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Статті в журналах з теми "INVERSION-COMPRESSION METHOD"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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1

Li, Shouju, De Li, Lijuan Cao, and Zichang Shangguan. "Parameter estimation approach for particle flow model of rockfill materials using response surface method." International Journal of Computational Materials Science and Engineering 04, no. 01 (2015): 1550003. http://dx.doi.org/10.1142/s2047684115500037.

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Анотація:

Particle flow code (PFC) is widely used to model deformation and stress states of rockfill materials. The accuracy of numerical modeling with PFC is dependent upon the model parameter values. How to accurately determine model parameters remains one of the main challenges. In order to determine model parameters of particle flow model of rockfill materials, some triaxial compression experiments are performed, and the inversion procedure of model parameters based on response surface method is proposed. Parameters of particle flow model of rockfill materials are determined according to the observe

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2

Chen, Dai Heng, and Lu Yang. "Inversion Behavior for Cylindrical Tubes under Axial Compression." Advanced Materials Research 430-432 (January 2012): 512–16. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.512.

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This paper presents an analysis of tube inversion under axial compression by a finite element method with the aim of expressing and calculating the axial stress from the stress equilibrium equation. The state of a cylinder under internal stress and the inversion transformation mechanism are then clarified, and verification of the proposed theoretical model is examined.

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3

Habashy, T. M., A. Abubakar, G. Pan, and A. Belani. "Source-receiver compression scheme for full-waveform seismic inversion." GEOPHYSICS 76, no. 4 (2011): R95—R108. http://dx.doi.org/10.1190/1.3590213.

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We have developed a source-receiver compression approach for reducing the computational time and memory usage of the acoustic and elastic full-waveform inversions. By detecting and quantifying the extent of redundancy in the data, we assembled a reduced set of simultaneous sources and receivers that are weighted sums of the physical sources and receivers used in the survey. Because the numbers of these simultaneous sources and receivers could be significantly less than those of the physical sources and receivers, the computational time and memory usage of any gradient-type inversion method suc

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4

Foks, Nathan Leon, Richard Krahenbuhl, and Yaoguo Li. "Adaptive sampling of potential-field data: A direct approach to compressive inversion." GEOPHYSICS 79, no. 1 (2014): IM1—IM9. http://dx.doi.org/10.1190/geo2013-0087.1.

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Анотація:

Compressive inversion uses computational algorithms that decrease the time and storage needs of a traditional inverse problem. Most compression approaches focus on the model domain, and very few, other than traditional downsampling focus on the data domain for potential-field applications. To further the compression in the data domain, a direct and practical approach to the adaptive downsampling of potential-field data for large inversion problems has been developed. The approach is formulated to significantly reduce the quantity of data in relatively smooth or quiet regions of the data set, w

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5

Portniaguine, Oleg, and Michael S. Zhdanov. "3‐D magnetic inversion with data compression and image focusing." GEOPHYSICS 67, no. 5 (2002): 1532–41. http://dx.doi.org/10.1190/1.1512749.

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We develop a method of 3‐D magnetic anomaly inversion based on traditional Tikhonov regularization theory. We use a minimum support stabilizing functional to generate a sharp, focused inverse image. An iterative inversion process is constructed in the space of weighted model parameters that accelerates the convergence and robustness of the method. The weighting functions are selected based on sensitivity analysis. To speed up the computations and to decrease the size of memory required, we use a compression technique based on cubic interpolation. Our method is designed for inversion of total m

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6

Pan, Shiyang, Tongchun Li, Guicai Shi, Zhen Cui, Hanjing Zhang, and Li Yuan. "The Inversion Analysis and Material Parameter Optimization of a High Earth-Rockfill Dam during Construction Periods." Applied Sciences 12, no. 10 (2022): 4991. http://dx.doi.org/10.3390/app12104991.

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Анотація:

Inversion analysis is usually an efficient solution to process the monitoring data of earth-rockfill dams. However, it is still difficult to obtain calculation results that are consistent with monitoring data due to different construction statuses. To deal with this situation and to introduce a new solution to improve calculation accuracy, the general method of inversion analysis based on back-propagation neural networks and the original step-by-step inversion method assuming that the parameters of the constitutive model vary with construction periods are introduced and verified in this work.

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7

Lin, Cherng-Yuan, and Keng-Hung Lin. "Comparison of the Engine Performance of Soybean Oil Biodiesel Emulsions Prepared by Phase Inversion Temperature and Mechanical Homogenization Methods." Processes 11, no. 3 (2023): 907. http://dx.doi.org/10.3390/pr11030907.

