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Effect of Si-addition as a grain refiner on microstructure and properties of Ti-6Al-4V Alloy

Transactions of Nonferrous Metals Society of China 2013年第7期23卷 1863-1874页

作者： Khaled M.IBRAHIM Abdel Hamied HUSSEIN mohamed abdelkawy Central Metallurgical R&D Institute CMRDICairoEgypt Cairo University GizaEgypt

Two different Ti alloys were cast in a graphite mould using vacuum induction skull melting furnace. The first alloy was Ti-6Al-4V and the second was Ti-6Al-4V 0.5Si. Silicon as a grain refiner was added into Ti-6Al-4V alloy, and the effects of Si-addition on the microstructure and properties of the as-cast and swaged alloys were investigated. Hot swaging at 900 °C was performed on the cast samples and then two different thermal treatments were applied. The first treatment was done by heating the swaged samples at 1050 °C to produce fine lamella structure, while the second treatment was carried out at 1050 °C and then decreased the temperature to 800 °C for getting coarse lamella structure. An addition of 0.5% Si to Ti-6Al-4V alloy decreased the grain size of the as-cast sample from 627 to 337 μm. There was an increase in ultimate tensile strength of about 25 MPa for the as-cast Ti-6Al-4V 0.5Si alloy compared to Ti-6Al-4V due to the refinement effect caused by Si addition. A maximum ultimate tensile strength of 1380 MPa and a minimum corrosion rate （1.35×10 6 mm/a in Hank’s solution and 5.78×10 4 mm/a in NaCl solution） were reported for the heat treated fine lamella structure of Ti-6Al-4V 0.5Si alloy. The wear rate was decreased to about 50% by adding 0.5% Si at low sliding speeds and to about 73% at high sliding speeds.

关键词： Ti-6Al-4V alloy silicon casting grain refinement heat treatment wear

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Numerical Computational Heuristic Through Morlet Wavelet Neural Network for Solving the Dynamics of Nonlinear SITR COVID-19

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Computer Modeling in Engineering & Sciences 2022年第5期131卷 763-785页

作者： Zulqurnain Sabir Abeer S.Alnahdi Mdi Begum Jeelani mohamed A.abdelkawy Muhammad Asif Zahoor Raja Dumitru Baleanu Muhammad Mubashar Hussain Department of Mathematics Hazara UniversityMansehraPakistan Department of Mathematics and Statistics Faculty of ScienceImam Mohammad Ibn Saud Islamic University(IMSIU)RiyadhSaudi Arabia Department of Mathematics Faculty of ScienceBeni-Suef UniversityBeni-SuefEgypt Future Technology Research Center National Yunlin University of Science and TechnologyYunlinTaiwan Department of Mathematics Cankaya UniversityAnkaraTurkey Institute of Space Sciences Magurele-BucharestRomania Department of Mathematics University of PunjabJhelum CampusJhelumPakistan

The present investigations are associated with designing Morlet wavelet neural network(MWNN)for solving a class of susceptible,infected,treatment and recovered(SITR)fractal systems of COVID-19 propagation and *** structure of an error function is accessible using the SITR differential form and its initial *** optimization is performed using the MWNN together with the global as well as local search heuristics of genetic algorithm(GA)and active-set algorithm(ASA),i.e.,*** detail of each class of the SITR nonlinear COVID-19 system is also *** obtained outcomes of the SITR system are compared with the Runge-Kutta results to check the perfection of the designed *** statistical analysis is performed using different measures for 30 independent runs as well as 15 variables to authenticate the consistency of the proposed *** plots of the absolute error,convergence analysis,histogram,performancemeasures,and boxplots are also provided to find the exactness,dependability and stability of the MWNN-GA-ASA.

关键词： Nonlinear SITR model morlet function artificial neural networks Runge-Kutta treatment genetic algorithm treatment active-set

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Validated stability indicating methods for determination of nitazoxanide in presence of its degradation products

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Journal of Pharmaceutical Analysis 2012年第2期2卷 105-116页

作者： Nouruddin W.Ali Samah Sayed Abbas Hala El-Sayed Zaazaa Maha mohamed Abdelrahman mohamed abdelkawy Analytical Chemistry Department Faculty of PharmacyBeni-Suef UniversityHussin El-Shafey StreetBeni-Suef CityEgypt Analytical Chemistry Department Faculty of PharmacyCairo UniversityKasr El-Aini Street11562CairoEgypt

Three sensitive,selective and reproducible stability-indicating methods are presented for determination of nitazoxanide (NTZ),a new anti-protozoal drug,in presence of its degradation *** A utilizes the first derivative of ratio spectra spectrophotometry by measurement of the amplitude at 364.4 nm using one of the degradation products as a *** B is a chemometric-assisted spectrophotometry,where principal component regression (PCR) and partial least squares (PLS) were *** two approaches were successfully applied to quantify NTZ in presence of degradation products using the information included in the absorption spectra in the range 260-360 *** C is based on the separation of NTZ from its degradation products followed by densitometric measurement of the bands at 254 *** separation was carried out on silica gel 60F 254,using chloroform-methanol-ammonia solution-glacial acetic acid (95:5:1:1 by volume,pH=5.80) as a developing *** methods are suitable as stability-indicating methods for the determination of NTZ in presence of its degradation products either in bulk powder or in pharmaceutical *** analysis of the results has been carried out revealing high accuracy and good precision.

关键词： Nitazoxanide Degradation Derivative spectrophotometry Chemometrics TLC-densitometry Stability-indicating methods

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新型液相色谱-荧光检测法测定药物剂型和人血浆中的他达拉非和盐酸达泊西汀(英文)

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色谱 2015年第7期33卷 765-770页

作者： MAHA Hegazy AMIRA Kessiba mohamed abdelkawy AHMED EMAD El Gindy Analytical Chemistry Department Faculty of PharmacyCairo University Pharmaceutical Chemistry Department Faculty of PharmacyMisr International University Pharmaceutical Chemistry Department Faculty of PharmacyFuture University

Tadalafil(TAD)and dapoxetine HCl(DAP)are recently co-formulated and both show native ***,a novel,accurate,specific and sensitive reversed-phase high performance liquid chromatographic method with fluorescence detection was developed and validated for their separation and quantitation in dosage form and human plasma using avanafil as an internal standard(IS).Separation was achieved using isocratic elution within 7.0 min on C18column and acetonitrile-0.15%triethylamine(40∶60,v/v;pH 4)as a mobile *** flow rate was 1.0 mL/min and the detection was time-programmed at 330,410 and 370 nm for TAD,DAP and IS,respectively,after excitation at 236 *** linear ranges from 0.01 to 30.00μg/mL for each drug with the limits of detection of 4.20 and 7.20 ng/mL for TAD and DAP,*** method was validated in accordance to the International Conference on Harmonization(ICH)guidelines and was successfully applied to spiked human plasma with mean recoveries of 98.17%and 98.83%for TAD and DAP respectively.

关键词： high performance liquid chromatography(HPLC) fluorescence detection tadalafil(TAD) dapoxetine HCl(DAP) dosage form human plasma

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