Genetic parameters and principal components analysis of breeding value for birth and weaning weight in Egyptian buffalo

Salem, Mohamed Mahmoud Ibrahim,Amin, Amin Mohamed Said,Ashour, Ayman Fouad,Ibrahim, Mohamed Mohamed El-said,Abo-Ismail, Mohammed Kotb Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.1

Objective: The objectives of the current study were to study the main environmental factors affecting birth weight (BW) and weaning weight (WW), estimate variance components, genetic parameters and genetic trend and to evaluate the variability and relationships among breeding value of BW and WW using principal components analysis (PCA). Methods: A total of 16,370 records were collected from 8,271 buffalo calves. Genetic parameters and breeding values were estimated using a bivariate animal model which includes direct, maternal and permanent maternal effects. These estimates were standardized and used in PCA. Results: The direct heritability estimates were 0.06 and 0.41 for BW and WW, respectively whereas direct maternal heritability values were 0.03 and 0.14, respectively. Proportions of variance due to permanent environmental effects of dam were 0.455 and 0.280 for BW and WW respectively. The genetic correlation between BW and WWs was weak approaching zero, but the maternal correlation was 0.26. The first two principal components (PC1 and PC2) were estimated utilizing the standardized breeding values according to Kaiser method. The total variance explained by the first two PCs was 71.17% in which 45.91% and 25.25% were explained by PC1 and PC2, respectively. The direct breeding values of BW were related to PC2 but those of WW and maternal breeding values of BW and WWs were associated with PC1. Conclusion: The results of genetic parameters and PCA indicate that BW and WWs were not genetically correlated and improving growth traits of Egyptian buffaloes could be achieved using WW without any adverse effect by BW.

Physico-chemical variation in bentonite by sulfuric acid activation

Amin Salem,Leila Karimi 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.4

The physico-chemical behavior of Iranian typical bentonite was characterized during the activation process by sulfuric acid. The main variations were studied by evaluating specific surface area, chemical and mineralogical composition, thermal gravimetric curves, Fourier transform infrared spectrometry pattern, and morphology of starting and activated samples. The effects of acid concentration, particle size distribution, activation temperature and time on specific surface area were discussed. It was found that the above parameters have significant role in the activation process. The optimum condition was also obtained for the activation of typical bentonite.

Application of Iranian nano-porous Ca-bentonite for recovery of waste lubricant oil by distillation and adsorption techniques

Shiva Salem,Amin Salem,Aylin Agha Babaei 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-

The nano-porous adsorbents were initially produced by acid treatment of natural clay. The effects of some important factors such as acid type, concentration and residence time were evaluated on porous structure of adsorbent. A reduction about 2.7 A˚ was observed in the distance of montmorillonite layers due to replacement of hydrogen ions in the presence of sulfuric acid. The number of nano-pores, 12 nm, was preferable for removal of contaminations from spent engine oil, depending on the activation agent type in the treatment process. The results are very promising for reduction of adsorbent content in the regeneration of waste lubricant oil.

Influence of sintering temperature on microstructural changes of ceramic Raschig ring

Mehdi Salehi,Amin Salem 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.2

The thermal behavior of Illitic-kaolinitic clay for manufacturing of low porosity ceramic Raschig rings was characterized during the sintering process. The samples were shaped by extrusion method and fired at different temperatures from 1,100 to 1,300℃. The main physical-chemical transformations were studied by evaluating changes in shrinkage, water absorption, porosity, mechanical strength, microstructure and mineralogical compositions. The optimum sintering condition was found to obtain maximum mechanical strength. Chemical resistance of ceramic Raschig rings also was determined according standard method. It was shown that the better chemical resistance could be attributed to the different mineralogical compositions, in particular with presence of mullite phase.

Preparation of thermally recyclable γ-alumina nanoparticles from boehmite for adsorption of anionic dyes: Spectrophotometric study, structural characterization and industrial experience

Amir Hossein Razm,Amin Salem,Shiva Salem 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.4

γ-Alumina powders were produced from the calcination of pseudo-boehmite for scavenging anionic blue (RS 150), and red (RB 133) dyes. The effects of calcination temperature, soaking time, pH, and nanoparticle dosage on dye adsorption were investigated to fabricate a reusable adsorbent. The mentioned dyes can be efficiently adsorbed over the γ-alumina nanoparticles if the calcination conditions, and pH are identified correctly. The powder calcined at 700 °C within 30 min inherently exhibited a high affinity towards blue dye at pH 5.0, while the proper adsorption towards red dye was achieved at pH 2.0. The maximal blue, and red dye adsorption capacities were determined to be 303, and 417 mg L−1, respectively. Although the calcination of boehmite at 1,000 °C led to the higher chemical resistance, the specific surface area significantly decreased from 202 to 126 m2 g−1, causing a significant drop in the adsorption of blue dye due to an increase in pore diameter, 6 nm. Importantly, the adsorptive performance of produced powder was stable with ten times thermal regeneration. Based on results obtained for the treatment of industrial textile wastewater, the fabricated γ-alumina powder is promising material to adsorb the anionic dyes.

Management of the energy harvesting for MEMS/NEMS via newmark current method

Shang, Kun,Shan, Huafeng,Alkhalaf, Salem,Marzouki, Riadh,Khadimallah, Mohamed Amine Techno-Press 2022 Advances in nano research Vol.12 No.6

The free and forced vibration in addition to electric energy harvesting of a piezoelectric disk resting on two-parameter foundation modeled by modified couple stress as well as Kirchhoff plate theory is probed. The governing equations and boundary conditions are obtained using Hamilton's principle. Then, the free and forced vibration are solved using numerical solutions, generalized differential quadrature method (GDQM) and Newmark-beta method. The forced vibration is resulted from a base excitation load. Also, the possible voltage which can be harvested from this system is obtained using generalized integral quadrature method. The validity of the formulation and solution procedure is confirmed using a compassion study. The impact of parameters such as length effect, inner to outer radius ratio, and foundations parameters on the free and forced vibration as well as energy harvesting is investigated in detail. This paper can be a basis for future studies in the area of piezoelectric harvesters in small scales.

Synthesis and characterization of indium-borate glassceramic containing Eu0.01Ce0.74 Zr0.25O1.995 via an incorporation method

Abdolali Alemi,Leila Kafi-Ahmadi,Ali Akbar Khandar,Amin Salem 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6

Glass in the system 5In2O3.94Na2B4O7 was fabricated via a melt quenching technique. The amorphous nature of the quenched glass was confirmed by X-ray powder diffraction. The infrared spectrum shows no boroxol ring formation in the structure of this glass. Differential thermal analysis shows a glass transition temperature of 696 oC and a crystallization temperature of 1151 oC. A cerium–zirconium mixed oxide Ce0.75Zr0.25O2 and Eu-doped cerium-zirconium mixed oxide were obtained by a solid-state method. Then the glass powder and Eu-doped cerium-zirconium mixed oxide were mixed. The mixture was heated in a crucible. The glass-ceramic sample was obtained by pouring the melts onto stainless steel plates. The samples obtained were annealed at 450 oC for 1 h to remove the thermal strain. Gas phase catalytic oxidation of toluene was studied over these nanostructures. The results showed that the catalytic activity of Eu0.01Ce0.74Zr0.25O1.995 was higher than Ce0.75Zr0.25O2 for conversion of toluene. Differential thermal analysis for a glass-ceramic sample shows a glass transition temperature of 648 oC and a crystallization temperature of 1134 oC. A scanning electron microscopy study of the glass-ceramic indicates that the crystallized glass consists of crystals with an average diameter of about 86 nm dispersed in glassy regions.