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https://www.readbyqxmd.com/read/28822314/a-portable-smart-phone-device-for-rapid-and-sensitive-detection-of-e-coli-o157-h7-in-yoghurt-and-egg
#1
Mohamed Maarouf Ali Zeinhom, Yijia Wang, Yang Song, Mei-Jun Zhu, Yuehe Lin, Dan Du
The detection of E. coli O157:H7 in foods has held the attention of many researchers because of the seriousness attributed to this pathogen. In this study, we present a simple, sensitive, rapid and portable smartphone based fluorescence device for E. coli O157:H7 detection. This field-portable fluorescent imager on the smartphone involves a compact laser-diode-based photosource, a long-pass (LP) thin-film interference filter and a high-quality insert lenses. The design of the device provided a low noise to background imaging system...
August 4, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28816805/development-of-a-mobile-app-for-family-planning-providers
#2
Viannella Halsall, Jennifer Rogers, Jacki Witt, Sejun Song, Hoang Duc Huy Nguyen, Patricia Kelly
PURPOSE: To provide an overview of lessons learned during the development process of an app for iOS and Android based on national recommendations for providing quality family planning services. STUDY AND DESIGN: After a review of existing apps was conducted to determine whether an app of clinical recommendations for family planning existed, a team of clinicians, training specialists, and app developers created a resource app by first drafting a comprehensive content map...
September 2017: MCN. the American Journal of Maternal Child Nursing
https://www.readbyqxmd.com/read/28816431/carbon-nanotubes-arranged-as-smart-interfaces-in-lipid-langmuir-blodgett-films-enhancing-the-enzymatic-properties-of-penicillinase-for-biosensing-applications
#3
Fabio Scholl, Paulo Morais, Rayla Gabriel, Michael J Schöning, Jose Roberto Siqueira, Luciano Caseli
In this paper, carbon nanotubes (CNTs) were incorporated in penicillinase-phospholipid Langmuir and Langmuir-Blodgett (LB) films to enhance the enzyme catalytic properties. Adsorption of the penicillinase and CNTs at dimyristoylphosphatidic acid (DMPA) monolayers at the air-water interface was investigated by surface pressure-area isotherms, vibrational spectroscopy and Brewster angle microscopy. The floating monolayers were transferred to solid supports through the LB technique, forming mixed DMPA-CNTs-PEN films, which were investigated by quartz crystal microbalance, vibrational spectroscopy, and atomic force microscopy...
August 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812989/small-smart-fast-and-cheap-microchip-based-sensors-to-estimate-air-pollution-exposures-in-rural-households
#4
Ajay Pillarisetti, Tracy Allen, Ilse Ruiz-Mercado, Rufus Edwards, Zohir Chowdhury, Charity Garland, L Drew Hill, Michael Johnson, Charles D Litton, Nicholas L Lam, David Pennise, Kirk R Smith
Over the last 20 years, the Kirk R. Smith research group at the University of California Berkeley-in collaboration with Electronically Monitored Ecosystems, Berkeley Air Monitoring Group, and other academic institutions-has developed a suite of relatively inexpensive, rugged, battery-operated, microchip-based devices to quantify parameters related to household air pollution. These devices include two generations of particle monitors; data-logging temperature sensors to assess time of use of household energy devices; a time-activity monitoring system using ultrasound; and a CO₂-based tracer-decay system to assess ventilation rates...
