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Toward understanding the microstructure characteristics,phase selection and magnetic properties of laser additive manufactured Nd-Fe-B permanent magnets

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International Journal of Extreme manufacturing 2024年第1期6卷 277-294页

作者： Bo Yao Nan Kang Xiangyu Li Dou Li mohamed el mansori Jing Chen Haiou Yang Hua Tan Xin Lin State Key Laboratory of Solidiffcation Processing Northwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China Arts et metiers Institute of Technology MSMPHESAM UniversitéF-51006 Chˆalons-en-ChampagneFrance Key Laboratory of metal High Performance Additive manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China Texas A&m Engineering Experiment Station Institute for Manufacturing SystemsCollege StationTX 77843United States of America

Nd-Fe-B permanent magnets play a crucial role in energy conversion and electronic *** essential magnetic properties of Nd-Fe-B magnets,particularly coercivity and remanent magnetization,are significantly infuenced by the phase characteristics and *** this work,Nd-Fe-B magnets were manufactured using vacuum induction melting(VIm),laser directed energy deposition(LDED)and laser powder bed fusion(LPBF)*** evolution and phase selection of Nd-Fe-B magnets were then clarified in *** results indicated that the solidification velocity(V)and cooling rate(R)are key factors in the phase *** terms of the VIm-casting Nd-Fe-B magnet,a large volume fraction of theα-Fe soft magnetic phase(39.7 vol.%)and Nd2Fe17Bxmetastable phase(34.7 vol.%)areformed due to the low R(2.3×10-1?C s-1),whereas only a minor fraction of the Nd2Fe14B hard magnetic phase(5.15 vol.%)is *** the LDED-processed Nd-Fe-B deposit,although the Nd2Fe14B hard magnetic phase also had a low value(3.4 vol.%)as the values of V(m s-1)and R(5.06×103?C s-1)increased,part of theα-Fe soft magnetic phase(31.7vol.%)is suppressed,and a higher volume of Nd2Fe17Bxmetastable phases(47.5 vol.%)*** a result,both the VIm-casting and LDED-processed Nd-Fe-B deposits exhibited poor magnetic *** contrast,employing the high values of V(>10-2m s-1)and R(1.45×106?C s-1)in the LPBF process resulted in the substantial formation of the Nd2Fe14B hard magnetic phase(55.8 vol.%)directly from the liquid,while theα-Fe soft magnetic phase and Nd2Fe17Bxmetastable phase precipitation are suppressed in the LPBF-processed Nd-Fe-B ***,crystallographic texture analysis reveals that the LPBF-processedNd-Fe-B magnets exhibit isotropic magnetic ***,the LPBF-processed Nd-Fe-B deposit,exhibiting a coercivity of 656 k A m-1,remanence of 0.79 T and maximum energy product of 71.5 k J m-3,achieved an acceptable magnetic perfor

关键词： laser additive manufacturing(LAm) Nd-Fe-B permanent magnets numerical simulation microstructure magnetic properties

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electrochemical anodization of cast titanium alloys in oxalic acid for biomedical applications

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Frontiers of Chemical Science and Engineering 2024年第1期18卷 13-24页

作者： Engie m.Safwat Soha A.Abdel-Gawad madiha A.Shoeib Shimaa el-Hadad Restorative and Dental materials Department National Research CentreGiza 12622Egypt Chemistry Department Faculty of ScienceCairo UniversityGiza 12613Egypt Central metallurgical Research and Development Institute Helwan 11421Egypt

Titanium and its alloys have numerous biomedical applications thanks to the composition and morphology of their oxide *** this study,the colorful oxide films were formed by anodizing cast Ti-6Al-4V and Ti-6Al-7Nb alloys in a 10%oxalic acid solution for 30 s at different voltages(20–80 V)of a direct current power *** force microscopy was used as an accurate tool to measure the surface roughness of thin films on the nanometer *** electron microscopy and X-ray diffraction were performed to analyze surface morphology and phase *** to the results,the produced titanium oxide layer showed high surface roughness,which increased with increasing anodizing *** impact of anodizing voltages on the color and roughness of anodized layers was *** corrosion resistance of the anodized samples was studied in simulated body fluid at pH 7.4 and a temperature of 37℃ utilizing electrochemical impedance spectroscopy and the potentiodynamic polarization *** anodized samples for both alloys at 40 V were at the optimal voltage,leading to a TiO_(2) layer formation with the best compromise between oxide thickness and corrosion ***,findings showed that TiO_(2) films produced on Ti-6Al-7Nb alloys had superior surface roughness properties compared to those of Ti-6Al-4V alloys,making them more appropriate for orthopedic *** the obtained data and the fruitful discussion,it was found that the utilized procedure is simple,low-cost,and ***,anodization in 10%oxalic acid proved a viable alternative for the surface finishing of titanium alloys for biomedical applications.

