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funnel method
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  漏斗法
     (3) Obtaining the pure nematodes from plant sample by using the small sample sieve combining funnel method.
     (3)小的分样筛与漏斗法结合从植物样品获得纯净的线虫.
短句来源
     Sterilization was easy and the purification efficiency was low in the G 3 funnel method. Purified E.
     G3漏斗法易无菌操作,方法简便,但提纯效果不理想,回收率为25%,有少量杂质。
短句来源
     In order to try to find out the ecological law of the soil animals under pesticide pollution, the writer makes a study of ecological quantitative in group compose, number distribution, seasonal variation, diversity, similarity and so on, adopting Tullgren dried funnel method during 1, 2003 and 12, 2003. Furthermore, the author specially studied on oribatid mites in above mentioned aspect.
     为了探讨农药对土壤动物的影响,为农药污染的环境监测提供参考依据,笔者于2003年1月至2003年12月期间,采用Tullgren干漏斗法,喷洒辛硫磷农药、氯氰菊酯农药,对未污染土壤进行了长达一年的室内模拟农药污染实验。
短句来源
     Baermann funnel method showed higher extraction efficiency than shallow dish method,and the difference was reflected in the numbers of bacterial-feeding nematodes and the nematodes with body size between 40 μm and 32 μm (400~500 mesh).
     贝尔曼漏斗法的分离效率高于浅盘法 ,主要反映在食细菌线虫和虫体在 4 0~ 32 μm(4 0 0~ 5 0 0 )的线虫数。
短句来源
     Inspection of nematode isolation for bonsai medium is an important work in export bonsai quarantine, this experiment basic on the improve float centrifuge method(Guo Quan et al, 1995), use the Soak float centrifuge method to isolate nematodes inside the medium, compare nematode recovery amount between soak time of this method and Funnel method or Pans method.
     介质盆景线虫的分离检验是出口盆景检疫的一项重要工作 ,试验以改进浮力离心法〔1〕为基础 ,采用浸泡浮力离心法对介质线虫进行分离检验 ,比较此法各种浸泡时间、漏斗法、浅盆法检验线虫的回收量 .
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  “funnel method”译为未确定词的双语例句
     Metallic powders-Determination of apparent density-Part 1: Funnel method
     中华人民共和国国家标准 金属粉末松装密度的测定——第一部分 漏斗法
短句来源
     A NEW TECHNIQUE——SUPPORTING FUNNEL METHOD USED IN RECOVERING AND CONTROLLING OF LARGE-SCALE COLLAPSED MAIN TRANSPORTATION SHAFT
     一种治理主溜井特大塌方的新方法——托斗法
短句来源
     adopting Tullgren dried funnel method during 10,200 land 9,2002.In Heze Peony Garden,Acari and Collembola are dominant groups,the former accounting for 67.96% of total individuals and the latter 13.18%.
     通过对菏泽牡丹园土壤动物的调查研究发现,蜱螨(螨类)亚纲,是菏泽牡丹园土壤动物的主要优势类群,占土壤动物总数量的67.96%,另一优势类群——弹尾(跳虫)目占13.18%。
短句来源
     The capacity of soil wreath knife is 100 cm 2. We collect 72 samples each month, then we use the hand selecting method and the Tullgren funnel method to collect the soil animals.
     取土环刀的容积为100 cm~2。 每月共采样72个。
短句来源
     The capacity of soil wreath knife is 100cm3. We collected 36 samples each month,and then separated and gathered the soil animals both in the land selecting method and theTullgren funnel method .
     土壤环刀的容积为100cm3。 每月共采样36个。
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  相似匹配句对
     Method:
     方法
短句来源
     Method;
     方法:对110例病人进行腹腔镜手术。
短句来源
     ANALYSIS OF BLASTING FUNNEL TEST BY VCR METHOD
     VCR法爆破漏斗试验浅析
短句来源
     A FINITE STRIP METHOD IN ANALYSIS OF CYLINDER AND CONICAL FUNNEL
     圆筒结构及圆锥形漏斗分析的有限条法
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  funnel method
The Baermann funnel method was adopted for collecting tardigrades, and DIC microscopy was used for specific identification.
      
At the Laboratory of Mycology and Potato Research at Wageningen these cases are being studied by the improved funnel method of IrSeinhorst (who will publish it before long).
      
Containers were removed daily for 10 consequent days and surviving juveniles were recovered from the soil by Baermann funnel method, then the remainder of soil was subjected toSpodoptera littoralis-baiting technique.
      
