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https://www.readbyqxmd.com/read/28655219/ultra-narrow-band-perfect-absorber-and-its-application-as-plasmonic-sensor-in-the-visible-region
#1
Dong Wu, Ruifang Li, Yumin Liu, Zhongyuan Yu, Li Yu, Lei Chen, Chang Liu, Rui Ma, Han Ye
We propose and numerically investigate a perfect ultra-narrowband absorber with an absorption bandwidth of only 1.82 nm and an absorption efficiency exceeding 95% in the visible region. We demonstrate that the perfect ultra-narrowband absorption is ascribed to the coupling effect induced by localized surface plasmon resonance. The influence of structural dimensions on the optical performance is also investigated, and the optimal structure is obtained with the extremely low reflectivity (0.001) of the resonance dip...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28654942/jaw-rotation-in-dysarthria-measured-with-a-single-electromagnetic-articulography-sensor
#2
Jeff Berry, Andrew Kolb, James Schroeder, Michael T Johnson
Purpose: This study evaluated a novel method for characterizing jaw rotation using orientation data from a single electromagnetic articulography sensor. This method was optimized for clinical application, and a preliminary examination of clinical feasibility and value was undertaken. Method: The computational adequacy of the single-sensor orientation method was evaluated through comparisons of jaw-rotation histories calculated from dual-sensor positional data for 16 typical talkers...
June 22, 2017: American Journal of Speech-language Pathology
https://www.readbyqxmd.com/read/28654886/bimetallic-pt-au-nanocatalysts-electrochemically-deposited-on-boron-doped-diamond-electrodes-for-nonenzymatic-glucose-detection
#3
Siriwan Nantaphol, Takeshi Watanabe, Naohiro Nomura, Weena Siangproh, Orawon Chailapakul, Yasuaki Einaga
The enormous demand for medical diagnostics has encouraged the fabrication of high- performance sensing platforms for the detection of glucose. Nonenzymatic glucose sensors are coming ever closer to being used in practical applications. Bimetallic catalysts have been shown to be superior to single metal catalysts in that they have greater activity and selectivity. Here, we demonstrate the preparation, characterization, and electrocatalytic characteristics of a new bimetallic Pt/Au nanocatalyst. This nanocatalyst can easily be synthesized by electrodeposition by sequentially depositing Au and Pt on the surface of a boron-doped diamond (BDD) electrode...
June 17, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28654748/preparation-of-poly-styrene-b-poly-acrylic-acid-coupled-carbon-dots-and-their-applications
#4
Moon-Jin Cho, Soo-Young Park
Carbon dots (CDs) are covalently coupled to the polyacrylic acid (PAA) block of polystyrene-b-polyacrylic acid (PS-b-PAA). The produced amphiphilic PS-b-PAA-CD shows excellent solubility and micellar formation in selective solvents. Transmission electron microscopy study shows that the micelle of PS-b-PAA-CD in water (a PAA-selective solvent) has a strawberry-like shape with the CDs as patches on the PAA corona surface although that in toluene (a PS-selective solvent) has a reversed shape with the CDs in the core...
June 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28654638/increased-inspiratory-resistance-affects-the-dynamic-relationship-between-blood-pressure-changes-and-subarachnoid-space-width-oscillations
#5
Magdalena Wszedybyl-Winklewska, Jacek Wolf, Ewa Swierblewska, Katarzyna Kunicka, Kamila Mazur, Marcin Gruszecki, Pawel J Winklewski, Andrzej F Frydrychowski, Leszek Bieniaszewski, Krzysztof Narkiewicz
BACKGROUND AND OBJECTIVE: Respiration is known to affect cerebrospinal fluid (CSF) movement. We hypothesised that increased inspiratory resistance would affect the dynamic relationship between blood pressure (BP) changes and subarachnoid space width (SAS) oscillations. METHODS: Experiments were performed in a group of 20 healthy volunteers undergoing controlled intermittent Mueller Manoeuvres (the key characteristic of the procedure is that a studied person is subjected to a controlled, increased inspiratory resistance which results in marked potentiation of the intrathoracic negative pressure)...
