Letteratura scientifica selezionata sul tema "Caversham Press"

One of the great business institutions of the modern era is the BBC which is now 100 years old. The authors explored letters and memoranda in the BBC’s Written Archives at Caversham, which revealed much about the business tactics of those in charge of the BBC during the pre-Second World War era, and how they used the power of their monopoly to their own ends. A new market of broadcasting magazines sprang up around the radio broadcasts, creating an inter-dependency between the two media. The BBC soon launched its own magazines, and from then on, the BBC’s interactions with the press media were complex, reflecting an uncomfortable blend of symbiosis and threat. Episodes between the press owners and the BBC have been uncovered, about which there has been little previous investigation, and unexpected patterns of behaviour have emerged. This archival research, using narrative history, is based upon original letters, memoranda and handwritten messages that were archived for posterity, and which report upon the actual thoughts and views of those involved at the time, revealing unexpected intrigue and machinations.

Abstract Near-wall modeling is one of the most challenging aspects of computational fluid dynamic computations. In fact, integration-to-the-wall with low-Reynolds approach strongly affects accuracy of results, but strongly increases the computational resources required by the simulation. A compromise between accuracy and speed to solution is usually obtained through the use of wall functions (WFs), especially in Reynolds averaged Navier–Stokes computations, which normally require that the first cell of the grid to fall inside the log-layer (50 < y+ < 200) (Wilcox, D. C., 1998, Turbulence Modeling for CFD, Vol. 2, DCW Industries, La Cañada, CA). This approach can be generally considered as robust, however the derivation of wall functions from attached flow boundary layers can mislead to nonphysical results in presence of specific flow topologies, e.g., recirculation, or whenever a detailed boundary layer representation is required (e.g., aeroacoustics studies) (Craft, T., Gant, S., Gerasimov, A., Lacovides, H., and Launder, B., 2002, “Wall – Function Strategies for Use in Turbulent Flow CFD,” Proceedings to 12th International Heat Transfer Conference, Grenoble, France, Aug. 18–23). In this work, a preliminary attempt to create an alternative data-driven wall function is performed, exploiting artificial neural networks (ANNs). Whenever enough training examples are provided, ANNs have proven to be extremely powerful in solving complex nonlinear problems (Goodfellow, I., Bengio, Y., Courville, A., and Bengio, Y., 2016, Deep Learning, Vol. 1, MIT Press, Cambridge, MA). The learner that is derived from the multilayer perceptron ANN, is here used to obtain two-dimensional, turbulent production and dissipation values near the walls. Training examples of the dataset have been initially collected either from large eddy simulation (LES) simulations of significant 2D test cases or have been found in open databases. Assessments on the morphology and the ANN training can be found in the paper. The ANN has been implemented in a Python environment, using scikit-learn and tensorflow libraries (Scikit-Learn Developers, 2019, “Scikit-learn v0.20.0 User Guide,” Software, Scikit-Learn Developers; Abadi, M., Barham, P., Chen, J., Chen, Z., Davis, A., Dean, J., Devin, M., Ghemawat, S., Irving, G., Isard, M., Kudlur, M., Levenberg, J., Monga, R., Moore, S., Murray, D. G., Steiner, B., Tucker, P., Vasudevan, V., Warden, P., Wicke, M., Yu, Y., and Zheng, X., 2016, “TensorFlow: A System for Large-Scale Machine Learning,” 12th Symposium on Operating Systems Design and Implementation, Savannah, GA, Nov. 2–4, pp. 265–283). The derived wall function is implemented in openfoam v-17.12 (CFD Direct, 2020, “OpenFoam User Guide v5,” CFD Direct, Caversham, UK), embedding the forwarding algorithm in run-time computations exploiting Python3.6m C_Api library. The data-driven wall function is here applied to k-epsilon simulations of a 2D periodic hill with different computational grids and to a modified compressor cascade NACA aerofoil with sinusoidal leading edge. A comparison between ANN enhanced simulations, available data and standard modelization is here performed and reported.

Date in university's graduation list: April 2003.
Thesis (MA (VA))--Stellenbosch University, 2002.
ENGLISH ABSTRACT: The body of the thesis explores contemporary South African printmaking by focusing on The Caversham Press, established in 1985. Caversham's success encouraged the opening of four other studios, which formed the core of professional printmaking in South Africa up to 2000. Positioning Caversham in a broader arena, the politicised nature of printmaking in South Africa prior to 1985 is discussed and six projects produced at the Press between 1985 and 2000 are examined to situate the Press within the South African socio-economic and cultural context. Finally, the interaction between prints from Caversham Press projects and the art market in Johannesburg is described and analysed to ascertain the extent to which these six projects were products of their time and place in South African art history. In Appendices IV and V, the candidate's own printmaking work, which examines male midlife depression and its impact on the marital relationship, is discussed.
AFRIKAANSE OPSOMMING: Die hoofdeel van die tesis ondersoek die hedendaagse Suid-Afrikaanse drukkuns op die werk van The Caversham Press wat in 1985 gestig is, te fokus. Caversham se sukses het aanleiding gegee tot die ontstaan van vier ander drukkunsateljees wat die kern van professionele drukkuns gevorm het tot in die jaar 2000. Deur Caversham in 'n breër konteks te plaas, word die gepolitiseerde aard van drukkuns in Suid-Afrika voor 1985 bespreek. Verder word die ses ondernemings wat deur Caversham tussen 1985 en 2000 opgelewer is in die konteks van sosio-ekonomiese en kulturele omstandighede ondersoek. Ten slotte word die interaksie tussen Caversham Press projekte en die kunsmark van Johannesburg ontleed en bespreek met die doelom vas te stel tot hoe 'n mate hierdie ses projekte die tyd en plek van die Suid- Afrikaanse kunsgeskiedenis reflekteer. In Bylae IV en V, word die kandidaat se eie drukkunswerke, wat depressie in mideljarige mans ondersoek en die gevolg daarvan op die huweliksverhouding uitbeeld, bespreek.