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strain sensor

Yong Ju Park, Bhupendra K Sharma, Sachin M Shinde, Min-Seok Kim, Bongkyun Jang, Jae-Hyun Kim, Jong-Hyun Ahn
Large-area, ultra-thin flexible tactile sensors with conformal adherence are becoming crucial for advances in wearable electronics, electronic skins and bio-robotics. However, normal passive tactile sensors suffer from high crosstalk, resulting in inaccurate sensing, which consequently, limits their use in such advanced applications. Active-matrix driven tactile sensors could potentially overcome such hurdles but it demands the high performance and reliable operations of the thin-film-transistor array that could efficiently control integrated pressure gauges...
February 15, 2019: ACS Nano
Jiafei Jiang, Jie Luo, Jiangtao Yu, Zhichen Wang
Fiber-reinforced polymer (FRP) has supreme resistance to corrosion and can be designed with optic fibers. FRP can be an alternative to steel reinforcement for concrete structures, and can serve as a sensor for smart concrete structures. Due to poor cracking control and bond performance, the limit of flexural capacity in the serviceability limit state has not been determined, which has obstructed the wider application of FRP bars in smart structures. In this study, in order to overcome these shortcomings, a new engineering cementitious composite (ECC) with superior tensile strain capacity was used to replace the cover around the FRP bars in the tensile zone...
February 5, 2019: Sensors
Jin Wu, Zixuan Wu, Xing Lu, Songjia Han, Bo-Ru Yang, Xuchun Gui, Kai Tao, Jianmin Miao, Chuan Liu
Ionic hydrogels, a class of intrinsically stretchable and conductive materials, are widely used in soft electronics. However, the easy freezing and drying of water-based hydrogels significantly limit their long-term stability. Here, a facile solvent-replacement strategy is developed to fabricate ethylene glycol (Eg)/glycerol (Gl)-water binary anti-freezing and anti-drying organohydrogels for ultrastretchable and sensitive strain sensing within a wide temperature range. Due to the ready formation of strong hydrogen bonds between Eg/Gl and water molecules, the organohydrogels gain exceptional freezing and drying tolerance with retained deformability, conductivity and self-healing ability even stay at extreme temperature for a long time...
February 14, 2019: ACS Applied Materials & Interfaces
Maha Usama Abdelhaseib, Atul K Singh, Arun K Bhunia
AIM: To investigate the use of a light scattering sensor, BARDOT (BActerial Rapid Detection using Optical scattering Technology) coupled with a multi-pathogen selective medium, SEL (Salmonella, Escherichia, and Listeria) for concurrent detection of the three major foodborne pathogens in a single assay. METHODS AND RESULTS: BARDOT was used to detect and distinguish the three major pathogens, Salmonella enterica, Shiga-toxin producing Escherichia coli (STEC) and Listeria monocytogenes from food based on colony scatter signature patterns on SEL agar (SELA)...
February 14, 2019: Journal of Applied Microbiology
Seiichi Takamatsu, Shintaro Goto, Michitaka Yamamoto, Takahiro Yamashita, Takeshi Kobayashi, Toshihiro Itoh
We developed a plastic-scale-model assembly of an ultrathin film piezoresistive microelectromechanical systems (MEMS) strain sensor with a conventional vacuum-suction chip mounter for the application to flexible and wearable strain sensors. A plastic-scale-model MEMS chip consists of 5-μm ultrathin piezoresistive strain sensor film, ultrathin disconnection parts, and a thick outer frame. The chip mounter applies pressure to the ultrathin piezoresistive strain sensor film and cuts the disconnection parts to separate the sensor film from the outer frame...
February 13, 2019: Scientific Reports
Agustina Taglialegna, Maria C Varela, Roberto R Rosato, Adriana E Rosato
Methicillin-resistant Staphylococcus aureus (MRSA) threatens human health in hospital and community settings. The lipopeptide antibiotic daptomycin (DAP) is a frequently used treatment option for MRSA infection. DAP exposure can cause bacterial resistance because mutations are induced in genes implicated in cell membrane and cell wall metabolism. Adaptations aimed at surviving antimicrobial pressure can affect bacterial physiology and modify in vivo aptitude and pathogenesis. In this study, clinical DAP-susceptible (DAPs ) and DAP-resistant (DAPr ) MRSA isolates were used to investigate associations between DAP resistance and staphylococcal virulence...
February 13, 2019: MSphere
Venkadesh Raman, Monssef Drissi-Habti, Preshit Limje, Aghiad Khadour
Designing of new generation offshore wind turbine blades is a great challenge as size of blades are getting larger (typically larger than 100 m). Structural Health Monitoring (SHM), which uses embedded Fiber Optics Sensors (FOSs), is incorporated in critical stressed zones such as trailing edges and spar webs. When FOS are embedded within composites, a 'penny shape' region of resin concentration is formed around the section of FOS. The size of so-formed defects are depending on diameter of the FOS. Penny shape defects depend of FOS diameter...
