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while using
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  而利用
     while using meta-analysis method to analyse sta-tistics, the result was highly consistent with computer construction model. Thus it wassuggested that meta-analysis method had its validity and reliagility in psychologicalexperimental study and proving theories as well as the reality of a challenge thattraditional statistics method faces.
     而利用元分析的方法进行统计分析,其结果与计算机构造模型有很高的一致性从而提出元分析方法在进入心理学实验研究和证实理论方面的有效性和可靠性,以及传统统计方法面临挑战的事实。
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     While using cybernetics and method, it is rare and immature to research on how to analyze and evaluate network performance, how to direct and standardize network design and management, and how to improve network efficiency and security.
     而利用控制论的理论和方法来分析、评价各种网络系统性能 ,进而指导、规范网络设计和管理、提高网络运行效率和安全性的研究目前国内外还很少 ,也不成熟 ;
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     While using the latter to fill sorts of polygons does not need to maintain sorts of lists and sorting, it doesn't fit for complicated polygons and per pixel fill several times perhaps.
     而利用后者虽然不需要维持各种表和排序,但不适合用于填充复杂图形,并且每一像素可能被访问多次。
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  “while using”译为未确定词的双语例句
     the concentration of PA6 solution was 8%-18% by mass frac- tion and the diameter of the obtained fiber was 50-500 nm while using HFIP as solvent.
     HFIP作为溶剂时PA6可纺丝溶液质量分数为8%~18%,纤维直径为50~500 nm;
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     while using SBR to treat the wastewater, CODcr declined from 540 mg/L to 112 mg/l.
     用SBR法处理废水,CODCr由540mg/L降到112mg/L。
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     The experiment indicates that the method of SnCl2-HgCl2 has the best accuracy and precision,and the next is the way of TiCl3-Na2WO4,while using methyl orange as the reducing indicator has the biggest error.
     实验表明用SnCl2-HgCl2法结果最为准确,TiCl3-Na2WO4法次之,而用甲基橙法结果误差最大。
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     The results showed that the concentration of PA6 solution was 8%-22% by mass fraction and the diameter of the ob- tained fiber was 50-300 nm while using formic acid as solvent;
     结果表明:甲酸作为溶剂时,PA6可纺丝溶液质量分数为8%~22%,所纺出的PA6纤维直径为50~300 nm;
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     While using the rooting medium of l/2MS+IBA0.1mg/L, the rooting rate achieved nearly 100%.
     再生芽在1/2MS+IBA0.1mg/L生根培养基中,生根率达100%。
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     While E.
     利用E.
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     By using of Z.
     利用Z .
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     While H.D.
     D.
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     Using .
     用.
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     while that using traditional method was 10%.
     而用传统的方法造模进行反复多次缺血再灌实验的成功率仅为10%。
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  while using
Two glasses of the same chemical composition manufactured while using two different sources of aluminosilicates: (1) sodium feldspar and (2) volcanic tuffs have been compared [1].
      
The dependences of the NQR signal enhancement on the carrier frequency offset and the time during which the sample was kept in the magnetic field were studied while using the adiabatic demagnetisation technique.
      
The proliferation capability of TCRαβ+ 3Gl l- 6C10- CD4+ CD8- thymocytes was high while using Con A stimulus.
      
This improves the perceptual audio quality upon our previous work of sinusoidal modeling while using the same number of sinusoids.
      
A strange effect was observed while using the method of quasi-simultaneous determination of electrochemical voltage noise and impedance to obtain information on the kinetics of the hydrogen evolution reaction on Ag and Cu microelectrodes.
      
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Estimation of contaminated iron in tungsten-cobalt alloy can be performedwith the aid of paper-descending chromatographic method. After the alloy hasbeeh fused with sodium carbonate in a platinum crucible, tungsten is removedby precipitation. In the filtrate, iron and cobalt are separated by means ofpaper chromatography. Cut out the portion of paper strip which contains onlyiron and extract with 0.1 N bydrochloric acid. Finally iron is determinedcolorimetrically. The amount of iron used in each test is 6.17γ...

Estimation of contaminated iron in tungsten-cobalt alloy can be performedwith the aid of paper-descending chromatographic method. After the alloy hasbeeh fused with sodium carbonate in a platinum crucible, tungsten is removedby precipitation. In the filtrate, iron and cobalt are separated by means ofpaper chromatography. Cut out the portion of paper strip which contains onlyiron and extract with 0.1 N bydrochloric acid. Finally iron is determinedcolorimetrically. The amount of iron used in each test is 6.17γ throughout the whole work.The contaminated iron in iron-cobalt hydrochloric acid solution is first deter-mined by direct colorimetric method. When the ratios of iron to cobalt are1:10; 1:50; 1:100; 1:500, the relative errors are 0.3%, 2.9%, 11.8%, 33.1%respectively. If iron and cobalt are separated before the colorimetry, theaccuracy is improved. For the ratios of iron to cobalt equal to 1:50 until1:3000, the relative errors of the results are 0.3--3%. Therefore, when theratio of iron to cobalt exceeds 1:10, a separation is necessary. The separation of iron and cobalt is influenced by the method of preci-pitating tungsten. Using hydrochloric acid as precipitant when the ratio ofiron to cobalt is 1:3000, they can be separated clearly on Duren paper No. 261.While using hydrochlorie acid and cinchonine in saturated sodium chloridesolution as precipitant, iron and cobalt cannot be separated clear1y even at aratio 1:500. Because the presence of sodium chloride and cinchonine increasethe R_F value of cobalt and the cobalt spot overlaps the rear part of the iron. Accuracy is also affected by the nature of the paper. Duren paper No. 261is dense and even. Accurate results are obtained for solutions in which theratio of iron and cobalt is within 1:3000. With loose and uneven paper, thelong tail of iron appears on the paper when the ratio of iron to cobalt is1:500. Therefore, the latter is not recommended for this separation. It is also found that the accuracy of the method is affected by (1) theconcentration of cobalt, (2) the nature of the medium and also (3) the propertyof the paper.

