characterization of microcrack in nuclear graphite and its relationship with the coefficient

Synthesis of a Novel Flame Retardant Containing

A novel flame retardant (TDA) containing phosphorus, nitrogen, and silicon was synthesized successfully via a controllable ring-opening addition reaction between 1,3,5-triglycidyl isocyanurate, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and 3-aminopropyltriethoxysilane, and TDA was then blended with diglycidyl ether of bisphenol A to prepare flame-retardant epoxy resins (EPs). The

SAXS

Purpose: This study aims at the changes in number distribution and its fractal characteristics of nanoscale pore in nuclear graphite. Methods: Two typical nuclear graphite, i.e., IG-110 and NBG-18 were sampled and tested at synchrotron radiation SAXS beamline station at temperatures of 25℃, 100℃, 200℃, 300℃ and 400℃, respectively.

The Basis for a Fracture Mechanics Assessment of Nuclear Graphite

To perform fracture mechanics assessments of nuclear graphite the following assumptions are made: Graphite behaves in a linear elastic manner, this is reasonable true for fine grained graphites, but is not the case for coarse grained graphites, where significant process

CHEMICAL CHARACTERIZATION OF THE ASPHALTENES

ABSTRACT In the present work, we report the chemical characterization of asphaltenes from a light Colombian crude oil, 36 API, Colorado Crude Oil (CCO). Asphaltenes of CCO were extracted using the standard ASTM procedure, ASTM D6560-12. The approach

Enabling Natural Graphite in High‐Voltage Aqueous

Graphite is a promising cathode material for dual‐ion batteries due to its high operating potential, low cost, and high safety. Nevertheless, it is challenging to find a suitable aqueous electrolyte due to the narrow electrochemical stability window (1.23 V).

Microstructural Characterization of Next Generation Nuclear

Microstructural Characterization of Next Generation Nuclear Graphites Chinnathambi Karthik,1,2,* Joshua Kane,1,2 Darryl P. Butt,1,2 William E. Windes,2,3 and Rick Ubic1,2 1Department of Materials Science and Engineering, Boise State University, 1910 University Drive, Boise, ID 83725, USA

Volume, Shape, and Roundness of Quartz Particles

The article deals with methods of measuring the volume, shape, and roundness of sedimentary quartz particles. Matthew C. Tweardy, Seth McConchie, Jason P. Hayward Quantifying the determinants of leakage multiplication for large uranium objects using Monte Carlo simulations, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated

Porosity Effects in Polycrystalline Graphite, Journal of

Thermal and physical properties of a series of porous, polycrystalline graphites have been measured. The solid matrix material was characterized by X‐ray diffraction measurements of crystallite size, interplanar spacing, and anisotropy. The pore structure was examined using electron micrography, porosimetry, permeability, and helium density measurements. Thermal and electrical conductivities

Rational synthesis, characterization, and application of

2020/2/5Background Carbon dots (CDs) are of particular interest in numerous applications. However, their efficiency for heavy metal removal from wastewater was not yet reported. Herein, we rationally synthesized CDs from petroleum coke waste via hydrothermal treatment in the presence of ammonia. Results This drove the formation of outstanding photoluminescent, water-soluble, biocompatible, and

Synchrotron X

2017/11/1The strain field of a crack in polygranular isotropic nuclear graphite, a quasi-brittle material, has been studied during stable fracture propagation. Synchrotron X-ray computed tomography and strain mapping by diffraction were combined with digital volume correlation and phase congruency image analysis to extract the full field displacements and elastic crystal strains.

Characterizing Graphene, Graphite, and Carbon

Recent advances in Raman spectroscopy for characterizing graphene, graphite, and carbon nanotubes are reviewed comparatively. We first discuss the first-order and the double-resonance (DR) second-order Raman scattering mechanisms in graphene, which give rise to the most prominent Raman features. Then, we review phonon-softening phenomena in Raman spectra as a function of gate

Characterization of microcrack in nuclear graphite and its

Characterization of microcrack in nuclear graphite and its relationship with the coefficient of thermal expansion Xue Wang Division of Materials research, Center for Thorium Molten Salt Reactor System(TMSR), Shanghai Institute of Applied Physics, Chinese

The solidification of ductile cast iron

The microsegregation of Mn, Cu, Cr, Mo, Ni and Si has been measured in cast ductile iron and in ductile iron which has been quenched when partially solidified. Effective segregation coefficients have been determined for each of the elements, and used to calculate the segregation on the basis of the Scheil equation. The calculated values agree reasonably well with the values of the solute

The solidification of ductile cast iron

The microsegregation of Mn, Cu, Cr, Mo, Ni and Si has been measured in cast ductile iron and in ductile iron which has been quenched when partially solidified. Effective segregation coefficients have been determined for each of the elements, and used to calculate the segregation on the basis of the Scheil equation. The calculated values agree reasonably well with the values of the solute

2D

2015/11/18The results showed a dependence relationship between high thermal conductivity ratios and enhanced sensitivity, small nanoparticle size, and higher temperature. Hence, nanofillers' size is a determinant variable for heat transfer nanofluids, since, as previously stated, its smaller size reduces or avoids critical issues of larger fillers.

