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Applicability of unique scarf joint configuration in friction stir welding of AA6061-T6:Analysis of torque,force,microstructure and mechanical properties

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Defence Technology（防务技术） 2022年第4期18卷 567-582页

作者： Durjyodhan Sethi Uttam Acharya Shashank Shekhar Barnik Saha roy Department of Mechanical engineering National Institute of Technology AgartalaBarjalaJiraniaWest TripuraPin-799046India Department of Materials Science and engineering Indian Institute of Technology KanpurKanpur208016India

The present research introduces a unique concept of scarf joint technique in friction stir welding(FSW) of aluminum alloy AA 6061-T6 plates and an investigation on weld quality.A new joint configuration with two distinct scarf angles(75°and 60°) was considered in this *** various aspects of welding were compared with contemporary simple square butt(SSB) joint *** was carried out at a constant tool rotation speed(TRS),tool traverse speed(TTS) and tool tilt angle of 1100 rpm,2 mm/s and2°,*** results are analyzed in terms of force and torque distribution,microstructure,macrostructure,and mechanical property perspective for different joint *** study reveals the minimum amount of force and torque at 60°scarf angle joint configuration compared to that of square butt joint *** study shows that all the joints were defect-free,and a prominent onion ring was present in the lower portion of the weld nugget(WN).Fine equiaxed grains with a minimum average grain size diameter of 6.82 μm were obtained in the WN of scarf joint configuration(SJC).The maximum ultimate tensile strength(UTS) and maximum average NZ hardness of 267 MPa and83.82 HV0.1were obtained in SJC3 at a scarf angle of 60°.It has been observed from the investigation that the joint efficiency increases from 72.5%(SSB) to 86%(SJC3) at a 60° scarf *** unique characteristic may lay an impetus on probable joint strength enhancement technique without increasing the production cost.

关键词： Friction stir welding Joint configuration Al alloys Force and torque Microstructure Mechanical property

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Fabrication and Characterization of Banana Pseudostem Fibre Reinforced epoxy Hybrid Composite Using Al_(2)O_(3) as Filler

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Journal of Bionic engineering 2023年第4期20卷 1737-1746页

作者： Ankit Samal Sanjeev Kumar Manish Bhargava Barnik Saha roy Mechanical engineering Department National Institute of Technology AgartalaJiraniaTripura799046India Mechanical engineering Department Subharti Institute of Technology and EngineeringMeerutUttar Pradesh250005India

Natural fibre-reinforced composites are now becoming incredibly common in various products because of their comparable qualities to conventional *** to its availability,superior mechanical qualities,and low cost,banana pseudostem is extensively used in various applications requiring natural *** study investigates the physical and mechanical properties of epoxy composites reinforced with banana pseudostem fibres that contain Al_(2)O_(3) *** order to produce composites with fibre and filler loadings,manual hand layup was *** and filler loading effects on composite properties were studied in *** results of the investigations demonstrate that proportion of Al_(2)O_(3) in composites significantly influences their mechanical and physical ***,the composite with a fibre content of 30%shows improved mechanical proportions and *** analysis was used to study the composite's thermal *** are more thermally stable than raw *** Transform Infrared Spectroscopy and Scanning electron microscopy analyses were used to characterize the composites.

关键词： Banana Pseudostem fibre Al_(2)O_(3) epoxy Characterization Mechanical properties

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exploring the merits of geographical diversification of solar PV power plants for a resilient PV-dominated electricity grid in India

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Clean energy 2023年第4期7卷 885-910页

作者： Saikat Ghosh Jatindra Nath roy Chandan Chakraborty Advanced Technology Development Centre Indian Institute of Technology Kharagpur721302India Department of electrical engineering Indian Institute of Technology Kharagpur721302India

India is highly dependent on solar photovoltaics(PV)to harness its vast solar resource potential and combat climate ***,∼90%of the installed PV capacity in India is concentrated in the top nine states,with the remaining states lagging *** research reveals that during monsoons,heavy cloud cover and rain lead to high solar resource variability,intermittency and the risk of very low PV generation,which can result in reliability issues in future PV-dominated electricity *** energy storage can help in overcoming high intermittency,there are multiple challenges associated with *** novelty of this study lies in demonstrating the benefits of combining multiple PV sites in various regions to mitigate the risks of low PV generation and high *** variability of individual sites was found to be up to∼3.5 times higher than the variability of combined *** noon,prominent solar park sites like Bhadla and NP Kunta experience a decrease in power generation to values as low as∼10%of the rated PV ***,the minimum generation of the large-scale dispersed PV generation is>30%.Furthermore,the research identifies other benefits of dispersing PV generation across the country,viz.,reduction of seasonal variability by adding PV capacity in the southern region,widening of the PV generation span,more room for PV capacity addition,reduction in storage and ramping needs,utilization of hydroelectric potential of the north-east and PV potential of Ladakh,and creating opportunities for sustainable development in rural agrarian regions through agrivoltaics.

