scholarly journals Experimental Results for Direct Electron Irradiation of a Uranyl Sulfate Solution: Bubble Formation and Thermal Hydraulics Studies

2015 ◽  
Author(s):  
Sergey Chemerisov ◽  
R. Gromov ◽  
Vakhtang Makarashvili ◽  
Thad Heltemes ◽  
Zaijing Sun ◽  
...  
Keyword(s):  
Electron Irradiation ◽  
Bubble Formation ◽  
Sulfate Solution ◽  
Experimental Results ◽  
Thermal Hydraulics ◽  
Uranyl Sulfate

The Linear System Solver of Programs Named CORTH and KYLIN2

2017 ◽  
Author(s):  
Pingzhou Ming ◽  
Junjie Pan ◽  
Xiaolan Tu ◽  
Dong Liu ◽  
Hongxing Yu
Keyword(s):  
Linear System ◽  
Linear Systems ◽  
Nuclear Power ◽  
Experimental Results ◽  
Gmres Method ◽  
Thermal Hydraulics ◽  
Lattice Calculation ◽  
Minimal Residual

Sub-channel thermal-hydraulics program named CORTH and assembly lattice calculation program named KYLIN2 have been developed in Nuclear Power Institute of China (NPIC). For the sake of promoting the computing efficiency of these programs and achieving the better description on fined parameters of reactor, the programs’ structure and details are interpreted. Then the characteristics of linear systems of these programs are analyzed. Based on the Generalized Minimal Residual (GMRES) method, different parallel schemes and implementations are considered. The experimental results show that calculation efficiencies of them are improved greatly compared with the serial situation.

A Quantitative Model for the Metastable Defect Creation in Amorphous Semiconductors by Kev-Electron Irradiation

1994 ◽  
Vol 336 ◽  
Author(s):  
A. Scholz ◽  
B. Schröder ◽  
H. Oechsner
Keyword(s):  
Energy Dissipation ◽  
Electron Irradiation ◽  
Quantitative Agreement ◽  
Quantitative Model ◽  
Amorphous Semiconductor ◽  
Amorphous Semiconductors ◽  
Experimental Results ◽  
Defect Creation ◽  
Hydrogenated Amorphous ◽  
Metastable Defect

ABSTRACTThe interaction mechanisms of keV-electrons with the hydrogenated Amorphous semiconductor are briefly discussed and the differences to the metastable defect creation by photons are set out. Based on the knowlegde of the energy dissipation mechanisms of keV-electrons in the hydrogenated Amorphous semiconductor, a model for the creation of metastable defects by keV-electron irradiation is developed and its quantitative agreement with the experimental results is shown.

scholarly journals Mathematical modeling of ferrous sulfate oxidation in presence of air

2018 ◽  
Vol 210 ◽  
pp. 04043
Author(s):  
Juan Carlos Beltrán-Prieto ◽  
Karel Kolomazník
Keyword(s):  
Mathematical Modeling ◽  
Differential Equations ◽  
Ammonium Sulfate ◽  
Rate Constants ◽  
Ferrous Sulfate ◽  
Sulfate Solution ◽  
Experimental Results ◽  
Sulfate Salt ◽  
Ferric Ammonium ◽  
Gas Washing

In the present paper we studied the oxidation of ferrous sulfate salt with oxygen. ferric ammonium sulfate and ferrous sulfate were used to prepare standard solutions of Fe(III) and Fe(II) solutions. Oxidation experiments were carried out by mixing FeSO4·7 H2O in H2O. Air was supplied using a gas washing bottle in which air entered the bottle through the center tube, and exited into the bottom of the bottle. Samples were taken periodically and analyzed in the UV-Vis spectrophotometer. We consider that basic Fe(III) sulfate was one of the main compounds produced during the reaction and proposed a model to describe the process. We found solution to the differential equations that described the profile of FeSO4 and FwOHSO4 concentration in time and observed agreement between the experimental results and data predicted by the model. Moreover, we determined values of rate constants using the model and confirmed the determined values by means of experiments. This suggests that basic ferric sulfate was generated after aeration of ferrous sulfate solution.

Influence of Adding Lime Dust on Compressive Strength and Frost Resistance of Fly Ash Recycled Concrete

2013 ◽  
Vol 671-674 ◽  
pp. 1813-1816
Author(s):  
Xiang Hao Wu ◽  
Yong Xin Yao ◽  
Xing Wei Yin ◽  
Pan Yuan
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Frost Resistance ◽  
Sulfate Solution ◽  
Recycled Concrete ◽  
Experimental Results ◽  
Compression Tests ◽  
Concrete Compressive Strength ◽  
Recycle Concrete ◽  
The Right

The influence of part of fly ash replaced with lime dust on fly ash recycle concrete compressive strength and frost resistance is investigated by compression tests and rapid frost-thawing test. The experimental results show that part of fly ash replaced with lime dust will reduce the early compressive strength of the fly ash recycled concrete; the right amount of lime dust replacing fly ash can raise the latter compressive strength of fly ash recycled concrete, the best replacement proportion is 10%. The anti-frozen capacity of fly ash recycled concrete will reduce by replacing part of fly ash with lime dust, and the amplitude reduction of anti-frozen capacity of fly ash recycled concrete in seawater is greater than the amplitude reduction in sulfate solution and in freshwater.

scholarly journals A Solution-Based Approach for Mo-99 Production: Considerations for Nitrate versus Sulfate Media

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Amanda J. Youker ◽  
Sergey D. Chemerisov ◽  
Michael Kalensky ◽  
Peter Tkac ◽  
Delbert L. Bowers ◽  
...  
Keyword(s):  
Uranyl Nitrate ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Fission Products ◽  
Sulfate Solution ◽  
Medical Community ◽  
High Radiation ◽  
Uranyl Sulfate ◽  
Sulfate Solutions ◽  
Nitrate Solutions

Molybdenum-99 is the parent of Technetium-99m, which is used in nearly 80% of all nuclear medicine procedures. The medical community has been plagued by Mo-99 shortages due to aging reactors, such as the NRU (National Research Universal) reactor in Canada. There are currently no US producers of Mo-99, and NRU is scheduled for shutdown in 2016, which means that another Mo-99 shortage is imminent unless a potential domestic Mo-99 producer fills the void. Argonne National Laboratory is assisting two potential domestic suppliers of Mo-99 by examining the effects of a uranyl nitrate versus a uranyl sulfate target solution configuration on Mo-99 production. Uranyl nitrate solutions are easier to prepare and do not generate detectable amounts of peroxide upon irradiation, but a high radiation field can lead to a large increase in pH, which can lead to the precipitation of fission products and uranyl hydroxides. Uranyl sulfate solutions are more difficult to prepare, and enough peroxide is generated during irradiation to cause precipitation of uranyl peroxide, but this can be prevented by adding a catalyst to the solution. A titania sorbent can be used to recover Mo-99 from a highly concentrated uranyl nitrate or uranyl sulfate solution; however, different approaches must be taken to prevent precipitation during Mo-99 production.

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