Nilotpal Banerjee

Bio: Nilotpal Banerjee is an academic researcher from National Institute of Technology, Durgapur. The author has contributed to research in topics: Gas compressor & Welding. The author has an hindex of 7, co-authored 29 publications receiving 229 citations. Previous affiliations of Nilotpal Banerjee include Calcutta School of Tropical Medicine.

Viral glycoproteins: biological role and application in diagnosis.

Abstract: The viruses that infect humans cause a huge global disease burden and produce immense challenge towards healthcare system. Glycoproteins are one of the major components of human pathogenic viruses. They have been demonstrated to have important role(s) in infection and immunity. Concomitantly high titres of antibodies against these antigenic viral glycoproteins have paved the way for development of novel diagnostics. Availability of appropriate biomarkers is necessary for advance diagnosis of infectious diseases especially in case of outbreaks. As human mobilization has increased manifold nowadays, dissemination of infectious agents became quicker that paves the need of rapid diagnostic system. In case of viral infection it is an emergency as virus spreads and mutates very fast. This review encircles the vast arena of viral glycoproteins, their importance in health and disease and their diagnostic applications.

Effect of shoulder diameter to pin diameter ratio on microstructure and mechanical properties of dissimilar friction stir welded AA2024-T6 and AA7075-T6 aluminum alloy joints

Abstract: Friction stir welding (FSW) is a solid-state joining process that uses the frictional heat generated by the rotating tool to soften the metals to form the joint. It is an effective technique for joining dissimilar aluminum alloys and finds its application in various fields such as aerospace and automotive industries. The various FSW parameters play a vital role in determining the quality of the welded joint. The parameters included in the study are tool rotational speed, welding speed, axial load, and shoulder diameter to pin diameter ratio. This paper mainly focuses on studying the effect of shoulder diameter to pin diameter ratio (D/d ratio) on the microstructure and mechanical properties of the dissimilar AA2024-T6 and AA7075-T6 aluminum alloy joints. The weld quality characteristics like macrostructure, microstructure, microhardness, and tensile properties of the joints are analyzed and presented for five different D/d ratios. The fractography images using scanning electron microscope (SEM) were presented for the joints with high and low strength. It is observed from the result that the joint fabricated using D/d ratio of 3 exhibits the better mechanical properties when compared to other joints.

Microstructural Evolution and Mechanical Properties of Friction Stir Welded Dissimilar AA2014-T6 and AA7075-T6 Aluminum Alloy Joints

Abstract: The dissimilar AA2014-T6 and AA7075-T6 aluminum alloy butt joints were made by friction stir welding with different process parameters. Friction stir welding is an efficient technique to join dissimilar aluminum alloys when compared to other traditional techniques. This paper aims to address the effect of various parameters, in particular the welding speed and shoulder diameter to pin diameter ratio (D/d ratio) on microstructures and mechanical properties of the joints. Six joints were made using two different welding speeds and three different D/d ratios without altering the tool rotational speed and the axial load. The results showed that the D/d ratio greatly influences the mechanical properties of the joints. Plastic deformation and recrystallization during the weld process resulted in the formation of distinct zones which could be identified by their respective microstructures. X-ray diffraction analysis was carried out to predict the formation of the precipitates which influences the properties of the joints. Fractographic images collected with a scanning electron microscope for establishing D/d ratio of 3, for two different welding speeds, were discussed. The dissimilar joints fabricated with the tool rotational speed 1200 RPM, welding speed 20 mm/min, axial load 8 kN, and D/d ratio of 3 yielded the higher tensile strength and hardness.

Handbook Of Human Vibration

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Recent Advances in Friction Stir Welding/Processing of Aluminum Alloys: Microstructural Evolution and Mechanical Properties

Abstract: Friction stir welding (FSW), a highly efficient solid-state joining technique, has been termed as “green” technology due to its energy efficiency and environment friendliness. It is an enabling technology for joining metallic materials, in particular lightweight high-strength aluminum and magnesium alloys which were classified as unweldable by traditional fusion welding. It is thus considered to be the most significant development in the area of material joining over the past two decades. Friction stir processing (FSP) was later developed based on the basic principles of FSW. FSP has been proven to be an effective and versatile metal-working technique for modifying and fabricating metallic materials. FSW/FSP of aluminum alloys has prompted considerable scientific and technological interest since it has a potential for revolutionizing the manufacturing process in the aerospace, defense, marine, automotive, and railway industries. To promote widespread applications of FSW/FSP technology and ensure t...

Friction Stir Welding of Dissimilar Aluminum Alloy Combinations: State-of-the-Art

Abstract: Friction stir welding (FSW) has enjoyed great success in joining aluminum alloys. As lightweight structures are designed in higher numbers, it is only natural that FSW is being explored to join dissimilar aluminum alloys. The use of different aluminum alloy combinations in applications offers the combined benefit of cost and performance in the same component. This review focuses on the application of FSW in dissimilar aluminum alloy combinations in order to disseminate research this topic. The review details published works on FSWed dissimilar aluminum alloys. The detailed summary of literature lists welding parameters for the different aluminum alloy combinations. Furthermore, auxiliary welding parameters such as positioning of the alloy, tool rotation speed, welding speed and tool geometry are discussed. Microstructural features together with joint mechanical properties, like hardness and tensile strength measurements, are presented. At the end, new directions for the joining of dissimilar aluminum alloy combinations should guide further research to extend as well as to improve the process, which is expected to raise further interest on the topic.

Indian Medicinal Plants and Formulations and Their Potential Against COVID-19-Preclinical and Clinical Research

Abstract: The cases of COVID-19 are still increasing day-by-day worldwide, even after a year of its first occurrence in Wuhan city of China. The spreading of SARS-CoV-2 infection is very fast and different from other SARS-CoV infections possibly due to structural differences in S proteins. The patients with severe diseases may die due to acute respiratory distress syndrome (ARDS) caused by systemic inflammatory reactions due to the excessive release of pro-inflammatory cytokines and chemokines by the immune effector cells. In India too, it is spreading very rapidly, although the case fatality rate is below 1.50% (https://www.statista.com), which is markedly less than in other countries, despite the dense population and minimal health infrastructure in rural areas. This may be due to the routine use of many immunomodulator medicinal plants and traditional AYUSH formulations by the Indian people. This communication reviews the AYUSH recommended formulations and their ingredients, routinely used medicinal plants and formulations by Indian population as well as other promising Indian medicinal plants, which can be tested against COVID-19. Special emphasis is placed on Indian medicinal plants reported for antiviral, immunomodulatory and anti-allergic/anti-inflammatory activities and they are categorized for prioritization in research on the basis of earlier reports. The traditional AYUSH medicines currently under clinical trials against COVID-19 are also discussed as well as furtherance of pre-clinical and clinical testing of the potential traditional medicines against COVID-19 and SARS-CoV-2. The results of the clinical studies on AYUSH drugs will guide the policymakers from the AYUSH systems of medicines to maneuver their policies for public health, provide information to the global scientific community and could form a platform for collaborative studies at national and global levels. It is thereby suggested that promising AYUSH formulations and Indian medicinal plants must be investigated on a priority basis to solve the current crisis.