February 12, 2019: Sensors
Ping Ding, Xin Wang
Conventional sensor structure design and related fracture mechanics analysis are based on the single J -integral parameter approach of elastic-plastic fracture mechanics (EPFM). Under low crack constraint cases, the EPFM one-parameter approach generally gives a stress overestimate, which results in a great cost waste of labor and sensor components. The J-A two-parameter approach overcomes this limitation. To enable the extensive application of the J-A approach on theoretical research and sensor engineering problem, under small scale yielding (SSY) conditions, the authors developed an estimate method to conveniently and quickly obtain the constraint (second) parameter A values directly from T -stress...
February 12, 2019: Sensors
Jia Zhu, Jake J Fox, Ning Yi, Huanyu Cheng
Wireless technology plays a critical role in the development of flexible and stretchable electronics due to the increasing demand for compactness, portability, and level of comfort. As an important candidate in wireless technology, microstrip antennas have recently been explored for flexible and stretchable electronics. However, the stretchable characteristics of the microstrip antenna typically come at a cost of reduced electrical conductivity and radiation efficiency. By utilizing a soft silicone substrate and the structural design of the conventional metallic materials for both patch and ground plane in the microstrip antennas, we have demonstrated two designs of stretchable microstrip antennas: "meshed microstrip antenna" and "arched microstrip antenna"...
February 13, 2019: ACS Applied Materials & Interfaces
Oya Cingöz, Stephen P Goff
Effective host immune responses against viral infection rely on the detection of the virus, activation of downstream signaling pathways, and the secretion of interferons (IFNs) and other cytokines. Many viruses can potently stimulate these responses, whereas the immune response against human immunodeficiency virus type 1 (HIV-1) remains relatively less well characterized. Here we show that HIV-1 infection with reporter viruses does not activate sensing pathways in cell lines and primary cells that are otherwise responsive to foreign nucleic acids...
February 12, 2019: MBio
Jaeyong Lee, Soonjae Pyo, Dae-Sung Kwon, Eunhwan Jo, Wondo Kim, Jongbaeg Kim
Although there have been remarkable improvements in stretchable strain sensors, the development of strain sensors with scalable fabrication techniques and which both high sensitivity and stretchability simultaneously is still challenging. In this work, a stretchable strain sensor based on overlapped carbon nanotube (CNT) bundles coupled with a silicone elastomer is presented. The strain sensor with overlapped CNTs is prepared by synthesizing line-patterned vertically aligned CNT bundles and rolling and transferring them to the silicone elastomer...
February 12, 2019: Small
Takahiro Kanokoda, Yuki Kushitani, Moe Shimada, Jun-Ichi Shirakashi
A human gesture prediction system can be used to estimate human gestures in advance of the actual action to reduce delays in interactive systems. Hand gestures are particularly necessary for human⁻computer interaction. Therefore, the gesture prediction system must be able to capture hand movements that are both complex and quick. We have already reported a method that allows strain sensors and wearable devices to be fabricated in a simple and easy manner using pyrolytic graphite sheets (PGSs). The wearable electronics could detect various types of human gestures with high sensitivity, high durability, and fast response...
February 9, 2019: Sensors
M Chitra, N Pappa
Interest in low cost cellulase production has become a major challenge in recent years for biorefineries. Fed-batch fermentation of Trichoderma strains for the production of low cost cellulase is carried out on complex media that has various soluble and insoluble substrates. The lack of direct estimation of biomass in the presence of insoluble substrates is one of the major concerns for controlling bioprocesses in industries. In this paper, a Multiphase Artificial Neural Network (MANN) based dynamic soft sensor is developed to predict the biomass concentration of Trichoderma during fed batch fermentation in the presence of insoluble substrates...
February 5, 2019: Journal of Microbiological Methods
Run Wang, Zhongsheng Liu, Guoyun Wan, Tianjiao Jia, Chao Zhang, Xuemin Wang, Mei Zhang, Dong Qian, Monica Jung de Andrade, Nan Jiang, Shougen Yin, Rui Zhang, Deqiang Feng, Weichao Wang, Hui Zhang, Hong Chen, Yinsong Wang, Raquel Ovalle-Robles, Kanzan Inoue, Hongbing Lu, Shaoli Fang, Ray H Baughman, Zunfeng Liu
Inflatable conducting devices providing improved properties and functionalities are needed for diverse applications. However, the difficulty in making high-performance inflatable devices is the enabling of two-dimensional (2D) buckles with controlled structures on inflatable catheters. Here, we report the fabrication of highly inflatable devices with controllable structures by wrapping super-aligned carbon nanotube sheet (SACNS) on the pre-inflated catheter. The resulting structure exhibits unique 2D buckled structures including quasi-parallel buckles, crisscrossed buckles, and hierarchically buckled structures, which enables reversible structural changes of 7470% volume strain...