关键词： DC anodization Ti-6Al-4V alloy Ti-6Al-7Nballoy oxidefilm corrosion

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Natural ray-emitting radionuclides in Egyptian cement

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Nuclear Science and Techniques 2005年第6期16卷 376-380页

作者： a.m.el-ARABI A.ABBADY A.H. el-KAmel A. NOSIER A. mOUSTAFA Physics Deptartment Faculty of Science Qena South Valley University Egypt Physics Deptartment Faculty of Science Assiut University Egypt Physics Deptartment Faculty of Science El-Azhar University Egypt

Samples of cement manufactured in Egypt and the raw materials have been analyzed usinggamma-spectroscopy, in order to determine the concentration of natural radionuclides and associated radiologicalhazard. The mean of specific activity due to radionuclides of 226 Ra, 232 Th and 40 K was found to be (20±4), (11± 2),(320±18) (gypsum), (41±8), (27±5), (410±27) (clay), (58±11), (18±3), (321±20) (iron ore) and (37.6±6), (11.8±3),(178.6±15) Bq?kg -1 (Portland cement), respectively. 40 K concentration could not be detected in slag, limestone, sul-phateresistant cement (S.R.C.), clinker and white cement, while the mean specific activities of 226 Ra and 232 Th are(239±16), (48.7±7); (31.5±5), (10±2); (47±7), (20±5); (23±5), (10.4±3) and (23±5), (11±3) Bq?kg -1 , respectively. Theactivities (concentrations) are in the same range as the data released in other countries. The calculated radiation haz-ardparameters for all the samples are still lower than the acceptable values in Egypt and other countries.

关键词： γ射线放射性核埃及伽马射线

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Influence of Sanitization Process on maintaining Sweet Potato Quality for Export

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Journal of Agricultural Science and Technology(A) 2024年第1期14卷 31-37页

作者： Saneya.m.el Neshawy Tharwa.m.elkholi Salah H.Hegazy Department of Post-harvest Diseases Plant Pathology Research InstituteAgricultural Research Center(ARC)Giza 12619Egypt Central Administration for medical Services Ministry of AgricultureDokii 12611Egypt General manager of AgroFood Company Limited Dokii 12611Egypt

The whole cold-chain for exporting sweet potato(native variety“Abees”),to foreign market included immediate curing operation directly after harvest helped in healing skin texture,however,in order to reduce postharvest soft rot(Rhizopus stolonifer)incidence following trimming,and washing,ultraviolet light(UV-C)treatment was used as a main sanitizer for eliminating the soft *** of the roots to UV-C(254 nm)was applied in a UV-C room on freshly harvested and cured sweet potato while rolling up on a movable line at 20 cm distance for 1,2,and 3 *** combining UV-C treatment with chlorine(200 ppm)on roots,marked and significant reduction of the total microbial load and Rhizopus potential was achieved on root surfaces respectively compared with chlorine *** also reduced soft rot percentage to almost 0%*** 3 months of cold-storage,quality assessment of sweet potato showed that root characteristics were markedly *** ability of UV-C light to induce phenylalanine ammonia lyase(PAL)enzyme activity in root tissue and maintain the activities of peroxidase and polyphenol oxidase,however with slight increase,was ***-C caused an increase of phenol content in sweet potato tissue that made an activation of defense reaction against the rot causal *** the exposure time to UV-C light increased,a higher content of phenols ***,UV-C application caused decrease in sugar content of root tissue that is flavored by soft rot-causal pathogen.

