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Su Jung An, Hee Seo, Chaehun Lee, Seong-Kyu Ahn, Se-Hwan Park, Jeong-Hoe Ku
The PRIDE (PyRoprocessing Integrated inactive DEmonstration) is an engineering-scale pyroprocessing test-bed facility that utilizes depleted uranium (DU) instead of spent fuel as a process material. As part of the ongoing effort to enhance pyroprocessing safeguardability, UNDA (Unified Non-Destructive Assay), a system integrating three different non-destructive assay techniques, namely, neutron, gamma-ray, and mass measurement, for nuclear material accountancy (NMA) was developed. In the present study, UNDA's NMA capability was evaluated by measurement of the weight, (238)U mass, and U enrichment of oxide-reduction-process feed material (i...
December 30, 2016: Applied Radiation and Isotopes
Ana Rahma Yuniarti, Ki Moo Lim
BACKGROUND AND AIMS: The existence of non-excitable cells in the myocardium leads to the increasing conduction non-uniformity and decreasing myocardial electrical conductivity. Slowed myocardial conduction velocity (MCV) believed to enhance the probability of cardiac arryhthmia and alter the cardiac mechanical pumping efficacy, even in sinus rhythm. Though several studies on the correlation between MCV and cardiac electrical instabilities exist, there has been no study concerning correlation or causality between MCV and cardiac mechanical pumping efficacy, due to the limitation in clinical methods to document and evaluate cardiac mechanical responses directly...
January 10, 2017: Biomedical Engineering Online
Po-Hao Wang, Vijay Raj Singh, Jau-Min Wong, Kung-Bin Sung, Yuan Luo
Confocal imaging techniques offer an optical sectioning capability to acquire three-dimensional information from various volumetric samples by discriminating the desired in-focus signals from the out-of-focus background. However, confocal, in general, requires a point-by-point scan in both the lateral and axial directions to reconstruct three-dimensional images. In addition, axial scanning in confocal is slower than scanning in lateral directions. In this Letter, a non-axial-scanning multifocal confocal microscope incorporating multiplexed holographic gratings in illumination and dual detection for depth discrimination is presented...
January 15, 2017: Optics Letters
Jing Wang, Huatao Wang, Wenying Zhang, Xinyi Yang, Guangwu Wen, Yijie Wang, Weiwei Zhou
Titanium (Ti) and its alloys are widely applied in many high strength, light weight applications, but their thermal conductivity is lower compared to that of other metals, which limits their further applications. In this paper, we demonstrated experimentally that rGO-Ti-rGO heterogeneous substrates with higher thermal conductivity, up to ∼38.8% higher than Ti, could be fabricated by electrochemical depositing rGO on their surface. The rGO layers are grown on the surface of Ti substrates, with appearance of bedclothes on the beds...
January 12, 2017: Nanotechnology
Ran Niu, Erdal C Oğuz, Hannah Müller, Alexander Reinmüller, Denis Botin, Hartmut Löwen, Thomas Palberg
We assemble charged colloidal spheres at deliberately chosen locations on a charged unstructured glass substrate utilizing ion exchange based electro-osmotic micro-pumps. Using microscopy, a simple scaling theory and Brownian dynamics computer simulations, we systematically explore the control parameters of crystal assembly and the mechanisms through which they depend on the experimental boundary conditions. We demonstrate that crystal quality depends crucially on the assembly distance of the colloids. This is understood as resulting from the competition between inward transport by the electro-osmotic pump flow and the electro-phoretic outward motion of the colloids...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
Guo-Ning Chen, Ning Li, Tian Luo, Yu-Ming Dong
In this study, 3-(trimethoxysilyl)propyl methacrylate (γ-MPS), a bifunctional group compound, was used as a single cross-linking agent to prepare molecular imprinted inorganic-organic hybrid polymers by in situ polymerization for open-tubular capillary electro chromatography (CEC) column. The optimal preparation conditions were: the ratio between template molecule and functional monomer was 1:4; the volume proportion of porogen toluene and methanol was 1:1 and the volume of cross-linking agent γ-MPS was 69 μL...
January 10, 2017: Journal of Chromatographic Science
Vahid Samaeeaghmiyoni, Hosni Idrissi, Jonas Groten, Ruth Schwaiger, Dominique Schryvers
Twin-jet electro-polishing and Focused Ion Beam (FIB) were combined to produce small size Nickel single crystal specimens for quantitative in-situ nanotensile experiments in the transmission electron microscope. The combination of these techniques allows producing samples with nearly defect-free zones in the centre in contrast to conventional FIB-prepared samples. Since TEM investigations can be performed on the electro-polished samples prior to in-situ TEM straining, specimens with desired crystallographic orientation and initial microstructure can be prepared...
