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https://www.readbyqxmd.com/read/28340528/znfe2o4-nanotapers-slag-assistant-growth-and-enhanced-photoelectrochemical-efficiency
#1
Xuefeng She, Zhuo Zhang
In this study, ZnFe2O4 (ZFO) nanotapers are fabricated on the ZnO nanorods (NRs) by recycling rare-earth oxide (REO) slag as the iron source, which thereby exhibits dramatically enhanced photoelectrochemical (PEC) efficiency. Our studies demonstrate that the electron-hole separation and charge migration can be facilitated by the cascade band alignment of ZFO and ZnO and the branched nanotaper structures. Not only the iron source, the slag particles can also act as the passivation layers, leading to improved electron lifetime and significant PEC enhancement...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28340435/optimization-of-hydrogen-dispersion-in-thermophilic-up-flow-reactors-for-ex-situ-biogas-upgrading
#2
Ilaria Bassani, Panagiotis G Kougias, Laura Treu, Hugo Porté, Stefano Campanaro, Irini Angelidaki
This study evaluates the efficiency of four novel up-flow reactors for ex situ biogas upgrading converting externally provided CO2 and H2 to CH4, via hydrogenotrophic methanogenesis. The gases were injected through stainless steel diffusers combined with alumina ceramic sponge or through alumina ceramic membranes. Pore size, input gas loading and gas recirculation flow rate were modulated to optimize gas-liquid mass transfer, and thus methanation efficiency. Results showed that larger pore size diffusion devices achieved the best kinetics and output-gas quality converting all the injected H2 and CO2, up to 3...
March 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28340293/functional-paper-based-platform-for-rapid-capture-and-detection-of-ceo2-nanoparticles
#3
Ali Othman, Daniel Andreescu, Dinusha P Karunaratne, Suryadevara V Babu, Silvana Andreescu
Development of systems for capture, sequestration and tracking of nanoparticles (NPs) is becoming a significant focus in many aspects of nanotechnology and environmental research. These systems enable a broad range of applications for evaluating concentration, distribution and effects of NPs for environmental, clinical, epidemiological and occupational exposure studies. Herein, we describe the first example of a ligand-graft multifunctional platform for capture and detection of cerium oxide (CeO2 or ceria) NPs...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28340242/insertion-of-miniaturized-cardiac-monitors-outside-the-catheter-operating-room-experience-and-practical-advice
#4
Jan Steffel, David Jay Wright, Harald Schäfer, Tabinda Rashid-Fadel, Thorsten Lewalter
Minor surgical procedures are increasingly being performed as outpatient procedures in settings outside hospital operating rooms (ORs). In electrophysiology, the recent miniaturization of insertable cardiac monitors (ICMs) has enabled the routine insertion of the device as a minimally invasive procedure without the need of a catheter OR. However, a shift to office-based environments for minor surgical procedures is associated with some concerns, particularly with respect to patient- and procedure-related safety in the new setting...
March 17, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28339800/the-dark-cloud-of-recreational-drugs-and-vaping
#5
M S Blundell, P I Dargan, D M Wood
Electronic cigarettes (e-cigarettes) are increasing in popularity with 19% of UK smokers reporting to have used them. The ability to regulate the evaporation temperature in newer electronic nicotine delivery systems (ENDS) facilitates the potential for use of these devices to 'vape' cannabis, novel psychoactive substances (NPS) and other recreational drugs. Vaping cannabis does have the potential to reduce tobacco use and combustible cannabis/tobacco-related disease, but with over one-third of UK adults reporting life-time use of recreational drugs and increasing e-cigarette uptake in adolescent groups the misuse of these devices poses a serious potential public health risk...
