70,623 results match your criteria Sensors Basel Switzerland[Journal]


Enhanced superoxide sensitivity in organic field-effect transistor sensors by introducing nanoclay-polyphenol-polymer hybrid sensing channels.

J Hazard Mater 2019 Apr 2;374:159-166. Epub 2019 Apr 2.

Organic Nanoelectronics Laboratory and KNU Institute for Nanophotonics Applications (KINPA), Department of Chemical Engineering, School of Applied Chemical Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea. Electronic address:

Here we report that nanoclay-polyphenol-polymer hybrid sensing channels can greatly enhance the sensitivity for hazardous reactive oxygen species (ROS) in organic field-effect transistor (OFET) sensors. The hybrid layers were prepared by introducing nanoclay into the binary mixtures of poly(3-hexylthiophene) (P3HT) and rutin (a polyphenol) at various weight ratios. The presence of nanoclay improved the P3HT crystallinity in the hybrid films, which contributed to the increased drain current and well-maintained hole mobility even at the reduced amount of charge-transporting P3HT part. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.jhazmat.2019.04.013DOI Listing

Maneuvering Target Tracking With Event-Based Mixture Kalman Filter in Mobile Sensor Networks.

IEEE Trans Cybern 2019 Apr 17. Epub 2019 Apr 17.

In this paper, the distributed remote state estimation problem for conditional dynamic linear systems in mobile sensor networks with an event-triggered mechanism is investigated. The distributed mixture Kalman filtering method is proposed to track the state of the maneuvering target, which uses particle filtering to estimate the nonlinear variables and apply Kalman filtering to estimate the linear variables. An event-based distributed filtering scheme is designed, which is an energy-efficient way to transmit data between sensors and estimators. Read More

View Article

Download full-text PDF

Source
https://ieeexplore.ieee.org/document/8693671/
Publisher Site
http://dx.doi.org/10.1109/TCYB.2019.2901515DOI Listing
April 2019
1 Read

Low-Light Image Enhancement via a Deep Hybrid Network.

IEEE Trans Image Process 2019 Apr 16. Epub 2019 Apr 16.

Camera sensors often fail to capture clear images or videos in a poorly-lit environment. In this paper, we propose a trainable hybrid network to enhance the visibility of such degraded images. The proposed network consists of two distinct streams to simultaneously learn the global content and salient structures of the clear image in a unified network. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1109/TIP.2019.2910412DOI Listing

A Riemannian geometry approach to reduced and discriminative covariance estimation in Brain Computer Interfaces.

IEEE Trans Biomed Eng 2019 Apr 18. Epub 2019 Apr 18.

Objective: Spatial covariance matrices are extensively employed as brain activity descriptors in BCI research that, typically, involve the whole array of sensors. Here, we introduce a methodological framework for delineating the subset of sensors, the covariance structure of which offers a reduced, but more powerful, representation of brain's coordination patterns that ultimately leads to reliable mind reading.

Methods: Adopting a Riemannian geometry approach, we turn the problem of sensor selection as a maximization of a functional that is computed over the manifold of symmetric positive definite (SPD) matrices and encapsulates class separability in a way that facilitates the search among subsets of different size. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1109/TBME.2019.2912066DOI Listing
April 2019
1 Read

Fabrication of a Luminescence-Silent System Based on a Post-Synthetic Modification Cd-MOFs: A Highly Selective and Sensitive Turn-on Luminescent Probe for Ascorbic Acid Detection.

Inorg Chem 2019 Apr 18. Epub 2019 Apr 18.

Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering , Inner Mongolia University , Hohhot 010021 , China.

A unique three-dimensional luminescent metal-organic framework (Cd-MOFs), [Cd(tpbpc)]·2HO·DMF (Htpbpc = 4'-[4,2';6',4″]-terpyridin-4'-yl-biphenyl-4-carboxylic acid; DMF = dimethylformamide), was synthesized and structurally characterized; it exhibits excellent luminescent property and structural stability in aqueous solutions. Interestingly, an unparalleled luminescence-silent system CrO@Cd-MOFs was successfully fabricated by postsynthetic modification of metal-organic frameworks. This luminescence-silent system represents a highly selective and sensitive turn-on luminescent responding to ascorbic acid. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1021/acs.inorgchem.9b00420DOI Listing

Biomimetic Water-responsive Self-healing Epoxy with Tunable Properties.

ACS Appl Mater Interfaces 2019 Apr 18. Epub 2019 Apr 18.

As dynamic crosslinking networks are intrinsically weaker than permanent covalent networks, it is a big challenge to obtain a stiff self-healing polymer using reversible networks. Inspired by the self-healable and mechanically adaptive nature of sea cucumber, we design a water-responsive self-healing polymer system with reversible and permanent covalent networks by crosslinking polypropylene glycol with boroxine and epoxy. This double crosslinked structure is self-healing due to the boroxine reversible network as well as showing room-temperature tensile modulus of 1059 MPa and tensile stress of 37 MPa, on a par with classic thermosets. Read More

View Article

Download full-text PDF

Source
http://pubs.acs.org/doi/10.1021/acsami.9b04249
Publisher Site
http://dx.doi.org/10.1021/acsami.9b04249DOI Listing
April 2019
1 Read

Wearable Sensors Reveal Menses-Driven Changes in Physiology and Enable Prediction of the Fertile Window: Observational Study.

