Stretchable Strain Sensors Based on Two- and Three-Dimensional Carbonized Cotton Fabrics for the Detection of Full Range of Human Motions

2021 ◽  
Author(s):  
Xiang He ◽  
Gengzhe Shen ◽  
Jionghong Liang ◽  
Zhihao Liu ◽  
Yue Xin ◽  
...  
Keyword(s):  
Full Range ◽  
Three Dimensional ◽  
Cotton Fabrics ◽  
Strain Sensors ◽  
Human Motions

Carbonized silk georgette as an ultrasensitive wearable strain sensor for full-range human activity monitoring

2017 ◽  
Vol 5 (30) ◽  
pp. 7604-7611 ◽  
Author(s):  
Chunya Wang ◽  
Kailun Xia ◽  
Muqiang Jian ◽  
Huimin Wang ◽  
Mingchao Zhang ◽  
...  
Keyword(s):  
Human Activity ◽  
Full Range ◽  
Strain Sensor ◽  
Activity Monitoring ◽  
Strain Sensors ◽  
Human Motions

Silk georgette based wearable strain sensors are developed, which exhibit outstanding performance and great potential in monitoring full-range human motions.

scholarly journals Network cracks-based wearable strain sensors for subtle and large strain detection of human motions

2018 ◽  
Vol 6 (19) ◽  
pp. 5140-5147 ◽  
Author(s):  
Shuai Wang ◽  
Peng Xiao ◽  
Yun Liang ◽  
Jiawei Zhang ◽  
Youju Huang ◽  
...  
Keyword(s):  
Network Structure ◽  
Large Strain ◽  
Full Range ◽  
Strain Sensors ◽  
Free Standing ◽  
Human Motions ◽  
Strain Detection

Macroscopic multilayer free-standing CNTs films/PDMS composite with cracks in the network structure displays ability for the full-range detection of human motions.

High-Performance Strain Sensors with Fish-Scale-Like Graphene-Sensing Layers for Full-Range Detection of Human Motions

ACS Nano ◽  
2016 ◽  
Vol 10 (8) ◽  
pp. 7901-7906 ◽  
Author(s):  
Qiang Liu ◽  
Ji Chen ◽  
Yingru Li ◽  
Gaoquan Shi
Keyword(s):  
High Performance ◽  
Full Range ◽  
Strain Sensors ◽  
Fish Scale ◽  
Human Motions

scholarly journals Anisotropic, Wrinkled, and Crack-Bridging Structure for Ultrasensitive, Highly Selective Multidirectional Strain Sensors

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Heng Zhang ◽  
Dan Liu ◽  
Jeng-Hun Lee ◽  
Haomin Chen ◽  
Eunyoung Kim ◽  
...  
Keyword(s):  
Rational Design ◽  
Full Range ◽  
Human Motion ◽  
Strain Sensors ◽  
Gauge Factor ◽  
Wearable Electronics ◽  
Trade Off ◽  
Human Motion Detection ◽  
Sensing Applications ◽  
Anisotropic Structures

AbstractFlexible multidirectional strain sensors are crucial to accurately determining the complex strain states involved in emerging sensing applications. Although considerable efforts have been made to construct anisotropic structures for improved selective sensing capabilities, existing anisotropic sensors suffer from a trade-off between high sensitivity and high stretchability with acceptable linearity. Here, an ultrasensitive, highly selective multidirectional sensor is developed by rational design of functionally different anisotropic layers. The bilayer sensor consists of an aligned carbon nanotube (CNT) array assembled on top of a periodically wrinkled and cracked CNT–graphene oxide film. The transversely aligned CNT layer bridge the underlying longitudinal microcracks to effectively discourage their propagation even when highly stretched, leading to superior sensitivity with a gauge factor of 287.6 across a broad linear working range of up to 100% strain. The wrinkles generated through a pre-straining/releasing routine in the direction transverse to CNT alignment is responsible for exceptional selectivity of 6.3, to the benefit of accurate detection of loading directions by the multidirectional sensor. This work proposes a unique approach to leveraging the inherent merits of two cross-influential anisotropic structures to resolve the trade-off among sensitivity, selectivity, and stretchability, demonstrating promising applications in full-range, multi-axis human motion detection for wearable electronics and smart robotics.

