Broad-band VSP data acquisition and analysis in complex structure area

2016 ◽  
Author(s):  
Cai Zhidong* ◽  
Guo Mingjie ◽  
Zhang Kun ◽  
Wang Yang ◽  
Wang Yanhua
Keyword(s):  
Data Acquisition ◽  
Complex Structure ◽  
Broad Band ◽  
Vsp Data

scholarly journals Stellar Populations in M31 from Broad-band Photometry

2010 ◽  
Vol 6 (S277) ◽  
pp. 199-202
Author(s):  
Antti Tamm ◽  
Elmo Tempel ◽  
Peeter Tenjes ◽  
Taavi Tuvikene
Keyword(s):  
Complex Structure ◽  
Broad Band ◽  
Far Infrared ◽  
Stellar Populations ◽  
Sloan Digital Sky Survey ◽  
Spectral Energy ◽  
3 Dimensional ◽  
Sky Survey ◽  
The Galaxy ◽  
M 31

AbstractDue to its proximity, size, complex structure and high inclination angle, M31 offers an excellent opportunity for studying galactic structures outside the Milky Way and for drawing implications for their cosmological origin. We have studied the stellar populations of M 31 using the Sloan Digital Sky Survey (SDSS) photometry and the Spitzer far-infrared (FIR) mappings of dust. Combining these data, we have constructed a 3-dimensional model of the galaxy, laying constraints on the intrinsic (dust-free) properties of the galaxy and its stellar populations: their apparent and intrinsic luminosities, luminosity distributions, colours, shapes and sizes. We have interpreted the derived spectral energy distributions with synthetic stellar populations created with the Starburst99 software, in order to constrain the ages and masses of the stellar components.

scholarly journals Data acquisition and control system for broad-band microwave reflectometry on EAST

2014 ◽  
Author(s):  
Fei Wen ◽  
Tao Zhang ◽  
Shoubiao Zhang ◽  
Defeng Kong ◽  
Yuming Wang ◽  
...  
Keyword(s):  
Control System ◽  
Data Acquisition ◽  
Broad Band ◽  
And Control

Borehole stresses created by downhole seismic sources

Geophysics ◽  
1991 ◽  
Vol 56 (7) ◽  
pp. 1055-1057 ◽  
Author(s):  
G. A. Winbow
Keyword(s):  
Shear Stress ◽  
Data Acquisition ◽  
Hoop Stress ◽  
Seismic Sources ◽  
Vsp Data ◽  
Acoustic Sources

This paper analyzes the stresses created by downhole acoustic sources used for crosshole or reverse VSP data acquisition. The pressures created by downhole sources may be as large as [Formula: see text] bars which cannot affect intact steel casing. However, such pressures might in principle either (A) crack the cement radially through excessive hoop stress [Formula: see text], or (B) loosen the cement from the casing through an excessive value of shear stress [Formula: see text].

Borehole-Driven 3D Surface Seismic Data Processing Using DAS-VSP Data

2021 ◽  
Author(s):  
Gang Yu ◽  
Junjun Wu ◽  
Yuanzhong Chen ◽  
Ximing Wang
Keyword(s):  
Data Processing ◽  
Data Acquisition ◽  
Seismic Data ◽  
Field Data ◽  
Seismic Data Processing ◽  
3D Surface ◽  
Data Volume ◽  
Vsp Data ◽  
Seismic Data Acquisition ◽  
Anisotropy Parameters

Abstract A 3D surface seismic data acquisition project was conducted simultaneously with 3D DAS-VSP data acquisition in one well in Jilin Oilfield of Northen China. The 3D surface seismic data acquisition project covered an area of 75 km2, and one borehole (DS32-3) and an armoured optical cable with high temperature single mode fiber were used to acquire the 3D DAS-VSP data simultaneously when the crew was acquiring the 3D surface seismic data. The simultaneously acquired 3D DAS-VSP data were used to extract formation velocity, deconvolution operator, absorption, attenuation (Q value), anisotropy parameters (η, δ, ε) as wel as enhanced the surface seismic data processing including velocity model calibration and modification, static correction, deconvolution, demultiple processing, high frequency restoration, anisotropic migration, and Q-compensation or Q-migration. In this project, anisotropic migration, Q-migration was conducted with the anisotropy parameters (η, δ, ε) data volume and enhanced Q-field data volume obtained from the joint inversion of both the near surface 3D Q-field data volume from uphole data and the mid-deep layer Q-field data volume from all available VSP data in the 3D surface seismic surveey area. The anosotropic migration and Q-migration results show much sharper and focussed faults and and clearer subsutface structure.

scholarly journals Control and Diagnostics System Generator for Complex FPGA-Based Measurement Systems

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7378
Author(s):  
Wojciech M. Zabołotny ◽  
Marek Gumiński ◽  
Michał Kruszewski ◽  
Walter F.J. Müller
Keyword(s):  
Data Acquisition ◽  
High Speed ◽  
High Energy Physics ◽  
Complex Structure ◽  
High Energy ◽  
Tight Coupling ◽  
Multichannel Measurement ◽  
Automated Generation ◽  
Measurement Systems ◽  
Diagnostics System

FPGA-based data acquisition and processing systems play an important role in modern high-speed, multichannel measurement systems, especially in High-Energy and Plasma Physics. Such FPGA-based systems require an extended control and diagnostics part corresponding to the complexity of the controlled system. Managing the complex structure of registers while keeping the tight coupling between hardware and software is a tedious and potentially error-prone process. Various existing solutions aimed at helping that task do not perfectly match all specific requirements of that application area. The paper presents a new solution based on the XML system description, facilitating the automated generation of the control system’s HDL code and software components and enabling easy integration with the control software. The emphasis is put on reusability, ease of maintenance in the case of system modification, easy detection of mistakes, and the possibility of use in modern FPGAs. The presented system has been successfully used in data acquisition and preprocessing projects in high-energy physics experiments. It enables easy creation and modification of the control system definition and convenient access to the control and diagnostic blocks. The presented system is an open-source solution and may be adopted by the user for particular needs.

