Quasi-static Free-Boundary Equilibrium of Toroidal Plasma with CEDRES++: Computational Methods and Applications

International audienceWe present a comprehensive survey of the various computational methods in CEDRES++ for finding equilibria of toroidal plasma. Our focus is on free-boundary plasma equilib-ria, where either poloidal field coil currents or the temporal evolution of voltages in poloidal field circuit systems are given data. Centered around a piecewise linear finite element representation of the poloidal flux map, our approach allows in large parts the use of established numerical schemes. The coupling of a finite element method and a boundary element method gives consistent numerical solutions for equilibrium problems in unbounded domains. We formulate a new Newton method for the discretized non-linear problem to tackle the various non-linearities, including the free plasma boundary. The Newton method guarantees fast convergence and is the main building block for the inverse equilibrium problems that we can handle in CEDRES++ as well. The inverse problems aim at finding either poloidal field coil currents that ensure a desired shape and position of the plasma or at finding the evolution of the voltages in the poloidal field circuit systems that ensure a prescribed evolution of the plasma shape and position. We provide equilibrium simulations for the tokamaks ITER and WEST to illustrate the performance of CEDRES++ and its application areas

Forest conservation delivers highly variable coral reef conservation outcomes

Coral reefs are threatened by human activities on both the land (e.g., deforestation) and the sea (e.g., overfishing). Most conservation planning for coral reefs focuses on removing threats in the sea, neglecting management actions on the land. A more integrated approach to coral reef conservation, inclusive of land–sea connections, requires an understanding of how and where terrestrial conservation actions influence reefs. We address this by developing a land–sea planning approach to inform fine-scale spatial management decisions and test it in Fiji. Our aim is to determine where the protection of forest can deliver the greatest return on investment for coral reef ecosystems. To assess the benefits of conservation to coral reefs, we estimate their relative condition as influenced by watershed-based pollution and fishing. We calculate the cost-effectiveness of protecting forest and find that investments deliver rapidly diminishing returns for improvements to relative reef condition. For example, protecting 2% of forest in one area is almost 500 times more beneficial than protecting 2% in another area, making prioritization essential. For the scenarios evaluated, relative coral reef condition could be improved by 8–58% if all remnant forest in Fiji were protected rather than deforested. Finally, we determine the priority of each coral reef for implementing a marine protected area when all remnant forest is protected for conservation. The general results will support decisions made by the Fiji Protected Area Committee as they establish a national protected area network that aims to protect 20% of the land and 30% of the inshore waters by 2020. Although challenges remain, we can inform conservation decisions around the globe by tackling the complex issues relevant to integrated land–sea planning

Paying God’s Love Forward: A Hospital Chaplain’s Perspective

This paper, written from the perspective of a hospital chaplain, reflects on how the concept of paying God’s love forward and engaging in selfless acts toward others benefits not only the receiver but also profoundly impacts the spiritual formation of the giver. By fostering a stronger connection with God and promoting spiritual growth, these acts transform the giver’s relationship with the divine, deepening their faith and sense of purpose

There\u27s No One Like The Old Folks After All

https://digitalcommons.library.umaine.edu/mmb-vp/6423/thumbnail.jp

Putting Archaeology and Anthropology into Schools: A 2019 Update

Our 2012 article, “Putting Anthropology Into Schools,” argued that integrating anthropology and archaeology into K-12 schools must involve teacher preparation, state certification requirements, and in-service training. National anthropology and archaeology organizations’ decades-long push for the integration of their disciplines into schools was outlined but assessed as relatively limited compared to successful efforts in psychology, sociology, and economics. Some progress did occur, traced primarily to the National Science Foundation and other funders, alongside committed individuals with well-developed curriculum materials. Our 2019 publication includes the original article followed by an UPDATE outlining developments since 2012. Reports from the National Academies and the American Anthropological Association are discussed alongside efforts bythe Society for American Archaeology and the Archaeological Institute of America. Highlights also include initiatives to align anthropology and archaeology with national standards and global education goals; online resources for teachers and homeschooling parents; and informal, out-of-school opportunities including museum programs

A screw syzygy with applications to robot singularity computation

A syzygy is a relation between invariants. In this paper a syzygy is presented between invariants of sequences of six screws under the action of the Euclidean group. This relation is useful in simplifying the computation of the determinant of a robot Jacobian and hence can be used to investigate the singularities of robot manipulators. © Springer Science+Business Media B.V. 2008