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arctic pole
相关语句
  北极
     The Arctic pole, 35℃ below zero.
     北极。 摄氏零下35度。
短句来源
     (3) The center of northern polar vortex is not at Arctic pole. The percentage of the polar vortex size in each quadrant hasdistinct difference,and it varies from January to December,which is close related to thermodynamic difference over sea-land.
     (3)北极涡中心位置通常并不在北极点,各分区极涡总面积所占的百分比有明显差异,且有月际变化,这些差异与海陆热力差异造成的环流的差异密切相关;
短句来源
     There is no significant correlation between the Arctic pole region and tropic region,so as correlation between Antarctic region and Arctic region.
     在共振的特定频率中,北极位势高度振荡落后于南极位势高度,赤道位势高度振荡又落后于两极位势高度振荡,气候变化最先开始的区域为南极地区.
短句来源
     Chi Zijian has been persisting in describing his underdeveloped mountain, waters and scenery of his town "the Arctic Pole Village",which is close to human primitive look since she entered the liteary world in the 1980s.
     从80年代中期步入文坛直到今天,迟子建一直执著地抒写着她的故乡"北极村"那些尚未被开发的、接近人类原初风貌的山水风物。
短句来源
     The abrupt events of climatic change in the ten,century time scale from a stalagmite record has an analogy with the events of the ice core records,and reflected that the monsoon climate from stalagmite records in the low latitude region is provided a wonderful relativity with the climate change in the high latitude region and the arctic pole. The above study has the important scientific significance for knowing the change of modern climate system,climatic forecast and driving mechanism of climatic evolution in the future.
     石笋记录的这种百年、十年尺度的突发性气候变化事件,与冰芯记录极为相似,反映低纬度地区石笋记录的季风气候与高纬度及北极地区的气候具有极好的相关性,这对于认识现代气候系统变化以及对未来十年—百年尺度的气候预测和演化的驱动机制,具有重要的科学意义。
短句来源
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  “arctic pole”译为未确定词的双语例句
     Models for Flyiny over the Arctic Pole
     飞越北极模型
短句来源
     The center of northern polar vortex is not at Arctic pole. The center of polar vortex mainly displace towards Asia, departure form Europe, but stronger trend to the Pacific.
     极涡呈现偏心结构,极涡中心位置主要偏向亚洲大陆,偏离欧洲大陆,但有较强的偏向太平洋一侧的趋势。
短句来源
  相似匹配句对
     Models for Flyiny over the Arctic Pole
     飞越北极模型
短句来源
     The Arctic pole, 35℃ below zero.
     北极。 摄氏零下35度。
短句来源
     The Melting Arctic
     消融的北极——阿拉斯加极地文化的衰落
短句来源
     The Freezing Arctic
     冰封的北极——格陵兰人的传统极地生活
短句来源
     Dominant Pole and Dipole
     主导极点与偶极子的关系
短句来源
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  arctic pole
Hence Lovelock's dire prediction about breeding pairs at the Arctic pole.
      


As to the problem of the time needed for an airplane to start from Beijing,fly over arctic pole,and reach Detroit,this article discusses how much time can be saved in the models that established in the article in comparison with the original flight route.And it summarizes selection of the flight route for searching the shortest arc in the surface.Discussion is based on the fact that the shortest arc on surface is geodesic.Model 1 is on the assumption that the Earth is a sphere.It can be solved by...

