocytes and intracellular membraneless compartments. FOB microscopy can provide unexpected scientific discoveries and shed quantitative light on processes such as phase separation and transition inside living cells.

scholarly journals Inversion Technique of Physical Parameters Based on Regularization Extension Depth Constraint

2019 ◽  
Vol 23 (4) ◽  
pp. 331-338
Author(s):  
Yang Wang ◽  
Jun Li ◽  
Xuben Wang ◽  
Xingxiang Jian
Keyword(s):  
Physical Property ◽  
Magnetic Anomalies ◽  
Downward Continuation ◽  
Resolving Power ◽  
Depth Of Field ◽  
Inversion Method ◽  
Physical Parameters ◽  
Field Source ◽  
Gravity And Magnetic ◽  
Downward Continuation Of Gravity

Through the regularization downward continuation of gravity and magnetic anomalies, the depth of the field source can be solved. However, due to the Gibbs effect, the horizontal resolving power of the field source is poor. In view of this, based on the depth of field source established by regularization downward continuation, this paper proposes a physical property parameter inversion method based on iterative continuation and anomaly separation, which can effectively improve the inversion accuracy of superimposed anomaly physical parameters, and provide a new idea for solving the physical parameters of superposition gravity and magnetic anomalies.

A Comparison Between the Use of Physical Parameters and Correction Factors in Dynamic Model Updating

1995 ◽  
Author(s):  
Walter D’Ambrogio ◽  
Annalisa Fregolent
Keyword(s):  
Elasticity Modulus ◽  
Model Updating ◽  
Mass Density ◽  
Physical Parameters ◽  
Test Case ◽  
Correction Factors ◽  
Scale Factors ◽  
Updating Procedure ◽  
Geometrical Dimensions ◽  
Selection Of

Abstract The selection of quantities and/or variables that have to be corrected during the updating process is addressed in this paper. Among quantities, the major alternative is the choice between correction factors and physical parameters. The former represent scale factors used to adjust mass and stiffness submatrices of the analytical model, while the latter include parameters such as the elasticity modulus, mass density, geometrical dimensions, etc. Advantages and limitations in the process of updating physical parameters instead of correction factors are highlighted: it can be shown that only a limited number of physical parameters can be simultaneously updated for each element. The two approaches are compared using a previously developed updating procedure to solve an experimental test case.

scholarly journals Transient Effects in Atmosphere and Ionosphere Preceding the 2015 M7.8 and M7.3 Gorkha–Nepal Earthquakes

2021 ◽  
Vol 9 ◽  
Author(s):  
Dimitar Ouzounov ◽  
Sergey Pulinets ◽  
Dmitry Davidenko ◽  
Alexandr Rozhnoi ◽  
Maria Solovieva ◽  
...  
Keyword(s):  
Chemical Potential ◽  
Time Lag ◽  
Low Frequency ◽  
Longwave Radiation ◽  
Abnormal Behavior ◽  
Physical Parameters ◽  
Positive Anomaly ◽  
Transient Effects ◽  
Large Area ◽  
Gps Tec

