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密度异常
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  density anomaly
     We use the seismic tomography models of Grands and S12-WM13 to estimate the density anomaly distributions in the mantle and take the 660 km discontinuity as a boundary between the upper and lower mantle.
     利用Grands和S12WM13等地震层析成像模型推得的地幔密度异常分布,设置板块绝对运动极型场为运动上边界,考虑深度660km地震波不连续面为界的上、下地幔之间存在黏滞性的差异,直接反演了不同黏滞系数的双层地幔结构下地幔对流的模式.
短句来源
     A new model is employed to investigate the effects of viscous structures on the convection patterns in the mantle, which is driven by density anomaly and plate motions.
     在地震层析成像计算的地幔密度异常直接驱动地幔对流的新方法的基础上,发展了在上、下地幔不同黏性结构框架下,密度异常驱动地幔对流的物理模型.
短句来源
     UPPER MANTLE CONVECTION DRIVING BY DENSITY ANOMALY AND A TEST MODEL
     上地幔密度异常驱动小尺度对流及实验模型
短句来源
     In this case, the orders of disturbing geopotential are selected as l = 2-11, the truncated orders of density anomaly expansion are taken as L = 6 and K - 4, and the damping least squares method is used to solve the observation equations.
     计算中,重力扰动位阶数取为2—11阶,密度异常展开式的截断阶数取为 K=4和 L=6,求解观测方程组时采用阻尼最小二乘法.
短句来源
     According to this mode,latitudinal gravity always pushes the earth's matter toward the region of"latitudinal density anomaly low"from"latitudinal density anomaly high".
     按照这一模式 ,纬向重力总是把地球物质从“纬向密度异常高”的地区推向“纬向密度异常低”的地区 .
短句来源
更多       
  density anomalies
     On this paper we calculate the density anomalies in the mantle by using Su et al's seismic tomography model S12-WM13[1] and the linear relationship between the velocity of seismic wavcform and density [2].
     本文使用S12-WM13[1]层析模型,假设地震波速度异常与密度异常之间呈线性关系[2],以PREM模型[3]为基础,计算了全球和部分区域的球谐展开12×12阶地幔密度异常分布;
短句来源
     The density anomalies result shows that there are two principal density anomalies centers, one is locate on 80°E, 0°N and the other is locate on 240°E, 10°N.
     全球地幔密度异常结果表明存在两个主要的密度异常中心 :一个位于东经 80°,北纬 0°; 另一个位于东经2 40°,北纬 10°附近
短句来源
     DISTRIBUTION OF LATERAL DENSITY ANOMALIES IN THE LOWER MANTLE OBTAINED THROUGH LOW ORDER GEOPOTENTIAL COEFFICIENTS
     利用低阶卫星重力位系数研究下地幔横向密度异常分布
短句来源
     In this paper, we attempt to use satellite gravity data and a new inversion method to study the lateral density anomalies distribution in the mantle.
     本文试图采用卫星重力资料和一种新的反演方法来研究地幔的横向密度异常分布.
短句来源
     This model takes the density anomalies as the driving force for the mantle convection.
     模型首先将地震层析成像确定的地震波速度异常转换为密度异常, 并视其为对流的驱动力;
短句来源
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  density abnormality
     Results: The main signs in diagnossi and differential diagnosis between pancreatic carcinoma and chronic pancreatitis included: (1) focal or diffuse enlargement and density abnormality of pancreas;
     结果:二者诊断与鉴别的主要征象是:(1)病变区胰腺局限或弥漫肿大与密度异常
短句来源
     The result found that the main sign in diagnosis and differential diagnosis between pancreatic carcinoma and chronic pancreatitis included: ①focal or diffuse enlargment and density abnormality of pancreas;
     结果发现二者诊断与鉴别诊断的主要征象是 :1病变区胰腺局限或弥漫肿大与密度异常 ;
短句来源
     Methods Thirty-six patients who had the bone density abnormality appearance in radiograms were collected in this study.
     方法选取在影像学上椎体骨密度异常者36例,其中具夹心椎者12例行腰椎CT扫描。
短句来源
  “密度异常”译为未确定词的双语例句
     Result Coefficient of variation was the sma llest in aluminium body model,the largest in non-vital lumbar vertebral,larger in normal bone-density than abnormal bone-den sity,in L 2-4 0.131%,3.442%,0.542%,1.033%,2.844%respectively.
     结果变异系数铝体模最小,活体以骨密度正常者变异系数较骨密度异常者小,死体最大,其L2~4变异系数各为0.131%、0.542%、1.033%、2.844%和3.442%。
短句来源
     Among the 99 abnormal sperm students, there were 90 students (90 91%) with abnormal motility and/or A grade sperm, 18 students (18 18%) with abnormal concentration, 9 students (9 09%) with abnormal concentration, motility and/or A grade sperm.
     在精子质量异常的 99人中 ,90人精子活率和 /或 A级精子异常 (90 .91% ) ,18人精子密度异常 (18.18% ) ,9人精子密度、精子活率和 /或 A级精子异常 (9.0 9% ) ,未发现无精子者。
短句来源
     And in the rest 94 infertile patients, the percentages of IgG and IgM antibodies in abnormal sperm density group were 21.4%(6/28) and 7.1%(2/28), which were higher than those in normal group, but there were no statistical differences(P> 0.05).
     其余 94例病人中 ,精子密度异常组的精浆抗CT IgG、 IgM抗体阳性率分别为2 1.4% ( 6/2 8)和 7.1% ( 2 / 2 8) ,精子密度正常组则较低 ,分别为 12 .1% ( 8/ 66)和 3 .0 % ( 2 / 66) ,但差异均无显著性 (P均 >0 .0 5 ) ;
短句来源
     in the NDR patients,60 00% is abnormal in P1 wave amplitude of M ERG;
     NDR的 P1 波反应密度异常检出率为 6 0 % ;
短句来源
     The apoptotic rate of sperm in abnormal sperm concentration (sperm concentration<20×10~6·mL~ -1 )group was significantly higher than that in nomal group (P <0.05).
     密度异常组(精子密度<20×106·mL-1)精子凋亡率明显高于密度正常组(精子密度≥20×106·mL-1)(P<0·05);
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  density anomaly
Lateral density anomaly distribution in the lower mantle obtained from satellite low order geopotential coefficients
      
