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Preparation of Fe-As alloys by mechanical alloying and vacuum hot-pressed sintering:microstructure evolution,mechanical properties,and mechanisms

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Rare Metals 2024年第8期43卷 3876-3892页

作者： Fei Chai Fei-Ping Zhao Zhan Hu Shi-Yi Wen ben-hammouda samia Ze-Lin Fu Xin-Ting Lai Yan-Jie Liang Xiao-Bo Min Li-Yuan Chai School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Institute of Environmental EngineeringCentral South UniversityChangsha 410083HunanChin State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Department of Building Civiland Environmental EngineeringConcordia UniversityMontreal H3G 1M8Canada

Arsenic materials have attracted great attention due to their unique ***,research concerning iron-arsenic(Fe-As) alloys is very scarce due to the volatility of As at low temperature and the high melting point of ***,a new Fe-As alloy was obtained by mechanical alloying(MA) followed by vacuum hot-pressed sintering(VHPS).Moreover,a systematic study was carried out on the microstructural evolution,phase composition,leaching toxicity of As,and physical and mechanical properties of Fe-As alloys with varying weight fractions of As(20%,25%,30%,35%,45%,55%,65%,and 75%).The results showed that pre-alloyed metallic powders(PAMPs) have a fine grain size and specific supersaturated solid solution after MA,which could effectively improve the mechanical properties of Fe-As alloys by VHPS.A high density(> 7.350 g·cm^(-3)),low toxicity,and excellent mechanical properties could be obtained for FeAs alloys sintered via VHPS by adding an appropriate amount of As,which is more valuable than commercial Fe-As *** Fe-25% As alloy with low toxicity and a relatively high density(7.635 g·cm^(-3)) provides an ultra-high compressive strength(1989.19 MPa),while the Fe-65% As alloy owns the maximum Vickers hardness(HVo.5 899.41).After leaching by the toxicity characteristic leaching procedure(TCLP),these alloys could still maintain good mechanical performance,and the strengthening mechanisms of Fe-As alloys before and after leaching were *** in the grain size,micro structure,and phase distribution induced significant differences in the compressive strength and hardness.

关键词： Mechanical alloying Vacuum hot-pressed sintering High-pressure Arsenic-iron alloys Mechanical properties

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Bayesian genetic analysis of milk yield in Tunisian Holstein dairy cattle population

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Open Journal of Genetics 2012年第2期2卷 103-108页

作者： Houcine Ilahi Mohamed ben hammouda Mohamed Houcine Othmane Centre Régional des Recherches Agricoles de Sidi Bouzid Sidi Bouzid Tunisia Institution de Recherche et de l’Enseignement Supérieur Agricoles (IRESA) Ministère de l’Agriculture et de l’environnement Tunis Tunisia Université de Carthage Institut Préparatoire aux Etudes d’Ingénieurs de Bizerte Zarzouna Tunisia

The genetic determinism of 305-d milk yield and its genetic parameters were investigated in Tunisian Holstein dairy cattle population through Bayesian segregation analyses using a Monte Carlo Markov Chains (MCMC) method. Data included 49,709 records of 305-d milk yield collected between 1996 and 2003 from 114 dairy herds. The postulated major gene was assumed to be additive biallelic locus with Mendelian transmission probabilities and priors used for variance components were uniform. Gibbs sampling was used to generate a chain of 500,000 samples, which were used to obtain posterior means of genetic parameters. Estimated marginal posterior means ± posterior standard deviations of variance components of milk yield were 402866.28 ± 23629.97, 271256.66 ± 34477.83, 68276.83 ± 233027.62 and 1098855.75 ± 10009.52 for polygenic variance (σ2u), permanent environmental variance (σ2ne), major gene variance (σ2G) and error variance (σ2e), respectively. The main finding of this paper showed the postulated major locus was not significant, since the 95% highest posterior density regions (HPDs95%) of most major gene parameters included 0, and particularly for the major gene variance. Estimated transmission probabilities for the 95% highest posterior density regions (HPDs95%) were overlapped. Genetic parameters of 305-d milk yield were very similar under both mixed inheritance and polygenic models. These results indicated that the genetic determinism of milk yield in Tunisian Holstein dairy cattle population is purely polygenic. Based on 50,000 Gibbs samples, heritability and repeatability estimates using polygenic model were h2 = 0.22 ± 0.012 and r = 0.38 ± 0.006, respectively.

