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https://www.readbyqxmd.com/read/27918116/multiferroic-nanopatterned-hybrid-material-with-room-temperature-magnetic-switching-of-the-electric-polarization
#1
Ronggang Cai, Vlad-Andrei Antohe, Zhijun Hu, Bernard Nysten, Luc Piraux, Alain M Jonas
A nanopatterned hybrid layer is designed, wherein the electric polarization can be flipped at room temperature by a magnetic field aided by an electrical field. This is achieved by embedding ferromagnetic nanopillars in a continuous organic ferroelectric layer, and amplifying the magnetostriction-generated stress gradients by scaling down the supracrystalline cell of the material.
December 5, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27914343/fluorescence-and-drug-loading-properties-of-znse-mn-zns-paclitaxel-sio2-nanocapsules-templated-by-f127-micelles
#2
Tingting Zhao, Xin Liu, Yuebin Li, Mingguang Zhang, Jian He, Xuewen Zhang, Hui Liu, Xingguo Wang, Haoshuang Gu
Hydrophobic ZnSe:Mn/ZnS core-shell fluorescence quantum dots (QDs) and anticancer drug paclitaxel (PTX) have been co-loaded into folate conjugated hybrid silica nanocapsules via F127 micelles based soft-template method in a mild aqueous environment at room temperature. The encapsulation of QDs shows a F127: QDs mass ratio dependent behavior, which impact much on the morphology and optical properties of composite nanocapsules. These as prepared composite nanocapsules also exhibit good photoluminescence stability under the temperature ranges from 19°C to 49°C...
November 23, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27894498/noncompressible-torso-hemorrhage
#3
REVIEW
Jonathan J Morrison
Noncompressible torso hemorrhage (NCTH) constitutes a leading cause of potentially preventable trauma mortality. NCTH is defined by high-grade injury present in one or more of the following anatomic domains: pulmonary, solid abdominal organ, major vascular or pelvic trauma; plus hemodynamic instability or the need for immediate hemorrhage control. Rapid operative management, as part of a damage control resuscitation strategy, remains the mainstay of treatment. However, endovascular techniques are evolving and may become more mainstream with the advent of hybrid rooms that can deliver concurrent open and radiologic/endovascular management of traumatic hemorrhage...
January 2017: Critical Care Clinics
https://www.readbyqxmd.com/read/27892463/reconfigurable-exciton-plasmon-interconversion-for-nanophotonic-circuits
#4
Hyun Seok Lee, Dinh Hoa Luong, Min Su Kim, Youngjo Jin, Hyun Kim, Seokjoon Yun, Young Hee Lee
The recent challenges for improving the operation speed of nanoelectronics have motivated research on manipulating light in on-chip integrated circuits. Hybrid plasmonic waveguides with low-dimensional semiconductors, including quantum dots and quantum wells, are a promising platform for realizing sub-diffraction limited optical components. Meanwhile, two-dimensional transition metal dichalcogenides (TMDs) have received broad interest in optoelectronics owing to tightly bound excitons at room temperature, strong light-matter and exciton-plasmon interactions, available top-down wafer-scale integration, and band-gap tunability...
November 28, 2016: Nature Communications
https://www.readbyqxmd.com/read/27892462/unraveling-the-planar-globular-transition-in-gold-nanoclusters-through-evolutionary-search
#5
Alper Kinaci, Badri Narayanan, Fatih G Sen, Michael J Davis, Stephen K Gray, Subramanian K R S Sankaranarayanan, Maria K Y Chan
Au nanoclusters are of technological relevance for catalysis, photonics, sensors, and of fundamental scientific interest owing to planar to globular structural transformation at an anomalously high number of atoms i.e. in the range 12-14. The nature and causes of this transition remain a mystery. In order to unravel this conundrum, high throughput density functional theory (DFT) calculations, coupled with a global structural optimization scheme based on a modified genetic algorithm (GA) are conducted. More than 20,000 Au12, Au13, and Au14 nanoclusters are evaluated...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27877868/room-temperature-synthesis-of-three-dimensional-porous-zno-cuni-hybrid-magnetic-layers-with-photoluminescent-and-photocatalytic-properties
#6
Miguel Guerrero, Jin Zhang, Ainhoa Altube, Eva García-Lecina, Mònica Roldan, Maria Dolors Baró, Eva Pellicer, Jordi Sort
A facile synthetic approach to prepare porous ZnO@CuNi hybrid films is presented. Initially, magnetic CuNi porous layers (consisting of phase separated CuNi alloys) are successfully grown by electrodeposition at different current densities using H2 bubbles as a dynamic template to generate the porosity. The porous CuNi alloys serve as parent scaffolds to be subsequently filled with a solution containing ZnO nanoparticles previously synthesized by sol-gel. The dispersed nanoparticles are deposited dropwise onto the CuNi frameworks and the solvent is left to evaporate while the nanoparticles impregnate the interior of the pores, rendering ZnO-coated CuNi 3D porous structures...