2017: PloS One
https://www.readbyqxmd.com/read/28654423/daily-wrist-activity-classification-using-a-smart-band
#6
Nhan Duc Nguyen, Phuc Huu Truong, Gu-Min Jeong
In this letter, we propose a novel method for classifying daily wrist activities by using a smart band. Triaxial acceleration data are collected by built-in sensors of the smart band during experiments regarding five activities, i.e., texting, calling, placing a hand in a pocket, carrying a suitcase, and swinging a hand. We analyze patterns in the sensor signals during these activities based on three types of features, i.e., norm, norm-variance, and frequency-domain features. After extracting the significant features, a multi-class support vector machine (SVM) algorithm is applied to classify these activities...
June 27, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28654243/mitochondria-targeted-triphenylphosphonium-based-compounds-syntheses-mechanisms-of-action-and-therapeutic-and-diagnostic-applications
#7
Jacek Zielonka, Joy Joseph, Adam Sikora, Micael Hardy, Olivier Ouari, Jeannette Vasquez-Vivar, Gang Cheng, Marcos Lopez, Balaraman Kalyanaraman
Mitochondria are recognized as one of the most important targets for new drug design in cancer, cardiovascular, and neurological diseases. Currently, the most effective way to deliver drugs specifically to mitochondria is by covalent linking a lipophilic cation such as an alkyltriphenylphosphonium moiety to a pharmacophore of interest. Other delocalized lipophilic cations, such as rhodamine, natural and synthetic mitochondria-targeting peptides, and nanoparticle vehicles, have also been used for mitochondrial delivery of small molecules...
June 27, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28654234/single-and-networked-zno-cnt-hybrid-tetrapods-for-selective-room-temperature-high-performance-ammonia-sensors
#8
Fabian Schütt, Vasile Postica, Rainer Adelung, Oleg Lupan
Highly porous hybrid materials with unique high-performance properties have attracted great interest from the scientific community, especially in the field of gas-sensing applications. In this work, tetrapodal-ZnO (ZnO-T) networks were functionalized with carbon nanotubes (CNTs) to form a highly efficient hybrid sensing material (ZnO-T-CNT) for ultrasensitive, selective, and rapid detection of ammonia (NH3) vapor at room temperature. By functionalizing the ZnO-T networks with 2.0 wt % of CNTs by a simple dripping procedure, an increase of 1 order of magnitude in response (from about 37 to 330) was obtained...
June 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28654230/synthesis-of-multifunctional-electrically-tunable-fluorine-doped-reduced-graphene-oxide-at-low-temperatures
#9
Faisal Shahzad, Shabi Abbas Zaidi, Chong Min Koo
Doping with heteroatoms is a well-established method to tune the electronic properties and surface chemistry of graphene. Herein, we demonstrate the synthesis of a fluorine-doped reduced graphene oxide (FrGO) at low temperatures that offers multiple opportunities in applied fields. The as-synthesized FrGO product shows a better electrical conductivity of 750 S m-1 than that of undoped rGO with an electrical conductivity of 195 S m-1. To demonstrate the multifunctional applications of the as-synthesized FrGO, it was examined for electromagnetic interference shielding and electrochemical sensing of histamine as an important food biomarker...
June 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28654105/facile-detection-of-glucose-in-human-serum-employing-silver-ion-guided-surface-enhanced-raman-spectroscopy-signal-amplification
#10
Cuicui Fu, Sila Jin, Joohee Oh, Shuping Xu, Young Mee Jung
A facile surface-enhanced Raman scattering (SERS) sensor based on a silver-ion-mediated amplification effect was designed for the determination of glucose concentration. In this approach, 4-aminothiophenol (4-ATP) molecules assembled on the surface of a gold wafer (Au wafer@4-ATP) act not only as Raman tags but also as linkage agents. Silver nanoparticles marked with cysteamine (AgNP@cys) were used as the SERS enhancement components because they could be bound to the Au wafer@4-ATP in the presence of silver ions through the formation of N → Ag(+) ← N coordination compounds...
