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Flexible sensor

Ernesto Cuartas Morales, Carlos D Acosta-Medina, German Castellanos-Dominguez, Dante Mantini
Accurate source localization of electroencephalographic (EEG) signals requires detailed information about the geometry and physical properties of head tissues. Indeed, these strongly influence the propagation of neural activity from the brain to the sensors. Finite difference methods (FDMs) are head modelling approaches relying on volumetric data information, which can be directly obtained using magnetic resonance (MR) imaging. The specific goal of this study is to develop a computationally efficient FDM solution that can flexibly integrate voxel-wise conductivity and anisotropy information...
October 19, 2018: Brain Topography
Wei Qi, Wei Liu, Xuxun Liu, Anfeng Liu, Tian Wang, Neal N Xiong, Zhiping Cai
Software defined networks brings greater flexibility to networks and therefore generates new vitality. Thanks to the ability to update soft code to sensor nodes, wireless sensor networks (WSNs) brings profound changes to Internet of Things. However, it is a challenging issue to minimize delay and transmission times and maintain long lifetime when broadcasting data packets in high loss ratio and low duty cycle WSNs. Although there have been some research concerning code dissemination, those schemes can only achieve a tradeoff between different performances, instead of optimizing all these important performances at the same time...
October 18, 2018: Sensors
Ning Ma, Lisa G Lippert, Titu Devamani, Benjamin Levy, Sangbae Lee, Manbir Sandhu, Nagarajan Vaidehi, Sivaraj Sivaramakrishnan
Protein kinases achieve substrate selective phosphorylation through their conformation flexibility and dynamic interaction with substrate. Designing substrate selective or kinase selective small molecule inhibitors remains a challenge due to a lack of understanding of the dynamic mechanism by which substrates are selected by the kinase. Using a combination of all-atom MD simulations and FRET sensors, we have delineated an allosteric mechanism that results in interaction between the DFG motif, G-loop, and activation loop and structurally link the nucleotide and substrate binding interfaces in PKCα and three other Ser/Thr kinases...
October 19, 2018: Biochemistry
Yassine Rabhi, Makrem Mrabet, Farhat Fnaiech
BACKGROUND AND OBJECTIVES: In order to improve assistive technologies for people with reduced mobility, this paper develops a new intelligent real-time emotion detection system to control equipment, such as electric wheelchairs (EWC) or robotic assistance vehicles. Every year, degenerative diseases and traumas prohibit thousands of people to easily control the joystick of their wheelchairs with their hands. Most current technologies are considered invasive and uncomfortable such as those requiring the user to wear some body sensor to control the wheelchair...
October 2018: Computer Methods and Programs in Biomedicine
Zengyao Wang, Bin Ai, Ziwei Zhou, Yuduo Guan, Helmuth Möhwald, Gang Zhang
Hollow nanocone array (HNCA) films (cm × cm), composed of two Ag and Au nanoshells, are fabricated via a low-cost and efficient colloidal lithography technique. The relative position of the Ag and Au nanoshells can be controlled to generate various chiral asymmetries. A pronounced chiroptical response is observed in the ultraviolet-visible region with the anisotropy factor up to 10-1, which is rooted in the asymmetric current oscillations and electric field distributions. Beyond previous reports on plasmonic chiral metamaterials, the HNCA can be free-standing and further transferred to other functional and flexible substrates, e...
October 18, 2018: ACS Nano
Tao Chen, Qiongfeng Shi, Minglu Zhu, Tianyiyi He, Lining Sun, Lei Yang, Chengkuo Lee
Triboelectric nanogenerators and sensors can be applied as human-machine interfaces to the next generation of intelligent and interactive products, where flexible tactile sensors exhibit great advantages for diversified applications such as robotic control. In this paper, we present a self-powered, flexible, triboelectric sensor (SFTS) patch for finger trajectory sensing and further apply the collected information for robotic control. This innovative sensor consists of flexible and environmentally friendly materials, i...
October 18, 2018: ACS Nano
Hong Seok Jo, Hyuk-Jin Kwon, Tae-Gun Kim, Chan-Woo Park, Seongpil An, Alexander L Yarin, Sam S Yoon
Electrospun metal-plated nanofibers and supersonically sprayed nanowires were used to fabricate hybrid films exhibiting a superior low sheet resistance of 0.18 Ω sq-1, a transparency of 91.1%, and a figure-of-merit of 2.315 Ω-1. The films are suitable to serve as thermal sensors and heaters. Such hybrid transparent conducting films are highly flexible and thus wearable. They can be used as body-temperature monitors and heaters. The employed hybrid approach improved the sheet resistance diminishing it to a minimum, while maintaining transparency...
