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Ghaffar, A.,Shimizu, H. Asian Australasian Association of Animal Productio 1993 Animal Bioscience Vol.6 No.4
Four truncation selection schemes (SSs) were framed to predict and compare the age structures and genetic responses under the influence of various factor employing the scheme-specific algorithms. Two paths of selection, sires (bulls' sires) and dams (bulls' dams) to breed young bulls were considered. Among variable factors, four levels (0.3, 0.5, 0.7, 0.9) of precision of evaluation, five levels (0.0, 0.05, 0.10, 0.15, 0.20 genetic standard deviation) of genetic differences among age classes and 4 levels of proportions selected (for bulls' sire, 0.05, 0.10, 0.125, 0.25, and for bulls' dams 0.02, 0.04, 0.05, and 0.10) contemplated on both paths of selection. The number of age classes for bulls' dams and bulls' sires were 4 or 8 and 2 or 4, respectively. The stayability across age classes for bulls' dams was assumed to be 0.80 or 0.60. The candidates for selection for bulls' sires were equally distributed (0.5 or 0.25) across the age classes. The SS1 (selection on same proportions as candidates' distribution) revealed longest generation lengths and lowest yearly genetic responses. The average ages were youngest and yearly genetic responses were highest in SS4 (selection at each age-specific truncation point with the same average genetic superiority of selected parents across the ages) and followed by SS3 (selection at each agespecific truncation point with same predicted genetic values) and SS2 (selection at common truncation point on phenotypic values) in a population with overlapping generations. The results revealed the importance of choosing suitable selection scheme to acquire maximum yearly genetic responses especially when the genetic differences among age classes are large and the precision of evaluation is relatively low.
THE (k, s)-FRACTIONAL CALCULUS OF CLASS OF A FUNCTION
Rahman, G.,Ghaffar, A.,Nisar, K.S.,Azeema, Azeema The Honam Mathematical Society 2018 호남수학학술지 Vol.40 No.1
In this present paper, we deal with the generalized (k, s)-fractional integral and differential operators recently defined by Nisar et al. and obtain some generalized (k, s)-fractional integral and differential formulas involving the class of a function as its kernels. Also, we investigate a certain number of their consequences containing the said function in their kernels.
Modeling study on CO2 and H2S simultaneous removal using MDEA solution
Tohid Nejad Ghaffar Borhani,Morteza Afkhamipour,Abbas Azarpour,Vahid Akbari,Seyed Hossein Emadi,Zainuddin A. Manan 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
This study presents a rate-based model of an absorber packed column for simultaneous absorptions ofacid gases into methyldiethanolamine (MDEA) aqueous solution. The model is in good agreement withexperimental data. The parametric study showed that the concentration of acid gases in the sweet gasstream increases by decrease in the specific surface area of packing. The peak of selectivity factordecreases with the increase in the mole ratio of CO2/H2S in the gas feed along the packed column. Thesensitivity analysis reveals that selecting the accurate correlations of the gas-side mass transfercoefficient and specific surface area is vital.
THE (k, s)-FRACTIONAL CALCULUS OF CLASS OF A FUNCTION
( G. Rahman ),( A. Ghaffar ),( K. S. Nisar ),( Azeema ) 호남수학회 2018 호남수학학술지 Vol.40 No.1
In this present paper, we deal with the generalized (k, s)-fractional integral and differential operators recently defined by Nisar et al. and obtain some generalized (k, s)-fractional inte-gral and differential formulas involving the class of a function as its kernels. Also, we investigate a certain number of their consequences containing the said function in their kernels.
Maleic diamides as photostabilizers for polystyrene
Samira T. Rabie,M.A. Abd El-Ghaffar,Ahmed E. Ahmed,Magdy W. Sabaa 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
Some condensation maleic diamide adducts were prepared, characterized, and evaluated as photostabilizers for polystyrene. The potency of these diamides was determined by measuring the extent of weight loss (%), formed gel as well as the average molecular weights MV of the soluble fractions of the degraded polymers. The results indicated a good stabilizing effect of these products compared with the commercial UV absorber, phenyl salicylate. FTIR spectra of both neat and photoirradiated stabilized polystyrene gave an explanation of some photodegraded products of polystyrene. A probable radical mechanism is proposed to account for the stabilizing action of the diamide derivatives as photostabilizers.
Ahmad Kultur Hia,Akhmetova Gulmira,Nurpeiis Gulshat Sakenkyzy,Kenzhegaliyeva Zita,Muneam Hussein Ali,Ghaffar Ahmad Hussein,A. Heri Iswanto,Dedy Achmad Kurniady,Dani Hidayatuloh 대한산업공학회 2022 Industrial Engineeering & Management Systems Vol.21 No.2
Reliability is referred to as quality over time and one of the dimensions of quality. Improving product reliability is one of the major concerns in manufacturing and service processes that can be achieved by applying statistical process control. Statistical control chart is a process monitoring tool that is widely used in the manufacturing industry and can be used to monitor the failure process. The development of control charts for this purpose is one of the topics of interest to researchers in the field of reliability. However, research in this area has been limited to the development of control charts for separate monitoring of statistical indicators. In the present study, a new control chart will be proposed to monitor failure times and product reliability. The purpose of this chart is to simultaneously monitor various parameters of failure time distribution. For this purpose, in this research, normal distribution and normal log are investigated
Hadeel G. El-Shorbagy,Salah M. El-kousy,Khalid Z. Elwakeel,M.A. Abd El-Ghaffar 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.100 No.-
A simple and economical method for modifying chitosan based on non-catalytic direct condensationreaction between chitosan and phenolic acids “Gallic and Caffeic acids” has been developed to producecondensation adduct resins RI and RII. The resins structure and morphology were confirmed by physicaland chemical tools such as FTIR, SEM, EDX, XRD elemental analysis, TGA, water regain, dissociation inacidic medium, and point of zero charge. The new resins were evaluated as silver ions adsorbents. Factorsaffecting adsorption, as well as kinetics, equilibrium, and thermal properties of adsorption, were studiedusing conventional equations. The new resins showed more efficient removal of toxic silver ions from theaqueous medium than parent chitosan polymer. The maximum adsorption capacity amounted to 67.5,300, and 278 mg/g with removal efficiency reaching 22.5%, 100%, and 92.66% for chitosan, RI, and RII;respectively at pH 6.5 and initial silver concentration 300 mg/L. The new resins showed spontaneouschemisorption toward silver ions with exothermic nature for RI, and endothermic nature for RII. The newcondensation adduct resins showed good re-use ability reaching 83% and 67% for RI and RII; respectively,by using 0.01 M nitric acid solution.