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https://www.readbyqxmd.com/read/27921097/stabilizing-the-cubic-perovskite-phase-of-cspbi3-nanocrystals-by-using-an-alkyl-phosphinic-acid
#1
Chujie Wang, Anthony S R Chesman, Jacek J Jasieniak
CsPbI3 nanocrystals suffer from a facile cubic perovskite to orthorhombic phase transformation, which deteriorates their appealing optoelectronic properties. Here, we report a new colloidal synthesis that replaces the conventionally used oleic acid with an alkyl phosphinic acid to grow high-quality, phase-stable cubic perovskite CsPbI3 nanocrystals.
December 6, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27918298/-h3o-3sb2br9-the-first-member-of-the-m3e2x9-structure-family-with-oxonium-cations
#2
Jen Hui Chang, Thomas Doert, Michael Ruck
(H3O)3Sb2Br9 [trihydroxonium enneabromidodiantimonate(III)] is the first representative of the M3E2X9 family (M = cation, E = Sb and Bi, and X = Br and I) with oxonium cations. The metastable compound was obtained in trace amounts from a solution of CsBr and SbBr3 in concentrated aqueous HBr. Single crystals were isolated from the mother liquor and investigated by single-crystal X-ray diffraction at 100 K. (H3O)3Sb2Br9 crystallizes with the Tl3Bi2I9 structure type, which is a distorted defect variant of cubic perovskite...
December 1, 2016: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/27916944/trend-residual-dual-modeling-for-detection-of-outliers-in-low-cost-gps-trajectories
#3
Xiaojian Chen, Tingting Cui, Jianhong Fu, Jianwei Peng, Jie Shan
Low-cost GPS (receiver) has become a ubiquitous and integral part of our daily life. Despite noticeable advantages such as being cheap, small, light, and easy to use, its limited positioning accuracy devalues and hampers its wide applications for reliable mapping and analysis. Two conventional techniques to remove outliers in a GPS trajectory are thresholding and Kalman-based methods, which are difficult in selecting appropriate thresholds and modeling the trajectories. Moreover, they are insensitive to medium and small outliers, especially for low-sample-rate trajectories...
December 1, 2016: Sensors
https://www.readbyqxmd.com/read/27916692/the-effects-of-bacteria-nanoparticles-interface-on-the-antibacterial-activity-of-green-synthesized-silver-nanoparticles
#4
Aftab Ahmad, Yun Wei, Fatima Syed, Kamran Tahir, Aziz Ur Rehman, Arifullah Khan, Sadeeq Ullah, Qipeng Yuan
Neutralization of bacterial cell surface potential using nanoscale materials is an effective strategy to alter membrane permeability, cytoplasmic leakage, and ultimate cell death. In the present study, an attempt was made to prepare biogenic silver nanoparticles using biomolecules from the aqueous rhizome extract of Coptis Chinensis. The biosynthesized silver nanoparticles were surface modified with chitosan biopolymer. The prepared silver nanoparticles and chitosan modified silver nanoparticles were cubic crystalline structures (XRD) with an average particle size of 15 and 20 nm respectively (TEM, DLS)...
December 1, 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27914376/mode-converted-ultrasonic-scattering-in-polycrystals-with-elongated-grains
#5
Andrea P Arguelles, Christopher M Kube, Ping Hu, Joseph A Turner
Elastic wave scattering is used to study polycrystalline media for a wide range of applications. Received signals, which include scattering from the randomly oriented grains comprising the polycrystal, contain information from which useful microstructural parameters may often be inferred. Recently, a mode-converted diffuse ultrasonic scattering model was developed for evaluating the scattered response of a transverse wave from an incident longitudinal wave in a polycrystalline medium containing equiaxed single-phase grains with cubic elastic symmetry...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27910835/two-cubic-phases-in-kimzeyite-garnet-from-the-type-locality-magnet-cove-arkansas
#6
Sytle M Antao, Laura A Cruickshank
The crystal structure of an optically anisotropic kimzeyite garnet from Magnet Cove, Arkansas, USA, where it was first discovered, was refined with the Rietveld method, cubic space group, Ia\overline 3 d, and monochromatic [λ = 0.41422 (2) Å] synchrotron high-resolution powder X-ray diffraction (HRPXRD) data. The Rietveld refinement reduced χ(2) and overall R(F(2)) values are 1.840 and 0.0647, respectively. The sample, with the general garnet formula ([8])X3([6])Y2([4])Z3([4])O12, contains an intergrowth of two cubic phases that occur initially as oscillatory growth zoning, and patchy intergrowths arise later from fluid-enhanced dissolution and re-precipitation...