Geometrical characterisation of fault arrays in three dimensions

2021 ◽  
Author(s):  
Vincent Roche ◽  
Giovanni Camanni ◽  
Conrad Childs ◽  
Tom Manzocchi ◽  
John Walsh ◽  
...  
Keyword(s):  
Full Range ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Normal Faults ◽  
Fault Geometry ◽  
Surface Geometry ◽  
Fault Surface ◽  
Mechanical Stratigraphy ◽  
Quantitative Basis ◽  
Geometry Analysis

<p>Normal faults are often complex three-dimensional structures comprising multiple sub-parallel segments separated by intact or breached relay zones. In this study we outline geometrical characterisations capturing this 3D complexity and providing a semi-quantitative basis for the comparison of faults and for defining the factors controlling their geometrical evolution. Relay zones are classified according to whether they step in the strike or dip direction and whether the relay zone-bounding fault segments are unconnected in 3D or bifurcate from a single surface. Complex fault surface geometry is then described in terms of the relative numbers of different types of relay zones to allow comparison of fault geometry between different faults and different geological settings. A large database of 87 fault arrays compiled primarily from mapping 3D seismic reflection surveys and classified according to this scheme, reveals the diversity of 3D fault geometry. Analysis demonstrates that mapped fault geometries depend on geological controls, primarily the heterogeneity of the faulted sequence and the presence of a pre-existing structure. For example, relay zones with an upward bifurcating geometry are prevalent in faults that reactivate deeper structures, whereas the formation of laterally bifurcating relays is promoted by heterogeneous mechanical stratigraphy. In addition, mapped segmentation depends on resolution limits and biases in fault mapping from seismic data. In particular, the results suggest that the proportion of bifurcating relay zones increases as data resolution increases. Overall, where a significant number of relay zones are mapped on a single fault, a wide variety of relay zone geometries occurs, demonstrating that individual faults can comprise segments that are both bifurcating and unconnected in three dimensions. Models for the geometrical evolution of fault arrays must therefore account for the full range of relay zone geometries that appears to be a characteristic of all faults.</p>

scholarly journals Reconstruction and Analysis of Tight Sandstone Digital Rock Combined with X-Ray CT Scanning and Multiple-Point Geostatistics Algorithm

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Yun Lei
Keyword(s):  
Pore Space ◽  
Full Range ◽  
Three Dimensional ◽  
Ct Scanning ◽  
Multiple Point ◽  
Tight Sandstone ◽  
Sandstone Sample ◽  
X Ray ◽  
Digital Rock ◽  
Experimental Values

Unconventional rocks such as tight sandstone and shale usually develop multiscale complex pore structures, with dimensions ranging from nanometers to millimeters, and the full range can be difficult to characterize for natural samples. In this paper, we developed a new hybrid digital rock construction approach to mimic the pore space of tight sandstone by combining X-ray CT scanning and multiple-point geostatistics algorithm (MPGA). First, a three-dimensional macropore digital rock describing the macroscopic pore structure of tight sandstone was constructed by micro-CT scanning. Then, high-resolution scanning electron microscopy (SEM) was performed on the tight sandstone sample, and the three-dimensional micropore digital rock was reconstructed by MPGA. Finally, the macropore digital rock and the micropore digital rock were superimposed into the full-pore digital rock. In addition, the nuclear magnetic resonance (NMR) response of digital rocks is simulated using a random walk method, and seepage simulation was performed by the lattice Boltzmann method (LBM). The results show that the full-pore digital rock has the same anisotropy and good connectivity as the actual rock. The porosity, NMR response, and permeability are in good agreement with the experimental values.

