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https://www.readbyqxmd.com/read/29775276/fully-printed-organic-inorganic-nanocomposites-for-flexible-thermoelectric-applications
#1
Canlin Ou, Abhijeet Laxman Sangle, Anuja Datta, Qingshen Jing, Tommaso Busolo, Thomas Chalklen, Vijay Narayan, Sohini Kar-Narayan
Thermoelectric materials, capable of interconverting heat and electricity, are attractive for applications in thermal energy harvesting as a means to power wireless sensors, wearable devices and portable electronics. However, traditional inorganic thermoelectric materials pose significant challenges due to high cost, toxicity, scarcity, as well as brittleness particularly when it comes to applications requiring flexibility. Here, we investigate organic-inorganic nanocomposites that have been developed from bespoke inks which are printed via an aerosol jet printing method onto flexible substrates...
May 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29774921/a-flexible-pressure-sensor-based-on-rgo-polyaniline-wrapped-sponge-with-tunable-sensitivity-for-human-motion-detection
#2
Gang Ge, Yichen Cai, Qiuchun Dong, Yizhou Zhang, Jinjun Shao, Wei Huang, Xiaochen Dong
High-performance stretchable and wearable electronic skins (E-skins) with high sensitivity and a large sensing range are urgently required with the rapid development of the Internet of things and artificial intelligence. Herein, a reduced graphene oxide (rGO)/polyaniline wrapped sponge is prepared via rGO coating and the in situ synthesis of polyaniline nanowires (PANI NWs) on the backbones of sponge for the fabrication of pressure sensors. From the as-prepared flexible sensor, tunable sensitivity (0.042 to 0...
May 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29772779/sober-mcs-sociability-oriented-and-battery-efficient-recruitment-for-mobile-crowd-sensing
#3
Fazel Anjomshoa, Burak Kantarci
The Internet of Things (IoT) concept is aiming at being an integral part of the next generation networking services by introducing pervasiveness and ubiquitous interconnectivity of uniquely-identifiable objects. The massive availability of personalized smart devices such as smartphones and wearables enable their penetration into the IoT ecosystem with their built-in sensors, particularly in Mobile Crowd-Sensing (MCS) campaigns. The MCS systems achieve the objectives of the large-scale non-dedicated sensing concept in the IoT if a sufficient number of participants are engaged to the collaborative data acquisition process...
May 17, 2018: Sensors
https://www.readbyqxmd.com/read/29771494/screen-printed-washable-electronic-textiles-as-self-powered-touch-gesture-tribo-sensor-for-intelligent-human-machine-interaction
#4
Ran Cao, Xianjie Pu, Xinyu Du, Wei Yang, Jiaona Wang, Hengyu Guo, Shuyu Zhao, Zuqing Yuan, Chi Zhang, Congju Li, Zhong Lin Wang
Electronic textile (E-textile) with designable electric circuit and multi-functionalities holds great application prospect for future wearable electronics. However, most of the E-textiles still have critical challenges, including air permeability, satisfactory washability and massive fabrication. In this work, we fabricate a washable E-textile that addresses all of the concerns and show its application as a self-powered triboelectric gesture textile for intelligent human-machine interface. Utilizing conductive carbon nanotubes (CNTs) and screen-printing technology, this kind of E-textile embraces high conductivity (0...
May 17, 2018: ACS Nano
https://www.readbyqxmd.com/read/29767510/non-enzymatic-wearable-sensor-for-electrochemical-analysis-of-perspiration-glucose
#5
Xiaofei Zhu, Yinhui Ju, Jian Chen, Deye Liu, Hong Liu
We report a non-enzymatic wearable sensor for electrochemical analysis of perspiration glucose. Multi-potential steps are applied on a Au electrode, including a high negative pretreatment potential step for proton reduction which produc-es a localized alkaline condition, a moderate potential step for electrocatalytic oxidation of glucose under the alkaline condi-tion, and a positive potential step to clean and reactivate the electrode surface for the next detection. Fluorocarbon-based materials were coated on the Au electrode for improving the selectivity and robustness of the sensor...
May 16, 2018: ACS Sensors
https://www.readbyqxmd.com/read/29762541/biomechanical-gait-variable-estimation-using-wearable-sensors-after-unilateral-total-knee-arthroplasty
#6
Ik-Hyun Youn, Jong-Hoon Youn, Joseph A Zeni, Brian A Knarr
Total knee arthroplasty is a common surgical treatment for end-stage osteoarthritis of the knee. The majority of existing studies that have explored the relationship between recovery and gait biomechanics have been conducted in laboratory settings. However, seamless gait parameter monitoring in real-world conditions may provide a better understanding of recovery post-surgery. The purpose of this study was to estimate kinematic and kinetic gait variables using two ankle-worn wearable sensors in individuals after unilateral total knee arthroplasty...
