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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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      <title>PROPERTIES OF THERMISTORS</title>
      <link>https://trid.trb.org/View/106587</link>
      <description><![CDATA[THE CHARACTERISTICS OF THERMISTORS, SEMI-CONDUCTORS WITH LARGE NEGATIVE TEMPERATURE COEFFICIENTS OF ELECTRICAL RESISTANCE, ARE REVIEWED AND COMPARED WITH STANDARD RESISTANCE THERMOMETERS. DESCRIPTIONS ARE GIVEN OF THE VARIOUS SIZES AND SHAPES COMMERCIALLY AVAILABLE, THERMAL LIMITATIONS IN THEIR USE, AND THE VARIOUS MATERIALS USED IN MANUFACTURE. OTHER USES FOR THERMISTORS, SUCH AS TEMPERATURE CONTROL, ELECTRICAL REGULATION, AND MEASUREMENT OF OTHER VARIABLES ARE CONSIDERED. CLASSIFICATION OF SEMI-CONDUCTORS AND THE THEORY OF OPERATION IS DISCUSSED AND AN EXPRESSION FOR ELECTRONIC CONDUCTIVITY IS DEVELOPED FROM WHICH A METHOD IS PROPOSED FOR THE COMPARISON OF VARIOUS THERMISTORS. STEADY STATE AND TRANSIENT THERMAL ERRORS ARE EVALUATED, AND FACTORS AFFECTING CALIBRATION STABILITY ARE DESCRIBED. RECOMMENDATIONS FOR SELECTION OF THERMISTORS AND PROPER CIRCUITRY ARE GIVEN. A SELECTED BIBLIOGRAPHY ON THERMISTORS IS GIVEN. /AUTHOR/]]></description>
      <pubDate>Tue, 04 Oct 1994 00:00:00 GMT</pubDate>
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      <title>PROTECTION OF CONCRETE REINFORCEMENT IN CRACKS BY MEANS OF CORROSION INHIBITORS</title>
      <link>https://trid.trb.org/View/67400</link>
      <description><![CDATA[A study was carried out of the rate of corrosion of reinforcement in fissured concrete and of the effect of adding nitrate-calcium nitrite (nnk). The addition of nnk decreases the depth and surface area of corrosion.  An investigation was also conducted into the rate of carbonation of concrete containing nnk.  It was shown that this additive decreases the rate and depth of carbonation thus increasing the protection of the reinforcement.  The process is explained in detail. /TRRL/]]></description>
      <pubDate>Wed, 22 Jun 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/67400</guid>
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    <item>
      <title>TEMPERATURE MEASUREMENT UTILIZING PLATINUM RESISTANCE SENSORS</title>
      <link>https://trid.trb.org/View/32337</link>
      <description><![CDATA[Platinum resistance sensors are currently used for continuous service from -260 degrees C to 800 degrees C and 1200 degrees C for short term use. The historical development of resistance sensors is discussed and the advantages of using platinum resistance sensors over thermocouples is described. Parameters used in the evaluation of platinum sensors and signal conditioners are enumerated. Errors encountered in temperature measuring schemes and methods to reduce these errors are summarized. /GMRL/]]></description>
      <pubDate>Wed, 02 Jul 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/32337</guid>
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    <item>
      <title>THE THERMAL CONDUCTIVITY PROBE</title>
      <link>https://trid.trb.org/View/128199</link>
      <description><![CDATA[THE PORTABLE THERMAL CONDUCTIVITY PROBE WAS DEVELOPED IN TORONTO BY UTILIZING A TRANSIENT HEAT-FLOW PRINCIPLE. THE TESTS ARE ACCOMPLISHED IN A FEW MINUTES, BEFORE THE MOISTURE MIGRATION CAN SIGNIFICANTLY DISTURB THE ORIGINAL DISTRIBUTION, WHILE AT THE SAME TIME THIS MECHANISM IS INCLUDED AS A CONTRIBUTING FACTOR IN THE MEASURED PROPERTIES. THE PROBE IS DESCRIBED AND CONSISTS OF AN ALUMINUM TUBE APPROXIMATELY 18 IN. IN LENGTH. INSIDE OF THE TUBE IS STRETCHED AN AXIAL CONSTANTAN RESISTANCE WIRE WHICH SERVES AS A CONSTANT STRENGTH HEAT SOURCE. NEAR THE CENTER OF THE TUBE LENGTH IN CONTACT WITH THE INNER WALL ARE THE HOT JUNCTIONS OF SEVERAL THERMOCOUPLES ARRANGED IN SERIES WITH EXTERNAL COLD JUNCTIONS. THE TUBE IS CLOSED BY A STEEL TIP AT THE LOWER END AND THE WIRING CARRIED OUT THROUGH A SEAL AT THE UPPER END. THE NECESSARY POTENTIOMETER, BATTERY AND CONTROLS ARE CONVENIENTLY MOUNTED IN A SUITCASE TO MAKE THE EQUIPMENT PORTABLE. TO MAKE A DETERMINATION, THE PROBE IS THRUST INTO THE SOIL FOR ITS FULL LENGTH. EQUATIONS ARE PRESENTED WHICH ARE USED TO DETERMINE THE THERMAL CONDUCTIVITY DIRECTLY FROM THE OBSERVATIONS OBTAINED. THE PROBE IS NOT YET COMMERCIALLY AVAILABLE.]]></description>
      <pubDate>Mon, 14 Sep 1970 00:00:00 GMT</pubDate>
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