关键词： Sweet potato(Ipomoea batatas) soft rot Rhizopus stolonifer UV-C light cold storage microbial load

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Extended Deep Learning Algorithm for Improved Brain Tumor Diagnosis System

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Intelligent Automation & Soft Computing 2024年第1期39卷 33-55页

作者： m.Adimoolam K.maithili N.m.Balamurugan R.Rajkumar S.Leelavathy Raju Kannadasan mohd Anul Haq Ilyas Khan elSayed m.Tag el Din Arfat Ahmad Khan Department of Computer Engineering Government Polytechnic CollegeSevvapetTiruvallurTamil Nadu602025India Department of Computer Science and Engineering KG Reddy College of Engineering and TechnologyHyderabadTelangana500075India Department of Computer Science and Engineering Sri Venkateswara College of EngineeringSriperumbudurChennai602117India Department of Computer Science and Engineering Annamalai UniversityChidambaramTamil Nadu608002India Department of Computer Science and Engineering Aarupadai Veedu Institute of TechnologyVinayaka Mission Research FoundationPaiyanurTamil Nadu603104India Department of electrical and electronics Engineering Sri Venkateswara College of EngineeringSriperumbudur602117India Department of Computer Science College of Computer and Information SciencesMajmaah UniversityAl-Majmaah11952Saudi Arabia Department of mathematics College of Science Al-ZulfiMajmaah UniversityAl-Majmaah11952Saudi Arabia electrical Engineering Department Faculty of Engineering&TechnologyFuture University in EgyptNew Cairo11835Egypt Department of Computer Science College of ComputingKhon Kaen UniversityKhon Kaen40002Thailand

At present,the prediction of brain tumors is performed using machine Learning(mL)and Deep Learning(DL)*** various mL and DL algorithms are adapted to predict brain tumors to some range,some concerns still need enhancement,particularly accuracy,sensitivity,false positive and false negative,to improve the brain tumor prediction system ***,this work proposed an Extended Deep Learning Algorithm(EDLA)to measure performance parameters such as accuracy,sensitivity,and false positive and false negative *** addition,these iterated measures were analyzed by comparing the EDLA method with the Convolutional Neural Network(CNN)way further using the SPSS tool,and respective graphical illustrations were *** results were that the mean performance measures for the proposed EDLA algorithm were calculated,and those measured were accuracy(97.665%),sensitivity(97.939%),false positive(3.012%),and false negative(3.182%)for ten *** in the case of the CNN,the algorithm means accuracy gained was 94.287%,mean sensitivity 95.612%,mean false positive 5.328%,and mean false negative 4.756%.These results show that the proposed EDLA method has outperformed existing algorithms,including CNN,and ensures symmetrically improved *** EDLA algorithm introduces novelty concerning its performance and particular activation *** proposed method will be utilized effectively in brain tumor detection in a precise and accurate *** algorithm would apply to brain tumor diagnosis and be involved in various medical diagnoses *** the quantity of dataset records is enormous,then themethod’s computation power has to be updated.

关键词： Brain tumor extended deep learning algorithm convolution neural network tumor detection deep learning

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The germline genetics of mild-to-moderate penetrance:An intriguing role of PRAmE in multiple carcinogenesis

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Genes & Diseases 2024年第3期11卷 7-10页

作者： Diaddin Hamdan Van Tai Nguyen Justine Paris Christophe Leboeuf morad el Bouchtaoui marc Espie Anne Janin Geraldine Falgarone melanie Di Benedetto Guithem Bousquet Universite de Paris Cite INSERMUMR_S942MASCOTParis F-75006France Hopital La Porte Verte Versailles F-78004France National Cancer Hospital Cancer Research and Clinical Trials CenterHaNoi100000VietNam AP-HP-Hopital Saint Louis Centre de Maladies du SeinParisF-75010France Universite Sorbonne Paris Nord Bobigny F-93000France AP-HP-Hopital Avicenne Unite de Medecine AmbulatoireBobigny F-93000France

Germline genetics of high penetrance such as BRCA genes,mutations might be sufficient for carcinogenesis,but this only explains fewer than 10%of *** assume that most cancers are the result of germline mutations of low to moderate penetrance,combined with acquired mutations due to external carcinogenic *** their accumulation over time,aging is associated with an increased risk of multiple cancer development in a given *** decades,germline genetics have been based on familial linkage studies enabling most high-penetrance genes to be *** recently,population-wide studies have led to the identification of considerable numbers of polymorphisms associated with cancer ***,most of them are of unknown functional value,thus limiting their translational application.