关键词： Bayesian Analysis Segregation Major Gene Genetic Parameters Milk Yield Holstein Dairy Cattle

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Spinal intradural mature teratoma in an elderly patient

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Journal of Cancer Metastasis and Treatment 2015年第1期1卷 106-110页

作者： Atef ben Nsir Karim ben hammouda Imed ben Said Alia Zhani Kassar Nidhameddine Kchir Hafedh Jemel Department of Neurological Surgery Fattouma Bourguiba University HospitalUniversity of Medicine of MonastirMonastir 5000Tunisia Department of Neurological Surgery Tunisian National Institute of NeurologyUniversity of Medicine of Tunis El ManarTunis 1007Tunisia Department of Pathology La Rabta University HospitalUniversity of Medicine Tunis El ManarTunis 1007Tunisia.

Spinal intradural mature teratomas are rarely encountered in *** this report,one of the oldest patients ever reported to harbor an intradural mature teratoma of the conus medullaris is presented,and the relevant literature concerning the teratoma’s origin,clinical presentation,radiological features,and treatment modalities is reviewed.A previously healthy 70-year-old woman presented with a 2-month history of left *** neurological examination was normal and the magnetic resonance imaging of the thoracolumbar spine showed an intradural,partially cystic mass extending from T12 to L3 *** patient underwent a T11-L4 *** opening the dura,a yellowish vascular tumor attached to the conus medullaris came into *** dissection allowed for subtotal tumor *** a thin part of the tumor wall,tightly attached to the conus medullaris,was *** tumor was diagnosed as mature teratoma by histological study,and no adjunctive therapy was *** pain experienced by the patient disappeared *** condition remained unchanged with no radiological recurrence through the most recent follow-up examination,3 years after *** present study outlines that mature teratoma can arise from the conus medullaris,even in older adult *** preservation is of utmost importance,and long-term follow-up is mandatory to spot recurrences early.

关键词： Conus medullaris tumor mature teratoma surgery

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Microwave-Assisted Hydrolysis of Hemicellulose over Sulfonated Catalysts

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Advances in Materials Physics and Chemistry 2022年第11期12卷 306-322页

作者： Itidel Belkadhi Mohamed Achraf Bouabdellah Lassâad ben hammouda Zouhaier Ksibi Francesco Medina University Tunis-El Manar Tunisia Rovira I Virgili University Tarragona Spain

Sulfonated catalysts based on zirconia (SO3H-ZrO2), silica (SO3H-SBA-15) and zeolite (SO3H-ZSM-5) were studied in the catalytic hydrolysis reaction of hemicellulose in a microwave reactor. The prepared catalysts were characterized by various techniques (XRD, N2 physisorption at 77 K, SEM, TEM and NH3-TPD). The obtained results reveal that despite the differences in their structural and textural properties, the ZrO2, Al-SBA-15 and H-ZSM-5 supports show similar conversions. Doping supports with sulfonate species created hydrogen bonds between SO3H groups and increased the amount of weak acid sites, which enhanced the hydrolysis of hemicellulose. SO3H- ZSM-5 showed the highest catalytic activity followed by SO3H-SBA-15 while SO3H-ZrO2 exhibited a poor conversion. Furthermore, the catalytic hydrolysis of the hemicellulose leads to several interesting products, such as formic acid, acetic acid, lactic acid and xylan. The correlation between the catalytic performances and the acidic properties of the different samples indicates that the best catalytic performances were obtained with the least acidic solids and especially when the density of strong acid sites decreases.

关键词： ZrO2 Al-SBA-15 H-ZSM-5 SO3H Hemicellulose Microwave

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Evaluation of Targeted Therapy for Locally Advanced or Metastatic Renal Cell Carcinoma in Tunisia

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Open Journal of Gastroenterology 2016年第7期6卷 197-204页

作者： Khaled ben Ahmed Amira Daldoul Ghassen Tlili Laila ben Fatma Olfa Gharbi Mahdi Afrit Jihene Fkih hammouda Boussen Mounir Frikha Faouzi Mosbah Slim ben Ahmed Department of Urology Sahloul University Hospital Sousse Tunisia Department of Medical Oncology Farhat Hached University Hospital Sousse Tunisia Department of Medical Oncology Abderrahman Mami University Hospital Ariana Tunisia Department of Medical Oncology Habib Bourguiba University Hospital Sfax Tunisia

