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https://www.readbyqxmd.com/read/29244756/recent-progress-in-biosensors-for-environmental-monitoring-a-review
#1
REVIEW
Celine I L Justino, Armando C Duarte, Teresa A P Rocha-Santos
The environmental monitoring has been one of the priorities at the European and global scale due to the close relationship between the environmental pollution and the human health/socioeconomic development. In this field, the biosensors have been widely employed as cost-effective, fast, in situ, and real-time analytical techniques. The need of portable, rapid, and smart biosensing devices explains the recent development of biosensors with new transduction materials, obtained from nanotechnology, and for multiplexed pollutant detection, involving multidisciplinary experts...
December 15, 2017: Sensors
https://www.readbyqxmd.com/read/29235521/infrared-actuation-induced-simultaneous-reconfiguration-of-surface-color-and-morphology-for-soft-robotics
#2
Seyedali Banisadr, Jian Chen
Cephalopods, such as cuttlefish, demonstrate remarkable adaptability to the coloration and texture of their surroundings by modulating their skin color and surface morphology simultaneously, for the purpose of adaptive camouflage and signal communication. Inspired by this unique feature of cuttlefish skins, we present a general approach to remote-controlled, smart films that undergo simultaneous changes of surface color and morphology upon infrared (IR) actuation. The smart film has a reconfigurable laminated structure that comprises an IR-responsive nanocomposite actuator layer and a mechanochromic elastomeric photonic crystal layer...
December 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29235355/facile-fabrication-of-electrically-conductive-low-density-polyethylene-carbon-fiber-tubes-for-novel-smart-materials-via-multi-axial-orientation
#3
Yijun Li, Min Nie, Qi Wang
Electromechanical sensors are indispensable components in functional devices and robotics application. However, the fabrication of the sensors still maintain a challenging issue that high percolation threshold and easy failure of conductive network are derived from uniaxial orientation of conductive fillers in practical melt processing. Herein, we reported a facile fabrication method to prepare multi-axial low density polyethylene (LDPE) /carbon fibers (CFs) tube with bidirectional controllable electrical conductivity and sensitive strain-responsive performance via rotation extrusion technology...
December 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29233679/graphene-paper-supported-mos2-nanocrystals-monolayer-with-cu-submicron-buds-high-performance-flexible-platform-for-sensing-in-sweat
#4
Zhengyun Wang, Shuang Dong, Mengxi Gui, Muhammad Asif, Wei Wang, Feng Wang, Hongfang Liu
Flexible sweat biosensors are of considerable current interest for the development of wearable smart miniature devices. In this work, we report a novel type of flexible and electrochemical sweat platform fabricated by depositing Cu submicron buds on freestanding graphene paper (GP) carrying MoS2 nanocrystals monolayer for bio-functional detection of glucose and lactate. Quantitative analysis of glucose and lactate was carried out by using amperometric i-t method. Linear ranges were obtained between 5 and 1775 μM for glucose and 0...
December 9, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/29232846/home-camera-based-fall-detection-system-for-the-elderly
#5
Koldo de Miguel, Alberto Brunete, Miguel Hernando, Ernesto Gambao
Falls are the leading cause of injury and death in elderly individuals. Unfortunately, fall detectors are typically based on wearable devices, and the elderly often forget to wear them. In addition, fall detectors based on artificial vision are not yet available on the market. In this paper, we present a new low-cost fall detector for smart homes based on artificial vision algorithms. Our detector combines several algorithms (background subtraction, Kalman filtering and optical flow) as input to a machine learning algorithm with high detection accuracy...
December 9, 2017: Sensors
https://www.readbyqxmd.com/read/29230431/initial-experience-and-usage-patterns-with-the-owlet-smart-sock-monitor-in-47-495-newborns
#6
Michelle I Dangerfield, Kenneth Ward, Luke Davidson, Milena Adamian
We report the largest experience, to our knowledge, of home cardiorespiratory monitoring in 47,495 newborns using the novel Owlet Smart Sock (OSS) technology (October 2015 to May 2017). On average, 47,495 newborns were monitored for 6 months, 4.5 d/wk, 9.9 h/d. Continuous readings of oxygen saturation and heart rate were obtained from 39,626 full-term newborns. OSS users were likely first-time parents in their 30s with at least a college degree; 37% had a healthcare professional in the family; and 28% were at or below median income level per the US Census Bureau...
2017: Global Pediatric Health
https://www.readbyqxmd.com/read/29229853/designing-flexible-2d-transition-metal-carbides-with-strain-controllable-lithium-storage
#7
Hang Zhang, Zhongheng Fu, Ruifeng Zhang, Qianfan Zhang, Hongzhen Tian, Dominik Legut, Timothy C Germann, Yuanqi Guo, Shiyu Du, Joseph S Francisco
Efficient flexible energy storage systems have received tremendous attention due to their enormous potential applications in self-powering portable electronic devices, including roll-up displays, electronic paper, and "smart" garments outfitted with piezoelectric patches to harvest energy from body movement. Unfortunately, the further development of these technologies faces great challenges due to a lack of ideal electrode materials with the right electrochemical behavior and mechanical properties. MXenes, which exhibit outstanding mechanical properties, hydrophilic surfaces, and high conductivities, have been identified as promising electrode material candidates...
