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strain sensor

Nanoparticles Zeeshan, K S Daya, Prem Saran Tirumalai, Evangelyn Alocilja
In this paper, we used the distinguishable surface charge and mass of different bacterial strains for label free detection and differentiation of pathogen through impedance and magnetohydrodynamic analysis. For isolation of Escherichia coli and Staphylococcus aureus, functionalized magnetic nanoparticles (MNPs) were used. Proposed method is aimed at minimizing extensive chemical preparation and labour intensive conventional microbiological processing thereby reducing the detection time. Pathogens isolated from broth cultures using MNPs were subjected to impedance rate measurement through an arduino based automated impedance sensor along with differentiation on the basis of Larmor's motion through Magnetohydrodynamic (MHD) approach...
August 13, 2018: IEEE Transactions on Nanobioscience
Yooil Kim, Ji-Sik Kim, Gi-Woo Kim
This study presents the initial assessment for a new approach to frequency selectivity aimed at mimicking the function of the basilar membrane within the human cochlea. The term cochlea tonotopy refers to the passive frequency selectivity and a transformation from the acoustic wave into a frequency signal assisted by the hair cells in the organ of Corti. While high-frequency sound waves vibrate near the base of the cochlea (near the oval windows), low-frequency waves vibrate near the apex (at the maximum distance from the base), which suggests the existence of continuous frequency selectivity...
August 13, 2018: Scientific Reports
Sheng Shen, Shao-Fei Jiang
Distributed deformation based on fiber Bragg grating sensors or other kinds of strain sensors can be used to monitor bridges during operation. However, most research on distributed deformation monitoring has focused on solid rectangular beams rather than box girders-a kind of typical hollow beam widely employed in actual bridges. The deformation of a single-cell box girder contains bending deflection and also two additional deformations respectively caused by shear lag and shearing action. This paper revises the improved conjugated beam method (ICBM) based on the long-gage fiber Bragg grating (LFBG) sensors to satisfy the requirements for monitoring the two additional deformations in a single-cell box girder...
August 8, 2018: Sensors
Jian Zhou, You-Lo Hsieh
Strong and highly conductive aerogels have been assembled from cellulose nanofibrils (CNFs) protonated with conductive poly(3,4-ethylene dioxythiophene)/poly(styrene sulfonate) (PEDOT/PSS) complex at equal mass or less. Protonating CNF surface carboxylates and hydrogen-bonding CNF surface carboxyls with PSS in PEDOT/PSS generated PEDOT/PSS/CNF aerogels that were up to ten times stronger while as conductive as neat PEDOT/PSS aerogel, attributed to the transformation of PEDOT benzoid structure to the more electron transfer-preferred quinoid structure...
August 9, 2018: ACS Applied Materials & Interfaces
Peng Wang, Zhiwei Peng, Muxiao Li, YuHuang Wang
Flexible transparent conductors are an enabling component for large-area flexible displays, wearable electronics, and implantable medical sensors that can wrap around and move with the body. However, conventional conductive materials decay quickly under tensile strain, posing a significant hurdle for functional flexible devices. Here, we show that high electrical conductivity, mechanical stretchability, and optical transparency can be simultaneously attained by compositing long metallic double-walled carbon nanotubes with a polydimethylsiloxane substrate...
August 9, 2018: Small
Alexander Ritz Mait, Jason Lee Forman, Bingbing Nie, John Paul Donlon, Adwait Mane, Ali Reza Forghani, Robert B Anderson, M Truitt Cooper, Richard W Kent
Background: Forced external rotation of the foot is a mechanism of ankle injuries. Clinical observations include combinations of ligament and osseous injuries, with unclear links between causation and injury patterns. By observing the propagation sequence of ankle injuries during controlled experiments, insight necessary to understand risk factors and potential mitigation measures may be gained. Hypothesis: Ankle flexion will alter the propagation sequence of ankle injuries during forced external rotation of the foot...
June 2018: Orthopaedic Journal of Sports Medicine
Svenja Ratjens, Samuel Mortensen, Antje Kumpf, Melanie Bartsch, Traud Winkelmann
Cyclamen persicum is an ornamental plant with economic relevance in many parts of the world. Moreover, it can be regarded as an applied model for somatic embryogenesis, since transcriptomic, proteomic, and metabolomic comparisons have revealed insights into this regeneration process on the molecular level. To enable gene function analyses, the aim of this study was to establish an efficient Agrobacterium tumefaciens -mediated genetic transformation protocol for C. persicum . For the first time, embryogenic callus cultures were used as a target material...