March 9, 2017: QJM: Monthly Journal of the Association of Physicians
https://www.readbyqxmd.com/read/28339192/a-novel-exposure-system-termed-navetta-for-in-vitro-laminar-flow-electrodeposition-of-nanoaerosol-and-evaluation-of-immune-effects-in-human-lung-reporter-cells
#6
Evelien Frijns, Sandra Verstraelen, Linda Corinna Stoehr, Jo van Laer, An Jacobs, Jan Peters, Kristof Tirez, Matthew Boyles, Mark Geppert, Pierre Madl, Inge Nelissen, Albert Duschl, Martin Himly
A new prototype air-liquid interface (ALI) exposure system, a flatbed aerosol exposure chamber termed NAVETTA, was developed to investigate deposition of engineered nanoparticles (NPs) on cultured human lung A549 cells directly from the gas phase. This device mimics human lung cell exposure to NPs due to a low horizontal gas flow combined with cells exposed at the ALI. Electrostatic field assistance is applied to improve NP deposition efficiency. As proof-of-principle, cell viability and immune responses after short-term exposure to nano-copper oxide (CuO)-aerosol were determined...
March 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28338144/selective-surface-tension-induced-patterning-on-flexible-textiles-via-click-chemistry
#7
Ben Wang, Yabin Zhang, Li Zhang
A solid surface commonly forms two wetting modes by alternating the type of the liquids, i.e. wetting and nonwetting. Here we report that a textile can be programmed to exhibit three wetting modes by simply alternating the surface tension of the liquids, they are in turn, wetting, selective wetting and nonwetting. The hidden patterns are prepared via a combination of wet chemical etching and two-step UV-induced thiol-ene click chemistry to graft low-surface-tension thiols and high-surface-tension thiols, respectively, on the textile surface...
March 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/28338130/the-aqueous-supramolecular-chemistry-of-cucurbit-n-urils-pillar-n-arenes-and-deep-cavity-cavitands
#8
REVIEW
James Murray, Kimoon Kim, Tomoki Ogoshi, Wei Yao, Bruce C Gibb
This tutorial review summarizes the continuing exploration of three prominent water-soluble hosts: cucurbiturils, pillar[n]arenes and deep-cavity cavitands. As we describe, these hosts are revealing how orchestrating the hydrophobic effect can lead to a broad range of properties and applications, from: nano-reactors, supramolecular polymers, stimuli-responsive biointerfaces, switches, and novel purification devices. We also describe how their study is also revealing more details about the properties of water and aqueous solutions...
March 24, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28338069/rram-based-parallel-computing-architecture-using-k-nearest-neighbor-classification-for-pattern-recognition
#9
Yuning Jiang, Jinfeng Kang, Xinan Wang
Resistive switching memory (RRAM) is considered as one of the most promising devices for parallel computing solutions that may overcome the von Neumann bottleneck of today's electronic systems. However, the existing RRAM-based parallel computing architectures suffer from practical problems such as device variations and extra computing circuits. In this work, we propose a novel parallel computing architecture for pattern recognition by implementing k-nearest neighbor classification on metal-oxide RRAM crossbar arrays...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28338048/reconfigurable-superconducting-vortex-pinning-potential-for-magnetic-disks-in-hybrid-structures
#10
Estefani Marchiori, Peter J Curran, Jangyong Kim, Nathan Satchell, Gavin Burnell, Simon J Bending
High resolution scanning Hall probe microscopy has been used to directly visualise the superconducting vortex behavior in hybrid structures consisting of a square array of micrometer-sized Py ferromagnetic disks covered by a superconducting Nb thin film. At remanence the disks exist in almost fully flux-closed magnetic vortex states, but the observed cloverleaf-like stray fields indicate the presence of weak in-plane anisotropy. Micromagnetic simulations suggest that the most likely origin is an unintentional shape anisotropy...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28338003/directional-phonon-suppression-function-as-a-tool-for-the-identification-of-ultralow-thermal-conductivity-materials
#11
Giuseppe Romano, Alexie M Kolpak
Boundary-engineering in nanostructures has the potential to dramatically impact the development of materials for high- efficiency conversion of thermal energy directly into electricity. In particular, nanostructuring of semiconductors can lead to strong suppression of heat transport with little degradation of electrical conductivity. Although this combination of material properties is promising for thermoelectric materials, it remains largely unexplored. In this work, we introduce a novel concept, the directional phonon suppression function, to unravel boundary-dominated heat transport in unprecedented detail...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28337981/field-emission-from-quantum-dot-in-perovskite-solids
#12
F Pelayo García de Arquer, Xiwen Gong, Randy P Sabatini, Min Liu, Gi-Hwan Kim, Brandon R Sutherland, Oleksandr Voznyy, Jixian Xu, Yuangjie Pang, Sjoerd Hoogland, David Sinton, Edward Sargent
Quantum dot and well architectures are attractive for infrared optoelectronics, and have led to the realization of compelling light sensors. However, they require well-defined passivated interfaces and rapid charge transport, and this has restricted their efficient implementation to costly vacuum-epitaxially grown semiconductors. Here we report solution-processed, sensitive infrared field-emission photodetectors. Using quantum-dots-in-perovskite, we demonstrate the extraction of photocarriers via field emission, followed by the recirculation of photogenerated carriers...