2016: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/27866141/transapical-aortic-stenting-an-initial-case-series
#7
Tamer G Ghazy, Ahmed S Ouda, Ahmed M Mashhour, Manuel Wilbring, Klaus Matschke, Utz W Kappert
AIMS: The standard approach for thoracic endovascular aortic repair (TEVAR) is transfemoral; however, calcifications and tortuosity of the access vessels might be so extensive as to increase the operative risk markedly or preclude the procedure. This study evaluates the transapical approach as an alternative route for TEVAR in such patients. METHODS AND RESULTS: From June 2011 to July 2013, the institution's interdisciplinary board for aortic diseases initially denied TEVAR for eight patients with thoracic aortic pathology due to extensive calcification and tortuosity of the distal vessels...
November 20, 2016: EuroIntervention
https://www.readbyqxmd.com/read/27863095/new-mechanism-for-the-reduction-of-vanadyl-acetylacetonate-to-vanadium-acetylacetonate-for-room-temperature-flow-batteries
#8
Leon Shaw, Jack Shamie, Caihong Liu, Vincent Sprenkle
In this study, a new mechanism for the reduction of vanadyl acetylacetonate, VO(acac)2, to vanadium acetylacetonate, V(acac)3, is introduced. V(acac)3 has been studied for use in redox flow batteries for some time, however contamination by moisture leads to the formation of VO(acac)2. In previous work, once this transformation occurs, it is no longer reversible because there is a requirement of extreme low potentials for the reduction to occur. Here, we propose that with the presence of excess acetylacetone (Hacac) and free protons (H+) the reduction can take place between 2...
November 15, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27862778/reentrant-structural-and-optical-properties-and-large-positive-thermal-expansion-in-perovskite-formamidinium-lead-iodide
#9
Douglas H Fabini, Constantinos C Stoumpos, Geneva Laurita, Andreas Kaltzoglou, Athanassios G Kontos, Polycarpos Falaras, Mercouri G Kanatzidis, Ram Seshadri
The structure of the hybrid perovskite HC(NH2 )2 PbI3 (formamidinium lead iodide) reflects competing interactions associated with molecular motion, hydrogen bonding tendencies, thermally activated soft octahedral rotations, and the propensity for the Pb(2+) lone pair to express its stereochemistry. High-resolution synchrotron X-ray powder diffraction reveals a continuous transition from the cubic α-phase (Pm3‾ m, #221) to a tetragonal β-phase (P4/mbm, #127) at around 285 K, followed by a first-order transition to a tetragonal γ-phase (retaining P4/mbm, #127) at 140 K...
November 10, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27860172/high-purity-hybrid-organolead-halide-perovskite-nanoparticles-obtained-by-pulsed-laser-irradiation-in-liquid
#10
Vincenzo Amendola, Ilaria Fortunati, Carla Marega, Ahmed L Abdelhady, Makhsud I Saidaminov, Osman M Bakr
Nanoparticles of hybrid organic-inorganic perovskites are attracting a great deal of attention due to the variety of their optoelectronic properties, their low cost and the easier integration in devices with complex geometry compared to microcrystalline, thin-film or bulk metal halides. Here we present a novel one-step synthesis of organolead bromide perovskite nanocrystals based on pulsed laser irradiation in liquid environment (PLIL). Starting from a bulk CH3NH3PbBr3 crystal, our PLIL procedure does not involve the use of high boiling point polar solvents or templating agents, and runs at room temperature...