December 21, 2016: Micron: the International Research and Review Journal for Microscopy
Jacqueline Findlay, Katie L Hopkins, Adela Alvarez-Buylla, Daniéle Meunier, Nazim Mustafa, Robert Hill, Rachel Pike, Li-Xu McCrae, Peter M Hawkey, Neil Woodford
OBJECTIVES: Carbapenemase-producing Enterobacteriaceae (CPE) have been increasingly reported in the UK since 2003. We analysed patient and isolate data for CPE confirmed by the national reference laboratory from laboratories in the West Midlands region from November 2007 to December 2014. METHODS: MICs were determined by BSAC agar dilution methodology and isolates exhibiting resistance to one or more carbapenems were screened for carbapenemase genes by PCR. Plasmid analyses were performed after electro-transformation of carbapenemase-encoding plasmids...
January 10, 2017: Journal of Antimicrobial Chemotherapy
Ricky Padilla-Del Valle, Luis R Morales-Vale, Carlos Ríos-Velázquez
In Puerto Rico, the microbial diversity of the thermal spring (ThS) in Coamo has never been studied using metagenomics. The focus of our research was to generate a metagenomic library from the ThS of Coamo, Puerto Rico and explore the microbial and functional diversity. The metagenomic library from the ThS waters was generated using direct DNA isolation. High molecular weight (40 kbp) DNA was end-repaired, electro eluted and ligated into a fosmid vector (pCCFOS1); then transduced into Escherichia coli EPI300-T1R using T1 bacteriophages...
March 2017: Genomics Data
Zhe Wei, Yan Wang, Weijiang Zhao, Melitta Schachner
Spinal cord injury is a devastating neurological disease in desperate need of a cure. We have previously shown that overexpression of the adhesion molecule L1 contributes to locomotor recovery after injury and were therefore interested in how electro-acupuncture would influence the expression of this molecule. Here, we investigated the effects of electro-acupuncture at "Jiaji" points (EX-B2), newly established by us, in young adult mice to determine whether improved recovery via electro-acupuncture could be due to enhanced L1 expression...
January 9, 2017: American Journal of Chinese Medicine
Xiu Wang, Fatang Tan, Wei Wang, Xueliang Qiao, Xiaolin Qiu, Jianguo Chen
In this paper, a facile process was developed for anchoring of silver nanoparticles on graphitic carbon nitride sheets (Ag/g-C3N4) with high catalytic activity for reduction of 4-nitrophenol. The morphology and structure of the as-prepared Ag/g-C3N4 composite were investigated by FESEM, TEM, XRD and XPS. The reaction mechanism and the reduction kinetics of 4-nitrophenol under different light irradiation were systematically studied. The results showed that the obtained Ag/g-C3N4 composite exhibited a much higher electro/photo catalytic activity and stability for reduction of 4-nitrophenol...
December 22, 2016: Chemosphere
Cheng Tang, Qiang Zhang
The oxygen reduction reaction (ORR) is the cornerstone of various sustainable energy-conversion technologies. Metal-free nanocarbon electrocatalysts with competitive activity, enhanced durability, and satisfactory cost, have been proposed as the most promising substitute for precious-metal catalysts. However, their further development is still primarily based on trial-and-error approaches due to the controversial knowledge of critical active sites and mechanisms. Herein, the activity origins of nanocarbon-based ORR electro-catalysts are comprehensively reviewed and correlated, considering the dopants, edges, and defects...
January 9, 2017: Advanced Materials
Thi Xuan Huong Le, Thi Van Nguyen, Zoulkifli Amadou Yacouba, Laetitia Zoungrana, Florent Avril, Duy Linh Nguyen, Eddy Petit, Julie Mendret, Valerie Bonniol, Mikhael Bechelany, Stella Lacour, Geoffroy Lesage, Marc Cretin
The evolution of the degradation by-products of an acetaminophen (ACE) solution was monitored by HPLC-UV/MS and IC in parallel with its ecotoxicity (Vibrio fischeri 81.9%, Microtox(®) screening tests) during electro-Fenton (EF) oxidation performed on carbon felt. The aromatic compounds 2-hydroxy-4-(N-acetyl) aminophenol, 1,4-benzoquinone, benzaldehyde and benzoic acid were identified as toxic sub-products during the first stage of the electrochemical treatment, whereas aliphatic short-chain carboxylic acids (oxalic, maleic, oxamic, formic, acetic and fumaric acids) and inorganic ions (ammonium and nitrate) were well identified as non-toxic terminal sub-products...
December 21, 2016: Chemosphere
Martina Romio, Camillo La Mesa
Multi-walled carbon nanotubes, MWCNTs, are stabilized thanks to the surface wrapping of single-strand DNA, ss-DNA; the resulting adducts are kinetically and thermodynamically stable Such entities build up nano-hybrids with titania, TiO2, nano-particles, in presence of surfactant as an adjuvant. The conditions leading to TiO2 adsorption onto ss-DNA/CNTs were investigated, by optimizing the concentration of adducts, nano-particles (NPs), and of the cationic surfactant (CTAB). Controlling the working conditions makes possible to get homogeneously organized hybrids...