March 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/28337480/intra-channel-stent-release-technique-for-fluoroless-endoscopic-ultrasound-guided-lumen-apposing-metal-stent-placement-changing-the-paradigm
#13
Andrea Anderloni, Fabia Attili, Silvia Carrara, Domenico Galasso, Milena Di Leo, Guido Costamagna, Alessandro Repici, Rastislav Kunda, Alberto Larghi
Background Recently, a novel lumen-apposing fully covered self-expanding metal stent (LA-FCSEMS) mounted on an electrocautery-enhanced delivery system has been developed to perform endoscopic ultrasound (EUS)-guided transluminal drainage. From early experience, however, release of the proximal flange of the stent has mostly been done using endoscopic view guidance to ensure proper positioning. Aim We describe a new technique that we have named the Intra-Channel Stent Release Technique (ICSRT) to perform stent placement under complete EUS control, without the use of either fluoroscopic or endoscopic views...
January 2017: Endoscopy International Open
https://www.readbyqxmd.com/read/28336901/an-optical-sensor-with-polyaniline-gold-hybrid-nanostructures-for-monitoring-ph-in-saliva
#14
Chongdai Luo, Yangyang Wang, Xuemeng Li, Xueqin Jiang, Panpan Gao, Kang Sun, Jianhua Zhou, Zhiguang Zhang, Qing Jiang
Saliva contains important personal physiological information that is related to some diseases, and it is a valuable source of biochemical information that can be collected rapidly, frequently, and without stress. In this article, we reported a new and simple localized surface plasmon resonance (LSPR) substrate composed of polyaniline (PANI)-gold hybrid nanostructures as an optical sensor for monitoring the pH of saliva samples. The overall appearance and topography of the substrates, the composition, and the wettability of the LSPR surfaces were characterized by optical and scanning electron microscope (SEM) images, infrared spectra, and contact angles measurement, respectively...
March 17, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336845/parametrically-optimized-carbon-nanotube-coated-cold-cathode-spindt-arrays
#15
Xuesong Yuan, Matthew T Cole, Yu Zhang, Jianqiang Wu, William I Milne, Yang Yan
Here, we investigate, through parametrically optimized macroscale simulations, the field electron emission from arrays of carbon nanotube (CNT)-coated Spindts towards the development of an emerging class of novel vacuum electron devices. The present study builds on empirical data gleaned from our recent experimental findings on the room temperature electron emission from large area CNT electron sources. We determine the field emission current of the present microstructures directly using particle in cell (PIC) software and present a new CNT cold cathode array variant which has been geometrically optimized to provide maximal emission current density, with current densities of up to 11...
January 12, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336478/an-extended-protocol-for-usability-validation-of-medical-devices-research-design-and-reference-model
#16
Martin Schmettow, Raphaela Schnittker, Jan Maarten Schraagen
This paper proposes and demonstrates an extended protocol for usability validation testing of medical devices. A review of currently used methods for the usability evaluation of medical devices revealed two main shortcomings. Firstly, the lack of methods to closely trace the interaction sequences and derive performance measures. Secondly, a prevailing focus on cross-sectional validation studies, ignoring the issues of learnability and training. The U.S. Federal Drug and Food Administration's recent proposal for a validation testing protocol for medical devices is then extended to address these shortcomings: (1) a novel process measure 'normative path deviations' is introduced that is useful for both quantitative and qualitative usability studies and (2) a longitudinal, completely within-subject study design is presented that assesses learnability, training effects and allows analysis of diversity of users...
