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growth ring
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  生长轮
     The absolute moisture content of green wood,bark percentage and growth ring width are 96.9%,12.99% and 22.82 mm respectively.
     树皮率为12.99%; 生长轮宽度平均为22.82mm。
短句来源
     The paper compares and analyses growth ring width and basic density of Pinus tabulaeformis which grow in Badu forest farm of Longxian county in Shaanxi Province .
     比较分析了陕西省陇县八渡林场油松 ( Pinus tabulaeformis)木材的生长轮宽度、基本密度。
短句来源
     A STUDY ON THE MEASUREMENT OF DENSITY OF WOOD GROWTH RING BY SOFT X-RAY
     软X-射线法测定木材生长轮密度的研究
短句来源
     Forecasting Model of Density of Wood Growth Ring Based on Neural Network
     基于神经网络的木材生长轮密度预测模型
短句来源
     Based on the counts of the growth ring of sagittal otolith and the determination of the monthly basic biology of hairtail Trichiurus haumela specimens collected from the middle and north of the East China Sea (27°N~34°N、west of 126°E )during Dec.2002 to Aug.2004, the relationship between anus length and age of hairtail(a total of 778 specimens)was studied.
     本文利用2002年12月~2004年8月在东海中北部(27°~34°N、126°E以西)所获取的带鱼渔获样品,共采集788ind,每月对带鱼矢耳石生长轮计测和带鱼样品基础生物学测定,研究带鱼年龄与生长之间的关系。
短句来源
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  年轮
     The measurement of power spectra of growth ring demonstrates the variations of period every 2.5, 3.2, 6.3 year under the influence of climatic factor.
     年轮生长的功率谱测定检出,大青杨年轮生长存在2.5、3.2、6.3年的周期,年轮生长的周期性主要是受气象因子影响所致。
短句来源
     The morphological indexes were determined as the average width of growth ring 7.99 mm, the average ratio of fiber length to width 67.26, the average fiber length 0.992 mm, the average fiber width 14.90 μm, the average ratio of double wall thickness to lumen 0.43, the average thickness of fiber wall 4.81 μm, and the average lumen diameter 11.15 μm.
     结果表明:中华南方常绿杨的年轮宽均值为7.99mm、纤维长宽比均值为67.26、纤维长度均值为0.99mm、纤维宽度均值为14.90μm,平均壁腔比为0.43、平均壁厚为4.81μm、平均腔径为11.15μm;
短句来源
     The age models established by the growth ring and carapace length or carapace width predict that the large tortoise (carapace length>180mm) may exceed 24 years in field populations of Xinjiang. The expected longevity would be 28 years.
     30:34(1991),成体龟数目远大于幼体龟的数目,利用年轮与背甲长度或体宽建立年龄模型,模型显示相同年龄的四爪陆龟,雌体生长速度大于雄体,通过年龄模型推测,背甲长度超过180mm的野生四爪陆龟的年龄可达24年,估计四爪陆龟的期望寿命为28年。
短句来源
     Clonal repeatabilities of growth ring densities, early wood densities, late wood densities of air dry timber were 0 89, 0 92 and 0 86 respectitively. This indicated wood densities were under strong genetic controls.
     全年轮密度、早材密度和晚材密度的无性系重复力分别为 0 .89,0 .92和 0 .86 ,说明木材气干密度受到强度遗传控制 .
短句来源
     The results show that, the width of the growth ring reaches its maximum point in its 5~6 years old and the largest volume increment is in its 7~8 years old.
     结果表明,该品系三倍体毛白杨在轮龄5~6年时轮宽最大,7~8年轮龄时材积增长量最大。
短句来源
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  生长环
     Analysis on material composition of growth ring in urban water distribution network
     城市管网生长环物质组成研究分析
短句来源
  “growth ring”译为未确定词的双语例句
     The growth equations of body length and weight are respectively L t=156.75〔1-e -0.089(t-0.016 8) 〕and W t=31 193.17〔1-e -0.089(t-0.0168) 〕 3.1872 . The reasons for growth ring forming and growing characteristics were discussed.
     生长Von Bertalanffy方程分别为Lt = 156 .75〔1 - e- 0 .089(t- 0 .016 8)〕和Wt = 31 193 .17〔1 - e- 0 .089( t- 0 .016 8)〕3 .187 2 。
短句来源
     A 561-year (5.13 ~ 5.69ka B.P.) oxygen isotope time series in the Mid-Holocene is established on the basis of ~(230)Th, annual-layer counting and the Δ~(14)C of growth ring dating results of a stalagmite from Mingling cave at Yixing, Jiangsu province.
     据江苏宜兴茗岭洞穴ML石笋的Th230测年结果、年层计数以及与树轮14C残差曲线的对比,建立了该石笋记录的中全新世持续561年的氧同位素时间序列(5.13~5.69kaB.P.)
短句来源
     The results of the energy spectrum analysis showed that,iron element was the main material of the growth ring,which account for more than 30%.
     能谱分析结果表明,铁元素占生长环的质量分数在30%以上,是生长环的主要组成物质;
短句来源
     Based on the residual of Picea purpurea Mast,some data of stratigraphic age determination and lake-formedgeomorphies,combining with annual growth ring of trees and observing lake water,evolutional history of Qinghai Lake duringnear 8000 years is discussed,further,its developing trend has been briefly forecasted.
     本文依据紫果云杉(Picea purpurea Mast)残木、部分地层测年资料、湖成地貌,结合树木年轮和湖水观测资料,探讨近8000年来青海湖演变史并概略预测其发展趋势:8000—3500a. B.P.
短句来源
     The remarkable positive correlation (r=0.54) between the 3 ~ 4 year resolution oxygen isotope curve and the Δ~(14)C of growth ring curve during the same period reveals that East Asian Monsoon precipitation is positively related to solar activity at centennial time-scale during Mid-Holocene.
     。 分辨率达3~4年的氧同位素曲线与相应时段树轮14C残差呈显著的正相关(r=0.54),揭示了中全新世东亚季风降水百年尺度上受太阳辐射驱动。
短句来源
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  growth ring
An optical and computational method was set up and applied to tree samples (Araucaria angustifolia from Santa Catarina State in Southern Brazil) in order to obtain a growth ring width mean chronology.
      
