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3d geometric modeling for the Yanjinggou anticline in the Longmen Shan fold-and-thrust belt, China: Oblique thrusting kinematic implications

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JOURNAL OF ASIAN EARTH SCIENCES 2019年第0期179卷 99-111页

作者： Li, Zhigang Zhang, Peizhen Jia, dong Zheng, Wenjun Sun, Chuang Li, Yiquan Almeidad, Rafael Chen, Wei Li, Tao Sun Yat Sen Univ Sch Earth Sci & Engn Guangdong Prov Key Lab Geodynam & Geohazards Guangzhou Guangdong Peoples R China Nanjing Univ Sch Earth Sci & Engn Nanjing Jiangsu Peoples R China Nanjing Univ Sch Geog & Ocean Sci Nanjing Jiangsu Peoples R China Yachay Tech Univ Sch Earth Sci Energy & Environm Urcuqui Ecuador Southwest Petr Univ Sch Geosci & Technol Chengdu Sichuan Peoples R China

Three-dimensional (3d) subsurface seismic data acquisition and modeling are rarely undertaken;consequently, the complex effects of oblique thrusting on the 3d morphology and kinematics of folds are still poorly understood. We use 3d seismic data to produce five 3d geometric models and compare our results with structural models of the Yanjinggou anticline in the Longmen Shan fold-and-thrust belt, to investigate the effects of oblique thrusting on 3d fold evolution. 3d geometric modeling results reveal that oblique thrusting may cause fold asymmetry, vertical axis rotation, and a curved fold axis. 3d seismic interpretations and structural modeling suggest that the Yanjinggou anticline developed as a trishear fault-propagation fold and experienced a maximum shortening amount of 1.2 +/- 0.1 km. The 3d structural and geometric models are consistent with paleomagnetic results, suggesting that the anticline was affected by oblique thrusting at an angle of 55 above a listric thrust fault with three fault ramps (19, 30, and 40), causing the fold to rotate and develop a curved morphology. The integrated method used in this study to investigate the effects of oblique thrusting on 3d fold morphology and kinematics can be applied to regional oblique thrusting in the Longmen Shan and other fold-and-thrust belts worldwide.

关键词： Longmen Shan Yanjinggou anticline Oblique thrusting 3d geometric model Fault-propagation fold Paleomagnetic analysis

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Structural Variation between the Western and Eastern Kuqa Fold-and-thrust Belt,China:Insights from Seismic Interpretation and Analog modeling

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Acta Geologica Sinica(English Edition) 2023年第4期97卷 1078-1093页

作者： WANG Wei XIE Huiwen YIN Hongwei JIA dong XU Zhenping LUO Haoyu HE Wanhui YUAN Rui dUAN Yunjiang School of Earth Science and Engineering Nanjing UniversityNanjing 210046China Research Institute of Petroleum Exploration and Development Tarim Oilfield CompanyPetroChinaKorlaXinjiang 841000China

The Kuqa fold-and-thrust belt exhibits apparent structural variation in the western and eastern *** salt layer act as effective decollements and influence the varied *** this study,detailed seismic interpretations and analog modeling are presented to construct the suprasalt and subsalt structures in the transfer zone of the middle Kuqa and investigate the influence of the two salt *** results reveal that the relationship of the two salt layers changes from separated to connected,and then overlapped toward the foreland in the transfer *** structural models are formed in the suprasalt and subsalt units due to the interaction of the two salt *** imbricate thrust faults form two broom-like fault systems in the subsalt *** suprasalt units develop detached folds terminating toward the east in the region near the orogenic ***,two offset anticlines with different trends develop at the frontal edge of the lower salt layer and the trailing edge of the upper salt layer,*** to exploration results in this region,the relationship between suprasalt and subsalt structures has an influence on hydrocarbon *** believe that the connected deformation contains high-risk plays while the decoupled deformation contains well-preserved plays.