J Med Internet Res 2019 Apr 18;21(4):e13404. Epub 2019 Apr 18.

Department of Reproductive Endocrinology, University Hospital, Zurich, Switzerland.

Background: Previous research examining physiological changes across the menstrual cycle has considered biological responses to shifting hormones in isolation. Clinical studies, for example, have shown that women's nightly basal body temperature increases from 0.28 to 0. Read More

View Article

Download full-text PDF

Source
http://www.jmir.org/2019/4/e13404/
Publisher Site
http://dx.doi.org/10.2196/13404DOI Listing
April 2019
1 Read

Longitudinal Changes in Muscle Mass and Function in Older Men at Increased Risk for Sarcopenia - The FrOST-Study.

J Frailty Aging 2019 ;8(2):57-61

Professor Dr. Wolfgang Kemmler, Institute of Medical Physics, Friedrich-Alexander University Erlangen-Nürnberg, Henkestrasse 91 91052 Erlangen, Germany, Tel: 0049 9131-8523999, Fax: 0049 9131-8522824, Email:

Background: Declines in muscle mass and function are inevitable developments of the advanced aging process. Corresponding dimensions of longitudinal changes in at-risk populations are still scarce although clinically relevant. The present study monitored changes in morphologic and functional sarcopenia criteria related to sarcopenia in older men with low muscle mass over a period of 24 months. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.14283/jfa.2019.9DOI Listing
January 2019

Smart Microcapsules with Molecular Polarity- and Temperature-Dependent Permeability.

Small 2019 Apr 17:e1900434. Epub 2019 Apr 17.

Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.

Microcapsules with molecule-selective permeation are appealing as microreactors, capsule-type sensors, drug and cell carriers, and artificial cells. To accomplish molecular size- and charge-selective permeation, regular size of pores and surface charges have been formed in the membranes. However, it remains an important challenge to provide advanced regulation of transmembrane transport. Read More

View Article

Download full-text PDF

Source
https://onlinelibrary.wiley.com/doi/abs/10.1002/smll.2019004
Publisher Site
http://dx.doi.org/10.1002/smll.201900434DOI Listing
April 2019
1 Read

A Simple Electrochemical Route to Access Amorphous Co-Ni Hydroxide for Non-enzymatic Glucose Sensing.

Nanoscale Res Lett 2019 Apr 17;14(1):135. Epub 2019 Apr 17.

Institute of Nuclear Physics and Chemistry (INPC), China Academy of Engineering Physics (CAEP), Mianyang, 621999, People's Republic of China.

Among the numerous transition metal hydroxide materials, cobalt- and nickel-based hydroxides have been extensively studied for their excellent electrochemical performances such as non-enzymatic electrochemical sensors. Binary cobalt-nickel hydroxide has received extensive attention for its exceptionally splendid electrochemical behaviors as a promising glucose sensor material. In this work, we report the synthesis of three-dimensional amorphous Co-Ni hydroxide nanostructures with homogeneous distribution of elements via a simple and chemically clean electrochemical deposition method. Read More

View Article

Download full-text PDF

Source
https://nanoscalereslett.springeropen.com/articles/10.1186/s
Publisher Site
http://dx.doi.org/10.1186/s11671-019-2966-2DOI Listing
April 2019
1 Read

[Recognition and classification of posture and gait patterns of rollator users by distance measurements-a comparison between clinical assessment and automatic classification].

Z Gerontol Geriatr 2019 Apr 17. Epub 2019 Apr 17.

Budelmann Elektronik GmbH, Münster, Deutschland.

Background: This article describes the development of an add-on module for wheeled walkers dedicated to sensor-based posture and gait pattern recognition with the goal to develop an everyday aid for fall prevention. The core contribution is a clinical study that compared single gait parameter assessments coming from medical staff to those obtained from an automatic classification algorithm, i. e. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s00391-019-01544-0DOI Listing

Portable biohybrid odorant sensors using cell-laden collagen micropillars.

Lab Chip 2019 Apr 18. Epub 2019 Apr 18.

Center for International Research on Integrative Biomedical Systems (CIBiS), Institute of Industrial Science (IIS), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan. and International Research Center for Neurointelligence, The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Tokyo 153-8505, Japan.

Biohybrid odorant sensors (BOSs) composed of biological materials and artificial detectors have recently attracted much attention due to their high degree of sensitivity and selectivity. Although portability is crucial for the practical use of BOSs on site, the currently used artificial detectors for biological signals are unportable. In this study, we propose a portable cell-based odorant sensor, which uses cell-laden collagen micropillars to compensate the low optical abilities of portable artificial detectors. Read More

View Article

Download full-text PDF

Source
http://xlink.rsc.org/?DOI=C9LC00131J
Publisher Site
http://dx.doi.org/10.1039/c9lc00131jDOI Listing
April 2019
1 Read

: Users motivations for playing Pokémon Go™ and non-users' reasons for not installing.