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The engine performance and emission characteristics of burning emulsions of soybean oil biodiesel in a compression-ignition diesel engine prepared through the phase inversion temperature method were compared with those of neat soybean oil biodiesel and the emulsion prepared by the mechanical homogenization method. The engine torque was set constantly at 98 N·m with varying engine speeds. The experimental results show that the emulsion prepared by the method of phase inversion temperature had higher O2 and NOx emissions, a higher excess air ratio, a higher exhaust gas temperature, and a higher

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8

Jiang, Dandan, Zhaofa Zeng, Shuai Zhou, Yanwu Guan, Tao Lin, and Pengyu Lu. "Three-Dimensional Magnetic Inversion Based on an Adaptive Quadtree Data Compression." Applied Sciences 10, no. 21 (2020): 7636. http://dx.doi.org/10.3390/app10217636.

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Three-dimensional magnetic inversion allows the distribution of magnetic parameters to be obtained, and it is an important tool for geological exploration and interpretation. However, because of the redundancy of the data obtained from large-scale investigations or high-density sampling, it is very computationally intensive to use these data for iterative inversion calculations. In this paper, we propose a method for compressing magnetic data by using an adaptive quadtree decomposition method, which divides the two-dimensional data region into four quadrants and progressively subdivides them b

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9

Liu, Weiqiang, and Liangyong Yang. "A New Method for Geophysical Induced Polarization Inversion Based on Stochastic Medium Model and Sample-Compressed Artificial Neural Network." Journal of Physics: Conference Series 2025, no. 1 (2021): 012010. http://dx.doi.org/10.1088/1742-6596/2025/1/012010.

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Abstract Induced polarization (IP) is a near-surface geophysical exploration method. Inverting the electrical properties of the underground medium from surface apparent IP parameters is a highly nonlinear problem. To further improve the accuracy, the artificial neural network (ANN) algorithm is applied to the two-dimensional (2D) IP data inversion for the first time. We firstly produced smooth geo-electric models based on the stochastic medium theory, and obtained the corresponding theoretical responses through forward modelling. Then, we compressed the responses and models through image compr

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10

Abubakar, A., T. M. Habashy, Y. Lin, and M. Li. "A model-compression scheme for nonlinear electromagnetic inversions." GEOPHYSICS 77, no. 5 (2012): E379—E389. http://dx.doi.org/10.1190/geo2011-0494.1.

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We have developed a model-compression scheme for improving the efficiency of the regularized Gauss-Newton inversion algorithm for marine controlled-source electromagnetic applications. In this scheme, the unknown model parameters (the conductivity/resistivity distribution) are represented in terms of a basis such as Fourier and wavelet (Haar and Daubechies). By applying a truncation criterion, the model may then be approximated by a reduced number of basis functions, which is usually much less than the number of the model parameters. Further, because the controlled-source electromagnetic measu

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11

Xie, Longhao, Qing Zhao, Chunguang Ma, Binbin Liao, and Jianjian Huo. "Ü-Net: Deep-Learning Schemes for Ground Penetrating Radar Data Inversion." Journal of Environmental and Engineering Geophysics 25, no. 2 (2020): 287–92. http://dx.doi.org/10.2113/jeeg19-074.

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Electromagnetic (EM) inversion is a quantitative imaging technique that can describe the dielectric constant distribution of a target based on the EM signals scattered from it. In this paper, a novel deep neural network (DNN) based methodology for ground penetrating radar (GPR) data inversion, known as the Ü-net is introduced. The proposed Ü-net consists of three parts: a data compression unit, U-net, and an output unit. The novel inversion approach, based on supervised learning, uses a neural network to generate the dielectric constant distribution from GPR data. The GPR data can be compresse

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12

Yin, Yanchun, Guangyan Liu, Tongbin Zhao, Qinwei Ma, Lu Wang, and Yubao Zhang. "Inversion Method of the Young’s Modulus Field and Poisson’s Ratio Field for Rock and Its Test Application." Materials 15, no. 15 (2022): 5463. http://dx.doi.org/10.3390/ma15155463.

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Анотація:

As one typical heterogeneous material, the heterogeneity of rock micro parameters has an important effect on its macro mechanical behavior. The study of the heterogeneity of micro parameters is more important to reveal the root cause of deformation and failure. However, as a typical heterogeneous material, the current testing and inversion method is not suitable for micro parameters measurement for the rock. Aiming at obtaining the distribution of micro Young’s modulus and micro Poisson’s ratio of the rock, based on the digital image correlation method (DIC) and finite element method (FEM), th

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13

Jiang, Huai, Min Han, and Hui Chang Zhao. "A New Imaging Method for Circular Trace Scanning SAR with Wide Observation." Applied Mechanics and Materials 716-717 (December 2014): 1047–50. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.1047.

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Circular Trace Scanning SAR is a new strip map mode SAR imaging in recent years, its imaging speed is fast with larger scene. This paper first establishes the imaging geometry right, by the four order approximation of the oblique distance model, combined with the series inversion method, and the removal of the coupling terms in the spectrum in the range Doppler domain, finally complete the azimuth compression. The simulation results prove the validity and feasibility of the imaging.

