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自然蒸发     
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  natural evaporation
     By way of analysis of Na + ,K + ,Mg 2+ //Cl - ,SO 42- -- - H 2 O quinary system and the experiments,the laws of crystallization in the step of natural evaporation in the process to produce Li 2 CO 3 from the salt lake brine is studied.
     以Na+,K+,Mg2+//Cl-,SO42-———H2O五元交互体系相图分析和试验,对青海某盐湖卤水提锂过程的自然蒸发阶段的蒸发析盐规律进行研究。
短句来源
     Study on the Natural Evaporation of Low Grade Brines from Chaerhan Salt Lake
     察尔汗盐湖低品位卤水自然蒸发试验研究
短句来源
     For the most efficient separation,the recommended density of heavy-liquid is 2.80-2.81 g/mL; Natural evaporation method is good for recycling heavy-liquid with only 5mL heavy-liquid wasted from the 50 g sample.
     建议将重液的密度配制为2.80~2.81g/mL,这样可有效地分离出牙形石,采用自然蒸发法回收重液,处理50g样品仅损耗5mL的重液;
短句来源
     Natural evaporation of low grade brine in Balunmahai Salt Lake
     巴仑马海盐湖低品位卤水自然蒸发试验研究
短句来源
     The natural evaporation is adopted to modify the system of sedimentation.
     采用自然蒸发法对除尘废水沉淀处理系统进行了局部地改进。
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  “自然蒸发”译为未确定词的双语例句
     The surface of soil was covered with plastic film lost water 5.20g by nature evaporation during one night (from 20:00 pm to following 5:00 am), the surface of soil was covered with 2 cm rough sand lost water 6.60g by nature evaporation during one night.
     塑膜覆盖的试验土壤表面一夜间(20:00至次日凌晨5:00)的自然蒸发失水量为5.20g,2cm厚粗砂粒覆盖的为6.60g;
短句来源
     The permeability coefficient of soil is about 1.0~1.1 m/d in the place which is scheduled for building natural evaperation pool.
     在预定设置废水自然蒸发池地段土壤的渗透系数较大 ,约为1.0~ 1.1m / d;
短句来源
     Regardless of preventing evaporation or not, soil water suction decreased firstly and then increased with the increase of soil depth, and soil water suction at the same depth increased with time.
     无论在隔绝蒸发还是在自然蒸发条件下,短期内土壤水吸力有随土层深度的增加呈先下降后升高的趋势,而同一深度土层水吸力则随时间的推移而升高;
短句来源
     This paper proposes numerical analysis of expansive soil slope taken into account of infiltration,evaporation and fissure of soil.
     用SEEP/W和SLOPE/W软件对膨胀土渠坡工作期间水位快速升降、降雨入渗以及自然蒸发等可能工况进行了系统分析,并考虑了裂隙的影响。
短句来源
     A simplified mathematical model of two-dimensional axisymmetrical flow driven by surface tension gradient due to heat transfer within a volatile liquid droplet which is evaporating on a horizontal plate is presented.
     提出了水平平板上自然蒸发的挥发性液体液滴,在传热产生的表面张力梯度作用下 液滴内部二维轴对称流动的简化数学模型。
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  相似匹配句对
     MATHEMATICAL MODEL OF THE EVAPORATING SYSTEM WITH NATURAL CIRCULATION
     自然循环蒸发系统的数学模型
短句来源
     A Model for Analysing the Operating Characteristics of a Natural Circulation Boiling System
     自然循环蒸发系统运行特性分析模型
短句来源
     On Natural Appreciation of the Beautiful
     自然审美
短句来源
     The Natural Meaning
     自然的心迹
短句来源
     The optimization of evaporation process
     蒸发工艺的优化
短句来源
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  natural evaporation
Acetone solution-casting films of poly(methylmethacrylate) were analyzed by differential scanning calorimetry and pyrolysis gas chromatography-mass spectroscopy under natural evaporation and ultrasonic vibration, respectively.
      
The result of the experiment shows that when the acoustic wave enters into the surface soil the water content here increases on the background of decreasing due to natural evaporation.
      
Groundwater rise in sabkha was attributed to numerous reasons; the interruption of the natural evaporation by construction is considered to the most prominent.
      
Penman (Natural evaporation from open water, bare soil and grass,Proc.
      
Another consequence is that the changes to ground-level surfaces reduce the amount of natural evaporation, which creates a drier environment.
      
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  physical evaporation
Large-scale synthesis of amorphous silica nanowires was achieved by using simple physical evaporation of a mixture of Si and Al2O3 powders.
      
