From Two to One Index Isomorphism in Optimization Program for Quarterly Disaggregation of Annual Times Series

Journal of Advances in Mathematics and Computer Science ◽

10.9734/jamcs/2019/v34i1-230199 ◽

2019 ◽

pp. 1-15

Author(s):

Raïmi Aboudou Essessinou ◽

Guy Degla ◽

Babacar Mbaye Ndiaye

Keyword(s):

Mathematical Method ◽

National Accounts ◽

Optimization Program ◽

Single Index ◽

Times Series ◽

Resolution Algorithm ◽

Isomorphic Transformation ◽

The Cost

The quarterly disaggregation of an annual economic aggregate, by a mathematical method with a cyclical indicator, gives rise to a problem of minimization to make the quarterly economic aggregate smooth. This involves two indexes for the quarter and the year, which sometimes can make the resolution algorithm less efficient if the problem is large. In this paper we propose a method of indexing quarterly variables based on an isomorphic transformation of a two-index program into a one-index program, in order to minimize the cost of the algorithm of resolution. This method of continuous indexing of variables, applied to national accounts, shows that the algorithm with a single index is more efficient than the algorithm with two indexes when solving the optimization program of the quarterly disaggregation.

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Bleaching optimization at WestRock mill in Covington, Virginia

TAPPI Journal ◽

10.32964/tj15.9.581 ◽

2016 ◽

Vol 15 (9) ◽

pp. 581-586 ◽

Cited By ~ 1

Author(s):

RICARDO B. SANTOS ◽

PETER W. HART ◽

DOUGLAS C. PRYKE ◽

JOHN VANDERHEIDE

Keyword(s):

Hydrogen Peroxide ◽

Sodium Hydroxide ◽

Chlorine Dioxide ◽

Capital Expenditures ◽

Equipment Repair ◽

Optimization Program ◽

Hardwood Pulp ◽

Improved Performance

The WestRock mill in Covington, VA, USA, initiated a long term diagnostic and optimization program for all three of its bleaching lines. Benchmarking studies were used to help identify optimization opportunities. Capital expenditures for mixing improvement, filtrate changes, equipment repair, other equipment changes, and species changes were outside the scope of this work. This focus of this paper is the B line, producing southern hardwood pulp in a D(EP)DD sequence at 88% GE brightness. The benchmarking study and optimization work identified the following opportunities for improved performance: nonoptimal addition of caustic and hydrogen peroxide to the (EP) stage, carryover of D0 filtrate to the (EP) stage, and carryover of (EP) filtrate to the D1 stage. As a result of actions the mill undertook to address these opportunities, D0 kappa factor decreased about 5%, sodium hydroxide consumption in the (EP) stage decreased about 35%, chlorine dioxide consumption in the D1 stage decreased about 25%, and overall bleaching cost decreased about 15%.

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Severity of interrogators lawful psychological influence determinants indicators dynamics (on the example of interrogation actions) in the process of influence skills optimization program approbation

Science and Education a New Dimension ◽

10.31174/send-pp2020-239viii95-17 ◽

2020 ◽

Vol VIII(239) (95) ◽

pp. 67-70

Author(s):

O. O. Chepur ◽

O. V. Zemlianska

Keyword(s):

Optimization Program ◽

Psychological Influence

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Identification of Nonlinear Times Series from First Order Cumulative Characteristics.

10.21236/ada239822 ◽

1991 ◽

Author(s):

Ian W. McKeague ◽

Mei-Jie Zhang

Keyword(s):

First Order ◽

Times Series

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Enhancing Efficiency of Full-Scale Ultrafiltration Membrane Treatment for Increased Capacity and Lower Operating Costs

Water Practice & Technology ◽

10.2166/wpt.2010.086 ◽

2010 ◽

Vol 5 (4) ◽

Author(s):

M.C. White PE ◽

M.J. Kosterman

Keyword(s):

Citric Acid ◽

Water Treatment ◽

Operating Costs ◽

Percent Reduction ◽

Chemical Cleaning ◽

Optimization Program ◽

Systematic Optimization ◽

Percent Increase ◽

Treatment Facilities ◽

Membrane Treatment

At time of commissioning, the Racine, Wisconsin, USA ultrafiltration (UF) membrane treatment system fail short of meeting its operational goals concerning capacity and chemical cleaning intervals. The systematic optimization of this 189-million-litre-per-day (MLD) capacity UF system provided tangible operational benefits, which included a 30-percent reduction in power use, a 50-percent reduction in chlorine chemical use, a 36-percent reduction in citric acid use and a simultaneous 7-percent increase in net treatment capacity of the system. In addition, the optimization program reduced the level of buildup of foulants on the surface of the membranes. This paper summarizes the optimization procedures followed at Racine, discussing how similar measures may be applicable to other water treatment facilities.

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