October 18, 2018: Nanoscale
Miguel Aguilera, Manuel G Bedia
The activity of many biological and cognitive systems is not poised deep within a specific regime of activity. Instead, they operate near points of critical behavior located at the boundary between different phases. Certain authors link some of the properties of criticality with the ability of living systems to generate autonomous or intrinsically generated behavior. However, these claims remain highly speculative. In this paper, we intend to explore the connection between criticality and autonomous behavior through conceptual models that show how embodied agents may adapt themselves toward critical points...
2018: Frontiers in Neurorobotics
Lingxiao Gao, Donglin Hu, Mengke Qi, Jia Gong, Hong Zhou, Xin Chen, Junfei Chen, Jing Cai, Liangke Wu, Ning Hu, Ya Yang, Xiaojing Mu
Triboelectric nanogenerators (TENGs) have been in spotlight for their excellent capability to drive miniature electronics. Herein, we report a sophisticated double-helix-structured triboelectric nanogenerator (DHS-TENG) enhanced with positive charge traps for self-powered temperature sensing and smart-home control system. The DHS-TENG increases the charge density on the contact surfaces by taking advantage of the ferroelectric characteristics of polyvinylidene fluoride (PVDF). In addition, the flexible double-helix-structure endows DHS-TENG with excellent elastic property as it has no external supporting materials...
October 17, 2018: Nanoscale
Asif Khan, Faisal Raza Khan, Heung Soo Kim
Electro-active paper (EAPap) is a cellulose-based smart material that has shown promising results in a variety of smart applications (e.g., vibration sensor, piezo-speaker, bending actuator) with the merits of being flexible, lightweight, fracture tolerant, biodegradable, naturally abundant, cheap, biocompatible, and with the ability to form hybrid nanocomposites. This paper presents a review of the characterization and application of EAPap as a flexible mechanical vibration/strain sensor, bending actuator, and vibration energy harvester...
October 15, 2018: Sensors
Baoyun Sun, Pengbin Wang, Jian Luo, Jinjun Deng, Shiqi Guo, Binghe Ma
A flexible hot-film sensor array for wall shear stress, flow separation, and transition measurement has been fabricated and implemented in experiments. Parylene C waterproof layer is vapor phase deposited to encapsulate the sensor. Experimental studies of shear stress and flow transition on a flat plate have been undertaken in a water tunnel with the sensor array. Compared with the shear stress derived from velocity profile and empirical formulas, the measuring errors of the hot-film sensors are less than 5%...
October 15, 2018: Sensors
Chao Zhuang, Yifan Xu, Ningsheng Xu, Jinxiu Wen, Huanjun Chen, Shaozhi Deng
Plasmonic gold nanorods play important roles in nowadays state-of-the-art plasmonic sensing techniques. Most of the previous studies and applications focused on gold nanorods with relatively small aspect ratios, where the plasmon wavelengths are smaller than 900 nm. Gold nanorods with large aspect ratios are predicted to exhibit high refractive-index sensitivity (Langmir 2008, 24, 5233⁻5237), which therefore should be promising for the development of high-performance plasmonic chemical- and bio-sensors. In this study, we developed gold nanorods with aspect ratios over 7...
October 15, 2018: Sensors
Yuanhong Xu, Tao Chen, Jing Sun, Jingquan Liu
Based on the flexible molecular engineering technique of reversible addition-fragmentation chain transfer (RAFT) polymerization, various polymers carrying positive or negative charges and different terminal groups such as pyrene or tertiary amine were synthesized for fabricating multifunctional solid-state electrochemiluminescent (ECL) sensors. Accordingly, the chemosensors immobilizing the ECL probe or co-immobilizing the ECL probe and the coreactant were realized for the quantification of small molecules (e...
December 18, 2018: Analytica Chimica Acta
Donghyeon Ryu, Alfred Mongare
In this study, a flexible strain sensor is devised using corrugated bilayer thin films consisting of poly(3-hexylthiophene) (P3HT) and poly(3,4-ethylenedioxythiophene)-polystyrene(sulfonate) (PEDOT:PSS). In previous studies, the P3HT-based photoactive non-corrugated thin film was shown to generate direct current (DC) under broadband light, and the generated DC voltage varied with applied tensile strain. Yet, the mechanical resiliency and strain sensing range of the P3HT-based thin film strain sensor were limited due to brittle non-corrugated thin film constituents...
