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Dragolici, Cristian A., E-mail: adrag@nipne.ro2014
AbstractAbstract
[en] Small angle scattering (SAS) is the collective name given to the techniques of small angle neutron (SANS) and X-ray (SAXS) scattering. They offer the possibility to analyze particles without disturbing their natural environment. In each of these techniques radiation is elastically scattered by a sample and the resulting scattering pattern is analyzed to provide information about the size, shape and orientation of some component of the sample. Accordingly, a large number of methods and experimental patterns have been developed to ease the investigation of condensed matter by use of these techniques. Some of them are the discussed in this paper
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TIM-13 Physics Conference; Timisoara (Romania); 21-24 Nov 2013; (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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Oranskaya, A. A.; Pomogaeva, A. V.; Timoshkin, A. Y., E-mail: kaleidosckop@gmail.com, E-mail: avpomogaeva@cc.spbu.ru, E-mail: timoshkn@gmail.com2015
AbstractAbstract
[en] Theoretical investigation of structural and electronic properties is presented for the rod-like oligomers R3-[MRNH]3n-H3 and [RMNH]n+1 (M=Ga,Al,In R=H,CH3) of different lengths. Electronic structures of the oligomers with and without substitutions of Ga atoms with Al or In were studied at DFT level of theory. Clusters up to 8 nm of length were considered. A type of terminal groups of the oligomers is found to have a dominant influence on their electronic properties
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APMAS 2014: 4. International Congress in Advances in Applied Physics and Materials Science; Fethiye (Turkey); 24-27 Apr 2014; (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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[en] Small-angle neutron scattering (SANS) measurements on 0.3M sodium dodecyl sulfate (SDS) micellar solutions have been performed in the presence of n-alcohols, from ethanol to decanol at different alcohol concentrations, 2–10 wt%. The ellipsoid micellar structure which occurred in the 0.3M SDS in aqueous solution with the size range of 30–50 Å has different behavior at various hydrocarbon chain length and concentration of alcohols. At low concentration and short chain-length of alcohols, such as ethanol, propanol, and butanol, the size of micelles reduced and had a spherical-like structure. The opposite effect occurred as medium to long chain alcohols, such as hexanol, octanol and decanol was added into the 0.3M SDS micellar solutions. The micelles structure changed to be more elongated in major axis and then crossed the critical phase transition from micellar solution into liquid crystal phase as lamellar structure emerged by further addition of alcohols. The inter-lamellar distances were also depending on the hydrocarbon chain length and concentration of alcohols. In the meantime, the persistent micellar structures occurred in addition of medium chain of n-alcohol, pentanol at all concentrations
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APS 2012: 5. Asian Physics Symposium; Bandung (Indonesia); 10-12 Jul 2012; (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
[en] Atmospheric pressure non-thermal dielectric barrier discharges can be generated in different configurations for different applications. For sterilization, a parallel-plate electrode configuration with glass dielectric that discharges in air was used. Gram-negative bacteria (Escherichia coli and Salmonella enteritidis) and Gram-positive bacteria (Bacillus cereus) were successfully inactivated using sinusoidal high voltage of ∼15 kVp-p at 8.5 kHz. In the surface treatment, a hemisphere and disc electrode arrangement that allowed a plasma jet to be extruded under controlled nitrogen gas flow (at 9.2 kHz, 20 kVp-p) was applied to enhance the wettability of PET (Mylar) film
