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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>EFFECT OF SEDIMENT GRADATION ON EROSION BY PLANE TURBULENT WALL JETS</title>
      <link>https://trid.trb.org/View/541154</link>
      <description><![CDATA[This paper presents the results of a laboratory study on the erosion of noncohesive sediment beds made of three different mixtures by deeply submerged plane turbulent wall jets.  The sediment mixtures had median sizes of 6.75 mm, 1.32 mm, and 1.62 mm, and geometric standard deviations of 1.32 mm, 2.02 mm, and 3.13 mm.  The main objectives were to study the effect of sediment gradation on the asymptotic scour size and determine an effective size for the sediment mixtures for predicting erosion. The experimental observations and analysis presented in this study established that the sediment nonuniformity has a significant effect on the size of the scour hole produced by the jet.  The effective size of the sediment mixture for obtaining a good correlation for the depth of scour was found to be d sub 95 rather than d sub 50 for defining the densimetric particle Froude number.  The average reduction caused by armoring in the maximum scour depth and dune height was found to be approximately 60%, and it was found to be 50% for the scour hole length and the distance of the dune.]]></description>
      <pubDate>Wed, 11 Nov 1998 00:00:00 GMT</pubDate>
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      <title>AN ELECTRICAL MEASUREMENT OF THE EFFECTIVE CROSS-SECTIONAL AREA FOR CONDUCTION OR FLOW PROCESS IN CEMENT PASTE</title>
      <link>https://trid.trb.org/View/101742</link>
      <description><![CDATA[THE EFFECTIVE CROSS-SECTIONAL AREA FOR CONDUCTION OR LIQ- UID FLOW PROCESS IN A POROUS MATERIAL IS NOT USUALLY EQUAL TO POROSITY VALUE PHI BUT TO PHI SUBSCRIPT M, WHERE M IS GREATER THAN 1. A SIMPLE WAY OF OBTAINING THIS VALUE IS DESCRIBED AND MEASUREMENTS ARE REPORTED FOR SATURATED ORDINARY AND HIGH ALUMINA CEMENT PASTE SPECIMENS WITH WATER/CEMENT RATIOS OF 0.28 AND 0.5 CURED BETWEEN 1 AND 28 DAYS, AND PARTIALLY SATURATED SPECIMENS 35 DAYS OLD. THE RESULTS ARE USED TO CALCULATE THE MEAN PORE RADIUS IN CEMENT PASTE WITH A WATER/CEMENT RATIO OF 0.5 AND TO DETERMINE THE CONTRIBUTION OF VAPOR DIFFUSION TO MOISTURE MOVEMENT IN ORDINARY PORTLAND CEMENT PASTE DRYING BETWEEN 50 AND 95 C. IT WAS FOUND THAT, EVEN AT A LOW EVAPORABLE MOISTURE CONTENT OF 10%, MECHANISMS OTHER THAN VAPOR DIFFUSION ARE CAUSING MOISTURE TRANSFER. /RRL/A/]]></description>
      <pubDate>Mon, 06 Jul 1970 00:00:00 GMT</pubDate>
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