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27910181/trends-and-risk-factors-of-stillbirths-and-neonatal-deaths-in-eastern-uganda-1982-2011-a-cross-sectional-population-based-study
#7
Sanni Kujala, Peter Waiswa, Daniel Kadobera, Joseph Akuze, George Pariyo, Claudia Hanson
OBJECTIVES: To identify mortality trends and risk factors associated with stillbirths and neonatal deaths 1982-2011. METHODS: Population-based cross-sectional study based on reported pregnancy history in Iganga-Mayuge Health and Demographic Surveillance Site (HDSS) in Uganda. A pregnancy history survey was conducted among women aged 15-49 years living in the HDSS during May-July 2011 (n = 10 540). Time trends were analysed with cubic splines and linear regression...
November 5, 2016: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/27909841/the-shaping-of-intrinsic-membrane-potential-oscillations-positive-negative-feedback-ionic-resonance-amplification-nonlinearities-and-time-scales
#8
Horacio G Rotstein
The generation of intrinsic subthreshold (membrane potential) oscillations (STOs) in neuronal models requires the interaction between two processes: a relatively fast positive feedback that favors changes in voltage and a slower negative feedback that opposes these changes. These are provided by the so-called resonant and amplifying gating variables associated to the participating ionic currents. We investigate both the biophysical and dynamic mechanisms of generation of STOs and how their attributes (frequency and amplitude) depend on the model parameters for biophysical (conductance-based) models having qualitatively different types of resonant currents (activating and inactivating) and an amplifying current...
December 1, 2016: Journal of Computational Neuroscience
https://www.readbyqxmd.com/read/27909337/optimization-of-the-optical-transparency-of-rodent-tissues-by-modified-pact-based-passive-clearing
#9
Jiwon Woo, Mirae Lee, Jeong Min Seo, Hyo Suk Park, Yong Eun Cho
Recently, a bio-electrochemical technique known as CLARITY was reported for three-dimensional phenotype mapping within transparent tissues, allowing clearer whole-body and organ visualization with CB-perfusion (CUBIC) and leading to the development of whole-body clearing and transparency of intact tissues with the PACT (passive clarity technique) and PARS (perfusion-assisted agent release in situ) methodologies. We evaluated the structure-function relationships in circuits of the whole central nervous system (CNS) and various internal organs using improved methods with optimized passive clarity...
