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https://www.readbyqxmd.com/read/29346282/smartphone-based-cooperative-indoor-localization-with-rfid-technology
#1
Fernando Seco, Antonio R Jiménez
In GPS-denied indoor environments, localization and tracking of people can be achieved with a mobile device such as a smartphone by processing the received signal strength (RSS) of RF signals emitted from known location beacons (anchor nodes), combined with Pedestrian Dead Reckoning (PDR) estimates of the user motion. An enhacement of this localization technique is feasible if the users themselves carry additional RF emitters (mobile nodes), and the cooperative position estimates of a group of persons incorporate the RSS measurements exchanged between users...
January 18, 2018: Sensors
https://www.readbyqxmd.com/read/29346156/developing-a-mobile-app-for-prevention-and-treatment-of-pressure-injuries
#2
Geraldo Magela Salomé, Lydia Masako Ferreira
OBJECTIVE: This descriptive study describes the planning and development of a mobile application (app) for prevention and treatment of pressure injuries for use by providers in a university research center. The app delineates risk factors for pressure injury development, provides an evaluation of the wound, recommends wound cleansing procedures, performs pressure injury staging, and recommends treatment interventions. METHODS: A mobile app was developed using a contextualized instructional design, which involves a constructivist proposal and planning, developing, and applying specific didactic situations, thus incorporating mechanisms that favor contextualization...
February 2018: Advances in Skin & Wound Care
https://www.readbyqxmd.com/read/29345949/surface-state-dynamics-dictating-transport-in-inas-nanowires
#3
David Lynall, Selvakumar V Nair, David Gutstein, Alexander Shik, Igor Savelyev, Marina Blumin, Harry E Ruda
Because of their high aspect ratio, nanostructures are particularly susceptible to effects from surfaces such as slow electron trapping by surface states. However, non-equilibrium trapping dynamics have been largely overlooked when considering transport in nanoelectronic devices. In this study, we demonstrate the profound influence of dynamic trapping processes on transport in InAs nanowires through an investigation of the hysteretic and time-dependent behaviour of the transconductance. We observe large densities (∽1013 cm-2) of slow surface traps and demonstrate the ability to control and permanently fix their occupation and charge through electrostatic manipulation by the gate potential followed by thermal deactivation by cryogenic cooling...
January 18, 2018: Nano Letters
https://www.readbyqxmd.com/read/29345627/large-area-synthesis-and-photoelectric-properties-of-few-layered-mose-sub-2-sub-on-molybdenum-foils
#4
Zenghui Wu, Guoan Tai, Xufeng Wang, Tingsong Hu, Rui Wang, Wanlin Guo
Compared with MoS2 and WS2, the selenide analogues have narrower band gaps and higher electron mobilities, which make them more applicable to real electrical devices. Besides, few-layered metal selenides have higher electrical conductivity, carrier mobility and light absorption than the corresponding monolayers. However, the large-scale and high-quality growth of few-layered metal selenides remains a significant challenge. Here, we develop a facile method to grow large-area and highly-crystalline few-layered MoSe2 by directly selenizing the Mo foil surfaces at 550 oC within 60 min under ambient pressure...
January 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29345471/synthesis-and-properties-of-dithiafulvenyl-functionalized-spiro-fluorene-9-9-xanthene-molecules
#5
Min Wu, Juan Li, Ruqin Zhang, Xia Tian, Zhaoxiang Han, Xiaoqing Lu, Kunpeng Guo, Zhike Liu, Zhongqiang Wang
Two spiroannulated molecular structures with dithiafulvenyl units functionalized at the 2,2',7,7'- (SFX-DTF1) and 2,3',6,'7- (SFX-DTF2) positions of a spiro[fluorene-9,9'-xanthene] core were synthesized. Studies revealed the hole mobility was significantly influenced by the dithiafulvenyl functionalized positions in the molecular structure. To explore their primary applications as hole-transporting materials in perovskite solar cells, SFX-DTF1-based devices exhibited a power conversion efficiency of 10.67% without the use of p-type dopants, yielding good air stability...
