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Microstructure,wear and corrosion performance of plasma electrolytic oxidation coatings formed on D16T Al alloy

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Rare Metals 2020年第12期39卷 1425-1439页

作者： Wan-Ying Liu Ying Liu Carsten Blawert Mikhail-L.Zheludkevich Chun-Ling Fan mohd talha Yuan-Hua Lin College of Materials Science and Engineering Sichuan UniversityChengdu 610065China School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China Helmholtz-Zentrum Geesthacht Zentrum fur Material-und Küstenforschung GmbH.Institute of Materials Research Geesthacht 21502Germany Chongqing Xinyu Pressure Vessel Manufacturing Co. Ltd..Chongqing 402560China

The plasma electrolytic oxidation(PEO)coatings were produced on D16 T Al alloy in the aluminate and silicate electrolyte with and without *** phase composition,microstructure and elemental distribution of the coatings were tested by X-ray diffraction(XRD),scanning electron microscope(SEM)and energy dispersive X-ray spectroscopy(EDX).The wear and corrosion resistance of PEO coatings were evaluated by dry sliding wear tests and electrochemical impedance spectroscopy(EIS).The morphology feature of the wear tracks was compared and analyzed by SEM and three-dimensional *** results demonstrate that the structure,wear and corrosion resistance of PEO coatings with graphene are better than that of PEO coatings without *** coating fabricated in the aluminate electrolyte with graphene exhibited the lowest *** coated samples formed in silicate electrolyte with graphene displayed the thickest,densest and the most compact *** exhibited the best wear and corrosion resistance due to the incorporation mode of graphene in the *** mechanism of graphene improving the wear and corrosion resistance of PEO coating was further *** summary,the comprehensive performances of PEO coatings formed in silicate electrolyte on D16 T Al alloy are superior to that produced in aluminate electrolyte.

关键词： PEO coatings D16T Al alloy Graphene Wear Corrosion

Spatio-Temporal Land Cover Analysis in Makhawan Watershed (M.P.), India through Remote Sensing and GIS Techniques

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Journal of Geographic Information System 2014年第4期6卷 298-306页

作者： mohd talha Anees Akram Javed mohd Yousuf Khanday Department of Geology Aligarh Muslim University Aligarh India Geological Survey of India Srinagar India

The present study makes an attempt to assess land use/land cover (LU/LC) changes at watershed level through remote sensing and GIS techniques, in Makhawan Watershed, Madhya Pradesh (India). The study involves multi-temporal satellite data of IRS-1D LISS III of 2001 and IRS-P6 LISS III of 2011, which have been analyzed visually. The study reveals that major LU/LC changes were due to the combined effects of many parameters, viz.;decline in average rainfall, more urbanization, sustainable agricultural activities and successful wasteland reclamation programmes. The major LU/LC changes noticed in the watershed decrease in uncultivated land (15.79%), wasteland whereas increases in open scrub (13.99%) and cultivated land. Changes in LU/LC categories are also compared with elevation which shows that most of the changes are associated with low lying areas (lower elevation ranges) except open scrub which shows changes in both low as well as high elevation ranges. Another notable change is the shrinkage of reservoir during 2001-2011 period which is linked to the decline in rainfall over the years.

关键词： Land Use/Land Cover Remote Sensing GIS Watershed

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硅烷涂层对316L不锈钢耐腐蚀性能的影响

表面技术 2019年第2期48卷 220-225页

作者：林元华马毓聪 mohd talha 李冰石云升孙志鹏唐亮西南石油大学油气藏地质与开发国家重点实验室成都610500 西南石油大学材料科学与工程学院成都610500 重庆欣雨压力容器制造有限责任公司重庆402560

目的提高316L不锈钢的耐腐蚀性能。方法在316L不锈钢样品表面涂覆主要成分为1,2-二(三乙氧基硅基)乙烷(BTSE)的硅烷涂层。通过电化学分析测试,评价涂覆硅烷涂层的316L不锈钢的耐蚀性,并通过扫描电子显微镜和扫描电化学显微镜对其表面形... 详细信息

