http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hydrothermal extraction of a-Fe2O3 nanocrystallite from hematite ore
N.M. Khalil,M.M.S. Wahsh,Elhadi E. Saad 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
a-Fe2O3 nanocrystallite has been extracted from its ore raw material by using simple chemical method. Mineralogical and chemical compositions of the raw material were investigated using X-ray diffraction(XRD), infrared (IR) and X-ray fluorescence (XRF) techniques. Also, thermal behavior includingthermogravimetry (TG) and differential thermal analysis (DTA) of the raw material was examined. Scherrer’s equation and XRD data were used to determinate the crystallite size and phase composition ofthe extracted hematite nanocrystallite. Morphology of the extracted a-Fe2O3 particles was tested usingscanning electron microscope (SEM). About 96.80% of the total iron oxide present in the rawmaterial sample was extracted as a-Fe2O3 withthe average crystallite size less than 100 nm. The extracted a-Fe2O3 nanocrystallite is considered as apromise material for great technological applications as ceramic humidity sensors, catalysts, pigments,ferrofluid, recording systems, etc.
N.M. Khalil,E.M. Hassan,M.M.E. Shakdofa,M. Farahat 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
This study aims at benefit from barely husk ash (BHA), rice husk ash (RHA), and coal fly ash (CFA) as a replacement of ordinary Portland cement (OPC) to eliminate the problems associated with cement industry involving energy consuming and air pollution. Three series of cement mixes were prepared from OPC with different contents (0–30 wt.%) of each additive. Different cementing and mechanical properties of the prepared mixes were tested according to the international standard specifications. It was concluded that OPC blended with 15–20 wt.% of BHA, RHA, or CFA show outstanding cementing properties.
N.M. Khalil,M.M.S. Wahsh,Amany Gaber 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.5
Vitreous ceramic tiles were produced from clay, quartz and albite mixtures fired at 1150 oC. These ceramic tiles were classifiedaccording to the ISO standard. The effect of fluxes additions on the technological properties of ceramic tiles has been studied. The sintering behavior (linear shrinkage, water absorption, apparent porosity and bulk density) of the prepared ceramicbodies was followed. Phase compositions and microstructure were characterized by X-ray diffraction (XRD) and scanningelectron microscope (SEM) attached with an EDAX unit. The densification parameters and hence mechanical properties ofthe samples were enhanced with increasing of albite content up to 40 wt. % due to liquid phase sintering mechanism. However,higher amount of fluxes above the vitrification range (> 40 wt.%) results in a noticeable decrease in the sintering andmechanical properties.
Exploitation of the ceramic wastes for the extraction of nano aluminum oxide powder
N.M. Khalil 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
This work aims at exploitation of the ceramic waste material for alumina extraction through mixing with KHSO4 as a fluxing agent. The chemical composition of the ceramic waste sample as well as the extracted alumina sample was investigated using X-ray fluorescence (XRF). The mineralogical composition and crystal size of the extracted alumina sample was investigated using X-ray diffraction (XRD). Transmission electron microscope (TEM) was used to study the grain size of the extracted alumina particles. Highly pure (99.37%) nano alumina particles (<50 nm) could be extracted from the ceramic waste sample. The efficiency of alumina extraction is 99.06%.
Motlak, M.,Barakat, N.A.M.,El-Deen, A.G.,Hamza, A.M.,Obaid, M.,Yang, O.B.,Akhtar, M.S.,Khalil, K.A. Elsevier 2015 Applied Catalysis A Vol.501 No.-
NiCu bimetallic nanoparticle-decorated graphene was prepared by hydrothermal treatment to be utilized as an efficient and alternative Pt-free counter electrode (CE) for dye-sensitized solar cells (DSSCs). The results indicated that the performance of the introduced modified graphene as CE strongly depends on the composition of the metallic nanoparticles. Typically, Ni-, Ni<SUB>0.25</SUB>Cu<SUB>0.75</SUB>-, Ni<SUB>0.6</SUB>Cu<SUB>0.4</SUB>- and Ni<SUB>0.75</SUB>Cu<SUB>0.25</SUB>-decorated graphene were synthesized. Investigation of the electrochemical characteristics indicated that the graphene decorated by Ni<SUB>0.75</SUB>Cu<SUB>0.25</SUB> nanoparticles shows the highest catalytic activity and conductivity compared to the other prepared formulations as well as pristine graphene. In DSSC, Ni<SUB>0.75</SUB>Cu<SUB>0.25</SUB> nanoparticle-decorated graphene can remarkably improve the catalytic activity toward triiodide reduction and lower the resistance at the electrolyte-CE interface. Accordingly, the obtained energy conversion efficiencies were 1.72%, 2.39%, 1.24%, 2.87% and 5.1% for pristine, Ni-, Ni<SUB>0.25</SUB>Cu<SUB>0.75</SUB>-, Ni<SUB>0.6</SUB>Cu<SUB>0.4</SUB>- and Ni<SUB>0.75</SUB>Cu<SUB>0.25</SUB>-decorated graphene, respectively. The obtained efficiency for Ni<SUB>0.75</SUB>Cu<SUB>0.25</SUB>-decorated graphene is comparable with Pt-based DSSC fabricated by the same procedure (5.9%) which recommends exploiting the introduced modified graphene as efficient and cost-effective CE for the large-scale fabrication of photovoltaic devices. The catalytic performance of the best formulation was examined toward methanol electrooxidation; the results indicated effective and stable electrocatalytic activity.