May 15, 2018: Sensors
https://www.readbyqxmd.com/read/29758958/the-non-contact-biometric-identified-bio-signal-measurement-sensor-and-algorithms
#7
Chan-Il Kim, Jong-Ha Lee
In these days, wearable devices have been developed for effectively measuring biological data. However, these devices have tissue allege and noise problem. To solve these problems, biometric measurement based on a non-contact method, such as face image sequencing is developed. This makes it possible to measure biometric data without any operation and side effects. However, it is impossible for a remote center to identify the person whose data are measured by the novel methods. In this paper, we propose the novel non-contact heart rate and blood pressure imaging system, Deep Health Eye...
April 25, 2018: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/29757261/design-of-an-inertial-sensor-based-data-glove-for-hand-function-evaluation
#8
Bor-Shing Lin, I-Jung Lee, Shu-Yu Yang, Yi-Chiang Lo, Junghsi Lee, Jean-Lon Chen
Capturing hand motions for hand function evaluations is essential in the medical field. Various data gloves have been developed for rehabilitation and manual dexterity assessments. This study proposed a modular data glove with 9-axis inertial measurement units (IMUs) to obtain static and dynamic parameters during hand function evaluation. A sensor fusion algorithm is used to calculate the range of motion of joints. The data glove is designed to have low cost, easy wearability, and high reliability. Owing to the modular design, the IMU board is independent and extensible and can be used with various microcontrollers to realize more medical applications...
May 13, 2018: Sensors
https://www.readbyqxmd.com/read/29756768/a-facile-soaking-strategy-towards-simultaneously-enhanced-conductivity-and-toughness-of-self-healing-composite-hydrogels-through-constructing-multiple-noncovalent-interactions
#9
Shuting Wang, Guoqiang Guo, Xiaoxuan Lu, Shaomin Ji, Guoxin Tan, Liang Gao
Tough and stretchable conductive hydrogels are desirable for the emerging field of wearable and implanted electronics. Unfortunately, most existing conductive hydrogels have low mechanical strength. Current strategies to enhance mechanical properties include employing tough host gel matrices or introducing specific interaction between conductive polymer and host gel matrices. However, these strategies often involve additional complicated processes. Here, a simple yet effective soaking treatment is employed to concurrently enhance mechanical and conductive properties, both of which can be facilely tailored by controlling the soaking duration...
May 14, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29752666/lung-water-assessment-from-gravimetry-to-wearables
#10
Frederic Michard
Several techniques are now available to detect and quantify pulmonary edema, from the laboratory postmortem method (gravimetry) to non-invasive wearable sensors. In critically ill patients with adult respiratory distress syndrome (ARDS), computed tomography scans are often performed to visualize lung lesions and quantify lung aeration, but their value seems somewhat limited to quantify pulmonary edema on a routine basis and of course to track changes with therapy. In this context, transpulmonary thermodilution is a convenient technique...
May 11, 2018: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29752345/randomized-outpatient-trial-of-single-and-dual-hormone-closed-loop-systems-that-adapt-to-exercise-using-wearable-sensors
#11
Jessica R Castle, Joseph El Youssef, Leah M Wilson, Ravi Reddy, Navid Resalat, Deborah Branigan, Katrina Ramsey, Joseph Leitschuh, Uma Rajhbeharrysingh, Brian Senf, Samuel M Sugerman, Virginia Gabo, Peter G Jacobs
OBJECTIVE: Automated insulin delivery is the new standard for type 1 diabetes, but exercise-related hypoglycemia remains a challenge. Our aim was to determine whether a dual-hormone closed-loop system using wearable sensors to detect exercise and adjust dosing to reduce exercise-related hypoglycemia would outperform other forms of closed-loop and open-loop therapy. RESEARCH DESIGN AND METHODS: Participants underwent four arms in randomized order: dual-hormone, single-hormone, predictive low glucose suspend, and continuation of current care over 4 outpatient days...
May 11, 2018: Diabetes Care
https://www.readbyqxmd.com/read/29751811/peripheral-vascular-disease-assessment-in-the-lower-limb-a-review-of-current-and-emerging-non-invasive-diagnostic-methods
#12
REVIEW
Elham Shabani Varaki, Gaetano D Gargiulo, Stefania Penkala, Paul P Breen
BACKGROUND: Worldwide, at least 200 million people are affected by peripheral vascular diseases (PVDs), including peripheral arterial disease (PAD), chronic venous insufficiency (CVI) and deep vein thrombosis (DVT). The high prevalence and serious consequences of PVDs have led to the development of several diagnostic tools and clinical guidelines to assist timely diagnosis and patient management. Given the increasing number of diagnostic methods available, a comprehensive review of available technologies is timely in order to understand their limitations and direct future development effort...
May 11, 2018: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29750502/wearable-contact-lens-biosensors-for-continuous-glucose-monitoring-using-smartphones
#13
Mohamed Elsherif, Muhammad Umair Hassan, Ali K Yetisen, Haider Butt
Low-cost, robust, and reusable continuous glucose monitoring systems that can provide quantitative measurements at point-of-care settings is an unmet medical need. Optical glucose sensors require complex and time-consuming fabrication process and their readouts are not practical for quantitative analyses. Here, a wearable contact lens optical sensor was created for the continuous quantification of glucose at physiological conditions, simplifying the fabrication process and facilitating smartphone readouts. A photonic microstructure having a periodicity of 1...