December 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29225497/swelling-induced-wrinkling-in-layered-gel-beams
#8
P Nardinocchi, E Puntel
Gels are widely employed in smart mechanical devices and biomedical applications. Swelling-induced bending actuation can be obtained by means of a simple bilayer gel beam. We show that this system can also exhibit wrinkling patterns of potential interest for structural morphing and sensing. We study swelling-induced wrinkling at the extrados of a bilayer gel beam with the softer layer on top. The bent configuration at finite strain is recovered first and, starting from it, a linear perturbation analysis is performed...
November 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/29216501/smart-coils-for-intracranial-aneurysm-embolization-initial-outcomes
#9
Adeel Ilyas, Thomas J Buell, Ching-Jen Chen, Dale Ding, Daniel M S Raper, Davis G Taylor, Jennifer D Sokolowski, Kenneth C Liu
OBJECTIVES: Endovascular technology for the treatment of intracranial aneurysms continues to rapidly evolve. The SMART coil (Penumbra Inc., Alameda, CA, USA) is a novel microcoil designed to enhance deliverability. The aim of this single-center, retrospective cohort study is to assess the initial outcomes after aneurysm embolization using SMART coils. PATIENTS AND METHODS: We reviewed consecutive patients with intracranial aneurysms who underwent endovascular embolization using SMART coils from June 2016 to January 2017...
December 2, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29205542/thermally-induced-bending-of-res2-nanowalls
#10
Qin Zhang, Wenjie Wang, Jiaqian Zhang, Xiaohui Zhu, Lei Fu
Among the variety of stimuli-responsive materials, temperature-responsive materials (TRMs) can adapt to the surrounding environment in the presence of a thermal stimulus, and they have attracted considerable attention in sensors, actuators, and surface engineering. However, polymers, as the most representative TRMs, are far from ideal with respect to long-term reliability and durability. Here, for the first time, an inorganic material, ReS2 , is analyzed, which possesses an unexpected temperature-responsive behavior that is triggered by stable and reversible thermally induced bending (TIB)...
December 4, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29204980/usefulness-and-radiological-evaluation-of-accuracy-of-innovative-smart-hand-technique-for-pedicle-screw-placement-an-anatomical-study
#11
Ayhan Comert, İhsan Dogan, Y Sukru Çaglar
AIM: The aim of this study is to use a smartphone application during pedicle screw placement navigation and examine the accuracy of this application on anatomical dry vertebrae model. MATERIAL AND METHODS: 76 dry vertebrae were used for this study and pedicle entry points, projections of pedicle screw trajectory lines in lateral and superior aspect of vertebral body were identified and drawn for each vertebra bilaterally. In each position, all angulations were measured directly before the procedure manually...
November 1, 2017: Turkish Neurosurgery
https://www.readbyqxmd.com/read/29204467/home-energy-management-hem-database-a-list-with-coded-attributes-of-308-devices-commercially-available-in-the-us
#12
Marco Pritoni, Rebecca Ford, Beth Karlin, Angela Sanguinetti
Policymakers worldwide are currently discussing whether to include home energy management (HEM) products in their portfolio of technologies to reduce carbon emissions and improve grid reliability. However, very little data is available about these products. Here we present the results of an extensive review including 308 HEM products available on the US market in 2015-2016. We gathered these data from publicly available sources such as vendor websites, online marketplaces and other vendor documents. A coding guide was developed iteratively during the data collection and utilized to classify the devices...
February 2018: Data in Brief
https://www.readbyqxmd.com/read/29204425/continuous-non-invasive-arterial-pressure-assessment-during-surgery-to-improve-outcome
#13
REVIEW
Alena Stenglova, Jan Benes
Blood pressure (BP) is one of the most important variables evaluated during almost every medical examination. Most national anesthesiology societies recommend BP monitoring at least once every 5 min in anesthetized subjects undergoing surgical procedures. In most cases, BP is monitored non-invasively using oscillometric cuffs. Although the risk of arterial cannulation is not very high, the invasive BP monitoring is usually indicated only in the case of high-risk patients or in complex surgical procedures...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/29203949/simultaneous-wireless-power-transfer-and-data-communication-using-synchronous-pulse-controlled-load-modulation
#14
Shitong Mao, Hao Wang, Chunbo Zhu, Zhi-Hong Mao, Mingui Sun
Wireless Power Transfer (WPT) and wireless data communication are both important problems of research with various applications, especially in medicine. However, these two problems are usually studied separately. In this work, we present a joint study of both problems. Most medical electronic devices, such as smart implants, must have both a power supply to allow continuous operation and a communication link to pass information. Traditionally, separate wireless channels for power transfer and communication are utilized, which complicate the system structure, increase power consumption and make device miniaturization difficult...