Magmatic fluid pathways in the upper crust: insights from dense magnetotelluric observations around the Kuju Volcanoes, Japan

2021 ◽  
Vol 228 (2) ◽  
pp. 755-772
Author(s):  
Koki Aizawa ◽  
Mitsuru Utsugi ◽  
Keigo Kitamura ◽  
Takao Koyama ◽  
Makoto Uyeshima ◽  
...  
Keyword(s):  
Fluid Transport ◽  
Complex Structure ◽  
Broad Band ◽  
Active Faults ◽  
Low Frequency ◽  
High Strength ◽  
Volcanic Eruptions ◽  
Magmatic Fluid ◽  
Resistivity Structure ◽  
The North

SUMMARY Magnetotelluric (MT) observations have revealed subvertical electrical conductors that extend from shallow depths into the mid-crust at various geothermal zones, active volcanoes and active faults worldwide. These deeply rooted subvertical conductors have typically been interpreted to represent entire zones of dedicated fluid transport through the crust. We estimate the high-resolution 3-D crustal resistivity structure below the Kuju Volcanoes, Japan, using dense observations from 153 broad-band MT measurement sites and 40 telluric measurement sites. The resistivity structure highlights subvertical conductors that merge into a deep conductor to the north of the volcanoes, with deep low-frequency earthquakes occurring near the southeastern edge of this subvertical conductor at 10–30 km depth. This deep conductor branches into several subvertical conductors at 2–10 km depth, coinciding with a shallow zone where tectonic earthquakes rarely occur. The surface expressions of active geothermal areas and past volcanic eruptions are all located above the edges of the conductors at 2–6 km depth. Widespread conductive layers exist around the volcanoes above 2 km depth, and their distribution approximately corresponds to a low-gravity-anomaly zone. We discuss the nature of these subvertical conductors, the potential causes of their complex structure and their relationship to local magmatic fluid transport. These subvertical conductors, a shallow clay-rich layer, developed fracture systems and high-strength solidified magma may all contribute to magmatic fluid transport to the surface at the Kuju Volcanoes. In this study, we add the possibility that the edges of these subvertical conductors act as important magmatic fluid pathways.

An infrared spectroscopic study of hydrogen feldspar (HA1Si3O8)

1995 ◽  
Vol 59 (394) ◽  
pp. 15-24 ◽  
Author(s):  
H. Behrens ◽  
G. Müller
Keyword(s):  
Amorphous Phase ◽  
Near Infrared ◽  
Complex Structure ◽  
Broad Band ◽  
Molecular Water ◽  
Hydroxyl Groups ◽  
Infrared Spectroscopic Study ◽  
Absorption Bands ◽  
Two Phases ◽  
Middle Infrared

AbstractHydrogen in H-feldspar obtained by ion-exchange was studied in the spectral range 1000–5500 cm−1 by single crystal IR microspectroscopy. Spectra were almost identical for H-feldspars prepared either from sanidine or from adularia. Two bands in the middle-infrared were identified by D/H exchange as OH vibration modes. One broad band with a maximum at 3000 cm−1 and shoulders at 2800, 3200 and 3500 cm−1 confirms previous work. An additional OH absorption band with a maximum at 2485 cm−1 was observed for the first time in feldspars. The pleochroism of the OH absorption bands suggests that the H-feldspar is composed of two phases, an amorphous phase and a feldspathic phase. The proportion of the amorphous phase is increased by heating, producing a shift of the maximum of the band at 3000 cm−1 towards higher wavenumber and a decrease of the intensity of the band at 2485 cm−1. Near-infrared spectroscopy showed that hydrogen is present as hydroxyl groups bound to tetrahedral cations in both phases. Molecular water was not detected. The experimental results imply that hydrogen is incorporated in the H-feldspars as protons attached to bridging oxygen as well as to non-bridging oxygen. The complex structure of the IR spectra implies that the protons are distributed over a large number of sites in the cation cavity of the feldspars.

scholarly journals Control and Diagnostics System Generator for Complex FPGA-based Measurement Systems

2021 ◽  
Author(s):  
Wojciech Marek Zabołotny ◽  
Marek Gumiński ◽  
Michał Kruszewski ◽  
Walter F.J. Müller
Keyword(s):  
Control System ◽  
Data Acquisition ◽  
High Speed ◽  
High Energy Physics ◽  
Complex Structure ◽  
High Energy ◽  
Tight Coupling ◽  
Multichannel Measurement ◽  
Measurement Systems ◽  
Diagnostics System

FPGA-based data acquisition and processing systems play an important role in modern high-speed, multichannel measurement systems, especially in High-Energy and Plasma Physics. Such FPGA-based systems require an extended control and diagnostics part corresponding to the complexity of the controlled system. Managing the complex structure of registers while keeping the tight coupling between hardware and software is a tedious and potentially error-prone process. Various existing solutions aimed at helping that task do not perfectly match all specific requirements of that application area. The paper presents a new solution based on the XML system description, facilitating the automated generation of the control system’s HDL code and software components and enabling easy integration with the control software. The emphasis is put on reusability, ease of maintenance in case of system modification, easy detection of mistakes, and the possibility of use in modern FPGAs. The presented system has been successfully used in data acquisition and preprocessing projects in High-Energy Physics experiments. It enables easy creation and modification of the control system definition and convenient access to the control and diagnostic blocks. The presented system is an open-source solution and may be adopted by the user for particular needs.

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