December 24, 2016: Colloids and Surfaces. B, Biointerfaces
Shabbir Muhammad, Abdullah G Al-Sehemi, Zhongmin Su, Hongliang Xu, Ahmad Irfan, Aijaz Rasool Chaudhry
Using first-principle methods, several key electronic, optical and nonlinear optical properties are calculated for two recently synthesized chalcone derivatives i.e. (2E)-3-(4-methylphenyl)-1-(3-nitrophenyl)prop-2-en-1-one (comp.1) and (2E)-3-[4-(dimethylamino)phenyl]-1-(3-nitrophenyl)prop-2-en-1-one (comp.2). The calculation of dipole moment, polarizability <α>, anisotropy of polarizability as well as second hyperpolarizability (usually considered as a signature for two photon absorption phenomenon) are performed using density functional theory methods at PBE0/6-311G** level of theory...
December 14, 2016: Journal of Molecular Graphics & Modelling
Gleb P Tolstykh, Melissa Tarango, Caleb C Roth, Bennett L Ibey
Previously, it was demonstrated that nanometer-sized pores (nanopores) are formed in outer cellular membranes after exposure to nanosecond electric pulses (nsEPs). We reported that plasma membrane nanoporation affects phospholipids of the cell membrane, culminating in cascading phosphoinositide phosphatidylinositol-4,5-bisphosphate (PIP2) intracellular signaling. In the current study, we show that nsEPs initiated electric field (EF) dose-dependent PIP2 hydrolysis and/or depletion from the plasma membrane. This process was confirmed using fluorescent optical probes of PIP2 hydrolysis: PLCδ-PH-EGFP and GFP-C1-PKCγ-C1a...
January 5, 2017: Biochimica et Biophysica Acta
U Hollenstein, H Schmutz, J A Agner, M Sommavilla, F Merkt
Frequency-modulation (FM) spectroscopy has been extended to the vacuum-ultraviolet (VUV) range of the electromagnetic spectrum. Coherent VUV laser radiation is produced by resonance-enhanced sum-frequency mixing (νVUV=2νUV+ν2) in Kr and Xe using two near-Fourier-transform-limited laser pulses of frequencies νUV and ν2. Sidebands generated in the output of the second laser (ν2) using an electro-optical modulator operating at the frequency νmod are directly transferred to the VUV and used to record FM spectra...
January 7, 2017: Journal of Chemical Physics
Hamdi Ezzin, Morched Ben Amor, Mohamed Hédi Ben Ghozlen
A dynamic solution is presented for the propagation of harmonic waves in magneto-electro-elastic plates composed of piezoelectric BaTiO3(B) and magnetostrictive CoFe2O4(F) material. The state-vector approach is employed to derive the propagator matrix which connects the field variables at the upper interface to those at the lower interface of each layer. The ordinary differential approach is employed to determine the wave propagating characteristics in the plate by imposing the traction-free boundary condition on the top and bottom surfaces of the layered plate...
December 26, 2016: Ultrasonics
Yi Shen, Bin Gong, Kaijun Xiao, Lei Wang
One-dimensional (1D) anisotropic Pt-based nanowires are promising electrocatalysts in polymer electrolyte membrane fuel cells owing to the inherent structural merits. Herein, we report an in-situ growth of ultrathin PtRh nanowires (diameters 2~3 nm) on graphene nanosheets via the oriented attachment pathway. Mechanistic studies reveal that graphene nanosheets play a critical role in the nucleation and growth of PtRh nanowires. The resulting hybrid of PtRh nanowires decorated graphene nanosheets shows outstanding activity and durability toward ethanol electro-oxidation...
January 6, 2017: ACS Applied Materials & Interfaces
V Sorianello, G De Angelis, T Cassese, M Midrio, M Romagnoli, M Moshin, M Otto, D Neumaier, I Asselberghs, J Van Campenhout, C Huyghebaert
We report for the first time and characterize experimentally the complex optical conductivity of graphene on silicon photonic waveguides. This permits us to predict accurately the behavior of photonic integrated devices encompassing graphene layers. Exploiting a Si microring add/drop resonator, we show the effect of electrical gating of graphene on the complex effective index of the waveguide by measuring both the wavelength shift of the resonance and the change in the drop peak transmission. Due to electro-refractive effect of graphene a giant (>10<sup>-3</sup>) change in the effective index is demonstrated for the first time on Si photonics waveguides and this large effect will crucially impact performances and consumption of Si photonics devices...
December 26, 2016: Optics Express
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