Recent Work (1978)

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# Your search: "author:"Zimmermann, A""

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## Scholarly Works (132 results)

Akin to other mineralized tissues, human cortical bone can resist deformation and fracture due to the nature of its hierarchical structure, which spans the molecular to macroscopic length-scales. Deformation at the smallest scales, mainly through the composite action of the mineral and collagen, contributes to bone?s strength or intrinsic fracture resistance, while crack-tip shielding mechanisms active on the microstructural scale contribute to the extrinsic fracture resistance once cracking begins. The efficiency with which these structural features can resist fracture at both small and large length-scales becomes severely degraded with such factors as aging, irradiation and disease. Indeed aging and irradiation can cause changes to the cross-link profile at fibrillar length-scales as well as changes at the three orders of magnitude larger scale of the osteonal structures, both of which combine to inhibit the bone?s overall resistance to the initiation and growth of cracks.

For any truncated path algebra Λ, we give a structural description of the modules in the categories
$${\mathcal{P}^{<\infty}(\Lambda\text{-}{\rm mod})}$$
and
$${\mathcal{P}^{<\infty}(\Lambda\text{-}{\rm mod})}$$
, consisting of the finitely generated (resp. arbitrary) Λ-modules of finite projective dimension. We deduce that these categories are contravariantly finite in Λ−mod and Λ-Mod, respectively, and determine the corresponding minimal
$${\mathcal{P}^{<\infty}}$$
-approximation of an arbitrary Λ-module from a projective presentation. In particular, we explicitly construct—based on the Gabriel quiver Q and the Loewy length of Λ—the basic strong tilting module Λ
T (in the sense of Auslander and Reiten) which is coupled with
$${\mathcal{P}^{<\infty}(\Lambda\text{-}{\rm mod})}$$
in the contravariantly finite case. A main topic is the study of the homological properties of the corresponding tilted algebra
$${\tilde{\Lambda} = {\rm End}_\Lambda(T)^{\rm op}}$$
, such as its finitistic dimensions and the structure of its modules of finite projective dimension. In particular, we characterize, in terms of a straightforward condition on Q, the situation where the tilting module
$${T_{\tilde{\Lambda}}}$$
is strong over
$${\tilde{\Lambda}}$$
as well. In this Λ-
$${\tilde{\Lambda}}$$
-symmetric situation, we obtain sharp results on the submodule lattices of the objects in
$${\mathcal{P}^{<\infty}({\rm Mod}\text{-}\tilde{\Lambda})}$$
, among them a certain heredity property; it entails that any module in
$${\mathcal{P}^{<\infty}({\rm Mod}\text{-}\tilde{\Lambda})}$$
is an extension of a projective module by a module all of whose simple composition factors belong to
$${\mathcal{P}^{<\infty}({\rm Mod}\text{-}\tilde{\Lambda})}$$
.

Recent Work (2020)

This journal is © The Royal Society of Chemistry. Structure characterization and classification is frequently based on local environment information of all or selected atomic sites in the crystal structure. Therefore, reliable and robust procedures to find coordinated neighbors and to evaluate the resulting coordination pattern (e.g., tetrahedral, square planar) are critically important for both traditional and machine learning approaches that aim to exploit site or structure information for predicting materials properties. Here, we introduce new local structure order parameters (LoStOPs) that are specifically designed to rapidly detect highly symmetric local coordination environments (e.g., Platonic solids such as a tetrahedron or an octahedron) as well as less symmetric ones (e.g., Johnson solids such as a square pyramid). Furthermore, we introduce a Monte Carlo optimization approach to ensure that the different LoStOPs are comparable with each other. We then apply the new local environment descriptors to define site and structure fingerprints and to measure similarity between 61 known coordination environments and 40 commonly studied crystal structures, respectively. After extensive testing and optimization, we determine the most accurate structure similarity assessment procedure to compute all 2.45 billion structure similarities between each pair of the ≈70000 materials that are currently present in the Materials Project database.

We summarize Session F of the ECLOUD 04 workshop. This session was dedicated to beam instabilities driven by electron cloud. Specifically, we discuss the principal observations of electron-cloud instabilities, analytical models, simulation codes and the next steps that need to be taken to arrive at a predictive theory.

Recent Work (1966)

Recent Work (2016)

© 2016 American Chemical Society. Mature applications such as fluid catalytic cracking and hydrocracking rely critically on early zeolite structures. With a data-driven approach, we find that the discovery of exceptional zeolite framework types around the new millennium was spurred by exciting new utilization routes. The promising processes have yet not been successfully implemented ("valley of death" effect), mainly because of the lack of thermal stability of the crystals. This foreshadows limited deployability of recent zeolite discoveries that were achieved by novel crystal synthesis routes.