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PERFIK 2014: National Physics Conference 2014; Kuala Lumpur (Malaysia); 18-19 Nov 2014; (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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[en] Polymer films of Poly(vinylalcohol) (PVA) complexed with Polyethylene glycol (PEG) with different dopant concentrations of Cr3+ ions are prepared by solution cast technique. Electron paramagnetic resonance (EPR), Optical absorption and FT-IR studies have been carried out on the polymer films. The EPR spectra of the entire samples exhibit resonance signal at g ≈1.97 which is attributed to the isolated Cr3+ pairs. The temperature variation EPR studies show that the population of spin-levels participating in the resonance decreases with an increase in temperature, which is in accordance with the Boltzmann Law. The paramagnetic susceptibilities (X) have been calculated from the EPR data at different temperatures. The linewidth of the g ≈1.97 resonance signal has been found to be decreasing with an increase in temperature, which confirms the pairing mechanism between Cr3+ ions. The Optical absorption spectrum of chromium ions in (PVA+PEG) polymer films exhibits three bands, corresponding to the d-d transitions 4A2g(F)→4T1g(F), 4A2g(F)→4T2g(F) and 4A2g(F)→2T1g(G), in the order of decreasing energy. The crystal field parameter Dq and the Racah interelectronic repulsion parameters B and C have been evaluated. From the ultraviolet absorption edges, Optical band gap (Eopt) and Urbach (ΔE) energies are evaluated. FT-IR spectrum exhibits few bands which are attributed to O-H, CH, C=C and C=O groups of stretching and bending vibrations
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ICCMP 2014: International Conference on Condensed Matter Physics 2014; Shimla (India); 4-6 Nov 2014; (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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ALCOHOLS, ANGULAR MOMENTUM, CHARGED PARTICLES, DEFORMATION, DIMENSIONLESS NUMBERS, ELECTROMAGNETIC RADIATION, GLYCOLS, HYDROXY COMPOUNDS, INTEGRAL TRANSFORMATIONS, IONS, MAGNETIC RESONANCE, MAGNETISM, MATERIALS, ORGANIC COMPOUNDS, ORGANIC POLYMERS, PARTICLE PROPERTIES, POLYMERS, POLYVINYLS, RADIATIONS, RESONANCE, SPECTRA, TRANSFORMATIONS
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AbstractAbstract
[en] The recombination dynamics of InxGa1−xN single quantum wells are investigated. By comparing the photoluminescence (PL) decay spectra with simulated emission spectra obtained by a Schrödinger-Poisson approach, we give evidence that recombination from higher subbands contributes the emission of the quantum well at high excitation densities. This recombination path appears as a shoulder on the high energy side of the spectrum at high charge carrier densities and exhibits decay in the range of ps. Due to the lower confinement of the excited subband states, a distinct proportion of the probability density function lies outside the quantum well, thus contributing to charge carrier loss. By estimating the current density in our time resolved PL experiments, we show that the onset of this loss mechanism occurs in the droop relevant regime above 20 A/cm2
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(c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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[en] In this report, the modulation of current gain of InGaP/GaAs light-emitting transistors under different ambient temperatures are measured and analyzed using thermionic emission model of quantum well embedded in the transistor base region. Minority carriers captured by quantum wells gain more energy at high temperatures and escape from quantum wells resulting in an increase of current gain and lower optical output, resulting in different I-V characteristics from conventional heterojunction bipolar transistors. The effect of the smaller thermionic lifetime thus reduces the effective base transit time of transistors at high temperatures. The unique current gain enhancement of 27.61% is achieved when operation temperature increase from 28 to 85 °C
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(c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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Yamada, Toyo Kazu; Vazquez de Parga, Amadeo L., E-mail: toyoyamada@faculty.chiba-u.jp2014
AbstractAbstract