March 21, 2017: Journal of Biomedical Informatics
https://www.readbyqxmd.com/read/28335899/percutaneous-plug-based-arteriotomy-closure-device-for-large-bore-access-a-multicenter-prospective-study
#17
Nicolas M Van Mieghem, Azeem Latib, Jan van der Heyden, Lennart van Gils, Joost Daemen, Todd Sorzano, Jurgen Ligthart, Karin Witberg, Thom de Kroon, Nathaniel Maor, Antonio Mangieri, Matteo Montorfano, Peter P de Jaegere, Antonio Colombo, Gary Roubin
OBJECTIVES: The authors sought to study the safety and efficacy of the MANTA Vascular Closure Device (VCD), a novel collagen-based technology dedicated to closure of large-bore arteriotomies. BACKGROUND: Novel transfemoral therapeutic interventions requiring large-bore catheters have become valid minimally invasive options but have inherent access management challenges. To date, no dedicated vascular closure devices exist for large arteriotomies. METHODS: A prospective, single-arm clinical investigation enrolling patients who underwent elective percutaneous interventions with large-bore catheters and planned percutaneous arteriotomy closure in 3 European institutions...
March 27, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28335596/fast-fabrication-of-stable-perovskite-solar-cell-with-an-ultrathin-effective-novel-inorganic-hole-transport-layer
#18
Aibin Huang, Lei Lei, Jingting Zhu, Yu Yu, Yan Liu, Songwang Yang, Shanhu Bao, Xun Cao, Ping Jin
Aiming at fabricating simple, reproducible and scalable perovskite solar cells (PSCs) with least time consuming, novel CoOx hole transport layer (HTL) was first proposed and introduced in this work. The CoOx HTL thickness was minimized to about 10 nm with complete coverage on FTO substrate (F doped SnO2) by DC magnetron sputtering. The compact ultrathin HTL could minimize the incident light loss caused by cobalt ion absorption and reduce the carrier transport loss by shortening the transport path. Copper ion doping was employed to address the low conductivity of CoOx film and the energy level mismatch between CoOx and perovskite material...
March 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28335568/an-electricity-price-aware-open-source-smart-socket-for-the-internet-of-energy
#19
Óscar Blanco-Novoa, Tiago M Fernández-Caramés, Paula Fraga-Lamas, Luis Castedo
The Internet of Energy (IoE) represents a novel paradigm where electrical power systems work cooperatively with smart devices to increase the visibility of energy consumption and create safer, cleaner and sustainable energy systems. The implementation of IoE services involves the use of multiple components, like embedded systems, power electronics or sensors, which are an essential part of the infrastructure dedicated to the generation and distribution energy and the one required by the final consumer. This article focuses on the latter and presents a smart socket system that collects the information about energy price and makes use of sensors and actuators to optimize home energy consumption according to the user preferences...
March 21, 2017: Sensors
https://www.readbyqxmd.com/read/28335471/mobile-phonocardiogram-diagnosis-in-newborns-using-support-vector-machine
#20
Amir Mohammad Amiri, Mohammadreza Abtahi, Nick Constant, Kunal Mankodiya
Phonocardiogram (PCG) monitoring on newborns is one of the most important and challenging tasks in the heart assessment in the early ages of life. In this paper, we present a novel approach for cardiac monitoring applied in PCG data. This basic system coupled with denoising, segmentation, cardiac cycle selection and classification of heart sound can be used widely for a large number of the data. This paper describes the problems and additional advantages of the PCG method including the possibility of recording heart sound at home, removing unwanted noises and data reduction on a mobile device, and an intelligent system to diagnose heart diseases on the cloud server...
March 18, 2017: Healthcare (Basel, Switzerland)
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