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轨道调谐    
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  orbital tuning
    Restudy on the Orbital Tuning Time Scale of Deep Core in Qaidam Basin
    柴达木盆地深钻孔轨道调谐时间标尺的再研究
短句来源
    The 20ka and 41ka periodic components filtered from the obtained grain (20-50μm) content time series are consistent with the theoretic cycles of the precession and the tilt, respectively, indicating that the grain (20-50μm) content record of Donggou Section can be used as the climatic curve for orbital tuning.
    新的粒度(20~50μm)含量时间序列滤波获得的20ka和41ka的周期成分与岁差及地轴倾斜度的理论值可以重合. 这显示洞沟剖面的粒度(20~50μm)含量记录可以作为轨道调谐的气候曲线.
短句来源
    Using high resolution Gamma Logging Curve of Dancan1 Core,Qaidam Basin,we establishes orbital tuning time scale based on newly derived estimated ages for magnetic reversals.
    本文采用柴达木盆地达参1井高分辨率自然伽玛(GR)曲线进行轨道调谐,建立了基于较新古地磁倒转年代的轨道调谐时标.
短句来源
    Test of noise confidence level,bandpass filter results in comparison with theoretical calculated value of orbital elements and orbital tuning time scale,shows that orbital tuning time scale of Dacan1 Core has high reliability,it also gives time series framework for discussing different time scale climate change.
    红噪声显著性检验和深度域带通滤波结果与轨道要素理论计算值及调谐时标的对比均表明,本文所建立的GR曲线轨道调谐时标具有很高的可信性,为讨论盆地不同尺度气候变化构建了年代序列框架.
短句来源
    An automatic orbital tuning method has been applied in this study, which is more efficient than those used at ODP Site 659 and 846. The results show that the 190.77 m long deep sea sediments in the South China Sea have recorded a paleoceanographic history of ~5.02 Ma, corresponding to 191 glacial/interglacial cycles. The tuned Brunhes/Matuyama paleomagnetic polarity reversal agrees well with an age of 0.78 Ma dated previously.
    调谐方法采用了有别于ODP6 5 9站和ODP84 6站的自动轨道调谐方法 (YuandDing ,1998) . 调谐结果显示 ,114 3站 190 .77m、191个冰期、间冰期的深海沉积记录了 5 .0 2Ma的南海古海洋学历史 ;
短句来源
更多       
  orbital tuning
    Restudy on the Orbital Tuning Time Scale of Deep Core in Qaidam Basin
    柴达木盆地深钻孔轨道调谐时间标尺的再研究
短句来源
    The 20ka and 41ka periodic components filtered from the obtained grain (20-50μm) content time series are consistent with the theoretic cycles of the precession and the tilt, respectively, indicating that the grain (20-50μm) content record of Donggou Section can be used as the climatic curve for orbital tuning.
    新的粒度(20~50μm)含量时间序列滤波获得的20ka和41ka的周期成分与岁差及地轴倾斜度的理论值可以重合. 这显示洞沟剖面的粒度(20~50μm)含量记录可以作为轨道调谐的气候曲线.
短句来源
    Using high resolution Gamma Logging Curve of Dancan1 Core,Qaidam Basin,we establishes orbital tuning time scale based on newly derived estimated ages for magnetic reversals.
    本文采用柴达木盆地达参1井高分辨率自然伽玛(GR)曲线进行轨道调谐,建立了基于较新古地磁倒转年代的轨道调谐时标.
短句来源
    Test of noise confidence level,bandpass filter results in comparison with theoretical calculated value of orbital elements and orbital tuning time scale,shows that orbital tuning time scale of Dacan1 Core has high reliability,it also gives time series framework for discussing different time scale climate change.
    红噪声显著性检验和深度域带通滤波结果与轨道要素理论计算值及调谐时标的对比均表明,本文所建立的GR曲线轨道调谐时标具有很高的可信性,为讨论盆地不同尺度气候变化构建了年代序列框架.
短句来源
    An automatic orbital tuning method has been applied in this study, which is more efficient than those used at ODP Site 659 and 846. The results show that the 190.77 m long deep sea sediments in the South China Sea have recorded a paleoceanographic history of ~5.02 Ma, corresponding to 191 glacial/interglacial cycles. The tuned Brunhes/Matuyama paleomagnetic polarity reversal agrees well with an age of 0.78 Ma dated previously.
    调谐方法采用了有别于ODP6 5 9站和ODP84 6站的自动轨道调谐方法 (YuandDing ,1998) . 调谐结果显示 ,114 3站 190 .77m、191个冰期、间冰期的深海沉积记录了 5 .0 2Ma的南海古海洋学历史 ;
短句来源
更多       
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  orbital tuning
These events are dated with the time scales established using the recently-developed approach of Automatic Orbital Tuning.
      
