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annual variations
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  年变化
     2°× 2° mean monthly COADS grid data (1970-1979) are used to compute the net longwave radiation and fluxes of sensible and latent heat over the tropical Pacific and Indian Ocean (30°S - 30°N) and their seasonal and annual variations.
     本文利用1970—1979年COADS2°×2°格点月平均资料,计算了30°S—30°N热带太平洋和印度洋洋面上的有效长波辐射、感热和潜热通量以及它们的季节变化和年变化
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     Among these components,annual variations of nutrient contents in leaves were the most obvious,and its variation value was 82.6% for N,82.2% for P,(84.7%) for K,85.7% for Ca,and 88.7% for Mg respectively.
     两个杨树无性系营养元素氮、磷、钾、钙、镁均以叶中元素含量的年变化幅度最为明显,分别为82.6%、82.2%、84.7%、85.7%和88.7%;
短句来源
     It has been found that their annual variations are quite good agreement with that of surface net radiation, but there are some differences in Hexi and Plateau regions, even in west and east parts of Hexi area.
     结果表明:河西走廊各站地面感热通量的年变化与地面净辐射能收支的年变化完全一致,此特点与高原不同; 在该区内地面感热通量的年变化有明显的地域差异;
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     A harmonic analysis indicates that annual variations are dominated by wave one .
     谐波分析表明,旬降水量年变化以1波为主。
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     ANNUAL VARIATIONS IN DIRECTION OF EARTH RESISTIVITY AND THE TECTONIC STRESS FIELD IN CONTINENTAL CHINA
     地电阻率年变化的方向性与中国大陆构造应力场
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  年际变化
     Seasonal and annual variations of marine sinking particulate flux during 1993~1996 in the central South China Sea
     1993~1996年南海中部海洋沉降颗粒通量的季节和年际变化
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     Comparisons on Seasonal and Annual Variations of δ~(18)O in Precipitation
     降水中δ~(18)O月变化和年际变化的比较
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     Based on the observed meteorological data from 1957 to 2002,an analysis was made of seasonal and annual variations of dynamic evaporation and thermal evaporation,their differences,and their contributions to the total amount of evaporation of 5 regions in North China,as well as the trend of their variations for recent 20 years under the condition of global warming.
     选用1957~2002年的气象观测资料,对华北地区5个分区动力和热力蒸发量的季节、年际变化规律,动力和热力蒸发量之间的差异,动力和热力蒸发量对总蒸发量的贡献以及近20年全球变暖背景下华北地区动力和热力蒸发量的变化趋势进行了分析.
短句来源
     Our observations indicate that these seasonal and annual variations are mainly controlled by the changes of surface primary productivity and hydrological conditions related to the East Asian monsoon.
     研究表明这种季节和年际变化主要受与东亚季风相关的表层初级生产力和海洋水文条件变化的控制
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     Seasonal and annual variations occurred for size-structure and size-fractionated phytoplankton biomass, for examples, biomass of all three-size phytoplankton in Aug., 1997 was lower than that in Aug., 1998 and 1999;
     粒级组成和各粒级生物量存在着明显的季节和年际变化 ,如1 997年夏季三种粒级浮游植物生物量均明显低于其它年份 ,PICO和MICRO组份呈 1 998年夏季高于 1 997年和 1 999年夏季 ,而NANO组份则呈 1 998年夏季低于1 997年和 1 999年夏季 .