In the hydrated pea samples, the growth ring structure and blocklet sub-structure of individual starch granules within the seed were visualised directly by atomic force microscopy.
      
Annual stem height, basal diameter, growth ring width, and cumulative wood volume of black spruce were significantly reduced in theLedum sites compared to those of the non-Ledum sites.
      
Optical microscopy and SEM confirmed that in earlywood the region near a growth ring is the weaker area.
      
Analyses are performed for materials with various growth ring widths, and the calculated results are compared with reported experimental observations.
      
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Four simple man-planted Korean pine trees (P. koreiensis Sieb. et Zuce) were selected from CHUO HO COA in northeastern China. The variation in fibrillar angles front earlywood to latewood of growth ring (3th. 12th.and 28th) was tested. The variations in fibrillar angles of latewood, tracheid length in coresponding position and tensile strength from outward pith were studied.The results indicate that fibrillar angles decrease with the increasing of ring number from the pith. There exists a linear...

Four simple man-planted Korean pine trees (P. koreiensis Sieb. et Zuce) were selected from CHUO HO COA in northeastern China. The variation in fibrillar angles front earlywood to latewood of growth ring (3th. 12th.and 28th) was tested. The variations in fibrillar angles of latewood, tracheid length in coresponding position and tensile strength from outward pith were studied.The results indicate that fibrillar angles decrease with the increasing of ring number from the pith. There exists a linear relation of fibrillar angles to tracheid length and tensile strength(a negative correlation) before 24th.The average of fibrillar angles of compression-wood is 37% larger than normal wood, the length of tracheid is 22% shorter and tensile strength is 19% lower than the normal in matured age. A slight positive correlation was found between the width of growth ring and the fibrillar angle of compressed wood.

本文阐述了辽宁省草河口人工林红松木材纤丝倾角和管胞长度的变异规律及其与小试件拉伸强度的关系,并对应压材和正常材进行了比较。结果得出:晚材倾角与管胞长度与小试件拉伸强度成负相关,管胞长度与拉伸强度成正相关。同令期的纤丝倾角在应压材内平均较正常材者约大36.8%,长度约短21.7%,小试件拉伸强度约低18.7%。 在针叶树木材结构上,管胞是组成整个木材体积的绝对主要成分——约占90—95%。管胞长度、直径、壁厚等的变异,直接影响着木材的物理、力学性质。管胞次生壁是胞壁的主要部分,而次生壁中层(S_2)又占整个胞壁的70—90%,故此层对木材性质有着很大影响。40年代迄今,世界各国学者研究木材细胞壁多集中在次生壁中层的探讨上,原因即在于此。 次生壁中层纤丝倾角是决定木材性质指标之一,它影响着许多木材力学性质——如顺纹压力、拉伸、弯曲及顺纹剪力等,又是木材干缩的主要原因。国外对此早在1941年有Phillips、Kollmann等(1943)就美国西加云杉Sitka spruce和松树进行过研究,继之Killer(1954)、Echolls(1955)就沼泽松Slash pine;Jurbergs。(1963)、Ha...

本文阐述了辽宁省草河口人工林红松木材纤丝倾角和管胞长度的变异规律及其与小试件拉伸强度的关系,并对应压材和正常材进行了比较。结果得出:晚材倾角与管胞长度与小试件拉伸强度成负相关,管胞长度与拉伸强度成正相关。同令期的纤丝倾角在应压材内平均较正常材者约大36.8%,长度约短21.7%,小试件拉伸强度约低18.7%。 在针叶树木材结构上,管胞是组成整个木材体积的绝对主要成分——约占90—95%。管胞长度、直径、壁厚等的变异,直接影响着木材的物理、力学性质。管胞次生壁是胞壁的主要部分,而次生壁中层(S_2)又占整个胞壁的70—90%,故此层对木材性质有着很大影响。40年代迄今,世界各国学者研究木材细胞壁多集中在次生壁中层的探讨上,原因即在于此。 次生壁中层纤丝倾角是决定木材性质指标之一,它影响着许多木材力学性质——如顺纹压力、拉伸、弯曲及顺纹剪力等,又是木材干缩的主要原因。国外对此早在1941年有Phillips、Kollmann等(1943)就美国西加云杉Sitka spruce和松树进行过研究,继之Killer(1954)、Echolls(1955)就沼泽松Slash pine;Jurbergs。(1963)、Hatris(1965)、Cave(1966)及Meylen(1967)均进行过详尽的研究。Meylen等(1969)用x—线衍射法测量,并与直接测定比较,得出两种方法间有一良好的线?

