Diffusion of Chromium in Alpha-cobalt-chromium Solid Solutions PDF Download
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Author: John W. Weeton
Publisher:
ISBN:
Category : Chromium
Languages : en
Pages : 48
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Book Description
When compared with most alloys systems for which diffusion data have been previously obtained, the diffusion rates of chromium in alpha cobalt-chromium solid solutions were found to be low.
Author: John W. Weeton
Publisher:
ISBN:
Category : Chromium
Languages : en
Pages : 48
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Book Description
When compared with most alloys systems for which diffusion data have been previously obtained, the diffusion rates of chromium in alpha cobalt-chromium solid solutions were found to be low.
Author: U. S. Department Of Transportation
Publisher: CreateSpace
ISBN: 9781508836582
Category :
Languages : en
Pages : 140
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Book Description
Bridge piers and highway embankments leading to a bridge often obstruct the flow of floodwaters, causing an increase in velocity and the development of vortices. The increased velocity and vortices often cause scour near the bridge foundations. The damage to and failure of bridges caused by scour are problems of national concern. This report describes the results of the second USGS national field-data collection and analysis study on scour at bridges, funded by FHWA. The database originally developed during the first national study has been enhanced and many scour measurements added, including measurements of abutment and contraction scour. Sufficient local pier scour data are now available to permit a detailed analysis of local pier scour. Scour depths computed from published pier scour equations are compared to the field measurements. Many commonly cited dimensionless variables believed to control the depth of scour are evaluated and compared with equations developed from laboratory data. The effect of the size and gradation of the bed material on the depth of scour is investigated, and a correction factor for the HEC-18 pier scour equation is proposed. Available data are insufficient to permit a detailed investigation of contraction and abutment scour; however, some basic comparisons and qualitative observations are presented on the basis of a review of the literature. The results of scour analyses for two contracted bridges are compared with real-time field data.
Author: Peter Frederick Lagasse
Publisher: Transportation Research Board
ISBN: 0309283566
Category : Social Science
Languages : en
Pages : 175
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Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Report 761: Reference Guide for Applying Risk and Reliability-Based Approaches for Bridge Scour Prediction presents a reference guide designed to help identify and evaluate the uncertainties associated with bridge scour prediction including hydrologic, hydraulic, and model/equation uncertainty. For complex foundation systems and channel conditions, the report includes a step-by-step procedure designed to provide scour factors for site-specific conditions."--Publisher's description.