Health Psychol Res 2019 Mar 11;7(1):7714. Epub 2019 Mar 11.

School of Sport, Leeds Beckett University, Fairfax Hall, Headingley Campus, Leeds, UK.

Urban exergames are played in the real-world environment using built-in mobile phone sensors. The influence of Pokémon Go on physical activity and sitting time has been examined previously, however limited research has explored motivations for using the application. Thus, the aim of this study was to explore Pokémon Go users' motivations for using the application, exusers' reasons for abandoning the game and non-users' reasons for not installing. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.4081/hpr.2019.7714DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6441818PMC

Supramolecular cages as differential sensors for dicarboxylate anions: guest length sensing using principal component analysis of ESI-MS and H-NMR raw data.

Chem Sci 2019 Mar 6;10(12):3523-3528. Epub 2019 Feb 6.

Department of Chemical Sciences , University of Padova , Via Marzolo 1 , 35131 Padova , Italy . Email:

Dynamic covalent libraries (DCLs) have been widely used in the development of differential sensors. Inspired by recent studies which use supramolecular recognition systems for sensing, we report the use of a tris(-pyridylmethyl)amine (TPMA)-based supramolecular cage as a differential sensor for dicarboxylate anions. In particular, a library of molecular cages constituted by linkers differing in size and flexibility was allowed to equilibrate toward a series of guests differing in molecular size. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1039/c8sc05527kDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6432344PMC

A chemical reaction controlled by light-activated molecular switches based on hetero-cyclopentanediyls.

Chem Sci 2019 Mar 18;10(12):3486-3493. Epub 2019 Feb 18.

Institute of Chemistry , University of Rostock , Albert-Einstein-Str. 3a , D-18059 Rostock , Germany . Email: ; Email:

Molecular switches are molecules that can reversibly be shifted between at least two stable states with different physical and chemical properties, making them interesting for application as chemical sensors or molecular machines. We recently discovered that five-membered, cyclic biradicals based on group 15 elements are efficient and robust photochemical switches that can be activated by red light. The quantum yield of the photo-isomerization is as high as 24. Read More

View Article

Download full-text PDF

Source
http://xlink.rsc.org/?DOI=C8SC04893B
Publisher Site
http://dx.doi.org/10.1039/c8sc04893bDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6430090PMC
March 2019
1 Read

Space-confined indicator displacement assay inside a metal-organic framework for fluorescence turn-on sensing.

Chem Sci 2019 Mar 29;10(11):3307-3314. Epub 2019 Jan 29.

Shanghai Key Laboratory of Green Chemistry and Chemical Processes , School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , P. R. China . Email:

The indicator displacement assay (IDA) is for the first time performed within a metal-organic framework (MOF) to achieve ultrasensitive fluorescence turn-on sensing. A Zr(iv) ion MOF (UiO-67-DQ-PsO) furnished with electron-deficient diquat units (DQ, as the receptor) on the wall and electron-rich 1-pyrenesulfonate anions (PsO, as the fluorescent indicator) in the pores was prepared by postsynthetic anion exchange. The MOF is capable of sensing alkylamines owing to the competing PsO-DQ and alkylamine-DQ charge-transfer interactions, the former interaction causing a fluorescence OFF state and the latter displacing PsO to trigger its emission. Read More

View Article

Download full-text PDF

Source
http://xlink.rsc.org/?DOI=C9SC00032A
Publisher Site
http://dx.doi.org/10.1039/c9sc00032aDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6428140PMC
March 2019
1 Read

Trace levels of peptidoglycan in serum underlie the NOD-dependent cytokine response to endoplasmic reticulum stress.

J Biol Chem 2019 Apr 17. Epub 2019 Apr 17.

University of Toronto, Canada.

NOD1 and NOD2 are intracellular sensors of bacterial peptidoglycan that belong to the Nod-like receptor (NLR) family of innate immune proteins. In addition to their role as direct bacterial sensors, it was proposed that NOD proteins could detect endoplasmic reticulum (ER) stress induced by thapsigargin, an inhibitor of the sarcoplasmic or endoplasmic reticulum calcium ATPase family (SERCA) that pumps Ca2+ into the ER, resulting in pro-inflammatory signalling. Here, we confirm that thapsigargin induces NOD-dependent pro-inflammatory signalling in epithelial cells. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1074/jbc.RA119.007997DOI Listing

Optogenetics: Therapeutic spark in neuropathic pain.

Authors:
Long Wang Kang Liu

Bosn J Basic Med Sci 2019 Apr 18. Epub 2019 Apr 18.

Department of Anesthesiology, Renmin Hospital of Wuhan University, 238 # Jie Fang road Wu Chang District, Wuhan, Hubei Province, China.

