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Jun Liu, Tao Wang, Chuandong Dou, Lixiang Wang
Organoboron chemistry is a new tool to tune the electronic structures and properties of conjugated polymers, which are important for applications in organic opto-electronic devices. To investigate the effects of substituents of boron atoms on conjugated polymers, we synthesized three conjugated polymers based on double B←N bridged bipyridine (BNBP) with various substituents on the boron atoms. By changing the substituents from four phenyl groups and two phenyl groups/two fluorine atoms to four fluorine atoms, the BNBP-based polymers show the blue-shifted absorption spectra, decreased LUMO/HOMO energy levels and enhanced electron affinities, as well as the increased electron mobilities...
June 15, 2018: Chemistry: a European Journal
Federica Lucivero, Karin R Jongsma
Mobile health (mHealth) is rapidly being implemented and changing our ways of doing, understanding and organising healthcare. mHealth includes wearable devices as well as apps that track fitness, offer wellness programmes or provide tools to manage chronic conditions. According to industry and policy makers, these systems offer efficient and cost-effective solutions for disease prevention and self-management. While this development raises many ethically relevant questions, so far mHealth has received only little attention in medical ethics...
June 15, 2018: Journal of Medical Ethics
Ada Ng, Madhu Reddy, Alyson K Zalta, Stephen M Schueller
BACKGROUND: The increase in availability of patient data through consumer health wearable devices and mobile phone sensors provides opportunities for mental health treatment beyond traditional self-report measurements. Previous studies have suggested that wearables can be effectively used to benefit the physical health of people with mental health issues, but little research has explored the integration of wearable devices into mental health care. As such, early research is still necessary to address factors that might impact integration including patients' motivations to use wearables and their subsequent data...
June 15, 2018: JMIR Mental Health
Firas Chakroun, Vera Colombo, Dave Lie Sam Foek, Luigi Maria Gallo, Albert Feilzer, Mutlu Özcan
PURPOSE: The objective of this study was to evaluate the anterior tooth movement without and with bonded fixed orthodontic retainers under incremental loading conditions. MATERIALS AND METHODS: Six extracted mandibular anterior human teeth were embedded in acrylic resin in True Form I Arch type and 3D reconstruction of Digital Volume Tomography (DVT) images (0.4 mm3 voxels) were obtained. The anatomy of each tooth was segmented and digitally reconstructed using 3D visualization software for medical images (AMIRA, FEI SVG)...
June 6, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Amy Nb Johnston, Matthew J Barton, Grant A Williams-Pritchard, Michael Todorovic
Undergraduate nursing programs typically include students with limited 'on-campus' time who need learning resources that are flexible, technologically appropriate, remotely-accessible (mobile smart devices), and above all, engaging. This has presented academics with challenges surrounding institutional security firewalls, password-access requirements, intellectual property/ownership and staff/student privacy. To overcome these challenges a collection of evidence-based YouTube videos, posted on the Biological Sciences YouTube Channel, supported by the Biosciences in Nurse Education, and underpinned by Benner's pedagogical framework, were developed with the intention of moving students from novice to competent clinical bioscience users...
June 9, 2018: Nurse Education in Practice
Yingchang Jiang, Zeyi Wu, Le Jiang, Zhichang Pan, Peiyu Yang, Wenchao Tian, Linfeng Hu
The integration of high flexibility, high energy density and wide voltage window for solid-state supercapacitors remains a big challenge to date. Herein, ultrathin CoSeO3·H2O nanoribbons (thickness: ∼14 nm) with typical pseudocapacitive behavior were synthesized in a high yield by a solution-based refluxing process. Freestanding CoSeO3·H2O ribbon/hydroxylated multi-walled carbon nanotube (HWCNT) paper could be fabricated through a vacuum-assisted filtration strategy owing to its ultrathin nature, ribbon-like morphology and inherent flexibility...
June 15, 2018: Nanoscale
Ao Liu, Huihui Zhu, Huabin Sun, Yong Xu, Yong-Young Noh
The electronic functionalities of metal oxides comprise conductors, semiconductors, and insulators. Metal oxides have attracted great interest for construction of large-area electronics, particularly thin-film transistors (TFTs), for their high optical transparency, excellent chemical and thermal stability, and mechanical tolerance. High-permittivity (κ) oxide dielectrics are a key component for achieving low-voltage and high-performance TFTs. With the expanding integration of complementary metal oxide semiconductor transistors, the replacement of SiO2 with high-κ oxide dielectrics has become urgently required, because their provided thicker layers suppress quantum mechanical tunneling...
