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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>
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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>Transport Research International Documentation (TRID)</title>
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      <title>ENTROPY AS CRITERION OF HETEROGENEITY OF ROCKS</title>
      <link>https://trid.trb.org/View/121323</link>
      <description><![CDATA[ENTROPY OF A MATERIAL SYSTEM MAY SERVE AS A CRITERION OF ITS HETEROGENEITY. THIS MAKES IT POSSIBLE, IN GEOLOGY, TO USE ENTROPY IN STUDIES AND QUANTITATIVE RATINGS OF HETEROGENEITY OF GEOLOGICAL BODIES. RELATIVE ENTROPY IS A MOST CONVENIENT CRITERION OF HETEROGENEITY, HOWEVER IT IS CALCULABLE WITH THE AID OF NATURAL LOGARITHMIC TABLES. HETEROGENEITY OF DISCRETE TYPES OF ROCKS, IN RELATION TO THEIR FRACTIONAL (PARTICLE SIZE) COMPOSITION, AND HETEROGENEITY OF LITHOLOGICAL COMPLEXES (BODIES OF ROCK), IN RELATION TO PROPORTIONS OF DIFFERENT ROCK TYPES IN THE SECTION, MAY BE STUDIED (EXPRESSED AS ENTROPIES). THE CONCEPT OF ENTROPY, PERTAINING TO THE DEGREES OF HETEROGENEITY, MAY PROVE USEFUL NOT ONLY IN LITHOLOGY AND PETROGRAPHY, BUT ALSO IN SCIENCES SUCH AS GEOCHEMISTRY AND HYDROCHEMISTRY. /AUTHOR/]]></description>
      <pubDate>Sun, 15 Aug 2004 02:38:55 GMT</pubDate>
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      <title>REFLECTION OF SEISMIC WAVES FROM NON-MIRROR-LIKE REFLECTING BOUNDARIES</title>
      <link>https://trid.trb.org/View/121090</link>
      <description><![CDATA[DESPITE AN ABUNDANCE OF RUSSIAN PAPERS DEALING WITH 'CONTROLLABLE DIRECTIONAL RECEPTION' (CDR), NO CLEAR-CUT DESCRIPTION OF CDR HAS BEEN FOUND. THE TRANSLATIONS COMMITTEE OF THE SOCIETY OF EXPLORATION GEOPHYSICISTS IS CONTINUING ITS SEARCH FOR AN APPROPRIATE PRESENTATION. MEANWHILE, IT IS APPARENT THAT THIS METHOD IS CONSIDERED TO BE THE MOST SUCCESSFUL SEISMIC EXPLORATION TOOL IN THE USSR. THIS PAPER EXPLAINS THE WORKINGS OF CDR AND SERVES AS AN INTRODUCTION TO THE METHOD, USING ONLY CONVENTIONAL MATHEMATICS. THE DESCRIPTION IS AS INFORMATIVE AS CAN BE FOUND UP TO NOW. /IGR/]]></description>
      <pubDate>Sun, 15 Aug 2004 02:38:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/121090</guid>
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      <title>A GRAVITATIONAL REVOLVING DISC MINERAL SEPARATOR</title>
      <link>https://trid.trb.org/View/118246</link>
      <description><![CDATA[THE SEPARATOR WAS DESIGNED TO SEPARATE THOSE MINERALS NOT POSSESSING MAGNETIC AND ELECTRIC PROPERTIES, HAVING A SPECIFIC GRAVITY GREATER THAN 4 AND NOT EASILY SEPARATED WITH CONVENTIONAL MINERAL SEPARATORS. /AUTHOR/]]></description>
      <pubDate>Sun, 15 Aug 2004 01:50:43 GMT</pubDate>
      <guid>https://trid.trb.org/View/118246</guid>
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    <item>
      <title>STRUCTURAL STRENGTH OF ALLUVIAL-DELUVIAL SANDY LOAMS, LOAMS AND CLAYS, IN SHRINKING</title>
      <link>https://trid.trb.org/View/123714</link>
      <description><![CDATA[A DIRECT POSITIVE CORRELATION BETWEEN SHRINKAGE COEFFICIENT AND BEARING STRENGTH OF THE GROUND IS DEMONSTRATED IN MONOLITH AS WELL AS IN HOMOGENIZED SAMPLES, UNDER LABORATORY CONDITIONS, AND ALSO THE EFFECT OF ELECTROLYTES UPON THE SHRINKAGE COEFFICIENT. ALL OTHER THINGS BEING THE SAME, THE EFFECTIVENESS OF THE ELECTROLYTES DECREASES IN THE FOLLOWING ORDER: MAGNESIUM SULFATE, SODIUM SULFATE, MAGNESIUM CHLORIDE, SODIUM CHLORIDE, CALCIUM CHLORIDE, POTASSIUM SULFATE, POTASSIUM CARBONATE, POTASSIUM CHLORIDE. /IGR/]]></description>
      <pubDate>Sun, 16 Jan 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/123714</guid>
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      <title>PRINCIPLES OF MAJOR CLASSIFICATION OF NATURAL WATERS</title>
      <link>https://trid.trb.org/View/140081</link>
      <description><![CDATA[The article presents some interesting, highly controversial, but well documented, ideas on the genesis of natural waters and their subsequent evolution.  "Endothegenic" is embraced as a better name for what has long been called "juvenile" water.  "Biogenic" waters include all other waters of various origins, except "cosmic" waters which are extra-global.  Subclasses of water should be defined on basis of principal anion(s) and on physical criteria such as temperature or isotopic composition.]]></description>
