The effect of redshift-space distortions on projected 2-pt clustering measurements

Although redshift-space distortions only affect inferred distances and not angles, they still distort the projected angular clustering of galaxy samples selected using redshift dependent quantities. From an Eulerian view-point, this effect is caused by the apparent movement of galaxies into or out of the sample. From a Lagrangian view-point, we find that projecting the redshift-space overdensity field over a finite radial distance does not remove all the anisotropic distortions. We investigate this effect, showing that it strongly boosts the amplitude of clustering for narrow samples and can also reduce the significance of baryonic features in the correlation function. We argue that the effect can be mitigated by binning in apparent galaxy pair-centre rather than galaxy position, and applying an upper limit to the radial galaxy separation. We demonstrate this approach, contrasting against standard top-hat binning in galaxy distance, using sub-samples taken from the Hubble Volume simulations. Using a simple model for the radial distribution expected for galaxies from a survey such as the Dark Energy Survey (DES), we show that this binning scheme will simplify analyses that will measure baryon acoustic oscillations within such galaxy samples. Comparing results from different binning schemes has the potential to provide measurements of the amplitude of the redshift-space distortions. Our analysis is relevant for other photometric redshift surveys, including those made by the Panoramic Survey Telescope & Rapid Response System (Pan-Starrs) and the Large Synoptic Survey Telescope (LSST).Comment: 13 pages, 15 figures, accepted by MNRAS, corrected typos, revised argument in section 3, figure added in section 3, results unchange

The Specification Property and Infinite Entropy for Certain Classes of Linear Operators

We study the specification property and infinite topological entropy for two specific types of linear operators: translation operators on weighted Lebesgue function spaces and weighted backward shift operators on sequence F-spaces. It is known from the work of Bartoll, Martinínez-Giménez, Murillo-Arcila (2014), and Peris, that for weighted backward shift operators, the existence of a single non-trivial periodic point is sufficient for specification. We show this also holds for translation operators on weighted Lebesgue function spaces. This implies, in particular, that for these operators, the specification property is equivalent to Devaney chaos. We also show that these forms of chaos imply infinite topological entropy, but that the converse does not hold

A Bunch of Blues / music by J. Paul Wyer; words by H. Alf Kelly

https://egrove.olemiss.edu/sharris_c/1080/thumbnail.jp

Derivation and evaluation of a new extinction coefficient for use with the n-HUT snow emission model

In this study, snow slab data collected from the Arctic Snow Microstructure Experiment were used in conjunction with a six-directional flux coefficient model to calculate individual slab absorption and scattering coefficients. These coefficients formed the basis for a new semiempirical extinction coefficient model, using both frequency and optical diameter as input parameters, along with the complex dielectric constant of snow. Radiometric observations, at 18.7, 21.0, and 36.5 GHz at both horizontal polarization (H-Pol) and vertical polarization (V-Pol), and snowpit data collected as part of the Sodankylä Radiometer Experiment were used to compare and contrast the simulated brightness temperatures produced by the multi-layer Helsinki University of Technology snow emission model, utilizing both the original empirical model and the new semiempirical extinction coefficient model described here. The results show that the V-Pol RMSE and bias values decreased when using the semiempirical extinction coefficient; however, the H-Pol RMSE and bias values increased on two of the lower microwave bands tested. The unbiased RMSE was shown to decrease across all frequencies and polarizations when using the semiempirical extinction coefficient

Longitudinal Analysis of the Gill microbiomes of Atlantic Salmon from four Scottish farms reveals dynamics in bacterial richness and seasonal trends in diversity.

Atlantic Salmon aquaculture in Scotland is a major industry being both Scotland, and the UK’s largest food export. Gill disease, in particular Complex Gill Disease, is a significant challenge of salmon production. It is increasingly understood that the microbiome can influence host health and immunity. Therefore, the objective of the study is to identify and characterise the gill microbiome from stocking to harvest from four sites in Scotland 2018-2020. At each site, mucosal gill swabs were collected fortnightly (sites A &amp; C) or monthly (sites B &amp; G) from eight fish in two pens (n=623 fish). Gill samples underwent 16S rRNA Illumina MiSeq amplicon library preparation and analysis to characterise changes in the gill mucosal communities. Complex Gill disease was identified in sampled fish from each site (A: 20%, B: 11%, C: 24%, G: 13%).At the four sites we showed species richness (alpha diversity) varied over time ranging from 68 ±SD31 to 777 ±SD152 (average 353 ±SD 158). Interestingly, 1100–1500 degree-days after seawater transfer, a distinct decline in species richness and evenness was observed at three of the four sties (A:410 SD± 134 to 276 SD±86 , B:264 SD±67 to 156 SD±71 , C:356 SD±130 to 228 SD±89). In terms of community composition, 1) while there were similarities between all four sites, the communities were statistically different (R = 0.067, P&lt;0.001) from each farm, indicating that sites contributes to differences seen in the microbiome. Within each farm, a seasonal pattern in the microbiome was seen, with community shifts through winter-spring-summer-autumn (A: R2 = 0.11, P&lt;0.001, B: R2 = 0.30, P&lt;0.001, C: R2 = 0.22, P&lt;0.001, G: R2 = 0.11, P&lt;0.001). Proteobacteria dominated the gills (average: 73.6%), with Bacteriodota (average: 18.2%) also highly abundant at all sites. Overall, we have shown changes in the bacterial communities over time and between sites indicating both seasonal and temporal changes in the gill microbiome. Understanding this will help us to better understand the role of the gill microbiome and its role in fish health. <br/