Super-arid deserts, however, have an extremely scarce vegetative cover (low, if any), physical evaporation, a thin zone of evaporation influence, and slow water outflow.
      
On the other hand, films prepared via physical evaporation in vacuum were found to exhibit higher sensitivity to CO.
      
  spontaneous evaporation
Well developed crystals may be obtained by the spontaneous evaporation at room temperature of relatively large volumes of saturated solutions of sparely soluble compounds.
      
Crystallization of saturated water-alcohol solutions by spontaneous evaporation.
      
Spontaneous evaporation of dilute saturated solutions.
      
Large, perfect crystals of urea nitrate were obtained by the addition of concentrated nitric acid to an aqueous solution of the salt, followed by spontaneous evaporation.
      
Microcrystallization by spontaneous evaporation of dilute saturated solutions of difficultly soluble substances.
      
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1. The deuterium contents of two,bittern samples obtained from Chiaochou Bay in Tsingtao Locality and Kwangchou Bay in Chenkiang Locality were determined by float method. Sp. gr. of Shantung sample is 1.240 (28.0?Be') and that of Kwangtung sample is 1.260 (29.7° Be′). A sample:from Yellow Sea was chosen .as a standard for comparison.All determinations were carried out after normalization of O18 in the sample, by means of CO2-NaHCO3 equilibrium method. In. experiments employing a stream-lined spindle-shaped float...

1. The deuterium contents of two,bittern samples obtained from Chiaochou Bay in Tsingtao Locality and Kwangchou Bay in Chenkiang Locality were determined by float method. Sp. gr. of Shantung sample is 1.240 (28.0?Be') and that of Kwangtung sample is 1.260 (29.7° Be′). A sample:from Yellow Sea was chosen .as a standard for comparison.All determinations were carried out after normalization of O18 in the sample, by means of CO2-NaHCO3 equilibrium method. In. experiments employing a stream-lined spindle-shaped float and setting the observation region of floating in the middle portion of liquid. column, therefore, a larger range of linear relation between temperature and velocity (rising or falling) of float is obtained, that is, temperature range is±0.33℃ and the velocity range is ±0.26 mm/sec.2.Determined results show that the density of Shantung bittern sample (28°Be′) is 4.208 r higher than that of standard sea water sample, that is, the D content of Shantung bittern is 0.0037 mole % D2O higher than that of the standard (Corresponding to 24.03% of D content of standard sea water sample), the density of K,wangtung bittern sample (29.7°Be′) is 6.250 r higher than that of the standard, that is, the D content of Kwangtung bittern is 0.0058 mole % D2O higher than that of the standard (Corresponding to 37.66% of D content of standard sea water sample). The max. experimental error is ±0.6 7.3.Comparing the determined results of these two samples from Shantung and Kwangtung we can see that the Kwangtung sample is more abundant in heavy water content (through °Be′ of two samples are not entirely the same, the density difference is still apparent). This agrees with the expected results caused by the evaporation difference which is due to the latitudinal difference between the two localities (Chenkiang situated at 21° north latitude and Tsingtao at 36° north latitude).4.The density difference between sample water and standard water shows that after solar evaporation of sea water and salting out of sodium chloride the D content in bittern is concentrated as expected. Thus, highly concentrated bittern may be used as raw material for production of heavy water--a valuable information for the comprehensive utilization of sea water and bittern.

1.我们用浮沉子法测定了胶州湾青岛地区及广州湾湛江地区盐田析盐后苦卤中重水的含量,山东苦卤此重为1.240相当于28.0°Bé,广东苦卤比重为1.260相当于29.7°Bé,并用黄海某区海水作为标准进行此较。所有测定都在用CO_2-NaHCO_3平衡法使氧同位素正常化以后进行的。实验中采用了流 线型梭把式浮沉子,并使浮沉子升降区观察范围设在液柱中部,获得了较大的浮沉子升降速度与温度间直线性关系的范围。温度范围±0.33°C。速度范围±0.26毫米/秒。 2.测定结果表明:山东苦卤(28°Bé)密度较标准海水高出4.208γ相当于0.0037克分子%D_2O,重水含量较标准海水高24.03%。广东苦卤(29.7°Bé)密度较标准海水高出6.250γ,相当于0.0058克分子%D_2O,重水含量较标准海水高37.66%。 3.比较广东与山东二份样品测定结果,可以看出广东苦卤中重水含量有更多富集(虽然二者°Bé不尽相同,但密度差仍旧是显著的)。这与湛江、青岛两地的纬度差异(湛江——北纬21°,青岛——北纬36°)而引起的蒸发差异所应导致的预期结果是一致的。 4.样品水与标准水的密度差证明海水经自然蒸发析...

