scholarly journals Simple beam-optic simulations and proposed mechanical mitigation for the triplet oscillation problem

2008 ◽  
Author(s):  
Thieberger P. ◽  
C. Montag ◽  
L. Snydstrup ◽  
D. Trbojevic ◽  
J.E. Tuozzolo
Keyword(s):  
Oscillation Problem ◽  
Beam Optic

scholarly journals Simple Beam-Optic Simulations and Proposed Mechanical Mitigation for the Triplet Oscillation Problem

2008 ◽  
Author(s):  
P. Thieberger ◽  
C. Montag ◽  
L. Snydstrup ◽  
D. Trbojevic ◽  
J. Tuozzolo
Keyword(s):  
Oscillation Problem ◽  
Beam Optic

Haar Wavelet Solution Analysis of Compound Pendulum-based Computational Electromagnetic Damping Oscillation Problem

2021 ◽  
pp. 1-9
Author(s):  
Arun Kumar ◽  
Mohammad Shabi Hashmi ◽  
Abdul Quaiyum Ansari ◽  
Sultangali Arzykulov
Keyword(s):  
Haar Wavelet ◽  
Electromagnetic Damping ◽  
Oscillation Problem

scholarly journals Improved FAST Device for Inherent Safety of Oxide-Fueled Sodium-Cooled Fast Reactors

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4610
Author(s):  
Ahmed Amin E. Abdelhameed ◽  
Chihyung Kim ◽  
Yonghee Kim
Keyword(s):  
Operating Temperature ◽  
Reactor Core ◽  
Coolant Temperature ◽  
Inherent Safety ◽  
Oxide Fuel ◽  
Fast Reactors ◽  
Power Oscillation ◽  
Negative Reactivity ◽  
Oscillation Problem ◽  
Reactivity Coefficient

The floating absorber for safety at transient (FAST) was proposed as a solution for the positive coolant temperature coefficient in sodium-cooled fast reactors (SFRs). It is designed to insert negative reactivity in the case of coolant temperature rise or coolant voiding in an inherently passive way. The use of the original FAST design showed effectiveness in protecting the reactor core during some anticipated transients without scram (ATWS) events. However, oscillation behaviors of power due to refloating of the absorber module in FAST were observed during other ATWS events. In this paper, we propose an improved FAST device (iFAST), in which a constraint is imposed on the sinking (insertion) limit of the absorber module in FAST. This provides a simple and effective solution to the power oscillation problem. Here, we focus on an oxide fuel-loaded SFR that is characterized by a more negative Doppler reactivity coefficient and higher operating temperature than the metallic-loaded SFR cores. The study is carried out for the 1000 MWth advanced burner reactor with an oxide fuel-loaded core during postulated ATWS events that are unprotected transient over power, unprotected loss of flow, and unprotected loss of the heat sink. It was found that the iFAST device has promising potentials for protecting the oxide SFR core during the various studied ATWS events.

scholarly journals OSCILLATION PROBLEM IN PITCH ANGLE CONTROL OF WINGED BODY

2005 ◽  
Vol 38 (1) ◽  
pp. 247-252
Author(s):  
Igor Ŝkrjanc ◽  
Marko Lepetić ◽  
SaŜo Blaziĉ ◽  
Yasuhiro Morita
Keyword(s):  
Pitch Angle ◽  
Oscillation Problem

scholarly journals Oscillation criteria for a class of partial functional-differential equations of higher order

2002 ◽  
Vol 15 (3) ◽  
pp. 255-267 ◽  
Author(s):  
Tariel Kiguradze ◽  
Takasi Kusano ◽  
Norio Yoshida
Keyword(s):  
Differential Equations ◽  
Hyperbolic Equations ◽  
Functional Differential Equations ◽  
Sufficient Conditions ◽  
Higher Order ◽  
Cylindrical Domain ◽  
One Dimensional ◽  
Beam Equations ◽  
Oscillation Problem ◽  
Functional Differential

Higher order partial differential equations with functional arguments including hyperbolic equations and beam equations are studied. Sufficient conditions are derived for every solution of certain boundary value problems to be oscillatory in a cylindrical domain. Our approach is to reduce the multi-dimensional oscillation problem to a one-dimensional problem for higher order functional differential inequalities.

The Review of Photovoltaic Power System and Chaos Phenomenon

2011 ◽  
Vol 308-310 ◽  
pp. 193-196
Author(s):  
Xue Song Zhou ◽  
Jin Li ◽  
You Jie Ma
Keyword(s):  
Power System ◽  
Feedback Linearization ◽  
Control Method ◽  
Photovoltaic Power ◽  
Operation Process ◽  
Tracking Controller ◽  
Oscillation Problem ◽  
Grid Operation

This article introduces the composition and classification of Photovoltaic power system, makes Photovoltaic Grid Power System as an example, and Research the problem that is met in the grid operation process—Chaos Oscillation. For Chaos Oscillation problem in the Photovoltaic Grid Power System, paper elaborates conventional control method on Chaos, comes up with the theory that is applied to control method in Chaos Oscillation using Feedback Linearization to design a tracking controller to make Chaos Oscillation disappear in Photovoltaic Grid Power System.

scholarly journals Research and Development of the Artemis 14C AMS Facility: Status Report

Radiocarbon ◽  
2013 ◽  
Vol 55 (2) ◽  
pp. 331-337 ◽  
Author(s):  
C Moreau ◽  
I Caffy ◽  
C Comby ◽  
E Delqué-Količ ◽  
J-P Dumoulin ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Research And Development ◽  
Status Report ◽  
Development Programs ◽  
Technical Developments ◽  
Ancient Iron ◽  
International Collaborations ◽  
Beam Optic ◽  
Water Sample Preparation

The Artemis accelerator mass spectrometry (AMS) facility is dedicated to high-precision radiocarbon measurements. It routinely measures over 4500 samples a year for French laboratories. This paper is a status report, showing the measurements of standard, blank, and FIRI intercomparison samples. Since 2008, research and development programs have been established by the Artemis team. During the collaborations with other research laboratories, intercomparisons on archaeological samples were performed and are listed here to show the quality of the Artemis measurements. Three areas of specific research and development are investigated: technical development, beam optic simulations, and specific archaeological studies. The technical developments of the facility are based on the setup of a new bench for water sample preparation and routine microsample preparation and measurement. Beam optic simulations are carried out to control the quality of the measurement related to the tuning of the facility. International collaborations are always in progress. In 2012, the programs include improving the accuracy of reigns for the dynastic Egypt period and the 14C dating of ancient iron.

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