Cronbach’s Alpha coefficient is the most popular method of examining reliability. It is typically used when the researcher has several Likert-type items that are summed or averaged to make a composite score. Distribu...Cronbach’s Alpha coefficient is the most popular method of examining reliability. It is typically used when the researcher has several Likert-type items that are summed or averaged to make a composite score. Distribution of alpha coefficient has been subjected of many studies. In this study relationship between randomness and Cronbach alpha coefficient were investigated and in this context, present study was examined the question“What is the distribution of the coefficient alpha when a Likert-type scale is answered randomly?” Data were generated in the form of five point Likert-type items and Monte Carlosimulation was run for 5000 times for different item numbers.展开更多
Analyses of astrophysics and electrostatic separation data were illustrated with the Asymptotic Curve Based and Proportionality Oriented (ACP) nonlinear math for relating two physical variables. The fundamental physic...Analyses of astrophysics and electrostatic separation data were illustrated with the Asymptotic Curve Based and Proportionality Oriented (ACP) nonlinear math for relating two physical variables. The fundamental physical law asserts that the nonlinear change of continuous variable Y is proportional to the nonlinear change in continuous variable X. Mathematically, this is expressed as dα{Y, Yu, Yb} = −Kdβ{X, Xu, Xb}, with Yu, Yb, Xu, and Xb representing the upper and baseline asymptotes of Y and X. Y is the continuous cumulative numbers of the elementary y and X is the continuous cumulative numbers of elementary x. K is the proportionality constant or equally is the rate constant.展开更多
Two alpha functions(BM,SRW) and three different mixing rules(MHV2,WS,HG) for the PR and RKS-EOS were investigated in the vapor-liquid equilibrium calculation of related binary systems for Fischer-Tropsch synthesis oil...Two alpha functions(BM,SRW) and three different mixing rules(MHV2,WS,HG) for the PR and RKS-EOS were investigated in the vapor-liquid equilibrium calculation of related binary systems for Fischer-Tropsch synthesis oil system.Furthermore,two different equations of states(EOS) of SR-POLAR and PC-SAFT,together with two activity coefficient equations of UNIF-DMD and UNIF-HOC were investigated.The results showed that various prediction methods had similar deviations for weakly polar systems.However,these method had different prediction abilities for other systems.UNIF-DMD,RKS-HG and RKS-MHV2 models gave more accurate prediction for non-associating strongly polar system,RKS-MHV2 and UNIF-HOC models showed the smallest deviation for associating strongly polar system containing water,UNIF-HOC and SR-POLAR models showed the smallest deviation for associating strongly polar system containing acids,and UNIF-HOC,SR-POLAR models showed the smallest deviation for other associating strongly polar systems,while RKS-MHV2 and RKS-HG took the second place.PC-SAFT model would bring big deviation for unsymmetrical system when binary parameters were lacking,but would give small deviation for all systems when binary parameters were available.展开更多
文摘Cronbach’s Alpha coefficient is the most popular method of examining reliability. It is typically used when the researcher has several Likert-type items that are summed or averaged to make a composite score. Distribution of alpha coefficient has been subjected of many studies. In this study relationship between randomness and Cronbach alpha coefficient were investigated and in this context, present study was examined the question“What is the distribution of the coefficient alpha when a Likert-type scale is answered randomly?” Data were generated in the form of five point Likert-type items and Monte Carlosimulation was run for 5000 times for different item numbers.
文摘Analyses of astrophysics and electrostatic separation data were illustrated with the Asymptotic Curve Based and Proportionality Oriented (ACP) nonlinear math for relating two physical variables. The fundamental physical law asserts that the nonlinear change of continuous variable Y is proportional to the nonlinear change in continuous variable X. Mathematically, this is expressed as dα{Y, Yu, Yb} = −Kdβ{X, Xu, Xb}, with Yu, Yb, Xu, and Xb representing the upper and baseline asymptotes of Y and X. Y is the continuous cumulative numbers of the elementary y and X is the continuous cumulative numbers of elementary x. K is the proportionality constant or equally is the rate constant.
文摘Two alpha functions(BM,SRW) and three different mixing rules(MHV2,WS,HG) for the PR and RKS-EOS were investigated in the vapor-liquid equilibrium calculation of related binary systems for Fischer-Tropsch synthesis oil system.Furthermore,two different equations of states(EOS) of SR-POLAR and PC-SAFT,together with two activity coefficient equations of UNIF-DMD and UNIF-HOC were investigated.The results showed that various prediction methods had similar deviations for weakly polar systems.However,these method had different prediction abilities for other systems.UNIF-DMD,RKS-HG and RKS-MHV2 models gave more accurate prediction for non-associating strongly polar system,RKS-MHV2 and UNIF-HOC models showed the smallest deviation for associating strongly polar system containing water,UNIF-HOC and SR-POLAR models showed the smallest deviation for associating strongly polar system containing acids,and UNIF-HOC,SR-POLAR models showed the smallest deviation for other associating strongly polar systems,while RKS-MHV2 and RKS-HG took the second place.PC-SAFT model would bring big deviation for unsymmetrical system when binary parameters were lacking,but would give small deviation for all systems when binary parameters were available.