October 2017: Measurement: Journal of the International Measurement Confederation
https://www.readbyqxmd.com/read/29202033/synthetic-smart-gel-provides-glucose-responsive-insulin-delivery-in-diabetic-mice
#15
Akira Matsumoto, Miyako Tanaka, Hiroko Matsumoto, Kozue Ochi, Yuki Moro-Oka, Hirohito Kuwata, Hironori Yamada, Ibuki Shirakawa, Taiki Miyazawa, Hitoshi Ishii, Kazunori Kataoka, Yoshihiro Ogawa, Yuji Miyahara, Takayoshi Suganami
Although previous studies have attempted to create "electronics-free" insulin delivery systems using glucose oxidase and sugar-binding lectins as a glucose-sensing mechanism, no successful clinical translation has hitherto been made. These protein-based materials are intolerant of long-term use and storage because of their denaturing and/or cytotoxic properties. We provide a solution by designing a protein-free and totally synthetic material-based approach. Capitalizing on the sugar-responsive properties of boronic acid, we have established a synthetic polymer gel-based insulin delivery device confined within a single catheter, which exhibits an artificial pancreas-like function in vivo...
November 2017: Science Advances
https://www.readbyqxmd.com/read/29199986/a-low-cost-method-for-visible-fluorescence-imaging
#16
Crissy L Tarver, Marc Pusey
A wide variety of crystallization solutions are screened to establish conditions that promote the growth of a diffraction-quality crystal. Screening these conditions requires the assessment of many crystallization plates for the presence of crystals. Automated systems for screening and imaging are very expensive. A simple approach to imaging trace fluorescently labeled protein crystals in crystallization plates has been devised, and can be implemented at a cost as low as $50. The proteins β-lactoglobulin B, trypsin and purified concanavalin A (ConA) were trace fluorescently labeled using three different fluorescent probes: Cascade Yellow (CY), Carboxyrhodamine 6G (CR) and Pacific Blue (PB)...
December 1, 2017: Acta Crystallographica. Section F, Structural Biology Communications
https://www.readbyqxmd.com/read/29196713/a-hybrid-strain-and-thermal-energy-harvester-based-on-an-infra-red-sensitive-er3-modified-poly-vinylidene-fluoride-ferroelectret-structure
#17
Sujoy Kumar Ghosh, Mengying Xie, Christopher Rhys Bowen, Philip R Davies, David J Morgan, Dipankar Mandal
In this paper, a novel infra-red (IR) sensitive Er3+ modified poly(vinylidene fluoride) (PVDF) (Er-PVDF) film is developed for converting both mechanical and thermal energies into useful electrical power. The addition of Er3+ to PVDF is shown to improve piezoelectric properties due to the formation of a self-polarized ferroelectric β-phase and the creation of an electret-like porous structure. In addition, we demonstrate that Er3+ acts to enhance heat transfer into the Er-PVDF film due to its excellent infrared absorbance, which, leads to rapid and large temperature fluctuations and improved pyroelectric energy transformation...
December 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29194414/marked-object-recognition-multitouch-screen-printed-touchpad-for-interactive-applications
#18
Jivago Serrado Nunes, Nelson Castro, Sergio Gonçalves, Nélson Pereira, Vitor Correia, Senentxu Lanceros-Mendez
The market for interactive platforms is rapidly growing, and touchscreens have been incorporated in an increasing number of devices. Thus, the area of smart objects and devices is strongly increasing by adding interactive touch and multimedia content, leading to new uses and capabilities. In this work, a flexible screen printed sensor matrix is fabricated based on silver ink in a polyethylene terephthalate (PET) substrate. Diamond shaped capacitive electrodes coupled with conventional capacitive reading electronics enables fabrication of a highly functional capacitive touchpad, and also allows for the identification of marked objects...
December 1, 2017: Sensors
https://www.readbyqxmd.com/read/29192614/using-smart-devices-to-measure-intermittent-noise-in-the-workplace
#19
Benjamin Roberts, Richard Lee Neitzel
PURPOSE: To determine the accuracy of smart devices (iPods) to measure intermittent noise and integrate a noise dose in the workplace. MATERIALS AND METHODS: In experiment 1, four iPods were each paired with a Larson Davis Spark dosimeter and exposed to randomly fluctuating pink noise in a reverberant sound chamber. Descriptive statistics and the mean difference between the iPod and its paired dosimeter were calculated for the 1-s data logged measurements. The calculated time weighted average (TWA) was also compared between the devices...
March 2017: Noise & Health
https://www.readbyqxmd.com/read/29191005/construction-of-high-drug-loading-and-enzymatic-degradable-multilayer-films-for-self-defense-drug-release-and-long-term-biofilm-inhibition
#20
Bailiang Wang, Huihua Liu, Lin Sun, Yingying Jin, Xiaoxu Ding, Lingli Li, Jian Ji, Hao Chen
Bacterial infections and biofilm formation on the surface of implants is an important issue which greatly affect biomedical applications and even cause device failure. Construction of high drug loading systems on the surface and control the drug release on-demand is an efficient way to lower the development of resistant bacteria and biofilm formation. In the present study, (montmorillonite/hyaluronic acid-gentamicin)10 ((MMT/HA-GS)10) organic/inorganic hybrid multilayer films were alternately self-assembled on substrates...
November 30, 2017: Biomacromolecules
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