As to the problem of the time needed for an airplane to start from Beijing,fly over arctic pole,and reach Detroit,this article discusses how much time can be saved in the models that established in the article in comparison with the original flight route.And it summarizes selection of the flight route for searching the shortest arc in the surface.Discussion is based on the fact that the shortest arc on surface is geodesic.Model 1 is on the assumption that the Earth is a sphere.It can be solved by the relation between inner- product and included angle of two unitvectors.Model2 is on the assumption thatthe Earth is a revolving ellipsoid.Itcan be solved by the geodesic equation in differential geometry,which turns latitude of the Earth into thatof ellipsoid.For the4pairs of special points,their latitudes or longitudes are too close to calculate geodesic,so we replace geodesic with ellipse arc,and use software Mathematica to obtain the length

本文对“飞机从北京出发、飞越北极直达底特律的所需时间 ,可比原航线节省多少时间”的问题进行讨论 ,并将航线选择归结为寻求曲面上的最短弧 .应用“曲面上最短弧为测地线”的事实进行了讨论 .模型 (一 )假设地球是球体 ,我们可通过单位向量的点乘与夹角的关系 ,加以解决 ;对于模型 (二 )设地球是旋转椭球体 ,我们利用微分几何学中测地线方程加以解决 ,并且把球面的纬度转化为旋转椭球面纬度 .对于 4组较特殊的点 ,纬度几乎相等或相近 ,或者两者之间的经度差过大时 ,用测地线计算比较困难 ,我们用椭圆弧 (长 )代替测地线长 ,结合数学软件 Mathematica的数值积分功能 ,可求得测地线长

Northeast China Transect (NECT) is a transect designated for Global Change and Terrestrial Ecosystem Program (GCTE) and recognized by the International Geographical and Biological Plan (IGBP) as one of the four major global transects (GCTE core project office 1994). It extends from the northern Changbai Mountains of Jilin Province through the Songliao plain to the plateau of Inner Mongolia, at approximately 112~130°30′ E and 43°30′~44°30′ N. The altitudes range from 120 to 1700m along the NECT. Along the transect...

Northeast China Transect (NECT) is a transect designated for Global Change and Terrestrial Ecosystem Program (GCTE) and recognized by the International Geographical and Biological Plan (IGBP) as one of the four major global transects (GCTE core project office 1994). It extends from the northern Changbai Mountains of Jilin Province through the Songliao plain to the plateau of Inner Mongolia, at approximately 112~130°30′ E and 43°30′~44°30′ N. The altitudes range from 120 to 1700m along the NECT. Along the transect from east to west, there are decreasing gradients of precipitation and temperature as well as variations in plant communities and the soil nitrogen content. Quadrats along the NECT were set up and the number, coverage and frequency of each species were investigated from 14 July to 1 August 1997. Based on the data, the richness and importance of each species were calculated. The distribution and the role of clonal plants in the communities along the NECT were investigated. Regression analysis was used to discover the relationship between importance of clonal plants and environmental factors.Our result show that the positions of clonal plants in phylogenetic tree were different significantly. They occurred in most of the families. Out of 315 plant species occurred in the NECT, 155 were clonal plant species. They belong to 38 families and 88 genus respectively. The result supports the multi originated hypotheses of plant clonality. It was evident that there were more abundant clonal plants in monocots than that of in dicotyledon species, indicating a strong phylogenetic factor in evolution of clonality although this does not preclude ecological interpretations. 155 clonal plants belong to 15 geographic elements respectively. Clonal plants were abundant in Dahurica Mongolia and Pan Arctic pole component and scarce in North China, Ancient Mediterranean, Europe Sibiricum and World component. Clonal plants commonly were perennial grasses and shrubs, but less were annual and woody species. Plant species with different clonal growth from were unevenly and non randomly distributed among 155 clonal plants and plant families. Rhizomatous clonal plants were abundant. However, tuberous, bulbous and stoloniferous clonal plants were scarce, and were restricted to Rosaceae and Liliaceae respectively.Clonality was unevenly distributed over the six vegetation types along the NECT. Species relative frequency of clonal plants ( C/P t ) and relative importance value of clonal plants ( IV ) along the environmental gradient in NECT show a ascending trend from the east to the west. Clonal plants were abundant in the typical steppe and the desert steppe. Clonal plants played a more important role in the typical steppe and the desert steppe than that in other vegetation types. Species relative frequency as well as importance of clonal plants was negatively correlated to total nitrogenous content in the soil (N) respectively, and positively correlated to elevation respectively, but not significantly correlated to mean annual temperature or annual precipitation respectively. The correlations between the number of clonal plants, non clonal plants and elevation, mean annual temperature or annual precipitation were not significant,and the same pattern to non clonal plants. While the number of clonal plants tended to negatively correlate to N, but the correlation was not significantly at p =0.05, which is contrary to non clonal plants. These indicates that the occurrence of clonal plants and non clonal plants varied markedly different among the plant communities of NECT. Clonal plants were adaptive under stressed conditions such as in lower soil nitrogen content and drier habitats, whereas non clonal plants were favored under more optimal conditions, which imply that clonality may have great significance in the evolutionary processes.There was marked difference in the distribution of clonal growth forms along NECT. Rhizomatous, tillering, bulbous and tuberous types occurred in the most of communities.

