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降水     
相关语句
  precipitation
    Pollution Characteristic of Acid Precipitation in Zhejiang and Its Multi-dimension Analysis
    浙江降水污染的特征和多维分析
短句来源
    preliminary Study on Acidity and Composition of Precipitation over Zhoushan
    舟山降水酸度及其组成研究
短句来源
    On the distributional characteristics of acidity of precipitation in Shanghai Region and the relationship between the acidity of precipitation and meteorological conditions
    上海地区降水pH值的分布特征及其与气象条件的关系
短句来源
    Predicting Model of Acid Rain pH Value in :Atmospheric Precipitation with Grey System Theory GM(1, 1)
    用灰色系统理论GM(1,1)建立大气降水中酸雨pH值的预测模型
短句来源
    DIRECT DETERMINATION OF CALCIUM IN PRECIPITATION BY ATOMIC ABSORPTION OF FLAME
    火焰原子吸收法直接测定降水中钙
短句来源
更多       
  rainfall
    Application of GPSM(1) Grey Model in Forecasting Atmospheric Rainfall Ac
    GPSM(1)灰色模型在大气降水酸度预测中的应用
短句来源
    CHANGES OF SO_4~2- CONCENTRATION IN RAINFALL IN RURAL AREA OF HUBEI PROVINCE
    湖北农村降水中SO_4~(2-)浓度变化研究
短句来源
    COMPREHENSIVE ANALYSIS ON INFLUENTIAL FACTORS OF AIR RAINFALL ACIDITY IN BAO TOU
    综合分析包头市大气降水酸度的影响因素
短句来源
    Study on Distribution of pH Value of Rainfall in the Atmosphere and Causes of Acid Rain Formation in Mianyang City
    绵阳市大气降水pH值时空分布及酸雨成因研究
短句来源
    Determination of k~+、Na~+、Ca~(2+) and Mg~(2+) in rainfall by FAAS
    FAAS法测定大气降水中的k~+、Na~+、Ca~(2+)和Mg~(2+)
短句来源
更多       
  rain
    Predicting Model of Acid Rain pH Value in :Atmospheric Precipitation with Grey System Theory GM(1, 1)
    用灰色系统理论GM(1,1)建立大气降水中酸雨pH值的预测模型
短句来源
    QUALITY CONTROL AND QUALITY GUARANTEE OF RAIN RESEARCH IN CHONGQING AREA
    重庆降水研究的质量控制和质量保证
短句来源
    STUDY OF THE RELATIONSHIP BETWEEN ACID RAIN AND ATMOSPHERIC PARTICLE IN CHONGQING
    重庆大气颗粒物与酸性降水关系研究
短句来源
    Research on precipitation background value and definition of acid rain
    降水背景值与酸雨定义研究
短句来源
    Determination of Trace Hydrogen Peroxide in Rain Water with Spectrophotometric Method
    分光光度法测定降水中微量过氧化氢
短句来源
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  wet precipitation
    Chemical characteristics of wet precipitation in Beijing
    北京大气湿沉降(降水)化学特征
    The wet precipitation chemistry and the temporal and spatial characteristics of pH value of rainwater in Hunan province were discussed.
    对湖南省城市大气湿沉降化学及降水pH值的时空特征分布规律进行了论述和研究;
短句来源
    In the paper,some case studies and statistical studies are performed on the relationship between the distribution of pH values of wet precipitation in Shanghai and horizonal air transport in the surface layer. The distribution of pH values of wet precipitation in Shanghai is closely related to the surface wind velocity, the prevailing wind direction,the maximum mixed depth (MMD) and the ventilation coefficient.
    对上海地区降水pH值与地面风向、混合层平均风向、地面风速以及通风系数进行实例分析和统计表明:在离市区较远的地区,酸雨的出现与混合层平均风向的变化有关,而与地面风向的变化关系不大;
短句来源
    In the city areas, whether or not the pH value of wet precipitation is less than 5.6 depends on the prevailing wind direction. In the leeward of the city, the pH value of wet precipitation decreases with the increase of the surface wind velocity and the ventilation coefficient.
    在市区下风方向,随着地面风速或通风系数的增大,降水pH值逐渐降低,当通风系数增加到一定量级后,下风方向才显著地出现酸雨。
短句来源

 

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      precipitation
    The water-soluble glucan was obtained from Pleurotus florida fruit bodies by hot water extraction, ethanol precipitation, DEAE cellulose dialysis and Sephadex G-75 gel filtration.
          
