66,413 results match your criteria Sensors Basel Switzerland[Journal]


Computer vision-based phenotyping for improvement of plant productivity: A machine learning perspective.

Gigascience 2018 Dec 6. Epub 2018 Dec 6.

Department of Information Engineering and Computer Science, University of Trento, Via Sommarive 9, 38123 Trento, Italy.

Employing computer vision to extract useful information from images and videos is becoming a key technique for identifying phenotypic changes in plants. In this report, we review the emerging aspects of computer vision for automated plant phenotyping. Recent advances in image analysis empowered by machine learning-based techniques, including convolutional neural network-based modeling, have expanded their application to assist high-throughput plant phenotyping. Read More

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December 2018

Digital versatile discs as platforms for multiplexed genotyping based on selective ligation and universal microarray detection.

Analyst 2018 Dec 6. Epub 2018 Dec 6.

Departamento de Química, Universitat Politècnica de València, Camino de Vera s/n, E46022, Valencia, Spain. and Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Universitat Politècnica de València-Universitat de València, Valencia, Spain and Unidad Mixta UPV-La Fe, Nanomedicine and Sensors, IIS La Fe, Valencia, Spain.

The development of a high-performance assay readout using integrated detectors is a current challenge in the implementation of DNA tests in diagnostic laboratories, particularly for supporting pharmacogenetic tests. A method for allelic discrimination, associated with single nucleotide polymorphisms (SNPs), is presented. Genomic DNA is extracted from blood and buccal swab samples. Read More

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December 2018
1 Read

Printable Fabrication of a Fully Integrated and Self-Powered Sensor System on Plastic Substrates.

Adv Mater 2018 Dec 6:e1804285. Epub 2018 Dec 6.

Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, SAR, China.

Wearable and portable devices with desirable flexibility, operational safety, and long cruising time, are in urgent demand for applications in wireless communications, multifunctional entertainments, personal healthcare monitoring, etc. Herein, a monolithically integrated self-powered smart sensor system with printed interconnects, printed gas sensor for ethanol and acetone detection, and printable supercapacitors and embedded solar cells as energy sources, is successfully demonstrated in a wearable wristband fashion by utilizing inkjet printing as a proof-of-concept. In such a "wearable wristband", the harvested solar energy can either directly drive the sensor and power up a light-emitting diode as a warning signal, or can be stored in the supercapacitors in a standby mode, and the energy released from supercapacitors can compensate the intermittency of light illumination. Read More

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December 2018
1 Read

IoT-Based Services and Applications for Mental Health in the Literature.

J Med Syst 2018 Dec 6;43(1):11. Epub 2018 Dec 6.

Psiquiatry Service, Hospital Zamora, Hernán Cortés, Zamora, Spain.

Internet of Things (IoT) has emerged as a new paradigm today, connecting a variety of physical and virtual elements integrated with electronic components, sensors, actuators and software to collect and exchange data. IoT is gaining increasing attention as a priority research topic in the Health sector in general and in specific areas such as Mental Health. The main objective of this paper is to show a review of the existing research works in the literature, referring to the main IoT services and applications in Mental Health diseases. Read More

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December 2018
2 Reads

Metal Substrate-Induced Line Width Compression in the Magnetic Dipole Resonance of a Silicon Nanosphere Illuminated by a Focused Azimuthally Polarized Beam.

Nanoscale Res Lett 2018 Dec 5;13(1):395. Epub 2018 Dec 5.

Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou, 510006, China.

We investigate the modification of the magnetic dipole resonance of a silicon nanosphere, which is illuminated by a focused azimuthally polarized beam, induced by a metal substrate. It is found that the magnetic dipole of the silicon nanosphere excited by the focused azimuthally polarized beam and its image dipole induced by the metal substrate are out of phase. The interference of these two anti-parallel dipoles leads to a dramatic line width compression in the magnetic dipole resonance, manifested directly in the scattering spectrum of the silicon nanosphere. Read More

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December 2018
2 Reads

High-performance stretchable conductive nanocomposites: materials, processes, and device applications.

Chem Soc Rev 2018 Dec 6. Epub 2018 Dec 6.

Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea and Institute of Chemical Processing (ICP), Seoul National University, Seoul 08826, Republic of Korea.

