منابع مشابه
An Ultrasonic technology Study for the Subsurface Defect in Railway Wheel Tread
The subsurface defect in the wheel tread caused from Rolling Stock Fatigue (RCF) has become more danger in high speed railway. The conventional UT and phased array UT have deficiency to find the subsurface defect from the tread surface because of limitation of ultrasonic near field. In this paper, the subsurface defect is studied by simulation and experimental results with ultrasonic technique....
متن کاملThe Influence of Route Characteristics, Train Design and Maintenance Policy on Wheel Tread Damage, Wheel Life and Costs for Multiple-unit Trains
In the UK, the use of similar vehicle types by a range of privatised operators gives the opportunity to assess the influence of different route conditions and maintenance practices on wheel tread damage, wheelset life and costs. This paper investigates these influences, using data obtained directly from the train operators and maintainers. By disseminating best practice it is expected that whee...
متن کاملAn Ultrasonic technology Study for Subsurface Defect in Railway Wheel Tread
The subsurface defect in the wheel tread caused from Rolling Stock Fatigue (RCF) has become more danger in high speed railway. The conventional UT and phased array UT have deficiency to find the subsurface defect from the tread surface because of limitation of ultrasonic near field. In this paper, the subsurface defect is studied by simulation and experimental results with ultrasonic technique....
متن کاملLiberty or death; don't tread on me.
Many jurisdictions require cyclists to wear bicycle helmets. The UK is currently not one of these. However, an increasing number of interest groups, including the British Medical Association, want to change the status quo. They argue that mandatory cycle helmet laws will reduce the incidence of head injuries and that this will be both good for cyclists (because they will suffer fewer head injur...
متن کاملCell migration: Don’t tread on me
During directed cell migration, telling cells to avoid certain areas may be as important as attracting them to others. The recently identified wunen gene is involved in the repulsive guidance of migrating primordial germ cells in Drosophila.
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ژورنال
عنوان ژورنال: The New England Journal of Medicine, Surgery and Collateral Branches of Science
سال: 1824
ISSN: 2163-3061,1533-4406
DOI: 10.1056/nejm182401010130115