We analyze retrospectively/prospectively the transient variations of six different physical parameters in the atmosphere/ionosphere during the M7.8 and M7.3 earthquakes in Nepal, namely: 1) outgoing longwave radiation (OLR) at the top of the atmosphere (TOA); 2) GPS/TEC; 3) the very-low-frequency (VLF/LF) signals at the receiving stations in Bishkek (Kyrgyzstan) and Varanasi (India); 4) Radon observations; 5) Atmospheric chemical potential from assimilation models; and; 6) Air Temperature from NOAA ground stations. We found that in mid-March 2015, there was a rapid increase in the radiation from the atmosphere observed by satellites. This anomaly was located close to the future M7.8 epicenter and reached a maximum on April 21–22. The GPS/TEC data analysis indicated an increase and variation in electron density, reaching a maximum value during April 22–24. A strong negative TEC anomaly in the crest of EIA (Equatorial Ionospheric Anomaly) occurred on April 21, and a strong positive anomaly was recorded on April 24, 2015. The behavior of VLF-LF waves along NWC-Bishkek and JJY-Varanasi paths has shown abnormal behavior during April 21–23, several days before the first, stronger earthquake. Our continuous satellite OLR analysis revealed this new strong anomaly on May 3, which was why we anticipated another major event in the area. On May 12, 2015, an M7.3 earthquake occurred. Our results show coherence between the appearance of these pre-earthquake transient’s effects in the atmosphere and ionosphere (with a short time-lag, from hours up to a few days) and the occurrence of the 2015 M7.8 and M7.3 events. The spatial characteristics of the pre-earthquake anomalies were associated with a large area but inside the preparation region estimated by Dobrovolsky-Bowman. The pre-earthquake nature of the signals in the atmosphere and ionosphere was revealed by simultaneous analysis of satellite, GPS/TEC, and VLF/LF and suggest that they follow a general temporal-spatial evolution pattern that has been seen in other large earthquakes worldwide.

Characterization of Single Platelet Mass, Volume, and Density in Response to Agonist Stimulation

Blood ◽  
2011 ◽  
Vol 118 (21) ◽  
pp. 5261-5261 ◽  
Author(s):  
Kristina M. Haley ◽  
Cassandra P. Loren ◽  
Kevin G. Phillips ◽  
Owen J.T. McCarty
Keyword(s):  
Refractive Index ◽  
Single Cell ◽  
Platelet Activation ◽  
Mass Density ◽  
Dry Mass ◽  
Physical Parameters ◽  
Platelet Volume ◽  
Mass Volume ◽  
Platelet Mass

Abstract Abstract 5261 An increase in mean platelet volume (MPV) is correlated with platelet activation and subsequent shape change. Pathologic processes marked by increased platelet activity such as myocardial infarction, cerebral vascular accidents, diabetes mellitus, and hypertension are associated with an increased MPV. Elevated MPV in these conditions reflect both a higher level of platelet activation as well as increased platelet turnover secondary to platelet consumption within thrombus formation. Assessment of MPV can be used to risk stratify patients as well as assign them to prognostic categories. However, MPV does not assess platelet heterogeneity or the specific change in single platelet mass, volume, or density. Current methods provide little insight into changes in physical parameters at the single platelet level. In order to overcome this limitation, we developed a quantitative tomographic differential interference contrast (QTDIC) microscopy technique to measure dry mass, volume, and density of platelets at the single-cell level. This technique is based on determining the axially resolved refractive index from a series of through-focus DIC images. Single cell platelet mass was observed to reduce from 1.84 ± 0.14 pg to 1.60 ± 0.13 pg in response to stimulation with thrombin-receptor agonist peptide (TRAP), while single cell platelet volume reduced from 7.28 ± 0.56 fL to 6.03 ± 0.48 fL (mean ± SEM). Single cell platelet density increased from 0.25 ± 0.001 pg/fL to 0.26 ± 0.002 pg/fL (mean ± SEM). Taken together, we have characterized the physical parameters of platelets in response to agonist stimulation. Our data suggest that platelet activation may correlate with decreased mass and volume, perhaps as a consequence of platelet degranulation. Further elucidation of the morphological changes of activated platelets at the single platelet level may allow for better understanding of platelet function and dysfunction in patients affected by platelet granule deficiencies, giant platelet syndromes, and disorders associated with membrane receptorsFigure 1.Characterization of physical parameters of platelets. (a) DIC image of human platelets, (b) refractive index map, (c) dry mass density map determined from refractive index using the Barer calibration, (d) Histogram of platelet dry mass, (e) Histogram of platelet volume, (f) Histogram of platelet density.Figure 1. Characterization of physical parameters of platelets. (a) DIC image of human platelets, (b) refractive index map, (c) dry mass density map determined from refractive index using the Barer calibration, (d) Histogram of platelet dry mass, (e) Histogram of platelet volume, (f) Histogram of platelet density. Disclosures: No relevant conflicts of interest to declare.

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