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14

Kukreja, Navjot, Jan Hückelheim, Mathias Louboutin, John Washbourne, Paul H. J. Kelly, and Gerard J. Gorman. "Lossy checkpoint compression in full waveform inversion: a case study with ZFPv0.5.5 and the overthrust model." Geoscientific Model Development 15, no. 9 (2022): 3815–29. http://dx.doi.org/10.5194/gmd-15-3815-2022.

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Abstract. This paper proposes a new method that combines checkpointing methods with error-controlled lossy compression for large-scale high-performance full-waveform inversion (FWI), an inverse problem commonly used in geophysical exploration. This combination can significantly reduce data movement, allowing a reduction in run time as well as peak memory. In the exascale computing era, frequent data transfer (e.g., memory bandwidth, PCIe bandwidth for GPUs, or network) is the performance bottleneck rather than the peak FLOPS of the processing unit. Like many other adjoint-based optimization pr

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15

Chen, Chow‐Son. "Mapping plate boundaries using TEM method along the Longitudinal Valley, Taiwan." GEOPHYSICS 63, no. 3 (1998): 868–79. http://dx.doi.org/10.1190/1.1444397.

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Анотація:

The transient electromagnetic (TEM) method was used to map plate boundaries in the Longitudinal Valley (LV), Taiwan. The SIROTEM in‐loop configuration with square transmitting loops 90 to 200 m on a side were used for this survey. More than 350 soundings were conducted in the valley. The field data were inverted by a smooth model inversion, and the soundings resolved more than 300 m beneath the LV. A set of geoelectric maps containing horizontal slices at different depths and vertical profiles from north to south along the LV have been constructed based on these inversion results. Based on the

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16

Rebetsky, Yu L., and R. S. Alekseev. "The Pattern and Possible Formation Mechanisms of Current Crustal Stress in High Asia." Russian Geology and Geophysics 63, no. 6 (2022): 726–42. http://dx.doi.org/10.2113/rgg20204246.

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Abstract —The pattern of current crustal stress in central and southeastern Asia has been reconstructed from earthquake focal mechanisms by inversion using Rebetsky’s method of cataclastic analysis. The inversion provides constraints on principal stress directions, as well as on relative magnitudes of maximum shear and effective isotropic pressure. The crust of the High Asian mountainous province is subject to horizontal extension or shear in plateaus (East and South Pamir and Tibet) and to horizontal compression or shear in mountain ranges. The relatively high horizontal compression in the ra

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17

Zhao, Li Jun, Feng Peng Zhang, Xiao Zhi Hu, and Bao Zong Huang. "Study on Interlaminar Shear and Damage Behavior of Carbon Fiber Composites with Short Fiber Interleaves: 1. The Comparative Test." Advanced Materials Research 41-42 (April 2008): 335–40. http://dx.doi.org/10.4028/www.scientific.net/amr.41-42.335.

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A special test setup was designed and used in compression shear test of unidirectional carbon fiber composites to study the effect of short fiber interleaves (SFIs) on the interlaminar shear behavior. The comparative tests for two kinds of double-notched compression specimens, with and without SFIs, were carried out to determine the interlaminar shear strength and modulus (ILSS and ILSM) and to examine the failure characteristics. To determine ILSM of the specimens with SFIs an inversion analysis method was proposed based on comparing compression displacement of specimens with and without SFIs

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18

Moon, Wooil M. "Born inversion of surface-scattered SAR (synthetic aperture radar) wave field." Canadian Journal of Physics 69, no. 10 (1991): 1256–60. http://dx.doi.org/10.1139/p91-188.

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A new approach to synthetic aperture radar (SAR) digital image formation, based on inverse scattering theory, is derived as an alternative to the conventional method of imaging surface-scattered wave fields. The conventional image formation technique for high-resolution SAR data utilized azimuth compression using correlation in the range-Doppler domain. More recent approaches in SAR image formation algorithms exploit downward extrapolation of the wave field in the frequency–wavenumber (f–k) domain to perform not only the azimuth compression but also the range curvature correction at the same t

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19

Tian, Guan Feng. "Three-Dimension Rheological Model and Parameters Solving for Unsaturated Soil." Advanced Materials Research 368-373 (October 2011): 2698–701. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.2698.

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Based on the three-dimension rheological model for unsaturated soil the constitutive equations are deduced by Laplace transformation. Then the time-dependent analytic expressions of vertical strain and lateral total stress in confined compression situation are also obtained. The modified confined rheological test has been carried out to get time-varying data of vertical strain and lateral total stress. Thus all the model parameters in the constitutive model can be calculated by the methods of curve fitting and formula inversion. At last, the method of the parameters solving is proved reasonabl

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20

Li, Zilong, and Yang Tang. "Mesoscopic Simulation Method for Uniaxial Compression Test of RCC Dam Material Based on DEM." Mathematical Problems in Engineering 2020 (December 17, 2020): 1–13. http://dx.doi.org/10.1155/2020/6686609.