June 14, 2018: Advanced Materials
Megan A Catterton, Austin F Dunn, Rebecca R Pompano
Many in vivo tissue responses begin locally, yet most in vitro stimuli are delivered globally. Microfluidics has a unique ability to provide focal stimulation to tissue samples with precise control over fluid location, flow rate, and composition. However, previous devices utilizing fixed ports beneath the tissue required manual alignment of the tissue over the ports, increasing the risk of mechanical damage. Here we present a novel microfluidic device that allows the user to define the location of fluid delivery to a living tissue slice without manipulating the tissue itself...
June 15, 2018: Lab on a Chip
Margaret Smith, Miriam Segura-Totten, Kelly West
The impact of the Internet on education has been recognized for decades, and as technology advances, the ways in which students can access Internet content is ever increasing. Most students have some kind of portable smart device with which they access Internet content without the locational constraints of a desktop computer. This mobility has prompted abundant literature suggesting ways that Quick Response Codes (QR codes), a kind of two dimensional barcode, could be used to advance student learning. However, very few studies have tested the usefulness of QR codes in undergraduate science classes...
2018: Journal of Microbiology & Biology Education: JMBE
Deyang Ji, Tao Li, Ye Zou, Ming Chu, Ke Zhou, Jinyu Liu, Guofeng Tian, Zhaoyang Zhang, Xu Zhang, Liqiang Li, Dezhen Wu, Huanli Dong, Qian Miao, Harald Fuchs, Wenping Hu
The ever-increasing demand for flexible electronics calls for the development of low-voltage and high-mobility organic thin-film transistors (OTFTs) that can be integrated into emerging display and labeling technologies. Polymer dielectrics with comprehensive and balanced dielectric properties (i.e., a good balance between their insulating characteristics and compatibility with organic semiconductors) are considered particularly important for this end. Here, we introduce a simple but highly efficient strategy to realize this target by using a new type of copolymer as dielectrics...
June 14, 2018: Nature Communications
Michael Pascoe, Forrest Monroe, Helen Macfarlane
BACKGROUND: Wiki platform use has potential to improve student learning by improving engagement with course material. A student-created wiki was established to serve as a repository of study tools for students in a medical school curriculum. There is a scarcity of information describing student-led creation of wikis in medical education. OBJECTIVE: The aim is to characterize website traffic of a student-created wiki and evaluate student perceptions of usage via a short anonymous online survey...
June 14, 2018: JMIR Medical Education
John Jankovic, Tracy L Zontek, Megan Moore, Burton R Ogle, Scott Hollenbeck
BACKGROUND: Due to the lack of standard industrial hygiene sampling protocols for collection of nano-scale materials, sampling inlet device selection is left to individual researchers and professionals. OBJECTIVE: The objective of this study was to compare nano-scale aspiration efficiency for common inlet configurations with that of an open-ended sampler tube that is a commonly used inlet for direct reading instruments such as a condensation particle counter. METHODS: A polydisperse aerosol was generated using an electric motor as the aerosol source...
June 14, 2018: International Journal of Occupational and Environmental Health
Yashovardhan Agarwal
BACKGROUND: The World Health Organization and the World Bank's "World Report on Disability" reported that over 1 billion people have various kinds of disability worldwide while Indian Census 2011 reported about 26 million in India. The United Nations Convention states, "The Rights of Persons with Disabilities (PwD) include accessibility to Information, Transportation, Environment, Communication Technology and Services". OBJECTIVE: This article takes forward the reason of making the "EasenAccess" (EnA) Android-based app to empower PwD with wheelchair-accessibility information, communication sentences and sending SOS signals with location...
June 14, 2018: Disability and Rehabilitation. Assistive Technology
Mihirsinh Chauhan, Abhishek Sharma, Jessica Patel, M Aatif, Suresh Chand, Manoj Kumar Pandey, Manoj Kumar, J P Tiwari, Brijesh Tripathi
A key challenge for researchers in the field of organic solar cells (OSCs) is to develop a physical model for a device that correctly describes the charge carrier transport phenomenon. In this article, an analytical study on the charge carrier transport phenomenon in an OSC is reported, which expresses a balance between free charge carrier generation and recombination in low mobility PTB7:PC71BM blend layers. First, the current density-voltage (J-V) data for the fabricated OSC were extracted from experiments by varying the incident power light intensity (IPL) and then analysis through theoretical simulation was used to quantify the dominant interface recombination parameters limiting the device's performance...