December 2, 2016: Experimental & Molecular Medicine
https://www.readbyqxmd.com/read/27909305/j-curve-relation-between-daytime-nap-duration-and-type-2-diabetes-or-metabolic-syndrome-a-dose-response-meta-analysis
#10
Tomohide Yamada, Nobuhiro Shojima, Toshimasa Yamauchi, Takashi Kadowaki
Adequate sleep is important for good health, but it is not always easy to achieve because of social factors. Daytime napping is widely prevalent around the world. We performed a meta-analysis to investigate the association between napping (or excessive daytime sleepiness: EDS) and the risk of type 2 diabetes or metabolic syndrome, and to quantify the potential dose-response relation using cubic spline models. Electronic databases were searched for articles published up to 2016, with 288,883 Asian and Western subjects...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27908092/the-effect-of-cubic-material-nonlinearity-on-the-propagation-of-torsional-wave-modes-in-a-pipe
#11
Yanzheng Wang, Jan D Achenbach
The effect of cubic material nonlinearity on the propagation in a pipe of the lowest axially symmetric torsional wave mode has been investigated in this paper. Two cases, one that the material of the whole pipe is nonlinear, and the second that a small segment of the pipe is nonlinear, have been considered. For the first case, a first and a third harmonic have been obtained by the perturbation method. Analytical expressions for the two cumulative harmonics have been derived. The second case leads to a scattering problem...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27908063/simulation-study-of-axial-ultrasonic-wave-propagation-in-heterogeneous-bovine-cortical-bone
#12
Toshiho Hata, Yoshiki Nagatani, Koki Takano, Mami Matsukawa
The effect of the heterogeneity of the long cortical bone is an important factor when applying the axial transmission technique. In this study, the axial longitudinal wave velocity distributions in specimens from the mid-shaft of a bovine femur were measured, in the MHz range. Bilinear interpolation and the piecewise cubic Hermite interpolating polynomial method were used to construct three-dimensional (3D) axial velocity models with a resolution of 40 μm. By assuming the uniaxial anisotropy of the bone and using the results of previous experimental studies [Yamato, Matsukawa, Yanagitani, Yamazaki, Mizukawa, and Nagano (2008b)...
November 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27908012/pt-symmetric-couplers-with-competing-cubic-quintic-nonlinearities
#13
Gennadiy Burlak, Salomon Garcia-Paredes, Boris A Malomed
We introduce a one-dimensional model of the parity-time ( PT)-symmetric coupler, with mutually balanced linear gain and loss acting in the two cores, and nonlinearity represented by the combination of self-focusing cubic and defocusing quintic terms in each core. The system may be realized in optical waveguides, in the spatial and temporal domains alike. Stationary solutions for PT-symmetric solitons in the systems are tantamount to their counterparts in the ordinary coupler with the cubic-quintic nonlinearity, where the spontaneous symmetry breaking of solitons is accounted for by bifurcation loops...
November 2016: Chaos
https://www.readbyqxmd.com/read/27906474/tuning-the-energy-transfer-efficiency-between-ce-3-and-ln-3-ions-ln-tm-sm-tb-dy-by-controlling-the-crystal-phase-of-nayf4-nanocrystals
#14
Venkata N K B Adusumalli, Heramba V S R M Koppisetti, Sagar Ganguli, Shyam Sarkar, Venkataramanan Mahalingam
NaYF4 is a superior host matrix to study the luminescence properties of lanthanide (Ln(3+) ) ions. Ln(3+) ions in hexagonal-phase NaYF4 (β-phase) nanocrystals (NCs) exhibit strong luminescence via an upconversion process compared to cubic NaYF4 (α-phase) NCs. However, in Ce(3+) /Ln(3+) -doped NaYF4 NCs (Ln=Tm, Tb, Sm, Dy) the α-phase NaYF4 NCs shows strong luminescence compared to their counterpart β-phase NCs despite the latter being much larger in size. This is attributed to comparatively large overlap between Ce(3+) ions emission band with excited energy levels of those Ln(3+) ions in α-phase compared to β-phase NCs...
December 1, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27906145/nitrobacter-sp-extract-mediated-biosynthesis-of-ag2o-nps-with-excellent-antioxidant-and-antibacterial-potential-for-biomedical-application
#15
Gopalu Karunakaran, Matheswaran Jagathambal, Alexander Gusev, Nguyen Van Minh, Evgeny Kolesnikov, Arup Ratan Mandal, Denis Kuznetsov
In this study, extracellular extract of plant growth promoting bacterium, Nitrobacter sp. is used for the bioconversion of AgNO3 (silver nitrate) into Ag2O (silver oxide nanoparticles). It is an easy, ecofriendly and single step method for Ag2O NPs synthesis. The bio-synthesized nanoparticles were characterized using different techniques. UV-Vis results showed the maximum absorbance around 450 nm. XRD result shows the particles to have faced centered cubic (fcc) crystalline nature. FTIR analysis reveals the functional groups that are involved in bioconversion such as C-N, N-H and C=O...
