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flexible electronics

Iñaki Soto-Rey, Philipp Neuhaus, Philipp Bruland, Sophia Geßner, Julian Varghese, Stefan Hegselmann, Tobias Brix, Martin Dugas, Michael Storck
CDISC's Operational Data Model (ODM) is a flexible standard for exchanging and archiving metadata and subject clinical data in clinical trials. The Portal of Medical Data Models (MDM-Portal) uses ODM to store more than 15000 medical forms. As not every electronic health system accepts ODM as input format, there is a need for conversion between ODM and other data standards and formats. This research proposes a standardised template-based process to develop ODM converters. So far, ten converters have been developed and integrated in the MDM-Portal following this process and new ones should be included soon...
2018: Studies in Health Technology and Informatics
Fabian Spitzer, Gabor Balazs, Christian Graßl, Martin Keilwerth, Karsten Meyer, Manfred Scheer
A first systematic study of the activation of As4 by Co complexes is presented. Three different low-valent [LCo(tol)] (L = β-diiminato) complexes reveal different steric influences as well as the electronic influence of their adjacent substituents. Dipp (2,6-diisopropylphenyl) and dmp (2,6-dimethylphenyl) flanking groups were applied, one of the ligands with H backbone substituents (β-dialdiminate L0) and two with Me substituents (β-diketiminates L3 and L1). In the reaction with As4, different dinuclear products [(LCo)2As4] (LM = L0 (1), L1 (2), L3 (3)) were isolated, each of them representing an individually shaped [Co2As4] core in the solid state: octahedral in 1, prismatic in 2 and asterane-like in 3...
April 20, 2018: Angewandte Chemie
F Rizzo, A Augieri, A Kursumovic, M Bianchetti, L Opherden, M Sieger, R Hühne, J Hänisch, A Meledin, G Van Tendeloo, J L MacManus-Driscoll, G Celentano
An outstanding current carrying performance (namely critical current density, Jc) over a broad temperature range of 10-77 K for magnetic fields up to 12 T is reported for films of YBa2Cu3O7-x with Ba2Y(Nb,Ta)O6 inclusion pinning centres (YBCO-BYNTO) and thicknesses in the range of 220-500 nm. Jc values of 10 MA cm-2 were measured at 30 K - 5 T and 10 K - 9 T with a corresponding maximum of the pinning force density at 10 K close to 1 TN m-3. The system is very flexible regarding properties and microstructure tuning, and the growth window for achieving a particular microstructure is wide, which is very important for industrial processing...
April 20, 2018: Nanoscale
Yuejiao Chen, Bingang Xu, Jianfeng Wen, Jianliang Gong, Tao Hua, Chi-Wai Kan, Jiwei Deng
Rapid advances in functional electronics bring tremendous demands on innovation toward effective designs of device structures. Yarn supercapacitors (SCs) show advantages of flexibility, knittability, and small size, and can be integrated into various electronic devices with low cost and high efficiency for energy storage. In this work, functionalized stainless steel yarns are developed to support active materials of positive and negative electrodes, which not only enhance capacitance of both electrodes but can also be designed into stretchable configurations...
April 19, 2018: Small
Daiki Shimizu, Atsuhiro Osuka
The non-innocent ligand nature of porphyrins was observed for compound I in enzymatic cycles of cytochrome P450. Such porphyrin radicals were first regarded as reactive intermediates in catabolism, but recent studies have revealed that porphyrinoids, including porphyrins, ring-contracted porphyrins, and ring-expanded porphyrins, display excellent radical-stabilizing abilities to the extent that radicals can be handled like usual closed-shell organic molecules. This review surveys four types of stable porphyrinoid radical and covers their synthetic methods and properties such as excellent redox properties, NIR absorption, and magnetic properties...
February 14, 2018: Chemical Science
Dongjie Zhu, Xiangxi Wang, Qianglin Fang, James L Van Etten, Michael G Rossmann, Zihe Rao, Xinzheng Zhang
The Ewald sphere effect is generally neglected when using the Central Projection Theorem for cryo electron microscopy single-particle reconstructions. This can reduce the resolution of a reconstruction. Here we estimate the attainable resolution and report a "block-based" reconstruction method for extending the resolution limit. We find the Ewald sphere effect limits the resolution of large objects, especially large viruses. After processing two real datasets of large viruses, we show that our procedure can extend the resolution for both datasets and can accommodate the flexibility associated with large protein complexes...
April 19, 2018: Nature Communications
Zhai Zhaolan, Yan Xinyan, Ji Xu, Song Zhanqian, Shang Shibin, Xiaoping Rao
The phase behaviors and aggregates in a catanionic system have been investigated. The anionic surfactants in the mixed systems are sodium N-alkyl-maleimidepimaric carboxylate (Cn-MPA-Na, n=12, 14, 16), which are prepared from rosin and contain a large rigid skeleton and a flexible alkane chain. And the cationic surfactant is cetyltrimethylammonium bromide (CTAB). The phase behavior of C14-MPA-Na/CTAB system transforms form a viscoelastic solution to an aqueous surfactant two-phase system (ASTP), an aqueous surfactant three-phase system (AS3P) and an anisotropic homogeneous phase in sequence when C14-MPA-Na concentration continuously increases from 10 to 35 mM...