2018: Frontiers in Plant Science
Dongdong Chen, Linsheng Huo, Hongnan Li, Gangbing Song
A washer is a common structural element that is directly used along the loading path of a bolted connection. Pre-load on a bolted connection directly impacts its load bearing capacity and pre-load monitoring is an important aspect of structural health monitoring (SHM). With the change of the pre-load on a bolted connection, the loading force on the washer will change and, therefore, the outer diameter and outer circumferential length of the washer will change. Taking advantage of the high sensitivity and the small size of a Fiber Bragg Grating (FBG) sensor, we propose an innovative smart washer encircled by an FBG sensor that can directly measure the circumferential strain change and, therefore, the pre-load on the washer...
August 7, 2018: Sensors
Hu Sun, Yishou Wang, Xinlin Qing, Zhanjun Wu
As one of the most common transducers used in structural health monitoring (SHM), piezoceramic sensors can play an important role in both damage detection and impact monitoring. However, the low tensile strain survivability of piezoceramics resulting from the material nature significantly limits their application on SHM in the aerospace industry. This paper proposes a novel approach to greatly improve the strain survivability of piezoceramics by optimal design of the adhesive used to bond them to the host structure...
August 4, 2018: Sensors
Olena G Stasyk, Iryna O Denega, Dzmitry Padhorny, Kostyantyn V Dmytruk, Dima Kozakov, Charles Abbas, Oleh V Stasyk
The HpGcr1, a hexose transporter homologue from the methylotrophic yeast Hansenula (Ogataea) polymorpha, was previously identified as being involved in glucose repression. Intriguingly, potential HpGcr1 orthologues are found only in the genomes of a few yeasts phylogenetically closely related to H. polymorpha, but are absent in all other yeasts. The other closest HpGcr1 homologues are fungal high-affinity glucose symporters or putative transceptors suggesting a possible HpGcr1 origin due to a specific archaic gene retention or via horizontal gene transfer from Eurotiales fungi...
August 3, 2018: International Journal of Biochemistry & Cell Biology
Nader Shehata, Ishac Kandas, Ibrahim Hassounah, Patrik Sobolčiak, Igor Krupa, Miroslav Mrlik, Anton Popelka, Jesse Steadman, Randolph Lewis
This work presents electrospun nanofibers from synthetic spider silk protein, and their application as both a mechanical vibration and humidity sensor. Spider silk solution was synthesized from minor ampullate silk protein (MaSp) and then electrospun into nanofibers with a mean diameter of less than 100 nm. Then, mechanical vibrations were detected through piezoelectric characteristics analysis using a piezo force microscope and a dynamic mechanical analyzer with a voltage probe. The piezoelectric coefficient ( d 33 ) was determined to be 3...
August 1, 2018: Nanomaterials
Jinzhu Zhou, Zhiheng Cai, Pengbing Zhao, Baofu Tang
This paper investigates the problem of an optimal sensor placement for better shape deformation sensing of a new antenna structure with embedded or attached Fiber Bragg grating (FBG) strain sensors. In this paper, the deformation shape of the antenna structure is reconstructed using a strain⁻displacement transformation, according to the measured discrete strain data from limited FBG strain sensors. Moreover, a two-stage sensor placement method is proposed using a derived relative reconstruction error equation...
August 1, 2018: Sensors
Hao Liu, Moxiao Li, Cheng Ouyang, Tian Jian Lu, Fei Li, Feng Xu
The ever-growing overlap between stretchable electronic devices and wearable healthcare applications is igniting the discovery of novel biocompatible and skin-like materials for human-friendly stretchable electronics fabrication. Amongst all potential candidates, hydrogels with excellent biocompatibility and mechanical features close to human tissues are constituting a promising troop for realizing healthcare-oriented electronic functionalities. In this work, based on biocompatible and stretchable hydrogels, a simple paradigm to prototype stretchable electronics with an embedded three-dimensional (3D) helical conductive layout is proposed...
July 30, 2018: Small
Lingzhi Li, Yunhua Wang, Zongtan Wang, Yu-Lan Liu, Biao Wang
Quantum spin Hall insulator, i.e., topological insulator (TI), is a natural candidate for low-power electronics and spintronics because of its intrinsic dissipationless feature. Recent density functional theory and scanning tunnelling spectroscopy experiment show that the mechanical strain allows dynamic, continuous and reversible modulations of the topological surface states within the topological phase, and hence opens prospects for TI straintronics. Here, we combine together the mechanical strain and the giant magnetoresistance (GMR) of a ferromagnet-TI (FM-TI) junction to construct a novel TI GMR straintronics device...
