3.1 Definitions in this standard are to be regarded as the correct ones for terms found in other ASTM standards of Committee D18. Certain terms may be found in more than one standard issued under the jurisdiction of this committee and many of these terms have been placed in this standard.
3.2 Terms that are defined in some textbooks may differ slightly from those in this terminology standard. Definitions in this terminology standard are to be regarded as correct for ASTM usage.
3.3 See Appendix X1 for References.
3.4 Definitions marked with (ISRM) are included for the convenience of the user and were taken directly from the International Society for Rock Mechanics (see X1.3).
3.5 A number of the definitions include symbols. The symbols appear in italics immediately after the name of the term.
3.5.1 No significance should be placed on the order in which the symbols are presented where two or more are given for an individual term.
3.5.2 The symbols presented are examples; therefore, other symbols are acceptable.
3.5.3 See Appendix X2 for ISRM Symbols.
3.6 A number of definitions indicate the units of measurements in brackets and which follow the symbol(s) if given. The applicable units are indicated by italic capital letters, as follows:
8199;D—Dimensionless
8199;F—Force, such as pound-force, ton-force, newton
8199;L—Length, such as inch, foot, millimeter, and meter4
8199;M—Mass, such as kilogram, gram
8199;T—Time, such as second, minute
3.6.1 Positive exponents designate multiples in the numerator. Negative exponents designate multiples in the denominator. Degrees of angle are indicated as “degrees.”
3.6.2 Expressing the units either in SI or the inch-pound system has been purposely omitted in order to leave the choice of the system and specific unit to the engineer and the particular application, for example:
8199;FL−2—may be expressed in pounds-force per square inch, kilopascals, tons per square foot, etc.
8199;LT−1—may be expressed in feet per minute, meters per second, etc.
水體反射光譜與水的狀態、所含能量、水中有機質、水藻、泥沙等有關。4植被的反射光譜特征地面植物具有明顯的光譜反射特征,不同于土壤、水體和其他的典型地物,植被對電磁波的響應是由其化學特征和形態學特征決定的,這種特征與植被的發育、健康狀況以及生長條件密切相關。??... 當孔隙內的液體為水且磁場梯度近似為零的條件下,多孔介質體系的橫向弛豫時間和縱向弛豫時間只與多孔介質的孔隙結構有關系,主要受體系的表面弛豫機制影響,而近似與其他兩類弛豫機制無關核磁共振在石油巖心領域的功能 :1)孔隙度、含水率、含水飽和度的測定2)凍融溫度-滲流-應力損傷本構模型3)凍融機理研究4)凍土未動水含量測定5)天然氣水合物的形成與過程分解6)毛細水與吸附水含量測定應用舉例一:土壤孔徑分布土壤... 當孔隙內的液體為水且磁場梯度近似為零的條件下,多孔介質體系的橫向弛豫時間和縱向弛豫時間只與多孔介質的孔隙結構有關系,主要受體系的表面弛豫機制影響,而近似與其他兩類弛豫機制無關核磁共振在石油巖心領域的功能 :1)孔隙度、含水率、含水飽和度的測定2)凍融溫度-滲流-應力損傷本構模型3)凍融機理研究4)凍土未動水含量測定5)天然氣水合物的形成與過程分解6)毛細水與吸附水含量測定應用舉例一:土壤孔徑分布土壤... 21表面張力和表面能(Surface tension and surface energy)液體內部分子的吸引力使表面上的分子處于向內一種力作用下,這種力使液體盡量縮小其表面積而形成平行于表面的力,稱為表面張力。或者說是液體表面相鄰兩部分間單位長度內的相互牽引力,它是分子力的一種表現。表面張力的單位是N/m。表面張力的大小與液體的性質、純度和溫度有關。表面張力乘表面的面積即為表面能。...核磁共振應用巖土孔隙結構分析和孔隙度測量
核磁共振應用于巖土孔隙結構分析和孔隙度測量
非金屬材料的性能指標術語,值得收藏!
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