      <pubDate>Wed, 29 Jan 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/140081</guid>
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    <item>
      <title>AN APPROXIMATE METHOD OF COMPUTING SEDIMENTATION RATES IN A SEAWAY</title>
      <link>https://trid.trb.org/View/140098</link>
      <description><![CDATA[The authors endeavor to show that the sedimentation in a seaway can be computed mathematically from an equation for suspended load distribution along a reach of current, by applying some of the same equations used for stream bead sedimentation.]]></description>
      <pubDate>Thu, 16 Jan 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/140098</guid>
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      <title>PHASE TRANSFORMATIONS IN DEPTHS OF THE EARTH: A HYPOTHESIS</title>
      <link>https://trid.trb.org/View/140102</link>
      <description><![CDATA[A new modification of silicon dioxide with a density of 4.35, and a hexagonal coordination of Si, was produced in the laboratory at 115 to 145 kilobars pressure and about 1500 degrees C, i.e., under conditions resembling the environment of the "C" zone of the Earth's mantle.  This previously unknown SiO2 mineral resembles the rutile-structured variety of SiO2 discovered by Americans in the crater of the Arizona meteorite.  These discoveries are in harmony with the modern tentative view of geophysicists who regard the "C" zone as the zone of transitions or conversions of silicon oxide structures, from the still higher coordination of Si in the "D" zone to the tetrahedral one in "B" and "A".]]></description>
      <pubDate>Thu, 16 Jan 1975 00:00:00 GMT</pubDate>
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      <title>DEFINITION OF THE CONCEPT "CLAY MINERAL"</title>
      <link>https://trid.trb.org/View/124307</link>
      <description><![CDATA[A BRIEF HISTORY IS PRESENTED OF STUDIES OF THE PROPERTIES OF CLAY MINERALS. PRINCIPLE SPECIFIC FEATURES OF THE CRYSTAL CHEMISTRY OF SURFACES OF CLAY MENERALS ARE POINTED OUT BY COMPARISON WITH THOSE OF NONARGILLACEOUS MINERALS OF SIMIALR STRUCTURE. BASIC CRITERIA ARE POSTULATED FOR INCLUDING MINERALS GROUP, AND THE ESSENCES PRESENTED OF CLAY PROPERTIES OF ROCK. THE UNEQUAL ENERGY OF ADSORPTION SITES (WITH RESPECT TO CATIONS AND MOLECULES OF WATER) ON MINERAL SURFACES IS RESPONSIBLE FOR THE NATURE OF THE PROCESSES TAKING PLACE AT THE INTERFACE IN A GIVEN SYSTEM. MOST CLAY MINERALS EXHIBIT A LAMINAR CRYSTAL STRUCTURE AND A CHARACTERISTIC FEATURE IS THE ACTIVITY OF THE SURFACES OF THE CRYSTAL BASES IN ADSORPTION OF CATIONS AND WATER MOLECULES. THE ADSORPTION SITES OF THE CRYSTAL BASES OF CLAY MINERALS ARE USUALLY RELATED TO CATIONS OF ALKALI AND ALKALINE-EARTH METALS. THESE ARE THE EXCHANGE CATIONS WHICH FORM AN INTEGRAL HOLD WITH THE CRYSTAL LATTICE OF THESE MINERALS AND THEY ARE LINKED TO THE SURFACE BY BONDS OF WEAKER ENERGY, THEN THE SMALLER NUMBER OF CATIONS ABSORBED FROM THE SURROUNDING MEDIUM BY THE ADSORPTION SITES ON SURFACES OF THE CORNERS, EDGES, AND CLEAVAGE PLANES OF THE CRYSTALS, WHICH ARE BROKEN VALENCE BONDS. FOR NONARGILLACEOUS MINERALS,THE NATURAL STATE IS MACROCRYSTALLINE. IT IS PROPOSED THAT THE TERM CLAY MINERAL BE APPLIED TO CRYSTALLINE HYDROUS SILICATES, CHARACTERIZED BY THE FOLLOWING CRITERION: (1) A LAMINAR OR CHAIN-LAMINAR TYPE OF STRUCTURE, (2) A HIGH DEGREE OF DISPERSITY, (3) PREDOMINANCE OF ADSORPTION SITES FOR CATIONS AND WATER MOLECULES ON THE BASAL FACES OF THE CRYSTALS OVER SIMILAR SITES ON THE CORNERS, EDGES, AND CLEAVAGE FACES, (4) ADSORPTION SITES OF THE FIRST CATEGORY EXHIBIT LOWER ENERGY THAN THOSE OF THE SECOND, (5) SURFACE DISSOCIATION IN AN AQUEOUS MEDIUM AND THE RESULTANT FORMATION OF A LAYER OF OSMOTIC WATER AT THE MINERAL SURFACES, (6) THE PRESENCE OF A SPECIAL TYPE OF OSMOTIC WATER ON THE OUTER BASAL SURFACES OF THE CRYSTALS AND THEIR MICROAGGREGATES IN AN AQUEOUS MEDIUM, AND (7) THE MANIFESTATION OF "CLAY" PROPERTIES IN THE SYSTEM MINERALS-WATER-IONS WHEN IT CONTAINS OSMOTIC WATER OF MINERALS. THE DEGREE OF SURFACE DISSOCIATION OF CLAY MINERALS INCREASES WITH THEIR DEGREE OF HYDRATION UP TO A MOISTURE CONTENT CORRESPONDING TO MAXIMUM SWELLING OF THE CLAY, AND THEN REMAINS CONSTANT.]]></description>
      <pubDate>Tue, 21 Jul 1970 00:00:00 GMT</pubDate>
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