The Department of Environmental Science and Engineering at SRM University-AP organised its 3-day International Conference on Advances in Environmental Sustainability, Energy and Earth Sciences ( AESEE 2024). The inaugural session on March 14, 2024, featured industry experts, with Prof. Prakasham Tata from the Center for Transformation of Waste Technology, USA, as the Keynote Speaker and Dr Prakash Chauhan, Director-National Remote Sensing Centre, Indian Space Research Organization, as the Chief Guest for the event.

He highlighted the attributes of the department and lauded the efforts of the faculty and students who contributed to the publication of 165 articles, of which 106 were featured in Q1 Journals. This momentous occasion was witnessed by Vice Chancellor, Prof. Manoj K Arora; Advisor, Prof. V S Rao; Associate Professor and Head of the Department, Dr Rangabhasiyam Selvasembian; the organising secretaries, Dr Javed Ahmad Dar, Dr Pankaj Pathak and Dr Subashree Kothandaraman, along with participants from diverse parts of the globe, both online and offline.

Vice Chancellor-Prof. Manoj K Arora, in his address, emphasised that a congregation of such an intelligentsia is the need of the hour. He implored the audience to work at ground level and not confine themselves to mere talks and conferences, “go to the community and provide solutions, and solutions cannot be provided in the classrooms alone”, he stated.

Prakasham Tata, in his exuberant address, stated that the nation does not lack the intelligence or manpower to combat the alarming ecological crisis; It is the lack of trained personnel, pollution control boards, corruption and lack of effective cooperation between societal institutes that is causing a lax. Prof. Tata insisted that “universities like SRM AP are knowledge centres and have the tenacity and wisdom to combat the growing threats.” He issued a clarion call to all the youngsters and environmental enthusiasts to walk the talk.

Dr Prakash Chauhan, Director of the National Remote Sensing Centre, in his speech, cited Indians’ inherent way of living a sustainable lifestyle and went on to encourage the young participants in attendance to become true ‘karma yogis’ by innovating and finding new ways to promote and work towards environmental sustainability. He implored the youth to brainstorm innovative ideas that could gradually lead to monetisation opportunities while also benefitting the environment.

The inaugural day of the conference also marked the unveiling of the abstract book compiled by the department. Dr Javed Ahmad Dar, Assistant Professor and organising secretary of the conference, mentioned that the book consists of a total of 271 abstracts across 15 thematic areas. The event concluded with the Vice Chancellor and the Advisor honouring the guests with a token of appreciation.

In a significant scientific endeavour, Dr Maheshwar Dwivedy, Associate Professor in the Department of Mechanical Engineering, and Dr B Prasanna Nagasai, Post-Doctoral Researcher have jointly authored a research paper titled “Metallurgical Characteristics of AA6061 Aluminium and AZ31B Magnesium Dissimilar Joints by Fusion Welding Technique”. Their work delves into the metallurgical properties of dissimilar joints formed by fusion welding between AA6061 aluminium and AZ31B magnesium.

The study, published in the esteemed Q1 journal “Microscopy Research and Technique”, sheds light on the intricate interactions between these two dissimilar materials. By employing advanced microscopy techniques, the researchers meticulously examined the weld interfaces, grain structures, and elemental compositions. Their findings contribute to our understanding of the joining behaviour and intermetallic formation in such hybrid joints.

This collaborative effort exemplifies SRM University – AP’s commitment to cutting-edge research and interdisciplinary exploration. As the scientific community continues to unravel the mysteries of material behaviour, Dr Dwivedy and Dr Nagasai’s work stands as a beacon of knowledge and innovation.

Stay tuned for more updates on this groundbreaking research!