November 16, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/27859435/a-qm-mm-study-of-the-nature-of-the-entatic-state-in-plastocyanin
#11
Catherine A Hurd, Nicholas A Besley, David Robinson
Plastocyanin is a copper containing protein that is involved in the electron transfer process in photosynthetic organisms. The active site of plastocyanin is described as an entatic state whereby its structure represents a compromise between the structures favored by the oxidized and reduced forms. In this study, the nature of the entatic state is investigated through density functional theory-based hybrid quantum mechanics/molecular mechanics (QM/MM) molecular dynamics simulations. The strain energy is computed to be 12...
November 14, 2016: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/27849019/x-ray-scintillation-in-lead-halide-perovskite-crystals
#12
M D Birowosuto, D Cortecchia, W Drozdowski, K Brylew, W Lachmanski, A Bruno, C Soci
Current technologies for X-ray detection rely on scintillation from expensive inorganic crystals grown at high-temperature, which so far has hindered the development of large-area scintillator arrays. Thanks to the presence of heavy atoms, solution-grown hybrid lead halide perovskite single crystals exhibit short X-ray absorption length and excellent detection efficiency. Here we compare X-ray scintillator characteristics of three-dimensional (3D) MAPbI3 and MAPbBr3 and two-dimensional (2D) (EDBE)PbCl4 hybrid perovskite crystals...
November 16, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27831935/white-light-emission-by-phonon-assisted-coherent-mixing-of-excitons-in-au8-cds-hybrid-nanorods
#13
S Rath, O Halder, A Pradhani, B Satpati, A Maity, T K Chini, N Gogurla, S K Ray
Gold cluster (Au8) coated CdS hybrid nanorods (HNRs), synthesized using a sonication assisted assembly route, exhibit phonon assisted coherent mixing of excitons. As observed from optical absorption, Raman scattering, x-ray diffraction and transmission electron microscopic studies, the Au8 modulates the crystal-and electronic-structure of the CdS nanorods, effecting enhancement of exciton-phonon (e-p) interactions. The e-p interaction and entropy effect mediated phase matching of the excitonic transitions, leading-via cooperative and coherent mixing of the excitons' color-to the emission of white light, has been confirmed from room temperature and time resolved photoluminescence measurements...
December 9, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27829753/a-comparative-evaluation-of-microleakage-of-restorations-using-silorane-based-dental-composite-and-methacrylate-based-dental-composites-in-class-ii-cavities-an-in-vitro-study
#14
Jambai Sampath Kumar Sivakumar, A S Prasad, Saravanapriyan Soundappan, N Ragavendran, R Ajay, Krishnamoorthy Santham
AIM: The aim of this in vitro study was to evaluate and compare the microleakage of restorations using low shrinkage silorane-based dental composite and methacrylate-based dental composites in Class II cavity at the occlusal and gingival margins. MATERIALS AND METHODS: Sixty mandibular molars were collected and divided into three experimental groups and one negative control group. Class II slot cavity was prepared on the mesial surface. Experimental groups were restored with Group I: silorane-based microhybrid composite, Group II: methacrylate-based nanohybrid composite, and Group III: Methacrylate-based microhybrid composite, respectively...
October 2016: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/27828437/1-khz-two-dimensional-coherent-anti-stokes-raman-scattering-2d-cars-for-gas-phase-thermometry
#15
Joseph D Miller, Mikhail N Slipchenko, Jason G Mance, Sukesh Roy, James R Gord
Two-dimensional gas-phase coherent anti-Stokes Raman scattering (2D-CARS) thermometry is demonstrated at 1 kHz in a heated jet. A hybrid femtosecond/picosecond CARS configuration is used in a two-beam phase-matching arrangement with a 100-femtosecond pump/Stokes pulse and a 107-picosecond probe pulse. The femtosecond pulse is generated using a mode-locked oscillator and regenerative amplifier that is synchronized to a separate picosecond oscillator and burst-mode amplifier. The CARS signal is spectrally dispersed in a custom imaging spectrometer and detected using a high-speed camera with image intensifier...
