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parameter estimating
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  parameter estimating
Application of martingale arguments to the regression parameter estimating function show the Breslow (1974) estimator to be consistent and asymptotically Gaussian under this model.
      
Compared with other traditional methods, this control law reduces on-line parameter estimating burden.
      
The 15 L volume provides sufficient biomass to conduct parameter-estimating experiments from a BNR-functioning biomass.
      
This concept is consistent with low-order autoregressive linear models, and is routinely used for parameter estimating.
      


Two samples containing more than 99% of 1-methyl, 4-ethyl benzene (PMEB) and methyl styrene (MS) respectively were obtained from C_(?) aromatic hydrocarbons by rectfication. Seven solvents were evaluated for separation of PMEB and MS by gas chromatography. They were tributyl phosphate, sulfolane, 5, N-dimethyl pyrrolidone(5, NMP), N-methyl, 2-pyrrolidone (NMP), dimethyl phthalate (DMP), diethylene glycol, and β, β′-oxydipropionit rile. The vapor-liquid equilibria (VLE) for six systems were determined at different...

Two samples containing more than 99% of 1-methyl, 4-ethyl benzene (PMEB) and methyl styrene (MS) respectively were obtained from C_(?) aromatic hydrocarbons by rectfication. Seven solvents were evaluated for separation of PMEB and MS by gas chromatography. They were tributyl phosphate, sulfolane, 5, N-dimethyl pyrrolidone(5, NMP), N-methyl, 2-pyrrolidone (NMP), dimethyl phthalate (DMP), diethylene glycol, and β, β′-oxydipropionit rile. The vapor-liquid equilibria (VLE) for six systems were determined at different temperatures by using Junghan's still. The systems were as follows. (1)323.2, 343.2, 363.2K, PMEB—MS; (2)353.2, 363.2K, MS—NMP; (3)353.2, 363.2K, PMEB—NMP; (4)363.2K, PMEB—MS—NMP; (5)363.2K, PMEB—MS—DMP; and ( 6)363.2K, PMEB—MS—sulfolane. For binary systems, data obtained were correlated with Wilson equation. By use of Wilson parameters estimated from binary systems, the VLE for the ternary (4) were calculated. Results showed that calculated values were in good agreement with experimental values. And the mean deviation of gas compositions was 0.0259(mole fraction).

从C_9芳烃精馏提纯得到含量均大于99%的对甲乙苯(PMEB)和甲基苯乙烯(MS)。为寻找分离它们的合适溶剂,用色谱法比较了七种溶剂,即:磷酸三丁酯、环丁矾、5,N-二甲基吡咯烷酮(5,NMP)、N-甲基吡略烷酮(NMP)、邻苯二甲酸二甲酯(DMP)、二甘醇和β,β′-氧二丙腈。用鼓泡平衡釜测定了六个体系在不同温度下的汽液平衡数据,它们是①PMEB-MS;②MS-NMP;③PMEB-NMP;④PMEB-MS-NMP;⑤PMEB-MS-环丁矾;⑥PMEB-MS-DMP。回归求得了所测二元系的Wilson参数,并以此推算了PMEB-MS-NMP系的汽液平衡,与实测值相比,汽相平均偏差为0.0259(摩尔分数)。

Two samples containing more than 99% 17methy1-4-ethyl benzene(PMEB)and methyl styrene(MS) respectively were obtained from C_9 aromatic hydrocarbonsby rectification.Seven solvents were evaluated for separation of PMEB and MS by gas chromatography.The vapor-liquid equilibria(VLE) for six systems were determined at differ-ent temperatures by using Junghan's still.For binary systems,data obtained were correlated with Wilson equation.Byuse of Wilson parameters estimated from binary system,tile VLE for the ternarysystem...

Two samples containing more than 99% 17methy1-4-ethyl benzene(PMEB)and methyl styrene(MS) respectively were obtained from C_9 aromatic hydrocarbonsby rectification.Seven solvents were evaluated for separation of PMEB and MS by gas chromatography.The vapor-liquid equilibria(VLE) for six systems were determined at differ-ent temperatures by using Junghan's still.For binary systems,data obtained were correlated with Wilson equation.Byuse of Wilson parameters estimated from binary system,tile VLE for the ternarysystem PMEB-MS-N-methy1-2-pyrrolidone were calculated.Results showed thatthe calculated values were in good agreement with experimental values.Themean deviation of gas composition was 0.0259(mole fraction).

为从 C_9芳烃中分离对甲乙苯和甲基苯乙烯,用色谱法对七种溶剂进行了筛选,并且用鼓泡平衡釜测定了六个体系在不同温度下的汽液平衡数据。回归求得了所测二元系的 Wilson 参数,从此推算了对甲乙苯-甲基苯乙烯-N-甲基吡咯烷酮体系的汽液平衡数据。

In this paper,the hydrocracking of Gudao residue in the presence of dispersed-phase Mo catalyst,i.e. ,ammonium phosphomolybdate(APM),was studied in a highpressure autoclave at 390~435C and 7.0 MPa hydrogen initial pressure.A kinetic modelwas developed on the basis of the six pseudo-components,comprising of fractions of thecracked residue(asphaltenes, resins,aromatics and saturates),coke(benzene insoluble)and volatiles(480℃). The reaction network included the eight reactions,i.e.,the first or-der reactions with...

In this paper,the hydrocracking of Gudao residue in the presence of dispersed-phase Mo catalyst,i.e. ,ammonium phosphomolybdate(APM),was studied in a highpressure autoclave at 390~435C and 7.0 MPa hydrogen initial pressure.A kinetic modelwas developed on the basis of the six pseudo-components,comprising of fractions of thecracked residue(asphaltenes, resins,aromatics and saturates),coke(benzene insoluble)and volatiles(480℃). The reaction network included the eight reactions,i.e.,the first or-der reactions with respect to the four reactions of resins(resins cracked to aromatics, satu-rates and volatiles,and condensed to asphaltenes),and the two reactions of aromatics andsaturates to volatiles,as well as the reaction of asphaltenes cracked to valatiles, leaving thecondensation of asphaltenes (coke formation)ascribed to the second order reaction,The re-action rate constants and the activation energies were calculated using the complex method(i.e,,the randomly generated parameter estimates).The results indicated that there wasconvergence between the experimental data and the model predictiOn,the rate constants fol-lowed the Arrhenius relationship,the activation energies were reasonable for the eight reac-tions included in the network.This suggested that the six lumps kinetics model was reason-able for the hydrocracking of Gudao residue in the presence of dispersed phase Mo catalyst.

研究了孤岛渣油在分散型磷钼酸铵催化剂存在下加氢裂化反应的动力学规律。将反应物系分为裂化产物(<480℃)、饱和分、芳香分、胶质、沥青质和焦炭(苯不溶物)六个集总,并提出了包含二级反应(沥青质缩合生焦反应)的六集总一级动力学网络;进而用复合形法求算了动力学网络的速率常数和活化能。结果表明,模型计算值与实验数据较为吻合,所提动力学模型对在分散型催化剂存在下孤岛渣油的加氢裂化反应是合理的。

 
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