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https://www.readbyqxmd.com/read/29314326/stable-light-emitting-diodes-using-phase-pure-ruddlesden-popper-layered-perovskites
#1
Hsinhan Tsai, Wanyi Nie, Jean-Christophe Blancon, Constantinos C Stoumpos, Chan Myae Myae Soe, Jinkyoung Yoo, Jared Crochet, Sergei Tretiak, Jacky Even, Aditya Sadhanala, Giovanni Azzellino, Roberto Brenes, Pulickel M Ajayan, Vladimir Bulović, Samuel D Stranks, Richard H Friend, Mercouri G Kanatzidis, Aditya D Mohite
State-of-the-art light-emitting diodes (LEDs) are made from high-purity alloys of III-V semiconductors, but high fabrication cost has limited their widespread use for large area solid-state lighting. Here, efficient and stable LEDs processed from solution with tunable color enabled by using phase-pure 2D Ruddlesden-Popper (RP) halide perovskites with a formula (CH3 (CH2 )3 NH3 )2 (CH3 NH3 )n-1 Pbn I3n+1 are reported. By using vertically oriented thin films that facilitate efficient charge injection and transport, efficient electroluminescence with a radiance of 35 W Sr-1 cm-2 at 744 nm with an ultralow turn-on voltage of 1 V is obtained...
January 3, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29239354/an-electric-eel-inspired-soft-power-source-from-stacked-hydrogels
#2
Thomas B H Schroeder, Anirvan Guha, Aaron Lamoureux, Gloria VanRenterghem, David Sept, Max Shtein, Jerry Yang, Michael Mayer
Progress towards the integration of technology into living organisms requires electrical power sources that are biocompatible, mechanically flexible, and able to harness the chemical energy available inside biological systems. Conventional batteries were not designed with these criteria in mind. The electric organ of the knifefish Electrophorus electricus (commonly known as the electric eel) is, however, an example of an electrical power source that operates within biological constraints while featuring power characteristics that include peak potential differences of 600 volts and currents of 1 ampere...
December 13, 2017: Nature
https://www.readbyqxmd.com/read/29222854/optical-design-of-an-in-vivo-laparoscopic-lighting-system
#3
Xiaolong Liu, Reza Yazdanpanah Abdolmalaki, Gregory J Mancini, Jindong Tan
This paper proposes an in vivo laparoscopic lighting system design to address the illumination issues, namely poor lighting uniformity and low optical efficiency, existing in the state-of-the-art in vivo laparoscopic cameras. The transformable design of the laparoscopic lighting system is capable of carrying purposefully designed freeform optical lenses for achieving lighting performance with high illuminance uniformity and high optical efficiency in a desired target region. To design freeform optical lenses for extended light sources such as LEDs with Lambertian light intensity distributions, we present an effective and complete freeform optical design method...
December 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29170239/current-induced-strong-diamagnetism-in-the-mott-insulator-ca2ruo4
#4
Chanchal Sow, Shingo Yonezawa, Sota Kitamura, Takashi Oka, Kazuhiko Kuroki, Fumihiko Nakamura, Yoshiteru Maeno
Mott insulators can host a surprisingly diverse set of quantum phenomena when their frozen electrons are perturbed by various stimuli. Superconductivity, metal-insulator transition, and colossal magnetoresistance induced by element substitution, pressure, and magnetic field are prominent examples. Here we report strong diamagnetism in the Mott insulator calcium ruthenate (Ca2RuO4) induced by dc electric current. The application of a current density of merely 1 ampere per centimeter squared induces diamagnetism stronger than that in other nonsuperconducting materials...
November 24, 2017: Science
https://www.readbyqxmd.com/read/29149500/ep-radiofrequency-generators-significant-offsets-between-selected-and-delivered-power
#5
Felix Bourier, Bernhard Schwarz, Amir Brkic, Lara Wolf, Verena Semmler, Marc Kottmaier, Elena Risse, Marta Telishevska, Stephanie Brooks, Sarah Lengauer, Marielouise Kornmayer, Katharina Koch-Büttner, Florian Berger, Gabriele Hessling, Isabel Deisenhofer, Tilko Reents
INTRODUCTION: For radiofrequency ablation, the EP Shuttle®, Ampere®, and SmartAblate® generator models are most frequently used in clinical practice. The aim of this study was to assess the correlation between selected and delivered RF power for different generators. METHODS AND RESULTS: In an experimental setup, ablation catheters were connected to the EP Shuttle®, Ampere®, and SmartAblate® generators. The power delivered by the generators was measured using a current converter and an oscilloscope...
