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取样研究     
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  sampling studies
     In-Situ Sampling Studies on Olefin-Decrement Reformulation of FCC Naphtha in the Subsidiary Riser
     辅助提升管催化汽油改质在线取样研究
  sampling investigation
     Sampling Investigation of on Situation Early Anchor Corrosion in-situ
     现场早期砂浆锚杆腐蚀现状的取样研究
短句来源
  study on sampling
     Study on Sampling of the Spent Catalyst in Platinum Group Metal Analysis
     废催化剂中铂族金属分析的取样研究
短句来源
  studies on sampling
     Studies on sampling for testing electric conductivity of fruiting plum branches
     测定果梅枝条电导率的取样研究
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      sampling studies
    We present a method for the design and analysis of scan sampling studies involving sub-sampling, based on an actual study of waterfowl activity on a waste stabilisation pond.
          
    Sampling studies on a test against trend in binomial data
          
    In planning spatial sampling studies for the purpose of estimating the semivariogram, the number of data pairs separated by a given distance is sometimes used as a comparative index of the precision which can be expected from a given sampling design.
          
    Levels of paraoxon in excess of 100 ng/m3 were found in orchard air, along with parathion, during the early days of two 21-day sampling studies.
          
    Some empirical sampling studies are reported comparing the standard errors of these statistics.
          
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      sampling investigation
    This paper revealed some problems of the forest sampling investigation from application and pointed out the defects.
          
      study on sampling
    Study on sampling inspection scheme to digital products in GIS
          
    A study on sampling design for optimal prediction of space-time stochastic processes
          
    A study on sampling representativeness of IAEA RM SD-M-2/TM Marine Sediment by INAA
          
    Study on Sampling Method of Rainfall, Throughfall, and Stemflow to Monitor the Effect of Acid Deposition on Forest Ecosystem
          
      studies on sampling
    Studies on sampling schemes for the establishment of corecollection of rice landraces in Yunnan, China
          


    Sampling techniques for Korean pine (Pinus horaiensis) forests mixedwith deciduoud trees in the Lesser Xiaoxingan Mountains were studied.Plotless sampling method (point centered quarter method) is considered tobe a kind of suitable method for this kind of vegetation. The study wasdone by examining four types of forest communities. Results show thatthe minimum points of plotless method are 16 to 18, the distance betweentwo neighborhood points and that between two sampling lines is 15 and 20meters, respectively....

    Sampling techniques for Korean pine (Pinus horaiensis) forests mixedwith deciduoud trees in the Lesser Xiaoxingan Mountains were studied.Plotless sampling method (point centered quarter method) is considered tobe a kind of suitable method for this kind of vegetation. The study wasdone by examining four types of forest communities. Results show thatthe minimum points of plotless method are 16 to 18, the distance betweentwo neighborhood points and that between two sampling lines is 15 and 20meters, respectively. The data from 16-18 points is analogous to that from600m~2 of plot. The minimum area of understoreys is 28-32m~2, whichis 7 or 8 2×2 m quardrats distributed randomly or mechanically.

    本文研究了小兴安岭红松针阔叶混交林的取样技术。通过对三个群落类型的取样研究,认为所应用的无样地方法适用于该植被类型。研究结果指出,应用无样地方法中的中点象限法,其最小点数是16-18个点,点间距为15m,样线间距为20m。16-18个样点的数据,相当于600m~2的样地资料。林下植被的最小面积是28-32m~2,为7-8个2×2(m)随机或均匀分布的样方。

    Investigation on the erosion of Si_3N_4-bonded SiC brick lining of No.6 BF by taking actual samples at Anshan Iron and Steel Complex(AISC) has been made. The results indicate that average erosion rate of the SiC brick lining caused by simultaneous alkali-erosion and cracks is about 10 mm/mon. And the alkali-erosion by potassium takes place mainly in the region of~20 mm from the working surface of the SiC brick lining. The depth eroded by alkali is about 30-50 mm. Further study shows that the alkali-erosion and...

    Investigation on the erosion of Si_3N_4-bonded SiC brick lining of No.6 BF by taking actual samples at Anshan Iron and Steel Complex(AISC) has been made. The results indicate that average erosion rate of the SiC brick lining caused by simultaneous alkali-erosion and cracks is about 10 mm/mon. And the alkali-erosion by potassium takes place mainly in the region of~20 mm from the working surface of the SiC brick lining. The depth eroded by alkali is about 30-50 mm. Further study shows that the alkali-erosion and thermal shock are the main causes of erosion of the SiC brick lining and affected each other. On the basis above mentioned, the direction and technical measures to improve the use of Si_3N_4-bonded SiC bricks on BF are preliminarily discussed.

    本文对鞍钢8号高炉用氮化硅结合的碳化硅砖衬的蚀损进行了现场取样研究,结果表明,碳化硅砖衬同时发生了碱蚀和龟裂现象,其平均月蚀损速度约为10mm,碱蚀来自于钾,主要发生在距砖衬工作面约20mm深的范围内,碱的侵人深度为30~50mm左右。进一步研究表明,碱蚀和热震破坏相互影响,是引起碳化硅砖蚀损的主要因素。据此,初步探讨了用氮化硅结合的碳化硅砖衬在高炉使用的方向和途径。

    Roots play an important role in water and nutrient uptake by crop. The investigation of root system development of winter wheat and the effect of nitrogen, phosphorus and soil moisture on its growth in the North Plain of China was made in 1990 and 1991. Roots were sampled by coring and the changes of root weight and length were determined in five development stages. The root weight growth rates were 0.845, 0.386, 1.921, 2.500 and 0.427g / m2 · day and root length growth rates were 0.062, 0.0329, 0.310, 0.221km...

    Roots play an important role in water and nutrient uptake by crop. The investigation of root system development of winter wheat and the effect of nitrogen, phosphorus and soil moisture on its growth in the North Plain of China was made in 1990 and 1991. Roots were sampled by coring and the changes of root weight and length were determined in five development stages. The root weight growth rates were 0.845, 0.386, 1.921, 2.500 and 0.427g / m2 · day and root length growth rates were 0.062, 0.0329, 0.310, 0.221km / m2 · day in seedling, overwintering, jointing, heading and seed filling stages, respectively. The total root length and total root weight with time could be described by logistic growth function, and the exponential model was suggested for describing root system distribution with soil depth. N and P fertilizer application could promote the growth of winter wheat root system. Water stress reduced the root dry weight and root length, but root length and weight was greater in 0.3-1.20m depth under water stress than that of irrigated wheat. Irrigation could significantly increase roots in the stages of vegetative development and extend the root lifespan in the stages of reproductive development.

    通过田间试验,采用大口径根钻取样研究了华北平原冬小麦根系生长的基本规律及其氮、磷肥和水分对根系生长的影响.结果表明,冬小麦根系生长时间分布规律是冬前较快,越冬不停,拔节至抽穗最快,抽穗后生长减缓并达到最大;根长和根重的增长遵循Logistic模型.空间分布规律是:冬小麦根系随土层深度的分布,无论是根长还是根重都是由上到下逐渐减少,遵循指数递减模型.施用氮肥和磷肥能显著促进冬小麦根系的生长.水分亏缺限制冬小麦根系的生长,但使根系分布下移.灌溉不仅能促进小麦根系前期的生长,而且可以延缓小麦根系后期的衰亡.

     
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