Highly conductive and intrinsically stretchable electrodes are vital components of soft electronics such as stretchable transistors and circuits, sensors and actuators, light-emitting diode arrays, and energy harvesting devices. Many kinds of conducting nanomaterials with outstanding electrical and mechanical properties have been integrated with elastomers to produce stretchable conductive nanocomposites. Understanding the characteristics of these nanocomposites and assessing the feasibility of their fabrication are therefore critical for the development of high-performance stretchable conductors and electronic devices. Read More

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December 2018
1 Read

A spin crossover porous hybrid architecture for potential sensing applications.

Chem Commun (Camb) 2018 Dec 6. Epub 2018 Dec 6.

Institut des Matériaux Poreux de Paris, FRE 2000, CNRS - ENS - ESPCI, PSL Research University, F-75005 Paris, France. and Institut Lavoisier de Versailles, UMR 8180, Université de Versailles - Saint-Quentin en Yvelines, F-75005 Paris, France.

Spin crossover cations have been successfully synthesized in the pores of a mesoporous robust Metal-Organic Framework (MOF) MIL-100(Al) through sequential introduction of Fe(iii) cations and a sal2trien ligand. The MIL-100(Al)@Fe(sal2trien) hybrid material retains its crystallinity and partial porosity compared to the parent MOF. The spin state of the Fe(sal2trien)+ cations can be modulated at room temperature through sorption of guest molecules, paving the way to the design of a new generation of sensors based on MOF@spin crossover complex solids. Read More

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December 2018

How Bispectral Index Compares to Spectral Entropy of the EEG and A-line ARX Index in the Same Patient.

Open Med (Wars) 2018 24;13:583-596. Epub 2018 Nov 24.

Department of Anaesthesia and Intensive Care Medicine, Innsbruck Medical University, A-6020 Innsbruck, Anichstrasse 35, Innsbruck Austria.

Background: Bispectral index (BIS) monitoring of depth of anesthesia has pioneered the field for more recent monitoring devices like the A-line ARX Index (AAI) or the state (SE) and response entropy (RE) monitoring devices. Following an observational design the present study aimed to simultaneously compare in the same patient recorded BIS, AAI and entropy values.

Methods: Data from patients (n = 32) undergoing minor gynecological operations were analyzed. Read More

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November 2018

Born to sense: biophysical analyses of the oxygen sensing prolyl hydroxylase from the simplest animal .

Hypoxia (Auckl) 2018 9;6:57-71. Epub 2018 Nov 9.

Chemistry Research Laboratory, University of Oxford, Oxford, UK,

Background: In humans and other animals, the chronic hypoxic response is mediated by hypoxia inducible transcription factors (HIFs) which regulate the expression of genes that counteract the effects of limiting oxygen. Prolyl hydroxylases (PHDs) act as hypoxia sensors for the HIF system in organisms ranging from humans to the simplest animal .

Methods: We report structural and biochemical studies on the HIF prolyl hydroxylase (PHD) that inform about the evolution of hypoxia sensing in animals. Read More

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November 2018

Novel Method of Non-contact Remote Measurement of Neuronal Electrical Activity.

Cureus 2018 Sep 28;10(9):e3384. Epub 2018 Sep 28.

Neurosurgery, Riverside University Health System, Moreno Valley, USA.

Measuring the electrical potential of a neuron cell currently requires direct contact with the cell surface. This method requires invasive probing and is limited by the deflection of electricity from baseline. From a clinical perspective, the electrical potential of the brain's surface can only be measured to a depth of one centimeter using an electroencephalogram (EEG), however, it cannot measure much deeper structures. Read More

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September 2018
1 Read

Stroke Patients' Acceptance of a Smart Garment for Supporting Upper Extremity Rehabilitation.

IEEE J Transl Eng Health Med 2018 18;6:2101009. Epub 2018 Oct 18.

Industrial Design DepartmentEindhoven University of Technology5612AZEindhovenThe Netherlands.

The objective is to evaluate to which extent that a garment equipped with sensors that can support posture monitoring can be used in upper extremity rehabilitation training of stroke patients. Seventeen stroke survivors (mean age: 55 years old, SD =13.5) were recruited in three hospitals in Shanghai. Read More

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October 2018

Mapping the pH sensors critical for host cell entry by a complex non-enveloped virus.