November 17, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/29058160/equivalent-reduction-in-greenhouse-gas-emissions-by-mahayana-buddhists-practicing-vegetarian-diets
#6
Ampere A Tseng
The equivalent reduction in greenhouse gas emissions (GHGEs) by Mahayana Buddhists with vegetarian diets is quantitatively evaluated. The Buddhists in seven Mahayana-dominated countries or regions, i.e., China, Japan, Vietnam, South Korea, Taiwan, Hong Kong, and Singapore, are studied. Assessments of the vegetarian population among these Mahayana-dominated countries or regions are performed. Correlation formulas based on data from a national survey are developed to quantify the GHGEs of various dietary groups by using the meat consumption as the only required input...
October 20, 2017: Journal of Religion and Health
https://www.readbyqxmd.com/read/29038458/observation-of-current-induced-bulk-magnetization-in-elemental-tellurium
#7
Tetsuya Furukawa, Yuri Shimokawa, Kaya Kobayashi, Tetsuaki Itou
The magnetoelectric effect in bulk matter is of growing interest both fundamentally and technologically. Since the beginning of the century, the magnetoelectric effect has been studied intensively in multiferroic materials. However, magnetoelectric phenomena in materials without any (anti-)ferroic order remain almost unexplored. Here we show the observation of a new class of bulk magnetoelectric effect, by revisiting elemental trigonal tellurium. We demonstrate that elemental tellurium, which is a nonmagnetic semiconductor, exhibits current-induced magnetization...
October 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/29036152/single-freeform-surface-design-for-prescribed-input-wavefront-and-target-irradiance
#8
Christoph Bösel, Herbert Gross
In beam shaping applications, the minimization of the number of necessary optical elements for the beam shaping process can benefit the compactness of the optical system and reduce its cost. The single freeform surface design for input wavefronts, which are neither planar nor spherical, is therefore of interest. In this work, the design of single freeform surfaces for a given zero-étendue source and complex target irradiances is investigated. Hence, not only collimated input beams or point sources are assumed...
September 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29034338/desorption-of-harmful-hydrocarbon-compounds-in-soil-using-micron-sized-magnetic-particles-and-high-frequency-magnetic-fields
#9
Bailey S Tye, Rushi J Vyas
This research looks at the use of high frequency (HF) magnetic fields to desorb/reduce harmful chemical compounds within gasoline and diesel that commonly leak out of underground storage tanks. Using a multi-strand coil design, measured magnetic fields of over 3 kilo-amperes per meter are generated at an optimal frequency of 117 kHz without skin-depth losses, and without the use of expensive super-conductors or liquid-cooled mechanisms. This high frequency magnetic field is successfully used in non-contact-based magnetic heating and desorption of Gasoline and Diesel mixed with sand, water and easily-dispersible, benign micrometer-sized iron filings, used as a magnetic absorber...
October 2017: Heliyon
https://www.readbyqxmd.com/read/28950621/radial-structure-of-the-constricted-positive-column-modeling-and-experiment
#10
Yu Golubovskii, D Kalanov, V Maiorov
We present a detailed self-consistent model of a positive column in argon glow discharge at moderate pressures and currents. This model describes the discharge transition between diffuse and constricted states. The model includes an extensive set of plasma chemical reactions and equation for inhomogeneous gas heating. The nonequilibrium behavior of an electron distribution function is also considered. One of the main features of the model is an accurate treatment of radiation trapping by solving the Holstein-Biberman equation directly...