January 18, 2018: Organic Letters
https://www.readbyqxmd.com/read/29345430/wearable-wireless-tyrosinase-bandage-and-microneedle-sensors-toward-melanoma-screening
#6
Bianca Ciui, Aida Martin, Rupesh K Mishra, Barbara Brunetti, Tatsuo Nakagawa, Thomas J Dawkins, Mengjia Lyu, Cecilia Cristea, Robert Sandulescu, Joseph Wang
Wearable bendable bandage-based sensor and a minimally invasive microneedle biosensor are described toward rapid screening of skin melanoma. These wearable electrochemical sensors are capable of detecting the presence of the tyrosinase (TYR) enzyme cancer biomarker in the presence of its catechol substrate, immobilized on the transducer surface. In the presence of the surface TYR biomarker, the immobilized catechol is rapidly converted to benzoquinone that is detected amperometrically, with a current signal proportional to the TYR level...
January 18, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29345386/quinoline-flanked-diketopyrrolopyrrole-copolymers-breaking-through-electron-mobility-over-6-cm2-v-1-s-1-in-flexible-thin-film-devices
#7
Zhenjie Ni, Huanli Dong, Hanlin Wang, Shang Ding, Ye Zou, Qiang Zhao, Yonggang Zhen, Feng Liu, Lang Jiang, Wenping Hu
Herein, the design and synthesis of novel π-extended quinoline-flanked diketopyrrolopyrrole (DPP) [abbreviated as QDPP] motifs and corresponding copolymers named PQDPP-T and PQDPP-2FT for high performing n-type organic field-effect transistors (OFETs) in flexible organic thin film devices are reported. Serving as DPP-flankers in backbones, quinoline is found to effectively tune copolymer optoelectric properties. Compared with TDPP and pyridine-flanked DPP (PyDPP) analogs, widened bandgaps and strengthened electron deficiency are achieved...
January 18, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29345131/photolithography-based-nanopatterning-using-re-entrant-photoresist-profile
#8
Tong Kim, Yei Hwan Jung, Huilong Zhang, Kwangeun Kim, Juhwan Lee, Zhenqiang Ma
Photolithography based on optical mask is widely used in academic research laboratories due to its low-cost, simple mechanism, and ability to pattern in micron sized features on a wafer scale area. Since the resolution is bound by diffraction limits of the light source, nano-scale patterning using photolithography requires short wavelength light source combined with sophisticated optical elements, adding complexity and cost. In this paper, a novel method of sub-wavelength patterning process using conventional i-line mercury lamp is introduced, without the use of such advanced optical tools...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29343883/magnetoelectric-effect-in-nanogranular-feco-mgf-films-at-ghz-frequencies
#9
Kenji Ikeda, Nobukiyo Kobayashi, Ken-Ichi Arai, Shin Yabukami
The magnetoelectric effect is a key issue for material science and is particularly significant in the high frequency band, where it is indispensable in industrial applications. Here, we present for the first time, a study of the high frequency tunneling magneto-dielectric (TMD) effect in nanogranular FeCo-MgF films, consisting of nanometer-sized magnetic FeCo granules dispersed in an MgF insulator matrix. Dielectric relaxation and the TMD effect are confirmed at frequencies over 10 MHz. The frequency dependence of dielectric relaxation is described by the Debye-Fröhlich model, taking relaxation time dispersion into account, which reflects variations in the nature of the microstructure, such as granule size, and the inter-spacing between the granules that affect the dielectric response...
January 15, 2018: Journal of Magnetism and Magnetic Materials
https://www.readbyqxmd.com/read/29341881/clinical-implications-of-technological-advances-in-screening-for-atrial-fibrillation
#10
REVIEW
Nikhil Singh, Sung Chun, David Hadley, Victor Froelicher
The incidence of atrial fibrillation (AF) continues to increase worldwide as people live longer. AF is the leading cause of stroke among patients older than 75 years and is responsible for at least 15% of all strokes. Industry has responded to this problem with a plethora of monitoring devices. These include single lead ECG adhesive sensors, implantable loop recorders, smartphone attachments and wearables. This review will concentrate on clinical studies using these technologies. There are wearables including watches and watch-like devices that will be mentioned but these have not been validated for clinical use...
