Residual stresses in as-manufactured TRISO Coated Particle Fuel (CPF)

TRistructural ISOtropic coated particle fuels (TRISO CPF) have been developed as a possible fuel solution for high temperature nuclear reactors, which offer the possibility of nuclear cogeneration-powered industrial facilities and hydrogen production. A finite element model was developed to simulate the fabrication process of TRISO particles. Understanding the initial stress and bonding state of the layers is crucial in predicting performance and failure in service, however this factor has not received an in depth consideration in the available literature. The simulations of a fully bonded model of TRISO (layers perfectly attached to each other) revealed the presence of high values of tensile hoop stresses in the inner fuel kernel (up to 250 MPa, sufficient to cause fracture in UO2) and even higher compressive stresses (up to 600 MPa) in the silicon carbide layer. Simulations conducted without bonding between kernel and buffer found the residual stress state to be consistently more relaxed with respect to the fully bonded model. This was most evident in the radial stress, which drops to less than 10 MPa (tensile or compressive) throughout the particle. In the hoop direction, compression of 150 MPa remained in the SiC layer. Such results are consistent with the empirical evidence of the occurrence of kernel-buffer debonding during the fabrication of TRISO particles. Finally, a brief investigation of the effect of ovality on the model with kernel-buffer debonding showed an overall increase in the magnitude of the hoop stress in the SiC and PyC layers in a flat spot caused by reduced buffer material

Bringing People Back into Public Health Data: Community Feedback on a Set of Visualization Tools - Summary Report

This course-based study is a product of the University of Denver’s Spring 2022 The Social Determination of Health (ANTH 2424) class. The study aimed to understand how well a set of public health visualization tools tells the data stories about people in Colorado, and about important public health problems. For this, a team of almost sixty undergraduate students taking the class, coordinated by three graduate teaching assistants, and directed by the course instructor interviewed a total of fifty-six people from Colorado, qualitatively analyzed those interviews, and wrote reports that draw conclusions and recommendations

Agonistic democracy

This pioneering book delivers a systematic account of agonistic democracy, and a much-needed analysis of the core components of agonism: pluralism, tragedy, and the value of conflict. It also traces the history of these ideas, identifying the connections with republicanism and with Greek antiquity. Mark Wenman presents a critical appraisal of the leading contemporary proponents of agonism and, in a series of well-crafted and comprehensive discussions, brings these thinkers into debate with one another, as well as with the post-structuralist and continental theorists who influence them. Wenman draws extensively on Hannah Arendt, and stresses the creative power of human action as augmentation and revolution. He also reworks Arendt's discussion of reflective judgement to present an alternative style of agonism, one where the democratic contest is linked to the emergence of a militant form of cosmopolitanism, and to prospects for historical change in the context of neoliberal globalisation.</jats:p