关键词： decarbonization PV-based resilient grid PV variability and intermittency solar PV power plants

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Contentious Politics,State Repression and Civil Dissidence:The Discourse of Resistance in Utpal Dutt's Nightmare City

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外国语言与文化(英文) 2023年第1期7卷 103-113页

作者： Oliva roy GLA University Mathura

In the Post-Independence era,the prolific playwrights of India started using the aesthetic form of theater to contest authoritarian structures,and to voice their antiestablishment *** Dutt,a pioneering figure in Modern Indian Theater,used the medium of drama for propaganda and political conscientization of the *** indefatigable thespian contributed significantly towards the formation of modern Bengali theater,as his plays voiced his intransigent protest against the authoritarian government and concurrently,showed his impressive experimentation with different dramatic techniques,theatrical devices and theatrical ***'s anti-establishment play,Nightmare City presents a fastidious account of the turbulent years of late-1960s and early-1970s Bengal gripped by Naxalite violence and police *** against the backdrop of Naxalite insurgency,the play savagely exposes the ideological hypocrisy of the autocratic government leaders of the time and their violent ***,the playwright,in sync with his earlier plays,has not only portrayed the tumultuous sociopolitical ambiance of the 70s Calcutta,but has also constructed a soul-shattering voice of resistance to the political oppressions perpetuated by the state *** objective of this paper is to study the revolutionary propaganda of Dutt and redefine his concept of"political theater"with special reference to his intricately structured political satire,Nightmare City.

关键词： political satire violence activism political theater repression

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Acanthus leucostachyus leaf extracts promote excision wound healing in mice

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Asian Pacific Journal of Tropical Biomedicine 2022年第11期12卷 475-482页

作者： Deepjyoti Dev Ashish Sarkar Bishnupada roy Parasitology and Toxicology Laboratory Department of ZoologyNorth-Eastern Hill UniversityShillong-793022MeghalayaIndia

Objective:To evaluate the in vivo wound healing activity of Acanthus leucostachyus leaf extracts using an excision wound model in ***:Mice were divided into two groups of six animals in each group:the control group and the Acanthus leucostachyus extract-treated *** potential was evaluated by determination of physical parameters(contraction rate,epithelialization period,and tensile strength),biochemical parameters(protein,DNA,and hydroxyproline content),the expression of growth factor and pro-inflammatory cytokines,as well as histological and ultrastructural ***:Treatment with Acanthus leucostachyus leaf extracts markedly increased the rate of wound contraction,tensile strength,the concentrations of protein,DNA,and hydroxyproline,and the expression of growth factor,as well as promoted epithelialization,compared to the *** addition,Acanthus leucostachyus leaf extracts significantly reduced the expression of pro-inflammatory *** and ultrastructural studies revealed the presence of thicker epithelial layer and smoother surface topography in the extract-treated group compared to the ***:Acanthus leucostachyus leaf extracts show potent wound-healing activity and can be used as a wound healing agent.

关键词： Chronic wounds Acanthus leucostachyus epithelialization period Tensile strength Hydroxyproline Pro-inflammatory cytokine Wound healing

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Calculation of Available Transfer Capability Using Hybrid Chaotic Selfish Herd Optimizer and 24 Hours ReS-thermal Scheduling

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Chinese Journal of electrical engineering 2023年第4期9卷 54-72页

作者： Kingsuk Majumdar Provas Kumar roy Subrata Banerjee Department of electrical engineering Dr.B C Roy Engineering CollegeDurgapur 713206India Department of electrical engineering Kalyani Government Engineering CollegeKalyani 741235India Department of electrical engineering NIT DurgapurDurgapur 713209India

As fossil fuel stocks are being depleted,alternative sources of energy must be ***,traditional thermal power plants must coexist with renewable resources,such as wind,solar,and hydro units,and all-day planning and operation techniques are necessary to safeguard nature while meeting the current *** fundamental components of contemporary power systems are the simultaneous decrease in generation costs and increase in the available transfer capacity(ATC)of current *** units are linked to sources of renewable energy such as hydro,wind,and solar power,and are set up to run for 24 *** contrast,new research reports that various chaotic maps are merged with various existing optimization methodologies to obtain better results than those without the inclusion of *** seems to increase the performance and convergence properties of existing optimization *** this study,selfish animal tendencies,mathematically represented as selfish herd optimizers,were hybridized with chaotic phenomena and used to improve ATC and/or reduce generation costs,creating a multi-objective optimization *** evaluate the performance of the proposed hybridized optimization technique,an optimal power flow-based ATC was enforced under various hydro-thermal-solar-wind conditions,that is,the renewable energy source-thermal scheduling concept,on Ieee 9-bus,Ieee 39-bus,and Indian Northern Region Power Grid 246-bus test *** findings show that the proposed technique outperforms existing well-established optimization strategies.

