Sumana Ghosh has completed B.E. from IIEST, Shibpur and M.Tech. from IIT, Kharagpur. She has got Ph.D. degree from Jadavpur University, Kolkata. Currently, she is the Principal Scientist of CSIR-Central Glass and Ceramic Research Institute (CSIR-CGCRI), a premier research organization in India. She is working in the field of coating, joining and microwave processing of materials. She has published 45 papers in reputed journals. She has published 55 papers in national and international conference proceedings/ book of abstracts. She has 5 Indian patents and 7 book chapters. She has presented 9 lectures as invited speaker. She is a reviewer of some SCI journals
Statement of the Problem: Gas turbines produce energy at very high temperatures. Usually, creep, spallation and delamination occur in the metallic parts of gas turbines leading to deterioration of the turbine blades resulting in decrease in gas turbine efficiency. Thermal barrier coatings (TBCs) are provided to protect the metallic parts of gas turbines from the high inlet temperature. During thermal cycling at higher temperatures TBCs get damaged due to spallation on account of hot corrosion and oxidation of the metallic components of TBCs. In the present study, two types of TBCs were investigated for their thermal cyclic resistance at 1000℃ for 500 cycles: conventional TBC having NiCoCrAlY bond coat and 8-YSZ top coat and new TBC with glass-ceramic bond coat and 8-YSZ top coat. Methodology: Assessment of weight change, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis were performed for both TBCs after thermal cyclic tests at 1000℃ for 500 cycles. Findings: Weight change measurement indicated that formation of thermally grown oxide (TGO) dominated over the coating spallation up to 300 cycles in case of both TBCs. On the contrary, coating spallation was much more than TGO formation beyond 300 cycles for both TBCs. Further, TGO was not appeared at the bond coat/top coat interface of glass-ceramic bond coated TBC system whereas it was clearly observed in the interfacial region of bond coat and top coat of conventional TBC system after completion of 500 cycles at 1000oC. Conclusion & Significance: Glass ceramics as a bond coat in a TBC system can provide better heat resistance, oxidation resistance and good stability towards thermal cycling compared to conventional TBC system. Moreover, TGO formation could be avoided by using this new TBC system, which is the most significant controlling factor for the TBC degradation.
Anum Zulfiqar has done his graduation in Department of Physics, University of Agriculture Faisalabad, Pakistan.
For a wide variety of innovation, nano-technology is an umbrella term. Nano-technology and Nano-science is an exceptional multidisciplinary field of technology and applied science proposed to understand, use and create molecular and atomic-scale structures. Plasma Nanoscience is an extremely fascinating and fertile field where many exciting discoveries and feasible applications can be anticipated in the years ahead. Plasma nano-science research bridges the nano-technology and nano-science, physics of plasma and gas discharges. The most widely recognized types of plasma reactors and plasma utilized in the nanoscale plasma processing and synthesis is low and high pressure, thermal plasma, liquid-plasma interaction and etc. In the field of plasma science and technology, microencapsulation through liquid-plasma interaction methods is turning into an undeniably significant topic. In numerous applications extending from material science, health treatment and ecological remediation the interaction of non-equilibrium plasma with fluid state is significant. Silver coated copper nanorods have been one of the intriguing materials in micro-electronic engineering because of their extraordinary thermal and electrical properties. Copper rods show dominant electrical, mechanical and optical properties and held great promise for low-cost fabrication. The oxidation of the copper nanowires and strong thermal stability can be well suppressed by the encapsulation of copper rods with silver nanoparticles. Microencapsulation of copper nanowires with silver nanoparticles is done through DC thermal plasma. In this technique, silver coated copper nanowires synthesized through silver nitrate, fructose and sucrose. The samples were prepared through the various concentration ratio of fructose and sucrose. During the synthesis process, samples dried at 90 Â temperature in an oven and annealed at 300 Â for one hour. The samples were prepared for further characterization. XRD and SEM technique were used to explain structure, phase and particles size and surface morphology. Thermo gravimetry analysis was used to elaborate the thermal behavior of metallic nanowires.
Xiumin Wang has been focusing on this special narrow field of AMP for many years, especially design of different antibacterial agents, antibacterial activity, and mode of actions.
Gram-negative bacteria are the most common cause of sepsis and lipopolysaccharide (LPS) is a major inducer of sepsis. LBP14, a core domain (residues 86-99) of LPS-binding protein, has strong ability to neutralize LPS. Lfcin7 (L7) is a bovine lactoferricin (LfcinB) derivative, which possesses potent antibacterial activity. In this study, the cleavable chimeric peptide-R7 was generated by connecting LBP14 and L7 via a cleavable linker to improve antibacterial and anti-inflammatory activities. Compared to parent peptide L7, the antibacterial activity of R7 against Escherichia coli, Salmonella typhimurium and Staphylococcus aureus was increased by 2~4-fold; the ability of R7 to neutralize LPS was markedly higher than that of L7. R7 had low hemolysis to mouse red blood cells but some toxicity towards RAW264.7 cells. R7 could be cleaved by furin in vitro in a time-dependent manner, and could release L7 and LBP14 in serum. In vivo, after prevention with R7, the survival rate of the mice challenged with multidrug-resistant (MDR) E. coli or LPS was 100%, higher than that of L7 (60% and 40%). R7 significantly inhibited inflammatory response by down-regulating tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and interleukin-1β (IL-1β) levels and by up-regulating interleukin-10 (IL-10) and intestinal alkaline phosphatase (IAP) levels. It suggests that R7 may be promising dual-function candidates as novel antibacterial and anti-endotoxin agents to prevent bacterial sepsis.
I am Hayatu Misbahu Abdullahi from Nigeria born on 1985 studied BEng,MSc, Materials and Metallurgical Engineering.(PhD Inview). Lecturer, Welding and Fabrication Engineering Department from Jigawa State Polytechnic,Dutse, Nigeria. Attended and presented papers in National conferences. I have published articles Have numerous publications in national and International Journals. Webinar: Participated in many webinars.
During the current period of covid-19 pandemic where international flight/shipping are suspended, supply of materials and equipmen for oil and gas industries might have been hindere Stainless steel filler metal may be scarce in the plant. Selection of filler metal is critical in dissimilar metal welding involving stainless steel, this is due to the weldability challenges associated with the technique.As a result, it is necessary employ the available filler metal for the progress of production/maintenance. Dissimilar weld joints of 316 stainless steel/HSLA steel were joined using ER316L-16 and E7018 filler metals. The joints were subjected to tensile test and tensile values were determined, computed, recorded and analysed.According to the results obtained and analysis carried –out the weld joint of E7018 filler metal presented higher ultimate tensile strength of 498MPa than weld joint of ER316L-16 filler metal of ultimate tensile strength of 450MPa.Specimen A indicated percent elongation of 15% while specimen B 19.5%.The results were compared with related previous works. Tensile strengths of specimen A and B are superior to that of HSLA steel but inferior to 316SS in as-received condition proving that the weld joints meet requirement for engineering applications.