May 11, 2018: ACS Nano
https://www.readbyqxmd.com/read/29750114/profiling-the-propagation-of-error-from-ppg-to-hrv-features-in-a-wearable-physiological-monitoring-device
#14
Davide Morelli, Leonardo Bartoloni, Michele Colombo, David Plans, David A Clifton
Wearable physiological monitors are becoming increasingly commonplace in the consumer domain, but in literature there exists no substantive studies of their performance when measuring the physiology of ambulatory patients. In this Letter, the authors investigate the reliability of the heart-rate (HR) sensor in an exemplar 'wearable' wrist-worn monitoring system (the Microsoft Band 2 ); their experiments quantify the propagation of error from (i) the photoplethysmogram (PPG) acquired by pulse oximetry, to (ii) estimation of HR, and (iii) subsequent calculation of HR variability (HRV) features...
April 2018: Healthcare Technology Letters
https://www.readbyqxmd.com/read/29749708/freestanding-fiber-based-wearable-temperature-sensor-with-tunable-thermal-index-for-healthcare-monitoring
#15
Tran Quang Trung, Hoang Sinh Le, Thi My Linh Dang, Sanghyun Ju, Sang Yoon Park, Nae-Eung Lee
Fiber-based sensors integrated on textiles or clothing systems are required for the next generation of wearable electronic platforms. Fiber-based physical sensors are developed, but the development of fiber-based temperature sensors is still limited. Herein, a new approach to develop wearable temperature sensors that use freestanding single reduction graphene oxide (rGO) fiber is proposed. A freestanding and wearable temperature-responsive rGO fiber with tunable thermal index is obtained using simple wet spinning and a controlled graphene oxide reduction time...
May 11, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29748508/unifying-terrain-awareness-for-the-visually-impaired-through-real-time-semantic-segmentation
#16
Kailun Yang, Kaiwei Wang, Luis M Bergasa, Eduardo Romera, Weijian Hu, Dongming Sun, Junwei Sun, Ruiqi Cheng, Tianxue Chen, Elena López
Navigational assistance aims to help visually-impaired people to ambulate the environment safely and independently. This topic becomes challenging as it requires detecting a wide variety of scenes to provide higher level assistive awareness. Vision-based technologies with monocular detectors or depth sensors have sprung up within several years of research. These separate approaches have achieved remarkable results with relatively low processing time and have improved the mobility of impaired people to a large extent...
May 10, 2018: Sensors
https://www.readbyqxmd.com/read/29748505/textile-based-interdigital-capacitive-soft-strain-sensor-for-wearable-applications
#17
Ozgur Atalay
The electronic textile area has gained considerable attention due to its implementation of wearable devices, and soft sensors are the main components of these systems. In this paper, a new sensor design is presented to create stretchable, capacitance-based strain sensors for human motion tracking. This involves the use of stretchable, conductive-knit fabric within the silicone elastomer matrix, as interdigitated electrodes. While conductive fabric creates a secure conductive network for electrodes, a silicone-based matrix provides encapsulation and dimensional-stability to the structure...
May 10, 2018: Materials
https://www.readbyqxmd.com/read/29745788/3x3-basketball-performance-characteristics-and-changes-during-elite-tournament-competition
#18
Paul G Montgomery, Brendan D Maloney
PURPOSE: To determine the changes in game performance during tournament play of elite 3x3 basketball. METHODS: 361 males and 208 females competing in selected international tournaments had game demands assessed by wearable technology (GPS, inertial sensor, heart rate) along with post game blood lactate and perceived responses. Differences in the means for selected variables between games were compared using magnitude based inferences and reported with Effect Size and associated confidence limits, along with the percentage difference (ES; ±90%CL, %) of log-transformed data...
May 10, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29745552/-intelligent-watch-system-for-health-monitoring-based-on-bluetooth-low-energy-technology
#19
Ji Wang, Hailiang Guo, Xiaoli Ren
According to the development status of wearable technology and the demand of intelligent health monitoring, we studied the multi-function integrated smart watches solution and its key technology. First of all, the sensor technology with high integration density, Bluetooth low energy (BLE) and mobile communication technology were integrated and used in develop practice. Secondly, for the hardware design of the system in this paper, we chose the scheme with high integration density and cost-effective computer modules and chips...
August 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29745525/-quantitative-assessment-of-motor-function-in-patients-with-parkinson-s-disease-using-wearable-sensors
#20
Tianyu Shen, Jiping Wang, Liquan Guo, Qifan Bai, Huijun Zhang, Shouyan Wang, Daxi Xiong
Motor dysfunction is the main clinical symptom and diagnosis basis of patients with Parkinson's disease (PD). A total of 30 subjects were recruited in this study, including 15 PD patients (PD group) and 15 healthy subjects (control group). Then 5 wearable inertial sensor nodes were worn on the bilateral upper limbs, lower limbs and waist of subjects. When completing the 6 paradigm tasks, the acceleration and angular velocity signals from different parts of the body were acquired and analyzed to obtain 20 quantitative parameters which contain information about the amplitude, frequency, and fatigue degree of movements to assess the motor function...
April 1, 2018: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
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