Standard Free Thickness Determination of Thin TEM Samples via Backscatter Electron Image Correlation
Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009
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Final Results from the Crack Initiation and Arrest of Irradiated Steel Materials Project on Fracture Mechanical Assessments of Pre-Irradiated RPV Steels Used in German PWR
Abstract Pre-irradiated original reactor pressure vessel (RPV) materials covering all four German pressurized water reactors (PWR) construction lines were tested in the Crack Initiation and Arrest of Irradiated Steel Materials program to create a database of fracture toughness and arrest values for neutron fluences be…
Volume of Activation for the Corrosion of Type 304 Stainless Steel in High Subcritical and Supercritical Aqueous Systems
In this study, electrochemical emission spectroscopy (EES, commonly referred to as electrochemical noise analysis, ENA) was used to analyze the effect of pressure on corrosion reactions in high-temperature aqueous systems. A model was applied to study the effect of pressure on the corrosion activities (and hence corro…
Overload Fracture of Hydrided Region at Simulated Blunt Flaws in Zr-2.5Nb Pressure Tube Material
A crack initiation and growth mechanism known as delayed hydride cracking (DHC) is a concern for Zr-2.5Nb alloy pressure tubes of CANada Deuterium Uranium or CANDU (CANDU is a trademark of the Atomic Energy of Canada Limited, Ontario, Canada) nuclear reactors. DHC is a repetitive process that involves hydrogen diffusi…
Effect of Steel Fiber Addition on Mechanical Properties and gamma-Ray Attenuation for Ordinary Concrete Used in El-Gabal El-Akhdar Area in Libya for Radiation Shielding Purposes
This work deals with the study of ordinary concrete reinforced with steel fibers where the concrete was prepared from limestone ores as coarse aggregate, and sand as fine aggregate, in El-Gabal El-Akhdar in Libya in order to study some mechanical properties and gamma ray attenuation. For mechanical properties, compres…
Effect of Fe2+(Fe3+) Doping on Structural Properties οf CeO2Nanocrystals
We have measured the Raman scattering and magnetization of pure and Fe 2+ (Fe 3+ ) doped CeO2 nanopowders at room temperature. The Raman scattering spectra revealed the existence of CeO2 fluorite cubic structure for all investigated samples. The Raman active mode at about 600 cm -1 , seen in all samples, can be ascrib…
Competition between mixing and segregation in bimetallic AgnRbn clusters (n = 2–10),
We found the minimum-energy structures of Ag n Rb n (n = 2–10) clusters by a combination of density functional theory (DFT) and taboo search global optimization. The global minimum geometry is mixed for n ≤ 4 and segregated, with a core-shell arrangement, for n > 4. There is a change in the nature of the bonding, f…
The importance of defects for carbon nanoribbon based electronics
Abstract The utilization of graphene nanoribbons for next generation nanoelectronics is commonly expected to depend on the controlled synthesis that yields a low density of defects. Edge roughness and vacancies have been shown to have a large impact on the performance of graphene nanoribbon transistors. In contrast, w…
Atmospheric Electron Microscope: Limits of Observable Depth
Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009
Mixing, Curing and Reinforcement of NR/BR/EPDM Blends for Tire Sidewall Applications
Abstract Tire sidewalls generally consist of blends of natural rubber (NR) and butadiene rubber (BR), containing a high concentration of antiozonants to provide ozone resistance. However, the most widely used antiozonant, N-(1, 3-dimethyl-butyl)-N'-phenyl-p-phenylenediamine (6PPD), is a staining, toxic and environment…
Experimental Study on the Boiling Heat Removal at the Upper Surface of the Metallic Layer During Late-Phase Coolant Injection
Sustained heating experiments, named Experiments on Late-phase coolant Injection to ASsess the mitigation of focusing effect of metallic layer (ELIAS), were performed to quantify the boiling heat removal rate at the upper surface of a metallic layer for precise evaluations on the effect of a late-phase in-vessel coola…
Relation between the trend of partial discharges and aging models under AC voltage
The research work reported in this paper has the aim to contribute in the development of a new physical aging model for damage inception and growth from micro-cavities in polymeric insulating materials subjected to partial discharges (PD) under AC voltage. Aging tests were performed on polyethylene (PE) layered specim…
Pure lead nanoparticles with stable metallic surfaces, on perovskite lead strontium titanate particles
We demonstrate an efficient method of fabrication for pure lead nanoparticles with non-oxidized surfaces, supported on perovskite lead strontium titanate particles with a size distribution from tens to several hundreds of nanometers. The fabrication method is based on co-precipitation and subsequent annealing in air a…
Vibrational Spectroscopy and Electron−Phonon Interactions in Microwave-Hydrothermal Synthesized Ba(Mn1/3Nb2/3)O3Complex Perovskites
Ba(Mn1/3Nb2/3)O3 ceramics were synthesized by the microwave-hydrothermal process. Crystalline, single-phase, needle-like materials were obtained with high anisotropy and aspect ratio. Large crystals could be prepared from a direct combination of nanosized crystals under microwaves through an oriented attachment mechan…
Reduce Correlated Noise in EELS Spectrum with High Quality Dark Reference
Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009
Anharmonic phonon transport in atomic wire coupled by thermal contacts with surface bond reconstruction
Phonon transport in atomic wire coupled by two semi-infinite thermal contacts is investigated by atomic nonequilibrium Green’s functions. The effect on phonon transport due to anharmonicity in atomic wire and surface bond reconstruction of thermal contact is analyzed. It is found that surface bond reconstruction affec…
Study on parameter optimization of corona charging for melt-blown polypropylene electret nonwoven web used as air filter
The application of melt-blown polypropylene electret nonwoven web used as air filter will mainly depend on its high electret charge storage stability. Corona charging is an important method to provide charges to nonwoven web. In this paper, corona charging apparatus is proposed and same or opposite polarity charging m…
Research on evaluation method of composite insulators aging
This article introduces the research on composite insulator of various degrees by using Fourier transform infrared spectroscopy (FTIR). The results show there is a close relationship between absorption areas of the functional group of Si-CH3and Si-O-Si of silicone rubber shed and housing aging. Along with the severity…
Studies on NO releasing from PCU grafted with endogenous NO donors
Abstract Films of PCUs grafted with L ‐nitrosocysteine ( L ‐CySNO) were successfully prepared in the presence of 3‐aminopropyltriethoxysilane (APTES). The final products ( L ‐CySNO‐grafted PCU) were characterized with ATR‐FTIR, SEM, XPS, and tensile strength measurement. Tensile strength of the L ‐CySNO‐grafted PCU wa…
Preparation and characterization of CuO nanowire arrays
CuO nanowire arrays were prepared by oxidation of copper nanowires embedded in anodic aluminum oxide (AAO) membranes. The AAO was fabricated in an oxalic acid at a constant voltage. Copper nanowires were formed in the nanopores of the AAO membranes in an electrochemical deposition process. The oxidized copper nanowire…