June 14, 2018: Physical Chemistry Chemical Physics: PCCP
Q H Tan, Qianjin Wang, Yingkai Liu, Chunsheng Liu, Xiaobo Feng, Dapeng Yu
Graphene is one of the most promising spintronic materials due to its high carrier mobility. However, the absence of a band gap and ferromagnetic order in graphene seriously limit its applications in spintronics. How to utilize its high carrier mobility as well as mediate its electronic structure remains a challenge. Herein, we design a novel composite, which is composed of graphene and Mn-doped monolayer MoS2. The magnetic properties and electronic structures of graphene/Mn-doped monolayer MoS2 heterostructures were studied by using density functional theory (DFT) with the van der Waals (vdW) correlations (DFT-D)...
June 14, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Elena Bozzola, Giulia Spina, Margherita Ruggiero, Luigi Memo, Rino Agostiniani, Mauro Bozzola, Giovanni Corsello, Alberto Villani
BACKGROUND: Young children are too often exposed to mobile devices (MD) and most of them had their own device. The adverse effects of a early and prolonged exposure to digital technology on pre-school children has been described by several studies. Aim of the study is to analyze the consequences of MD exposure in pre-school children. METHODS: We analyzed the documented effects of media exposure on children's mental and physical health. RESULTS: According to recent studies, MD may interfere with learning, children development, well being, sleep, sight, listening, caregiver-child relationship...
June 14, 2018: Italian Journal of Pediatrics
Jin Yue, Abhinav Prakash, Matthew C Robbins, Steven J Koester, Bharat Jalan
The high room-temperature mobility that can be achieved in BaSnO3 has created significant excitement for its use as channel material in all-perovskite-based transistor devices such as ferroelectric field effect transistor (FET). Here, we report on the first demonstration of n-type depletion-mode FET using hybrid molecular beam epitaxy grown La-doped BaSnO3 as a channel material. The devices utilize a heterostructure metal-oxide semiconductor FET (MOSFET) design that includes an epitaxial SrTiO3 barrier layer capped with a thin layer of HfO2 used as a gate dielectric...
June 13, 2018: ACS Applied Materials & Interfaces
Yuchen Yue, Jiancui Chen, Yu Zhang, Shuaishuai Ding, Fulai Zhao, Yu Wang, Daihua Zhang, Rongjin Li, Huanli Dong, Wenping Hu, Yiyu Feng, Wei Feng
A large-area uniform of single-crystal disulfide (WS2) is important for advanced optoelectronics based on two-dimensional (2D) atomic crystals. However, difficulies in controlling the interrelated growth parameters restrict its development in devices. Herein, we present the synthesis of triangular monolayered WS2 flakes with good uniformity and single-crystal by adjusting the introduction time of sulfur precursor and the distances between the sources and substrates to control the nucleation density. Investigation of the morphology and structure by transmission electron microscopy and Raman spectroscopy indicates that a series of triangular (side length of 233 μm) monolayered WS2 flakes shows high-quality structure and homogenous crystallinity...
June 13, 2018: ACS Applied Materials & Interfaces
Natasha Goyal, Naveen Kaushik, Himani Jawa, Saurabh Lodha
Few layer black phosphorus (BP) has recently emerged as a potential graphene analogue due to its high mobility and direct, appreciable, band gap. The fabrication and characterization of field effect transistors (FETs) involves exposure of the channel material to an electron beam (e-beam) in imaging techniques such as transmission electron microscopy (TEM) and scanning electron microscopy (SEM), and fabrication techniques like electron beam lithography (EBL). Despite this, the effect of e-beam irradiation on BP-FET performance has not been studied experimentally...
June 13, 2018: Nanoscale
Laura A Rice, Zadok Isaacs, Cherita Ousley, Jacob Sosnoff
Background: Falls are a common concern for wheeled mobility device users with multiple sclerosis (MS); however, no evidence-based fall prevention programs have been developed to meet the specific needs of the population. We examine the preliminary feasibility of a fall management intervention in wheeled mobility device users with MS. Methods: Study participants were exposed to an intervention program targeting risk factors for falls, including transfer skills and seated postural control...
May 2018: International Journal of MS Care
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