目的提高316L不锈钢的耐腐蚀性能。方法在316L不锈钢样品表面涂覆主要成分为1,2-二(三乙氧基硅基)乙烷(BTSE)的硅烷涂层。通过电化学分析测试,评价涂覆硅烷涂层的316L不锈钢的耐蚀性,并通过扫描电子显微镜和扫描电化学显微镜对其表面形貌进行分析。结果在相同的腐蚀环境下,与未涂覆硅烷涂层的316L不锈钢样品相比,涂覆硅烷涂层样品的表面更加光滑,点蚀现象明显好转。电化学测试结果显示,涂覆硅烷涂层的316L不锈钢样品的腐蚀电位为?565.02m V,未涂覆硅烷涂层样品的腐蚀电位为?796.01 mV,前者明显高于后者,其腐蚀倾向明显减小。另外,涂覆硅烷涂层的316L不锈钢样品的腐蚀电流为2.5177μA,未涂覆硅烷涂层样品的腐蚀电流为5.4291μA,涂覆硅烷涂层样品的腐蚀电流明显更小,表现出了更好的耐腐蚀性能。通过观察扫描电化学显微镜图像可以得出,未涂覆硅烷涂层的316L不锈钢样品的电流范围为?3.144×10?9～?1.957×10?9 A,涂覆硅烷涂层的316L不锈钢样品的电流范围为?3.004×10?9～?1.975×10?9A,涂覆硅烷涂层样品的电流范围更窄,腐蚀程度明显减轻。结论在316L不锈钢表面涂覆硅烷涂层可以在一定程度上减缓样品的腐蚀程度,硅烷涂层起到了物理屏障的作用,显着提高了316L不锈钢的耐腐蚀性。

关键词：腐蚀硅烷涂层电化学不锈钢点蚀

Role of needle knife assisted ampullary biopsy in the diagnosis of periampullary carcinoma

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World Journal of Gastrointestinal Endoscopy 2011年第11期3卷 220-224页

作者： mohd talha Noor Kim Vaiphei Birinder Nagi Kartar Singh Rakesh Kochhar Department of Gastroenterology Postgraduate Institute of Medical Education and Research Sector 12 Chandigarh 160012 India

AIM:To study the role of needle knife assisted ampullary biopsy in the diagnosis of periampullary ***:In this study the authors retrospectively analyzed clinical records of patients with periampullary tumors diagnosed by ampullary biopsy taken after needle knife papillotomy in whom surface ampullary biopsies were non ***:Between January 2008 and December 2010,38 patients with periampullary tumors were seen by us and initial side viewing endoscopy with surface biopsy from the papilla was positive for malignancy in 25 *** patients with a negative surface biopsy for malignancy underwent a repeat ampullary biopsy following needle knife *** were 8(61.5%)males and 5(38.5%)*** most common presenting symptom was jaundice(100%),followed by fever(46.2%),melena(38.5%),abdominal pain(30.8%)and weight loss(30.8%).All the patients had hyperbilirubinemia with a mean ± SD serum bilirubin of(11.2 ± 1.9)mg/dL(normal value 70.5 IU/L)in all of them with a median of 1200 IU/L(inter quartile range 274-3500).Side viewing endoscopy showed a bulky papilla in all of *** tissue was obtained in all of the 13 patients for histological evaluation;12 of the 13 patients were reported to have adenocarcinoma while one patient had *** were no complications from the needle knife papillotomy in any of the ***:Needle knife assisted ampullary biopsy appears to be a safe and effective diagnostic modality for periampullary carcinoma.

关键词： Carcinoma Periampullary Papillotomy Needle knife Endoscopic ultrasound Endoscopy

纳米TiO2对D16T铝合金微弧氧化膜耐磨性的影响及机理

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表面技术 2019年第10期48卷 180-189页

作者：刘婉颖邱宇洪刘颖林元华石云升 mohd talha 高婷艳西南石油大学材料科学与工程学院成都610500 西南石油大学油气藏地质及开发工程国家重点实验室成都610500 四川大学材料科学与工程学院成都610065

目的提高D16T铝合金的耐磨损性能。方法通过向硅酸盐和磷酸盐混合电解液体系中添加2 g/L纳米TiO2添加剂,利用微弧氧化技术在其表面制备微弧氧化陶瓷膜。采用X射线衍射仪(XRD)、扫描电镜(SEM)、能谱分析仪(EDS)、显微硬度计、厚度测试仪... 详细信息

目的提高D16T铝合金的耐磨损性能。方法通过向硅酸盐和磷酸盐混合电解液体系中添加2 g/L纳米TiO2添加剂,利用微弧氧化技术在其表面制备微弧氧化陶瓷膜。采用X射线衍射仪(XRD)、扫描电镜(SEM)、能谱分析仪(EDS)、显微硬度计、厚度测试仪、摩擦磨损试验机等,研究了纳米TiO2添加剂对D16T铝合金微弧氧化膜的结构和耐磨损性能的影响及机理。结果纳米TiO2的添加使得微弧氧化膜层的表面变得更加平整、致密,具有更少的微孔和裂纹,大大改善了膜层结构。相比于未添加纳米TiO2的电解液中制得的微弧氧化膜,在含纳米TiO2的电解液中所制得的微弧氧化膜中有新相TiO2生成,并且促使更多的α-Al2O3相和γ-Al2O3相生成,使膜层厚度得到明显增加,膜厚达31.2μm,显微硬度也得到显著提高,达510HV。纳米TiO2的添加,降低了D16T微弧氧化膜层试样的摩擦系数,平均摩擦系数为0.45,明显低于不含纳米TiO2的D16T微弧氧化膜层试样的摩擦系数(0.75)。结论加入到电解液中的纳米TiO2在微弧氧化反应过程中已进入到所形成的氧化膜层,并且填充了膜层中的微孔和裂纹,改善了膜层结构,增加了膜层厚度,显著提高了微弧氧化膜层的显微硬度和耐磨损性能。