J Virol 2018 Dec 5. Epub 2018 Dec 5.

Department of Pathogen Molecular Biology, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, United Kingdom

Bluetongue virus (BTV), family , is an insect-borne, double-capsid virus causing haemorrhagic disease in livestock around the world. Here we elucidate how outer capsid proteins VP2 and VP5 coordinate cell entry of BTV. To identify key functional residues, we used atomic-level structural data to guide mutagenesis of VP2 and VP5, and a series of biological and biochemical approaches, including site-directed mutagenesis, reverse genetics-based virus recovery, expression and characterization of individual recombinant mutant proteins and various and assays. Read More

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December 2018
3 Reads

Background-free fluorescence decay time sensing and imaging of pH with highly photostable diazaoxotriangulenium dyes.

Anal Chem 2018 Dec 6. Epub 2018 Dec 6.

Novel fluorescent diazaoxatriangulenium (DAOTA) pH indicators for lifetime-based self-referenced pH sensing are reported. The DAOTA dyes were decorated with phenolic receptor groups inducing fluorescence quenching via photoinduced electron transfer mechanism. Electron-withdrawing chlorine substituents ensure response in the most relevant pH range (apparent pK'a values ~5 and 7. Read More

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December 2018

Robust Lane-Detection Method for Low-Speed Environments.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

School of Electronic Information, Wuhan University, Wuhan 430072, China.

Vision-based lane-detection methods provide low-cost density information about roads for autonomous vehicles. In this paper, we propose a robust and efficient method to expand the application of these methods to cover low-speed environments. First, the reliable region near the vehicle is initialized and a series of rectangular detection regions are dynamically constructed along the road. Read More

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December 2018
2 Reads

Data Compression Based on Stacked RBM-AE Model for Wireless Sensor Networks.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

School of Mechanical Engineering and Electronic Information, China University of Geosciences, Wuhan 430074, China.

Data compression is very important in wireless sensor networks (WSNs) with the limited energy of sensor nodes. Data communication results in energy consumption most of the time; the lifetime of sensor nodes is usually prolonged by reducing data transmission and reception. In this paper, we propose a new Stacked RBM Auto-Encoder (Stacked RBM-AE) model to compress sensing data, which is composed of a encode layer and a decode layer. Read More

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December 2018

An Improved YOLOv2 for Vehicle Detection.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

Key Laboratory of Dependable Service Computing in Cyber Physical Society of Ministry of Education, Chongqing University, Chongqing 40004, China.

Vehicle detection is one of the important applications of object detection in intelligent transportation systems. It aims to extract specific vehicle-type information from pictures or videos containing vehicles. To solve the problems of existing vehicle detection, such as the lack of vehicle-type recognition, low detection accuracy, and slow speed, a new vehicle detection model YOLOv2_Vehicle based on YOLOv2 is proposed in this paper. Read More

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December 2018
1 Read

A Review of Wearable Solutions for Physiological and Emotional Monitoring for Use by People with Autism Spectrum Disorder and Their Caregivers.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

Tyndall National Institute, University College Cork, T12 R5CP Cork, Ireland.

The goal of real-time feedback on physiological changes, stress monitoring and even emotion detection is becoming a technological reality. People in their daily life experience varying emotional states, some of which are negative and which can lead to decreased attention, decreased productivity and ultimately, reduced quality of life. Therefore, having a solution that continuously monitors the physiological signals of the person and assesses his or her emotional well-being could be a very valuable tool. Read More

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December 2018

Driver's Facial Expression Recognition in Real-Time for Safe Driving.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

Department of Computer Engineering, Keimyung University, Daegu 42601, Korea.

In recent years, researchers of deep neural networks (DNNs)-based facial expression recognition (FER) have reported results showing that these approaches overcome the limitations of conventional machine learning-based FER approaches. However, as DNN-based FER approaches require an excessive amount of memory and incur high processing costs, their application in various fields is very limited and depends on the hardware specifications. In this paper, we propose a fast FER algorithm for monitoring a driver's emotions that is capable of operating in low specification devices installed in vehicles. Read More

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December 2018

Foreground Detection with Deeply Learned Multi-Scale Spatial-Temporal Features.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China.

