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Acoustic "pumping effect" for quartz monochromators

A. S. Gogolev、S. Stuchebrov、A. Vagner 等 5 位作者2012-05-03Journal of Physics Conference Series

There are investigations of dependences scattered at quartz crystals X-ray in Bragg direction of intensity on amplitude and frequency external alternating electromagnetic field, which initiates acoustic waves in crystal, in spectral mode.

Solid-state spectroscopy and crystallographyOptical and Acousto-Optic Technologies

Comparative first-principle analysis of un-doped and V3+-doped α-ZnAl2S4 spinel

M.G. Brik、Mihail Nazarov、M.N. Ahmad-Fauzi 等 7 位作者2012-05-03Journal of Luminescence

The experimental and theoretical studies of the optical properties of pure α-ZnAl 2 S 4 and α-ZnAl 2 S 4 :V 3+ crystals were carried out. The ab initio and crystal field calculations of the structural and optical properties of α-ZnAl 2 S 4 :V 3+ were compared with the corresponding experimental data. It was shown that…

Chalcogenide Semiconductor Thin FilmsCrystal Structures and PropertiesX-ray Diffraction in Crystallography

Mismatch of conductivity anisotropy in the mixed and normal states of type-II superconductors

A. A. Bespalov、A. S. Mel’nikov2012-05-03Physical Review B

We have calculated the Bardeen-Stephen contribution to the vortex viscosity for uniaxial anisotropic superconductors within the time-dependent Ginzburg-Landau (TDGL) theory. We focus our attention on superconductors with a mismatch of anisotropy of normal and superconducting characteristics. Exact asymptotics for the…

Physics of Superconductivity and MagnetismAdvanced Condensed Matter PhysicsIron-based superconductors research

Spontaneous Formation of Giant Polymer Vesicles through a Nucleation and Growth Pathway

Hanqing Qian、Wei Yao、Shuling Yu 等 6 位作者2012-05-03Chemistry - An Asian Journal

The non-membrane-closing formation of polymer vesicles was demonstrated by the self-assembly of an amphiphilic hydrogen-bonded interpolymer complex of HPC and PAA. A dynamic-formation process that involved a nucleation and growth pathway was observed experimentally that was different from the theoretical predictions o…

Advanced Polymer Synthesis and CharacterizationSurfactants and Colloidal SystemsPolymer Surface Interaction Studies

Dinitrophenyl Triazoles – “A Class of Energetic Azoles”: Synthesis, Characterisation, and Performance Evaluation Studies

Nimesh Sasidharan、A. G. Rajendran2012-05-03Propellants Explosives Pyrotechnics

Abstract Energetic azoles have shown great potential as powerful energetic molecules, which find various applications in both military and civilian fields. This work describes the synthesis, characterization and performance evaluation of two energetic triazole derivatives, viz. N‐(2,4‐dinitrophenyl)‐3‐nitro‐1H‐1,2,4‐t…

Energetic Materials and CombustionThermal and Kinetic AnalysisChemical Thermodynamics and Molecular Structure

Thioether Crosslinkages Created by a Radical SAM Enzyme

Qi Zhang、Yi Yu2012-05-03ChemBioChem

Unusually versatile: While the β-carbon thioether linkage in lantibiotics has long been appreciated and is relatively well characterized, a recent publication shows that the unusual sulfur-to-α-carbon thioether crosslinks in subtilosin A are produced by a radical SAM enzyme, AlbA, that contains two [4 Fe-4 S] clusters…

Polyoxometalates: Synthesis and ApplicationsMetalloenzymes and iron-sulfur proteinsPeptidase Inhibition and Analysis

An etched multilayer as a dispersive element in a curved‐crystal spectrometer: implementation and performance

P. Jonnard、Karine Le Guen、Jean‐Marc André 等 5 位作者2012-05-03X-Ray Spectrometry

Etched multilayers obtained by forming a laminar grating pattern within interferential multilayer mirrors are used in the soft X‐ray range to improve the spectral resolution of wavelength dispersive spectrometers equipped with periodic multilayers. We describe the fabrication process of such an etched multilayer dispe…