August 2017: Physical Review. E
https://www.readbyqxmd.com/read/28888402/investigating-the-potential-of-multiwalled-carbon-nanotubes-based-zinc-nanocomposite-as-a-recognition-interface-towards-plant-pathogen-detection
#11
Muhammad Ali Tahir, Sadaf Hameed, Anam Munawar, Imran Amin, Shahid Mansoor, Waheed S Khan, Sadia Zafar Bajwa
The emergence of nanotechnology has opened new horizons for constructing efficient recognition interfaces. This is the first report where the potential of a multiwalled carbon nanotube based zinc nanocomposite (MWCNTs-Zn NPs) investigated for the detection of an agricultural pathogen i.e. Chili leaf curl betasatellite (ChLCB). Atomic force microscope analyses revealed the presence of multiwalled carbon nanotubes (MWCNTs) having a diameter of 50-100nm with zinc nanoparticles (Zn-NPs) of 25-500nm. In this system, these bunches of Zn-NPs anchored along the whole lengths of MWCNTs were used for the immobilization of probe DNA strands...
September 6, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28884573/cornlike-ordered-mesoporous-silicon-particles-modified-by-nitrogen-doped-carbon-layer-for-the-application-of-li-ion-battery
#12
Bing Lu, Bingjie Ma, Xinglan Deng, Wangwu Li, Zhenyu Wu, Hongbo Shu, Xianyou Wang
The cornlike ordered mesoporous silicon (OM-Si) particles modified by the nitrogen-doped carbon layer (OM-Si@NC) are successfully fabricated and used as the anode of lithium-ion battery (LIBs). The influences of the N-doped carbon layer on the structure and electrochemical properties of the OM-Si@NC composite are detailedly investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectrum, X-ray photoelectron spectroscopy (XPS), and charge/discharge tests. The results reveal that the amorphous N-doped carbon layer can offer the abundant conductive pathways for fast lithium ion transportation and electron transfer, which not only leads to a high specific capacity under high ampere density but also serves as a structural barrier maintaining the whole integrity and settling the mechanical breaking due to the huge volume changes of Si host...
September 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28877098/a-3-dimensional-printed-ultrasound-probe-visuospatial-trainer
#13
Ryan T McKenna, Jesse C Dove, Robert A Ratzlaff, Jose L Diaz-Gomez, Daniel J Cox, Leslie V Simon
Training adult learners to use ultrasound in clinical practice relies on the ability of the learner to apply visuospatial concepts to the anatomy of the human body. We describe a visuospatial trainer that replicates the housing of an ultrasound transducer, through which a linear laser projects light in the same plane and orientation as the ultrasonic sound waves. We use this trainer in combination with a porcine heart dissection laboratory to teach bedside cardiac ultrasound and transthoracic echocardiography (TTE)...
September 4, 2017: Ultrasound Quarterly
https://www.readbyqxmd.com/read/28764513/note-diagnostic-deuterium-beam-with-an-ultra-small-energy-spread-for-plasma-spectroscopy
#14
V Ya Savkin, A A Lizunov
The DINA-5M diagnostic atomic beam has been upgraded to reduce the energy spread down to 50 eV. An active voltage stabilization system introduces a chain of varistors connected in series that can be switched with the time constant of 70 μs to minimize the deviation from the reference to the high-voltage level. Using deuterium, the enhanced diagnostic beam has the current of four atomic amperes and the energy of 50 keV ± 50 eV. The primary considered application is a motional Stark effect diagnostic combined with laser-induced fluorescence, where the beam energy spread is an ultimate parameter determining the measurement performance...
July 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28615472/neuronal-circadian-clock-protein-oscillations-are-similar-in-behaviourally-rhythmic-forager-honeybees-and-in-arrhythmic-nurses
#15
T Fuchikawa, K Beer, C Linke-Winnebeck, R Ben-David, A Kotowoy, V W K Tsang, G R Warman, E C Winnebeck, C Helfrich-Förster, G Bloch
Internal clocks driving rhythms of about a day (circadian) are ubiquitous in animals, allowing them to anticipate environmental changes. Genetic or environmental disturbances to circadian clocks or the rhythms they produce are commonly associated with illness, compromised performance or reduced survival. Nevertheless, some animals including Arctic mammals, open sea fish and social insects such as honeybees are active around-the-clock with no apparent ill effects. The mechanisms allowing this remarkable natural plasticity are unknown...
