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Homogeneous Fluid Turbulence before the Final Period of Decay for Four-Point Correlation in a Rotating System for First-Order Reactant
M. Monuar Hossain,
M. Abu Bkar Pk,
M. S. Alam Sarker
Issue:
Volume 3, Issue 4, July 2014
Pages:
81-89
Received:
6 June 2014
Accepted:
27 June 2014
Published:
30 June 2014
Abstract: Following Deissler’s approach, the decay in homogeneous turbulence at times preceding to the ultimate phase for the concentration fluctuation of a dilute contaminant undergoing a first-order chemical reaction in a rotating system for the case of four-point correlation is studied. Two-, three-, and four-point correlation equations have been obtained and the correlation equations are converted to spectral form by their Fourier-transform, the terms containing quintuple correlations are neglected in comparison to the third and fourth order correlation terms. Finally, integrating the energy spectrum over all wave numbers, the energy decay law of homogeneous turbulent flow for the concentration fluctuations ahead of the ultimate phase in a rotating system for four-point correlation has been obtained and it is shown by graphically in the text.
Abstract: Following Deissler’s approach, the decay in homogeneous turbulence at times preceding to the ultimate phase for the concentration fluctuation of a dilute contaminant undergoing a first-order chemical reaction in a rotating system for the case of four-point correlation is studied. Two-, three-, and four-point correlation equations have been obtained...
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Statistical Process Control Analysis Based on Software Q-Das
Wu Guoqing,
Luo Yiping,
Ren Hongjuan
Issue:
Volume 3, Issue 4, July 2014
Pages:
90-95
Received:
19 June 2014
Accepted:
5 July 2014
Published:
20 July 2014
Abstract: The software Q-das used in statistical analysis of the production process can realize the real-time monitoring during the production process. So as to effectively support the needs of the factory in data management, long-term backup and automatic report generation. This paper tells some specific evaluation method of statistical quality control, such as single value chart, control charts, process capability index, etc. Through these configurations of figures, tables, and statistical analysis, “correctly observe” the entire production process. Control and suppress the fluctuations that occur during production. At last, this paper tells the Q-das software in statistical process control analysis application based on a specific example.
Abstract: The software Q-das used in statistical analysis of the production process can realize the real-time monitoring during the production process. So as to effectively support the needs of the factory in data management, long-term backup and automatic report generation. This paper tells some specific evaluation method of statistical quality control, suc...
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Research on Construction of the Green Logistics Evaluation Index System and Determination of Index Weight
Li Zhou,
Jie Zhu,
Jian Guo
Issue:
Volume 3, Issue 4, July 2014
Pages:
96-99
Received:
1 July 2014
Accepted:
16 July 2014
Published:
30 July 2014
Abstract: The evaluation index system of green logistics development is the focus of this paper. Through the questionnaire investigation and expert scoring method obtains the judgment matrix. By using the analytic hierarchy process and fuzzy comprehensive evaluation method establishes the weight of each index. The conclusion of this paper would lay the foundation for the theory and method of green logistics statistical evaluation.
Abstract: The evaluation index system of green logistics development is the focus of this paper. Through the questionnaire investigation and expert scoring method obtains the judgment matrix. By using the analytic hierarchy process and fuzzy comprehensive evaluation method establishes the weight of each index. The conclusion of this paper would lay the found...
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On the Detection of Influential Outliers in Linear Regression Analysis
Arimiyaw Zakaria,
Nathaniel Kwamina Howard,
Bismark Kwao Nkansah
Issue:
Volume 3, Issue 4, July 2014
Pages:
100-106
Received:
11 July 2014
Accepted:
21 July 2014
Published:
30 July 2014
Abstract: In this paper, we propose a measure for detecting influential outliers in linear regression analysis. The performance of the proposed method, called the Coefficient of Determination Ratio (CDR), is then compared with some standard measures of influence, namely: Cook’s distance, studentised deleted residuals, leverage values, covariance ratio, and difference in fits standardized. Two existing datasets, one artificial and one real, are employed for the comparison and to illustrate the efficiency of the proposed measure. It is observed that the proposed measure appears more responsive to detecting influential outliers in both simple and multiple linear regression analyses. The CDR thus provides a useful alternative to existing methods for detecting outliers in structured datasets.
Abstract: In this paper, we propose a measure for detecting influential outliers in linear regression analysis. The performance of the proposed method, called the Coefficient of Determination Ratio (CDR), is then compared with some standard measures of influence, namely: Cook’s distance, studentised deleted residuals, leverage values, covariance ratio, and d...
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Neighbor Designs: A New Approach of Local Control
Naqvi Hamad,
Najeeb Haider
Issue:
Volume 3, Issue 4, July 2014
Pages:
107-110
Received:
16 July 2014
Accepted:
5 August 2014
Published:
10 August 2014
Abstract: It is well known that randomization, replication and local control play important role in experimental design. Neighbor designs provide a tool for local control in situation where experimental units are influenced by neighboring units. A neighbor design is called one-dimensional if neighbor effects are controlled in only one way, i.e., either in row or in column direction. In two-dimensional design, neighbor effects are controlled in both ways (rows and columns). In this paper the concept of neighbor designs, its types and importance is discussed with examples. Models of Neighbor effects for different situations are also discussed.
Abstract: It is well known that randomization, replication and local control play important role in experimental design. Neighbor designs provide a tool for local control in situation where experimental units are influenced by neighboring units. A neighbor design is called one-dimensional if neighbor effects are controlled in only one way, i.e., either in ro...
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Comparison of Precision of Systematic Sampling with Some other Probability Samplings
Issue:
Volume 3, Issue 4, July 2014
Pages:
111-116
Received:
10 July 2014
Accepted:
7 August 2014
Published:
20 August 2014
Abstract: This paper provides some discussion about the problem of precision of systematic and other related sampling methods. Comparison among these samples and the estimators are made using some empirical evidences from a finite population analysis.