Advanced X-ray Imaging TechniquesX-ray Spectroscopy and Fluorescence AnalysisElectron and X-Ray Spectroscopy Techniques

Ultrahigh gain AlGaN/GaN high energy radiation detectors

John Howgate、Markus Hofstetter、Sebastian J. Schoell 等 12 位作者2012-05-03physica status solidi (a)

Abstract Due to its remarkable tolerance to high energy ionizing radiation, GaN has recently attracted attention as a promising material for dosimetry applications. However, materials issues that lead to persistent photoconductivity, poor sensitivity, and requirements for large operational voltages have been hurdles t…

GaN-based semiconductor devices and materialsGa2O3 and related materialsPhotocathodes and Microchannel Plates

Simple inversion formula for the small-angle X-ray scattering intensity from polydisperse systems of spheres

Robert Botet、Bernard Cabane2012-05-03Journal of Applied Crystallography

A practical inversion method to calculate the size distribution of colloidal homogeneous particles from small-angle scattering experiments is presented. It is based on the analysis of the deviations of the scattering signal from the Porod law. The resulting inversion formula provides a reliable way to assess complex s…

Soil and Unsaturated FlowClay minerals and soil interactionsIron oxide chemistry and applications

Ultrasonic Assessment of Bullet Inflicted Damage in Aramid Laminated Composites

Nityananda Nayak、Arnab Banerjee、Debasis Datta2012-05-03Defence Science Journal

Immersion type ultrasonic C-scan has been performed on Twaron-epoxy (T-E) and Twaron-polypropylene (T-PP) composite laminates impacted by 7.62 mm armor piercing (AP) projectile with different striking velocitiesto assess the bullet inflicted damage area. Square zones of size 72 mm by 72 mm around each impact area are…

Mechanical Behavior of CompositesEpoxy Resin Curing ProcessesHigh-Velocity Impact and Material Behavior

The characterization and transmission of scattered radiation resulting from x-ray beams filtered with zero to 0.99 mm copper

David Sutton、C J Martin、Debbie Peet 等 4 位作者2012-05-03Journal of Radiological Protection

The specification of shielding for fluoroscopic facilities in the UK is based on the determination of scatter incident on a barrier using a simple formula linking kerma area product and scatter kerma. Over the last few years there has been a move to incorporate additional copper filtration in equipment used for high d…

Radiation Dose and ImagingRadiation Shielding Materials AnalysisAdvanced X-ray and CT Imaging

Persistent dynamics in the S=1/2 quasi-one-dimensional chain compound Rb 4 Cu(MoO 4 ) 3 probed with muon-spin relaxation

Tom Lancaster、Peter J. Baker、F. L. Pratt 等 6 位作者2012-05-03Physical Review B

We report the results of muon-spin relaxation measurements on the low-dimensional antiferromagnet Rb${}_{4}$Cu(MoO${}_{4}$)${}_{3}$. No long-range magnetic order is observed down to 50 mK implying a ratio ${T}_{\mathrm{N}}/J<0.005$ (where $J$ is the principal exchange strength along the spin chains) and an effective r…

Physics of Superconductivity and MagnetismMagnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter Physics

Mineralization of hydroxyapatite crystallites on zein microspheres

Yueling Li、Chen Yao2012-05-03Polymer Composites

Abstract Bioinspired mineralization process has been extended to the formation of bonelike hydroxyapatite (HAp) coatings on biodegradable polymer substrates. HAp‐coated zein microspheres were prepared through phase separation procedure, followed by incubation in modified simulated body fluids (mSBF). The morphologies…

Bone Tissue Engineering Materialsbiodegradable polymer synthesis and propertiesCalcium Carbonate Crystallization and Inhibition

Influence of the epoxy functionalization of multiwall carbon nanotubes on the nonisothermal cure kinetics and thermal properties of epoxy/multiwall carbon nanotube nanocomposites

Mohamad Barghamadi、Hossein Behmadi2012-05-03Polymer Composites

Abstract Multiwall carbon nanotubes were functionalized with epoxy groups by chemical modification in four stages. At each stage, the compound was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy (SEM). Epoxy composite samples were prepared by mixing diglycidyl ether of bisphen…