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The roller compacted concrete (RCC) dam has become one of the most competitive dam types due to its fast construction speed, low cost, and strong adaptability. However, the macroscale compaction test can hardly reflect the mesoscopic structure on the RCC’s rolling characteristics. According to the characteristics of RCC dam materials, a numerical discrete element method (DEM) is proposed in this paper, which is used to simulate the irregular shape and proportion of RCC aggregates. Moreover, a mesoscopic parameter inversion method based on the adaptive differential evolution (ADE) algorithm is

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21

Zhou, Jian Jun, Zhan Ling Fu, Guo Bin Zhao, and Geng You Han. "Study on the Deep Rock Parameters of Fushun Mining Area." Advanced Materials Research 255-260 (May 2011): 3722–26. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.3722.

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In order to get the mechanical parameters of deep rock for the Fushun mining area, some mechanical properties tests of rock prepared from the drill core and trial adit were carried out. The complex mechanical parameters of rock mass were proposed by inversion of B-P neural network method with intruding the uniformity design theory. The deep rock parameters were amended and correction factor was proposed by according to geostress test and high confining pressure triaxial compression test.

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22

Zhou, Jian Jun, Ke Ke Xie, Lei Chen, and Zhi Peng Gong. "Parameters of Muzhuping Landslide in the Shuibuya Reservoir." Applied Mechanics and Materials 90-93 (September 2011): 442–45. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.442.

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Landslide is common geological hazards to the hydropower reservoir. Reasonable parameters are the key to design and prevent the landslide. After geological exploration, a few laboratory tests (uniaxial compression test, unsaturated permeability test, unsaturated direct-shear test) were conducted for the sliding mass. In order to obtain reasonable strength parameters of sliding mass, basing on the experimental results, some researches (such as engineering analogy, parametric inversion) were performed by using limit equilibrium method. The mechanical parameters of the slope were proposed.

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23

Pereira Lara, Ana Maria, and Tiago Cavalcanti Rolim. "Analysis of the Shock Wave/Boundary Layer Interaction considering a Compression Corner Model Using the MacCormack Method." Journal of Engineering 2023 (March 22, 2023): 1–30. http://dx.doi.org/10.1155/2023/8115465.

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The objective of this paper is to numerically study the shock wave/boundary layer interaction and boundary layer separation. The first stage of this research is the development of methodology, flow simulations, and data analysis. When comparing the plots, it can be seen that the results of the check of the methodology were similar. Following, methodologies were developed and simulations were carried out considering the compression corner model. It was noticed that the shock wave could be identified by the jump on the pressure profile near the leading edge and by analyzing the thermodynamic pro

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24

Sobczyk, Artur, and Jacek Szczygieł. "Paleostress reconstruction of faults recorded in the Niedźwiedzia Cave (Sudetes): insights into Alpine intraplate tectonic of NE Bohemian Massif." International Journal of Earth Sciences 110, no. 3 (2021): 833–47. http://dx.doi.org/10.1007/s00531-021-01994-1.

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AbstractBrittle structures identified within the largest karstic cave of the Sudetes (the Niedźwiedzia Cave) were studied to reconstruct the paleostress driving post-Variscan tectonic activity in the NE Bohemian Massif. Individual fault population datasets, including local strike and dip of fault planes, striations, and Riedel shear, enabled us to discuss the orientation of the principal stresses tensor. The (meso) fault-slip data analysis performed both with Dihedra and an inverse method revealed two possible main opposing compressional regimes: (1) NE–SW compression with the formation of str

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25

Guo, Lixia, Song Li, Ling Zhong, Lei Guo, and Lunyan Wang. "Inverse Analysis of Concrete Meso-constitutive Model Parameters Considering Aggregate Size Effect." Science and Engineering of Composite Materials 27, no. 1 (2020): 397–404. http://dx.doi.org/10.1515/secm-2020-0043.

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AbstractThe meso numerical simulation has become an important method to study the characteristics of materials; however, the key to its further application is determining the parameters of meso-constitutive model. Considering that the meso-scale parameters of materials are hard to measure, this paper took into account the aggregate size effect and proposed a meso-parameter identification method by combining random aggregate numerical simulation and genetic algorithm. First, a random aggregate model of concrete was established, and its meso-model parameters were analyzed. The Morris method was

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26

Bartaschuk, Оleksii, and Vasyl Suyarko. "GEODYNAMICS." GEODYNAMICS 1(30)2021, no. 1(30) (2021): 25–35. http://dx.doi.org/10.23939/jgd2021.01.025.

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The second part of the article studies the tectonic conditions and natural mechanisms of tectonic inversion of the Dnieper-Donets Basin and the Western Donets Graben. Method. The research uses the original method of reconstruction of fields of tectonic stresses and deformations. It also makes tectonophysical analysis of geostructures was used. The analytical base of the research consisted of the latest materials of geo-mapping, numerical modeling of deformations of the southern edge of the Eastern European platform and comparison of model and reconstructed stress fields. Results. In the geodyn

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27

Doroshenko, Volodymyr, and Alexander Yanchenko. "PREREQUISITES FOR THE PRODUCTION OF CONNECTOR ASSEMBLIES OF BUILDING METAL STRUCTURES BY FOUNDRY METHOD ACCORDING TO ONE-TIME PATTERNS." Modern technology, materials and design in construction 32, no. 1 (2022): 14–20. http://dx.doi.org/10.31649/2311-1429-2022-1-14-20.

