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https://www.readbyqxmd.com/read/28922544/flexible-photodetectors-based-on-novel-functional-materials
#1
REVIEW
Chao Xie, Feng Yan
Flexible photodetectors have attracted a great deal of research interest in recent years due to their great possibilities for application in a variety of emerging areas such as flexible, stretchable, implantable, portable, wearable and printed electronics and optoelectronics. Novel functional materials, including materials with zero-dimensional (0D) and one-dimensional (1D) inorganic nanostructures, two-dimensional (2D) layered materials, organic semiconductors and perovskite materials, exhibit appealing electrical and optoelectrical properties, as well as outstanding mechanical flexibility, and have been widely studied as building blocks in cost-effective flexible photodetection...
September 18, 2017: Small
https://www.readbyqxmd.com/read/28922132/design-of-secure-and-lightweight-authentication-protocol-for-wearable-devices-environment
#2
Ashok Kumar Das, Mohammad Wazid, Neeraj Kumar, Muhammad Khurram Khan, Kim-Kwang Raymond Choo, YoungHo Park
Wearable devices are used in various applications to collect information including step information, sleeping cycles, workout statistics, and health related information. Due to the nature and richness of the data collected by such devices, it is important to ensure the security of the collected data. This paper presents a new lightweight authentication scheme suitable for wearable device deployment. The scheme allows a user to mutually authenticate his/her wearable device(s) and the mobile terminal (e.g., Android and iOS device) and establish a session key among these devices (worn and carried by the same user) for secure communication between the wearable device and the mobile terminal...
September 18, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28922112/effects-of-flexible-dry-electrode-design-on-electrodermal-activity-stimulus-response-detection
#3
Peter A Haddad, Amir Servati, Saeid Soltanian, Frank Ko, Peyman Servati
OBJECTIVE: The focus of this research is to evaluate the effects of design parameters including surface area, distance between and geometry of dry flexible electrodes on electrodermal activity (EDA) stimulus response detection. METHODS: EDA is a result of the autonomic nervous system (ANS) being stimulated, which causes sweat and changes the electrical characteristics of the skin. Standard silver/silver chloride (Ag/AgCl) EDA electrodes are rigid and lack conformability in contact with skin...
September 18, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28920434/ultralow-temperature-solution-processed-aluminum-oxide-dielectrics-via-local-structure-control-of-nanoclusters
#4
Jeong-Wan Jo, Yong-Hoon Kim, Joohyung Park, Jae Sang Heo, Seongpil Hwang, Won-June Lee, Myung-Han Yoon, Myung-Gil Kim, Sung Kyu Park
Oxide dielectric materials play a key role in a wide range of high-performance solid-state electronics from semiconductor devices to emerging wearable and soft bio-electronic devices. Although lots of previous advances are noteworthy, their typical processing temperature still far exceeds the thermal limitations of soft materials, impeding their wide utilization in these emerging fields. Here, we report an innovative route to form highly reliable aluminum-oxide dielectric films using an ultralow temperature (< 60 ˚C) solution process with a class of oxide nanocluster precursors...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920174/features-and-effects-of-information-technology-based-interventions-to-improve-self-management-in-chronic-kidney-disease-patients-a-systematic-review-of-the-literature
#5
Fateme Rangraz Jeddi, Ehsan Nabovati, Shahrzad Amirazodi
Slowing down the progression of chronic kidney disease (CKD) and its adverse health outcomes requires the patient's self-management and attention to treatment recommendations. Information technology (IT)-based interventions are increasingly being used to support self-management in patients with chronic diseases such as CKD. We conducted a systematic review of randomized controlled trials (RCTs) to assess the features and effects of IT-based interventions on self-management outcomes of CKD patients. A comprehensive search was conducted in Medline, Scopus, and the Cochrane Library to identify relevant papers that were published until May 2016...
September 18, 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/28920127/incident-angle-controlled-semitransparent-colored-perovskite-solar-cells-with-improved-efficiency-exploiting-a-multilayer-dielectric-mirror
#6
Kyu-Tae Lee, Ji-Yun Jang, Sang Jin Park, Song Ah Ok, Hui Joon Park
See-through perovskite solar cells with high efficiency and iridescent colors are demonstrated by employing a multilayer dielectric mirror. A certain amount of visible light is used for wide color gamut semitransparent color generation, which can be easily tuned by changing an angle of incidence, and a wide range of visible light is efficiently reflected back toward a photoactive layer of the perovskite solar cells by the dielectric mirror for highly efficient light-harvesting performance, thus achieving 10...
September 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28919217/population-based-beat-to-beat-qt-analysis-from-holter-recordings-in-the-long-qt-syndrome
#7
Alex Page, Scott McNitt, Xiaojuan Xia, Wojciech Zareba, Jean-Philippe Couderc
The increasing dissemination of wearable ECG recorders (e.g. Holter, patches, and strap sensors) enables the acquisition of large amounts of data during long periods of time. However, the clinical value of these long-term continuous recordings is hindered by the lack of automatic tools to extract clinically relevant information (other than non-sinus and life-threatening rhythms) from such long-term data, particularly when targeting population-based research. In this work, we propose and test a new tool for analyzing beat-to-beat interval measurements and extracting features from Holter ECGs...