October 13, 2018: Materials
Juan Carlos Torres, Braulio García-Cámara, Isabel Pérez, Virginia Urruchi, José Manuel Sánchez-Pena
Wireless communication is growing quickly and now allows technologies like the Internet of Things (IoT). It is included in many smart sensors helping to reduce the installation and system costs. These sensors increase flexibility, simplify deployment and address a new set of applications that was previously impossible with a wired approach. In this work, a wireless temperature sensor based on a nematic liquid crystal as variable capacitance is proposed as a proof of concept for potential wearable applications...
October 12, 2018: Sensors
Vaclav Kremen, Benjamin H Brinkmann, Inyong Kim, Hari Guragain, Mona Nasseri, Abigail L Magee, Tal Pal Attia, Petr Nejedly, Vladimir Sladky, Nathanial Nelson, Su-Youne Chang, Jeffrey A Herron, Tom Adamski, Steven Baldassano, Jan Cimbalnik, Vince Vasoli, Elizabeth Fehrmann, Tom Chouinard, Edward E Patterson, Brian Litt, Matt Stead, Jamie Van Gompel, Beverly K Sturges, Hang Joon Jo, Chelsea M Crowe, Timothy Denison, Gregory A Worrell
Brain stimulation has emerged as an effective treatment for a wide range of neurological and psychiatric diseases. Parkinson's disease, epilepsy, and essential tremor have FDA indications for electrical brain stimulation using intracranially implanted electrodes. Interfacing implantable brain devices with local and cloud computing resources have the potential to improve electrical stimulation efficacy, disease tracking, and management. Epilepsy, in particular, is a neurological disease that might benefit from the integration of brain implants with off-the-body computing for tracking disease and therapy...
2018: IEEE Journal of Translational Engineering in Health and Medicine
Wen Wang, He Yang, Min Zhang, Zhanfeng Chen, Guang Shi, Keqing Lu, Kui Xiang, Bingfeng Ju
A spherical joint is a commonly used mechanical hinge with the advantages of compact structure and good flexibility, and it becomes a key component in many types of equipment, such as parallel mechanisms, industrial robots, and automobiles. Real-time detection of a precision spherical joint clearance is of great significance in analyzing the motion errors of mechanical systems and improving the transmission accuracy. This paper presents a novel method for the micro-clearance measurement with a spherical differential capacitive sensor (SDCS)...
October 9, 2018: Sensors
Luigi Tesio, Chiara Malloggi, Calogero Malfitano, Carlo A Coccetta, Luigi Catino, Viviana Rota
Walking on a split-belt treadmill (each of the two belts running at a different speed) has been proposed as an experimental paradigm to investigate the flexibility of the neural control of gait and as a form of therapeutic exercise. However, the scarcity of dynamic investigations challenges the validity of the available findings. The aim of the present study was to investigate the dynamic asymmetries of lower limbs of healthy adults during adaptation to gait on a split-belt treadmill. Ten healthy adults walked on a split-belt treadmill mounted on force sensors, with belts running either at the same speed ('tied' condition) or at different speeds ('split' condition, 0...
October 9, 2018: International Journal of Rehabilitation Research. Revue Internationale de Recherches de Réadaptation
Gongjin Li, Enming Song, Gaoshan Huang, Ruobing Pan, Qinglei Guo, Fei Ma, Bin Zhou, Zengfeng Di, YongFeng Mei
Flexible transient photodetectors, a form of optoelectronic sensors that can be physically self-destroyed in a controllable manner, could be one of the important components for future transient electronic systems. In this work, a scalable, device-first, and bottom-up thinning process enables the fabrication of a flexible transient phototransistor on a wafer-compatible transferred silicon nanomembrane. A gate modulation significantly restrains the dark current to 10-12 A. With full exposure of the light-sensitive channel, such a device yields an ultrahigh photo-to-dark current ratio of 107 with a responsivity of 1...
October 10, 2018: Small
Hiroyuki Kai, Yuto Kato, Ryoma Toyosato, Matsuhiko Nishizawa
Sensing of lactate in perspiration provides a way to monitor health and control exercise. The volume of perspiration is miniscule, and the efficient collection of perspiration is desired for its effective sensing. We developed mesh-type enzymatic electrodes fabricated on textile meshes and integrated the meshes into an enzymatic biofuel cell. We tested them as self-powered lactate sensors for a small volume of lactate solution. A fluid-permeable enzymatic anode was fabricated based on an insulating textile mesh that was coated with carbon nanotubes (CNTs) and lactate oxidase...
October 10, 2018: Analyst
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