These are respectively the dynamic drop volume method, the dynamic capillary method, and the (reversed) funnel method.
      
Each site was sampled three times (May, August and October) in 1999, animals were extracted using the "wet funnel" method, counted and identified.
      
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This is the seventh report of our investigation on the theory of countercurrent extraction. The previous reports have been widely used in the process development of rare earth extraction industries in China with satisfactory results.In the present investigation a program was written to simulate the so-called "funnel method" of laboratory practice of three-component countercurrent extraction from starting to practically reaching the steady state. The program is applicable for three-component system using...

This is the seventh report of our investigation on the theory of countercurrent extraction. The previous reports have been widely used in the process development of rare earth extraction industries in China with satisfactory results.In the present investigation a program was written to simulate the so-called "funnel method" of laboratory practice of three-component countercurrent extraction from starting to practically reaching the steady state. The program is applicable for three-component system using saponified acid extractants such as D2EHPA, DBP, HEH(EHP), OPPA, versatic acid, naphthenic acid etc. The results obtained may be summarized as follows: 1. Curves showing the variation of the purities of both products with the ratio of the number of transfers to the number of total stages (G) were obtained for several typical three-component systems. 2. The number of transfers in a batch system or the time from starting a continuous countercurrent extraction to practically reaching the steady state may be calculated by this program. 3. The stage-wise composition of each component in both the aqueous and the organic phases at any time from starting the countercurrent extraction can be typed out by this program. 4. The program may provide much more information than the laboratory "funnel method" does in a very short time, while the "funnel method" requires several months to accomplish the work.An illustrative example: A mixture of rare earths containing 69.06 mol% component C, 3.32 mol% component B and 27.62 mol% component A is separated by a saponified acidic phosphorus extractant, in which the separation factors are β_(A/B)=1.5 and β_(B/C)=2.4. The purities of the raffinate and the extract required are respectively: P_(BC1)=0.99 and (?)_(An+m)=0.999. This means that the separation is made between A/BC. The calculated countercurrent extraction parameters are as follows: (?)=3.4615, W=3.1899, n=10, m=18.Fig. 1 shows the variation of the purities of both products and the variation of average accumulation of A, B, C as a function of G. The average accumulations TMA, TMB and TMC are defined respectively as follows: TMA=(?)(A_i+(?))/ (n+m), TMB=(?)(B_i+(?))/(n+m) and TMC=(?)(C_i+(?))/(n+m).From Fig. 1 it may be seen that when G is smaller than 30, the purity of the raffinatep (?)_(BC1) is very high, while that of the extract (?)_(An+m) is quite low, so that TMA gradually increases and TMC gradually decreases. Then (?)_(An+m) gradually increases with TMA and (?)_(BC1) gradually decreases with TMC. The intermediate component B gradually increases and then decreases, having a maximum value of TMB at G equal to about 50.The stage-wise distribution of each component in both the aqueous and the organic phase at G=600 is shown in Fig.2 in which it may be seen that the molefraction of the intermediate component in both the aqueous and the organic phases (?)_(B1) and (?)_(B1) have maximum points in the extraction section near the feed stage.

推导了三组份恒定混合萃取比体系的萃取平衡方程式;并以两组分体系的动态平衡研究方法为基础,建立了三组份体系动态平衡的数学模型和计算程序;应用计算机对不同进料方式和工艺参数的串级萃取体系进行了计算,详细研究了三组份体系在动态过程中的基本规律,计算程序模拟了“分液漏斗法”串级实验操作,其具有“理想实验”的特性,为三组份体系的串级优化工艺参数的设计和合理的验证提供了一个可靠而简便的方法。

For a system with wide difference in molfractions of the components to be separated and low separation factor, but requiring both products in high purity, it usually takes quite a long time (eq. several months) to reach the steady state, before which one cannot get both products in the required purity. Therefore it is interesting to devise a method for shortening the time required to reach the steady state and to avoid unqualified products. In the present investigation, we have studied this problem by a computer...