Abstract

Aluminium (Al) and magnesium (Mg) alloys are extensively used in the automobile sector because of their high strength-to-weight ratio, excellent castability, low density and simplicity of recycling. Al-Mg structures that automotive uses have a big chance of lowering their weight. Although there is a significant opportunity for substantial cost reduction, the use of magnesium in aluminium structures remains restricted. This study aims to weld 3 mm-thick rolled sheets of AA6061 Al and AZ31B Mg alloy using the cold metal transfer (CMT) arc welding process. Three different filler wires (ER1100, ER4043, and ER5356) were used in the experiment. In this article, the mechanical and microstructure characteristics of Al/Mg dissimilar joints manufactured by CMT are evaluated and discussed in depth. Optical microscope (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction were all used to analyse the CMT-welded Al/Mg dissimilar joints. Of the three filler wires used, ER4043 (Al-5%Si) filler wire yielded defect-free sound joints due to the presence of Si, which improves the flow ability of molten filler during welding. The Al/Mg dissimilar weld still produced the Mg-rich intermetallic (IM) Al12Mg17 and the Al-rich IM Al3Mg2. The surfaces of the fractured area of the CMT-welded Al/Mg dissimilar joints revealed the presence of the Mg-rich intermetallics (Al12Mg17), which is responsible for the decrease in tensile strength. The reduction of intermetallics, particularly of Mg-rich intermetallics (Al12Mg17) is important for improving joint strength.

Highlights

• Cold metal transfer (CMT) arc welding was used to control the Al-Mg-rich intermetallics in the Al/Mg dissimilar joints.
• The microstructure, morphology and phase composition of the welded joints were studied by OM, SEM, TEM, EDS and XRD.
• The weld metal and AL substrate are joined with a strong interface, while the weld metal and Mg substrate are joined with an epitaxial solidification area where the intermetallic compounds of Mg2Al3, Mg17Al12 and Mg2Si are generated.
• The weld metal on the Mg side experienced a brittle fracture, with a continuous distribution of Mg2Al3, Mg17Al12 and Mg2Si.

Explanation of Research in Layperson’s Terms

Al and Mg alloys are extensively used as light metals in engineering due to their advantageous characteristics, including high strength-to-weight ratio, cheap casting costs, low density, excellent machinability, and simple recyclability. Often, each of these materials fails to meet the criteria for lightweight buildings. Consequently, there is a high need for a significant quantity of Al/Mg hybrid structures in many industrial sectors with a particular emphasis on the automotive industry. Choosing the appropriate filler material for joining Al and Mg is crucial for creating robust weldments. The main difficulty in welding dissimilar metals like aluminium and magnesium lies in the formation of inflexible and brittle intermetallic compounds (IMCs) like Mg2Al3 and Mg17Al12, which severely affect the joint’s strength. When it comes to melting points, magnesium is at 650°C and aluminium is at 660°C. Based on the Mg-Al binary phase diagram, the compounds Mg2Al3 and Mg17Al12 can be produced at 450 and 437°C by eutectic reaction. Hence, the primary challenge in Al/Mg dissimilar welding is effectively suppressing the growing number of IMCs. Similarly, minimising energy input and utilising the appropriate chemistry of wire are the primary methods for decreasing the formation of IMCs and improving joint strength.

CMT is an advanced arc welding process which comes under controlled short circuiting transfer mode. The CMT welding cycle consists of two phases, i.e. the arcing phase and short circuit phase. In arcing phase, the filler wire gets melted and it forms as a droplet at the tip of the filler wire. In short circuiting phase, the droplet bridges the gap between the electrode and the weld pool. Once the short circuiting takes place, the filler wire gets retracted backward due to the retraction force and the droplet is detached from the filler wire. In conventional short circuiting transfer mode, the electromagnetic pinch force assists in detaching the droplet from the filler wire and thereby high heat input is produced by means of the short current. Where as in CMT short circuit transfer mode, the welding current is decreased to a lower value whenever a short circuit signal is sensed by the power source and the droplet gets separated from the filler wire with the help of the retraction force that is generated during the backward movement of the filler wire. Finally, the heat input is reduced to a lower value with this metal transfer mode. So, the CMT arc welding process was used to join the 3 mm-thick rolled sheets of AA6061 Al and AZ31B Mg alloy dissimilar materials. This article details the microstructural characteristics of an Al/Mg dissimilar joint. The CMT process controlled IMCs in the Al/Mg dissimilar joint and increased weld metal hardness compared to base metal.