June 27, 2017: Analyst
https://www.readbyqxmd.com/read/28654086/a-multiscale-dataset-for-understanding-complex-eco-hydrological-processes-in-a-heterogeneous-oasis-system
#11
Xin Li, Shaomin Liu, Qin Xiao, Mingguo Ma, Rui Jin, Tao Che, Weizhen Wang, Xiaoli Hu, Ziwei Xu, Jianguang Wen, Liangxu Wang
We introduce a multiscale dataset obtained from Heihe Watershed Allied Telemetry Experimental Research (HiWATER) in an oasis-desert area in 2012. Upscaling of eco-hydrological processes on a heterogeneous surface is a grand challenge. Progress in this field is hindered by the poor availability of multiscale observations. HiWATER is an experiment designed to address this challenge through instrumentation on hierarchically nested scales to obtain multiscale and multidisciplinary data. The HiWATER observation system consists of a flux observation matrix of eddy covariance towers, large aperture scintillometers, and automatic meteorological stations; an eco-hydrological sensor network of soil moisture and leaf area index; hyper-resolution airborne remote sensing using LiDAR, imaging spectrometer, multi-angle thermal imager, and L-band microwave radiometer; and synchronical ground measurements of vegetation dynamics, and photosynthesis processes...
June 27, 2017: Scientific Data
https://www.readbyqxmd.com/read/28654068/fabrication-of-3d-carbon-microelectromechanical-systems-c-mems
#12
Bidhan Pramanick, Sergio O Martinez-Chapa, Marc Madou, Hyundoo Hwang
A wide range of carbon sources are available in nature, with a variety of micro-/nanostructure configurations. Here, a novel technique to fabricate long and hollow glassy carbon microfibers derived from human hairs is introduced. The long and hollow carbon structures were made by the pyrolysis of human hair at 900 °C in a N2 atmosphere. The morphology and chemical composition of natural and pyrolyzed human hairs were investigated using scanning electron microscopy (SEM) and electron-dispersive X-ray spectroscopy (EDX), respectively, to estimate the physical and chemical changes due to pyrolysis...
June 17, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28654064/detection-and-visualization-of-dna-damage-induced-protein-complexes-in-suspension-cell-cultures-using-the-proximity-ligation-assay
#13
Mahnoush Bahjat, Timon A Bloedjes, Amélie van der Veen, Guus de Wilde, Chiel Maas, Jeroen E J Guikema
The DNA damage response orchestrates the repair of DNA lesions that occur spontaneously, are caused by genotoxic stress, or appear in the context of programmed DNA breaks in lymphocytes. The Ataxia-Telangiectasia Mutated kinase (ATM), ATM- and Rad3-Related kinase (ATR) and the catalytic subunit of DNA-dependent Protein Kinase (DNA-PKcs) are among the first that are activated upon induction of DNA damage, and are central regulators of a network that controls DNA repair, apoptosis and cell survival. As part of a tumor-suppressive pathway, ATM and ATR activate p53 through phosphorylation, thereby regulating the transcriptional activity of p53...
June 9, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28654063/a-tissue-displacement-based-contusive-spinal-cord-injury-model-in-mice
#14
Xiangbing Wu, Yi Ping Zhang, Wenrui Qu, Lisa B E Shields, Christopher B Shields, Xiao-Ming Xu
Producing a consistent and reproducible contusive spinal cord injury (SCI) is critical to minimizing behavioral and histological variabilities between experimental animals. Several contusive SCI models have been developed to produce injuries using different mechanisms. The severity of the SCI is based on the height that a given weight is dropped, the injury force, or the spinal cord displacement. In the current study, we introduce a novel mouse contusive SCI device, the Louisville Injury System Apparatus (LISA) impactor, which can create a displacement-based SCI with high injury velocity and accuracy...