August 16, 2017: Sensors
https://www.readbyqxmd.com/read/28812354/3d-moldable-nanofiber-reinforced-transparent-composites-with-hierarchically-self-assembled-reverse-nacre-like-architecture
#5
Subir Kumar Biswas, Hironari Sano, Md Iftekhar Shams, Hiroyuki Yano
Achieving structural hierarchy and a uniform nanofiller dispersion simultaneously remains highly challenging for obtaining a robust polymer nanocomposite of immiscible components. In this study, a remarkably facile Pickering emulsification approach is developed to fabricate hierarchical composites of immiscible acrylic polymer and native cellulose nanofibers by taking advantage of the dual role of the nanofibers as both the emulsion stabilizer and polymer reinforcement. The composites feature a unique "reverse" nacre-like microstructure reinforced with well-dispersed two-tier hierarchical nanofiber network, leading to a synergistic high strength, modulus, and toughness (20, 50, and 53 times that of neat polymer, respectively), high optical transparency (89%), high flexibility and a drastically low thermal expansion (13 ppm/K, 1/15th of the neat polymer)...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28809655/assistive-technology-addressing-safety-issues-in-dementia-a-scoping-review
#6
Mireille Gagnon-Roy, Annick Bourget, Stéphanie Stocco, Annie-Claude Lemieux Courchesne, Nicolas Kuhne, Véronique Provencher
Safety is an issue for older adults with dementia because they are at risk for various incidents. Intelligent assistive technology (IAT) may mitigate risks while promoting independence and reducing the impact on the caregiver of supporting a relative with dementia. The aim of this scoping review was to describe IATs and to identify factors to consider when selecting one. A systematic search was performed of the scientific and gray literature published between 2000 and 2015. A total of 31 sources were included...
September 2017: American Journal of Occupational Therapy: Official Publication of the American Occupational Therapy Association
https://www.readbyqxmd.com/read/28809104/large-scale-multifunctional-electrochromic-energy-storage-device-based-on-tungsten-trioxide-monohydrate-nanosheets-and-prussian-white
#7
Zhijie Bi, Xiaomin Li, Yongbo Chen, Xiaoli He, Xiaoke Xu, Xiang Dong Gao
A high-performance electrochromic-energy storage device (EESD) is developed, which successfully realizes the multifunctional combination of electrochromism and energy storage by constructing tungsten trioxide monohydrate (WO3●H2O) nanosheets and Prussian white (PW) film as asymmetric electrodes. The EESD presents excellent electrochromic properties of broad optical modulation (61.7%), ultrafast response speed (1.84/1.95 s) and great coloration efficiency (139.4 cm(2) C(-1)). In particular, remarkable cyclic stability (sustaining 82...
August 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28809085/electric-and-mechanical-switching-of-ferroelectric-and-resistive-states-in-semiconducting-batio3-%C3%AE-films-on-silicon
#8
Andrés Gómez, José Manuel Vila-Fungueiriño, Rahma Moalla, Guillaume Saint-Girons, Jaume Gázquez, María Varela, Romain Bachelet, Martí Gich, Francisco Rivadulla, Adrián Carretero-Genevrier
Materials that can couple electrical and mechanical properties constitute a key element of smart actuators, energy harvesters, or many sensing devices. Within this class, functional oxides display specific mesoscale responses which often result in great sensitivity to small external stimuli. Here, a novel combination of molecular beam epitaxy and a water-based chemical-solution method is used for the design of mechanically controlled multilevel device integrated on silicon. In particular, the possibility of adding extra functionalities to a ferroelectric oxide heterostructure by n-doping and nanostructuring a BaTiO3 thin film on Si(001) is explored...
August 15, 2017: Small
https://www.readbyqxmd.com/read/28805692/real-time-rain-rate-evaluation-via-satellite-downlink-signal-attenuation-measurement
#9
Filippo Giannetti, Ruggero Reggiannini, Marco Moretti, Elisa Adirosi, Luca Baldini, Luca Facheris, Andrea Antonini, Samantha Melani, Giacomo Bacci, Antonio Petrolino, Attilio Vaccaro
We present the NEFOCAST project (named by the contraction of "Nefele", which is the Italian spelling for the mythological cloud nymph Nephele, and "forecast"), funded by the Tuscany Region, about the feasibility of a system for the detection and monitoring of precipitation fields over the regional territory based on the use of a widespread network of new-generation Eutelsat "SmartLNB" (smart low-noise block converter) domestic terminals. Though primarily intended for interactive satellite services, these devices can also be used as weather sensors, as they have the capability of measuring the rain-induced attenuation incurred by the downlink signal and relaying it on an auxiliary return channel...
