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growth ring boundary
相关语句
  相似匹配句对
     The growth of E.
     重组HBD 2对E.
短句来源
     I——RING WITH D. C. C
     满足降链条件的Ⅰ—环
短句来源
     The difference of growth-ring width is not significant.
     生长轮宽度差异不显著。
短句来源
     Growth Ring Wood Property Test Analysis
     树木生长轮材质检测分析法
短句来源
     q -Baer ring.
     q-Baer环.
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  growth ring boundary
The change in specific gravity at the false growth ring boundary is slight and gradual, whereas at the true annual rings boundary the change is steep and abrupt.
      


Anatomical differences between normal wo od and compression wood of masson pine(Pinus massoniana)were studied by means of light and scanning electron microscope.The results show that the normal wood is narrower han the compression wood in growth ring width.The transition from earlywood to latewood is abrupt in normal wood in contrast to the gradual transition in compression wood.In transverse section,normal wood tracheids appear more or less square and rectangular,whereas compression wood tracheids are round...

Anatomical differences between normal wo od and compression wood of masson pine(Pinus massoniana)were studied by means of light and scanning electron microscope.The results show that the normal wood is narrower han the compression wood in growth ring width.The transition from earlywood to latewood is abrupt in normal wood in contrast to the gradual transition in compression wood.In transverse section,normal wood tracheids appear more or less square and rectangular,whereas compression wood tracheids are round in shape with the exception of those at the vicinity of growth ring boundary.In consequence,intercellular spaces are prominent at the junction of tracheids in compression wood.Furthermore,the secondary walls of compression wood tracheids consist of only two layers,S_1 and S_2,in compa- rison with the three layers in normal wood.Helical cavities or checks present only in compres sion wood,spiraling around the tracheid in the same direction as the cellulose microfibrils. Finall(?) the factors responsible for the formation of compression wood are discussed as well.

用光学显微镜和扫描电镜观察比较了马尾松(Pinus massoniana)正常木与应压木的结构差异。研究结果表明:马尾松应压木从早材到晚材呈缓变,管胞在横切面上除生长轮分界处的两侧外均为圆形,管胞之间具明显的胞间隙;管胞的次生壁仅有 S_1和 S_2两层;次生壁上螺纹间隙和螺纹裂隙都很明显,并与 S_2层微纤丝平行。此外,还初步讨论了应压木形成的可能机理。

A kind of silicified fossil wood with mixed pits on the radial tracheid wall is described. The fossil wood was collected from the top of Taiyuan Formation (early Early Permian) in Wuda Mining District, Nei Mongol. Compared with the Paleozoic fossil woods in the world, it is put into Araucarioxylon Kraus and named as A. laoshidanense sp. nov. Based on the character of possessing mixed pittings (alternate and opposite pittings) on the radial...

A kind of silicified fossil wood with mixed pits on the radial tracheid wall is described. The fossil wood was collected from the top of Taiyuan Formation (early Early Permian) in Wuda Mining District, Nei Mongol. Compared with the Paleozoic fossil woods in the world, it is put into Araucarioxylon Kraus and named as A. laoshidanense sp. nov. Based on the character of possessing mixed pittings (alternate and opposite pittings) on the radial tracheid wall, the fossil wood is believed to be one of the unknown primitive conifers.Diagnosis of the new species: Only secondary xylem preserved and consisting of axial tracheids and rays. Growth ring boundary, resin duct and axial parenchyma absent. One to Four (commonly 2 or 3) seriates of bordered pits (mostly alternate but sometimes opposite) on the radial tracheid wall. One to Four (commonly 1, rarely 2 to 4) Cupressoid pits in each cross_field. Rays usually uniseriate, sometimes partly_ biseriate and 2 to 39 (mainly 3-5) cells high.

报道了一种具混合型纹孔 (互列式纹孔和对列式纹孔 )的化石木。化石木产自内蒙古乌达矿区老石旦矿附近太原组上部 ,地质时代为早二叠世早期。经比较 ,确认为南洋杉型木属 (AraucarioxylonKraus)一新种 :老石旦南洋杉型木 (Araucarioxylonlaoshidanensesp .nov .)。根据混合型纹孔的存在及其他特征 ,认为新种可能代表了一种原始的松杉类植物的木材化石。主要特征 :仅保存有次生木质部 ,无生长轮 ,仅由轴向管胞和木射线构成 ,未见轴向薄壁组织和树脂道。管胞排列紧密 ,径向壁具缘纹孔 1~ 4列 ,其中 2~ 3列者较常见。纹孔的排列以互列紧挤为主 ,也有少量对列 亚对列的纹孔。交叉场内多具 1~ 2个柏木式纹孔。木射线多为单列 ,少数为部分双列 ,高 2~ 39个(多为 3~ 5个 )细胞。

The present study was undertaken to investigate fibre morphology and anatomical structure of sandlive willow(Salix psammophila C.Wang et Ch.Y.Yang).Results from light microscopy(LM),scanning electron microscopy(SEM),and Kajaani FS200 analysis showed that anatomical features of S.psammophila exhibited distinct growth ring boundaries exclusive uniseriate rays,diffuse-porous vessels in solitary arrangement,and diversified perforation plates and intervessel pits.The cells are of four types: vessel,fibre,ray...

The present study was undertaken to investigate fibre morphology and anatomical structure of sandlive willow(Salix psammophila C.Wang et Ch.Y.Yang).Results from light microscopy(LM),scanning electron microscopy(SEM),and Kajaani FS200 analysis showed that anatomical features of S.psammophila exhibited distinct growth ring boundaries exclusive uniseriate rays,diffuse-porous vessels in solitary arrangement,and diversified perforation plates and intervessel pits.The cells are of four types: vessel,fibre,ray parenchyma and axial parenchyma.Fibres make up 60 %-70 % of total cells.Although mean fibre length of S.psammophila is 0.52 mm,this fiber is beneficial to pulping and papermaking according to its fine fibre morphology.

采用光学显微镜(LM)和扫描电子显微镜(SEM)并结合Kajaan i FS200分析仪研究了沙柳(Salix psamm ophilaC.W ang et Ch.Y.Yang)的纤维形态和解剖结构。结果表明:沙柳主要由导管、木纤维、木射线薄壁细胞及少量轴向薄壁细胞组成。沙柳属于阔叶木散孔材,年轮界限明显,木射线单列同型、导管上的纹孔排列方式较复杂。通过与毛白杨、麦草和红松的形态学参数比较研究发现,沙柳虽然属于短纤维,纤维平均长度为0.52 mm,但是其纤维含量较高,纤维形态良好,长宽比值较大,壁腔比值较小,有助于在打浆抄纸过程中形成纤维间良好的结合,提高纸张的物理强度,是良好的造纸原料。

 
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