Longitudinal Analysis of the Gill microbiomes of Atlantic Salmon from four Scottish farms reveals dynamics in bacterial richness and seasonal trends in diversity.

Atlantic Salmon aquaculture in Scotland is a major industry being both Scotland, and the UK’s largest food export. Gill disease, in particular Complex Gill Disease, is a significant challenge of salmon production. It is increasingly understood that the microbiome can influence host health and immunity. Therefore, the objective of the study is to identify and characterise the gill microbiome from stocking to harvest from four sites in Scotland 2018-2020. At each site, mucosal gill swabs were collected fortnightly (sites A &amp; C) or monthly (sites B &amp; G) from eight fish in two pens (n=623 fish). Gill samples underwent 16S rRNA Illumina MiSeq amplicon library preparation and analysis to characterise changes in the gill mucosal communities. Complex Gill disease was identified in sampled fish from each site (A: 20%, B: 11%, C: 24%, G: 13%).At the four sites we showed species richness (alpha diversity) varied over time ranging from 68 ±SD31 to 777 ±SD152 (average 353 ±SD 158). Interestingly, 1100–1500 degree-days after seawater transfer, a distinct decline in species richness and evenness was observed at three of the four sties (A:410 SD± 134 to 276 SD±86 , B:264 SD±67 to 156 SD±71 , C:356 SD±130 to 228 SD±89). In terms of community composition, 1) while there were similarities between all four sites, the communities were statistically different (R = 0.067, P&lt;0.001) from each farm, indicating that sites contributes to differences seen in the microbiome. Within each farm, a seasonal pattern in the microbiome was seen, with community shifts through winter-spring-summer-autumn (A: R2 = 0.11, P&lt;0.001, B: R2 = 0.30, P&lt;0.001, C: R2 = 0.22, P&lt;0.001, G: R2 = 0.11, P&lt;0.001). Proteobacteria dominated the gills (average: 73.6%), with Bacteriodota (average: 18.2%) also highly abundant at all sites. Overall, we have shown changes in the bacterial communities over time and between sites indicating both seasonal and temporal changes in the gill microbiome. Understanding this will help us to better understand the role of the gill microbiome and its role in fish health. <br/

Literature and Complicity: Then and Now

In this introduction to “Complicity in Post-1945 Literature: Theory, Aesthetics, Politics,” the editors address the intersections among literature, complicity, and capitalism. We begin by historicizing the concept of complicity and articulating its relationship to colonialism, slavery, and the spread of capitalist world markets. We then track the emergence and development of the field of complicity studies, and examine the role played by literature and aesthetics within that field. We explore the centrality of the Holocaust to the study of complicity, and—via a reading of Roberto Bolaño’s novel 2666—we ask whether new conceptions of complicity are required to address more recent historical developments. Placing complicity studies in dialogue with the proliferating scholarship on neoliberalism, we conclude by naming complicity as the structure of feeling that corresponds to postwar liberalism, and consider the fate of complicity in the neoliberal and post-neoliberal eras

The puzzle of problem-solving efficacy: understanding anxiety among urban children coping with asthma-related and life stress

Children with asthma living in urban environments are at risk for experiencing anxiety by virtue of both social context and health-related stressors. Although the use of active coping strategies is generally associated with more optimal psychosocial functioning, there is evidence that active coping is less helpful in response to uncontrollable or severe stress. Expectations that one can fix a problem that is uncontrollable or insurmountable may create distress. Problem-solving efficacy was examined as a moderator of the association between stress and anxiety among children residing in inner-city neighborhoods. It was hypothesized that children\u27s perceptions of high problem-solving efficacy would exacerbate their vulnerability to stress. Forty-five parent–child dyads were recruited from urban community health centers. Most participants were members of ethnic minority groups. Hierarchical multiple regression analyses revealed main effects of asthma-related stress and life stress on children\u27s anxiety. However, these effects were moderated by problem-solving efficacy. Asthma-related stress and life stress were positively associated with anxiety only for children who had the highest levels of problem-solving efficacy. In other words, positive expectations about the ability to solve problems functioned as a liability for highly stressed children. Implications for psychosocial interventions with at-risk children are discussed