关键词： along-strike variation analog modeling 3d geometric model salt-related structure Kuqa fold-and-thrust belt

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Probability Characteristics of a Crack Hitting Spherical Healing Agent Particles: Application to a Self-Healing Cementitious System

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MATERIALS 2022年第20期15卷 7355-7355页

作者： Guo, Shannon Chidiac, Samir E. McMaster Univ Dept Civil Engn Hamilton ON L8S 4L8 Canada

A geometric model is developed to statistically study the probability characteristics of crack intersecting self-healing capsules with a structured random distribution in a cement paste mix. To evaluate the probability of a crack intersecting encapsulated particles, the fill ratio of the crack, and the depth of the first-hit capsule, Monte Carlo simulations are performed. The variables are the crack geometry, i.e., width, length, depth, orientation, skewness, and so on;the size and mass fraction of healing capsules;and the agglomeration of capsules. models based on statistical analyses for hit probability Ph, crack fill ratio Rf-95 at 95% confidence level, and first hit depth h0-95 at 95% confidence level are expressed as functions of capsule size and mass fraction, as well as crack geometry. The model assumptions and results are evaluated using data reported in the literature. The data include results from experimental and theoretical studies.

关键词： 3d geometric model statistical model self-healing cementitious material spherical capsules fill ratio hit probability

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Numerical Simulation of Heat Transfer Through Carbon Fabrics under Convective Heat 13

Numerical Simulation of Heat Transfer Through Carbon Fabrics...

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13th Textile Bioengineering and Informatics Symposium (TBIS)

作者： Zheng, Zhen-Rong Wang, Jia-Wei Han, Chen-Chen Zhao, Xiao-Ming Tiangong Univ Sch Text Sci & Engn Tianjin Peoples R China Minist Educ Key Lab Adv Text Composites Tianjin Peoples R China

Carbon fiber fabrics have important applications in high-speed railway, aviation and aerospace. When the external environment applies convection heat to the fabric, the structure of the fabric has a great influence on its heat transfer performance. In order to study the heat transfer performance of carbon fiber fabrics under convective heat, a 3d geometric model of carbon fiber fabric was built and an energy conservation equation of the fabric under the heat flux was proposed. These systems provide the theoretical basis for further study of the heat transfer process of carbon fiber fabrics under high heat flux and effects of fabric structure on the heat resistance of the fabrics. To verify the numerical simulation results, a test platform for heat transfer performance of textiles under convective heat flux has been built. The results showed that the heat transfer numerical model can detect the temperature distribution of the carbon fiber fabric under heat flux. The temperature of fabric increased with the increase of heat fluxes. Verification experiments found that the average relative error between simulated and experimental value was 6.64% and 3.28% when the heat flux were 1319W/m(2) and 1103W/m(2) , respectively. It indicated that the numerical model can show the heat transfer performance of the carbon fiber fabric.

关键词： Carbon Fiber Fabric Heat Transfer 3d geometric model Numerical Simulation Heat Flux

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Numerical Simulation of Heat Transfer Through Carbon Fabrics under Convective Heat

Numerical Simulation of Heat Transfer Through Carbon Fabrics...

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作者： Zhen-Rong Zheng Jia-Wei Wang Chen-Chen Han Xiao-Ming Zhao School of Textile Science and Engineering Tiangong University Key Laboratory of Advanced Textile Composites of Ministry of Education

Carbon fiber fabrics have important applications in high-speed railway, aviation and aerospace. When the external environment applies convection heat to the fabric, the structure of the fabric has a great influence on its heat transfer performance. In order to study the heat transfer performance of carbon fiber fabrics under convective heat, a 3 d geometric model of carbon fiber fabric was built and an energy conservation equation of the fabric under the heat flux was proposed. These systems provide the theoretical basis for further study of the heat transfer process of carbon fiber fabrics under high heat flux and effects of fabric structure on the heat resistance of the fabrics. To verify the numerical simulation results, a test platform for heat transfer performance of textiles under convective heat flux has been built. The results showed that the heat transfer numerical model can detect the temperature distribution of the carbon fiber fabric under heat flux. The temperature of fabric increased with the increase of heat fluxes. Verification experiments found that the average relative error between simulated and experimental value was 6.64% and 3.28% when the heat flux were 1319 W/m and 1103 W/m, respectively. It indicated that the numerical model can show the heat transfer performance of the carbon fiber fabric.