Foreground detection, which extracts moving objects from videos, is an important and fundamental problem of video analysis. Classic methods often build background models based on some hand-craft features. Recent deep neural network (DNN) based methods can learn more effective image features by training, but most of them do not use temporal feature or use simple hand-craft temporal features. Read More

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December 2018
2 Reads

Hybrid Blockchain and Internet-of-Things Network for Underground Structure Health Monitoring.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea.

The Internet-of-things (IoT) and blockchain are growing realities of modern society, and both are rapidly transforming civilization, either separately or in combination. However, the leverage of both technologies for structural health monitoring (SHM) to enable transparent information sharing among involved parties and autonomous decision making has not yet been achieved. Therefore, this study combines IoT with blockchain-based smart contracts for SHM of underground structures to define a novel, efficient, scalable, and secure distributed network for enhancing operational safety. Read More

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December 2018

Lightweight Workload Fingerprinting Localization Using Affinity Propagation Clustering and Gaussian Process Regression.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

Department of Information and Communication Engineering, Chosun University, Kwangju 501-759, Korea.

Fingerprinting localization approach is widely used in indoor positioning applications owing to its high reliability. However, the learning procedure of radio signals in fingerprinting is time-consuming and labor-intensive. In this paper, an affinity propagation clustering (APC)-based fingerprinting localization system with Gaussian process regression (GPR) is presented for a practical positioning system with the reduced offline workload and low online computation cost. Read More

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December 2018

Context/Resource-Aware Mission Planning Based on BNs and Concurrent MDPs for Autonomous UAVs.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

Lab-STICC, CNRS, Université de Bretagne Sud, 56100 Lorient, France.

This paper presents a scalable approach to model uncertainties within a UAV (Unmanned Aerial Vehicle) embedded mission manager. It proposes a concurrent version of BFM models, which are Bayesian Networks built from FMEA (Failure Mode and Effects Analysis) and used by MDPs (Markov Decision Processes). The models can separately handle different applications during the mission; they consider the context of the mission including external constraints (luminosity, climate, etc. Read More

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December 2018

Evaluation of Continuous Lactate Monitoring Systems within a Heparinized In Vivo Porcine Model Intravenously and Subcutaneously.

Biosensors (Basel) 2018 Dec 4;8(4). Epub 2018 Dec 4.

Biocrede Inc., Plymouth, MI 48170, USA.

We present an animal model used to evaluate the in vivo performance of electrochemical amperometric continuous lactate sensors compared to blood gas instruments. Electrochemical lactate sensors were fabricated, placed into 5 Fr central venous catheters (CVCs), and paired with wireless potentiostat devices. Following in vivo evaluation and calibration, sensors were placed within the jugular and femoral veins of a porcine subject as a preliminary assessment of in vivo measurement accuracy. Read More

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December 2018

MAPLE Assembled Acetylcholinesterase⁻Polyethylenimine Hybrid and Multilayered Interfaces for Toxic Gases Detection.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

National Institute for Lasers, Plasma and Radiation Physics, Magurele RO, Bucharest 077125, Romania.

Developing a controlled method for obtaining hybrid enzymatic-based interfaces for sensing application require the use of a multiuse, reusable sensor. By controlling the interface characteristics in terms of the surface chemistry, thickness, and roughness, a tailored response toward various toxic compounds can be obtained, regarding both materials used as active surfaces and fabrication methods. Herein, we report a preliminary study on using a laser-based method (i. Read More

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December 2018

Sensor Distribution Optimization for Structural Impact Monitoring Based on NSGA-II and Wavelet Decomposition.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

School of Mechatronics & Vehicle Engineering, East China Jiaotong University, Nanchang 330013, China.

Optimal sensor placement is a significant task for structural health monitoring (SHM). In this paper, an SHM system is designed which can recognize the different impact location and impact degree in the composite plate. Firstly, the finite element method is used to simulate the impact, extracting numerical signals of the structure, and the wavelet decomposition is used to extract the band energy. Read More

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December 2018
4 Reads

Infiltrated Photonic Crystal Fibers for Sensing Applications.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

GDAF-UC3M, Displays and Photonics Applications Group, Electronic Technology Department, Carlos III University of Madrid, Leganés, 28911 Madrid, Spain.

