2,772 research outputs found
Culinary arts competencies in hospitality curriculum
A modified two-round Delphi study of fifteen hospitality educators and fifteen industry managers was used to identify instructional objectives for culinary arts education and to establish the positions of educator and industry relative to these objectives. These professionals confirmed that there does exist a divergent opinion on competencies, while affirming the value of continued dialogue to apprise each other of their needs. Working with culinary arts faculty, the voice of industry speaks to great and immediate challenges, which require an evolving curriculum to prepare future culinarians
A review of the emergency electric power supply systems at PWR nuclear power plants
Bibliography: pages 168-174.The Emergency Electric Power Supply Systems at Pressurized Water Reactor Nuclear Power Plants are reviewed, problem areas are identified, and recommendations are made for existing and future Nuclear Power Plants. A simplified introduction to a typical Pressurized Water Nuclear Reactor is given and the problems associated with the commercial use of nuclear power are discussed. An overview of the Nuclear industry's solutions is presented and covers the Reliability of equipment and the American Regulatory requirements. The alternating and direct current power supply systems are examined in terms of plant operational state and equipment type (Diesel generators, Grid network, Lead-acid batteries, Battery chargers, Inverters, and Power Distribution networks). The trends in the design of Emergency Electric Power supply systems at Nuclear Power Plants are presented. The loss of all alternating current power, known as Station Blackout, is discussed and the American and European response to this. problem is presented. Problems experienced in the direct current systems are discussed and solutions are presented. The experience at Koeberg Nuclear Power station with Lead-acid batteries is included in the discussion. The thesis concludes with recommendations for designers and operators of the Electric Power Supply Systems at Nuclear Power Stations
Human computer interaction for international development: past present and future
Recent years have seen a burgeoning interest in research into the use of information and communication technologies (ICTs) in the context of developing regions, particularly into how such ICTs might be appropriately designed to meet the unique user and infrastructural requirements that we encounter in these cross-cultural environments. This emerging field, known to some as HCI4D, is the product of a diverse set of origins. As such, it can often be difficult to navigate prior work, and/or to piece together a broad picture of what the field looks like as a whole. In this paper, we aim to contextualize HCI4Dâto give it some historical background, to review its existing literature spanning a number of research traditions, to discuss some of its key issues arising from the work done so far, and to suggest some major research objectives for the future
The crystal structure of calcite III
The crystal structure of calcite III has been deduced from existing high pressure powder X-ray diffraction patterns, based on the assumption that it is a displacive modification of the calcite I structure. The structure is monoclinic with space group C2 and a Z of 6. There are two Ca and two C positions, and five O positions, and atom coordinates have been refined by distance-least-squares methods to give reasonable octahedral coordination for Ca and parallel, planar CO_3 groups. Unit cell parameters refined from a published powder diffraction pattern at 4.1 GPa are: a = 8.746(8)Ă
; b = 4.685(5)Ă
; c = 8.275(8)Ă
; and ÎČ= 94.4°. The structure has a calculated density of 2.949 Mg/mÂł at 4.1 GPa which is less than that of aragonite at this pressure and consistent with early piston cylinder studies. This implies that calcite III is indeed a metastable intermediary between calcite I and aragonite
An Analysis of the Association between Changes in Ambient Temperature, Fuel Economy, and Vehicle Range for Battery Electric and Fuel Cell Electric Buses
This report evaluates the effects of changes in ambient temperature on the fuel efficiency and range of zero emission buses. The report relies on data that was made available from transit agencies that have deployed hydrogen fuel cell and battery electric zero-emission buses. This analysis shows that the fuel economy and range of electric drive buses may vary significantly with changes in outdoor temperature. In planning zero emission fleet development strategy, it is important for transit agencies to understand how their zero-emission busâs performance may change with temperature. The effects of temperature change on range may be particularly important in planning fleet development, especially for transit agencies located in climates with extreme heat or cold
An Analysis of the Association between Changes in Ambient Temperature, Fuel Economy, and Vehicle Range for Battery Electric and Fuel Cell Electric Buses
This report evaluates the effects of changes in ambient temperature on the fuel efficiency and range of zero emission buses. The report relies on data that was made available from transit agencies that have deployed hydrogen fuel cell and battery electric zero-emission buses. This analysis shows that the fuel economy and range of electric drive buses may vary significantly with changes in outdoor temperature. In planning zero emission fleet development strategy, it is important for transit agencies to understand how their zero-emission busâs performance may change with temperature. The effects of temperature change on range may be particularly important in planning fleet development, especially for transit agencies located in climates with extreme heat or cold
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Sensitivityâbased singular value decomposition parametrization and optimal regularization in finite element model updating
Model updating is used to reduce error between measured structural responses and corresponding finite element (FE) model outputs, which allows accurate prediction of structural behavior in future analyses. In this work, reducedâorder parametrizations of an underlying FE model are developed from singular value decomposition (SVD) of the sensitivity matrix, thereby improving efficiency and posedness in model updating. A deterministic error minimization scheme is combined with asymptotic Bayesian inference to provide optimal regularization with estimates for model evidence and parameter efficiency. Natural frequencies and mode shapes are targeted for updating in a smallâscale example with simulated data and a fullâscale example with real data. In both cases, SVDâbased parametrization is shown to have good or better results than subset selection with very strong results on the fullâscale model, as assessed by Bayes factor
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