Optogenetics is an emerging field, which uses light and molecular genetics to manipulate the activity of live cells by expressing light-sensitive proteins. With the discovery of bacteriorhodopsin, a light-sensitive bacterial protein, in 1971 Oesterhelt and Stoeckenius laid the pavement of optogenetics. However, the cross-integration of different disciplines is a little more than a decade old. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.17305/bjbms.2019.4114DOI Listing

Highly Stretchable and Compressible Cellulose Ionic Hydrogels for Flexible Strain Sensors.

Biomacromolecules 2019 Apr 17. Epub 2019 Apr 17.

Stretchable and compressible hydrogels based on natural polymers have received immense considerations for electronics. The feasibility of using pure natural polymer-based hydrogels could be improved, if their mechanical behaviors satisfy the requirements of practical applications. Herein, we report highly stretchable (tensile strain ~126%) and compressible (compression strain ~80%) cellulose ionic hydrogels (CIHs) among pure natural polymer-based hydrogels including cellulose, chitin and chitosan, via chemical crosslinking based on free radical polymerization of allyl cellulose in NaOH/urea aqueous solution. Read More

View Article

Download full-text PDF

Source
http://pubs.acs.org/doi/10.1021/acs.biomac.9b00322
Publisher Site
http://dx.doi.org/10.1021/acs.biomac.9b00322DOI Listing
April 2019
1 Read

Background and Recent Advances in the Locata Terrestrial Positioning and Timing Technology.

Sensors (Basel) 2019 Apr 16;19(8). Epub 2019 Apr 16.

College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China.

Global Navigation Satellite System (GNSS) is the most widely used Positioning, Navigation, and Timing (PNT) technology in the world today, but it suffers some major constraints. Locata is a terrestrial PNT technology that can be considered as a type of localised "constellation", which is able to provide high-accuracy PNT coverage where GNSS cannot be used. This paper presents a comprehensive literature review of the Locata technology and its applications. Read More

View Article

Download full-text PDF

Source
https://www.mdpi.com/1424-8220/19/8/1821
Publisher Site
http://dx.doi.org/10.3390/s19081821DOI Listing
April 2019
1 Read

Effects of Offset Pixel Aperture Width on the Performances of Monochrome CMOS Image Sensors for Depth Extraction.

Sensors (Basel) 2019 Apr 16;19(8). Epub 2019 Apr 16.

School of Electronics Engineering, Kyungpook National University, 80 Deahak-ro, Buk-gu, Daegu 41566, Korea.

This paper presents the effects of offset pixel aperture width on the performance of monochrome (MONO) CMOS image sensors (CISs) for a three-dimensional image sensor. Using a technique to integrate the offset pixel aperture (OPA) inside each pixel, the depth information can be acquired using a disparity from OPA patterns. The OPA is classified into two pattern types: Left-offset pixel aperture (LOPA) and right-offset pixel aperture (ROPA). Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/s19081823DOI Listing

Basic MAC Scheme for RF Energy Harvesting Wireless Sensor Networks: Throughput Analysis and Optimization.

Authors:
Cheon Won Choi

Sensors (Basel) 2019 Apr 16;19(8). Epub 2019 Apr 16.

Department of Applied Computer Engineering, Dankook University, Yongin 31116, Korea.

Traditionally, how to reduce energy consumption has been an issue of utmost importance in wireless sensor networks. Recently, radio frequency (RF) energy harvesting technologies, which scavenge the ambient RF waves, provided us with a new paradigm for such networks. Without replacement or recharge of batteries, an RF energy harvesting wireless sensor network may live an eternal life. Read More

View Article

Download full-text PDF

Source
https://www.mdpi.com/1424-8220/19/8/1822
Publisher Site
http://dx.doi.org/10.3390/s19081822DOI Listing
April 2019
1 Read

Hidden Markov Model-Based Smart Annotation for Benchmark Cyclic Activity Recognition Database Using Wearables.

Sensors (Basel) 2019 Apr 16;19(8). Epub 2019 Apr 16.

Machine Learning and Data Analytics Lab, Computer Science Department, 91052 Erlangen, Germany.

Activity monitoring using wearables is becoming ubiquitous, although accurate cycle level analysis, such as step-counting and gait analysis, are limited by a lack of realistic and labeled datasets. The effort required to obtain and annotate such datasets is massive, therefore we propose a smart annotation pipeline which reduces the number of events needing manual adjustment to 14%. For scenarios dominated by walking, this annotation effort is as low as 8%. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/s19081820DOI Listing

A High Sensitivity Temperature Sensing Probe Based on Microfiber Fabry-Perot Interference.

Sensors (Basel) 2019 Apr 16;19(8). Epub 2019 Apr 16.

College of Information Science and Engineering, Northeastern University, Shenyang 110819, China.

In this paper, a miniature Fabry-Perot temperature probe was designed by using polydimethylsiloxane (PDMS) to encapsulate a microfiber in one cut of hollow core fiber (HCF). The microfiber tip and a common single mode fiber (SMF) end were used as the two reflectors of the Fabry-Perot interferometer. The temperature sensing performance was experimentally demonstrated with a sensitivity of 11. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/s19081819DOI Listing

Object Tracking Based on Vector Convolutional Network and Discriminant Correlation Filters.