Photonic crystal fibers (PCFs) are a special class of optical fibers with a periodic arrangement of microstructured holes located in the fiber's cladding. Light confinement is achieved by means of either index-guiding, or the photonic bandgap effect in a low-index core. Ever since PCFs were first demonstrated in 1995, their special characteristics, such as potentially high birefringence, very small or high nonlinearity, low propagation losses, and controllable dispersion parameters, have rendered them unique for many applications, such as sensors, high-power pulse transmission, and biomedical studies. Read More

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December 2018

Circularly Polarized Broadband Printed Antenna for Wireless Applications.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

Centre of Advanced Electronic and Communication Engineering, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.

A simple, compact sickle-shaped printed antenna with a slotted ground plane is designed and developed for broadband circularly polarized (CP) radiation. The sickle-shaped radiator with a tapered feed line and circular slotted square ground plane are utilized to realize the wideband CP radiation feature. With optimized dimensions of 0. Read More

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December 2018

Characterization of Recombinant His-Tag Protein Immobilized onto Functionalized Gold Nanoparticles.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

Department of Chemistry, University of Puerto Rico-Mayagüez Campus, Mayagüez 00680, Puerto Rico.

The recombinant polyhistidine-tagged hemoglobin I ((His)₆-rHbI) from the bivalve is an ideal biocomponent for a hydrogen sulfide (H₂S) biosensor due to its high affinity for H₂S. In this work, we immobilized (His)₆-rHbI over a surface modified with gold nanoparticles functionalized with 3-mercaptopropionic acid complexed with nickel ion. The attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) analysis of the modified-gold electrode displays amide I and amide II bands characteristic of a primarily α-helix structure verifying the presence of (His)₆-rHbI on the electrode surface. Read More

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December 2018

A Stellar Imaging Error Correction Method Based on an Ellipsoid Model: Taking Ziyuan 3-02 Satellite Data Analysis as an Example.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

Stellar point image coordinates are one of the important observations needed for high-precision space attitude measurement with a star sensor. High-coupling imaging errors occur under dynamic imaging conditions. Using the results of preliminary star point extraction from star sensor imaging data combined with a superimposed time series, we analyze the relative motion and trajectory based on the star point image, establish an image error ellipsoid fitting model based on the elliptical orbit of a satellite platform, and achieve geometric error correction of a star sensors' image star point using multi-parameter screening of the ambiguous solutions of intersection of the elliptic equations. Read More

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December 2018

A Regularized Weighted Smoothed ₀ Norm Minimization Method for Underdetermined Blind Source Separation.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China.

Compressed sensing (CS) theory has attracted widespread attention in recent years and has been widely used in signal and image processing, such as underdetermined blind source separation (UBSS), magnetic resonance imaging (MRI), etc. As the main link of CS, the goal of sparse signal reconstruction is how to recover accurately and effectively the original signal from an underdetermined linear system of equations (ULSE). For this problem, we propose a new algorithm called the weighted regularized smoothed L 0 -norm minimization algorithm (WReSL0). Read More

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December 2018

Energy-Balancing Unequal Clustering Approach to Reduce the Blind Spot Problem in Wireless Sensor Networks (WSNs).

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

Faculty of Computer Science, Dalhousie University, 6050 University Ave., PO Box 15000, Halifax, NS B3H 4R2, Canada.

Wireless Sensor Networks (WSNs) have become a significant part of surveillance techniques. With unequal clustering approaches and multi-hop communication, WSNs can balance energy among the clusters and serve a wide monitoring area. Recent research has shown significant improvements in unequal clustering approaches by forming clusters prior to the selection of cluster heads. Read More

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December 2018

Cooperative Jammer Selection for Secrecy Improvement in Cognitive Internet of Things.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

Department of Information Security Engineering, Soonchunhyang University, Asan-si 31538, Korea.

Smart homes can improve the quality of life and be implemented by Internet of Things (IoT) technologies. However, security is a very important issue in smart homes. For this reason, we propose a secrecy transmission protocol for primary user (PU) by selecting friendly jammer in cognitive IoT model. Read More

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December 2018

Ultrasonic Transmission Tomography Sensor Design for Bubble Identification in Gas-Liquid Bubble Column Reactors.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

School of Automation, Northwestern Polytechnical University, Xi'an 710129, China.