August 12, 2017: Sensors
https://www.readbyqxmd.com/read/28800508/a-suspending-droplet-mode-paper-based-microfluidic-platform-for-low-cost-rapid-and-convenient-detection-of-lead-ii-ions-in-liquid-solution
#10
Han Sun, Wanbo Li, Zhen-Zhen Dong, Chong Hu, Chung-Hang Leung, Dik-Lung Ma, Kangning Ren
A paper-based microfluidic device based on unconventional principle was developed and used to detect lead ions through a two-step process including heated incubation and subsequent mixing. The device was made by generating a superhydrophobic pattern, which defines channel and reservoir barriers, on a water-impermeable paper substrate, followed by loading and drying the reagents in the defined reservoirs. Different from the conventional paper-based devices that are made of water-permeable paper, the as-prepared device holds water drops in discrete reservoirs, and the water drops will not move unless the device is titled along the direction of the predefined channels...
August 1, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28800221/graphene-paper-pressure-sensor-for-detecting-human-motions
#11
Lu-Qi Tao, Kun-Ning Zhang, He Tian, Ying Liu, Dan-Yang Wang, Yuan-Quan Chen, Yi Yang, Tian-Ling Ren
The pressure sensors should have an excellent sensitivity in the range of 0-20kPa when applied in wearable applications. Traditional pressure sensors can't achieve both a high sensitivity and a large working range simultaneously, which results to their limited applications in wearable fields. There is an urgent need to develop a pressure sensor to make a breakthrough in both sensitivity and working range. In this paper, a graphene-paper pressure sensor which shows excellent performance in the range of 0-20kPa is proposed...
August 11, 2017: ACS Nano
https://www.readbyqxmd.com/read/28799525/fast-light-induced-reversible-wettability-of-zinc-oxide-nanorod-array-coated-with-gold-thin-layer
#12
Yuefan Wei, Hejun Du, Junhua Kong, Van Thai Tran, Jia Kai Koh, Chenyang Zhao, Chaobin He
Zinc oxide (ZnO) has gained much attention nowadays due to its excellent physical and chemical properties, and been extensively studied in energy harvesting applications, such as photovoltaic and piezoelectric devices. In recent years, its reversible wettability has also been attracting increasing interests. The wettability of ZnO nanostructures with various morphologies was studied. However, to our best knowledge, there is still a lack of investigations on further modifications on ZnO to provide more benefits outweighed to pristine ZnO...
August 11, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28796753/comparative-study-of-radon-concentration-with-two-techniques-and-elemental-analysis-in-drinking-water-samples-of-the-jammu-district-jammu-and-kashmir-india
#13
Ajay Kumar, Manpreet Kaur, Rohit Mehra, Dinesh Kumar Sharma, Rosaline Mishra
The level of radon concentration has been assessed using the Advanced SMART RnDuo technique in 30 drinking water samples from Jammu district, Jammu and Kashmir, India. The water samples were collected from wells, hand pumps, submersible pumps, and stored waters. The randomly obtained 14 values of radon concentration in water sources using the SMART RnDuo technique have been compared and cross checked by a RAD7 device. A good positive correlation (R = 0.88) has been observed between the two techniques. The overall value of radon concentration in various water sources has ranged from 2...
August 7, 2017: Health Physics
https://www.readbyqxmd.com/read/28795753/single-wearable-sensing-energy-device-based-on-photoelectric-biofuel-cells-for-simultaneous-analysis-of-perspiration-and-illuminance
#14
You Yu, Junfeng Zhai, Yong Xia, Shaojun Dong
Wearable electronics are essential for the construction of epidermal energy supply and portable healthcare devices. Herein, a self-powered wearable electronic device based on a photoelectric biofuel cell has been introduced for the first time to simultaneously detect the perspiration lactate and monitor the ambient illuminance depending on independent parameters. The functions of harvesting energy, detection of body function and monitoring of ambient have been merged into a single wireless sensor. This novel design may provide a wide range of smart and exciting wearable electronics...
August 10, 2017: Nanoscale
https://www.readbyqxmd.com/read/28782029/eye-motion-triggered-self-powered-mechnosensational-communication-system-using-triboelectric-nanogenerator
#15
Xianjie Pu, Hengyu Guo, Jie Chen, Xue Wang, Yi Xi, Chenguo Hu, Zhong Lin Wang
Mechnosensational human-machine interfaces (HMIs) can greatly extend communication channels between human and external devices in a natural way. The mechnosensational HMIs based on biopotential signals have been developing slowly owing to the low signal-to-noise ratio and poor stability. In eye motions, the corneal-retinal potential caused by hyperpolarization and depolarization is very weak. However, the mechanical micromotion of the skin around the corners of eyes has never been considered as a good trigger signal source...