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  年变化特征
     By use of the NCEP/NCAR January 1958~December 1999 reanalysis data and the AO and AAO indices, some characteristics of annual variations of the Arctic and Antarctic Oscillations are studied, and annual variations of correlation coefficients between some meteorological elementary field and the AO and AAO indices are also investigated.
     作者利用 1 95 8年 1月~ 1 999年 1 2月的NCEP/NCAR全球再分析月平均资料、北极涛动指数IAO和南极涛动指数IAAO来研究AO和AAO的年变化特征以及AO和AAO与纬向平均的月平均各要素场的相关系数随纬度和月份的变化规律。
短句来源
     Regional Distribution of Annual Variations of Dekad Precipitation in China and Study on Forecast
     中国旬降水年变化特征的区域分布和可预报性研究
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     Regional Distribution of Annual Variations of Dekad Precipitation in China
     我国旬降水年变化特征的区域分布
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     Using Rotated Empirical Orthogonal Function (REOF) to analyze the annual variations of China dekad precipitation based on dekad precipitation data averaged over 1955-1998,the annual variations of the precipitation are divided into 6 categories which cover 8 regions geographically.
     利用全国多年平均旬降水资料 ,通过旋转 EOF分解 ,将全国各地旬降水的年变化特征划分为 6大类别 ,在地理分布上归属为 8个区域。
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     THE CHARACTERISTIC ANNUAL VARIATIONS IN HEAT BALANCE COMPONENTS OVER THE SOUTH-CHINA SEA AND WESTERN PACIFIC AND ITS RELATIONSHIP WITH SYNOPTIC SYSTEMS
     南海—西太平洋海域热量平衡各分量的年变化特征及其与天气系统的关系
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  “annual variations”译为未确定词的双语例句
     Annual variations in the meteorological parameters at Jinnah Station,East Antarctica
     Annual variations in the meteorological parameters at Jinnah Station,East Antarctica
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     Moreover, there were daily, seasonal and annual variations in the atmosphere. The impact of lead pollution in environment on children health was serious in Shenyang city. The blood lead content of the children (ZPP>2.3μmol/L) with the age of 0~10 ranged from 10.98 to 511.2μg/L,and the average of 135.59μg/L.
     沈阳市环境铅污染已经影响了儿童健康 ,0~ 1 0岁儿童 (ZPP >2 3μmol/L)血铅范围是 1 0 98~ 5 1 1 2 μg/L ,平均值是 1 35 5 9μg/L ,4 0 %的儿童血铅水平超标 .
短句来源
     The annual variations of Hyp content(X)and AKP activity(Y) in serum were significant correlation. The regression equation was Y=5.34+13.26X(r=0.55 n=25).
     血清的羟脯氨酸含量(X)和碱性磷酸酶活性(Y)在年周期变化上呈极显著正相关(P<001),其回归方程为Y=5.34X+13.26(r=0.55,n=25)。
短句来源
     Annual variations in serum thyroxine(T 4) and triiodo L thyronine(T 3) concentrations were measured by double antibody radioimmunoassay in the blunt snout bream(Megalobrama amblycephala).
     运用双抗体放射免疫测定法研究团头鲂 (Megalobramaamblycephala)血清中甲状腺素 (T4 )和三碘甲腺原氨酸 (T3 )浓度的周年变化。
短句来源
     PROBABILITY DISTRIBUTION OF STRONG EARTHQUAKES WITH ANNUAL VARIATIONS IN STRAIN RELEASE IN XINJIANG ( M >6. 0)
     新疆6级以上地震年应变释放的概率分布
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  annual variations
Annual Variations in the Moisture Content of Gray Silts in a Reservoir
      