Scientists require methods to monitor the distribution of gas bubbles in gas-liquid bubble column reactors. One non-destructive method that can potential satisfy this requirement in industrial situations is ultrasonic transmission tomography (UTT). In this paper, an ultrasonic transmission tomography sensor is designed for measuring bubble distribution in a reactor. Read More

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December 2018

Dual Path Lock-In System for Elimination of Residual Amplitude Modulation and SNR Enhancement in Photoacoustic Spectroscopy.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, China.

A technique for elimination of residual amplitude modulation (ERAM) in photoacoustic spectroscopy based on dual path lock-in was proposed and experimentally demonstrated. There are two lock-in amplifiers, one is for gas concentration demodulation and another for residual amplitude modulation (RAM) measurement by tuning the reference signal in different phases, and then a dual path lock-in technique based on subtraction is applied to RAM removal, improving the second harmonic profile significantly. In this system, the signal to noise ratio (SNR) increases about two times based on our dual path lock-in technique compared to one distributed feedback laser diode (DFB-LD). Read More

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December 2018

An Eight-Direction Scanning Detection Algorithm for the Mapping Robot Pathfinding in Unknown Indoor Environment.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

School of Remote Sensing & Information Engineering, Wuhan University, Wuhan 430079, China.

Aiming at the problem of how to enable the mobile robot to navigate and traverse efficiently and safely in the unknown indoor environment and map the environment, an eight-direction scanning detection (eDSD) algorithm is proposed as a new pathfinding algorithm. Firstly, we use a laser-based SLAM (Simultaneous Localization and Mapping) algorithm to perform simultaneous localization and mapping to acquire the environment information around the robot. Then, according to the proposed algorithm, the 8 certain areas around the 8 directions which are developed from the robot's center point are analyzed in order to calculate the probabilistic path vector of each area. Read More

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December 2018

Oxidation-Induced Changes in the ALD-Al2O3/InAs(100) Interface and Control of the Changes for Device Processing.

ACS Appl Mater Interfaces 2018 Dec 3. Epub 2018 Dec 3.

InAs crystals are emerging materials for various devices like radio-frequency transistors and infrared sensors. Control of oxidation-induced changes is essential for decreasing amounts of the harmful InAs surface (or interface) defects because it is hard to avoid the energetically favored oxidation of InAs surface parts in device processing. We have characterized atomic-layer-deposition (ALD) grown Al2O3/InAs interfaces, pre-oxidized differently, with synchrotron hard x-ray photoelectron spectroscopy (HAXPES), low-energy electron diffraction, scanning tunneling microscopy, and time-of-flight elastic recoil detection analysis. Read More

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December 2018

ASSESSMENT OF ANNUAL EFFECTIVE DOSE FROM EXPOSURE TO NATURAL RADIOACTIVITY SOURCES IN A CASE-CONTROL STUDY IN BIHOR COUNTY, ROMANIA.

Radiat Prot Dosimetry 2018 Dec 1. Epub 2018 Dec 1.

Radiological Physics and Advisory Division, Bhabha Atomic Research Centre (BARC), Mumbai, India.

The purpose of the article is to evaluate the annual effective dose for 80 women divided into two samples; one sample located in the former uranium Băiţa-Ştei area, hereinafter referred to as case sample, respectively for a control sample, located in the same county, but exposed in most cases to indoor radon activity concentrations <300 Bq m-3. In this regard, the homemade 'RaThoGamma' kit was used, which contained two thermoluminescent dosimeters, a CR-39 track detector (RSKS) for indoor radon activity concentration, two CR-39 track detectors (Radtrak2®/ Radtrak2T®) for radon and thoron activity concentrations as well as Direct Radon Progeny Sensors/Direct Thoron Progeny Sensors for measuring time-averaged radon and thoron progenies concentrations. In addition, a total of 80 water samples were collected in order to evaluate the ingestion dose due to radon and radium activity concentrations in drinking water. Read More

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December 2018

SURVEILLANCE OF ENVIRONMENTAL DOSE RATE WITH THE COVARIANCE MATRIX.

Radiat Prot Dosimetry 2018 Dec 1. Epub 2018 Dec 1.

Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Av. Complutense, 40. Madrid, Spain.

The objective of this study is the operational verification of an environmental dose rate monitoring network composed by several sensors. The verification of the study has been tested on the CIEMAT's Radiological Network, establishing a records quality assurance of the detectors using the covariance matrix and the eigenvalues. The technique has revealed an underlying records malfunction, which have not been appreciated by applying conventional surveillance. Read More

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December 2018

Distinguishing positions and movements in bed from load cell signals.

Physiol Meas 2018 Dec 3;39(12):125001. Epub 2018 Dec 3.

inHealth Measurement Corps, Johns Hopkins University, Baltimore, MD, United States of America.

Objective: To characterize and classify six positions and movements for individuals in a bed using the output signals of four load cell sensors.

Approach: A bed equipped with four load cell sensors and synchronized video was used to assess the load cell response of 54 healthy individuals in prescribed positions and as they moved between positions. Stationary positions were characterized by the signals from the four load cells and the coordinates of the center of mass (CoM). Read More

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December 2018

Unconstrained Estimation of HRV Indices after Removing Respiratory Influences from Heart Rate.

IEEE J Biomed Health Inform 2018 Dec 3. Epub 2018 Dec 3.

Objective: This paper proposes an approach to better estimate the sympathovagal balance (SB) and the respiratory sinus arrhythmia (RSA) after separating respiratory influences from the heart rate (HR).

Methods: The separation is performed using orthogonal subspace projections and the approach is first tested using simulated HR and respiratory signals with different spectral properties. Then, RSA and SB are estimated during autonomic blockade and stress using the proposed approach and the classical heart rate variability (HRV) analysis. Read More

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December 2018

Surface Area Enhancement of Nanomechanical Disk Resonators Using MWCNT for Mass Sensing Applications.

IEEE Trans Ultrason Ferroelectr Freq Control 2018 Nov 30. Epub 2018 Nov 30.

This work presents fabrication of thermal-piezoresistive nanoelectromechanical (NEM) silicon disk resonators and their characterization as highly sensitive mass sensors. Forest of multiwall carbon nanotubes (MWCNT) has been grown on top surface of the fabricated devices increasing the resonator effective surface area, which in turn increases the adsorption capacity and therefore frequency shift of the sensor in molecular or particulate detection applications. To investigate the effect of the enhanced surface area on frequency shift, devices with and without MWCNTs were exposed to an aqueous solution of manganese sulfate for different deposition times and the resonance frequency shift was recorded accordingly. Read More

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November 2018
1 Read

A comprehensive database for benchmarking imaging systems.

IEEE Trans Pattern Anal Mach Intell 2018 Nov 30. Epub 2018 Nov 30.

Cross-modality face recognition is an emerging topic due to the wide-spread usage of different sensors in day-to-day life applications. The development of face recognition systems relies greatly on existing databases for evaluation and obtaining training examples for data-hungry machine learning algorithms. However, currently, there is no publicly available face database that includes more than two modalities for the same subject. Read More

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November 2018
1 Read

Spectral Image Fusion from Compressive Measurements.

IEEE Trans Image Process 2018 Nov 29. Epub 2018 Nov 29.

Compressive spectral imagers reduce the number of sampled pixels by coding and combining the spectral information. However, sampling compressed information with simultaneous high spatial and high spectral resolution demands expensive high-resolution sensors. This work introduces a model allowing data from high spatial/low spectral and low spatial/high spectral resolution compressive sensors to be fused. Read More

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November 2018

Full-Vector Gradient for Multi-spectral or Multivariate Images.

IEEE Trans Image Process 2018 Nov 28. Epub 2018 Nov 28.

Gradient extraction is important for a lot of metrological applications such as Control Quality by Vision. In this work, we propose a full-vector gradient for multi-spectral sensors. The full-vector gradient extends Di Zenzo expression to take into account the non-orthogonality of the acquisition channels thanks to a Gram matrix. Read More

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November 2018

Impact of stainless-steel welding fumes on proteins and non-coding RNAs regulating DNA damage response in the respiratory tract of Sprague-Dawley rats.

J Toxicol Environ Health A 2018 Dec 3:1-15. Epub 2018 Dec 3.

a Department of Biochemistry and Biotechnology, Faculty of Science , Annamalai University , Annamalainagar , TN , India.