April 19, 2018: Chemistry: a European Journal
Hongwei Lei, Xiaofeng Chen, Lingwei Xue, Linhao Sun, Jianjun Chen, Zuojun Tan, Zhi-Guo Zhang, Yongfang Li, Guojia Fang
A room-temperature solution-processed pillar[5]arene-based small molecule material, termed C3, has been designed, synthesized, and incorporated between a conventional PCBM electron transport layer (ETL) and a metal electrode to function as a single-layer cathode buffer layer (CBL) for efficient planar p-i-n perovskite solar cells (PVSCs). It has been found that C3 has a work function tunneling effect, which can decrease the work function of the Ag electrode; therefore, introduction of C3 successfully enhances the interface contact and reduces the interface barriers, which usually exist between fullerene derivatives and metal electrodes...
April 19, 2018: Nanoscale
Yanfei Xu, Xiaoxue Wang, Jiawei Zhou, Bai Song, Zhang Jiang, Elizabeth M Y Lee, Samuel Huberman, Karen K Gleason, Gang Chen
Traditional polymers are both electrically and thermally insulating. The development of electrically conductive polymers has led to novel applications such as flexible displays, solar cells, and wearable biosensors. As in the case of electrically conductive polymers, the development of polymers with high thermal conductivity would open up a range of applications in next-generation electronic, optoelectronic, and energy devices. Current research has so far been limited to engineering polymers either by strong intramolecular interactions, which enable efficient phonon transport along the polymer chains, or by strong intermolecular interactions, which enable efficient phonon transport between the polymer chains...
March 2018: Science Advances
Qiankun Zhang, Chunhua An, Shuangqing Fan, Sigang Shi, Rongjie Zhang, Jing Zhang, Quanning Li, Daihua Zhang, Xiaodong Hu, Jing Liu
Minimizing the strain induced undesirable effects is one of the major efforts to be made for flexible electronics. This work reports a highly sensitive flexible gas sensor with ultra-low strain response, which is potentially suitable for wearable electronics applications. The gas sensing material is a free-standing and flexible thin film made of graphene/ethyl cellulose (EC) nanocomposite, which is then integrated with flexible substrate of polyethylene terephthalate. The sensor exhibits relative resistance change within 0...
April 18, 2018: Nanotechnology
Aditi Naik, Jae Joon Kim, Özlem Usluer, D Leonardo Gonzalez Arellano, Ethan B Secor, Antonio Facchetti, Mark C Hersam, Alejandro L Briseno, James J Watkins
The scalable fabrication of high-resolution electrodes and interconnects is necessary to enable advanced, high-performance, printed and flexible electronics. Here, we demonstrate the direct printing of graphene patterns with feature widths from 300 µm to ~310 nm by liquid-bridge-mediated nanotransfer molding. This solution-based technique enables residue-free printing of graphene patterns on a variety of substrates with surface energies between ~43 and 73 mN m-1 . Using printed graphene source and drain electrodes, high-performance organic field-effect transistors (OFETs) are fabricated with single-crystal rubrene (p-type) and fluorocarbon-substituted dicyanoperylene-3,4:9,10-bis(dicarboximide) (PDIF-CN2 ) (n-type) semiconductors...
April 18, 2018: ACS Applied Materials & Interfaces
Xiaomin Xu, Kenjiro Fukuda, Akchheta Karki, Sungjun Park, Hiroki Kimura, Hiroaki Jinno, Nobuhiro Watanabe, Shuhei Yamamoto, Satoru Shimomura, Daisuke Kitazawa, Tomoyuki Yokota, Shinjiro Umezu, Thuc-Quyen Nguyen, Takao Someya
Flexible photovoltaics with extreme mechanical compliance present appealing possibilities to power Internet of Things (IoT) sensors and wearable electronic devices. Although improvement in thermal stability is essential, simultaneous achievement of high power conversion efficiency (PCE) and thermal stability in flexible organic photovoltaics (OPVs) remains challenging due to the difficulties in maintaining an optimal microstructure of the active layer under thermal stress. The insufficient thermal capability of a plastic substrate and the environmental influences cannot be fully expelled by ultrathin barrier coatings...
April 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
Jennifer Selinski, Renate Scheibe, David A Day, James Whelan
The alternative pathway of mitochondrial electron transport, which terminates in the alternative oxidase (AOX), uncouples oxidation of substrate from mitochondrial ATP production, yet plant performance is improved under adverse growth conditions. AOX is regulated at different levels. Identification of regulatory transcription factors shows that Arabidopsis thaliana AOX1a is under strong transcriptional suppression. At the protein level, the primary structure is not optimised for activity. Maximal activity requires the presence of various metabolites, such as tricarboxylic acid-cycle intermediates that act in an isoform-specific manner...