July 30, 2018: ACS Applied Materials & Interfaces
Yichao Yang, Siqi Guo, Zhili Hao
This is the first study to measure the viscoelastic behavior of tumor tissues using stepwise compression-relaxation testing, and investigate the measured (Δσ-ε) relation between stress drop (Δσ) and applied strain (ε) as a biomarker for tumor detection. Stepwise compression-relaxation testing was implemented via a 2D tactile sensor to measure stress drop at each applied strain of a sample. Pearson correlation analysis was conducted to quantify the measured Δσ-ε relation as slope of stress drop versus applied strain (m=Δσ/ε) and coefficient of determination (R2 )...
July 17, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Evgenia Gilshteyn, Shaoting Lin, Vladislav Kondrashov, Daria Kopylova, Alexey Tsapenko, Anton Anisimov, A John Hart, Xuanhe Zhao, Albert G Nasibulin
Electrically conductive hydrogels (ECHs) are attracting much interest in the field of biomaterial science due to their unique properties. However, effective incorporation and dispersion of conductive materials in the matrices of polymeric hydrogels for improved conductivity remains a great challenge. Here, we demonstrate highly transparent, electrically conductive, stretchable tough hydrogels modified by single-walled carbon nanotubes (SWCNTs). Two different approaches for the fabrication of SWCNT/hydrogel structures are examined: a simple SWCNT film transfer onto the as-prepared hydrogel and the film deposition onto the pre-stretched hydrogel...
July 27, 2018: ACS Applied Materials & Interfaces
Jianjun Zhang, Weidong Liu, Li'e Gao, Yiwen Zhang, Weijiang Tang
This paper proposes a novel underwater dexterous hand structure whose fingertip is equipped with underwater tactile force sensor (UTFS) array to realize the grasping sample location determination and force perception. The measurement structure, theoretical analysis, prototype development and experimental verification of the UTFS are purposefully studied in order to achieve accurate measurement under huge water pressure influence. The UTFS is designed as capsule shape type with differential pressure structure, and the external water pressure signal is separately transmitted to the silicon cup bottom which is considered to be an elastomer with four strain elements distribution through the upper and lower flexible contacts and the silicone oil filled in the upper and lower cavities of UTFS...
July 26, 2018: Sensors
Chengwei Li, Dongmei Zhang, Chenghao Deng, Peng Wang, Yunping Hu, Yuezhen Bin, Zeng Fan, Lujun Pan
A high-performance strain sensor based on buckypaper has been fabricated and studied. The sensor with an ultrahigh gauge factor of 20 216 can detect a maximum and a minimum strain range of 75% and 0.1%, respectively. During stretching, the strain sensor achieves a high stability and reproducibility of 10 000 cycles, and a fast response time of less than 87 ms. On the other hand, the sensor shows an excellent sensing performance upon pressure. The pressure range, pressure sensitivity and loading-unloading cycles are 0-1...
August 9, 2018: Nanoscale
Yan Wang, Shu Gong, Daniel Gómez, Yunzhi Ling, Lim Wei Yap, George P Simon, Wenlong Cheng
We report on unconventional Janus material properties of vertically aligned gold nanowire films that conduct electricity and interact with light and water in drastically different ways on its two opposing sides. These Janus-like properties originate from enokitake-like nanowire structures, causing the nanoparticle side ("head") to behave like bulk gold, yet the opposing nanowire side ("tail") behaves as discontinuous nanophases. Due to this Janus film structure, its head side is hydrophilic but its tail side is hydrophobic; its head side reflects light like bulk gold, yet its tail side is a broadband superabsorber; its tail side is less conductive but with tunable resistance...
July 26, 2018: ACS Nano
Jin Ho Lee, Yu Ra Jeong, Geumbee Lee, Sang Woo Jin, Yong Hui Lee, Soo Yeong Hong, Heun Park, Jung Wook Kim, Sang-Soo Lee, Jeong Sook Ha
Here, we report on a highly conductive, stretchable, and transparent electrode of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) fabricated via modification with triblock copolymer, poly(ethylene glycol)- block-poly(propylene glycol)- block-poly(ethylene glycol) (PEO20 -PPO70 -PEO20 , Pluronic P123), and post-treatment with sulfuric acid. The fabricated electrode exhibits high transparency (89%), high electrical conductivity (∼1700 S/cm), and minimal change in resistance (∼4%) under repetitive stretch-release cycles at 40% tensile strain after stabilization...
August 9, 2018: ACS Applied Materials & Interfaces
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