Eight forest tree species,namely,Pinus bungeana Zucc.,Pinus tabul-aeformis Carr.,Salix babylonica L.,Populus tomentosa Carr.,Eucommiaulmoides Oliv.,Paulownia elongata S.Y.Hu,Sophora japonica L.,and Ulmuspumila L.,representable conifers,diffuse-porous and ring-porous hardwoodsrespectively,were studied based on the samples collected periodically fromtrunk and crown branch of every tree during 1979 and 1980.Rhythm ofperiodical differentiation in cambial zone and sychronization with the charac-teristics of tissues...

Eight forest tree species,namely,Pinus bungeana Zucc.,Pinus tabul-aeformis Carr.,Salix babylonica L.,Populus tomentosa Carr.,Eucommiaulmoides Oliv.,Paulownia elongata S.Y.Hu,Sophora japonica L.,and Ulmuspumila L.,representable conifers,diffuse-porous and ring-porous hardwoodsrespectively,were studied based on the samples collected periodically fromtrunk and crown branch of every tree during 1979 and 1980.Rhythm ofperiodical differentiation in cambial zone and sychronization with the charac-teristics of tissues and cells developed within a growth ring both in phloemand xylem were founded on facts of developmental anatomy.The trend ofquantity and rate of tissue elements produced at different periods,the relationsto phenology and environmental effects were analysed.All the studied typicalring-porous trees showed quite a different pattern of development as comparedwith others.Among the differences attracted attention,they resumed cambialactivity in spring at the lower portion of trunk apparently much preceded thecrown branch.Some problems on cambial study and its role in the control ofshoot growth,and growth coordination in trees were discussed briefly.Besides,this general comparative study offers some indications that investigation oncambium,the formation of phloem and xylem,and relationship to tree growthshould be integrated.The trend of this integration is worthy to be developed,because it will not only get a better understanding of cambium,but also helpto forest practice for better production of wood and a part of bark.

北京郊区栽植的8种华北树木的形成层季节活动及其韧皮部和木质部的形成进程都具有明显节律。从发育解剖证据总结了各树种在春季恢复活动、主要分生期和进入休眠越冬三个阶段和在主要分生期前后的过渡期的区分,及各期内各类组织细胞的分生情况和结构变化。同时对数量和速度的变化趋势,及物候的关系和环境的影响等作出分析。比较了形成层在冠枝和主干的动态及不同类型树种的差别,对环孔材树种的各种表现取得一些新的证据。通过对8种树的初步比较研究,进一步了解其共性与特性,并认为把形成层动态及韧皮部和木质部的形成相结合并联系树木整体生长等进行综合探索,不仅有利于提高形成层的理论,并将有助于为营林措施和调控木材和部分树皮生长等实际问题提供依据。

The variation of wood structure in normal growth rings and falserings as well as the structure outwards from the pith to bark areinvestigated with four trees of Cunninghamia lanceolata at different agestages. The width of growth rings become gradually narrow with the increaseof the tree-age after about ten years. False rings mainly appear in the wide growth rings near the pith,the number of which may be 1—3.It might be due to changes of temp-erature and moisture in the growing season.False ring always...

The variation of wood structure in normal growth rings and falserings as well as the structure outwards from the pith to bark areinvestigated with four trees of Cunninghamia lanceolata at different agestages. The width of growth rings become gradually narrow with the increaseof the tree-age after about ten years. False rings mainly appear in the wide growth rings near the pith,the number of which may be 1—3.It might be due to changes of temp-erature and moisture in the growing season.False ring always locate's inthe transition region from early to late wood within the growth ring.The sizes of wood elements in false ring are in the range of non-falserings. In normal growth rings,the average length of tracheids in late woodis 21% longer than that in early wood,the thickness of tangential cellwall of tracheids is 55% thicker,and the radial diameter of tracheid is50% smaller than those in early wood. The size of wood elements in growth rings of the first 10th-15thoutwards from the pith increases with the tree-age and undulates inrings there after. There are much warties on the inner surface of tracheid walls andbordered pit.

本文对湖南会同县的杉木木材进行了宏观、微观以及扫描电镜下观察试验。根据4株不同年龄杉木观察,杉木木材构造的变异受生长轮年龄的影响显著;伪轮的出现与生长季中的湿度、温度变化有关. 本试验试图为林业生产单位了解杉木生长规律,确定营林措施提供依据,为杉木木材利用及材质研究提供参考。

 
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