Substantial evidence has established the negative impact of inhalation exposure to welding fumes on respiratory functions. The aim of the present study was to investigate the effect of welding fume inhalation on expression of molecules that function as sensors, transducers and effectors of DNA damage response (DDR) in the respiratory tract of male Sprague-Dawley rats. Animals were exposed to 50 mg/m stainless steel welding fumes for 1 h/d for 4, 8, and 12 weeks, respectively. Read More

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December 2018

Supramolecular Luminescent Sensors.

Chem Rev 2018 Dec 3. Epub 2018 Dec 3.

Department of Chemistry , University of Rhode Island , 140 Flagg Road , Kingston , Rhode Island 02881 , United States.

There is great need for stand-alone luminescence-based chemosensors that exemplify selectivity, sensitivity, and applicability and that overcome the challenges that arise from complex, real-world media. Discussed herein are recent developments toward these goals in the field of supramolecular luminescent chemosensors, including macrocycles, polymers, and nanomaterials. Specific focus is placed on the development of new macrocycle hosts since 2010, coupled with considerations of the underlying principles of supramolecular chemistry as well as analytes of interest and common luminophores. Read More

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December 2018

Diagnosis of hepatitis via nanomaterial-based electrochemical, optical or piezoelectrical biosensors: a review on recent advancements.

Mikrochim Acta 2018 Dec 1;185(12):568. Epub 2018 Dec 1.

Pharmaceutical Analysis Research Center, Tabriz University of Medical Sciences, Tabriz, 51664, Iran.

This review (with 145 refs.) summarizes the progress made in the past years in the field of nanomaterial based rapid detection of hepatitis viruses. Following an introduction into the field (with subsection on the significance of hepatitis and on fundamentals of biosensors), conventional methods for detection of hepatitis are discussed, along with their limitationss. Read More

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December 2018
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[Lab on a Chip].

Authors:
Klaus S Drese

Internist (Berl) 2018 Nov 30. Epub 2018 Nov 30.

ISAT - Institut für Sensor- und Aktortechnik, Hochschule für angewandte Wissenschaften Coburg, Am Hofbräuhaus 1b, 96450, Coburg, Deutschland.

Background: Miniaturization has not only driven microelectronics and generated new unforeseen options but has also dramatically changed sensors and analytics.

Developments: The Lab on a Chip (LOC) technology enables laboratory processes to run fully automated in canals in the micrometre range. The biggest challenge for LOC is to keep production costs low despite miniaturization and application-specific design. Read More

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November 2018

Design and synthesis of magnetic nanoparticles for biomedical diagnostics.

Quant Imaging Med Surg 2018 Oct;8(9):957-970

Department of Biomedical Engineering, Faculty of Engineering, National University of Singapore, Singapore 117599, Singapore.

Sensitive and quantitative characterization of clinically relevant biomarkers can facilitate disease diagnosis and treatment evaluation. Magnetic nanomaterials and their biosensing strategies have recently received considerable attention. Magnetic signals experience little interference from native biological background as most biological molecules have negligible magnetic susceptibilities and thus appear transparent to external magnetic fields. Read More

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October 2018
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Mitochondria-targeting drug conjugates for cytotoxic, anti-oxidizing and sensing purposes: current strategies and future perspectives.

Acta Pharm Sin B 2018 Oct 18;8(6):862-880. Epub 2018 May 18.

Department of Pharmacy, Integrated Research Institute of Pharmaceutical Sciences, and BK21 PLUS Team for Creative Leader Program for Pharmacomics-based Future Pharmacy, College of Pharmacy, The Catholic University of Korea, Gyeonggi-do 14662, Republic of Korea.

Mitochondrial targeting is a promising approach for solving current issues in clinical application of chemotherapy and diagnosis of several disorders. Here, we discuss direct conjugation of mitochondrial-targeting moieties to anticancer drugs, antioxidants and sensor molecules. Among them, the most widely applied mitochondrial targeting moiety is triphenylphosphonium (TPP), which is a delocalized cationic lipid that readily accumulates and penetrates through the mitochondrial membrane due to the highly negative mitochondrial membrane potential. Read More

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October 2018
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