Possibility and Desirability of Using Electromagnetic Pumps in the Emergency Heat Removal Systems of Fast Reactors

Bogdanova, E. V.; Зотов, Владимир Густавович; Malkin, Shmuel; Vitkovskii, I. V.; Kirillov, I.R.; Komov, K.A.; Federyaeva, V. S.

doi:10.1007/s10512-017-0253-9

Cited by 3 publications

(2 citation statements)

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“…Also, levels of trunk muscle activation were increased while variability of trunk muscle activation was decreased in patients with high fear of pain, fear-avoidance beliefs and pain catastrophizing [19−22]. Trunk movement variability has been compared between patients with LBP and controls in several studies, specifically during walking, again with inconsistent results [13,15,16,23]. However, the association between movement variability and pain-related psychological factors has, to our knowledge, not been studied.…”

Section: Introductionmentioning

confidence: 99%

Fear of movement is not associated with trunk movement variability during gait in patients with low back pain

Veeger

Trigt

et al. 2020

The Spine Journal

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BACKGROUND: Literature describing differences in motor control between low back pain (LBP) patients and healthy controls is very inconsistent, which may be an indication for the existence of subgroups. Pain-related psychological factors might play a role causing these differences. PURPOSE: To examine the relation between fear of movement and variability of kinematics and muscle activation during gait in LBP patients. STUDY DESIGN: Cross-sectional experimental design. PATIENT SAMPLE: Thirty-one Chinese LBP patients. OUTCOME MEASURES: Self-report measures: Visual Analog Score for pain; TAMPA-score; Physiologic measures: electromyography, range of motion. FUNCTIONAL MEASURES: LBP history; the physical load of profession, physical activity. METHODS: Patients were divided in high and low fear of movement groups. Participants walked on a treadmill at four speeds: very slow, slow, preferred and fast. Kinematics of the thorax and the pelvis were recorded, together with the electromyography of five bilateral trunk muscle pairs. Kinematic and electromyography data were analysed in terms of stride-to-stride pattern variability. Factor analysis was applied to assess interdependence of 11 variability measures. To test for differences between groups, a mixed-design multivariate analysis of variance was conducted. RESULTS: Kinematic variability and variability of muscle activation consistently loaded on different factors and thus represented different underlying variables. No significant Group effects on variability of kinematics and muscle activation were found (Hotelling's Trace F=0.237; 0.396, p=.959; .846, respectively). Speed significantly decreased kinematic variability and increased variability in muscle activation (Hotelling's Trace F=8.363; 4.595, p<.0001; <.0001, respectively). No significant interactions between Group and Speed were found (Hotelling's Trace F=0.204; 0.100, p=.762; .963, respectively). CONCLUSIONS: The results of this study do not support the hypothesis that variability in trunk kinematics and trunk muscle activation during gait in LBP patients are associated with fear of movement.

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Section: Introductionmentioning

confidence: 99%

Fear of movement is not associated with trunk movement variability during gait in patients with low back pain

Veeger

Trigt

et al. 2020

The Spine Journal

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“…Magnetohydrodynamics (MHDs) concern the interaction between electrically conducting liquids and applied magnetic fields. It has extensive applications in emergency heat removal in fast reactors, molten metal pumps for rapid removal of heat from cores, and feeder wall thinning mechanisms in flow‐assisted corrosion of alloys in nuclear reactor channels . Although often the working fluids in nuclear reactor systems are air and water, many non‐Newtonian liquids are increasingly being deployed.…”

Section: Introductionmentioning

confidence: 99%

Influence of variable viscosity and thermal conductivity, hydrodynamic, and thermal slips on magnetohydrodynamic micropolar flow: A numerical study

Rahman

Uddin

Bég

et al. 2019

Heat Trans. Asian Res.

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Thermophysical and wall-slip effects arise in many areas of nuclear technology. Motivated by such applications, in this article, the collective influence of variableviscosity, thermal conductivity, velocity and thermal slip effects on a steady two-dimensional magnetohydrodynamic micropolar fluid over a stretching sheet is analyzed numerically. The governing nonlinear partial differential equations have been converted into a system of nonlinear ordinary differential equations using suitable coordinate transformations. The numerical solutions of the problem are expressed in the form of nondimensional velocity and temperature profiles and discussed from their graphical representations. The Nachtsheim-Swigert shooting iteration technique together with the sixth-order Runge-Kutta integration scheme has been applied for the numerical solution. A comparison with the existing results has been done, and an excellent agreement is found. Further validation with the Adomian decomposition method is included for the general model. Interesting features in the heat and momentum characteristics are explored. It is found that a greater thermal slip and thermal conductivity elevate thermal boundary layer thickness. Increasing Prandtl number enhances the Nusselt number at the wall but reduces wall couple stress (microrotation gradient). Temperatures are enhanced with both the magnetic field and viscosity parameter. Increasing momentum (hydrodynamic) slip is found to accelerate the flow and elevate temperatures.boundary layers, magnetic field, micropolar fluids, nuclear thermal transport, numerical solutions, thermal slip, variable thermal conductivity, velocity slip | INTRODUCTIONHeat transfer is a fundamental aspect of many nuclear engineering transport processes. It may arise in any of the three familiar modes (conduction, convection, and radiation) and indeed these modes often arise simultaneously. Interesting applications include phase change saturated nucleation (see Uesawa et al 1 ), transient electrically conducting convection flows of liquid sodium, 2 nuclear propulsion systems cooling, 3 conjugate thermal transport, 4 supercritical thermal convection in rod bundles, 5 heat emission in turbulent flows of mercury, sodium, lead-bismuth, and sodium-potassium liquid metals, 6 and hybrid electrolysis systems exploiting nuclear energy. 7 Electromagnetic flows also arise in nuclear power systems wherein magnetic fields are deployed to control high-temperature electrically conducting plasmas from damaging, for example, channel walls. Magnetohydrodynamics (MHDs) concern the interaction between electrically conducting liquids and applied magnetic fields. It has extensive applications in emergency heat removal in fast reactors, 8 molten metal pumps for rapid removal of heat from cores, 9 and feeder wall thinning mechanisms in flow-assisted corrosion of alloys in nuclear reactor channels. 10 Although often the working fluids in nuclear reactor systems are air and water, many non-Newtonian liquids are increasingly being deployed. Such fl...

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Dissolution of Spent Nuclear Fuel Samples for Analytical Purposes

Momotov

Erin²,

Tikhonova³

2022

Radiochemistry

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Possibility and Desirability of Using Electromagnetic Pumps in the Emergency Heat Removal Systems of Fast Reactors

Cited by 3 publications

References 1 publication

Fear of movement is not associated with trunk movement variability during gait in patients with low back pain

Fear of movement is not associated with trunk movement variability during gait in patients with low back pain

Influence of variable viscosity and thermal conductivity, hydrodynamic, and thermal slips on magnetohydrodynamic micropolar flow: A numerical study

Dissolution of Spent Nuclear Fuel Samples for Analytical Purposes

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