Carbon Nanotubes in CompositesPolymer Nanocomposites and PropertiesEpoxy Resin Curing Processes

Atomic-hydrogen cleaning of Sn from Mo/Si and DLC/Si extreme ultraviolet multilayer mirrors

Wouter Soer、Maarten M. J. W. van Herpen、Martin Jak 等 8 位作者2012-05-03Journal of Micro/Nanolithography MEMS and MOEMS

We have investigated the use of atomic-hydrogen-based cleaning to remove Sn contamination from extreme ultraviolet (EUV) multilayer mirrors. Mo and Si surfaces were cleaned at a relatively slow rate due to catalyzed dissociation of tin hydride on these surfaces. Mo/Si mirrors with B4C and Si3N4 cap layers and DLC-term…

Advancements in Photolithography TechniquesElectron and X-Ray Spectroscopy TechniquesSurface Roughness and Optical Measurements

The Impact of Carrier Transport Confinement on the Energy Transfer Between InGaN/GaN Quantum‐Well Nanorods and Colloidal Nanocrystals

Bin Jiang、Chunfeng Zhang、Xiaoyong Wang 等 10 位作者2012-05-03Advanced Functional Materials

Abstract The energy transfer (ET) between InGaN/GaN multiple‐quantum‐well (MQW) nanorods (NRs) and semiconductor nanocrystals (NCs) for efficient color conversion is studied. An exceptional contribution of carrier transport confinement to the ET mechanisms is observed in the proximal side‐wall coupling system, which c…

ZnO doping and propertiesGaN-based semiconductor devices and materialsGa2O3 and related materials

Taming the Beast: Measurement of the Enthalpies of Combustion and Formation of Triacetone Triperoxide (TATP) and Diacetone Diperoxide (DADP) by Oxygen Bomb Calorimetry

Alessandro Contini、Anthony J. Bellamy、Leila N. Ahad2012-05-03Propellants Explosives Pyrotechnics

Abstract Low‐melting paraffin wax was successfully used as a phlegmatizing agent to perform semi‐micro oxygen bomb calorimetry of spectroscopically pure samples of the sensitive explosive peroxides TATP and DADP. The energies of combustion (ΔcU) were measured and the standard enthalpies of formation (ΔfH°) were derive…

Energetic Materials and CombustionThermal and Kinetic AnalysisChemical Thermodynamics and Molecular Structure

Effect of number of grindings of attapulgite on enhanced swelling properties of the superabsorbent nanocomposites

Yi Liu、Hong Chen、Junping Zhang 等 4 位作者2012-05-03Journal of Composite Materials

The incorporation of clay has become a preferred method for superabsorbent composite preparation because of its great influence on the swelling properties. The mechanical chemistry shows that grinding treatment could change the physical and chemical properties of clay. Therefore, in this article, the grinding treated…

Hydrogels: synthesis, properties, applicationsAdvanced Polymer Synthesis and CharacterizationPolymer Nanocomposites and Properties

Chemical Mechanical Planarization from Macro-Scale to Molecular-Scale

Yongguang Wang、Yongwu Zhao、Xiaohuan Chen2012-05-03Materials and Manufacturing Processes

Chemical mechanical planarization (CMP) has been an essential method to fabricate wafer surfaces in IC industry. This article provides a relatively comprehensive review on the state-of-the-art and recent progress in the modeling of CMP and material removal mechanism, and addresses the limitations and further research…

Advanced machining processes and optimizationDiamond and Carbon-based Materials ResearchAdvanced Surface Polishing Techniques

Synthesis and characterization of new derivatives of azulene, including experimental and theoretical studies of electronic and spectroscopic behavior

Sebastian Förster、Torsten Hahn、C. Loose 等 9 位作者2012-05-03Journal of Physical Organic Chemistry

Four new azulene derivatives featuring two π‐conjugated and sulfur terminated rigid side arms in the 1,3‐positions of the azulene core were designed, synthesized, and characterized. The syntheses were carried out on the basis of a palladium cross‐coupling procedure in the key reaction step. The crystal structures of t…

Photochemistry and Electron Transfer StudiesLuminescence and Fluorescent MaterialsSynthesis and Properties of Aromatic Compounds