2,635 research outputs found
S.R. Lewis letter to Z. Eastman, March 5, 1874
No full textBrief letter from S.R. Lewis to Z. Eastman, marking the announcement of an abolitionists' reunion to be held in Chicago in June of 1875. Lewis requests that Eastman, given his close acquaintance with Benjamin Lundy, prepare a public statement of remembrance on Lundy and his contributions to the anti-slavery movement. Benjamin Lundy (1789-1839) was a prominent Quaker abolitionist best known for his development of abolitionist periodicals. His Genius of Universal Emancipation was first published in 1821 from his home in Mt. Pleasant, Ohio, and enjoyed a wide circulation across the antebellum United States. In the 1820s, the young William Lloyd Garrison came to work for The Genius. Benjamin Lundy traveled widely seeking subscriptions to The Genius, giving talks about the anti-slavery movement, and observing and documenting the conditions of enslaved people across the Americas. He was also involved in the establishment of freed slave colonies in Mexico
Modelling and optimization of a permanent-magnet machine in a flywheel
No full textThis thesis describes the derivation of an analytical model for the design and optimization of a permanent-magnet machine for use in an energy storage flywheel. A prototype of this flywheel is to be used as the peak-power unit in a hybrid electric city bus. The thesis starts by showing the feasibility of using a flywheel energy storage system for this application, as opposed to other energy storage technologies. It then continues by describing a prototype flywheel system and the required electrical machine: a radial-flux external-rotor permanent-magnet synchronous machine without slots in the stator iron and with a shielding cylinder. An analytical model for the machine is derived, based on 2D electromagnetic field calculations, including the reaction field of the eddy currents in the shielding cylinder. Torque and losses are calculated by means of the Theorem of Poynting and the Lorentz force. Such a machine was built and the analytical model has been validated by experimental measurements. Lastly, the thesis suggests and implements a machine optimization algorithm.Information Technology and System
Design metrics for evaluating the propulsive efficiency of future ships
No full textThere is an increasing need for the ship design process to take account of environmental issues such as the emission of greenhouse gases and the likely extension of a carbon dioxide charging mechanism to international shipping. These issues, together with the need for economic viability, provide further incentives to improve the efficiency of propulsion of ships. The main components of powering are firstly reviewed. Individual components and other power saving devices are identified which should contribute to improvements in the overall efficiency of propulsion. Suitable design metrics and procedures, taking into account economic and environmental factors, are recommended for the design of future ships
Description of S.R. Krom's system and machinery for dry crushing and concentrating ores.
No full textCover title.Mode of access: Internet.MAIN; TN500.K7 1876: Introduction signed by author, S.R. Krom
Experimental evaluation of Ellis scale for assessment of product's industrial design
No full textThe product development team has the task, amongst many others, to conceive the product's industrial design. Because it was proven and acknowledged that product's industrial design plays an important role in its success in the marketplace, the proposed design has to be evaluated based on an objective method. S.R. Ellis has proposed a method with seven criteria. The method was used by some researchers, but it has never been properly evaluated by an independent party. This paper presents the results of a scientific experiment aimed to test Ellis' method
A verification and validation study of the application of computational fluid dynamics to the modelling of lateral sloshing
No full textAn understanding of liquid sloshing is of primary concern to the design and operation of Liquefied Natural Gas (LNG) carriers. Safe operation of LNG carriers requires the knowledge of global and local pressures imposed by the sloshing liquid. The most general method available to quantify such sloshing loads is the solution of the Navier Stokes system of equations using Computational Fluid Dynamics (CFD). Given the wide variety of modelling options available, as yet there is no consensus on the best modelling practice for such sloshing flows.This report seeks to address this issue, examining various models and identifying the most suitable combination. The work uses the commercial CFD code ANSYS superscript TM CFX-10.0 superscript TM but most of the findings are also relevant for similar other commercial codes. The physics of the sloshing problem are considered in order to identify the key modelling aspects. The correct application of CFD and how it can be used to model sloshing is considered. A suitable experimental dataset is described for use as a validation test case. The sloshing problem simulated is in a 1.2 m long and 0.6 m high tank with a 60 % filling level; excited at 95% of the first natural frequency with a maximum displacement of 1.25 % of the tank length.A space and time discretisation independence study is carried out to ascertain the applicability of the results. Subsequently, the effect of including either a k ? ? or Reynolds stress turbulence model as opposed to forcing laminar flow is examined. The choice of fluid (water and air) compressibility is investigated to determine its effects on model accuracy as well as the associated computational cost. Results are compared to experimental data and a computational reference case.It is found that a grid of 6000-7000 elements with an initial node wall offset of 1 mm is sufficient to achieve effective grid independence for sloshing in. The necessary time discretisation scheme was determined to be second order with a dynamic timestep adaptation scheme controlled by a root mean square Courant Number of 0.2. The flow regime should be considered as turbulent and the standard k ? ? turbulence model is suitable. Finally it is observed that a compressible-incompressible model combination for air and water respectively gives a near identical result to a fully compressible model with a 20% reduction in computational time
Refinement of solutions to the linear complimentarity problem
No full textNash equilibrium;game theaory;matrices
Pleomorphic adenoma
No full textPLEOMORPHIC ADENOMA
Definition: A rare lesion morphologically similar to pleomorphic adenoma (benign mixed tumour) of salivary glands.
Epidemiology
These lesions have been reported in female patients over a wide range of age. Occasional cases affecting the male breast are on record.
Clinical features: Pleomorphic adenoma of the breast usually affects the periareolar region. On mammography it can mimic a carcinoma, as a consequence of calcifications. Malignancy can be simulated also on fine needle aspiration cytology
First human culture-proven Australian case of entomophthoromycosis caused by Basidiobolus ranarum
No full textAccepted 19 November 1993The first human case of entomophthoromycosis caused by Basidiobolus ranarum in Australia is described. Upon first presentation this rare disease was not recognized, but microscopy of biopsy sections and identification of the fungal isolate allowed this condition to be identified. Treatment with fluconazole was successful.S. R. Davis, D. H. Ellis, P. Goldwater L, S. Dimitriou and R. Byar
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