Reduction of graphene oxide and graphene quantum dots

In colloidal form graphene was produced by oxidation of graphite in order to obtain graphene oxide (GO) which is in the next step reduced using different methods []. The common methods for GO reduction are chemical reactions with hydrazine, hydroquinone, sodium borohydride, or dimethylhydrazine [ 2 ], or with solvothermal method [ 3 ], freeze-dried [ 4 ], ect.

Generic Environmental Impact Statement for License

The data in Table 5.5 summarize the information for 28 nuclear plant sites that were used to develop the relationship between EI and consequences of severe accidents analysis for both PWRs and BWRs. Because of fundamental design differences between PWRs and BWRs, separate regression analyses were performed for each to better account for the BWR-PWR differences in plant failure modes and

Volume, Shape, and Roundness of Quartz Particles

The article deals with methods of measuring the volume, shape, and roundness of sedimentary quartz particles. Matthew C. Tweardy, Seth McConchie, Jason P. Hayward Quantifying the determinants of leakage multiplication for large uranium objects using Monte Carlo simulations, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated

Characterization of nuclear graphite elastic properties

article{osti_1265680, title = {Characterization of nuclear graphite elastic properties using laser ultrasonic methods}, author = {Zeng, Fan W and Han, Karen and Olasov, Lauren R and Gallego, Nidia C and Contescu, Cristian I and Spicer, James B}, abstractNote = {Laser ultrasonic methods have been used to characterize the elastic behaviors of commercially-available and legacy nuclear graphites.

Volume, Shape, and Roundness of Quartz Particles

The article deals with methods of measuring the volume, shape, and roundness of sedimentary quartz particles. Matthew C. Tweardy, Seth McConchie, Jason P. Hayward Quantifying the determinants of leakage multiplication for large uranium objects using Monte Carlo simulations, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated

Generic Environmental Impact Statement for License

The data in Table 5.5 summarize the information for 28 nuclear plant sites that were used to develop the relationship between EI and consequences of severe accidents analysis for both PWRs and BWRs. Because of fundamental design differences between PWRs and BWRs, separate regression analyses were performed for each to better account for the BWR-PWR differences in plant failure modes and

Neutron Cross

Typical nuclear radii are of the order 10 −14 m.Assuming spherical shape, nuclear radii can be calculated according to following formula: r = r 0.A 1/3 where r 0 = 1.2 x 10-15 m = 1.2 fm If we use this approximation, we therefore expect the geometrical cross-sections of nuclei to be of the order of πr 2 or 4.5 x 10 −30 m for hydrogen nuclei or 1.74 x 10 −28 m for 238 U nuclei.

CHEMICAL CHARACTERIZATION OF THE ASPHALTENES

ABSTRACT In the present work, we report the chemical characterization of asphaltenes from a light Colombian crude oil, 36 API, Colorado Crude Oil (CCO). Asphaltenes of CCO were extracted using the standard ASTM procedure, ASTM D6560-12. The approach

Nanocomposites: synthesis, structure, properties and new

251. Lee DC, Jang LW. Preparation and characterization of PMMA-clay composite by emulsion polymerization. Journal of Applied Polymer Science. 1996; 61(7):1117-1122. [ Links ] 252. Noh MW, Lee DC. Synthesis and characterization of ps-clay ]

Fieldable Neutron Imaging System: Simulation and

advancement to this end for the Fieldable Nuclear Materials Identification System (FNMIS). The effort was two pronged in its approach. First, a physical system was constructed and tested in an effort to reduce size and overall system weight. Simultaneously, a

Microstructural characterisation of nuclear grade graphite

2008/10/31For graphite fibres it has been found that there is a linear relationship between applied compressive strain and peak shift of about 7 cm −1 per 1% elastic strain, A similar dependence (1.2%) is also observed for nanotubes .

Full article: Dimensional change, irradiation creep and

2016/4/6Introduction The 'Nuclear Age' started with the use of graphite as a moderator to sustain a chain reaction in the Chicago Piles. 1 Since this world changing event, graphite has been used as a moderator in over 100 nuclear reactors, many of which are still operating and producing a significant amount of power in the UK (15 reactors, 2015) and Russia (11 reactors, 2015).

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