11,795 research outputs found

    New technique for determination of cross-power spectral density with damped oscillators

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    New cross-power spectral density computation technique has been developed, as well as a technique for discrimination between periodic and random signals. This development is applicable to analysis of any stationary random process, and can be used in the aerospace and transportation fields

    Results of a UK industrial tribological survey

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    During the summer of 2012, the National Centre for Advanced Tribology at Southampton (nCATS) undertook a UK-wide industrial tribological survey in order to assess the explicit need for tribological testing within the UK. The survey was designed and implemented by a summer intern student, Mr Simon King, under the supervision of Drs John Walker and Terry Harvey and supported by the director of nCATS, Professor Robert Wood. The survey built upon on two previous tribological surveys conducted through the National Physical Laboratory (NPL) during the 1990’s. The aim was to capture a snapshot of the current use of tribological testing within UK industry and its perceived reliability in terms of the test data generated. The survey also invited participants to speculate about how UK tribology could improve its approach to testing. The survey was distributed through the nCATS industrial contact list, which comprises of over 400 contacts from a broad spectrum of commercial industries. The Institute of Physics (IOP) tribology group also assisted by distributing the survey to its membership list. A total of 60 responses were received for the survey, out of which 39 had fully completed the questionnaire. Participants came from a broad spread of industrial backgrounds, with the energy sector having the highest representation. Only 40% of respondents were dedicated tribologists/surface engineers, again reflecting the multi-disciplinary nature of the field. It was found that the companies that had the highest annual turnover also appeared to expend the most on tribology. The majority of respondents indicated that as a percentage of turnover tribology accounted for less than 1%, however the lack of hard figures only for tribology make this a conservative estimate. The greatest concern in relation to tribology of those who responded was the cost; however the influence of legislation and product reliability were also driving factors. Abrasive wear was still considered the number one tribological wear mechanism, with sliding contacts ranking as the most common type of wear interface. Metallic and hard coated surfaces were the most commonly encountered type of material suffering from tribological wear phenomena. Laboratory scale testing was a significant part of introducing a new tribological component, however component specific testing was considered the most reliable form of testing a new component over standardised test geometries. Overall there appeared to be much potential for improving the reliability of tribological test data, with most respondents indicating that simply more testing was not the best perceived approach to improving tribological data but rather more reliable, representative tests with improved knowledge capture. Most companies possessed an internal database to assist them with tribological information; however, many also expressed a strong desire for the use of a commercial or national database, although the format this might take was less clear. Opinions appeared split as to whether there would be a collective willingness to contribute to a centralised database, presumably on the grounds on the sensitivity of data

    Brexit: prioritise getting a good deal from the EU over getting a speedy one

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    Now it's more important than ever to embrace free trade and open our economy to the world, writes Simon Walke

    Appropriate Perspectives for Health Care Decisions

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    NICE uses cost-effectiveness analysis to compare the health benefits expected to be gained by using a technology with the health that is likely to be forgone due to additional costs falling on the health care budget and displacing other activities that improve health. This approach to informing decisions will be appropriate if the social objective is to improve health, the measure of health is adequate and the budget for health care can reasonably be regarded as fixed. If NICE were to recommend a broader =societal perspective‘, wider effects impacting on other areas of the public sector and the wider economy would be formally incorporated into analyses and decisions. The problem for policy is that, in the face of budgets legitimately set by government, it is not clear how or whether a societal perspective can be implemented, particularly if transfers between sectors are not possible. It poses the question of how the trade-offs between health, consumption and other social arguments, as well as the valuation of market and non market activities, ought to be undertaken.Perspective. Cost-effectiveness analysis. Economic evaluation.
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