The title of Research Paper in the Citation Format

aAddanki Ramaswamy, *aBellamkonda Prasanna Nagasai, aMaheshwar Dwivedy, Sudersanan Malarvizhi, Visvalingam Balasubramanian, Metallurgical Characteristics of AA6061 Aluminium and AZ31B Magnesium Dissimilar Joints by Fusion Welding Technique, Microscopy research and technique, 2024. DOI: 10.1002/JEMT.24510.
Corresponding Author: Bellamkonda Prasanna Nagasai

Collaborations

Dr. V. Balasubramanian, Professor & Director, Centre for Materials Joining & Research (CEMAJOR) Annamalai University, Annamalai Nagar-608002, Tamilnadu

Future Research Plans:

Planning to work on Fusion Welding (CMT, MIG, TIG, LASER, PLASMA and EBW) and Solid State Welding Processes (FSW, Rotary Friction Welding, Resistance Spot Welding, Magnetic Pulse Welding). Working on Additive Manufacturing (Wire Arc Additive Manufacturing on Metals, 3D Printing on Plastics), Cladding and Machinability. Characterisation, Tribology, and Corrosion. Steels and alloys, Aluminum, Nickel and Titanium Alloys.

The Department of Chemistry at SRM University-AP has taken a significant initiative by organising an International Conference on “Emerging Trends in Supramolecular Science and Technology” (ETSST-2024) on March 07 and 08, 2024. This two-day conference brought together some of the most renowned and accomplished national and international intellectuals in the field of chemistry, who will share their insights and expertise on the latest advancements, emerging trends, and future prospects in the domain of supramolecular science and technology. The conference promises to be a great platform for researchers, scientists, academicians, and students to exchange ideas, network, and collaborate towards making breakthrough contributions in the field.

The conference marked the presence of academic stalwarts from institutes of national and international repute who expounded on the relevance of the conference and discoursed upon the various topics.

The event also featured the unveiling of the abstract book compiled by the department. Vice Chancellor, Prof. Manoj K Arora; Registrar, Dr R Premkumar; the Associate Dean- Science, Prof. Jayaseelan Murugaiyan; Chairman and Convenor ETSST-2024, Prof. C Pulla Rao; HoD- Chemistry, Dr Pardha Saradhi Maram; Dr Seema Rani and Dr Balaji Babu, Assistant Professors, Department of Chemistry, SRM AP bore witness to this momentous occasion.

At its core, the essence of this conference lay in its audacious objective – to unravel the enigmatic world of supramolecular science, where chemistry transcends the boundaries of individual molecules. It is a domain where complexity breeds innovation, and practical applications pave the way for unprecedented advancements in engineering and technology.

As the curtains drew to a close on this grand spectacle, the echoes of inspiration and collaboration continued to reverberate within the hearts and minds of all who were part of this transformative experience. The bonds forged and the knowledge shared during ETSST-2024 will forever shape the trajectory of supramolecular science and technology.

The Department of Computer Science and Engineering is pleased to announce an extraordinary research paper titled “A Deep Transfer Learning Model for Green Environment Security Analysis in Smart City“, authored by Dr Sambit Kumar Mishra, Assistant Professor, was published in the Journal of King Saud University – Computer and Information Sciences that falls within the Q1 quartile with an Impact Factor (IF) of 6.9. The study introduces a model to automatically classify high-resolution scene images for environmental conservation in smart cities. By enhancing the training dataset with spatial patterns, the model improves green resource management and personalised services. It also demonstrates the effectiveness of LULC classification in smart city environments using transfer learning. Data augmentation techniques improve model performance, and optimisation methods enhance efficiency, contributing to better environmental management.

Abstract

The research addresses the importance of green environmental security in smart cities and proposes a morphologically augmented fine-tuned DenseNet121 (MAFDN) model for Land Use and Land Cover (LULC) classification. This model aims to automate the categorisation of high spatial resolution scene images to facilitate green resource management and personalised services.

Dr Mishra collaborated with Dr Rasmita Dash and Madhusmita Sahu from SoA Deemed to be University, India, as well as Mamoona Humayun, Majed Alfayad, and Mohammed Assiri from universities in Saudi Arabia.

His plans include optimising the model using pruning methods to create lightweight scene classification models for resolving challenges in LULC datasets.