April 14, 2018: Trends in Plant Science
Zhe Wang, Boyang Mao, Qianlong Wang, Jun Yu, Jixiang Dai, Rongguo Song, Zonghua Pu, Daping He, Zhi Wu, Shichun Mu
To guarantee the normal operation of next generation portable electronics and wearable devices, together with avoiding electromagnetic wave pollution, it is urgent to find a material possessing flexibility, ultrahigh conductive, and superb electromagnetic interference shielding effectiveness (EMI SE) simultaneously. In this work, inspired by a building bricks toy with the interlock system, we design and fabricate a copper/large flake size graphene (Cu/LG) composite thin film (≈8.8 μm) in the light of high temperature annealing of a large flake size graphene oxide film followed by magnetron sputtering of copper...
April 17, 2018: Small
Seung-Kyun Kang, Jahyun Koo, Yoon Kyeung Lee, John A Rogers
Recent advances in materials chemistry establish the foundations for unusual classes of electronic systems, characterized by their ability to fully or partially dissolve, disintegrate, or otherwise physically or chemically decompose in a controlled fashion after some defined period of stable operation. Such types of "transient" technologies may enable consumer gadgets that minimize waste streams associated with disposal, implantable sensors that disappear harmlessly in the body, and hardware-secure platforms that prevent unwanted recovery of sensitive data...
April 17, 2018: Accounts of Chemical Research
Gianni Virgili, Ruthy Acosta, Sharon A Bentley, Giovanni Giacomelli, Claire Allcock, Jennifer R Evans
BACKGROUND: The purpose of low-vision rehabilitation is to allow people to resume or to continue to perform daily living tasks, with reading being one of the most important. This is achieved by providing appropriate optical devices and special training in the use of residual-vision and low-vision aids, which range from simple optical magnifiers to high-magnification video magnifiers. OBJECTIVES: To assess the effects of different visual reading aids for adults with low vision...
April 17, 2018: Cochrane Database of Systematic Reviews
Gengrui Zhao, Xiaodi Zhang, Xin Cui, Shu Wang, Zhirong Liu, Lin Deng, Anhui Qi, Xiran Qiao, Lijie Li, Caofeng Pan, Yan Zhang, Linlin Li
To meet the growing demands in flexible and wearable electronics, various sensors have been designed for detecting and monitoring the physical quantity changes. However, most of these sensors can only detect one certain kind of physical quantity based on a single mechanism. In this paper, we have fabricated a multifunctional sensor made from carbonized electrospun polyacrylonitrile/barium titanate (PAN-C/BTO) nanofiber film. It can detect two physical quantities (pressure and curvature), independently and simultaneously, by integrating piezoresistive, piezoelectric and triboelectric effect...
April 17, 2018: ACS Applied Materials & Interfaces
Qu Yang, Ziyao Zhou, Liqian Wang, Hongjia Zhang, Yuxin Cheng, Zhongqiang Hu, Bin Peng, Ming Liu
To meet the demand of developing compatible and energy-efficient flexible spintronics, voltage manipulation of magnetism on soft substrates is in demand. Here, a voltage tunable flexible field-effect transistor structure by ionic gel (IG) gating in perpendicular synthetic anti-ferromagnetic nanostructure is demonstrated. As a result, the interlayer Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction can be tuned electrically at room temperature. With a circuit gating voltage, anti-ferromagnetic (AFM) ordering is enhanced or converted into an AFM-ferromagnetic (FM) intermediate state, accompanying with the dynamic domain switching...
April 16, 2018: Advanced Materials
Martin Peter Bircher, Ursula Rothlisberger
Linear-response time-dependent density functional theory (LR-TDDFT) has become a valuable tool in the calculation of excited states of molecules of various sizes. However, standard generalised gradient approximation (GGA) and hybrid exchange-correlation (xc) functionals often fail to correctly predict charge-transfer (CT) excitations with low orbital overlap, thus limiting the scope of the method. The Coulomb-attenuation method (CAM) in the form of the CAM-B3LYP functional has been shown to reliably remedy this problem in many CT systems, making accurate predictions possible...
April 16, 2018: Journal of Chemical Theory and Computation
Javier Cerezo, Daniel Aranda, Francisco J Avila Ferrer, Giacomo Prampolini, Giuseppe Mazzeo, Giovanna Longhi, Sergio Abbate, Fabrizio Santoro
We extend a recently proposed mixed quantum/classical method for computing the vibronic electronic circular dichroism (ECD) spectrum of molecules with different conformers, to cases where more than one hindered rotation is present. The method generalizes the standard procedure, based on the simple Boltzmann average of the vibronic spectra of the stable conformers, and includes the contribution of structures that sample all the accessible conformational space. It is applied to the simulation of the ECD spectrum of (S)-2,2,2-trifluoroanthrylethanol, a molecule with easily interconvertible conformers, whose spectrum exhibits a pattern of alternating positive and negative vibronic peaks...
April 16, 2018: Chirality
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