关键词：纳米TiO2 微弧氧化 D16T铝合金摩擦系数显微硬度耐磨性

石墨烯增强功能梯度多孔梁材料不确定性对热机械过屈曲行为的影响

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Acta Mechanica Sinica 2023年第4期39卷 21-43页

作者： Fahed mohd Mohammad talha Computational Design Lab School of Mechanical and Materials EngineeringIndian Institute of Technology MandiMandi175075India

本文旨在研究石墨烯片增强功能梯度多孔梁材料不确定性对在热环境下的过屈曲行为的影响.通过采用随机有限元方法,已经完成了全面的确定性和随机性研究.考虑了温度依赖性(TD)和温度无关性(TID)的材料特性.使用Halpin-Tsai微力学模型估计... 详细信息

本文旨在研究石墨烯片增强功能梯度多孔梁材料不确定性对在热环境下的过屈曲行为的影响.通过采用随机有限元方法,已经完成了全面的确定性和随机性研究.考虑了温度依赖性(TD)和温度无关性(TID)的材料特性.使用Halpin-Tsai微力学模型估计了杨氏模量等均质化有效材料性质,通过Voigt混合法则估计了密度和热膨胀系数.假设均质化的材料特性沿厚度方向以功能渐变的方式变化.所开发的公式基于高阶剪切变形理论,结合冯-卡门型几何非线性进行过屈曲分析.开发C^(0)有限元模型求解非线性控制方程组,使用直接迭代过程进行数值求解.所开发方法的收敛和验证研究也通过独立的蒙特卡罗模拟进行,以确保方法的准确性.分别讨论了材料设计参数如孔隙率含量、纳米填料量和材料特性(即杨氏模量、金属基体密度和纳米填料)的低变异性(随机性)等材料不确定性对FGGPLRC多孔梁热机械过屈曲行为的影响.结果表明,材料性能的不确定性会显著影响FG-GPLRC多孔梁的过屈曲响应.

关键词：杨氏模量功能梯度蒙特卡罗模拟纳米填料温度依赖性热膨胀系数材料特性直接迭代

Role of T cells in cancer immunotherapy:Opportunities and challenges

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Cancer Pathogenesis and Therapy 2023年第2期1卷 116-126页

作者： Hossain Ahmed Aar Rafi Mahmud mohd.Faijanur-Rob-Siddiquee Asif Shahriar Partha Biswas Ebrahim Khalil Shimul Shahlaa Zernaz Ahmed Tanzila Ismail Ema Nova Rahman Arif Khan Furkanur Rahaman Mizan talha Bin Emran Department of Biotechnology and Genetic Engineering University of Development Alternative(UODA)4/4BBlock ALalmatiaDhaka1209Bangladesh Department of Biochemistry and Molecular Biology Mawlana Bhashani Science and Technology UniversityTangail1902Bangladesh Department of Biochemistry and Molecular Biology Faculty of Biological ScienceUniversity of DhakaDhaka1000Bangladesh Department of Immunology and Microbiology School of MedicineUniversity of Texas Rio Grande ValleyMcAllenTX78504USA Department of Genetic Engineering and Biotechnology Faculty of Biological Science and TechnologyJashore University of Science and Technology(JUST)Jashore7408Bangladesh Department of Biochemistry and Microbiology North South UniversityDhaka1229Bangladesh Department of Biochemistry and Molecular Biology Jahangirnagar UniversitySavarDhaka1342Bangladesh Department of Food Science and Technology Chung-Ang UniversityAnseong17546Republic of Korea Department of Pharmacy BGC Trust University BangladeshChittagong4381Bangladesh Department of Pharmacy Faculty of Allied Health SciencesDaffodil International UniversityDhaka1207Bangladesh

Immunotherapies boosting the immune system's ability to target cancer cells are promising for the treatment of various tumor types,yet clinical responses differ among patients and ***,there has been increasing interest in novel cancer immunotherapy practices aimed at triggering T cell-mediated anti-tumor ***-directed cytotoxicity mediated by T lymphocytes has become a central focal point in the battle against cancer utilizing the immune *** molecular and cellular mechanisms involved in the actions of T lymphocytes have directed new therapeutic approaches in cancer immunotherapy,including checkpoint blockade,adoptive and chimeric antigen receptor(CAR)T cell therapy,and cancer *** review addresses all the strategies targeting tumor pathogenesis,including metabolic pathways,to evaluate the clinical significance of current and future immunotherapies for patients with cancer,which are further engaged in T cell activation,differentiation,and response against tumors.

关键词： Immunotherapy T cell Cancer Immune system Metabolic pathways