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The article reviews the common elements of prefabricated modular building metal structures with a list of their advantages and assessment of the prospects for the manufacture of their important components of the Lost Foam Casting (LFC) process. Such construction with the use of metal structures must have all the prerequisites to become an impetus and an effective solution in the construction industry, which will contribute to the reconstruction of the country. The fabrication of connector assemblies and bolt brackets for connecting beams and connectors with flexible steel plates for seismicall

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28

Armstrong, M. A., M. Ravasio, W. G. Versteijlen, D. J. Verschuur, A. V. Metrikine, and K. N. van Dalen. "Seismic inversion of soil damping and stiffness using multichannel analysis of surface wave measurements in the marine environment." Geophysical Journal International 221, no. 2 (2020): 1439–49. http://dx.doi.org/10.1093/gji/ggaa080.

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SUMMARY Determination of soil material damping is known to be difficult and uncertain, especially in the offshore environment. Using an advanced inversion methodology based on multichannel spectral analysis, Scholte and Love wave measurements are used to characterize subsea soil from a North Sea site. After normalization, a determinant-based objective function is used in a genetic algorithm optimization to estimate the soil shear modulus. The inverted shear-modulus profile is comparable to previously published results for the same data, although a higher degree of certainty is achieved in the

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29

Säglitz, Sylvia A., and Michael R. Gaab. "Investigations using magnetic resonance imaging: is neurovascular compression present in patients with essential hypertension?" Journal of Neurosurgery 96, no. 6 (2002): 1006–12. http://dx.doi.org/10.3171/jns.2002.96.6.1006.

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Object. A possible relationship between neurovascular compression of the rostral ventrolateral medulla oblongata (RVLM) and essential hypertension is investigated using a specifically designed magnetic resonance (MR) imaging method. In conjunction with the ninth and 10th cranial nerves, baroreceptor afferents enter the RVLM, which represents a crucial relay for regulation of autonomic blood pressure. In 1985 Jannetta and coworkers proposed a causal relationship between essential hypertension and intraoperatively observed neurovascular compression of the left RVLM. Methods. Currently, MR imagin

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30

Li, Chuang, Heng Zhang, and Yunkai Deng. "Focus Improvement of Airborne High-Squint Bistatic SAR Data Using Modified Azimuth NLCS Algorithm Based on Lagrange Inversion Theorem." Remote Sensing 13, no. 10 (2021): 1916. http://dx.doi.org/10.3390/rs13101916.

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In this paper, a modified azimuth nonlinear chirp scaling (NLCS) algorithm is derived for high-squint bistatic synthetic aperture radar (BiSAR) imaging to solve its inherent difficult issues, including the large range cell migration (RCM), azimuth-dependent Doppler parameters, and the sensibility of the higher order terms. First, using the Lagrange inversion theorem, an accurate spectrum suitable for processing airborne high-squint BiSAR data is introduced. Different from the spectrum that is based on the method of series reversion (MSR), it is allowed to derive the bistatic stationary phase p

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31

Smithyman, B. R., R. M. Clowes, and E. Bordet. "New geophysical models for subsurface velocity structure in the Nechako–Chilcotin plateau from 2.5-D waveform tomography." Canadian Journal of Earth Sciences 51, no. 4 (2014): 373–92. http://dx.doi.org/10.1139/cjes-2013-0152.

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Seismic inversion is applied to generate physical property models (P-wave velocity and numerical attenuation) for four profiles in the Nechako–Chilcotin plateau region of south-central British Columbia, Canada. A newly developed method that combines three-dimensional (3-D) travel-time inversion and 2.5-dimensional (2.5-D) viscoacoustic full-waveform inversion was applied to generate the geophysical models from vibroseis data acquired along the preexisting crooked roads. These models are useful for the characterization of rock types in terms of their positions and thicknesses, which may be used

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32

Kwon, Ryun-Young, and Angelos Vourlidas. "The density compression ratio of shock fronts associated with coronal mass ejections." Journal of Space Weather and Space Climate 8 (2018): A08. http://dx.doi.org/10.1051/swsc/2017045.

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We present a new method to extract the three-dimensional electron density profile and density compression ratio of shock fronts associated with coronal mass ejections (CMEs) observed in white light coronagraph images. We demonstrate the method with two examples of fast halo CMEs (∼2000 km s−1) observed on 2011 March 7 and 2014 February 25. Our method uses the ellipsoid model to derive the three-dimensional geometry and kinematics of the fronts. The density profiles of the sheaths are modeled with double-Gaussian functions with four free parameters, and the electrons are distributed within thin

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33

BARTASHCHUK, Оleksiy. "Collision deformations of the Dnieper-Donets Depression Article 3. Geodynamic model of tectonic inversion." Geology and Geochemistry of Combustible Minerals 1, no. 182 (2020): 40–51. http://dx.doi.org/10.15407/ggcm2020.01.040.