October 31, 2016: Optics Express
https://www.readbyqxmd.com/read/27826525/nanostructured-germanium-deposited-on-heated-substrates-with-enhanced-photoelectric-properties
#16
Ionel Stavarache, Valentin Adrian Maraloiu, Petronela Prepelita, Gheorghe Iordache
Obtaining high-quality materials, based on nanocrystals, at low temperatures is one of the current challenges for opening new paths in improving and developing functional devices in nanoscale electronics and optoelectronics. Here we report a detailed investigation of the optimization of parameters for the in situ synthesis of thin films with high Ge content (50 %) into SiO2. Crystalline Ge nanoparticles were directly formed during co-deposition of SiO2 and Ge on substrates at 300, 400 and 500 °C. Using this approach, effects related to Ge-Ge spacing are emphasized through a significant improvement of the spatial distribution of the Ge nanoparticles and by avoiding multi-step fabrication processes or Ge loss...
2016: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/27817060/two-milp-models-for-scheduling-elective-surgeries-within-a-private-healthcare-facility
#17
Hejer Khlif Hachicha, Farah Zeghal Mansour
This paper deals with an Integrated Elective Surgery-Scheduling Problem (IESSP) that arises in a privately operated healthcare facility. It aims to optimize the resource utilization of the entire surgery process including pre-operative, per-operative and post-operative activities. Moreover, it addresses a specific feature of private facilities where surgeons are independent service providers and may conduct their surgeries in different private healthcare facilities. Thus, the problem requires the assignment of surgery patients to hospital beds, operating rooms and recovery beds as well as their sequencing over a 1-day period while taking into account surgeons' availability constraints...
November 5, 2016: Health Care Management Science
https://www.readbyqxmd.com/read/27812640/applications-for-a-hybrid-operating-room-in-thoracic-surgery-from-multidisciplinary-procedures-to-image-guided-video-assisted-thoracoscopic-surgery
#18
Ricardo Mingarini Terra, Juliano Ribeiro Andrade, Alessandro Wasum Mariani, Rodrigo Gobbo Garcia, Jose Ernesto Succi, Andrey Soares, Paulo Marcelo Zimmer
The concept of a hybrid operating room represents the union of a high-complexity surgical apparatus with state-of-the-art radiological tools (ultrasound, CT, fluoroscopy, or magnetic resonance imaging), in order to perform highly effective, minimally invasive procedures. Although the use of a hybrid operating room is well established in specialties such as neurosurgery and cardiovascular surgery, it has rarely been explored in thoracic surgery. Our objective was to discuss the possible applications of this technology in thoracic surgery, through the reporting of three cases...
September 2016: Jornal Brasileiro de Pneumologia: Publicaça̋o Oficial da Sociedade Brasileira de Pneumologia e Tisilogia
https://www.readbyqxmd.com/read/27805684/reducing-noise-in-a-raman-quantum-memory
#19
Philip J Bustard, Duncan G England, Khabat Heshami, Connor Kupchak, Benjamin J Sussman
Optical quantum memories are an important component of future optical and hybrid quantum technologies. Raman schemes are strong candidates for use with ultrashort optical pulses due to their broad bandwidth; however, the elimination of deleterious four-wave mixing noise from Raman memories is critical for practical applications. Here, we demonstrate a quantum memory using the rotational states of hydrogen molecules at room temperature. Polarization selection rules prohibit four-wave mixing, allowing the storage and retrieval of attenuated coherent states with a mean photon number 0...
November 1, 2016: Optics Letters
https://www.readbyqxmd.com/read/27794330/predicting-speech-intelligibility-based-on-a-correlation-metric-in-the-envelope-power-spectrum-domain
#20
Helia Relaño-Iborra, Tobias May, Johannes Zaar, Christoph Scheidiger, Torsten Dau
: A speech intelligibility prediction model is proposed that combines the auditory processing front end of the multi-resolution speech-based envelope power spectrum model [mr-sEPSM; Jørgensen, Ewert, and Dau (2013). J. Acoust. Soc. Am. 134(1), 436-446] with a correlation back end inspired by the short-time objective intelligibility measure [STOI; Taal, Hendriks, Heusdens, and Jensen (2011). IEEE Trans. Audio Speech Lang. PROCESS: 19(7), 2125-2136]. This "hybrid" model, named sEPSM(corr), is shown to account for the effects of stationary and fluctuating additive interferers as well as for the effects of non-linear distortions, such as spectral subtraction, phase jitter, and ideal time frequency segregation (ITFS)...
October 2016: Journal of the Acoustical Society of America
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