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1. Experimental analysis of the effects of wrinkles in the radius of curvature of L-shaped carbon-epoxy specimens on unfolding failure

Author:
P. Journoud; C. Bouvet; B. Castanié; L. Ratsifandrihana
Source:
Composites 2022 v.158 pp. 106975
ISSN:
1359-835X
Subject:
digital images,   etc   ; evolution; thermography;     Show all 3 Subjects
Abstract:
... An experimental study has been carried out to describe the evolution of the failure load relative to the maximum misalignment angle of curved carbon–epoxy laminates with out-of-plane wrinkle defects for a large range of misalignments. L-angle specimens with different levels of fibre wrinkling were manufactured and tested in four-point bending tests. Digital Image Correlation (DIC) and infrared the ...
DOI:
10.1016/j.compositesa.2022.106975

2. Effectiveness of Hybrid Fibers on the Fracture and Shear Behavior of Prestressed Concrete Beams

Author:
Chandrashekhar Lakavath; Aniket B. Bhosale; S. Suriya Prakash; Akanshu Sharma
Source:
Fibers 2022 v.10 no.3 pp. -
ISSN:
2079-6439
Subject:
digital images,   etc   ; brittleness; concrete; steel;     Show all 4 Subjects
Abstract:
... This study investigates the effectiveness of hybrid fibers (steel and macro-synthetic) on the shear behavior of prestressed concrete beams. The hybrid fiber combination was selected to avoid workability issues at high volume dosages and ensure effective crack arresting over the crack opening range. Fracture studies included testing notched concrete prisms to identify the role of hybrid fibers in t ...
DOI:
10.3390/fib10030026

3. Chemical Design of Activatable Photoacoustic Probes for Precise Biomedical Applications

Author:
Yongchao Liu; Lili Teng; Baoli Yin; Hongmin Meng; Xia Yin; Shuangyan Huan; Guosheng Song; Xiao-Bing Zhang
Source:
Chemical reviews 2022 v.122 no.6 pp. 6850-6918
ISSN:
1520-6890
Subject:
digital images,   etc   ; acoustics; bioimaging; wills;     Show all 4 Subjects
Abstract:
... Photoacoustic (PA) imaging technology, a three-dimensional hybrid imaging modality that integrates the advantage of optical and acoustic imaging, has great application prospects in molecular imaging due to its high imaging depth and resolution. To endow PA imaging with the ability for real-time molecular visualization and precise biomedical diagnosis, numerous activatable molecular PA probes which ...
DOI:
10.1021/acs.chemrev.1c00875

4. Image-Based Obstacle Detection Methods for the Safe Navigation of Unmanned Vehicles: A Review

Author:
Samira Badrloo; Masood Varshosaz; Saied Pirasteh; Jonathan Li
Source:
Remote Sensing 2022 v.14 no.15 pp. -
ISSN:
2072-4292
Subject:
digital images,   etc   ; cameras; computer science; lighting;     Show all 4 Subjects
Abstract:
... Mobile robots lack a driver or a pilot and, thus, should be able to detect obstacles autonomously. This paper reviews various image-based obstacle detection techniques employed by unmanned vehicles such as Unmanned Surface Vehicles (USVs), Unmanned Aerial Vehicles (UAVs), and Micro Aerial Vehicles (MAVs). More than 110 papers from 23 high-impact computer science journals, which were published over ...
DOI:
10.3390/rs14153824

5. Combining digital image correlation and phased-array ultrasonics for non-destructive testing of translaminar fracture in composite laminates

Author:
Johannes Reiner; Cheng Chen; Reza Vaziri; Anoush Poursartip
Source:
Composites 2022 v.161 pp. 107060
ISSN:
1359-835X
Subject:
digital images,   etc   ; carbon; delamination; polymers; ultrasonics;     Show all 5 Subjects
Abstract:
... A simple and efficient non-destructive testing method is presented to quantify translaminar fracture properties in quasi-isotropic [90/45/0/-45]3s T800SC/3900-2B carbon fibre-reinforced polymer laminates subjected to Over-height Compact Tension (OCT) and Compact Compression (CC) fracture tests. The combination of Digital Image Correlation (DIC) with phased-array ultrasonics enables the consistent ...
DOI:
10.1016/j.compositesa.2022.107060