Sensors (Basel) 2019 Apr 16;19(8). Epub 2019 Apr 16.

School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

Due to the fast speed and high efficiency, discriminant correlation filter (DCF) has drawn great attention in online object tracking recently. However, with the improvement of performance, the costs are the increase in parameters and the decline of speed. In this paper, we propose a novel visual tracking algorithm, namely VDCFNet, and combine DCF with a vector convolutional network (VCNN). Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/s19081818DOI Listing

An Optimized Node Deployment Solution Based on a Virtual Spring Force Algorithm for Wireless Sensor Network Applications.

Sensors (Basel) 2019 Apr 16;19(8). Epub 2019 Apr 16.

Usun Microelectronics, Nanchang 330072, Jiangxi, China.

How to effectively deploy all wireless sensors and save a system's energy consumption is a key issue in current wireless sensor network (WSN) applications. Theoretical analysis has proven that a hexagonal structure is the best topology in the two-dimensional network, which can provide the maximum coverage area with the minimum number of sensor nodes and minimum energy consumption. Recently, many scientists presented their self-deployment strategies based on different virtual forces and discussed the corresponding efficiency via several case studies. Read More

View Article

Download full-text PDF

Source
https://www.mdpi.com/1424-8220/19/8/1817
Publisher Site
http://dx.doi.org/10.3390/s19081817DOI Listing
April 2019
1 Read

Sensitivity of Safe Trajectory in a Game Environment to Determine Inaccuracy of Radar Data in Autonomous Navigation.

Authors:
Józef Lisowski

Sensors (Basel) 2019 Apr 16;19(8). Epub 2019 Apr 16.

Faculty of Marine Electrical Engineering, Gdynia Maritime University, 81-225 Gdynia, Poland.

This article provides an analysis of the autonomous navigation of marine objects, such as ships, offshore vessels and unmanned vehicles, and an analysis of the accuracy of safe control in game conditions for the cooperation of objects during maneuvering decisions. A method for determining safe object strategies based on a cooperative multi-person positional modeling game is presented. The method was used to formulate a measure of the sensitivity of safe control in the form of a relative change in the payment of the final game; to determine the final deviation of the safe trajectory from the set trajectory of the autonomous vehicle movement; and to calculate the accuracy of information in terms of evaluating the state of the control process. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/s19081816DOI Listing

Highly Sensitive and Selective Nanogap-Enhanced SERS Sensing Platform.

Nanomaterials (Basel) 2019 Apr 16;9(4). Epub 2019 Apr 16.

Advanced Nano-Surface Department (ANSD), Korea Institute of Materials Science (KIMS), Changwon 51508, Korea.

This paper reports a highly sensitive and selective surface-enhanced Raman spectroscopy (SERS) sensing platform. We used a simple fabrication method to generate plasmonic hotspots through a direct maskless plasma etching of a polymer surface and the surface tension-driven assembly of high aspect ratio Ag/polymer nanopillars. These collapsed plasmonic nanopillars produced an enhanced near-field interaction via coupled localized surface plasmon resonance. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/nano9040619DOI Listing

Evaluating Maize Genotype Performance under Low Nitrogen Conditions Using RGB UAV Phenotyping Techniques.

Sensors (Basel) 2019 Apr 16;19(8). Epub 2019 Apr 16.

Integrative Crop Ecophysiology Group, Plant Physiology Section, Faculty of Biology, University of Barcelona, 08028 Barcelona, Spain.

Maize is the most cultivated cereal in Africa in terms of land area and production, but low soil nitrogen availability often constrains yields. Developing new maize varieties with high and reliable yields using traditional crop breeding techniques in field conditions can be slow and costly. Remote sensing has become an important tool in the modernization of field-based high-throughput plant phenotyping (HTPP), providing faster gains towards the improvement of yield potential and adaptation to abiotic and biotic limiting conditions. Read More

View Article

Download full-text PDF

Source
https://www.mdpi.com/1424-8220/19/8/1815
Publisher Site
http://dx.doi.org/10.3390/s19081815DOI Listing
April 2019
1 Read

High-Level Modeling and Simulation Tool for Sensor Conditioning Circuit Based on Artificial Neural Networks.

Sensors (Basel) 2019 Apr 16;19(8). Epub 2019 Apr 16.

Group of Electronic Design (GDE), University of Zaragoza, 50009 Zaragoza, Spain.

For current microelectronic integrated systems, the design methodology involves different steps that end up in the full system simulation by means of electrical and physical models prior to its manufacture. However, the higher the circuit complexity, the more time is required to complete these simulations, jeopardizing the convergence of the numerical methods and, hence, meaning that the reliability of the results are not guaranteed. This paper shows the use of a high-level tool based on Matlab to simulate the operation of an artificial neural network implemented in a mixed analog-digital CMOS process, intended for sensor calibration purposes. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/s19081814DOI Listing

A First Implementation of Underwater Communications in Raw Water Using the 433 MHz Frequency Combined with a Bowtie Antenna.

Sensors (Basel) 2019 Apr 16;19(8). Epub 2019 Apr 16.