In this paper, we attempt to use satellite gravity data and a new inversion method to study the lateral density anomaly distribution in the mantle.
      
Upper mantle convection driving by density anomaly and a test model
      
Considering the influence of the density anomaly of the crust and upper mantle on the gravity, we provide a new arithmetic to invert the crustal thickness.
      
Upper mantle convection beneath northwest China and its adjacent region driven by density anomaly
      
更多          
  density anomalies
It is assumed that the density anomalies arise because of the initiation of vortex motion in a neutral component after acoustic impulse passage.
      
These processes left behind giant swarms of Precambrian mafic dikes, as well as structurally and genetically related deep-seated morphological and density anomalies.
      
The 2D small-scale convection of the upper mantle underneath the Tianshan Mountains in China driven by the density anomalies is simulated using the hybrid finite element method combining with the marker-in-cell technique.
      
The distribution of density anomalies displays the horizontal diffusion adjustment.
      
We inverted mean crustal density and density anomalies on the different layer in the depth range of 10-100 km, using the gravity field that is treated by separation and adjustment.
      
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The practice and experiments for many years have proved that the calibration of the gravimeter varies with temperature and has great effect on observed values. So it is necessary to find the temperature coefficent of the calibration and to correct the calibration of the observation datao。In this article, the calibration of all gravity data in Bejing, Tianjin and Tangshan regions has is corrected in another way. After the correction, the annual variation of gravity values at various stations is obviously eliminated,...

The practice and experiments for many years have proved that the calibration of the gravimeter varies with temperature and has great effect on observed values. So it is necessary to find the temperature coefficent of the calibration and to correct the calibration of the observation datao。In this article, the calibration of all gravity data in Bejing, Tianjin and Tangshan regions has is corrected in another way. After the correction, the annual variation of gravity values at various stations is obviously eliminated, and has been calculated pre-earthquake gravity anomaly inTangshan. From April, 1974 to March, 1976, the cumulative gravity increased by 1.30μgal and the short-term anomaly approached 200μgal。The obtained results show that. the pre-earthquake gravity variation may bt due to the density anomaly at deep levels of the earth's crust。

多年来的工作实践及实验证明了重力仪格值随温度变化而改变,而且对观测值的影响极大,以致造成虚假异常。本文对京津唐地区重力资料进行格值改算,再计算唐山地震前,唐山测点自74年4月至76年3月累积重力上升了130微伽,由76年3月到7月短期异常近200微伽。根据异常范围、形态、量值计算震前在莫氏界面断裂处有一个密度异常区。

This paper presents the principal characteristics of main ionospheric trough with analysis of observational data from four ionosonde stations located between invariant latitudes A = 46-70°S. The results show following properties of main ionospheric trough: (1) the trough manifests one-self mostly in winter night; (2) the trough has two features: low electron density and large virtual height, (3) the characteristics of equatorial edge and poleward edge of trough are different; (4) the trough is in unceasing motions...

This paper presents the principal characteristics of main ionospheric trough with analysis of observational data from four ionosonde stations located between invariant latitudes A = 46-70°S. The results show following properties of main ionospheric trough: (1) the trough manifests one-self mostly in winter night; (2) the trough has two features: low electron density and large virtual height, (3) the characteristics of equatorial edge and poleward edge of trough are different; (4) the trough is in unceasing motions and variations during night.

本文利用位于不变纬度∧=46°—70°S之间的四个电离层站的观测数据,分析了电离层主糟的基本特性.分析结果表明,电离层主槽有如下特征:(1)槽在冬季夜间出现较为明显,春秋季夜间较弱,夏季夜间和所有季节的白天均观测不到;(2)槽的特点有二,一是其电子密度异常地低,二是层的虚高有较大的增加;(3)槽的极向壁较稳定,且有较陡峭的电子密度梯度,而槽的赤道向壁较多变,电子密度梯度较平缓;(4)槽出现的主要时段是在20:00—03:00(LT),在此期间,槽处于不断的变化和运动之中.

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本文对大地测量应用于地球内部物理研究的几个问题作了评述。大地测量观测到的冰后回升运动是了解地幔非弹性的重要依据;利用大地水准面起伏可验证俯冲带和下地幔处的密度异常分布;对地球近周日摆动频率的检测则对核幔扁率提供了有效的制约条件。

 
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