6. Evaluation of Field Applicability of High-Speed 3D Digital Image Correlation for Shock Vibration Measurement in Underground Mining

Author:
Seunghwan Seo; Younghun Ko; Moonkyung Chung
Source:
Remote Sensing 2022 v.14 no.13 pp. -
ISSN:
2072-4292
Subject:
digital images,   etc   ; cameras; photographs; photography; vibration;     Show all 5 Subjects
Abstract:
... When combined with high-speed photography technology, the digital image correlation (DIC) method provides an excellent photographic image processing capability that can be used to convert the evolving full-field surface properties of structures to sets of two-dimensional (2D) or three-dimensional (3D) coordinate values. In this study, the applicability of the DIC method and high-speed cameras in u ...
DOI:
10.3390/rs14133133

7. Experimental image dataset for validation of the noise-induced bias that affects Digital Image Correlation

Author:
Antonio Baldi; Pietro Maria Santucci; Filippo Bertolino
Source:
Data in Brief 2022 v.42 pp. 108156
ISSN:
2352-3409
Subject:
digital images,   etc   ; data collection; standard deviation;     Show all 3 Subjects
Abstract:
... The present article shares with the scientific community several image sets used for experimentally validating the noise-induced bias on different Digital Image Correlation (DIC) formulations, as reported in Baldi et al. [1]. These sets are provided with a description of the experimental setup used for image acquisition. The basic idea is to acquire a series of images obtained by rigidly translati ...
DOI:
10.1016/j.dib.2022.108156

8. A heterogeneous 3D map-based place recognition solution using virtual LiDAR and a polar grid height coding image descriptor

Author:
Dong Xu; Jingbin Liu; Juha Hyyppä; Yifan Liang; Wuyong Tao
Source:
ISPRS journal of photogrammetry and remote sensing 2022 v.183 pp. 1-18
ISSN:
0924-2716
Subject:
digital images,   etc   ; data collection; lidar; photogrammetry;     Show all 4 Subjects
Abstract:
... Place recognition is widely used for global localization technology. However, the existing place recognition solutions are limited by the requirement for the same type of sensors to be used in both the localization process and the mapping process. Therefore, the existing heterogeneous 3D map cannot be used for place recognition directly with the existing methods, leading to underutilization of inf ...
DOI:
10.1016/j.isprsjprs.2021.10.020

9. Real-Time Localization and Mapping Utilizing Multi-Sensor Fusion and Visual–IMU–Wheel Odometry for Agricultural Robots in Unstructured, Dynamic and GPS-Denied Greenhouse Environments

Author:
Yaxuan Yan; Baohua Zhang; Jun Zhou; Yibo Zhang; Xiao’ang Liu
Source:
Agronomy 2022 v.12 no.8 pp. -
ISSN:
2073-4395
Subject:
digital images,   etc   ; agronomy; algorithms; data collection; greenhouses;     Show all 5 Subjects
Abstract:
... Autonomous navigation in greenhouses requires agricultural robots to localize and generate a globally consistent map of surroundings in real-time. However, accurate and robust localization and mapping are still challenging for agricultural robots due to the unstructured, dynamic and GPS-denied environmental conditions. In this study, a state-of-the-art real-time localization and mapping system was ...
DOI:
10.3390/agronomy12081740

10. A method to evaluate the diameter of carded cotton yarn using image processing and artificial neural networks

Author:
Hiyam Saleh Khaddam; Ghandi Ghazi Ahmad
Source:
The journal of the Textile Institute 2022 v.113 no.8 pp. 1648-1657
ISSN:
1754-2340
Subject:
digital images,   etc   ; algorithms; cotton; fabrics; user interface;     Show all 5 Subjects
Abstract:
... Cotton yarn diameter is an important characteristic that reflects the quality of the yarn to a large extent. In this paper, a new method was proposed to determine the diameter of cotton yarn using digital image processing and artificial neural networks. After processing scanned yarn image, the inputs of ANN were represented by yarn count and the white pixels number of edge detection of processed i ...
DOI:
10.1080/00405000.2021.1943259

11. Experimental characterisation of large in-plane shear behaviour of unidirectional carbon fibre/epoxy prepreg tapes for continuous tow shearing (CTS) process