United Utilities, Warrington WA5 3LP, UK.

In 2016, there were 317 serious water pollution incidents in the UK, with 78,000 locations where businesses discharge controlled quantities of pollutants into rivers; therefore, continuous monitoring is vital. Since 1998, the environment agency has taken over 50 million water samples for water quality monitoring. The Internet of Things has grown phenomenally in recent years, reaching all aspects of our lives, many of these connected devices use wireless sensor networks to relay data to internet-connected nodes, where data can be processed, analyzed and consumed. Read More

View Article

Download full-text PDF

Source
https://www.mdpi.com/1424-8220/19/8/1813
Publisher Site
http://dx.doi.org/10.3390/s19081813DOI Listing
April 2019
1 Read

Sensors that Learn: The Evolution from Taste Fingerprints to Patterns of Early Disease Detection.

Micromachines (Basel) 2019 Apr 16;10(4). Epub 2019 Apr 16.

Department of Biomaterials, College of Dentistry, Bioengineering Institute, New York University, New York, NY 10010, USA.

The McDevitt group has sustained efforts to develop a programmable sensing platform that offers advanced, multiplexed/multiclass chem-/bio-detection capabilities. This scalable chip-based platform has been optimized to service real-world biological specimens and validated for analytical performance. Fashioned as a sensor that learns, the platform can host new content for the application at hand. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/mi10040251DOI Listing

LiDAR-Based Real-Time Detection and Modeling of Power Lines for Unmanned Aerial Vehicles.

Sensors (Basel) 2019 Apr 16;19(8). Epub 2019 Apr 16.

INESC Technology and Science, Centre for Robotics and Autonomous Systems, 4200-465 Porto, Portugal.

The effective monitoring and maintenance of power lines are becoming increasingly important due to a global growing dependence on electricity. The costs and risks associated with the traditional foot patrol and helicopter-based inspections can be reduced by using UAVs with the appropriate sensors. However, this implies developing algorithms to make the power line inspection process reliable and autonomous. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/s19081812DOI Listing

Flow field perception based on the fish lateral line system.

Bioinspir Biomim 2019 Apr 17. Epub 2019 Apr 17.

Beihang University, Beijing, CHINA.

Fish are able to perceive the surrounding weak flow and pressure variations with their mechanosensory lateral line system, which consists of a superficial lateral line for flow velocity detection and a canal lateral line for flow pressure gradient perception. Achieving a better understanding of the flow field perception algorithms of the lateral line can contribute not only to the design of highly sensitive flow sensors, but also to the development of underwater smart skin with good hydrodynamic imaging properties. In this review, we discuss highly sensitive flow-sensing mechanisms for superficial and canal neuromasts and flow field perception algorithms. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1088/1748-3190/ab1a8dDOI Listing

Laser micro-structured pressure sensor with modulated sensitivity for electronic skins.

Nanotechnology 2019 Apr 17. Epub 2019 Apr 17.

Key Laboratory of Safety Science of Pressurized System MOE School of Mechanical Engineering, East China University of Science and Technology, shanghai, CHINA.

Micro-structured pressure sensors with broad pressure sensing range, high sensitivity, rapid response speeds are highly desired for epidermal electronic skins. The widely used methods to fabricate micro-structured pressure sensors are lithography and biomaterial-templating, which is either complex in preparation procedure or uncontrollable in micro-structure morphology. In this work, laser micro-structured wearable pressure sensors with high-performance is developed for epidermal electronic skin. Read More

View Article

Download full-text PDF

Source
http://iopscience.iop.org/article/10.1088/1361-6528/ab1a86
Publisher Site
http://dx.doi.org/10.1088/1361-6528/ab1a86DOI Listing
April 2019
1 Read

Recognition of silver cations by multifarene[2,2] chemosensors with unexpected fluorescence response.

Spectrochim Acta A Mol Biomol Spectrosc 2019 Apr 9;218:213-220. Epub 2019 Apr 9.

Institute of Biomedical & Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen 518055, China. Electronic address:

Fluorescent chemosensors based on a new macrocyclic compound, multifarene[2,2], with modification by triazole-linked pyrene or anthracene were synthesized. These macrocyclic sensors exhibited high affinity and selectivity toward Ag over other metal ions, with ratiometric or enhanced response of their fluorescence emissions depending upon the substituent species for coordination to Ag, and an unexpected response to a concentration threshold of the metal cations was discovered. The experimental evidences of fluorescence spectra, H NMR titration, IR spectra, and high-resolution mass spectra suggested the coordination behaviors of the sensors with Ag, that is, the 1:1 complexes were formed with moderate association constants of about 10 L·mol, and the sulfur atoms on macrocyclic ligand should affinite to the metal cations. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.saa.2019.04.011DOI Listing

Recyclable fluorescent chemodosimeters based on 8-hydroxyquinoline derivatives for highly sensitive and selective detection of mercury(II) in aqueous media and test strips.

Spectrochim Acta A Mol Biomol Spectrosc 2019 Apr 4;218:196-205. Epub 2019 Apr 4.