July 2017: Science Advances
https://www.readbyqxmd.com/read/28777010/information-and-communicative-technology-use-enhances-psychological-well-being-of-older-adults-the-roles-of-age-social-connectedness-and-frailty-status
#16
Yang Fang, Anson K C Chau, Anna Wong, Helene H Fung, Jean Woo
OBJECTIVES: Information and communicative technology (ICT) use is a potential vehicle for improving the psychological well-being (PWB) of older people. We examined the roles of age, frailty, and social connectedness in the relationship between ICT use and PWB. METHOD: Telephone interviews were conducted in mid-2016 with 1201 participants aged 50 and above (55.7% female) residing in Hong Kong, China. The participants reported PWB, ICT use (frequency of using the Internet and smart devices), frailty status, contact with family, friends, and neighbors, self-rated health, subjective financial sufficiency, education level, and employment status...
August 4, 2017: Aging & Mental Health
https://www.readbyqxmd.com/read/28774521/a-comparison-of-undergraduate-clinical-ophthalmology-learning-methods-smart-phone-television-display-versus-slit-lamp-teaching-telescope
#17
Sandy Zhou Wenting, Margaret Million Samin, Srinivasan Sanjay, Kumari Neelam, Khalil Shibli, Su Chang, Jason Cheng
OBJECTIVE: To compare medical students' preference of smart phone television display (SPTD) to a slit-lamp teaching telescope (SLTT) in undergraduate clinical ophthalmology education. METHODS: This is a randomized, crossover, comparative study. Pairs of medical students were randomly assigned to 2 teaching sessions using either SPTD first followed by SLTT or in reverse order. Students were asked to give feedback on the 2 teaching devices by answering 6 questions using a numeric rating score from 1 to 10...
August 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/28774135/nano-inclusions-applied-in-cement-matrix-composites-a-review
#18
REVIEW
Guillermo Bastos, Faustino Patiño-Barbeito, Faustino Patiño-Cambeiro, Julia Armesto
Research on cement-based materials is trying to exploit the synergies that nanomaterials can provide. This paper describes the findings reported in the last decade on the improvement of these materials regarding, on the one hand, their mechanical performance and, on the other hand, the new properties they provide. These features are mainly based on the electrical and chemical characteristics of nanomaterials, thus allowing cement-based elements to acquire "smart" functions. In this paper, we provide a quantitative approach to the reinforcements achieved to date...
December 16, 2016: Materials
https://www.readbyqxmd.com/read/28773914/the-effect-of-4-octyldecyloxybenzoic-acid-on-liquid-crystalline-polyurethane-composites-with-triple-shape-memory-and-self-healing-properties
#19
Jianfeng Ban, Linjiang Zhu, Shaojun Chen, Yiping Wang
To better understand shape memory materials and self-healing materials, a new series of liquid-crystalline shape memory polyurethane (LC-SMPU) composites, named SMPU-OOBAm, were successfully prepared by incorporating 4-octyldecyloxybenzoic acid (OOBA) into the PEG-based SMPU. The effect of OOBA on the structure, morphology, and properties of the material has been carefully investigated. The results demonstrate that SMPU-OOBAm has liquid crystalline properties, triple-shape memory properties, and self-healing properties...
September 21, 2016: Materials
https://www.readbyqxmd.com/read/28772571/vibration-assisted-femtosecond-laser-drilling-with-controllable-taper-angles-for-amoled-fine-metal-mask-fabrication
#20
Wonsuk Choi, Hoon Young Kim, Jin Woo Jeon, Won Seok Chang, Sung-Hak Cho
This study investigates the effect of focal plane variation using vibration in a femtosecond laser hole drilling process on Invar alloy fabrication quality for the production of fine metal masks (FMMs). FMMs are used in the red, green, blue (RGB) evaporation process in Active Matrix Organic Light-Emitting Diode (AMOLED) manufacturing. The taper angle of the hole is adjusted by attaching the objective lens to a micro-vibrator and continuously changing the focal plane position. Eight laser pulses were used to examine how the hole characteristics vary with the first focal plane's position, where the first pulse is focused at an initial position and the focal planes of subsequent pulses move downward...
February 21, 2017: Materials
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