A New Reflecting Microscope Objective with Two Concentric Spherical Mirrors

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Adjoint Computation for Hypersurfaces Using Formal Desingularizations

We show how to use formal desingularizations (defined earlier by the first author) in order to compute the global sections (also called adjoints) of twisted pluricanonical sheaves. These sections define maps that play an important role in the birational classification of schemes.Comment: 10 page

Cryogenic wind tunnel technology. A way to measurement at higher Reynolds numbers

The goals, design, problems, and value of cryogenic transonic wind tunnels being developed in Europe are discussed. The disadvantages inherent in low-Reynolds-number (Re) wind tunnel simulations of aircraft flight at high Re are reviewed, and the cryogenic tunnel is shown to be the most practical method to achieve high Re. The design proposed for the European Transonic Wind tunnel (ETW) is presented: parameters include cross section. DISPLAY 83A46484/2 = 4 sq m, operating pressure = 5 bar, temperature = 110-120 K, maximum Re = 40 x 10 to the 6th, liquid N2 consumption = 40,000 metric tons/year, and power = 39,5 MW. The smaller Cologne subsonic tunnel being adapted to cryogenic use for preliminary studies is described. Problems of configuration, materials, and liquid N2 evaporation and handling and the research underway to solve them are outlined. The benefits to be gained by the construction of these costly installations are seen more in applied aerodynamics than in basic research in fluid physics. The need for parallel development of both high Re tunnels and computers capable of performing high-Re numerical analysis is stressed

Common Bulkhead Joint Development and Evaluation Final Report

Optimized composite welded joint design for Saturn booster common bulkhea

The Call of the Anthropocene

In late 2012 a communications satellite called EchoStar XVI launched into space from Kazakhstan where it remains in a geostationary orbit around Earth. The satellite contains artist and geographer Trevor Paglen’s The Last Pictures, a collection of one hundred images, sourced from libraries and artists, microetched onto a gold-plated disc. Paglen’s project is both a continuation of, and a critical response to, the notion of the time capsule as a means of delivering, either to a terrestrial future or to some extraterrestrial destination, an abbreviated representative sample of “civilization.” The utopianism that motivates many time-capsule projects, whether it is articulated through a belief in the power to communicate with a distant future or with some cosmically remote intelligence, is also a manifestation, this article argues, of progressive modernity’s commitment to timekeeping—to the successful capture and command, interpretation and anticipation, of past and future times. Paglen’s project is considered here as a retort to the repressions and exclusions that underwrite the optimism of the conventional capsule; The Last Pictures is the futureless call of the Anthropocene

High Formalism: The aerial view and the colour field

Laura Kurgan’s Monochrome Landscapes (2004), first exhibited in the Whitney Museum of American Art in New York City, consists of four oblong Cibachrome prints derived from digital files sourced from the commercial Ikonos and QuickBird satellites. The prints are ostensibly flat, depthless fields of white, green, blue, and yellow, yet the captions provided explain that the sites represented are related to contested military, industrial, and cartographic practices. In Kurgan’s account of Monochrome Landscapes she explains that it is in dialogue with another work from the Whitney by abstract artist Ellsworth Kelly. This article pursues the relationship between formalist abstraction and satellite imaging in order to demonstrate how formalist strategies aimed at producing an immediate retinal response are bound up with contemporary uses of digital information and the truth claims such information can be made to substantiate

Experience, expertise and expert-performance research in public accounting

Bibliography: p. [22-25]

On the Beach

The phrase "on the beach" originates as naval slang for being between assignments or unemployed and was used as the title for Nevil Shute's bestselling novel of 1957 about the last remaining survivors of a global nuclear conflict as they await their inevitable demise. The novel is about a certain kind of anxious passivity in the face of incomprehensible catastrophe but it is also a narrative about work and idleness. As such, the idea of being "on the beach" invites consideration of the shore as a liminal space where often conflicting social and existential issues of meaning and purpose are played out. The waves of so-called "beach-shaming" that occurred during the early months of the global coronavirus pandemic have located, yet again, the beach as a key battleground in contemporary cultural politics

Dynamic Characteristics of Woodframe Buildings

The dynamic properties of wood shearwall buildings were evaluated, such as modal frequencies, damping and mode shapes of the structures. Through analysis of recorded earthquake response and by forced vibration testing, a database of periods and damping ratios of woodframe buildings was developed. Modal identification was performed on strong-motion records obtained from five buildings, and forced vibration tests were performed on a two-story house and a three-story apartment building, among others. A regression analysis is performed on the database to obtain a period formula specific for woodframe buildings. It should be noted that all test results, including the seismic data, are at small drift ratios (less than 0.1%), and the periods would be significantly longer for stronger shaking of these structures. Despite these low amplitudes, the equivalent viscous dampings for the fundamental modes were usually more than 10% of critical during earthquake shaking