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Design of bars in tension or compression exposed to a corrosive environment
Fridman, Mark M.,Elishakoff, Isaac Techno-Press 2015 Ocean systems engineering Vol.5 No.1
This study is devoted to the optimal design of compressed bars under axial tensile or compressive forces and exposed to a corrosive environment. Dolinskii's linear stress corrosion model is adopted for analysis. Analytical and numerical results are derived for optimal variation of the cross-sectional area of the bar along its axis.
Definition of the neutronics benchmark of the NuScale-like core
Fridman Emil,Bilodid Yurii,Valtavirta Ville 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.10
This paper defines a 3D full core neutronics benchmark which is based on the NuScale small modular reactor (SMR) concept. The paper provides a detailed description of the NuScale-like core, a list of expected outputs, and a reference solution to the benchmark exercises obtained with the Monte Carlo code Serpent. The benchmark was developed in the framework of the Euratom McSAFER project and can be used for verification of computational chains dedicated to 3D full-core neutronics simulations of water cooled SMRs. The paper is supplemented with a digital data set to ease the modeling process
PERTURBATION OF DOMAINS AND AUTOMORPHISM GROUPS
Fridman, Buma L.,Ma, Daowei Korean Mathematical Society 2003 대한수학회지 Vol.40 No.3
The paper is devoted to the description of changes of the structure of the holomorphic automorphism group of a bounded domain in \mathbb{C}^n under small perturbation of this domain in the Hausdorff metric. We consider a number of examples when an arbitrary small perturbation can lead to a domain with a larger group, present theorems concerning upper semicontinuity property of some invariants of automorphism groups. We also prove that the dimension of an abelian subgroup of the automorphism group of a bounded domain in \mathbb{C}^n does not exceed n.
Buckling optimization of compressed bars undergoing corrosion
Fridman, Mark M.,Elishakoff, Isaac Techno-Press 2013 Ocean systems engineering Vol.3 No.2
This study is devoted to the optimal design of compressed bars under axial compressive forces and exposed to a corrosive environment. The initial volume of the structure is taken as an optimality parameter. Gutman - Zainullin's exponential stress corrosion model is adopted for analysis. Analytical and numerical results are derived for optimal variation of the cross-sectional area of the bar along its axis.
Perturbation of domains and automorphism groups
Buma L. Fridman,Daowei Ma 대한수학회 2003 대한수학회지 Vol.40 No.3
The paper is devoted to the description of changes of the structure of the holomorphic automorphism group of a bounded domain in $\CC^n$ under small perturbation of this domain in the Hausdorff metric. We consider a number of examples when an arbitrary small perturbation can lead to a domain with a larger group, present theorems concerning upper semicontinuity property of some invariants of automorphism groups. We also prove that the dimension of an abelian subgroup of the automorphism group of a bounded domain in ${\Bbb C}^n$ does not exceed $n$.
CEFR control rod drop transient simulation using RAST-F code system
Tran Tuan Quoc,Huo Xingkai,Fridman Emil,이덕중 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.12
This study aimed to verify and validate the transient simulation capability of the hybrid code system RAST-F for fast reactor analysis. For this purpose, control rod (CR) drop experiments involving eight separate CRs and six CR groups in the China Experimental Fast Reactor (CEFR) start-up tests were utilized to simulate the CR drop transient. The RAST-F numerical solution, including the neutron population, time-dependent reactivity, and CR worth, was compared against the measurement values obtained from two out-of-core detectors. Moreover, the time-dependent reactivity and CR worth from RAST-F were verified against the results obtained by the Monte Carlo code Serpent using continuous energy nuclear data. A code-to-code comparison between Serpent and RAST-F showed good agreement in terms of time-dependent reactivity and CR worth. The discrepancy was less than 160 pcm for reactivity and less than 110 pcm for CR worth. RAST-F solution was almost identical to the measurement data in terms of neutron population and reactivity. All the calculated CR worth results agreed with experimental results within two standard deviations of experimental uncertainty for all CRs and CR groups. This work demonstrates that the RAST-F code system can be a potential tool for analyzing time-dependent phenomena in fast reactors.
Kim, H.S.,Lee, D.H.,Fridman, A.,Cho, Y.I. Pergamon Press ; Elsevier Science Ltd 2014 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.77 No.-
The present study investigated the residual effect of gliding arc discharge (GAD) treatment on the inactivation of bacteria in a large volume of water (i.e., 20L). Pure water and air were introduced to GAD separately, and then both the gas and water treated by plasma were sent to bacteria-containing water. Water contaminated by Escherichia coli (E. coli) was first treated by GAD for 10, 13 and 16, and 25min and then stored for the next 4h, during which time the E. coli concentration and pH were measured. In general, GAD produced the strong anti-microbial properties, a phenomenon which increased with plasma treatment time. More specifically, E. coli was partially inactivated (i.e., approximately 2.7-log reduction) with 16-min plasma treatment. However, E. coli was almost completely inactivated (over 99.9% with 5-log reduction) during the subsequent 4-h storage period, a phenomenon that was attributed to the residual effect of the plasma treatment. The optimum plasma energy cost of the GAD treatment to inactivate E. coli in 20-L water in the present study was found to be approximately 0.57kJ/L per 1-log reduction.