December 2016: IET Nanobiotechnology
https://www.readbyqxmd.com/read/27906143/microemulsion-synthesis-of-silver-nanoparticles-using-biosurfactant-extracted-from-pseudomonas-aeruginosa-mkvit3-strain-and-comparison-of-their-antimicrobial-and-cytotoxic-activities
#16
Moonjit Das, Kaustuvmani Patowary, Radhakrishnan Vidya, Himaja Malipeddi
In the present study, an efficient biosurfactant producing bacterial strain Pseudomonas aeruginosa MKVIT3 was isolated from an oil logging area in Vellore district of Tamil Nadu, India. Liquid chromatography-mass spectrometry (LC-MS/MS) analysis was performed for the identification of different congeners present in the extracted biosurfactant. The column purified biosurfactant was used to stabilise the formation of silver nanoparticles (NP) using borohydrate reduction in reverse micelles. The silver NP were characterised using UV-vis absorption spectroscopy, Powder-XRD TEM analysis and zeta potential...
December 2016: IET Nanobiotechnology
https://www.readbyqxmd.com/read/27901606/protein-folding-prediction-in-a-cubic-lattice-in-hydrophobic-polar-model
#17
Nicola Yanev, Metodi Traykov, Peter Milanov, Borislav Yurukov
The tertiary structure of the proteins determines their functions. Therefore, the predicting of protein's tertiary structure, based on the primary amino acid sequence from long time, is the most important and challenging subject in biochemistry, molecular biology, and biophysics. One of the most popular protein structure prediction methods, called Hydrophobic-Polar (HP) model, is based on the observation that in polar environment hydrophobic amino acids are in the core of the molecule-in contact between them and more polar amino acids are in contact with the polar environment...
November 30, 2016: Journal of Computational Biology: a Journal of Computational Molecular Cell Biology
https://www.readbyqxmd.com/read/27901150/correlation-of-dielectric-electrical-and-magnetic-properties-near-the-magnetic-phase-transition-temperature-of-cobalt-zinc-ferrite
#18
Dhiren K Pradhan, Shalini Kumari, Venkata S Puli, Proloy T Das, Dillip K Pradhan, Ashok Kumar, J F Scott, Ram S Katiyar
Multiferroic composite structures, i.e., composites of magnetostrictive and piezoelectric materials, can be envisioned to achieve the goal of strong room-temperature ME coupling for real practical device applications. Magnetic materials with high magnetostriction, high Néel temperature (TN), high resistivity and large magnetization are required to observe high ME coupling in composite structures. In continuation of our investigations on suitable magnetic candidates for multiferroic composite structures, we have studied the crystal structure, dielectric, transport, and magnetic properties of Co0...
November 30, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27901099/post-perovskite-transition-in-anti-structure
#19
Bosen Wang, Kenya Ohgushi
The discovery of the post-perovskite transition, which is the structural transition from the perovskite to post-perovskite structure in MgSiO3 under pressure, has aroused great interests in geosciences. Despite of previous extensive studies, key factors of the post-perovsktie transition are still under hot debate primarily due to the big difficulty in performing systematic experiments under extreme conditions. Hence, search for new materials showing the post-perovskite transition under ambient pressure has been highly expected...
November 30, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27899938/detailed-analysis-of-the-impact-of-age-on-the-qt-interval
#20
Simon W Rabkin, Xin-Bo Justin Cheng, Darby Js Thompson
OBJECTIVE: To analyze the effect of age on the ECG QT interval, an important predictor of cardiovascular mortality and drug-induced cardiac arrhythmias, and determine whether QT-heart rate correction formulae (QTc) have differential relationships with age and sex. METHODS: Data were examined from the US National Health and Nutrition Examination Survey (NHANES) II and III, civilian population aged 25 to 90 years. QT weighted means and standard deviations were calculated for all ages...
September 2016: Journal of Geriatric Cardiology: JGC
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