February 8, 2019: ACS Applied Materials & Interfaces
Ednalise Santiago-Cartagena, Sahily González-Crespo, Vladimir Vélez, Nelson Martínez, Jamie Snider, Matthew Jessulat, Hiroyuki Aoki, Zoran Minic, Pearl Akamine, Inoushka Mejías, Luis M Pérez, Brian C Rymond, Mohan Babu, Igor Stagljar, José R Rodríguez-Medina
Wsc1p and Mid2p are transmembrane signaling proteins of cell wall stress in the budding yeast Saccharomyces cerevisiae. When an environmental stress compromises cell wall integrity, they activate a cell response through the Cell Wall Integrity (CWI) pathway. Studies have shown that the cytoplasmic domain of Wsc1p initiates the CWI signaling cascade by interacting with Rom2p, a Rho1-GDP-GTP exchange factor. Binding of Rom2p to the cytoplasmic tail of Wsc1p requires dephosphorylation of specific serine residues but the mechanism by which the sensor is dephosphorylated and how it subsequently interacts with Rom2p remains unclear...
February 7, 2019: G3: Genes—Genomes—Genetics
Simon Langer, Christian Hammer, Kristina Hopfensperger, Lukas Klein, Dominik Hotter, Paul D De Jesus, Kristina M Herbert, Lars Pache, Nikaïa Smith, Johannes A van der Merwe, Sumit K Chanda, Jacques Fellay, Frank Kirchhoff, Daniel Sauter
Many viral pathogens target innate sensing cascades and/or cellular transcription factors to suppress antiviral immune responses. Here, we show that the accessory viral protein U (Vpu) of HIV-1 exerts broad immunosuppressive effects by inhibiting activation of the transcription factor NF-κB. Global transcriptional profiling of infected CD4+ T-cells revealed that vpu -deficient HIV-1 strains induce substantially stronger immune responses than the respective wild type viruses. Gene set enrichment analyses and cytokine arrays showed that Vpu suppresses the expression of NF-κB targets including interferons and restriction factors...
February 5, 2019: ELife
Steffen P Hacker, Florian Schall, Anita Ignatius, Lutz Dürselen
BACKGROUND: Protective knee braces are used for rehabilitation or prevention. Due to poor patient compliance or slippage, the brace might be misaligned with the knee axis. OBJECTIVES: Does a misaligned knee brace stress the anterior cruciate ligament? STUDY DESIGN: It is an experimental study. METHODS: A strain sensor was implanted on the anterior cruciate ligament in eight limbs. The limbs were mounted in a knee simulator, muscle forces were applied and a cyclic motion from 10° to 60° flexion was performed under three conditions: unbraced, braced and with a misaligned brace...
February 4, 2019: Prosthetics and Orthotics International
Zhiyong Xia, Vanessa D Alphonse, Doug B Trigg, Tim P Harrigan, Jeff M Paulson, Quang T Luong, Evan P Lloyd, Meredith H Barbee, Stephen L Craig
Several technologies can be used for measuring strains of soft materials under high rate impact conditions. These technologies include high speed tensile test, split Hopkinson pressure bar test, digital image correlation and high speed X-ray imaging. However, none of these existing technologies can produce a continuous 3D spatial strain distribution in the test specimen. Here we report a novel passive strain sensor based on poly(dimethyl siloxane) (PDMS) elastomer with covalently incorporated spiropyran (SP) mechanophore to measure impact induced strains...
February 1, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Yong Zhao, Jingli Du, Qian Xu, Hong Bao
Environmental loads linked with pointing errors, such as gravity, thermal gradients, and wind disturbances, are a serious concern for large-aperture high-frequency radio telescopes. For the purpose of maintaining the pointing performance of a telescope, a contact measurement scheme is proposed on basis of fiber Bragg grating (FBG) strain sensors that can monitor the sub-reflector shift in real time as the input data of the adjustment system. In this scheme, the relationship between the in situ strain measurement and the deformation of the supporting structure, which is the main cause of sub-reflector shift, is deduced using the inverse Finite Element Method (iFEM)...
February 1, 2019: Sensors
Yu-Jen Wang, Chia-Hsien Chen, Chung-Yang Sue, Wen-Hsien Lu, Yee-Hsuan Chiou
Blood pressure (BP) is a crucial indicator of cardiac health and vascular status. This study explores the relationship between radial artery BP and wrist skin strain. A BP estimation method based on the physical model of wrist skin tissues and pulse wave velocity (PWV) is proposed. A photoplethysmography (PPG) sensor and strain gauge are used in this method. The developed strain-based pulse wave sensor consists of a pressing force sensor, which ensures consistent pressing force, and a strain gauge, which measures the cardiac pulsation on the wrist skin...
October 29, 2018: Micromachines
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