Unsteady transonic flow using Euler equations

An implicit, two factor, split flux, finite volume Euler equations solution algorithms is applied to the time accurate solution of transonic flow about an NACA 0012 airfoil and a rectangular planform supercritical wing undergoing pitch oscillations. Accuracy for Courant numbers greater than one is analyzed. Freezing the flux Jacobians can result in significant savings for steady state solutions; the accuracy of freezing flux Jacobians for unsteady results is investigated. The Euler algorithm results are compared with experimental results for an NACA 0012 and a rectangular planform supercritical wing

Complete loss of case and gender within two generations: evidence from Stamford Hill Hasidic Yiddish

Yiddish was the everyday language spoken by most Central and East European Jews during the last millennium. As a result of the extreme loss of speakers during the Holocaust, subsequent geographic dispersal, and lack of institutional support, Yiddish is now an endangered language. Yet it continues to be a native and daily language for Haredi (strictly Orthodox) Jews, who live in close-knit communities worldwide. We have conducted the first study of the linguistic characteristics of the Yiddish spoken in the community in London’s Stamford Hill. While Krogh (in: Aptroot, Aptroot et al. (eds.) Leket: Yiddish studies today, Düsseldorf University Press, Düsseldorf, pp 483–506, 2012), Assouline (in: Aptroot, Hansen (eds.) Yiddish language structures, De Gruyter Mouton, Berlin, pp 39–62, 2014), and Sadock and Masor (J Jew Lang 6(1):89–110, 2018), investigating other Hasidic Yiddish-speaking communities, observe what they describe as morphological syncretism, in this paper we defend the claim that present-day Stamford Hill Hasidic Yiddish lacks morphological case and gender completely. We demonstrate that loss of morphological case and gender is the result of substantial language change over the course of two generations: while the case and gender system of the spoken medium was already beginning to undergo morphological syncretism and show some variation prior to World War II, case and gender distinctions were clearly present in the mental grammar of both Hasidic and non-Hasidic speakers of the relevant Yiddish dialects at that stage. We conclude the paper by identifying some of the language-internal, sociolinguistic and historical factors that have contributed to such rapid and pervasive language change, and compare the developments in Stamford Hill Hasidic Yiddish to those of minority German dialects in North America

Translating Covid-19 information into Yiddish for the UK Hasidic community

This article documents a recent project translating COVID-19 information into Yiddish for the benefit of the Hasidic Jewish communities in London’s Stamford Hill and in Manchester in the UK. The translation work developed as a response to the urgent need for Yiddish-language resources specifically designed for the Hasidic community near the beginning of the pandemic. The translations were undertaken by a team consisting of linguists and native speakers of Hasidic Yiddish and took place within the framework of a research project funded by the UK Arts and Humanities Research Council, dedicated to linguistic and sociolinguistic analysis of contemporary Hasidic Yiddish worldwide. In this article we discuss the sociolinguistic background to the translations and investigate the reasons why they were so urgently needed, before going on to address the issues encountered during the course of the translation process and the decisions taken in order to resolve them. These issues include the type of Yiddish chosen for the translations, the translation of medical terminology, gender-based linguistic differences affecting the translations, and specific cultural considerations that needed to be taken into account

Unusual features in the nonlinear microwave surface impedance of Y-Ba-Cu-O thin films

Striking features have been found in the nonlinear microwave (8 GHz) surface impedance $Z_s=R_s + jX_s$ of high-quality YBaCuO thin films with comparable low power characteristics [$R_{res}\sim 35--60 \mu\Omega$ and $\lambda_L(15 K)\sim 130--260 nm$]. The surface resistance $R_s$ is found to increase, decrease, or remain independent of the microwave field $H_{rf}$ (up to 60 mT) at different temperatures and for different samples. However, the surface reactance $X_s$ always follows the same functional form. Mechanisms which may be responsible for the observed variations in $R_s$ and $X_s$ are briefly discussed.Comment: 4 pages, 4 figure

Whole-Genome Sequencing and Concordance Between Antimicrobial Susceptibility Genotypes and Phenotypes of Bacterial Isolates Associated with Bovine Respiratory Disease.

Extended laboratory culture and antimicrobial susceptibility testing timelines hinder rapid species identification and susceptibility profiling of bacterial pathogens associated with bovine respiratory disease, the most prevalent cause of cattle mortality in the United States. Whole-genome sequencing offers a culture-independent alternative to current bacterial identification methods, but requires a library of bacterial reference genomes for comparison. To contribute new bacterial genome assemblies and evaluate genetic diversity and variation in antimicrobial resistance genotypes, whole-genome sequencing was performed on bovine respiratory disease-associated bacterial isolates (Histophilus somni, Mycoplasma bovis, Mannheimia haemolytica, and Pasteurella multocida) from dairy and beef cattle. One hundred genomically distinct assemblies were added to the NCBI database, doubling the available genomic sequences for these four species. Computer-based methods identified 11 predicted antimicrobial resistance genes in three species, with none being detected in M. bovis While computer-based analysis can identify antibiotic resistance genes within whole-genome sequences (genotype), it may not predict the actual antimicrobial resistance observed in a living organism (phenotype). Antimicrobial susceptibility testing on 64 H. somni, M. haemolytica, and P. multocida isolates had an overall concordance rate between genotype and phenotypic resistance to the associated class of antimicrobials of 72.7% (P < 0.001), showing substantial discordance. Concordance rates varied greatly among different antimicrobial, antibiotic resistance gene, and bacterial species combinations. This suggests that antimicrobial susceptibility phenotypes are needed to complement genomically predicted antibiotic resistance gene genotypes to better understand how the presence of antibiotic resistance genes within a given bacterial species could potentially impact optimal bovine respiratory disease treatment and morbidity/mortality outcomes

Changes In Apparent Molar Water Volume and DKP Solubility Yield Insights on the Hofmeister Effect

This study examines the properties of a 4 × 2 matrix of aqueous cations and anions at concentrations up to 8.0 M. The apparent molar water volume, as calculated by subtracting the mass and volume of the ions from the corresponding solution density, was found to exceed the molar volume of ice in many concentrated electrolyte solutions, underscoring the nonideal behavior of these systems. The solvent properties of water were also analyzed by measuring the solubility of diketopiperazine (DKP) in 2.000 M salt solutions prepared from the same ion combinations. Solution rankings for DKP solubility were found to parallel the Hofmeister series for both cations and anions, whereas molar water volume concurred with the cation series only. The results are discussed within the framework of a desolvation energy model that attributes solute-specific changes in equilibria to solute-dependent changes in the free energy of bulk water

Materializing digital collecting: an extended view of digital materiality

If digital objects are abundant and ubiquitous, why should consumers pay for, much less collect them? The qualities of digital code present numerous challenges for collecting, yet digital collecting can and does occur. We explore the role of companies in constructing digital consumption objects that encourage and support collecting behaviours, identifying material configuration techniques that materialise these objects as elusive and authentic. Such techniques, we argue, may facilitate those pleasures of collecting otherwise absent in the digital realm. We extend theories of collecting by highlighting the role of objects and the companies that construct them in materialising digital collecting. More broadly, we extend theories of digital materiality by highlighting processes of digital material configuration that occur in the pre-objectification phase of materialisation, acknowledging the role of marketing and design in shaping the qualities exhibited by digital consumption objects and consequently related consumption behaviours and experiences

Single Electron Transistors

Contains description of one research project.Joint Services Electronics Program Contract DAAL03-89-C-0001Joint Services Electronics Program Contract DAAL03-92-C-0001National Science Foundation Grant ECS 88-1325