[en] Antiferromagnets produce no stray field, and therefore, a tip electrode made of antiferromagnetic material has been considered to be the most suitable choice to measure such as magnetoresistance (MR) through single isolated magnetic nanoparticles, molecules, and ultrathin films. Spin polarizations (P) of antiferromagnetic 3-nm, 6-nm, and annealed 3-nm Mn films grown on W tips with a bcc(110) apex as well as bulk-NiMn tips were obtained at 300 K by measuring MR in ultrahigh vacuum by means of spin-polarized scanning tunneling microscopy using a layerwise antiferromagnetically stacking bct-Mn(001) film electrode. The Mn-coated tips with coverages of 3 and 6 nm exhibited P values of 1 ± 1% and 3 ± 2%, respectively, which tips likely contain α- or strained Mn. With a thermal assist, the crystalline quality and the magnetic stability of the film could increase. The annealed tip exhibited P = 9 ± 2%. The bulk-NiMn tips exhibit spin polarizations of 0 or 6 ± 2% probably depending on the chemical species (Mn or Ni) present at the apex of the tip. Fe-coated W tips were used to estimate the bct-Mn(001) film spin polarization
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(c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
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CRYSTAL LATTICES, CRYSTAL STRUCTURE, CUBIC LATTICES, ELECTRIC CONDUCTIVITY, ELECTRICAL PROPERTIES, ELEMENTS, MAGNETIC MATERIALS, MAGNETISM, MATERIALS, METALS, MICROSCOPY, NONMETALS, ORIENTATION, PARTICLES, PHYSICAL PROPERTIES, REFRACTORY METALS, TEMPERATURE RANGE, THREE-DIMENSIONAL LATTICES, TRANSITION ELEMENTS
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Giant increase of critical current density and vortex pinning in Mn doped KxFe2−ySe2 single crystals
Li, Mingtao; Zhang, Jincang; Chen, La; You, Wen-Long; Ge, Junyi, E-mail: jczhang@staff.shu.edu.cn2014
AbstractAbstract
[en] We report a comparative study of the critical current density (Jc) and vortex pinning among pure and Mn doped KxFe2−ySe2 single crystals. It is found that the Jc values can be greatly improved by Mn doping and post-quenching treatment when comparing to pristine pure sample. In contrast to pure samples, an anomalous second magnetization peak (SMP) effect is observed in both 1% and 2% Mn doped samples at T = 3 K for H∥ab but not for H∥c. Referring to Dew-Hughes and Kramer's model, we performed scaling analyses of the vortex pinning force density vs magnetic field in 1% Mn doped and quenched pristine crystals. The results show that the normal point defects are the dominant pinning sources, which probably originate from the variations of intercalated K atoms. We propose that the large nonsuperconducting K-Mn-Se inclusions may contribute to the partial normal surface pinning and give rise to the anomalous SMP effect for H∥ab in Mn doped crystals. These results may facilitate further understanding of the superconductivity and vortex pinning in intercalated iron-selenides superconductors
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(c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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ALKALI METALS, CHALCOGENIDES, CRYSTAL DEFECTS, CRYSTAL STRUCTURE, CRYSTALS, CURRENTS, ELECTRIC CONDUCTIVITY, ELECTRIC CURRENTS, ELECTRICAL PROPERTIES, ELEMENTS, IRON COMPOUNDS, MATERIALS, METALS, PHYSICAL PROPERTIES, SELENIDES, SELENIUM COMPOUNDS, SEMIMETALS, TEMPERATURE RANGE, TRANSITION ELEMENT COMPOUNDS, TRANSITION ELEMENTS
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Yamamoto, Takashi; Mizoguchi, Teruyasu, E-mail: teru@iis.u-tokyo.ac.jp2014
AbstractAbstract
[en] We investigated the migration energy and vacancy formation energy of La and Sr ions at a LaAlO3/SrTiO3 heterointerface using first-principles calculations. Our study reveal that the migration energies at the p-type interface are lower than those at the n-type interface, and the formation energies of Sr and La vacancies are relatively high when we assume a reduction atmosphere and insulator conditions. To explain the experimental evidence that intermixing is preferentially taking place at the n-type interface, considering the Fermi energy is critical. We find that the presence of electron carriers plays an important role in the intermixing behaviors at the LaAlO3/SrTiO3 heterointerface
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(c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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ALKALINE EARTH METAL COMPOUNDS, ALUMINIUM COMPOUNDS, CHARGED PARTICLES, CRYSTAL DEFECTS, CRYSTAL STRUCTURE, ELEMENTARY PARTICLES, ELEMENTS, ENTHALPY, FERMIONS, IONS, LEPTONS, MATERIALS, METALS, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, POINT DEFECTS, RARE EARTH COMPOUNDS, RARE EARTHS, REACTION HEAT, STRONTIUM COMPOUNDS, THERMODYNAMIC PROPERTIES, TITANATES, TITANIUM COMPOUNDS, TRANSITION ELEMENT COMPOUNDS
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