School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China. Electronic address:

Four novel highly selective 8-hydroxyquinoline-based fluorescent chemodosimeters (1-4) were synthesized for the rapid analysis of Hg in aqueous solution and on paper strips, which probably attributed to the excited state intramolecular proton transfer (ESIPT) process. Chemodosimeter 1 was evaluated as a Hg-ratiometric fluorescent sensor while others (2, 3 and 4) displayed fluorescence turn-on response for Hg among the various survey metal ions. We demonstrated that chemodosimeters (1-4) could recognized Hg ions based on a 1:1 stoichiometric binding event with fast detection time. Read More

View Article

Download full-text PDF

Source
https://linkinghub.elsevier.com/retrieve/pii/S13861425193037
Publisher Site
http://dx.doi.org/10.1016/j.saa.2019.04.004DOI Listing
April 2019
1 Read

A one-commodity pickup-and-delivery traveling salesman problem solved by a two-stage method: A sensor relocation application.

PLoS One 2019 17;14(4):e0215107. Epub 2019 Apr 17.

School of Civil Engineering, Central South University, Changsha, Hunan, China.

In the carrier-based coverage repair problem, a single mobile robot replaces damaged sensors by picking up spare ones in the region of interest or carrying them from a base station in wireless sensor and robot networks. The objective is to find the shortest path of the robot. The problem is an extension of the traveling salesman problem (TSP). Read More

View Article

Download full-text PDF

Source
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0215107PLOS
April 2019
1 Read

On-Board Sensor-Based NO Emissions from Heavy-Duty Diesel Vehicles.

Environ Sci Technol 2019 Apr 17. Epub 2019 Apr 17.

Real-world nitrogen oxides (NO) emissions were estimated using on-board sensor readings from 72 heavy-duty diesel vehicles (HDDVs) equipped with Selective Catalytic Reduction (SCR) system in California. The results showed that there were large differences between in-use and certification NO emissions, with 12 HDDVs emitted more than three times the standard during hot-running and idling operations in the real world. The overall NO conversion efficiencies of the SCR system on many vehicles were well below the 90% threshold that is expected for an efficient SCR system, even when the SCR system was above the optimum operating temperature threshold of 250°C. Read More

View Article

Download full-text PDF

Source
http://pubs.acs.org/doi/10.1021/acs.est.8b07048
Publisher Site
http://dx.doi.org/10.1021/acs.est.8b07048DOI Listing
April 2019
1 Read

Chemistry of Layered Pnictogens: Phosphorus, Arsenic, Antimony, and Bismuth.

Angew Chem Int Ed Engl 2019 Apr 17. Epub 2019 Apr 17.

Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technicka 5, 166 28, Prague 6, Czech Republic.

Materials with few layers have been subjected to extensive research for the last few decades owing to their remarkable properties as for example catalysts, optical and electrical devices, or sensors. The properties and electronic structure of these materials can be tailored by the introduction of substituents. In the case of more reactive species, the modification also can improve stability, which is also an important factor with respect to device fabrication. Read More

View Article

Download full-text PDF

Source
http://doi.wiley.com/10.1002/anie.201900811
Publisher Site
http://dx.doi.org/10.1002/anie.201900811DOI Listing
April 2019
1 Read

Artificial muscle with reversible and controllable deformation based on stiffness-variable carbon nanotube spring-like nanocomposite yarn.

Nanoscale 2019 Apr 17. Epub 2019 Apr 17.

National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, P. R. China. and Shenzhen STRONG Advanced Materials Research Institute Co., Ltd., Shenzhen 518000, P. R. China.

Carbon nanotube yarn actuators are in great demand for flexible devices or intelligent applications. Artificial muscles based on carbon nanotube yarn have achieved great progress over past decades. However, uncontrollable, small deformations and relatively slow deformation recovery are still great challenges for carbon nanotube yarn artificial muscles. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1039/c9nr00611gDOI Listing

Comparison of Continuous Glucose Monitoring Accuracy Between Abdominal and Upper Arm Insertion Sites.

Diabetes Technol Ther 2019 Apr 17. Epub 2019 Apr 17.

1 Department of Endocrinology, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark.

The aim was to compare the accuracy of the Dexcom G4 Platinum continuous glucose monitor (CGM) sensor inserted on the upper arm and the abdomen in adults. Fourteen adults with type 1 diabetes wore two CGMs, one placed on the upper arm and one placed on the abdomen. Three in-clinic visits of 5 h with YSI (2300 STAT, Yellow Springs Instrument) measurements as comparator were performed. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1089/dia.2019.0014DOI Listing

Design and demonstration of tunable amplified sensitivity of AlGaN/GaN high electron mobility transistor (HEMT)-based biosensors in human serum.

Anal Chem 2019 Apr 17. Epub 2019 Apr 17.