For a system with wide difference in molfractions of the components to be separated and low separation factor, but requiring both products in high purity, it usually takes quite a long time (eq. several months) to reach the steady state, before which one cannot get both products in the required purity. Therefore it is interesting to devise a method for shortening the time required to reach the steady state and to avoid unqualified products. In the present investigation, we have studied this problem by a computer simulation of the so-called "funnel method" of starting a cascade of two component system. By analyzing one of the examples in detail, we have obtained the following results:1. The "Reflux method" for starting a cascade can be used in principle for any extraction system. It is particularly advantageous for separation of individual light and mid-rare earths by acidic organophosphorus extractants such as D2EHPA, where the separation factors between the neighboring rare earths are small and the purities of the products required are high. The results of an example show that the time required to reach the steady state may be shortened as much as 60 times as compared to the "normal" method for starting the cascade. Moreover, the unqualified outputs produced before reaching the steady state can be re- duced to minimum. These two effects will reduce the cost of separation considerably and increase the economic efficiency of the extraction industry.2. As shown in equations (1)~(4) and Table 2, maximum separation efficiency between stages is achieved under the "total reflux" conditions, the time required to reach the steady state is very short, but the ratio of two components cannot be altered by "total reflux" operation.3. If the molfraction f_B of the less extractable component B is much greater than the molfraction f_A of the more extractatble component A, then the raffinate will first reach the required purity of B after: starting the cascade with "total reflux", then we add feed solution and allow the pure B product to go out as in normal operation but reflux A at the extract end. This process of refluxing at one end will accelerate the accumulation of less abundant component A in the cascade. For example, as shown in Table (2) and Fig. 3, this process of refluxing at one end soon increases the percentage of A in the whole cascade from 8% to 48%, at which the purity of A in the organic extract outlet reaches the required value, and the cascade can be adjusted to the normal operation.4. Before turning to the normal operational condition, it is appropriate to insert a stage of operation with larger reflux ratio, i.e. with larger J_s and J_w values than the normal condition.5. Using the computer program of this paper, we can save much computer time than the method given in reference [3] in order to verify the optimized design of countercurrent extraction parameters.The above method has also extended to three and four component systems and verified by practical applications in some rare earth factory with satisfactory results. The details of this extension will be reported in the next communication.

本文提出了恒定混合萃取比体系串级萃取分离的回流启动模式。对全回流和单回流启动方式的动态过程作了定量的模拟计算。对分离系数小、产品纯度要求高、原料中组成比相差大的串级萃取体系,采用回流启动可以有效地缩短体系达到稳态的时间,并可基本上避免在常规启动中所产生的不合格产品。本理论已在稀土分离工业实践中得到了验证和应用。

In this paper, we present a completely new technological process for separating associated rare-earth minerals with a medium content of yttrium and rich europium. Previously, we have completed countercurrent analogous experinebts in groups with Tb/Dy, Nd/Sm, and Ce/Pr, with a view to creating a new process for extracting each of the rare earth minerals such as Sm_2O_3, Eu_2O_3, Gd_2O_3, Tb_4O_7, Y_2O_3, Nd_2O_3, etc. that are in great demand on the market. In the preparation of the experiments,the parameters...

In this paper, we present a completely new technological process for separating associated rare-earth minerals with a medium content of yttrium and rich europium. Previously, we have completed countercurrent analogous experinebts in groups with Tb/Dy, Nd/Sm, and Ce/Pr, with a view to creating a new process for extracting each of the rare earth minerals such as Sm_2O_3, Eu_2O_3, Gd_2O_3, Tb_4O_7, Y_2O_3, Nd_2O_3, etc. that are in great demand on the market. In the preparation of the experiments,the parameters of each separation section were designed with an IBM-PC computer, using the optimization equations and extreme values formulas from the countercurrent extraction theory. then the optimal parameters thus obtained were input separately into a cromencro computer to do the dynamic equilibrium calculations, strictly simulating the'funnel method' of two-component eountercurrent extraction as practised in laboratories. Finally, we verified those results by analogous experiments. As the calculations proved to accord well with the experimental results, we applied them to the optimal process conditions for extracting the associated rare earths in the roar groups.

本文提出了萃取分离中钇富铕混合稀土的合理工艺流程,完成了Tb/Dy、Nd/Sm、Ce/Pr分组的串级模拟试验,为进一步提取目前市场急需的Sm_2O_3、Eu_2O_3、Gd_2O_3、Tb_4O_7、Y_2O_3、Nd_2O_3等单一稀土创造了有利的条件。各分离段的工艺参数均在IBM—PC计算机上,用串级萃取理论的最优化方程和极值公式进行设计,并将各分离段工艺参数的最优值,在Cromemcro计算机上,完全模拟串级萃取“漏斗法”的操作,进行了动态平衡计算,最后用分液漏斗串级摸拟试验进行了验证。其计算结果与实验结果完全吻合,从而提出了萃取分组的最佳工艺条件。

 
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