In this work,two approaches,based on the certified Reduced Basis method,have been developed for simulating the movement of nuclear reactor control rods,in time-dependent non-coercive settings featuring a 3D geometrica...In this work,two approaches,based on the certified Reduced Basis method,have been developed for simulating the movement of nuclear reactor control rods,in time-dependent non-coercive settings featuring a 3D geometrical framework.In particular,in a first approach,a piece-wise affine transformation based on subdomains division has been implemented for modelling the movement of one control rod.In the second approach,a“staircase”strategy has been adopted for simulating themovement of all the three rods featured by the nuclear reactor chosen as case study.The neutron kinetics has been modelled according to the so-called multi-group neutron diffusion,which,in the present case,is a set of ten coupled parametrized parabolic equations(two energy groups for the neutron flux,and eight for the precursors).Both the reduced order models,developed according to the two approaches,provided a very good accuracy comparedwith high-fidelity results,assumed as“truth”solutions.At the same time,the computational speed-up in the Online phase,with respect to the fine“truth”finite element discretization,achievable by both the proposed approaches is at least of three orders of magnitude,allowing a real-time simulation of the rod movement and control.展开更多
The use of coercion to alter behavior in persons with intellectual and other developmental disabilities has a long history. Despite the work of leaders in the development of Positive Behaviour Support (PBS), the use o...The use of coercion to alter behavior in persons with intellectual and other developmental disabilities has a long history. Despite the work of leaders in the development of Positive Behaviour Support (PBS), the use of chemical, mechanical, physical or personal, and environmental restraints continues, resulting in traumatization, physical and emotional harm, and in some instances, death. When coercion is used, the trust between people breaks down, and the lack of trust is reinforced by the power differentials present when coercion occurs. Social justice provides an avenue for rebalancing power and regaining trust, but people affected by disabilities have historically been excluded from theories of social justice and, in some cases, do not fall within the definition of what it means to be a person in the paradigms put forth by a number of different authors. The term non-coercive has been used in an attempt to reframe behavior change theories and practices, but this term describes the absence of negative circumstances and interventions, rather than the presence of positive and affirming interactions which improve the quality of life of all stakeholders.展开更多
基金We acknowledge CINECA and Regione Lombardia LISA computational initiative,for the availability of high performance computing resources and support.G.Rozza acknowledges INDAM-GNCS national activity group and NOFYSAS program of SISSA.
文摘In this work,two approaches,based on the certified Reduced Basis method,have been developed for simulating the movement of nuclear reactor control rods,in time-dependent non-coercive settings featuring a 3D geometrical framework.In particular,in a first approach,a piece-wise affine transformation based on subdomains division has been implemented for modelling the movement of one control rod.In the second approach,a“staircase”strategy has been adopted for simulating themovement of all the three rods featured by the nuclear reactor chosen as case study.The neutron kinetics has been modelled according to the so-called multi-group neutron diffusion,which,in the present case,is a set of ten coupled parametrized parabolic equations(two energy groups for the neutron flux,and eight for the precursors).Both the reduced order models,developed according to the two approaches,provided a very good accuracy comparedwith high-fidelity results,assumed as“truth”solutions.At the same time,the computational speed-up in the Online phase,with respect to the fine“truth”finite element discretization,achievable by both the proposed approaches is at least of three orders of magnitude,allowing a real-time simulation of the rod movement and control.
文摘The use of coercion to alter behavior in persons with intellectual and other developmental disabilities has a long history. Despite the work of leaders in the development of Positive Behaviour Support (PBS), the use of chemical, mechanical, physical or personal, and environmental restraints continues, resulting in traumatization, physical and emotional harm, and in some instances, death. When coercion is used, the trust between people breaks down, and the lack of trust is reinforced by the power differentials present when coercion occurs. Social justice provides an avenue for rebalancing power and regaining trust, but people affected by disabilities have historically been excluded from theories of social justice and, in some cases, do not fall within the definition of what it means to be a person in the paradigms put forth by a number of different authors. The term non-coercive has been used in an attempt to reframe behavior change theories and practices, but this term describes the absence of negative circumstances and interventions, rather than the presence of positive and affirming interactions which improve the quality of life of all stakeholders.
