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題名 | 臺灣主要經濟樹種材質之基礎研究(13):臺灣赤楊、錐果櫟及烏心石之誘電率、誘電體力率及電阻係數之變異性 |
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作者姓名(中文) | 王松永; | 書刊名 | 林產工業 |
卷期 | 10:1 1991.03[民80.03] |
頁次 | 頁1-24 |
分類號 | 436.18 |
關鍵詞 | 材質; 烏心石; 經濟; 電阻係數; 臺灣; 臺灣赤楊; 誘電率; 誘電體力率; 樹種; 錐果櫟; |
語文 | 中文(Chinese) |
中文摘要 | 本研究係探討台灣赤楊,錐果櫟及烏心石等潤葉樹材在單株內之誘電特性的變異性,得到次述結果:(1)誘電率(ε')在橫向變異性可歸納為四個獨型,而軸向變異性則為三個類型。(2)誘電力學(tan δ)與電阻係數(ρ)在橫向變異性可歸納為五個類型,但軸向變異性則為三個類型。(3)誘電率(ε')值及誘電體力率(tan δ)均以橫切面較徑切面及弦切面為大,又徑切面較弦切面為小,但電阻係數(ρ)則相反。(4)誘電率(ε')會隨氣乾比重(r_u)增加而呈直線狀增大,其關係可以迴歸直線式(10)~(12)表示。但誘電體力率及電阻係數則與氣乾比重之間無一定趨勢。(5)誘電率(ε')及誘電體力率(tan δ)會隨木材含水率(u)增加而增加,而電阻係數(ρ)則相反,各可以迴歸式仰(13)~(15)表示。(6)誘電率心(ε')、誘電體力率(tan δ)與電阻係數(ρ)均會隨頻率(f)增加而呈單對數或變對數式減低,各可以迴歸式(16)~(18)表示。 |
英文摘要 | The variation in the transversal and axial direction of dielectric Properties of Taiwan alder, Narrow leaved oak and Formosan michelia in a single trunk were investigated. The experimental results are summarized as follows: (1) The variation in dielectric constants along the transversal direction can be classified into four types. However, there are three types of variation in the axial direction. (2) The variation in dielectrical power factor and resistivity along the transversal direction can be classified into five types. However, there are three types of variation in the axial direction. (3) The values of dielectric power factor of cross sectional specimens were greater than those in the radial and tangential sectional specimens. However, the resistivity showed the contrary trend. (4) The values of dielectric constants increased linearly with increasing specific gravity. Their relationships can be represented by the regression equations (10) ~ (12). However, there are no significant correlation among dielectrical power factor and resistivity with specific gravity. (5) The values of dielectric constants and dielectrical power factor increased with increasing moisture content. However, the resistivity showed the contrary trend. Their relationships can be represented by the regression equations (13) ~ (15). (6) The values of dielectric constants, dielectrical power factor and resistivity decreased with increasing frequency as the relations by semi-logarithmic and logarithmic formulas. Their relationships could be described by regression equations (16) ~ (18). |
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