Production of Nanocrystalline Nickel Silver Powder by Mechanical Alloying

Saidi Ali,Karbasi Maryam 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1

Localization of solar-hydrogen power plants in the province of Kerman, Iran

Mostafaeipour, Ali,Sedaghat, Ahmad,Qolipour, Mojtaba,Rezaei, Mostafa,Arabnia, Hamid R.,Saidi-Mehrabad, Mohammad,Shamshirband, Shahaboddin,Alavi, Omid Techno-Press 2017 Advances in energy research Vol.5 No.2

This research presents an in-depth analysis of location planning of the solar-hydrogen power plants for electricity production in different cities situated in Kerman province of Iran. Ten cities were analyzed in order to select the most suitable location for the construction of a solar-hydrogen power plant utilizing photovoltaic panels. Data envelopment analysis (DEA) methodology was applied to prioritize cities for installing the solar-hydrogen power plant so that one candidate location was selected for each city. Different criteria including population, distance to main road, flood risk, wind speed, sunshine hours, air temperature, humidity, horizontal solar irradiation, dust, and land costare used for the analysis. From the analysis, it is found that among the candidates' cities, the site of Lalezar is ranked as the first priority for the solar-hydrogen system development. A measure of validity is obtained when results of the DEA method are compared with the results of the technique for ordering preference by similarity to ideal solution (TOPSIS). Applying TOPSIS model, it was found that city of Lalezar ranked first, and Rafsanjan gained last priority for installing the solar-hydrogen power plants. Cities of Baft, Sirjan, Kerman, Shahrbabak, Kahnouj, Shahdad, Bam, and Jiroft ranked second to ninth, respectively. The validity of the DEA model is compared with the results of TOPSIS and it is demonstrated that the two methods produced similar results. The solar-hydrogen power plant is considered for installation in the city of Lalezar. It is demonstrated that installation of the proposed solar-hydrogen system in Lalezar can lead to yearly yield of 129 ton-H2 which covers 4.3% of total annual energy demands of the city.

Production of high purity magnetic nickel powder from spent DRI catalyst via cementation method

Hossein Aboody,Ali Taheri Najafabadi,Majid Saidi 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-

In the present study, a novel two-step method was developed to synthesize high purity magnetic nickelfrom spent direct reduction of iron (DRI) catalyst. Initially, nickel was leached from spent DRI catalyst byhydrochloric acid and the effect of important parameters including temperature (25–85 C), leachingtime (30–210 min), acid concentration (1–5 M) and average catalyst particle size (111–325 lm) werestudied using design of experiments (DOE) approach. 100% Ni extraction with negligible Al dissolution(<0.5%) could be achieved at a temperature of 46 C, leaching time of 172 min, the acid concentrationof 4 M and particle size of 111 lm. Next, the nickel cementation by aluminium powder was investigatedthoroughly by considering solution initial pH, aluminium particle size and its addition method, pHadjustment method and temperature as important variables. The structural properties of cemented nickelwere characterized by FESEM, XRD and EDX analysis. It was observed that through treating of the optimalleached liquor with 2Msodium hydroxide, more than 96% of Ni could be recovered by gradual addition ofexcess Al powder to the solution with initial pH of 0.2. The purity of cemented Ni would be 98.5% if thecementation process was performed at 80 C.

On vibration and flutter of shear and normal deformable functionally graded reinforced composite plates

Mahdieh Abdollahi,Ali Reza Saidi,Reza Bahaadini 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.84 No.4

For the first time, the higher-order shear and normal deformable plate theory (HOSNDPT) is used for the vibration and flutter analyses of the multilayer functionally graded graphene platelets reinforced composite (FG-GPLRC) plates under supersonic airflow. For modeling the supersonic airflow, the linear piston theory is adopted. In HOSNDPT, Legendre polynomials are used to approximate the components of the displacement field in the thickness direction. So, all stress and strain components are encountered. Either uniform or three kinds of non-uniform distribution of graphene platelets (GPLs) into polymer matrix are considered. The Young modulus of the FG-GPLRC plate is estimated by the modified Halpin-Tsai model, while the Poisson ratio and mass density are determined by the rule of mixtures. The Hamilton’s principle is used to obtain the governing equations of motion and the associated boundary conditions of the plate. For solving the plate’s equations of motion, the Galerkin approach is applied. A comparison for the natural frequencies obtained based on the present investigation and those of three-dimensional elasticity theory shows a very good agreement. The flutter boundaries for FG-GPLRC plates based on HOSNDPT are described and the effects of GPL distribution patterns, the geometrical parameters and the weight fraction of GPLs on the flutter frequencies and flutter aerodynamic pressure of the plate are studied in detail. The obtained results show that by increasing 0.5% of GPLs into polymer matrix, the flutter aerodynamic pressure increases approximately 117%, 145%, 166% and 196% for FG-O, FG-A, UD and FG-X distribution patterns, respectively.