January 13, 2018: Progress in Cardiovascular Diseases
https://www.readbyqxmd.com/read/29341720/magnetic-skyrmions-and-skyrmion-clusters-in-the-helical-phase-of-cu_-2-oseo_-3
#11
Jan Müller, Jayaraman Rajeswari, Ping Huang, Yoshie Murooka, Henrik M Rønnow, Fabrizio Carbone, Achim Rosch
Skyrmions are nanometric spin whirls that can be stabilized in magnets lacking inversion symmetry. The properties of isolated Skyrmions embedded in a ferromagnetic background have been intensively studied. We show that single Skyrmions and clusters of Skyrmions can also form in the helical phase and investigate theoretically their energetics and dynamics. The helical background provides natural one-dimensional channels along which a Skyrmion can move rapidly. In contrast to Skyrmions in ferromagnets, the Skyrmion-Skyrmion interaction has a strong attractive component and thus Skyrmions tend to form clusters with characteristic shapes...
September 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341601/determining-double-bond-position-in-lipids-using-online-ozonolysis-coupled-to-liquid-chromatography-and-ion-mobility-mass-spectrometry
#12
Rachel A Harris, Jody C May, Craig A Stinson, Yu Xia, John A McLean
The increasing focus on lipid metabolism has revealed a need for analytical techniques capable of structurally characterizing lipids with a high degree of specificity. Lipids can exist as any one of a large number of double bond positional isomers, which are indistinguishable by single-stage mass spectrometry alone. Ozonolysis reactions coupled to mass spectrometry have previously been demonstrated as a means for localizing double bonds in unsaturated lipids. Here we describe an online, solution-phase reactor using ozone produced via a low-pressure mercury lamp, which generates aldehyde products diagnostic of cleavage at a particular double bond position...
January 17, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29339566/graphene-dirac-point-tuned-by-ferroelectric-polarization-field
#13
Xudong Wang, Yan Chen, Guangjian Wu, Jianlu Wang, Bobo Tian, Shuo Sun, Hong Shen, Tie Lin, Wei-Da Hu, Tingting Kang, Minghua Tang, Yongguang Xiao, Jinglan Sun, Xiangjian Meng, Junhao Chu
Graphene has received numerous attention for future nanoelectronics and optoelectronics. The Dirac point is a key parameter of graphene that provides information about its carrier properties. There are lots of methods to tune the Dirac point of graphene, such as chemical doping, impurities, defects, and disorder. In this study, we report a different approach to tune the Dirac point of graphene using a ferroelectric polarization field. The Dirac point can be adjusted to near the ferroelectric coercive voltage regardless its original position...
January 17, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29338884/cervical-proprioception-in-a-young-population-who-spend-long-periods-on-mobile-devices-a-2-group-comparative-observational-study
#14
Andrew Portelli, Susan A Reid
OBJECTIVES: The purpose of this study was to evaluate if young people with insidious-onset neck pain who spend long periods on mobile electronic devices (known as "text neck") have impaired cervical proprioception and if this is related to time on devices. METHODS: A 2-group comparative observational study was conducted at an Australian university. Twenty-two participants with text neck and 22 asymptomatic controls, all of whom were 18 to 35 years old and spent ≥4 hours per day on unsupported electronic devices, were assessed using the head repositioning accuracy (HRA) test...
January 12, 2018: Journal of Manipulative and Physiological Therapeutics
https://www.readbyqxmd.com/read/29338695/novel-sensing-technology-in-fall-risk-assessment-in-older-adults-a-systematic-review
#15
Ruopeng Sun, Jacob J Sosnoff
BACKGROUND: Falls are a major health problem for older adults with significant physical and psychological consequences. A first step of successful fall prevention is to identify those at risk of falling. Recent advancement in sensing technology offers the possibility of objective, low-cost and easy-to-implement fall risk assessment. The objective of this systematic review is to assess the current state of sensing technology on providing objective fall risk assessment in older adults. METHODS: A systematic review was conducted in accordance to the Preferred Reporting Items for Systematic Reviews and Meta-Analysis statement (PRISMA)...