Ali Akbarpour,M. S. Parkhomenko,A. M. Khalil,V. V. Cheverikin,N. Yu. Tabachkova,E. N. Zanaeva,A. I. Bazlov 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.9
This work studied the influence of thermomechanical treatment on the mechanical properties, structure, and crystallizationof the Zr65.5Ni16Cu8.5Al10metallic glass alloy. It established that thermomechanical treatment significantly affects themechanical properties of the alloy while maintaining its amorphous structure due to the formation of regions of chemicalinhomogeneity in the amorphous matrix. In addition, shear deformation affects the initial crystallization of the alloy. As aresult, there is a transition from one-stage crystallization to two-stage crystallization with a strain increase.
Abuhaliema, Ali M,Yousef, Al-Motassem F,El-Madany, Nirmeen N,Bulatova, Nailya R,Awwad, Nemah M,Yousef, Muhammad A,Al Majdalawi, Khalil Z Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.1
Background: Breast cancer is the leading cause of cancer death among women and the second in humans worldwide. Many published studies have suggested an association between MDR1 polymorphisms and breast cancer risk. Our aim was to study the association between genetic polymorphism of MDR1 at three sites (C3435T, G2677A/T, and C1236T) and their haplotype and the risk of breast cancer in Jordanian females. Materials and Methods: A case-control study involving 150 breast cancer cases and 150 controls was conducted. Controls were age-matched to cases. The polymerase chain reaction/restriction fragment length polymorphism (PCR-RFLP) technique and sequencing were performed to analyse genotypes. Results: The distribution of MDR1 C3435T genotypes differed between cases and controls [cases, CC 45.3%, CT 41.3%, and TT 13.3%; controls, CC 13.4%, CT 43.3%, and TT 30.2%, p < 0.001]. Similarly, the distribution of G2677A/T significantly differed [cases, GG 43.1 %, GT+GA 50.9% and AA+TT 6%; controls, GG 29.6 %, GT+GA 50.9%, and AA+TT 19.4%, p = 0.004]. On the other hand, genotype and allelotype distribution of C1236T was not statistically different between cases and controls (p=0.56 and 0.26, respectively). The CGC haplotype increased the risk to breast cancer by 2.5-fold compared to others, while TGC and TTC haplotypes carried 2.5- and 5-fold lower risk of breast cancer, respectively. Conclusions: Genetic polymorphisms of MDR1 C3435T and G2677A/T, but not C1236T, are associated with increased risk of breast cancer. In addition, CGC, TGC and TTC haplotypes have different impacts on the risk of breast cancer. Future, larger studies are needed to validate these findings.
Dynamic behavior of TLP's supporting 5-MW wind turbines under multi-directional waves
Abou-Rayan, Ashraf M.,Khalil, Nader N.,Afify, Mohamed S. Techno-Press 2016 Ocean systems engineering Vol.6 No.2
Over recent years the offshore wind turbines are becoming more feasible solution to the energy problem, which is crucial for Egypt. In this article a three floating support structure, tension leg platform types (TLP), for 5-MW wind turbine have been considered. The dynamic behavior of a triangular, square, and pentagon TLP configurations under multi-directional regular and random waves have been investigated. The environmental loads have been considered according to the Egyptian Metrological Authority records in northern Red sea zone. The dynamic analysis were carried out using ANSYS-AQWA a finite element analysis software, FAST a wind turbine dynamic software, and MATLAB software. Investigation results give a better understanding of dynamical behavior and stability of the floating wind turbines. Results include time history, Power Spectrum densities (PSD's), and plan stability for all configurations.