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The article concludes the trilogy on post-strip deformations of the Dnieper-Donets Basin. The results of tectonophysical analysis of collision deformations of the platform cover of the south-eastern part of the Dnieper-Donets Basin are summarized. Using the original method of reconstruction of stress and strain fields and tectonophysical analysis of geostructures, the system organization of inversion structural deformations of the Dnieper-Donets Basin and Donbass was studied. The tectonic inversion of the Dnieper-Donets Basin began in the Late Hercynian epoch in the situation of a general-plat

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34

Sakhaei, Seyed Reza, and Ghasem Ghorbani Rostam. "Crustal deformation analysis in Zagros and Makran zones, based on GPS permanent network data." Contributions to Geophysics and Geodesy 50, no. 1 (2020): 61–81. http://dx.doi.org/10.31577/congeo.2020.50.1.4.

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We present an analysis of strain based on the evaluation of crustal deformation in Zagros and Makran, which has implications in terms of the dynamics of the study area. We have used data from 17 permanent GPS stations of the Cartographic Centre of Iran spanning the period 2011–2013. The raw observed data were in RINEX format. The elements of strain tensor were calculated by a 2D isoparametric method and the inversion of strain equation. Then the dilatation (extension and compression) and shearing were obtained through the analysis of eigenvalue and eigenvector of tensors. In most cases compres

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35

Rocher, Muriel, Marc Cushing, Francis Lemeille, and Stéphane Baize. "Stress induced by the Mio-Pliocene Alpine collision in northern France." Bulletin de la Société Géologique de France 176, no. 4 (2005): 319–28. http://dx.doi.org/10.2113/176.4.319.

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Abstract In most rocks, tectonic stress induces crystalline deformation, such as mechanical twinning. The inverse analysis of calcite twinning allows reconstruction of both directions and values of the paleostress field. The Etchecopar inverse method using calcite twinning has been improved in this paper, lowering the uncertainties on the calculated stress values. Calcite was sampled in the foreland of the western Alps, along a SE-NW section from the Jura Mountains to the Isle of Wight. The calcite twinning inversion has identified the successive Cenozoic tectonic events, named “Pyrenean” comp

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36

Ghalenoei, Emad, Jan Dettmer, Mohammed Y. Ali, and Jeong Woo Kim. "Trans-dimensional gravity and magnetic joint inversion for 3-D earth models." Geophysical Journal International 230, no. 1 (2022): 363–76. http://dx.doi.org/10.1093/gji/ggac083.

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SUMMARY Studying 3-D subsurface structure based on spatial data is an important application for geophysical inversions. However, major limitations exist for conventional regularized inversion when applied to potential-field data. For example, global regularization parameters can mask model features that may be important for interpretation. In addition, 3-D inversions are typically based on data acquired in 2-D at the Earth’s surface. Such data may contain significant spatial error correlations in 2-D due to the choice of spatial sampling, acquisition geometry, ambient noise and model assumptio

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37

Mkhitaryan, S. M. "On the Application of the Method of Hypersingular Integral Equations to Solving Problems for an Elastic Plane with a Collinear System of Cracks." UNIVERSITY NEWS. NORTH-CAUCASIAN REGION. NATURAL SCIENCES SERIES, no. 2 (206) (June 18, 2020): 72–83. http://dx.doi.org/10.18522/1026-2237-2020-2-72-83.

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In the present paper, using the method of hypersingular integral equations, based on the formulas of the inversion of the corresponding singular integral equations, the exact quadrature solution of the classical problems of the mechanics of an elastic plane with a collinear system of cracks is constructed. The elastic plane is in a state of antiplane deformation or plane deformation; in case of antiplane deformation, crack edges are symmetrically loaded by tangential forces, while in case of plane deformation, they are again loaded symmetrically but by normal forces. Mixed boundary-value probl

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38

Giampiccolo, Riccardo, Alberto Bernardini, Oliviero Massi, and Augusto Sarti. "On the Virtualization of Audio Transducers." Sensors 23, no. 11 (2023): 5258. http://dx.doi.org/10.3390/s23115258.