关键词： carcinogenesis BRCA linkage

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A new hydrophobic deep eutectic solvent composed of menthol and tris(2-ethylhexyl) phosphate for solvent bar microextraction of parabens from biological fluids

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Emerging Contaminants 2024年第2期10卷 135-145页

作者： Nabil N.AL-Hashimi Husam Abed Alfattah Khaleel I.Assaf Asma A.Fakhoury Saja H.Hamed Amjad H.el-Sheikh Khairi m.Fahelelbom The Hashemite University Faculty of Pharmaceutical SciencesDepartment of Pharmaceutical ChemistryP.O.Box 330127Zarqa13133Jordan The Hashemite University Faculty of ScienceDepartment of ChemistryP.O.Box 150459Zarqa13115Jordan Al-Balqa Applied University Faculty of ScienceDepartment of Chemistry19117 Al-SaltJordan The Hashemite University Faculty of Pharmaceutical SciencesDepartment of Pharmaceutics and Pharmaceutical TechnologyP.O.Box 330127Zarqa13133Jordan Al Ain University College of PharmacyDepartment of Pharmaceutical SciencesP.O.Box 64141Al AinAl AinUnited Arab Emirates

Parabens are antimicrobial preservatives with extensive applications in cosmetics,toiletries,pharmaceuticals,and *** the legitimate concerns relating to their potential to disrupt multiple endocrine functions,it becomes imperative to prioritize the development of innovative bioanalytical techniques for effectively monitoring their presence in biological *** this study,an efficient solvent bar microextraction(SBmE)was established,utilizing new hydrophobic deep eutectic solvents(DEs)to determine methylparaben and propylparaben in urine and plasma *** DEs comprising menthol and tris(2-ethylhexyl)phosphate(m-TEHP)at various molar ratios were synthesized for the first time to enhance the extraction capacity and promote the eco-friendliness of the DE used as an extraction ***-transform infrared(FT-IR)and proton nuclear magnetic resonance(1H NmR)spectroscopies were employed to confirm and investigate the properties of the successful synthesis(m-TEHP)DE at a molar ratio of 1:*** synthesized DE exhibits low microbial toxicity and can be considered an eco-friendly solvent for ***,quantum-chemical calculations were utilized to predict synthesized DE's structure and interaction energy with selected *** influential operational factors of DE-SBmE on the extraction efficiency(EE%)of both parabens were evaluated using response surface methodology based on central composite design,and a total of 30 extraction tests were conducted to determine the optimal *** optimized DE-SBmE,in combination with HPLC-DAD,exhibited low detection limits(0.54–0.91μg L^(−1)),excellent linearity(R^(2)≥0.9993),precise results(RSDs≤7.6%),satisfactory recoveries(92–97%)and negligible matrix ***,it had remarkable effectiveness and applicability in determining selected parabens in real urine and plasma samples.

关键词： Hydrophobic deep eutectic solvent Solvent bar microextraction Parabens Response surface methodology and central composite design HPLC-DAD Urine and plasma

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Effect of Ca addition on modification of primary mg_(2)Si,hardness and wear behavior in mg-Si hypereutectic alloys

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Journal of magnesium and Alloys 2014年第3期2卷 230-238页

作者： m.E.moussa m.A.Waly a.m.el-Sheikh Department of manufacturing Technology Laboratory of FoundryCentral Metallurgical Research and Development Institute(CMRDI)P.O.87HalwanEgypt Department of mining Petroleum and Metallurgical EngineeringFaculty of EngineeringCairo UniversityP.O.12613GizaEgypt

The effect of Ca addition on modification of primary mg_(2)Si,hardness and wear behavior in mg-5 wt.%Si hypereutectic alloy has been *** results showed clearly that without Ca addition,most of primary mg_(2)Si appeared as coarse dendritic morphology with average size of about 215μ*** the addition of 0.1 wt.%Ca,the average size of primary mg_(2)Si decreased to about 98μm,but their morphologies did not significantly *** the addition level of Ca increased to 0.3 wt.%,the average size of primary mg_(2)Si decreased significantly to about 50μm and their morphologies changed to polyhedral ***,with further increasing Ca addition to 0.6 wt.%and 1 wt.%,some needle-like and blocky CamgSi particles formed and the average size of primary mg_(2)Si increased slightly,which could described as *** present work showed that the optimal modification effect could be obtained when the Ca content in the investigated alloy reached 0.3 wt.%.The modification mechanism may be referred mainly due to poisoning effect resulting from the segregation of Ca atoms at the growth front of the mg_(2)Si and the adsorption effect of some Ca atoms in the mg_(2)Si crystal growth *** 0.3 wt.%Ca-added alloy has the highest hardness value and the best wear resistance among all other *** excessive Ca addition resulted in the formation of some needle-like and blocky CamgSi particles,which was detrimental to hardness and wear behavior of the 0.6 wt.%and 1 wt.%Ca-added *** wear mechanism of investigated alloys is a mild abrasive oxidative wear with little adhesion.

