1,143 research outputs found
The Wee Hoose \u27Mang The Heather
https://digitalcommons.library.umaine.edu/mmb-vp/5796/thumbnail.jp
The Same As His Faither Did Before Him
https://digitalcommons.library.umaine.edu/mmb-vp/4767/thumbnail.jp
Moving mesh Virtual Element Methods
This thesis explores the development and analysis of moving mesh Virtual Element Methods for partial differential equations on time-dependent domains. This thesis presents the first moving mesh method to purely use the Virtual Element Method, an isoparametric Virtual Element Method for approximating partial differential equations on curved domains and a high-order Arbitrary Lagrangian-Eulerian Virtual Element Method for problems on time-dependent domains with moving boundaries. Each contribution successfully demonstrates the applicability and accuracy of Virtual Element Methods in existing moving mesh algorithms, achieving similar orders of accuracy compared to classical Finite Element Method approaches. The results suggest that the flexibility of moving mesh methods can be greatly improved by incorporating more general mesh structures, including polygons and curved-edged polygons, proving the Virtual Element Method offers an effective extension to classical approaches. This work provides a foundation for future research in Virtual Element Methods for more complex problems on time-dependent domains and developing the analysis to support proposed moving mesh methods
CLIC e+e- Linear Collider Studies
This document provides input from the CLIC e+e- linear collider studies to
the update process of the European Strategy for Particle Physics. It is
submitted on behalf of the CLIC/CTF3 collaboration and the CLIC physics and
detector study. It describes the exploration of fundamental questions in
particle physics at the energy frontier with a future TeV-scale e+e- linear
collider based on the Compact Linear Collider (CLIC) two-beam acceleration
technique. A high-luminosity high-energy e+e- collider allows for the
exploration of Standard Model physics, such as precise measurements of the
Higgs, top and gauge sectors, as well as for a multitude of searches for New
Physics, either through direct discovery or indirectly, via high-precision
observables. Given the current state of knowledge, following the observation of
a \sim125 GeV Higgs-like particle at the LHC, and pending further LHC results
at 8 TeV and 14 TeV, a linear e+e- collider built and operated in
centre-of-mass energy stages from a few-hundred GeV up to a few TeV will be an
ideal physics exploration tool, complementing the LHC. Two example scenarios
are presented for a CLIC accelerator built in three main stages of 500 GeV, 1.4
(1.5) TeV, and 3 TeV, together with the layout and performance of the
experiments and accompanied by cost estimates. The resulting CLIC physics
potential and measurement precisions are illustrated through detector
simulations under realistic beam conditions.Comment: Submitted to the European Strategy Preparatory Grou
Characteristics of infinite dimensional vector spaces
The study of finite dimensional vector spaces has been logically
extended to that of infinite dimensional vector spaces. Of fundamental
importance to this study is the relationship between sets which span a
vector space, basis sets for such a space, and linearly independent sets
within the space. Without recourse to the finite dimensional case, a
new proof is presented to show this relationship. A corollary to this
is the most important result that every basis for a vector space has the
same cardinal number.http://www.archive.org/details/characteristicso00wellMajor, United States Marine Corp
Moving mesh Virtual Element Methods
This thesis explores the development and analysis of moving mesh Virtual Element Methods for partial differential equations on time-dependent domains. This thesis presents the first moving mesh method to purely use the Virtual Element Method, an isoparametric Virtual Element Method for approximating partial differential equations on curved domains and a high-order Arbitrary Lagrangian-Eulerian Virtual Element Method for problems on time-dependent domains with moving boundaries. Each contribution successfully demonstrates the applicability and accuracy of Virtual Element Methods in existing moving mesh algorithms, achieving similar orders of accuracy compared to classical Finite Element Method approaches. The results suggest that the flexibility of moving mesh methods can be greatly improved by incorporating more general mesh structures, including polygons and curved-edged polygons, proving the Virtual Element Method offers an effective extension to classical approaches. This work provides a foundation for future research in Virtual Element Methods for more complex problems on time-dependent domains and developing the analysis to support proposed moving mesh methods
Surface Tethered Epidermal Growth Factor Protects Proliferating and Differentiating Multipotential Stromal Cells from FasL-Induced Apoptosis
Multipotential stromal cells or mesenchymal stem cells (MSCs) have been proposed as aids in regenerating bone and adipose tissues, as these cells form osteoblasts and adipocytes. A major obstacle to this use of MSC is the initial loss of cells postimplantation. This cell death in part is due to ubiquitous nonspecific inflammatory cytokines such as FasL generated in the implant site. Our group previously found that soluble epidermal growth factor (sEGF) promotes MSC expansion. Furthermore, tethering EGF (tEGF) onto a two-dimensional surface altered MSC responses, by restricting epidermal growth factor receptor (EGFR) to the cell surface, causing sustained activation of EGFR, and promoting survival from FasL-induced death. sEGF by causing internalization of EGFR does not support MSC survival. However, for tEGF to be useful in bone regeneration, it needs to allow for MSC differentiation into osteoblasts while also protecting emerging osteoblasts from apoptosis. tEGF did not block induced differentiation of MSCs into osteoblasts, or adipocytes, a common default MSC-differentiation pathway. MSC-derived preosteoblasts showed increased Fas levels and became more susceptible to FasL-induced death, which tEGF prevented. Differentiating adipocytes underwent a reduction in Fas expression and became resistant to FasL-induced death, with tEGF having no further survival effect. tEGF protected undifferentiated MSC from combined insults of FasL, serum deprivation, and physiologic hypoxia. Additionally, tEGF was dominant in the face of sEGF to protect MSC from FasL-induced death. Our results suggest that MSCs and differentiating osteoblasts need protective signals to survive in the inflammatory wound milieu and that tEGF can serve this function.National Institute of General Medical Sciences (U.S.) (GM069668)National Institute of Dental and Craniofacial Research (U.S.) (DE019523
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