关键词： Available transfer capability(ATC) biogeography-based optimization(BBO) chaotic map chaotic selfish herd optimizer(CSHO) grey wolf optimizer(GWO) optimum power flow(OPF) power generation cost(PGC) renewable energy sources(ReS) selfish herd optimizer(SHO)

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Reveal Hydrogen Behavior at Grain Boundaries in Fe-22Mn-0.6C TWIP Steel via In Situ Micropillar Compression Test

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Acta Metallurgica Sinica(english Letters) 2023年第7期36卷 1095-1104页

作者： Xu Lu Dong Wang Di Wan Xiaofei Guo roy Johnsen Department of Mechanical and Industrial engineering Norwegian University of Science and Technology7491 TrondheimNorway School of Materials Science and engineering Shanghai UniversityShanghai 200444China Steel Institute(IeHK) RWTH Aachen University52072 AachenGermany

In this study,the effect of hydrogen on dislocation and twinning behavior along various grain boundaries in a high-manganese twinning-induced plasticity steel was investigated using an in situ micropillar compression *** compressive stress in both elastic and plastic regimes was increased with the presence of *** investigation by transmission electron backscatter diffraction and scanning transmission electron microscope demonstrated that hydrogen promoted both dislocation multiplication and twin formation,which resulted in higher stress concentration at twin-twin and twin-grain boundary intersections.

关键词： Hydrogen TWIP steel Micropillar compression Grain boundary t-eBSD

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In situ nanomechanical characterization of hydrogen effects on nickel-based alloy 725 under different metallurgical conditions

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Journal of Materials Science & Technology 2023年第4期135卷 156-169页

作者： Xu Lu Yan Ma Ding Peng roy Johnsen Dong Wang Department of Mechanical and Industrial engineering Norwegian University of Science and Technology(NTNU)7491 TrondheimNorway Max-Planck-Institut für eisenforschung GmbH 40237 DüsseldorfGermany Department of Physics Norwegian University of Science and Technology(NTNU)7491 TrondheimNorway

The effect of hydrogen on the surface morphology and nanomechanical properties of Ni-based Alloy 725 under solution-annealed(SA)and precipitation-hardened(API)conditions was thoroughly *** investigation involved in situ nanoindentation testing,microscopy characterization,statistical analy-sis,and numerical simulation *** results showed the distinctive effects of hydrogen on the pop-in and hardness in the SA and API *** the SA sample,hydrogen mainly dissolved as solid solute in the matrix,causing enhanced lattice friction on the dislocation motion and increasing the in-ternal stress via lattice ***,an enhanced hardness,a reduced pop-in width/load ratio,and numerous surface steps were detected in the presence of *** the API sample,the strengtheningγ″phases were the stress concentrators,and the dislocations nucleated heterogeneously,demonstrating indistinctive pop-in ***,the precipitates in the API sample affected the trapping be-havior of hydrogen,thereby resulting in the hardness change,which reflected the competition between solution hardening in the matrix and vacancy softening mechanism in precipitates.

关键词： Hydrogen Nickel-based alloy In situ nanoindentation Precipitates Dislocation nucleation Hardness

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Decrypting a path based approach for identifying the interplay between PI3K and GSK3 signaling cascade from the perspective of cancer

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Genes & Diseases 2022年第4期9卷 868-888页

作者： Abhijit Das Barshana Bhattacharya Souvik roy Department of Pharmacology NSHM Knowledge CampusKolkata-Group of InstitutionsKolkata 700053India

Cancer is one of those leading diseases worldwide, which takes millions of lives every year. Researchers are continuously looking for specific approaches to eradicate the deadly disease, ensuring minimal adverse effects along with more therapeutic significance. Targeting of different aberrantly regulated signaling pathways, involved in cancer, is surely one of the revolutionary chemotherapeutic approach. In this instance, GSK3 and PI3K signaling cascades are considered as important role player for both the oncogenic activation and inactivation which further leads to cancer proliferation and metastasis. In this review, we have discussed the potential role of GSK3 and PI3K signaling in cancer, and we further established the crosstalk between PI3K and GSK3 signaling, through showcasing their cross activation, cross inhibition and convergence pathways in association with cancer. We also exhibited the effect of GSK3 on the efficacy of PI3K inhibitors to overcome the drug resistance and preventing the cell proliferation, metastasis in a combinatorial way with GSK3 inhibitors for a better treatment strategy in clinical settings.

关键词： Cancer Chemotherapy Drug resistance GSK3 PI3K

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Convergence of Weak Galerkin Finite element Method for Second Order Linear Wave equation in Heterogeneous Media

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Numerical Mathematics(Theory,Methods and Applications) 2023年第2期16卷 323-347页

作者： Bhupen Deka Papri roy Naresh Kumar Raman Kumar Department of Mathematics Indian Institute of Technology GuwahatiGuwahati 781039India

Weak Galerkin finite element method is introduced for solving wave equation with interface on weak Galerkin finite element space(Pk(K),P_(k−1)(∂K),[P_(k−1)(K)]^(2)).Optimal order a priori error estimates for both space-discrete scheme and implicit fully discrete scheme are derived in L1(L2)*** method uses totally discontinuous functions in approximation space and allows the usage of finite element partitions consisting of general polygonal *** element algorithm presented here can contribute to a variety of hyperbolic problems where physical domain consists of heterogeneous media.

关键词： Wave equation heterogeneous medium finite element method weak Galerkin method semidiscrete and fully discrete schemes optimal error estimates

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