    Preparation and characterization of nanocrystalline ZnO by direct precipitation method
          
    Nanocrystalline ZnO was prepared with ZnCl2·2H2O and (NH4)2CO3 as raw materials by direct precipitation method.
          
    The ion-exchanger LiAlTiO4 of spinel type was prepared by the common precipitation/hydrothermal crystallization method, and was acid-modified.
          
    The precursors of Fe2O3-SiO2 mixed oxides prepared through co-precipitation method were modified by microwave hydrothermal treatment for the first time.
          
    更多          
      rainfall
    The two sites have similar altitudes, soil types, annual mean rainfall and seasonality of dry and wet.
          
    At the same time, better correlative relationship between runoff and sediment production and rainfall and rainfall intensity were testified by multiple regression, but the correlation decreased gradually with the increase of canopy density of forest.
          
    When the soil is covered only by litter, both the maximal rainfall amount and intensity in different forest stands are different if there is no water infiltration and runoff from the ground surface.
          
    The river runoff had a close correlation with annual rainfall, the size of forest harvesting and regeneration.
          
    The reduction of peak flow rates was significant when rainfall peak was higher than 0.8 mm/min, especially for short-term rainfall events.
          
    更多          
      rain
    Compared with other forest types, cycling rate of N in the community was lower than in deciduous broad-leaved forests, rain forests, and mangroves, and was moderate in evergreen broad-leaved forests.
          
    In order to explain the spatial patterns of interception, we adopted grid-sampling method to install rain-gauges to measure throughfall.
          
    Results show that the coefficient of variation (Cv) of throughfall tends to decline as rain intensity increases.
          
    There are four types of rainfall in the Three Gorges area, namely gradually dropping rain, even rain, sudden rain and peak rain.
          
    It was determined that with different rainfall types, preferential flow appeared at different times, occurring first in peak rain, followed by sudden rain, gradually dropping rain, and then even rain.
          
    更多          
      wet precipitation
    Chemical composition of S?o paulo atmospheric wet precipitation
          
    Chemical composition of wet precipitation at a developing urban site in southeastern China
          
    The latter is of importance for the removal of the soot from the atmosphere since the conversion of the soot surface from originally hydrophobic into hydrophilic behaviour should ease wet precipitation.
          
    Analysis proved to be difficult due to the low amounts of aerosols collected and the low concentrations of components in cloud water and wet precipitation.
          
    Net primary productivity and nutrient cycling across a mesic to wet precipitation gradient in Hawaiian montane forest
          
    更多          


    The membrane filters sampled at a height of 60 m and at ground level were processed with a drop freezing technique and the static vapor-diffusion chamber,Comparisons of IN concentrations obtained by the two techniques were made,The blank filter counts and ice nucleus measurement reproducibi lity were analysed,The factors affecting IN concentration measurements are discussed and some favorable operation conditions suggested,It was found that:a,the IN concentrations typically range from 0.2 1~(-1) to 2.0 1~(-1)...

    The membrane filters sampled at a height of 60 m and at ground level were processed with a drop freezing technique and the static vapor-diffusion chamber,Comparisons of IN concentrations obtained by the two techniques were made,The blank filter counts and ice nucleus measurement reproducibi lity were analysed,The factors affecting IN concentration measurements are discussed and some favorable operation conditions suggested,It was found that:a,the IN concentrations typically range from 0.2 1~(-1) to 2.0 1~(-1) at -20℃,b,significant time variations in IN concentrations occurred,c,the IN concentrations obtained by the drop-freezing technique typically exceeded the diffusion chamber values,d,the two variatin trends were generally in phase,e,high IN concentrations often were associated with precipitation events.