Relations between annual variations in sediment moisture content in the channel section of the Mozhaisk Reservoir, on the one hand, and bottom temperature and reservoir water level, on the other hand, are discussed.
      
Transport calculations are made using a complex graphic method with geostrophic approximation, which takes into account the results of instrumental observations of flow velocities, sea level variations, and annual variations in the water volumes.
      
The model was used to evaluate annual variations in the concentrations of organic and mineral fractions of these elements and the biomasses of planktonic organisms for the five areas in the bay.
      
A model of a nonstatioary Markov chain is proposed for the description of regularities in the intra-annual variations in the level of a drainless water body.
      
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Integrating with respect to time the equation for the balance of angular momentum of the atmosphere north of certain latitude (30°N say)we obtainIn the above equation ρ is thedensity; (?), the zonal wind; v, the meridional wind; R, the earth's radius; Ω, the angular speed-of the earth's rotation; dm, the mass element of the atmosphere; dτ, the volume element; ds, the area element on the earth's surface, and dσ, the urea element on the vertical surface over the latitudial circle of 30°N. The first two terms (in...

Integrating with respect to time the equation for the balance of angular momentum of the atmosphere north of certain latitude (30°N say)we obtainIn the above equation ρ is thedensity; (?), the zonal wind; v, the meridional wind; R, the earth's radius; Ω, the angular speed-of the earth's rotation; dm, the mass element of the atmosphere; dτ, the volume element; ds, the area element on the earth's surface, and dσ, the urea element on the vertical surface over the latitudial circle of 30°N. The first two terms (in the parenthesis) On the left side of (2) are evaluated from the mean westerlies in summer and winter given by Mintz. The last two terms on the left and the first two terms on the right side of (2) are evaluated from the mean surface pressure charts of July and January. The transfer of angular momentum across latitude 30°N given by Starr and White is used to evaluate the 3rd. term on the right. Then the value of the last two terms in the parenthesis on the right of (2) is calculated. The result agrees very well with that obtained by other authers.It is further found that: 1. From summer to winter the transfer of angular momentum from low to high latitudes by gross weather systems overcompensates the destruction by the earth's surface. The small residue of these two factors acounts for the main part (about85%)of increase of westerly circulation from summer to winter. The remaining small part of the increase of the westerly circulation may be acounted for by the advection of mass of the atmosphere, which carries the angular momentum due to earth's rotation (difference between the first two terms on the right and the last two terms on the left side of (2)).2. The transfer of angular momentum or the destruction of angular momentum, as well as the intensity of the westerly circulation has annual variation. However this annual variation is not of sine or cosine type, i,θ, the variation from summer to winter is not the opposite of that from winter to. summer. The property of this asymmetry is explained by the irreversible heat addition and subtraction. From winter, to summer heat is added to, and summer to winter heat is subtracted from the atmosphere (N.H.). Since the process of adding and subtracting heat is irreversible, the variation from summer to winter can not be symmetric to that from winter to summer.3. Transfer of angular momentum from easterlies to westerlies occurs mainly in the period of breakdown of zonal circulation (low index), mainly in the belt of longitudes of"extended troughs" (troughs extending from high to low latitudes) and "extended ridges" (ridges extending from low to highlatitudes), and mainly in the high levels of the atmosphere.

把30°N以北大气角動量平衡方程由七月積分到一月,則其中各項都可計算:此緯度以北大气相对西風角動量的改变可用Mintz平均西風冬夏分佈圖算出;地轉角動量的改变可用冬夏地面平均气压圖算出;通过30°N緯度的角動量的渦動輸送已为Starr和White算出,因此利用積分結果可求得30°N以北地面应力和山脈东西兩側气压差所引起的角動量消耗,結果与别的作者用别的方法所得數值極为符合。 作者更指出: 1.从夏到冬大型天气系統的角动量輸送勝过地面摩擦的消耗,从夏到冬西風环流增强的主要部分(約85%)即由於二者之差,西風环流增强的其餘一小部分則由於大气的質量平流,而引起地轉角動量的傳送。 2.角動量的输送,角動量的消耗以及西風环流强度都有年变化。但这种年变化並非正餘弦型,即从夏到冬的变化並不正是从冬到夏变化的反面,此种非对称性可由加熱过程和减熱过程的不可逆性解釋。在北半球从冬到夏对大气來说是加熱的,而从夏到冬大气失去熱量,因为加熟过程和減熱过程都不是可逆的,故从夏到冬的变化也不与从冬到夏的变化对称。 3.东風帶向西風帶的角動量輸送,主要發生於西風环流破坏的時候;主要發生於“引伸槽”和“引伸脊”的經度帶;同時也主要發生於大气的...