The interferograms calculated with the post-fit orbital estimates compare favorably with those corrected with a conventional orbital tuning approach.
      
This reflects the lower accuracy of the correlation method with respect to direct orbital tuning.
      
(in press) derived by orbital tuning of the Vostok δD record.
      
We propose a new automatic orbital tuning algorithm to adjust climatic signals to insolation.
      
更多          


In Baoji loess-soil section,a total of 1630 samples was taken at an interval of 10cm.Grain size was analyzed for each sample using a Sedigraph 500 E Analyzer in Xi'an Lab ofLoess and Quaternary Geology,Chinese Academy of Sciences.The ratio of the fraction largerthan 10μm to that finer than 2μm is used as an indicator of the variation in wind velocitywhich transported the loess grains from deserts to the Loess Plateau.Visual examination showsthat loess units have larger grain size than soils,suggesting stronger...

In Baoji loess-soil section,a total of 1630 samples was taken at an interval of 10cm.Grain size was analyzed for each sample using a Sedigraph 500 E Analyzer in Xi'an Lab ofLoess and Quaternary Geology,Chinese Academy of Sciences.The ratio of the fraction largerthan 10μm to that finer than 2μm is used as an indicator of the variation in wind velocitywhich transported the loess grains from deserts to the Loess Plateau.Visual examination showsthat loess units have larger grain size than soils,suggesting stronger winds in glacial periodsthan during interglacial periods.This grain-size record is then used to develop an astronomi-cal time scale for Chinese loess deposits by the following procedures.1.An initial time scale was established under paleomagnetic controls based on the assump-tion that loess deposition rate during glacial periods is twice higher than that in interglacialperiods.2.The maxima/minima of the grain-size record in the initial time scale is then matched byadding new time control points with maxima/minima of the theoretical variation in the or-bital parameters of the Earth calculated by Berger (1978).3.Using spectral filtering technique,the orbital components were filtered from the grain-size record,and were then designed to be superimposed on the orbital target by stretching andcompressing the initial time scale.The procedure 3 was repeated for about 55 times.An orbitally-tuned time scale is thenobtained with the magnetic boundaries remaining basically unchanged with respect to the ra-diometric ages.The filtered components of the orbital periods from the orbital time scale areexcellently superimposed on the theoretical variations.Based on the astronomical time scale,ages for the thirty-seven major soils in the Baoji section were estimated.

作者对宝鸡黄土剖面的粒度组成以10cm 为间隔进行了系统的采样和分析,并以这条粒度曲线为基础,建立了一条适合黄土高原各代表性剖面的轨道调谐时间标尺。据此对37个古土壤的顶、底年龄作了估计。在建立这条时间标尺的过程中,各古地磁界线的K-Ar 年龄值基本保持不变。时间标尺建立后,对地轴倾斜度和岁差的特征周期进行了滤波,发现滤波曲线与理论计算值有很好的匹配。对比已有的两条深海轨道调谐时间标尺,宝鸡剖面时间标尺在时间分辨率及滤波曲线与理论计算值相匹配方面具有一些明显的优点。

A high--resolution sampling spacing 5cm in loess and 3cm in paleosol layers was finished for the 140 - meter-depth classic loess profile in Luochuan, central Chinese loess plateau in the summer of 1993. Magnetic susceptibilities of all samples were measured in Xi'an Laboratory of Loess and Quaternary Geology. We employ the magnetic susceptibility as proxy indexes of palaeomonsoonal climate change during the past 2. 5Ma. Based on the Milankovitch theory of Pleistocene ice ages, a preliminary time scale for this...