    在70米高度和地面分别用憎水型滤膜收集大气冰晶核。取样体织为100升。同时用水滴冻结法和温度梯度扩散云室处理滤膜。分析本底浓度值和重复率。考虑滤膜污染、结霜、延迟处理和涂油等的影响。比较两种方法测定的浓度大小。在-20℃时典型的冰晶核浓度的变化范围为0.2-2.0升~(-1),浓度随时间而变化。水滴冻结法测定的浓度一般大于扩散云室法。二者的时间变化趋势通常为一致。高浓度的出现往往与降水有关。

    For crop yield, climate is one of the most important environmental factors, of which solar radiaton, temperature, and precipitation are the fundamental ones. In this paper, the auther has attempted to examine the combined effects and try to derive the method of computation. The caculation equatin of potential productivity by temperature and sunshine is given as following. G_y=Q_g(1-a)P_t(1-R)(γβσ)/c Where G_y is the potential productivity by temperature and sunshine; P_t is the relative rate of photosynthesi...

    For crop yield, climate is one of the most important environmental factors, of which solar radiaton, temperature, and precipitation are the fundamental ones. In this paper, the auther has attempted to examine the combined effects and try to derive the method of computation. The caculation equatin of potential productivity by temperature and sunshine is given as following. G_y=Q_g(1-a)P_t(1-R)(γβσ)/c Where G_y is the potential productivity by temperature and sunshine; P_t is the relative rate of photosynthesi s, which equals the ratio of the photosynthesis rate at temperature t to the same rate, the most suitable temperature, Q_g is the physiological radiation, γ is the plant intercepting rate against photo-energy, σ is conversion efficiency of quantum, c is the mean capability of heat production of dry matter, β is the coefficient of economical yield.

    本文试图把太阳辐射,温度和降水等基本要素统一起来对农作物潜在产量进行分析,阐明气候生产潜力在黄土高原的地理分布特征。太阳辐射及温度的生产潜力用下式计算: G_y=Q_g(1-α)P_t(1-R)(γβσ)/C水分条件对产量的影响用干燥度表示,当干燥度小于1时,产量不受水分限制;当干燥度大于1时,其量随干燥度增加而线性减少(正文表1)。根据生产潜力的大小,笔者对农业与牧业的界线进行了讨论,这比习惯上用降水量确定其界线的依据更充分。

    The concentration of fluoride and iodide in the zonal natural soil as well as the distribution of them in soil section were studied. The concentration range of total fluoride in zonal natural soil in China is from 109 to 46lppm, geometric average being 281ppm, and lower than that in the cultivated soil (379ppm). The concentration range of total iodide in zonal natural soil is between 0.97 and 18.49ppm, geometric average being 2.79ppm. The main source of fluoride in natural soil is original clay-forming material...

    The concentration of fluoride and iodide in the zonal natural soil as well as the distribution of them in soil section were studied. The concentration range of total fluoride in zonal natural soil in China is from 109 to 46lppm, geometric average being 281ppm, and lower than that in the cultivated soil (379ppm). The concentration range of total iodide in zonal natural soil is between 0.97 and 18.49ppm, geometric average being 2.79ppm. The main source of fluoride in natural soil is original clay-forming material and rock-forming soil. Iodide in natural soil is mainly from precipitation, but the original clay-forming material supplements some iodide to soil too

    本文研究了我国12种地带性自然土壤中氟和碘的含量情况及其在土壤剖面中的分布状况.研究表明,自然土壤总氟的含量范围为109—451ppm,几何平均值为281ppm,低于耕作土的几何平均值(379ppm).总碘含量范围为0.97—18.49ppm,几何平均值为2.79ppm.自然土壤中的氟主要来自成土母质和母岩,碘主要来自大气降水.成土母质亦有一定的补给作用.

     
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