关键词： mg-Si alloys modification Ca addition Hardness Wear

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Petrology, geochemistry, radioactivity, and m–W type rare earth element tetrads of el Sela altered granites, south eastern desert,Egypt

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Acta Geochimica 2019年第1期38卷 95-119页

作者： a.m.el mezayen m.A.Heikal m.G.el-Feky H.A.Shahin I.K.Abu Zeid S.R.Lasheen Geology Department Faculty of Science Al Azhar University Nuclear material Authority

The southern part of the Eastern Desert of Egypt—about 30 km southwest of Abu-Ramad city—is mainly covered by ophiolitic rocks(Sul Hamed), island arc assemblage, younger granites(muscovite granites of Qash Amer and two mica granites of el Sela), and various acidic and basic dikes. Field, petrological, and geochemical studies indicate that the el Sela shear zone has been subject to hydrothermal and supergene alteration such as kaolinization, albitization, sericitization, and hematitization. It is invaded by quartz ENE–WSW veins associated with hydrothermal alteration accompanied by radioactive mineralization. The investigated younger granitic rocks had very low contents of compatible elements, such as Cr, Ni,and Co; and high contents of incompatible elements, such as Zr, and large ion lithophiles, such as Sr, especially in the el Sela shear zone. major oxide and trace element analyses revealed calc-alkaline affinity and peraluminous *** highly differentiated granitic rocks' lower Zr/Hf and higher Y/Ho than the normal ratio are consistent with hydrothermal alteration. most samples had rare earth element(REE)-patterns with an m-type tetrad effect in the first and fourth segments and a W-type tetrad in the third segment. The average ∑REE in the studied granites was lower than the world granite average; the ratio of light to heavy REEs greater. The main radioactive, uranium-bearing, and uraniferous Fe and mn minerals are uranothorite,autunite, uranophane and autunite as compounds, kasolite,columbite, xenotime, uranophane-bearing zircon and jarosite, silver-bearing pyrite, hematite, and autunite-bearing pyrolusite.

关键词： Geochemistry REE-tetrad effect Radioactive minerals Radiometric measurements Qash Amer el Sela

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Changing dietary n-6:n-3 ratio using different oil sources affects performance,behavior,cytokines mRNA expression and meat fatty acid profile of broiler chickens

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Animal Nutrition 2018年第1期4卷 -页

作者： Doaa Ibrahim Rania el-Sayed Safaa I.Khater Enas N.Said Shefaa a.m.el-mandrawy Department of Nutrition and Clinical Nutrition Faculty of Veterinary MedicineZagazig University Department of Biochemistry Faculty of Veterinary MedicineZagazig University Department of Veterinary Public Health Faculty of Veterinary MedicineZagazig University Department of Clinical Pathology Faculty of Veterinary MedicineZagazig University

Typical formulated broiler diets are deficient in n-3 poly-unsaturated fatty acids(PUFA) due to widening n-6:n-3 PUFA ratio which could greatly affect performance,immune system of birds and,more importantly,meat *** study was conducted to evaluate the effect of modifying dietary n-6:n-3 PUFA ratio from plant and animal oil sources on performance,behavior,cytokine m RNA expression,antioxidative status and meat fatty acid profile of broiler ***(n=420) were fed 7 diets enriched with different dietary oil sources and ratios as follows: sunflower oil in control diet(C); fish oil(FO); 1:1 ratio of sunflower oil to FO(C1 FO1); 3:1 ratio of sunflower oil to fish oil(C3 FO1); linseed oil(LO); 1:1 ratio of sunflower oil to linseed oil(C1 LO1); 3:1 ratio of sunflower oil to linseed oil(C3 LO1),resulting in dietary n-6:n-3 ratios of approximately 40:1,1.5:1,4:1,8:1,1:1,2.5:1 and 5:1,*** best final body weight,feed conversion ratio as well as protein efficiency ratio of broilers were recorded in the C1 FO1 and C1 LO1 *** with the control group,the dressing percentage and breast and thigh yield were highest in the C1 FO1 and C1 LO1 *** the dietary n-6:n-3 ratio increased(P meat contents of eicosapentaenoic acid and docosahexaenoic acid increased(P m FO and LO clearly decreased(P m total cholesterol,triglycerides and very low-density lipoproteins and enhanced antioxidative *** feeding frequency was decreased(P mpared to plant oil,to broiler diets enhanced the relative m RNA expression of interferon gamma,interleukin-1 beta,interleukin-2 and

关键词： Broiler n-6:n-3 PUFA ratio Performance Antioxidant status meat Immunity

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