High-Performance, Crimped Rayon Fiber

1976 ◽  
Vol 46 (3) ◽  
pp. 184-194 ◽  
Author(s):  
T. E. Muller ◽  
F. P. Barch ◽  
G. C. Daul
Keyword(s):  
Cross Section ◽  
High Performance ◽  
Full Range ◽  
High Strength ◽  
Cotton Fabrics ◽  
Textile Processing ◽  
Fiber Properties ◽  
Spin Bath ◽  
High Degree ◽  
Rayon Fiber

A high-wet-modulus crimped rayon fiber has been developed from a viscose system that utilizes a high-purity wood pulp, relatively low quantities of viscose modifiers, and viscose ripening controlled to allow the spinning of a highly-oriented rayon fiber with an unbalanced cross section. This results in a fiber which develops a high degree of both macro- and microcrimp. Viscose and spin-bath specifications must be rigidly observed, but spinning and fiber-relaxing conditions may be varied to adjust the development of crimp and fiber properties. This fiber performs well on conventional textile-processing equipment and can be spun into the full range of yarn counts that are normally defined by fiber denier. Resulting yarns have the high strength of the high-performance HWM rayons with the bulk and hand of cotton. Fabrics show better cover than that of similar fabrics woven from rayon control samples, and hand and dimensional stability are comparable to those of cotton. This fiber blends well with polyester and shows an advantage in cover over other rayon/polyester blends that are normally quite lean in appearance.

A highly stretchable and transparent silver nanowire/thermoplastic polyurethane film strain sensor for human motion monitoring

2019 ◽  
Vol 6 (11) ◽  
pp. 3119-3124 ◽  
Author(s):  
Runfei Wang ◽  
Wei Xu ◽  
Wenfeng Shen ◽  
Xiaoqing Shi ◽  
Jian Huang ◽  
...  
Keyword(s):  
Silver Nanowires ◽  
Thermoplastic Polyurethane ◽  
Human Motion ◽  
Strain Sensors ◽  
Silver Nanowire ◽  
Transparent Film ◽  
Polyurethane Film ◽  
Highly Stretchable ◽  
Human Motion Monitoring ◽  
Human Motions

Transparent film strain sensors based on silver nanowires and thermoplastic polyurethane are promising candidates for detecting various human motions and monitoring the mass of some kinetic objects.

Frontogenesis and Turbulence: A Numerical Simulation

2016 ◽  
Vol 73 (12) ◽  
pp. 5025-5040 ◽  
Author(s):  
R. M. Samelson ◽  
E. D. Skyllingstad
Keyword(s):  
Numerical Simulation ◽  
Spatial Scales ◽  
Full Range ◽  
Three Dimensional ◽  
Baroclinic Wave ◽  
Surface Drag ◽  
Atmospheric Processes ◽  
Turbulent Transition ◽  
Loss Of Balance ◽  
Shear Instabilities

Abstract A numerical simulation is analyzed that resolves the full range of motions from rotationally dominated, growing baroclinic waves to quasi-isotropic, three-dimensional shear instabilities. The results confirm a 40-yr-old prediction, made by B. Hoskins and F. Bretherton, that frontogenetic collapse of cross-frontal spatial scales, driven by baroclinic-wave deformation fields, will continue to the Kelvin–Helmholtz (K–H) turbulent transition. This process of frontal collapse followed by K–H transition provides a mechanism for spontaneous loss of balance in an initially geostrophic flow, and a direct, spectrally nonlocal pathway for downscale energy transfer that is phenomenologically distinct from traditional concepts of turbulent cascades and can contribute substantially to total kinetic energy dissipation. These results, which neglect surface drag and several other potentially relevant atmospheric processes, would suggest that the turbulence associated with collapsing fronts in the atmosphere can extend upward from the surface through roughly one-third of the troposphere.

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