Author:
Bohao Zhang; Byung Chul Kim
Source:
Composites 2022 v.162 pp. 107168
ISSN:
1359-835X
Subject:
digital images,   etc   ; carbon; carbon fibers; deformation; epoxides; temperature;     Show all 6 Subjects
Abstract:
... The continuous tow shearing (CTS) process is an advanced tape placement technique with the ability to steer unidirectional prepreg tapes by in-plane shear deformation without the presence of tape buckling, gaps and overlaps. However, the inherent fibre misalignment within the tape can induce fibre waviness during the shearing process, which is further affected by processing parameters such as temp ...
DOI:
10.1016/j.compositesa.2022.107168

12. Architecture effects for mode I trans-laminar fracture in over-height compact tension tests: Damage propagation and fracture response

Author:
Tamas Rev; Tzachi Nachman; Ilya Kap; Ofir Shor; Noam Shemesh; David Mollenhauer; Daniel Rittel
Source:
Composites 2022 v.159 pp. 106987
ISSN:
1359-835X
Subject:
digital images,   etc   ; acoustics; carbon; epoxides; micro-computed tomography;     Show all 5 Subjects
Abstract:
... An experimental study was carried out to investigate the effect of material architecture on the damage evolution in carbon/epoxy composites through Overheight Compact Tension (OCT) tests. Four representative lay-ups were designed for both the unidirectional (UD) and woven-based laminates. Interrupted tests were carried out to characterise specimen damage using X-Ray Micro-Computed Tomography. Digi ...
DOI:
10.1016/j.compositesa.2022.106987

13. Characterizing the macroscopic response and local deformation mechanisms of a unidirectional non-crimp fabric

Author:
Mehdi Ghazimoradi; Eleazar A. Trejo; Clifford Butcher; John Montesano
Source:
Composites 2022 v.156 pp. 106857
ISSN:
1359-835X
Subject:
digital images,   etc   ; carbon fibers; deformation; fabrics; polyesters; thermodynamics;     Show all 6 Subjects
Abstract:
... The macroscopic response and local deformation mechanisms of a warp stitched heavy-tow unidirectional non-crimp fabric (UD-NCF) was characterized. Quasi-static uniaxial tests captured the fabric in-plane longitudinal, transverse, and shear deformation response where digital image correlation was employed. The fabric bending response was captured through modified cantilever tests. Off-axis extensio ...
DOI:
10.1016/j.compositesa.2022.106857

14. Experimental simulation study of rockburst characteristics of Sichuan–Tibet granite: A case study of the Zheduoshan tunnel

Author:
Dongqiao Liu; Kai Ling; Changbao Guo; Pengfei He; Manchao He; Jie Sun; Xiaohai Yan
Source:
Engineering geology 2022 v.305 pp. 106701
ISSN:
0013-7952
Subject:
digital images,   etc   ; acoustics; case studies; deformation; granite; railroads;     Show all 6 Subjects
Abstract:
... Rockburst poses a great threat to the construction safety of deep tunnels under high geostress conditions. Recently, numerous deeply buried tunnels have been constructed in China, especially in the Sichuan–Tibet railway area. In this study, two rockburst experiments (strainbursts and impact-induced rockbursts) were conducted under different initial geostresses using the strainburst experimental ap ...
DOI:
10.1016/j.enggeo.2022.106701

15. In situ characterization of the flexural behavior and failure mechanism of 2D needle-punched carbon/carbon composites by digital image correlation

Author:
Hao Xu; Lu Li; Guodong Li; Ruixiao Zheng; Xiyuan Yao; Chaoli Ma
Source:
Journal of materials science 2022 v.57 no.24 pp. 11077-11091
ISSN:
0022-2461
Subject:
digital images,   etc   ; carbon; light microscopy; modulus of rupture;     Show all 4 Subjects
Abstract:
... Combining the load–displacement curve with the In situ strain field evolution obtained by the digital image correlation (DIC), the flexural behavior and failure mechanism of 2D needle-punched carbon/carbon composites under three-point flexural tests were investigated. The carbon/carbon composites showed a typical pseudoplastic mechanical behavior, and the average flexural strength was 137.0 ± 15.5 ...
DOI:
10.1007/s10853-022-07272-y