测定铁、钴混合液中数微克的铁(钨已事先用化学方法除去),如铁钴之比为1:10或以下,可毋须分离,进行比色测定。如铁钴之比为1:50至1:3000,则用纸层析后再比色测定,结果良好(相对误差为0.3—3%)。溶液中如尚含其他化合物及滤纸之品质均对层析分离有影响。

Use of historical flood data makes it possible to extend more accurately the fre- quency curve beyond the observed portion.Careful examination of discharges and return periods is the key to the treatment of historical floods.For return periods,reasonable answer may be obtained by studying the historical literature. The representativeness of the observed series in a longer periodmay also affect either the extension of the frequency curve or the computed results of the statistical parameters. Comparing the observed...

Use of historical flood data makes it possible to extend more accurately the fre- quency curve beyond the observed portion.Careful examination of discharges and return periods is the key to the treatment of historical floods.For return periods,reasonable answer may be obtained by studying the historical literature. The representativeness of the observed series in a longer periodmay also affect either the extension of the frequency curve or the computed results of the statistical parameters. Comparing the observed series with the longer records of adjacent stations may throw light on the answer.Adjusting the frequency of observed data by Benson's formula P′=(a+[(N-a)/n]m)/(N+1)gives uncertain results.Actually the true P may lie on either side of P=m/(n+1),while Benson's formula always gives a larger P′.It is also not true even when the P of the smallest observation in n years is changed from n/(n+1)to N/(N+1). The statistical parameter of the discontinuous series may be computed by the tradi- tional method Q_0′=sum from 1 to N Q_i′/N after a new series(Q_1,Q_2,…,Q_M,…,Q_N)has been picked out from the cmperical frequency curve by making the frequency of each item follows the order of P=M/(N+1).The parameters can also be computed by the general formula Q_0′=ΣQ△p/Σ△P.While using the formula of Kritski and Menkel,atten- tion should be paid in examining the representativeness of the recorded series and as to whether a reasonable relation between N,n,and a exists.

历史洪水资料起着延长经验频率曲线,减少成果误差的作用。处理历史洪水的关键,在于正确审定其流量数值及重现期.后者可根据历史文献,考证更远时期中洪水发生的情况来估定。实测系列的代表性,对曲线的外延也有影响.可与邻近的长期站的观测资料,进行比较分析。应用本逊(M.A.Benson)公式 P′=(a+[(N-a)/n]m)/(N+1)来调整实测期洪水的频率,具有很大偶然性.因 P′恒大于 P=m/(n+1).而实际上,P′的真值也可小于 P.不连续系列统计参数的计算,可以按 P=M/(N+1)在频率线上取样,并分组计算。也可以历史洪水及实测洪水的各自机率为权数,进行加权计算.应用克里茨基-明克里公式时,需注意 n 年系列的代表性,及 N,a,n 间应有一定的关系.

The influence of hydrogen pressure on isomerization and hydrocracking reaction of C_(12)—C_(20) paraffinic hydrocarbons has been investigated over two types of catalysts. It has been found that on a cracking-type catalyst, NiS/SiO_2·Al_2O_3, raising the hydrogen pressure from 40 to 100 atm will be beneficial to the hydrocracking reaction of C_(16)—C_(20) normal paraffins, and that on an isomerization-type catalyst, WS_2·NiS/activated alumina, hydrogen pressure will exhibit a retarding effect on both the isomerization...

The influence of hydrogen pressure on isomerization and hydrocracking reaction of C_(12)—C_(20) paraffinic hydrocarbons has been investigated over two types of catalysts. It has been found that on a cracking-type catalyst, NiS/SiO_2·Al_2O_3, raising the hydrogen pressure from 40 to 100 atm will be beneficial to the hydrocracking reaction of C_(16)—C_(20) normal paraffins, and that on an isomerization-type catalyst, WS_2·NiS/activated alumina, hydrogen pressure will exhibit a retarding effect on both the isomerization and hydrocracking of C_(12)—C_(20) n-paraffins, but no retarding effect on the hydrocracking reaction of isoparaffins of about the same molecular weight.A parallel-and-consecutive reaction mechanism for the explanation of the experimental results has been proposed as follows: When using cracking-type catalyst, the hydrocracking reaction proceeds mainly through the K_3 path; while using isomerization-type, through the K_1—K_2 path.This proposed reaction mechanism may be superior to the consecutive reaction mechanism suggested by M. Pier in explaining the effects of hydrogen pressure on hydrocracking and isomerization of n-alkanes.

本文考察了氢压对C_(12)—C_(20)烷烃异构化与裂化的影响.指出在“裂化型”催化剂上氢压有利于正构烷的裂化反应;在“异构化型”催化剂上氢压阻抑正构烷的裂化与异构化反应,而对异构烷的裂化则无阻抑作用.根据实验结果与文献数据,讨论了在双重性催化剂上烷烃异构化与裂化反应的机理,并指出作者所提出的“混合历程”比之Pier的“串行历程”能更合理地解释烷烃的裂化与异构化反应,以及氢压对它们的影响.

 
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