1 997年野外调查资料 ,对中国东北样带克隆植物沿样带的分布、克隆植物在群落中的重要性以及其与环境因子之间的关系进行了研究。结果表明 :克隆植物相对种数 ( C/ Pt)和克隆植物相对重要值 ( IV)随样带上环境梯度变化呈增加的趋势。群落中克隆植物相对种数与土壤全氮含量负相关 ,与海拔高度正相关 ,与年平均温度和年降水相关不显著 ;克隆植物相对重要值与土壤全氮含量负相关 ,与海拔高度正相关 ,与年平均温度和年降水相关不显著。研究还发现 ,群落中克隆植物种数与非克隆植物种数随样带上海拔高度、年平均温度、年降水梯度变化相关性较差 ,而克隆植物种数与土壤全氮含量负相关不显著 ,非克隆植物物种数与土壤全氮含量正相关不显著。根茎型、分蘖型及鳞茎球茎型克隆植物在土壤湿度较差的生境中出现频率较高 ,而匍匐茎型、根茎鳞茎及根茎球茎型克隆植物在土壤湿度较好的生境中出现频率较高

The article discusses how much time would be saved for a flight from Beijing to Detroit directly over arctic pole instead of the original route. The best choice is defined as searching for the shortest arc on the curved surface. The discussion is based on the fact that the shortest arc on surface is geodesic.Model l is on the assumption that the Earth is a sphere. It can be solved by the relation between point product and angle of two unit vectors.Model 2 is on the assumption that the Earth is a revolving...

The article discusses how much time would be saved for a flight from Beijing to Detroit directly over arctic pole instead of the original route. The best choice is defined as searching for the shortest arc on the curved surface. The discussion is based on the fact that the shortest arc on surface is geodesic.Model l is on the assumption that the Earth is a sphere. It can be solved by the relation between point product and angle of two unit vectors.Model 2 is on the assumption that the Earth is a revolving elliptical sphere It can be solved by geodesic equation in differential geometry,which turns latitude of the Earth into that of elliptical sphere. For the 4 pairs of special points, their latitudes or longitudes is too close to calculate geodesic,so we replace geodesic with ellipse arc,and use software Mathematica to obtain the length.

对“飞机从北京出发 ,飞越北极直达底特律所需时间可比原航线节省多少”的问题进行讨论 ,并将航线的选择归结为寻求曲面上的最短弧 ,应用“曲面上最短弧为测地线”的事实 ,分两种情况展开讨论 :模型一 :假设地球是球体 ,则测地线恰好是大圆 ,而球面上两点间的最短弧 ,就是其所在大圆对应的劣弧 ,我们可通过单位向量的点乘与夹角的关系加以解决 ;模型二 :假设地球是旋转椭球体 .我们利用微分几何学中测地线方程及曲线的弧长公式 ,并且把球面的纬度转化为旋转椭球面纬度 ,对于 4组较特殊的点 ,纬度几乎相等或相近 ,或者两者之间的经度差过大 ,用测地线计算比较困难 ,我们用椭圆弧长代替测地线 ,结合数学软件Mathe matica可求得测地线长

 
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