关键词： Carbon Fiber Fabric Heat Transfer 3d geometric model Numerical Simulation Heat Flux

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Automatic Extraction of Three-dimensional Thoracic Aorta geometric model from Phase Contrast MRI for Morphometric and Hemodynamic Characterization

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MAGNETIC RESONANCE IN MEdICINE 2016年第2期75卷 873-882页

作者： Volonghi, Paola Tresoldi, daniele Cadioli, Marcello Usuelli, Antonio M. Ponzini, Raffaele Morbiducci, Umberto Esposito, Antonio Rizzo, Giovanna CNR Inst Mol Bioimaging & Physiol Segrate MI Italy Philips Healthcare Monza Italy CINECA Segrate MI Italy Politecn Torino Dept Mech & Aerosp Engn Turin Italy Sci Inst HS Raffaele Dept Radiol Milan Italy

Purpose: To propose and assess a new method that automatically extracts a three-dimensional (3d) geometric model of the thoracic aorta (TA) from 3d cine phase contrast MRI (PCMRI) acquisitions. Methods: The proposed method is composed of two steps: segmentation of the TA and creation of the 3d geometric model. The segmentation algorithm, based on Level Set, was set and applied to healthy subjects acquired in three different modalities (with and without SENSE reduction factors). Accuracy was evaluated using standard quality indices. The 3d model is characterized by the vessel surface mesh and its centerline;the comparison of models obtained from the three different datasets was also carried out in terms of radius of curvature (RC) and average tortuosity (AT). Results: In all datasets, the segmentation quality indices confirmed very good agreement between manual and automatic contours (average symmetric distance < 1.44 mm, dICE Similarity Coefficient > 0.88). The 3d models extracted from the three datasets were found to be comparable, with differences of less than 10% for RC and 11% for AT. Conclusion: Our method was found effective on PCMRI data to provide a 3d geometric model of the TA, to support morphometric and hemodynamic characterization of the aorta. (C) 2015 Wiley Periodicals, Inc.

关键词： thoracic aorta phase contrast MRI level set segmentation 3d geometric model

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geometric modeling of terry fabric

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INTERNATIONAL JOURNAL OF CLOTHING SCIENCE ANd TECHNOLOGY 2015年第2期27卷 237-246页

作者： Singh, Jitendra Pratap Behera, Bijoya Kumar UP Text Technol Inst Dept Text Technol Kanpur Uttar Pradesh India Indian Inst Technol Delhi Dept Text Technol New Delhi India

Purpose - The purpose of this paper is to develop a 3d geometric model of three- pick terry fabric considering the actual design and structural features of the finished terry fabric. design/methodology/approach - The model has been developed using SolidWorks CAd system and the output file can be easily simulated in the ANSYS. dimensions are acquired from the actual terry fabric measurement. Findings - A 3d computational model - to be used for understanding the behaviour of terry fabric during actual use through the simulation in ANSYS. Practical implications - Provides the way to study the yarn and fabric structure behaviour during use through simulation. Originality/value - The research resulted a 3d geometrical model of very complex three-pick terry fabric for very first time for further analysis of terry fabric behaviour during use.

关键词： Three-pick terry fabric 3d geometric model Fabric behaviour Solidworks

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3d geometry of growth strata in a fault-propagation fold: insights into space-time evolution of the Crevillente Fault (Abanilla-Alicante sector), Betic Cordillera, Spain

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INTERNATIONAL JOURNAL OF EARTH SCIENCES 2015年第5期104卷 1387-1404页

作者： Martin-Rojas, I. Alfaro, P. Estevez, A. Univ Alicante Dept Ciencias Tierra & Medio Ambiente Alicante 03690 Spain