A high--resolution sampling spacing 5cm in loess and 3cm in paleosol layers was finished for the 140 - meter-depth classic loess profile in Luochuan, central Chinese loess plateau in the summer of 1993. Magnetic susceptibilities of all samples were measured in Xi'an Laboratory of Loess and Quaternary Geology. We employ the magnetic susceptibility as proxy indexes of palaeomonsoonal climate change during the past 2. 5Ma. Based on the Milankovitch theory of Pleistocene ice ages, a preliminary time scale for this loess profile was set up. By comparing with the absolute magnetic reversal ages and orbital tuning time scale for Baoji loess section, it is proved that. our time scale is useful for the palaeoenvironmental study around this region.

对厚140m的洛川坡头黄土剖面黄土层以5cm、古土壤层以3cm系统采样,全部样品进行了室内磁化率测量。以黄土序列磁化率变化作为古季风气候变化的代用指标,根据第四纪冰期的Milankovitch理论,利用轨道调谐的方法初步建立了洛川黄土地层的时间标尺。通过古地磁场倒转时间的检验以及与宝鸡黄土序列时间标尺对比,表明本文所论述的时间标尺适用于该地区古环境演化的研究。

A brief account of the history of scientific ocean drilling is given by summarizing the main achievments made both by Deep Sea Drilling Program (DSDP) and Ocean Drilling Program (ODP). DSDP revolutionized the earth scientists′view of the Earth′s dynamic processes. Its successor, the ODP, is collecting high resolution records of changes in these processes over time scales of tens to hundreds of thousands of years. Major achievements have been made in the following aspects: the magnitude, speed and origin of climate...

A brief account of the history of scientific ocean drilling is given by summarizing the main achievments made both by Deep Sea Drilling Program (DSDP) and Ocean Drilling Program (ODP). DSDP revolutionized the earth scientists′view of the Earth′s dynamic processes. Its successor, the ODP, is collecting high resolution records of changes in these processes over time scales of tens to hundreds of thousands of years. Major achievements have been made in the following aspects: the magnitude, speed and origin of climate changes in the geological history, astronomically tuned geological time scale, the formation and evolution of ice sheets in high latitude regions, relationship between orogeny and long term climate change and the role gas hydrate may play in the global climate change. The achivements have enabled scientists to believe that drilling into the young ocean crust with continuous, undisturbed sedimentary and logging record will provide most efficient and significant insights into the research on the past global climate changes, as well as on future global climate changes.

文章简要地回顾了科学大洋钻探的发展历程。深海钻探计划(DSDP)革命性地改变了地球科学家们对地球动力作用的认识。DSDP的后继者,即大洋钻探计划(ODP)正在全球各大洋收集有关这些作用在几万至几十万年时间尺度上变化的高分辨率记录,并已在与全球气候有关的下述领域取得了重要进展:地质历史时期气候变化的幅度、速度及原因,按轨道调谐的新生代(10Ma前以来)地质年代表,高纬度地区冰盖形成及演化历史,造山运动与长期气候变化之间的相互关系,气体水合物与全球气候变化的相互制约关系。DSDP和ODP的成就使地球科学家们相信,在全球年轻的大洋底实施钻探以取得连续的沉积记录和录井记录,是研究过去全球气候的长期、短期变化的有效而重要的手段,并将给未来全球变化的研究带来启示

 
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