把30°N以北大气角動量平衡方程由七月積分到一月,則其中各項都可計算:此緯度以北大气相对西風角動量的改变可用Mintz平均西風冬夏分佈圖算出;地轉角動量的改变可用冬夏地面平均气压圖算出;通过30°N緯度的角動量的渦動輸送已为Starr和White算出,因此利用積分結果可求得30°N以北地面应力和山脈东西兩側气压差所引起的角動量消耗,結果与别的作者用别的方法所得數值極为符合。 作者更指出: 1.从夏到冬大型天气系統的角动量輸送勝过地面摩擦的消耗,从夏到冬西風环流增强的主要部分(約85%)即由於二者之差,西風环流增强的其餘一小部分則由於大气的質量平流,而引起地轉角動量的傳送。 2.角動量的输送,角動量的消耗以及西風环流强度都有年变化。但这种年变化並非正餘弦型,即从夏到冬的变化並不正是从冬到夏变化的反面,此种非对称性可由加熱过程和减熱过程的不可逆性解釋。在北半球从冬到夏对大气來说是加熱的,而从夏到冬大气失去熱量,因为加熟过程和減熱过程都不是可逆的,故从夏到冬的变化也不与从冬到夏的变化对称。 3.东風帶向西風帶的角動量輸送,主要發生於西風环流破坏的時候;主要發生於“引伸槽”和“引伸脊”的經度帶;同時也主要發生於大气的高層。

For four years(1951—54)time determination data,after allowed for personal equation and referred to the mean observatory which is formed by the International Time Office(B.I.H.),seasonal fluctuation with amp- litude equals to 25 ms is found.That is,the clock corrections observed at Zi-Ka-Wei Observatory seem larger in May while smaller in February and July as compered with their annual mean. The Δ(α_α) type error of the fundamental catalogue(FK_3)contributes to the seasonal fluctuation with an amount of...

For four years(1951—54)time determination data,after allowed for personal equation and referred to the mean observatory which is formed by the International Time Office(B.I.H.),seasonal fluctuation with amp- litude equals to 25 ms is found.That is,the clock corrections observed at Zi-Ka-Wei Observatory seem larger in May while smaller in February and July as compered with their annual mean. The Δ(α_α) type error of the fundamental catalogue(FK_3)contributes to the seasonal fluctuation with an amount of 6ms only. Inclination of atmospheric equi-density surface in pre-earth layer which is calculated with air pressure and temperature data taken from Shanghai and Lig-Yang(180km west of Shanghai)shows annual variation of 2′.5, thus the effect of refraction anomaly corresponding to the inclination calcu- lated is practically null. Besides,room refraction is also harmful.By the air temperature data taken from the east and west wall inside the observing room,the effect of room refraction thus estimated may become 8 ms in summer and turn to zero in winter. However,after draw out the influence of Δ(α_α) type error and room re- fraction,the seasonal fluctuation still appear.It is thought that thermal deformation of the transit instrument may be account for,as the diurnal change of air temperature and the temperature drop at night both signi- ficantly correlate to the seasonal fluctuation of time observation.

中星仪测时的组内符合程度比组外符合程度约高一倍,这已是人所共知的事实.一般认为引起组外符合程度较差的因素是仪器情况的变更和反常折射的存在.本文根据1951—1954年间徐台的天文测时结果求出它的季节性变化,并考虑星表误差、反常折射以及其他气象因素在测时结果所引起的影响.在上述期间,徐台天文测时所用的是一具口径80mm 焦距86cm 的帕兰(Prin)中星仪,附有马达带动人手操纵的接触测微器,仪器的水平轴是用水银盘控制的.主要的观测者为龚惠人(K),沈祖耀(S),罗定江(L)三人.

Based on more than 30 surface stations situated at a height near 3000 m and more 10 resonde stations the pressure systems over the mountaneous region of Western Kansu are analyzed. Five meso-pressure systems, two highs and three lows, are found on the mean chart. The annual variations of their intensity and positions are discussed. Two case-studies are made of these meso-systems. Finally the relationship between the temperature field and these meso-systems is discussed.

通过祁連山及其邻近地区高度在3000米左右的三十多个地面观測站和附近十多个探空站气压的分析,发現在山区平均气压图上存在着五个中型气压系統:即疏勒河高压、山区东段高压、黑河低压、柴达木低压及(黄河)河曲低压。討論了它們的强度范围和位置的年变化;并由冬季山区各要素的分布状况,推測出存在于山区的平均垂直环圈与气压系統是相对应的;分析了两个中型系統影响雨量分布的实例。最后,討論了这些系統与溫度場的关系。

 
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