January 16, 2018: BMC Geriatrics
https://www.readbyqxmd.com/read/29338691/morca-ubiquitous-access-to-life-science-web-services
#16
Sergio Diaz-Del-Pino, Oswaldo Trelles, Juan Falgueras
BACKGROUND: Technical advances in mobile devices such as smartphones and tablets have produced an extraordinary increase in their use around the world and have become part of our daily lives. The possibility of carrying these devices in a pocket, particularly mobile phones, has enabled ubiquitous access to Internet resources. Furthermore, in the life sciences world there has been a vast proliferation of data types and services that finish as Web Services. This suggests the need for research into mobile clients to deal with life sciences applications for effective usage and exploitation...
January 16, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29338249/highly-sensitive-and-wearable-in2o3-nanoribbon-transistor-biosensors-with-integrated-on-chip-gate-for-glucose-monitoring-in-body-fluids
#17
Qingzhou Liu, Yihang Liu, Fanqi Wu, Xuan Cao, Zhen Li, Mervat Alharbi, Ahmad N Abbas, Moh R Amer, Chongwu Zhou
Nanoribbon- and nanowire-based field-effect transistor (FET) biosensors have stimulated a lot of interest. However, most FET biosensors were achieved by using bulky Ag/AgCl electrodes or metal wire gates, which have prevented the biosensors from becoming truly wearable. Here, we demonstrate highly sensitive and conformal In2O3 nanoribbon FET biosensors with a fully integrated on-chip gold side gate, which have been laminated onto various surfaces, such as artificial arms and watches, and have enabled glucose detection in various body fluids, such as sweat and saliva...
January 17, 2018: ACS Nano
https://www.readbyqxmd.com/read/29338181/attaining-melt-processing-of-complementary-semiconducting-polymer-blends-at-130-%C3%A2-c-via-sidechain-engineering
#18
Aristide Gumyusenge, Xikang Zhao, Yan Zhao, Jianguo Mei
Complementary semiconducting polymer blends (c-SPBs) have been proposed and tested to achieve melt-processed high performance organic field-effect transistors (OFETs). Prior to this study, melt-processing requires temperatures as high as 180 °C. To implement this technique into low-cost and large-area thin film manufacturing for flexible organic electronics, semiconducting materials meltable at temperatures tolerable by ubiquitous plastic substrates are still needed. We report here the design and melt-processing of a c-SPB consisting of a matrix polymer (DPP-C5) and its fully conjugated analogue...
January 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29337892/improving-remote-health-monitoring-a-low-complexity-ecg-compression-approach
#19
Mohamed Elgendi, Abdulla Al-Ali, Amr Mohamed, Rabab Ward
Recent advances in mobile technology have created a shift towards using battery-driven devices in remote monitoring settings and smart homes. Clinicians are carrying out diagnostic and screening procedures based on the electrocardiogram (ECG) signals collected remotely for outpatients who need continuous monitoring. High-speed transmission and analysis of large recorded ECG signals are essential, especially with the increased use of battery-powered devices. Exploring low-power alternative compression methodologies that have high efficiency and that enable ECG signal collection, transmission, and analysis in a smart home or remote location is required...
January 16, 2018: Diagnostics
https://www.readbyqxmd.com/read/29337367/correlation-of-simulation-finite-element-analysis-to-the-separation-of-intrinsically-magnetic-spores-and-red-blood-cells-using-a-microfluidic-magnetic-deposition-system
#20
Jianxin Sun, L Moore, Wei Xue, James Kim, Maciej Zborowski, Jeffrey J Chalmers
Magnetic separation of cells has been, and continues to be, widely used in a variety of applications, ranging from healthcare diagnostics to detection of food contamination. Typical, these technologies require cells labeled with antibody magnetic particle conjugate and a high magnetic energy gradient created in the flow containing the labeled cells (i.e. a column packed with magnetically inducible material), or dense packing of magnetic particles next to the flow cell. Such designs while creating high magnetic energy gradients, are not amenable to easy, highly detailed, mathematic characterization...
January 16, 2018: Biotechnology and Bioengineering
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