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In audio transduction applications, virtualization can be defined as the task of digitally altering the acoustic behavior of an audio sensor or actuator with the aim of mimicking that of a target transducer. Recently, a digital signal preprocessing method for the virtualization of loudspeakers based on inverse equivalent circuit modeling has been proposed. The method applies Leuciuc’s inversion theorem to obtain the inverse circuital model of the physical actuator, which is then exploited to impose a target behavior through the so called Direct–Inverse–Direct Chain. The inverse model is design

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39

YADAV, Abhishek, Suresh KANNAUJIYA, Prashant Kumar CHAMPATI RAY, Rajeev Kumar YADAV, and Param Kirti GAUTAM. "Estimation of crustal deformation parameters and strain build-up in Northwest Himalaya using GNSS data measurements." Contributions to Geophysics and Geodesy 51, no. 3 (2021): 225–43. http://dx.doi.org/10.31577/congeo.2021.51.3.2.

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GPS measurements have proved extremely useful in quantifying strain accumulation rate and assessing seismic hazard in a region. Continuous GPS measurements provide estimates of secular motion used to understand the earthquake and other geodynamic processes. GNSS stations extending from the South of India to the Higher Himalayan region have been used to quantify the strain build-up rate in Central India and the Himalayan region to assess the seismic hazard potential in this realm. Velocity solution has been determined after the application of Markov noise estimated from GPS time series data. Th

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40

Nazarova, Larisa A., and Leonid Nazarov. "Method for weak zones location at the coal-bed – host rock joint relative to the problem of sudden outbursts: theory and laboratory experiment." Frattura ed Integrità Strutturale 17, no. 63 (2022): 13–25. http://dx.doi.org/10.3221/igf-esis.63.02.

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Within the framework of a geomechanical model that describes the deformation of a rock mass during the subhorizontal coal-bed extraction, the mechanism for the formation and implementation of a sudden outburst is substantiated: as working face gets close to the weak zone of coal-bed – host rock joint, areas of tensile stresses arise, which creates the prerequisites for face space spalling and coal loss with methane. The inverse problem of determining the conditions at the horizontal boundaries of a coal-bed is formulated and solved using tomography data (longitudinal wave velocity V distributi

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41

D’yachkov, Pavel. "Electromechanical Property Calculation of Carbon Nanotubes Using Linear Augmented Cylindrical Wave Method." Applied Functional Materials 2, no. 2 (2022): 35–47. http://dx.doi.org/10.35745/afm2022v02.02.0006.

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Deformations of single-walled carbon nanotubes (SWNTs) change their band structure in the nanoelectromechanical systems. In this study, we investigated the response of the electronic structure of chiral and nonchiral SWNTs (8,7), (9,6), (10,5), (7,7), (11,0), (12,0), and (13,0) to twisting and axial tension modes by using the symmetrized linear augmented cylindrical wave technique. We showed that perturbations of the band structures depend on a “family” index p = (n1 − n2)mod 3 (where p = −1, 0 or 1). Twisting the semiconducting (8,7) tubule with p = 1 in the direction of the screw axis is acc

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42

Wang, Li, Ruizhao Yang, Zhipeng Sun, Lingda Wang, Jialiang Guo, and Ming Chen. "Overpressure: Origin, Prediction, and Its Impact in the Xihu Sag, Eastern China Sea." Energies 15, no. 7 (2022): 2519. http://dx.doi.org/10.3390/en15072519.

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The complex relationship between deep overpressure, abnormal porosity, and hydrocarbon generation in the Pinghu Formation is interesting and challenging for hydrocarbon exploration and development in the East China Sea Shelf Basin. It shows three-stage pore pressure evolution based on the characteristics of logs in the west slope of the Xihu Sag. Disequilibrium compaction was identified as the dominant overpressure mechanism in stage II (1.0 < PC < 1.6). The fluid expansion was identified as the predominant mechanism of overpressure generation in stage III (PC > 1.6), and tectonic com

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43

Bansal, Rishi, and Mike Matheney. "Wavelet distortion correction due to domain conversion." GEOPHYSICS 75, no. 6 (2010): V77—V87. http://dx.doi.org/10.1190/1.3494081.

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Converted-wave (PS) data, when converted to PP time, develop time- and location-varying compression of the seismic wavelet due to a variable subsurface [Formula: see text] [Formula: see text]. The time-dependent compression distorts the wavelet in a seismic trace. The lack of a consistent seismic wavelet in a domain-converted PS volume can eventually lead to an erroneous joint PP/PS inversion result. Depth-converted seismic data also have wavelet distortion due to velocity-dependent wavelet stretch. A high value of seismic velocity produces more stretch in a seismic wavelet than a low value. V

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44

Moghadas, Davood, and Jasper A. Vrugt. "The Influence of Geostatistical Prior Modeling on the Solution of DCT-Based Bayesian Inversion: A Case Study from Chicken Creek Catchment." Remote Sensing 11, no. 13 (2019): 1549. http://dx.doi.org/10.3390/rs11131549.