Introduction: Renal cell carcinoma (RCC) is known to be chemo resistant but with the introduction of targeted therapies;there has been a “revolution” in its treatment strategies. The only targeted therapy available in Tunisia for the treatment of metastatic and/or locally advanced RCC is sunitinib. Objective of the Study: To evaluate therapeutic results and tolerance of sunitinib in metastatic and/or locally advanced RCC. Subjects and Methods: This was a retrospective study covering a period of six years (from January 2008 to January 2014) conducted in 5 medical oncology departments in Tunisia. The population of the study consisted of 29 patients treated with sunitinib for metastatic and/or locally advanced RCC. Results: The mean age of patients was 51 years. Three patients had tumor recurrence and 26 patients had a metastatic RCC. The prognosis was good for 5 patients, intermediate for 19 patients and poor for 5 patients. The median duration of treatment was 5 months. Because of side effects, treatment was discontinued in 12.5% of cases and the dose was reduced in 10.3% of cases. Side effects consisted of asthenia (95.8%), stomatitis (70.8%), anemia (50%), hand-foot syndrome (55.8%) in addition to nausea and vomiting (54.2%). Objective response was observed in 37.5% of patients after 3 months of treatment and in 50% after 6 months. The median progression-free survival was 14 months (95% CI, 7.9 to 20.6). The median overall survival was 22 months (95% CI, 15.6 to 28.7). Conclusion: The prognosis of RCC in Tunisian patients has clearly improved with the introduction of sunitinib, but other therapies with a proven efficacy as a first and second line therapy should be considered.

关键词： Renal Cell Carcinoma Metastasis Molecular Targeted Therapy Sunitinib Drug Tolerance

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Synthesis and Characterisation of Cr(III) and Co(II) Schiff Base Complexes

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Materials Sciences and Applications 2023年第2期14卷 53-62页

作者： Fatin M. Elmagbari Ahmed N. hammouda Hamdi A. M. bennour Rashd M. EL-Ferjani Younis O. ben Amer Department of Chemistry Faculty of Science University of Benghazi Qar-Yunis Benghazi Libya

Co(II) and Cr(III) metal complexes of Schiff bases were synthesized from the condensation reaction between 4-(dimethylamino)benzaldehyde and 4-amino-3-hydroxy-naphthalene-1-sulfonic acid. Their structures were investigated by elemental analysis, molar conductance measurements, infrared spectroscopy, electronic spectroscopy, and 1HNMR spectroscopy. The elemental analysis data suggested a 1:1 [M:L] ratio for the complexes. The molar conductance measurements of the complexes indicate their electrolytic nature in DMSO as a solvent. The absorption bands in the electronic spectra verified an octahedral environment around the metal ions in the complexes.

关键词： Schiff Base Ligand Complexes 1HNMR Spectra

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Synthesis and Characterization of Cr(III) &Fe(II) Bis(2-Methoxybenzylidene)Biphenyl-4,4'-Diamine Complexes

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Open Journal of Inorganic Chemistry 2020年第1期10卷 6-14页

作者： Younis O. ben Amer Rehab N. El-Daghare Ahmed N. hammouda Rashd M. El-Ferjani Fatin M. Elmagbari Chemistry Department Faculty of Science Benghazi University Benghazi Libya

Bis(2-methoxybenzylidene)biphenyl-4,4'-diamine Schiff base was prepared by the reaction of benzidine and O-methoxy benzaldehyde 1:2 reaction. Two complexes of this ligand with Cr(III) and Fe(II) were prepared. All prepared compounds were analysed using elemental analysis, IR, 1H NMR and mass spectroscopy. The formation of proposed structures, including the free ligand and complexes were confirmed.

关键词： Schiff Base Complexes Spectroscopy Bis(2-Methoxybenzylidene)Biphenyl-4 4'-Diamine

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Microwave-Assisted Hydrolysis of Hemicellulose over Sulfonated Catalysts

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Advances in Materials Physics and Chemistry（材料物理与化学进展） 2022年第11期

作者： itidel belkadhi mohamed achraf bouabdellah lassâad ben hammouda zouhaier ksibi francesco medina

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Synthesis and Characterisation of Cr(III) and Co(II) Schiff Base Complexes

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Materials Sciences and Applications（材料科学与应用期刊） 2023年第2期

作者： Fatin M.Elmagbari Ahmed N.hammouda Hamdi A.M.bennour Rashd M.EL-Ferjani Younis O.ben Amer

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