16. Solute transport characteristics and influencing factors in a coastal unconfined aquifer under tidal action identified by image monitoring in a laboratory experimental setup

Author:
Min Guo; Junwei Wan; Kun Huang
Source:
Hydrogeology journal 2022 v.30 no.3 pp. 989-1004
ISSN:
1431-2174
Subject:
digital images,   etc   ; dispersibility; sea level; solutes; unconfined aquifer;     Show all 5 Subjects
Abstract:
... Studies of solute transport in unconfined coastal aquifers typically neglect oceanic oscillations and assume a static seaward boundary condition defined by the mean annual sea level. In this paper, an image monitoring method is used to establish the quantitative relationship between the concentration of a colored tracer and the hue value of the image. The digital image was used to determine the tr ...
DOI:
10.1007/s10040-022-02476-7

17. Can Mechanical Strain and Aspect Ratio Be Used to Determine Codominant Unions in Red Maple without Included Bark

Author:
Gregory A. Dahle; Robert T. Eckenrode; E. Thomas Smiley; David DeVallance; Ida Holásková
Source:
Forests 2022 v.13 no.7 pp. -
ISSN:
1999-4907
Subject:
digital images,   etc   ; Acer rubrum; arborists; bark; deformation; infrastructure;     Show all 6 Subjects
Abstract:
... Arborists maintain trees in landscapes where failure can cause damage to infrastructure. Codominant branch unions are considered less stable than lateral branch unions. Previous research has found that unions can be considered codominant when aspect ratio is greater than 0.70 when included bark is present, yet it remains unclear if this threshold is reasonable in the absences of included bark. We ...
DOI:
10.3390/f13071007

18. Visualization and monitoring of dynamic damaging–healing processes of polymers by using AIEgen-loaded multifunctional microcapsules

Author:
Shusheng Chen; Ting Han; Junkai Liu; Xinting Liang; Jinglei Yang; Ben Zhong Tang
Source:
Journal of materials chemistry A 2022 v.10 no.29 pp. 15438-15448
ISSN:
2050-7496
Subject:
digital images,   etc   ; chemistry; color; durability; fluorescence; polymers; spectrometers;     Show all 7 Subjects
Abstract:
... The sensitive detection and dynamic monitoring of the structural health of polymers are crucial to increase their quality, reliability, and durability. Although a lot of effort has been devoted to the indication of static damaged and/or healed states of polymers, the simple, sensitive, and real-time monitoring of dynamic damaging–healing processes still remains challenging. In this work, a facile ...
DOI:
10.1039/d2ta02918a

19. Dynamic crack initiation and growth in cellulose nanopaper

Author:
Chengyun Miao; Haishun Du; Xinyu Zhang; Hareesh V. Tippur
Source:
Cellulose 2022 v.29 no.1 pp. 557-569
ISSN:
0969-0239
Subject:
digital images,   etc   ; cellulose; cellulose nanofibers; energy; filtration; mechanical properties;     Show all 6 Subjects
Abstract:
... Cellulose nanopaper (CNP) made of cellulose nanofibrils has gained extensive attention in recent years for its lightweight and superior mechanical properties alongside sustainable and green attributes. The mechanical characterization studies on CNP at the moment have generally been limited to tension tests. In fact, thus far there has not been any report on crack initiation and growth behavior, es ...
DOI:
10.1007/s10570-021-04310-x

20. Refinement of semantic 3D building models by reconstructing underpasses from MLS point clouds

Author:
Olaf Wysocki; Ludwig Hoegner; Uwe Stilla
Source:
International journal of applied earth observation and geoinformation 2022 v.111 pp. 102841
ISSN:
1569-8432
Subject:
digital images,   etc   ; Bayesian theory; data collection; models; spatial data;     Show all 5 Subjects
Abstract:
... Semantic 3D building models are provided by public authorities and can be used in applications, such as urban planning, simulations, navigation, and many others. Since large-scale 3D models are typically derived from top-view digital surface models (DSM), they can have detailed roof structures but render planes for façade elements. Furthermore, buildings’ underpasses are often unmodeled, which imp ...
DOI:
10.1016/j.jag.2022.102841