1.我们用浮沉子法测定了胶州湾青岛地区及广州湾湛江地区盐田析盐后苦卤中重水的含量,山东苦卤此重为1.240相当于28.0°Bé,广东苦卤比重为1.260相当于29.7°Bé,并用黄海某区海水作为标准进行此较。所有测定都在用CO_2-NaHCO_3平衡法使氧同位素正常化以后进行的。实验中采用了流 线型梭把式浮沉子,并使浮沉子升降区观察范围设在液柱中部,获得了较大的浮沉子升降速度与温度间直线性关系的范围。温度范围±0.33°C。速度范围±0.26毫米/秒。 2.测定结果表明:山东苦卤(28°Bé)密度较标准海水高出4.208γ相当于0.0037克分子%D_2O,重水含量较标准海水高24.03%。广东苦卤(29.7°Bé)密度较标准海水高出6.250γ,相当于0.0058克分子%D_2O,重水含量较标准海水高37.66%。 3.比较广东与山东二份样品测定结果,可以看出广东苦卤中重水含量有更多富集(虽然二者°Bé不尽相同,但密度差仍旧是显著的)。这与湛江、青岛两地的纬度差异(湛江——北纬21°,青岛——北纬36°)而引起的蒸发差异所应导致的预期结果是一致的。 4.样品水与标准水的密度差证明海水经自然蒸发析出氯化钠以后,重水含量获得了预期的富集效果。高浓度的苦卤可以作为提取浓重水的原料,为海水卤水综合利用提供了有价值的资料。 本文在实验过程中曾?

Using Penman's Formula, we computed the natural evaporation Er of Ningxia districts, and studeid its distribution. The ratio Er/r (aridity index) is used as index for agroclimatological division. The formula Er= KtE0 is used to compute E0 for spring, summer and autumn. The proportion coefficient (jt= fc/E0) between E0 andfield evaporation fc is used as a moisture index for major growth periods of wheat, paddy rice and millet. Based on these information, irrigation requirements are studied.

本文利用潘曼(Penman)公式E_0=(ΔH+rE_a)/(Δ+r),计算了宁夏各地自然蒸发量E_r值,分析了E_r的时空分布特征;以E_r/r的比值(干燥指数)作为划分宁夏农业气候区域的指标,并根据E_r=L_iE_0的关系式,订正了宁夏地区春、夏、秋各季的转换系数K_i值;以计算出的农作物各生育期内自由水面蒸发量E_0值和实测田间蒸发量′fc的比例系数(′fc/E_0),作为土壤-植物-近地表层这个系统的水份状况的重要指标,鉴定出了宁夏灌区小麦、水稻、小糜子等主要作物生育期的蒸发系数j_t值和耗水量。用水分平衡方程式,求出了作物灌溉量和生育末期土壤水分储水量,为研究宁夏农业气候区划及建立农作物水分平衡预报,提供了依据。

A simplified mathematical model of two-dimensional axisymmetrical flow driven by surface tension gradient due to heat transfer within a volatile liquid droplet which is evaporating on a horizontal plate is presented. Parameters on which the flow in the droplet depend mainly are Biot number and Marangoni number. The flow fields and temperature profiles within the droplet are evaluated numerically with vorticity-stream function method. The results show that as the Bi and Ma increase gradually, the flow in the...

A simplified mathematical model of two-dimensional axisymmetrical flow driven by surface tension gradient due to heat transfer within a volatile liquid droplet which is evaporating on a horizontal plate is presented. Parameters on which the flow in the droplet depend mainly are Biot number and Marangoni number. The flow fields and temperature profiles within the droplet are evaluated numerically with vorticity-stream function method. The results show that as the Bi and Ma increase gradually, the flow in the droplet will turn from round flow in same direction into several roll-cell flows. The conditions and mechanisms causing roll cell flows in the droplet and the characteristics of roll cell flow are analysed in detail.

提出了水平平板上自然蒸发的挥发性液体液滴,在传热产生的表面张力梯度作用下 液滴内部二维轴对称流动的简化数学模型。导出了控制液滴内部流动的参数是比渥数Bi 和马拉哥尼数Ma。并用涡量-流函数数值计算方法求解了液滴内部流动的流场和温 度分布。发现随着Bi数和Ma数的不断增大,液滴内部流动将由一致方向的回转流 动分化为多个细胞流结构,本文还对产生细胞流结构的机理、条件和特点作了详尽分 析。

 
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