June 18, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28654054/construction-and-setup-of-a-bench-scale-algal-photosynthetic-bioreactor-with-temperature-light-and-ph-monitoring-for-kinetic-growth-tests
#15
Amanda L Karam, Catherine C McMillan, Yi-Chun Lai, Francis L de Los Reyes, Heike W Sederoff, Amy M Grunden, Ranji S Ranjithan, James W Levis, Joel J Ducoste
The optimal design and operation of photosynthetic bioreactors (PBRs) for microalgal cultivation is essential for improving the environmental and economic performance of microalgae-based biofuel production. Models that estimate microalgal growth under different conditions can help to optimize PBR design and operation. To be effective, the growth parameters used in these models must be accurately determined. Algal growth experiments are often constrained by the dynamic nature of the culture environment, and control systems are needed to accurately determine the kinetic parameters...
June 14, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28654033/scanning-light-scattering-profiler-slps-based-methodology-to-quantitatively-evaluate-forward-and-backward-light-scattering-from-intraocular-lenses
#16
Bennett N Walker, Robert H James, Don Calogero, Ilko K Ilev
The scanning light scattering profiler (SLSP) methodology has been developed for the full-angle quantitative evaluation of forward and backward light scattering from intraocular lenses (IOLs) using goniophotometer principles. This protocol describes the SLSP platform and how it employs a 360° rotational photodetector sensor that is scanned around an IOL sample while recording the intensity and location of scattered light as it passes through the IOL medium. The SLSP platform can be used to predict, non-clinically, the propensity for current and novel IOL designs and materials to induce light scatter...
June 6, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28654006/algorithms-for-lightweight-key-exchange-%C3%A2
#17
Rafael Alvarez, Cándido Caballero-Gil, Juan Santonja, Antonio Zamora
Public-key cryptography is too slow for general purpose encryption, with most applications limiting its use as much as possible. Some secure protocols, especially those that enable forward secrecy, make a much heavier use of public-key cryptography, increasing the demand for lightweight cryptosystems that can be implemented in low powered or mobile devices. This performance requirements are even more significant in critical infrastructure and emergency scenarios where peer-to-peer networks are deployed for increased availability and resiliency...
June 27, 2017: Sensors
https://www.readbyqxmd.com/read/28654003/a-force-sensing-system-on-legs-for-biomimetic-hexapod-robots-interacting-with-unstructured-terrain
#18
He Zhang, Rui Wu, Changle Li, Xizhe Zang, Xuehe Zhang, Hongzhe Jin, Jie Zhao
The tiger beetle can maintain its stability by controlling the interaction force between its legs and an unstructured terrain while it runs. The biomimetic hexapod robot mimics a tiger beetle, and a comprehensive force sensing system combined with certain algorithms can provide force information that can help the robot understand the unstructured terrain that it interacts with. This study introduces a complicated leg force sensing system for a hexapod robot that is the same for all six legs. First, the layout and configuration of sensing system are designed according to the structure and sizes of legs...
June 27, 2017: Sensors
https://www.readbyqxmd.com/read/28654002/integration-of-sensors-controllers-and-instruments-using-a-novel-opc-architecture
#19
Isaías González, Antonio José Calderón, Antonio Javier Barragán, José Manuel Andújar
The interconnection between sensors, controllers and instruments through a communication network plays a vital role in the performance and effectiveness of a control system. Since its inception in the 90s, the Object Linking and Embedding for Process Control (OPC) protocol has provided open connectivity for monitoring and automation systems. It has been widely used in several environments such as industrial facilities, building and energy automation, engineering education and many others. This paper presents a novel OPC-based architecture to implement automation systems devoted to R&D and educational activities...
June 27, 2017: Sensors
https://www.readbyqxmd.com/read/28653992/flexible-packaging-by-film-assisted-molding-for-microintegration-of-inertia-sensors
#20
Daniel Hera, Armin Berndt, Thomas Günther, Stephan Schmiel, Christine Harendt, André Zimmermann
Packaging represents an important part in the microintegration of sensors based on microelectromechanical system (MEMS). Besides miniaturization and integration density, functionality and reliability in combination with flexibility in packaging design at moderate costs and consequently high-mix, low-volume production are the main requirements for future solutions in packaging. This study investigates possibilities employing printed circuit board (PCB-)based assemblies to provide high flexibility for circuit designs together with film assisted transfer molding (FAM) to package sensors...
June 27, 2017: Sensors
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