Association of Benign Prostate Hyperplasia with Polymorphisms in VDR, CYP17, and SRD5A2 Genes among Lebanese Men

El Ezzi, Asmahan Ali,Zaidan, Wissam Rateeb,El-Saidi, Mohammed Ahmed,Al-Ahmadieh, Nabil,Mortenson, Jeffrey Benjamin,Kuddus, Ruhul Haque Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.3

Background: The aim of the study was to investigate any associations between benign prostate hyperplasia (BPH) and single nucleotide polymorphisms (SNPs) in the VDR gene (FokI, BsmI, ApaI and Taq${\alpha}$I loci) and the CYP17 gene (MspA1I locus), as well as TA repeat polymorphism in SRD5A2 gene among Lebanese men. Materials and Methods: DNA extracted from blood of 68 subjects with confirmed BPH and 79 age-matched controls was subjected to PCR/PCR-restriction fragment length polymorphism analysis. The odds ra=tio (OR) of having a genotype and the relative risk (RR) of developing BPH for having the genotype were calculated and the alleles were designated risk-bearing or protective. Results: Our data indicated that the A and B alleles of the VDR ApaI and BsmI SNPs were highly associated with increased risk of BPH (p=0.0168 and 0.0002, respectively). Moreover, 63% of the controls compared to 43% of the subjects with BPH were homozygous for none of the risk-bearing alleles (p=0.0123) whereas 60% of the controls and 28% of the subjects with BPH were homozygous for two or more protective alleles (p<0.0001). Conclusions: For the first time, our study demonstrated that ApaI and BsmI of the VDR gene are associated with risk of BPH among Lebanese men. Our study also indicated that overall polymorphism profile of all the genes involved in prostate physiology could be a better predictor of BPH risk.

On simple estimation technique for the reliability of exponential lifetime model

Al-Hemyari, Z.A.,Al-Saidy, Obaid M.,Al-Ali, A.R. The Korean Reliability Society 2013 International Journal of Reliability and Applicati Vol.14 No.2

Exponential distribution plays a key role in engineering reliability and its applications. The exponential failure model has been studied for years. This article introduces two new preliminary test estimators for the reliability function (R(t)) in complete and censored samples from the exponential model with the use of a prior estimation (${\theta}_0$) of the mean (${\theta}$). The proposed preliminary test estimators are studied and compared numerically with the existing estimators. Computer-intensive calculations for bias and relative efficiency show that for, different values of levels of significance and for varying constants involved in the proposed estimators, the proposed estimators are far better than classical and existing estimators.

Sulfur-Emission-Free Process of Molybdenum Carbide Synthesis by Lime-Enhanced Molybdenum Disulfide Reduction with Methane

Ghasemi, Samad,Abbasi, Mohammad Hasan,Saidi, Ali,Kim, Jae Yul,Lee, Jae Sung American Chemical Society 2011 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.50 No.23

<P>To investigate a sulfur-emission-free process of molybdenum carbide synthesis from molybdenite, the reaction pathways of MoS<SUB>2</SUB> reduction with methane in the presence of lime (CaO) have been studied. A mixture of MoS<SUB>2</SUB> + 2CaO was reduced isothermally with CH<SUB>4</SUB> in a microreactor, and the composition of effluent gases and the reduced fraction were determined as a function of reaction time. Analysis of the solid phase at different reaction times at 800 °C showed the formation of CaMoO<SUB>4</SUB> as an intermediate phase. Hence, the reaction pathways proposed for reduction of MoS<SUB>2</SUB> + CaO with CH<SUB>4</SUB> involves the direct reduction of MoS<SUB>2</SUB> with CH<SUB>4</SUB> to form Mo<SUB>2</SUB>C and sulfur-containing gases. The sulfur-containing gases are captured by CaO to form CaS, CO(g), CO<SUB>2</SUB>(g), and H<SUB>2</SUB>O(g). The unreacted MoS<SUB>2</SUB> is oxidized by CO<SUB>2</SUB>(g) and H<SUB>2</SUB>O(g) to form MoO<SUB>3</SUB>(g), which reacted with CaO to form CaMoO<SUB>4</SUB> on CaO particles. Finally, CaMoO<SUB>4</SUB> and remaining MoS<SUB>2</SUB> are further reduced with CH<SUB>4</SUB>. Characterization of solid samples was carried out by XRD, CHN, and FE-SEM equipped with EDS, providing results consistent with the proposed reaction pathways. Carbon content of solid sample increased with reduction time, and in fully reduced sample at 800 °C it was well above the stoichiometric amount indicating considerable excess carbon deposition due to CH<SUB>4</SUB> cracking.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/iecred/2011/iecred.2011.50.issue-23/ie201860h/production/images/medium/ie-2011-01860h_0010.gif'></P>

On simple estimation technique for the reliability of exponential lifetime model

Z. A. Al-Hemyari,Obaid M. Al-Saidy,A. R. Al-Ali 한국신뢰성학회 2013 International Journal of Reliability and Applicati Vol.14 No.2

Exponential distribution plays a key role in engineering reliability and its applications. The exponential failure model has been studied for years. This article introduces two new preliminary test estimators for the reliability function ( R(t) ) in complete and censored samples from the exponential model with the use of a prior estimation ( θ0 ) of the mean ( θ ) . The proposed preliminary test estimators are studied and compared numerically with the existing estimators. Computer-intensive calculations for bias and relative efficiency show that for, different values of levels of significance and for varying constants involved in the proposed estimators, the proposed estimators are far better than classical and existing estimators.