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Feasibility of 0.02% Nb-Based Microalloyed Steel for the Application of One-Step Quenching and Partitioning Heat Treatment

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Materials Sciences and Applications 2021年第8期12卷 374-387页

作者： Basem Tarek Eman el-Shenawy ahm.d el-sabbagh Mohamed A. Taha design and Production Engineering department Faculty of Engineering Ain Shams University Cairo Egypt Plastic deformation department Central Metallurgical R&D Institute (CMRDI) Cairo Egypt

To attain an enhanced combination of mechanical properties for low alloyed steel, the current study has been made to fulfill that growing need in the industry. Its results are introduced within this paper. One step Quenching and Partitioning (Q&P) heat treatment has been applied on Niobium-based microalloyed steel alloy with 0.2 %C, in the form of 2 mm thickness sheets. The target of this study is to investigate the viability of applying that significantly recommended, results-wise, heat treatment on the highly well-suited alloy steel samples, to achieve the main target of enhanced properties. A single temperature of 275°C was used as quenching and Partitioning temperature. Four Partitioning periods (30, 200, 500, and 1000 Seconds) were used for soaking at the same temperature. The results were analyzed in the light of microstructural investigation and mechanical testing. All applied cycles did not enhance the strength but moderately improved the ductility and toughness, mainly caused by the slightly high soaking temperature used. Niobium impact of grain refining was apparent through all cycles. The cycle of 500 Seconds Partitioning time obtained optimum values at that particular temperature. The 1000 Seconds Cycle obtained the worst combination of properties. A set of recommendations are set. More research is required at this point, where a lower Partitioning temperature is advised. In the light of the applied combination of parameters, the Partitioning period at such temperature is advised to be between 500 and 1000 Seconds. A high probability that periods closer to 500 than 1000 Seconds will produce better results. More research is needed between those two values of Partitioning time to precisely determine the optimum time at that temperature on that specific alloy.

关键词： Nb-Based Microalloyed Steel Advanced High Strength Steel Quenching and Partitioning Retained Austenite Martensite Transformation Automotive Applications

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Clinicopathological features and treatment outcomes of brain stem gliomas in Saudi population

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World Journal of Clinical Oncology 2014年第5期5卷 1060-1067页

作者： Yasser Bayoumi Abdulrahman J sabbagh Reham Mohamed Usama M el Shokhaiby ahm.d Marzouk Maklad Mutahir A Tunio Ali Abdullah O Balbaid Consultant Radiation Oncology Comprehensive Cancer Center King Fahad Medical City Riyadh-59046 Saudi Arabia Radiation Oncology NCI Cairo University Cairo 11435 Egypt Neurosurgery King Fahad Medical City Riyadh-59046 Saudi Arabia Radiation Oncology NCI Cairo University Cairo 11435 Egypt Clinical Oncology Sohag University Sohag 11432 Egypt Radiation Oncology Comprehensive Cancer Center King Fahad Medical City Riyadh-59046 Saudi Arabia

AIM: To analyze experiences to identify treatment outcomes and prognostic factors in a Saudi ***: Medical records of patients with brainstem gliomas treated from July 2001 to december 2012 were reviewed to identify treatment outcomes of surgery, radiation therapy and chemotherapy and associated prognostic factors in a Saudi ***: We analyzed 49 brain stem glioma(BSG) patients from July 2001 to december 2012; 31 of them were males(63.3%) with a median age of 12.6 years(range: 8-64 mo). Twenty-two patients(44.9%) had diffuse intrinsic pontine gliomas(dIPG) and 15(30.6%) presented with focal/tectal BSG. Histopathology was available in 30 patients(61.2%). Median survival time for the whole cohort was 1.5 years. One and two year OS rates were 51.1% and 41.9% respectively. Two year OS rates for focal/tectal, dorsally exophytic, cervicomedullary and dIPG tumors were 60%, 33.3%, 33.3% and 13.6% respectively(P elated to OS were age at diagnosis(worse for > 18 years) P = 0.01, KPS duration of symptoms(d) P = 0.002, histology(better for favorable) P = 0.002, surgery(maximal resection) P = 0.002, and concurrent chemotherapy with radiation therapy in dIPG(better if given) P = ***: BSG, especially the dIPG subgroup, had a dismal prognosis, needing more aggressive neurosurgical, radiation and chemotherapy techniques, while focal and tectal tumors were found to have a better prognosis.

关键词： Brain stem glioma Children Adults Saudi Arabia Treatment outcomes

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Antifibrotic effect of aloe vera in viral infection-induced hepatic periportal fibrosis

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World Journal of Gastroenterology 2012年第17期18卷 2026-2034页

作者： Sahar K Hegazy Mohamed el-Bedewy Akira Yagi department of Clinical Pharmacy Faculty of PharmacyTanta UniversityTanta 8130Egypt department of Internal Medicine Faculty of MedicineTanta UniversityTanta 8130Egypt Placenta/Aloe Research Institute Japan Bio-Products Co.Ltd.1488-4Aikawa-machiKurume-shiFukuoka Bio Factory 204Fukuoka 839-0861Japan

AIM:To investigate the anti-oxidative and anti-fibrotic effects of aloe vera in patients with liver ***:Aloe vera high molecular weight fractions(ahm) were processed by patented hyper-dry system in combination of freeze-dry technique with microwave and far infrared-ray *** healthy volunteers as the control group and 40 patients were *** patients were randomly subdivided into two equal groups:the conventional group was treated with placebo(starch),and ahm group was treated with 0.15 gm/d ahm,both for 12 consecutive *** patients were investigated before and after *** activity of aspartate aminotransferase(AST),alanine aminotransferase(ALT),alkaline phosphatase(ALP),hyaluronic acid(HA),transforming growth factor-β(TGF-β) and matrixmetalloproteinase-2(MMP-2) were *** reduced glutathione(GSH) and malondialdehyde(MdA) levels in liver were assayed and the expression of hepatic α-smooth muscle actin(α-SMA) was identified by ***:At the start of the study,the hematoxylin and eosin staining revealed fibro-proliferated bile ductules,thick fibrous septa and dense inflammatory cellular infiltration in the patients before *** use of ahm for 12 wk significantly ameliorated the fibrosis,inhibited the inflammation,and resulted in minimal infiltration and minimal fibrosis compared to the conventional *** enzyme activities of the liver(ALT,AST and ALP) were attenuated after treatment in both groups,and the decrease in the ahm group was more significant as compared with the conventional *** to the AST,the MdA levels were significantly higher before treatment,and were attenuated after treatment in both *** contrast,the hepatic glutathione content in the patients were decreased significantly in the ahm group compared to the *** serum levels of the fibrosis markers(HA,TGF-β and MMP-2) were also reduced significantly after *** expression of α-SMA was m

关键词： Hepatic fine periportal fibrosis Aloe vera α-smooth muscle actin Transforming growth factor-β Hyaluronic acid

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