August 10, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28915915/nocturnal-heart-rate-variability-in-1-year-old-infants-analyzed-by-using-the-least-square-cosine-spectrum-method
#8
Yuko Kochiya, Akari Hirabayashi, Yuhei Ichimaru
BACKGROUND: To evaluate the dynamic nature of nocturnal heart rate variability, RR intervals recorded with a wearable heart rate sensor were analyzed using the Least Square Cosine Spectrum Method. METHODS: Six 1-year-old infants participated in the study. A wearable heart rate sensor was placed on their chest to measure RR intervals and 3-axis acceleration. Heartbeat time series were analyzed for every 30 s using the Least Square Cosine Spectrum Method, and an original parameter to quantify the regularity of respiratory-related heart rate rhythm was extracted and referred to as "RA (RA-COSPEC: Respiratory Area obtained by COSPEC)...
September 16, 2017: Journal of Physiological Anthropology
https://www.readbyqxmd.com/read/28912647/accelerometery-and-heart-rate-responses-of-professional-fast-medium-bowlers-in-one-day-and-multi-day-cricket
#9
James A Johnstone, Gerwyn Hughes, Andrew C Mitchell, Paul A Ford, Tim Watson, Rob Duffield, Dan Gordon, Justin D Roberts, Andrew T Garrett
The physical demands of fast-medium bowling are increasingly being recognised, yet comparative exploration of the differing demands between competitive formats (i.e. one-day [OD] versus multi-day [MD] matches) remain minimal. The aim of this study was to describe in-match physiological profiles of professional fast-medium bowlers from England across different versions of competitive matches using a multivariable wearable monitoring device. Seven professional cricket fast-medium bowlers wore the Bioharness(TM) monitoring device during matches, over three seasons (>80 hours in-match)...
September 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28912562/flexible-supercapacitor-electrodes-based-on-real-metal-like-cellulose-papers
#10
Yongmin Ko, Minseong Kwon, Wan Ki Bae, Byeongyong Lee, Seung Woo Lee, Jinhan Cho
The effective implantation of conductive and charge storage materials into flexible frames has been strongly demanded for the development of flexible supercapacitors. Here, we introduce metallic cellulose paper-based supercapacitor electrodes with excellent energy storage performance by minimizing the contact resistance between neighboring metal and/or metal oxide nanoparticles using an assembly approach, called ligand-mediated layer-by-layer assembly. This approach can convert the insulating paper to the highly porous metallic paper with large surface areas that can function as current collectors and nanoparticle reservoirs for supercapacitor electrodes...
September 14, 2017: Nature Communications
https://www.readbyqxmd.com/read/28912238/biological-fabrication-of-cellulose-fibers-with-tailored-properties
#11
Filipe Natalio, Regina Fuchs, Sidney R Cohen, Gregory Leitus, Gerhard Fritz-Popovski, Oskar Paris, Michael Kappl, Hans-Jürgen Butt
Cotton is a promising basis for wearable smart textiles. Current approaches that rely on fiber coatings suffer from function loss during wear. We present an approach that allows biological incorporation of exogenous molecules into cotton fibers to tailor the material's functionality. In vitro model cultures of upland cotton (Gossypium hirsutum) are incubated with 6-carboxyfluorescein-glucose and dysprosium-1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid-glucose, where the glucose moiety acts as a carrier capable of traveling from the vascular connection to the outermost cell layer of the ovule epidermis, becoming incorporated into the cellulose fibers...
September 15, 2017: Science
https://www.readbyqxmd.com/read/28911514/defibrillation-for-ventricular-fibrillation-a-shocking-update
#12
REVIEW
Graham Nichol, Michael R Sayre, Federico Guerra, Jeanne Poole
Cardiac arrest is defined as the termination of cardiac activity associated with loss of consciousness, of spontaneous breathing, and of circulation. Sudden cardiac arrest and sudden cardiac death (SCD) are terms often used interchangeably. Most patients with out-of-hospital cardiac arrest have shown coronary artery disease or symptoms during the hour before the event. Cardiac arrest is potentially reversible by cardiopulmonary resuscitation, defibrillation, cardioversion, cardiac pacing, or treatments targeted at the underlying disease (e...
September 19, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28906431/an-optical-fiber-based-airborne-particle-sensor
#13
Yifan Wang, John F Muth
A new optical-fiber-based airborne particle counter is reported. Unlike traditional light-scatter-based techniques, the particle is detected through the drop in optical fiber coupling efficiency as the particle disrupts the electromagnetic mode of the optical beam. The system is simple, substantially smaller than traditional systems, and does not require high power laser input. This makes it attractive for wearable air quality monitors where size is a premium. There is close agreement between theoretical model and experimental results for solid and liquid particles in the 1 to 10 µm range...