This work presents a 3d geometric model of growth strata cropping out in a fault-propagation fold associated with the Crevillente Fault (Abanilla-Alicante sector) from the Bajo Segura Basin (eastern Betic Cordillera, southern Spain). The analysis of this 3d model enables us to unravel the along-strike and along-section variations of the growth strata, providing constraints to assess the fold development, and hence, the fault kinematic evolution in space and time. We postulate that the observed along-strike dip variations are related to lateral variation in fault displacement. Along-section variations of the progressive unconformity opening angles indicate greater fault slip in the upper Tortonian-Messinian time span;from the Messinian on, quantitative analysis of the unconformity indicate a constant or lower tectonic activity of the Crevillente Fault (Abanilla-Alicante sector);the minor abundance of striated pebbles in the Pliocene-Quaternary units could be interpreted as a decrease in the stress magnitude and consequently in the tectonic activity of the fault. At a regional scale, comparison of the growth successions cropping out in the northern and southern limits of the Bajo Segura Basin points to a southward migration of deformation in the basin. This means that the Bajo Segura Fault became active after the Crevillente Fault (Abanilla-Alicante sector), for which activity on the latter was probably decreasing according to our data. Consequently, we propose that the seismic hazard at the northern limit of the Bajo Segura Basin should be lower than at the southern limit.

关键词： Growth strata 3d geometric model Fault-propagation fold Bajo Segura Basin Crevillente Fault (Abanilla-Alicante sector)

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Patient-specific anisotropic model of human trunk based on MR data

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INTERNATIONAL JOURNAL FOR NUMERICAL METHOdS IN BIOMEdICAL ENGINEERING 2015年第9期31卷 n/a-N.PAG页

作者： Courchesne, Olivier Guibault, Francois Parent, Stefan Cheriet, Farida Ecole Polytech Inst Biomed Engn Montreal PQ H3T 1J4 Canada Ecole Polytech Comp Engn Montreal PQ H3T 1J4 Canada St Justine Univ Hosp Ctr Res Ctr Montreal PQ H3T 1J4 Canada

There are many ways to generate geometrical models for numerical simulation, and most of them start with a segmentation step to extract the boundaries of the regions of interest. This paper presents an algorithm to generate a patient-specific three-dimensional geometric model, based on a tetrahedral mesh, without an initial extraction of contours from the volumetric data. Using the information directly available in the data, such as gray levels, we built a metric to drive a mesh adaptation process. The metric is used to specify the size and orientation of the tetrahedral elements everywhere in the mesh. Our method, which produces anisotropic meshes, gives good results with synthetic and real MRI data. The resulting model quality has been evaluated qualitatively and quantitatively by comparing it with an analytical solution and with a segmentation made by an expert. Results show that our method gives, in 90% of the cases, as good or better meshes as a similar isotropic method, based on the accuracy of the volume reconstruction for a given mesh size. Moreover, a comparison of the Hausdorff distances between adapted meshes of both methods and ground-truth volumes shows that our method decreases reconstruction errors faster. Copyright (c) 2015John Wiley & Sons, Ltd.

关键词： MRI adaptive mesh refinement 3d geometric model patient-specific

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3d model Hypotheses for Player Segmentation and Rendering in Free-Viewpoint Soccer Video

3D Model Hypotheses for Player Segmentation and Rendering in...

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14th IEEE International Symposium on Multimedia (ISM)

作者： Li, Haopeng Flierl, Markus KTH Royal Inst Technol Sch Elect Engn Stockholm Sweden

ISBN: (纸本)9780769548753

This paper presents a player segmentation approach based on 3d model hypotheses for soccer games. We use a hyperplane model for player modeling and a collection of piecewise geometric models for background modeling. To determine the assignment of each pixel in the image plane, we test it with two model hypotheses. We construct a cost function that measures the fitness of model hypotheses for each pixel. To fully utilize the perspective diversity of the multiview imagery, we propose a three-step strategy to choose the best model for each pixel. The experimental results show that our segmentation approach based on 3d model hypotheses outperforms conventional temporal median and graph cut methods for both subjective and objective evaluation.

关键词： Soccer video segmentation 3d geometric model

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