We have developed a swift and simplistic protein immunoassay using aptamer functionalized AlGaN/GaN high electron mobility transistors (HEMTs). The unique design of the sensor facilitates protein detection in physiological salt environment overcoming charge screening effects, without requiring sample pre-processing. This study reports a tunable and amplified sensitivity of solution-gated electric double layer (EDL) HEMT-based biosensors, which demonstrates significantly enhanced sensitivity by designing a smaller gap between the gate electrode and the detection, and by operating at higher gate voltage. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1021/acs.analchem.9b00353DOI Listing

Measurement of physical activity in clinical practice using accelerometers.

J Intern Med 2019 Apr 16. Epub 2019 Apr 16.

Center for Health and Performance, Department of Food and Nutrition, and Sport Science, University of Gothenburg, Gothenburg, Sweden.

Accelerometers are commonly used in clinical and epidemiological research for more detailed measures of physical activity and to target the limitations of self-report methods. Sensors are attached at the hip, wrist and thigh, and the acceleration data are processed and calibrated in different ways to determine activity intensity, body position and/or activity type. Simple linear modelling can be used to assess activity intensity from hip and thigh data, whilst more advanced machine-learning modelling is to prefer for the wrist. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1111/joim.12908DOI Listing

Correction: Iridium(iii) polypyridine complexes with a disulfide linker as biological sensors and cytotoxic agents.

Dalton Trans 2019 Apr 17. Epub 2019 Apr 17.

Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, P. R. China. and State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, P. R. China and Center of Functional Photonics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, P. R. China.

Correction for 'Iridium(iii) polypyridine complexes with a disulfide linker as biological sensors and cytotoxic agents' by Steve Po-Yam Li et al., Dalton Trans., 2019, DOI: 10. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1039/c9dt90095kDOI Listing

Hand-Fabricated CNT/AgNPs Electrodes using Wax-on-Plastic Platforms for Electro-Immunosensing Application.

Sci Rep 2019 Apr 16;9(1):6131. Epub 2019 Apr 16.

Department of Chemistry & Biochemistry, 1245 Lincoln Dr, Southern Illinois University at Carbondale, Carbondale, IL, 62901, USA.

Fabrication of inexpensive and flexible electronic and electrochemical sensors is in high demand for a wide range of biochemical and biomedical applications. We explore hand fabrication of CNT modified AgNPs electrodes using wax-on-plastic platforms and their application in electrochemical immunosensing. Wax patterns were printed on polyethylene terephthalate-based substrates to laydown templates for the electrodes. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1038/s41598-019-42644-6DOI Listing

Tau repeat regions contain conserved histidine residues that modulate microtubule-binding in response to changes in pH.

J Biol Chem 2019 Apr 16. Epub 2019 Apr 16.

Cell & Tissue Biology, University of California, San Francisco, United States.

Tau, a member of the MAP2/tau family of microtubule-associated proteins, stabilizes and organizes axonal microtubules in healthy neurons. In neurodegenerative tauopathies, tau dissociates from microtubules and forms neurotoxic extracellular aggregates. MAP2/tau family proteins are characterized by three to five conserved, intrinsically disordered repeat regions that mediate electrostatic interactions with the microtubule surface. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1074/jbc.RA118.007004DOI Listing

Variable-Fidelity Simulation Models and Sparse Gradient Updates for Cost-Efficient Optimization of Compact Antenna Input Characteristics.

Sensors (Basel) 2019 Apr 15;19(8). Epub 2019 Apr 15.

Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology, 80-233 Gdansk, Poland.

Design of antennas for the Internet of Things (IoT) applications requires taking into account several performance figures, both electrical (e.g., impedance matching) and field (gain, radiation pattern), but also physical constraints, primarily concerning size limitation. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/s19081806DOI Listing

Combining Segmentation and Edge Detection for Efficient Ore Grain Detection in an Electromagnetic Mill Classification System.

Sensors (Basel) 2019 Apr 15;19(8). Epub 2019 Apr 15.

Department of Control Systems and Instrumentation, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava-Poruba, Czech Republic.

This paper presents a machine vision method for detection and classification of copper ore grains. We proposed a new method that combines both seeded regions growing segmentation and edge detection, where region growing is limited only to grain boundaries. First, a 2D Fast Fourier Transform (2DFFT) and Gray-Level Co-occurrence Matrix (GLCM) are calculated to improve the detection results and processing time by eliminating poor quality samples. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/s19081805DOI Listing

Bend and Moisture Effects on the Performance of a U-Shaped Slotted Wearable Antenna for Off-Body Communications in an Industrial Scientific Medical (ISM) 2.4 GHz Band.

Sensors (Basel) 2019 Apr 15;19(8). Epub 2019 Apr 15.

Department of Signal Theory and Communications, Escuela Politécnica Superior, Universidad de Alcalá, Campus Universitario, Ctra. de Madrid a Barcelona km 33.600, 28805 Alcalá de Henares, Spain.

In recent years, the study and design of wearable antennas have been empowered given the success of Wireless Body Area Networks (WBAN) for healthcare and medical purposes. This work analyses a flexible textile antenna whose performance can be optimised by the careful selection of the substrate thickness of the textile material, and by varying the antenna's geometrical shape. After considering these parameters, several arrangements of antennas were simulated using the Computer Simulation Technology software (CST). Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/s19081804DOI Listing