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Low frequency loop-loop electromagnetic induction (EMI) is a widely-used geophysical measurement method to rapidly measure in situ the apparent electrical conductivity (ECa) of variably-saturated soils. Here, we couple Bayesian inversion of a quasi-two-dimensional electromagnetic (EM) model with image compression via the discrete cosine transform (DCT) for subsurface electrical conductivity (EC) imaging. The subsurface EC distributions are obtained from multi-configuration EMI data measured with a CMD-Explorer sensor along two transects in the Chicken Creek catchment (Brandenburg, Germany). Di

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45

Jiang, Yang, Yurong Tang, Wen Li, et al. "Determination Method of Core Parameters for the Mechanical Classification Simulation of Thin-Skinned Walnuts." Agriculture 13, no. 1 (2022): 104. http://dx.doi.org/10.3390/agriculture13010104.

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Simulation can be used to visualize the mechanical classification of walnuts. It can collect microscopic information about walnuts in the classification roller and guide its optimization design. In this process, simulation parameters are essential factors that ensure the effectiveness of the simulation. In this study, the crucial parameters of thin-skinned walnut particles in classification simulation were determined by combining the discrete element method (DEM) and physical tests. Firstly, the moisture content, shear modulus, stacking angle, and some contact parameters in the shell and kerne

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46

Tompkins, Michael J., Juan L. Fernández Martínez, David L. Alumbaugh, and Tapan Mukerji. "Scalable uncertainty estimation for nonlinear inverse problems using parameter reduction, constraint mapping, and geometric sampling: Marine controlled-source electromagnetic examples." GEOPHYSICS 76, no. 4 (2011): F263—F281. http://dx.doi.org/10.1190/1.3581355.

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We have developed a new uncertainty estimation method that accounts for nonlinearity inherent in most geophysical problems, allows for the explicit search of model posterior space, is scalable, and maintains computational efficiencies on the order of deterministic inverse solutions. We accomplish this by combining an efficient parameter reduction technique, a parameter constraint mapping routine, a sparse geometric sampling scheme, and an efficient forward solver. In order to reduce our model domain and determine an independent basis, we implement both a typical principal component analysis, w

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47

ROSTAM, Ghasem Ghorbani. "Determination of the stress field in the Kopeh Dagh and Eastern Iran regions." Contributions to Geophysics and Geodesy 52, no. 1 (2022): 95–112. http://dx.doi.org/10.31577/congeo.2022.52.1.4.

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The land of Iran is situated in a compression zone with a high seismicity rate due to the convergence of Arabian and Eurasian plates. In this study, the stress field of two provinces of Kopeh Dagh and Eastern Iran, which are located in the east and northeast of Iran, has been studied and compared. These two provinces are different in terms of seismicity patterns so that Kopeh Dagh is much more active than Eastern Iran. To achieve this goal, the iterative joint inversion method for stress and fault orientations developed by Vavryčuk (2014) has been used. The average direction of the maximum pri

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48

ROSTAM, Ghasem Ghorbani. "Determination of the stress field in the Kopeh Dagh and Eastern Iran regions." Contributions to Geophysics and Geodesy 52, no. 1 (2022): 95–112. http://dx.doi.org/10.31577/congeo.2022.52.1.4.

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Анотація:

The land of Iran is situated in a compression zone with a high seismicity rate due to the convergence of Arabian and Eurasian plates. In this study, the stress field of two provinces of Kopeh Dagh and Eastern Iran, which are located in the east and northeast of Iran, has been studied and compared. These two provinces are different in terms of seismicity patterns so that Kopeh Dagh is much more active than Eastern Iran. To achieve this goal, the iterative joint inversion method for stress and fault orientations developed by Vavryčuk (2014) has been used. The average direction of the maximum pri

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49

Wang, Xiaoxing, Lixin Zhang, Yu Zhao, and Huijian Li. "A New Uniaxial Tensile Model for Foam Metal/Epoxy Interpenetrated Phase Composites." Polymers 15, no. 4 (2023): 812. http://dx.doi.org/10.3390/polym15040812.

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Foam metal/epoxy interpenetrating phase composite is a new type of composite material with interpenetrating continuity in composition, which exhibits different intrinsic relationships under different stress states in tension and compression, and it is necessary to study the intrinsic relationships in the tensile state in depth. A mesoscopic damage-based tensile intrinsic model is developed, and the elasto-plastic tensile intrinsic equations of the representative volume element are derived based on small deformation theory and total strain theory, as well as the assumptions of equal stress and

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50

Ladak, Sameer, Sheri Molnar, and Samantha Palmer. "Multi-method site characterization to verify the hard rock (Site Class A) assumption at 25 seismograph stations across Eastern Canada." Earthquake Spectra 37, no. 1_suppl (2021): 1487–515. http://dx.doi.org/10.1177/87552930211001076.

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Site characterization is a crucial component in assessing seismic hazard, typically involving in situ shear-wave velocity ( VS) depth profiling, and measurement of site amplification including site period. Noninvasive methods are ideal for soil sites and become challenging in terms of field logistics and interpretation in more complex geologic settings including rock sites. Multiple noninvasive active- and passive-seismic techniques are applied at 25 seismograph stations across Eastern Canada. It is typically assumed that these stations are installed on hard rock. We investigate which site cha

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