June 2017: Open Biology
https://www.readbyqxmd.com/read/28595038/bio-electric-field-enhancement-the-influence-on-hyaluronan-mediated-motility-receptors-in-human-breast-carcinoma
#16
Marcy C Purnell
Mechanisms that regulate cancer cell metastasis are often intricately linked to mechanisms that control cell migration in wound repair. Hyaluronan Mediated Motility Receptor (HMMR) encodes a receptor for hyaluronan-mediated motility (RHAMM), a non-integral cell surface hyaluronan receptor and intracellular protein that promotes mitotic spindle formation and cell motility. RHAMM has been found to have increased expression in both cancers and wounds, and when cancers show increased RHAMM expression poor outcomes have occurred...
April 2017: Discovery Medicine
https://www.readbyqxmd.com/read/28593211/architecture-of-conx-single-clusters-on-nanocarbon-as-excellent-oxygen-reduction-catalysts-with-high-efficient-atomic-utilization
#17
Ting He, Hui Xue, Xiaojuan Wang, Shuanghua He, Yulai Lei, Yuyuan Zhang, Rujuan Shen, Yi Zhang, Juan Xiang
A new strategy to fabricate CoNx single cluster supported nanocarbon catalysts (C/P/2Co600) with enhanced atomic utilization towards the oxygen reduction reaction (ORR) is reported. N-Coordination protection and low-temperature pyrolysis are the two key factors for the formation of CoNx single clusters on nanocarbon supports. Morphological and structural identification confirmed the simultaneous anchoring of homo-dispersed CoNx single clusters and N-doping on the nanocarbon under relatively mild thermal treatment conditions...
June 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28190940/lipschitz-estimates-for-commutators-of-singular-integral-operators-associated-with-the-sections
#18
Guangqing Wang, Jiang Zhou
Let H be Monge-Ampère singular integral operator, [Formula: see text], and [Formula: see text]. It is proved that the commutator [Formula: see text] is bounded from [Formula: see text] to [Formula: see text] for [Formula: see text] and from [Formula: see text] to [Formula: see text] for [Formula: see text]. For the extreme case [Formula: see text], a weak estimate is given.
2017: Journal of Inequalities and Applications
https://www.readbyqxmd.com/read/28105928/computer-aided-identification-of-a-hevein-like-antimicrobial-peptide-of-bell-pepper-leaves-for-biotechnological-use
#19
Patrícia Dias Games, Elói Quintas Gonçalves daSilva, Meire de Oliveira Barbosa, Hebréia Oliveira Almeida-Souza, Patrícia Pereira Fontes, Marcos Jorge deMagalhães, Paulo Roberto Gomes Pereira, Maura Vianna Prates, Gloria Regina Franco, Alessandra Faria-Campos, Sérgio Vale Aguiar Campos, Maria Cristina Baracat-Pereira
BACKGROUND: Antimicrobial peptides from plants present mechanisms of action that are different from those of conventional defense agents. They are under-explored but have a potential as commercial antimicrobials. Bell pepper leaves ('Magali R') are discarded after harvesting the fruit and are sources of bioactive peptides. This work reports the isolation by peptidomics tools, and the identification and partially characterization by computational tools of an antimicrobial peptide from bell pepper leaves, and evidences the usefulness of records and the in silico analysis for the study of plant peptides aiming biotechnological uses...
December 15, 2016: BMC Genomics
https://www.readbyqxmd.com/read/28094940/high-electronic-conductance-through-double-helix-dna-molecules-with-fullerene-anchoring-groups
#20
Kathia L Jiménez-Monroy, Nicolas Renaud, Jeroen Drijkoningen, David Cortens, Koen Schouteden, Christian van Haesendonck, Wanda J Guedens, Jean V Manca, Laurens D A Siebbeles, Ferdinand C Grozema, Patrick H Wagner
Determining the mechanism of charge transport through native DNA remains a challenge as different factors such as measuring conditions, molecule conformations, and choice of technique can significantly affect the final results. In this contribution, we have used a new approach to measure current flowing through isolated double-stranded DNA molecules, using fullerene groups to anchor the DNA to a gold substrate. Measurements were performed at room temperature in an inert environment using a conductive AFM technique...
February 16, 2017: Journal of Physical Chemistry. A
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