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Determination of Teton Fault slip rates using surface exposure dating of fault-offset glacial landforms in Grand Teton National Park
No full textThe central goal of this project is to establish direct constraints on time-integrated slip rates along the trace of the Teton fault in Grand Teton National Park. The key research strategy is to develop cosmogenic 10Be surface exposure ages of glacial deposits bisected by the fault – in particular lateral moraines along the eastern Teton Range front – and to combine these landform ages with precise geomorphic measurements of postglacial fault scarp offsets on these features as determined from field surveys and analyses of newly available LiDAR data. Time-integrated slip rates on the Teton fault will then be derived from the amount of tectonic displacement on the dated lateral moraines. Improved constraints on the rate of tectonic activity along the Teton fault resulting from this project are anticipated to lead to better-informed geologic hazard assessment in the park and adjacent regions. Furthermore, the moraine chronologies developed in this work will advance our understanding of the late Pleistocene glacial and paleoclimatic history in Grand Teton National Park and more broadly in the northern Rocky Mountains.
Featured photo taken from AMK Ranch photo collection
Ecosystem services provided by soundscapes link people and wildlife: Evidence from mitigation studies in a protected natural area
No full textA growing body of evidence suggests that traffic noise negatively affects wildlife. Protected natural areas are not free from noise exposure, both external to and within park boundaries. Natural soundscapes are important in many aspects of animal life histories, for increasing positive visitor experiences, and for providing psychological ecosystem services. To examine the use of signs as an effective traffic noise mitigation strategy, we experimentally altered speed limits from 45 mph to 25 mph, with additional educational signage, along the Oxbow Bend traffic corridor in Grand Teton National Park, USA. We continuously recorded sound levels between alternating week-long blocks while conducting avian point counts at each station. We detected 2,217 individuals of 48 species across all stations throughout the study. To assess visitor experiences with the soundscapes and visitor attitudes towards sign use and management strategies, we conducted stated-choice intercept surveys along a park turnout within the experimental corridor. We administered 471 surveys at an 82% response rate. Future data will evaluate impacts of traffic noise on avian abundance and distributions, visitor attitudes towards mitigation strategies, and the potential coupling between human and natural systems via the soundscape.
Featured photo from Figure 2 in report
Twenty Years of Working-Class Studies: Tensions, Values, and Core Questions
No full textFrom the beginning Working-Class Studies has been a balancing act – between academic and activist work, among class and other analytic and social categories, among ways of defining and studying class. Twenty years in, we have not resolved the tensions among the disparate approaches to and elements of this field. And that,we would argue, is one of our strengths. Working-Class Studies is a dynamic and contested terrain of multiple methodologies and academic disciplines. While this means we sometimes repeat old debates, because we haven’t resolved them and because new people join the fray, as a field we benefit from the complexity and openendedness around a few core issues
Paradise Lost? Patterns and Precarity in Working-Class Academic Narratives
No full textThrough an analysis of eight collections of autoethnographic essays written by working-class academics and published over the span of thirty-two years, I identify stable themes and emergent patterns in lived experiences. Some broad and stable themes include a sense of alienation, lack of cultural capital, encountering stereotypes and microaggressions, experiencing survivor guilt and the impostor syndrome, and struggling to pass in a middle-class culture that values ego and networking. Two new and troubling patterns are crippling amounts of student debt and the increased exploitation of adjunct labor. I emphasize the importance of considering social class background as a form of diversity in academia and urge continued research on the experiences of working-class academics
Signless Laplacian spectral characterization of some joins
No full textThe join of two disjoint graphs G and H, denoted by G ⨠H, is the graph obtained by joining each vertex of G to each vertex of H. In this paper, the signless Laplacian characteristic polynomial of the join of two graphs is first formulated. And then, a lower bound for the i-th largest signless Laplacian eigenvalue of a graph is given. Finally, it is proved that G ⨠K_m, where G is an (n â 2)-regular graph on n vertices, and K_n ⨠K_2 except for n = 3, are determined by their signless Laplacian spectra
Sign Characteristics of Regular Hermitian Matrix Pencils under Generic Rank-1 and Rank-2 Perturbations
No full textThe spectral behavior of regular Hermitian matrix pencils is examined under certain structure-preserving rank-1 and rank-2 perturbations. Since Hermitian pencils have signs attached to real (and infinite) blocks in canonical form, it is not only the Jordan structure but also this so-called sign characteristic that needs to be examined under perturbation. The observed effects are as follows: Under a rank-1 or rank-2 perturbation, generically the largest one or two, respectively, Jordan blocks at each eigenvalue lambda are destroyed, and if lambda is an eigenvalue of the perturbation, also one new block of size one is created at lambda. If lambda is real (or infinite), additionally all signs at lambda but one or two, respectively, that correspond to the destroyed blocks, are preserved under perturbation. Also, if the potential new block of size one is real, its sign is in most cases prescribed to be the sign that is attached to the eigenvalue lambda in the perturbation
Stationary vectors of stochastic matrices subject to combinatorial constraints
No full textGiven a strongly connected directed graph D, let S_D denote the set of all stochastic matrices whose directed graph is a spanning subgraph of D. We consider the problem of completely describing the set of stationary vectors of irreducible members of S_D. Results from the area of convex polytopes and an association of each matrix with an undirected bipartite graph are used to derive conditions which must be satisfied by a positive probability vector x in order for it to be admissible as a stationary vector of some matrix in S_D. Given some admissible vector x, the set of matrices in S_D that possess x as a stationary vector is also characterised
Graphs with few distinct distance eigenvalues irrespective of the diameters
No full textThe distance matrix of a simple connected graph is , where is the distance between th and th vertices of . The multiset of all eigenvalues of is known as the distance spectrum of . Lin et al.(On the distance spectrum of graphs. \newblock {\em Linear Algebra Appl.}, 439:1662-1669, 2013) asked for existence of graphs other than strongly regular graphs and some complete -partite graphs having exactly three distinct distance eigenvalues. In this paper some classes of graphs with arbitrary diameter and satisfying this property is constructed. For each families of graphs that contain graphs of each diameter grater than is constructed with the property that the distance matrix of each graph in the families has exactly distinct eigenvalues. While making these constructions we have found the full distance spectrum of square of even cycles, square of hypercubes, corona of a transmission regular graph with , and strong product of an arbitrary graph with $K_n
Extension of Bessel sequences to oblique dual frame sequences and the minimal projection
No full textAn extension of two Bessel sequences to oblique dual frame sequences and its applications to shift-invariant spaces are considered. The best-known situation where this kind of extension is necessary is the construction of a pair of biorthogonal multiresolution analyses, where two generating sets whose shifts are only assumed to be Bessel sequences are given. This extension naturally leads to consideration of the âminimal projectionâ extending two closed subspaces. The existence or non-existence of the minimal projection is discussed
Sign patterns that require eventual exponential nonnegativity
No full textSign patterns that require exponential nonnegativity are characterized. A set of conditions necessary for a sign pattern to require eventual exponential nonnegativity are established. It is shown that these conditions are also sufficient for an upper triangular sign pattern to require eventual exponential nonnegativity and it is conjectured that these conditions are both necessary and sufficient for any sign pattern to require eventual exponential nonnegativity. It is also shown that the maximum number of negative entries in a sign pattern that requires eventual exponential nonnegativity is (nâ1)(nâ2)/2 +