September 14, 2017: Sensors
https://www.readbyqxmd.com/read/28901749/a-highly-stretchable-and-washable-all-yarn-based-self-charging-knitting-power-textile-composed-of-fiber-triboelectric-nanogenerators-and-supercapacitors
#14
Kai Dong, Yi-Cheng Wang, Jianan Deng, Yejing Dai, Steven L Zhang, Haiyang Zou, Bohong Gu, Baozhong Sun, Zhong Lin Wang
Rapid advancements in stretchable and multifunctional wearable electronics impose a challenge on corresponding power devices that they should have comparable portability and stretchability. Here, we report a highly stretchable and washable all-yarn-based self-charging knitting power textile that enables both biomechanical energy harvesting and simultaneously energy storing by hybridizing triboelectrical nanogenerator (TENG) and supercapacitor (SC) into one fabric. With the weft-knitting technique, the power textile is qualified with high elasticity, flexibility, and stretchability, which can adapt to complex mechanical deformations...
September 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28901746/a-lab-on-skin-a-review-of-flexible-and-stretchable-electronics-for-wearable-health-monitoring
#15
Yuhao Liu, Matt Pharr, Giovanni Antonio Salvatore
Skin is the largest organ of the human body, and it offers a diagnostic interface rich with vital biological signals from the inner organs, blood vessels, muscles, and dermis/epidermis. Soft, flexible, and stretchable electronic devices provide a novel platform to interface with soft tissues for robotic feedback and control, regenerative medicine, and continuous health monitoring. Here, we introduce the term "lab-on-skin" to describe a set of electronic devices that have physical properties, such as thickness, thermal mass, elastic modulus, and water-vapor permeability, which resemble those of the skin...
September 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28901736/facile-fabrication-of-flexible-linbo3-piezoelectric-sensor-through-hot-pressing-for-biomechanical-monitoring
#16
Muzhen Xu, Hua Kang, Li Guan, Huayi Li, Meining Zhang
Wearable pressure sensors due to their portability and flexibility, have been attracting increasing attention for biomechanical monitoring. However, although great advances have been made by many efforts, the sensors with good performance produced by facile methods are insufficient. Here, we present a simple method for simple manufacturing one flexible and self-powered piezoelectric sensor based on LiNbO3 (LN) particles. The LN particles are dispersed in polypropylene (PP) doped with multi-walled carbon nanotubes (MWCNTs) through hot-pressing (200°C), forming LN/MWCNTs/PP piezoelectric composite film (PCF) flexible sensor...
September 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28899433/wearable-sensors-to-predict-improvement-following-an-exercise-intervention-in-patients-with-knee-osteoarthritis
#17
Dylan Kobsar, Sean T Osis, Jeffrey E Boyd, Blayne A Hettinga, Reed Ferber
BACKGROUND: Muscle strengthening exercises consistently demonstrate improvements in the pain and function of adults with knee osteoarthritis, but individual response rates can vary greatly. Identifying individuals who are more likely to respond is important in developing more efficient rehabilitation programs for knee osteoarthritis. Therefore, the purpose of this study was to determine if pre-intervention multi-sensor accelerometer data (e.g., back, thigh, shank, foot accelerometers) and patient reported outcome measures (e...
September 12, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28899023/the-circadian-profile-of-epilepsy-improves-seizure-forecasting
#18
Philippa J Karoly, Hoameng Ung, David B Grayden, Levin Kuhlmann, Kent Leyde, Mark J Cook, Dean R Freestone
It is now established that epilepsy is characterized by periodic dynamics that increase seizure likelihood at certain times of day, and which are highly patient-specific. However, these dynamics are not typically incorporated into seizure prediction algorithms due to the difficulty of estimating patient-specific rhythms from relatively short-term or unreliable data sources. This work outlines a novel framework to develop and assess seizure forecasts, and demonstrates that the predictive power of forecasting models is improved by circadian information...
August 1, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28898755/biofuel-cells-activation-of-micro-and-macro-electronic-devices
#19
REVIEW
Maria Gamella, Ashkan Koushanpour, Evgeny Katz
The article represents a short conceptual overview of biofuel cell applications, rather than their design and operation. Special attention is given to interfacing enzyme-based biofuel cells with power consuming microelectronic devices. Importance of electronic management of the power extracted from biological sources is emphasized. In addition to several briefly explained examples collected from recent publications, one system demonstrating powering of a standard glucometer with an implantable or wearable biofuel cell is described in details...
September 7, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28898435/wearable-slot-antenna-at-2-45%C3%A2-ghz-for-off-body-radiation-analysis-of-efficiency-frequency-shift-and-body-absorption
#20
Marta Fernandez, Hugo G Espinosa, David V Thiel, Amaia Arrinda
The interaction of body-worn antennas with the human body causes a significant decrease in antenna efficiency and a shift in resonant frequency. A resonant slot in a small conductive box placed on the body has been shown to reduce these effects. The specific absorption rate is less than international health standards for most wearable antennas due to small transmitter power. This paper reports the linear relationship between power absorbed by biological tissues at different locations on the body and radiation efficiency based on numerical modeling (r = 0...
September 12, 2017: Bioelectromagnetics
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