Investigation of algorithms for suppressing xenon oscillations in a VVER-1200 reactor [PDF]
Nuclear Energy and Technology, 2022 This paper presents the results of numerical studies of various algorithms for suppression of xenon offset and power distribution oscillations in the core of a VVER-1200 reactor.
Denis A. Soloviev +3 more
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Optimizing reliability of RBC signal oscillation measures from hyperpolarized 129Xe MRI. [PDF]
PLoS ONERecent advances to gas exchange hyperpolarized 129Xe MRI (Xe-MRI) have demonstrated that cardiogenic oscillations within the xenon red blood cell (RBC) signal are sensitive to pulmonary disease. Moreover, by implementing keyhole image reconstruction with
Ivina Mali +3 more
doaj +2 more sources
Engineering Ultrastable Intrinsic Radicals: Graphene Quantum Dots With NIR-II Emission for Dynamic Deep-Tissue Bioimaging. [PDF]
Adv Sci (Weinh)Stable radicals are attractive for photonic and quantum information technologies but are often limited by instability. We stabilize intrinsic radicals in graphene quantum dots via 2D polymerization of perylene derivatives, where bilayer defect confinement suppresses quenching (100–500 K).
Xu Q +9 more
europepmc +2 more sources
Feasibility and SNR Performance of Hyperpolarized <sup>129</sup>Xe Gas Exchange Imaging Using a Balanced SSFP Sequence. [PDF]
Magn Reson MedABSTRACT Purpose To develop a balanced SSFP (bSSFP) sequence for pulmonary 129Xe dissolved‐phase imaging based on a previously described double‐echo sequence facilitating separation into red blood cell and membrane signals, to test its feasibility and compare its SNR performance and imaging results to an analogous FLASH sequence.
Kern AL +4 more
europepmc +2 more sources
EFFECTS OF FUEL TEMPERATURE-SHAPING FUNCTIONS ON XENON OSCILLATIONS [PDF]
EPJ Web of Conferences, 2021 In coupled multiphysics simulations, single pin-averaged values are typically used to describe the temperature, power, and burnup within a given fuel pin.
Walker Erik +3 more
doaj +1 more source
EXTENSION OF XENON OSCILLATIONS SAFETY MARGINS USING WEAKLY NONLINEAR STABILITY ANALYSIS [PDF]
EPJ Web of Conferences, 2021 Weakly nonlinear stability analysis is applied to study xenon oscillations in nuclear reactors using the approach of multiple time-scales method. This approach allows to characterize the dynamics of the system beyond the Hopf instability point.
Kastin Nir +3 more
doaj +1 more source
Investigation of the impact of steady-state VVER-1000 (1200) core characteristics on the reactor stability with respect to xenon oscillations [PDF]
Nuclear Energy and Technology, 2020 The article presents a method for obtaining an analytical expression for the criterion of stability of a VVER-1000 (1200) reactor with respect to xenon oscillations of the local power in the core, containing an explicit dependence of the criterion ratio ...
Rashdan Talal Al Malkawi +2 more
doaj +3 more sources
Control of the axial offset in a nuclear reactor at power maneuvering
Trudy Odesskogo Politehničeskogo Universiteta, 2014 High reliability and security of power unit are basic requirements when the power unit maneuvering mode operation. The reactor stability under disturbances both at steady load and maneuvering load embodies the guarantees of power unit safe and reliable ...
Максим Віталійович Максимов +2 more
doaj +7 more sources
Глобальная ядерная безопасность, 2022 This paper presents the results of the influence of reactivity on fuel temperature distribution for the neutron-physical characteristics of WWER 1000-1200 cores, which in turn affects the parameters of Xenon oscillation.
R. T. Al Malkawi, L. J. Zadan
doaj +1 more source
Modeling and control of xenon oscillations in thermal neutron reactors
EPJ Nuclear Sciences & Technologies, 2020 We study axial core oscillations due to xenon poisoning in thermal neutron nuclear reactors with simple 1D models: a linear one-group model, a linear two-group model, and a non-linear model taking the Doppler effect into account.
Mercier Bertrand +3 more
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