Link to the article

A translated work must retain the essence and flavour of regional culture and locales. A good translator tries to reproduce the particularities that are ingrained within the texts. On this note, Dr Bidisha Pal, Assistant Professor from the Department of Literature and Languages, has published a paper, “Delving into a Translator’s Journey of Translating Marginalised Voices of Bengal: An Insightful Discussion with V Ramaswamy” in Meta Journal des traducteurs Translators’ Journal. This research revolves around a discussion with the well-known translator V Ramaswamy, a noted name in Bengali Dalit literature and translation. Ramaswamy shares his thoughts on working on the translation projects that he enjoys doing and that establish the cause of the marginalised people of Bengal.

Abstract

In this interview discussion with Bidisha Pal and Md. Mojibur Rahman, translator V Ramaswamy focuses on the journey of his translation and tryst with the marginalised Dalit voice(s) in Bengal. He speaks about the writings that propel him to choose translating and to carry voice(s) beyond the Bengal arena, thus dissolving language barriers. The deliberate choice to translate various pieces representing various periods acts as a witness to his existence as an independent translator. According to him, translation is also a source of healing to deal with a tragic past and the complicacies that life often presents to him. He shares his experience translating Subimal Mishra, the powerful poet who speaks for marginalised people. Ramaswamy, as he states in the interview, makes a vow to translate Mishra’s whole writing career. He talks about translating Manoranjan Byapari, a Bengali Dalit prize-winning author and political persona who has also championed the Dalit cause in Bengal, Adhir Biswas, the story-writer and publisher of a publishing house in Kolkata Gangchil that publishes writings by those literary personas who do not fall, as such, into the category of the mainstream, Bangladeshi writer Shahidul Zahir whose revolutionary voice and zeal reverberate in the literary world of Bangladesh, as well as Ansaruddin, a writer and farmer by profession whose works Ramaswamy is currently translating. Despite not being a part of the literary world, Ramaswamy has built an intense connection with literature and has gradually become part of the world. For him, translation is something that has to remain faithful to the source text, especially if people are doing literary translation.

Practical implementation/social implications of the research

The research contains elements that are connected with the values of the society. It discusses the nuances of translation of the writings of marginalised people, which contain many unforeseen truths of society, and depicts the struggles for the existence of the people. The translator is doing a commendable job compiling the writing thorough translation that will act as a bridge to the unfamiliar audience who could feel connected with the marginalised people.

Dr Bidisha aims to publish many more articles in the diverse interdisciplinary fields of literature, edit books, and attend conferences.

Link to the article

Mindfulness has emerged as a pivotal aspect in the domain of mental health, especially in the context of children and adolescents’ well-being. It refers to an inherent ability to be fully present in the moment, enabling an individual to gain an acute sense of awareness without any biases. Such a state of mindfulness empowers individuals to navigate the ups and downs of life with clarity and composure. Dr M Dhamodharan, an Assistant Professor in the Department of Psychology, has published a book chapter titled “Mindfulness for Child and Adolescent Well-Being: A Comprehensive Exploration of Strategies and Outcomes,” where he has comprehensively explored the intricacies of mindfulness and its impact on children and adolescents.

Here’s an abstract of the chapter published in the book, “Promoting Mindfulness and Well-Being with Indian Psychology.”

About the book chapter

The chapter examines the significant impact of mindfulness on children and adolescents. Mindfulness is the mental state defined by greater concentration, consciousness, and focus on the here and now, free from judgment. This chapter starts with the theoretical background of mindfulness and the current developments of mindfulness related to children’s and adolescents’ wellbeing. There are three main domains focused on mindfulness. Begin with emotional domains—that explains how mindfulness helps to regulate emotions. Secondly, cognitive domains explain how mindfulness practices help cognitive development and academic performance in educational settings. Thirdly, social and interpersonal domains explain the uses of mindfulness to improve social skills and interpersonal relationships with peer groups, family, and society. The chapter concludes with the role of parental and educational institutions in promoting mindfulness among children and adolescents to create a positive impact on their lives.

Dr Dhamodharan’s book chapter is targeted at Educators, parents, counsellors, and mental health specialists who stand to gain invaluable insights from the exploration of mindfulness within these pages.

Link to the book chapter

Link to the book

In a significant academic accomplishment, Dr Ramanjaneya Reddy, Assistant Professor in the Department of Electrical and Electronics Engineering, along with UG students Ms Mehataj Syed and Mr Busam Gopichand, have recently published a groundbreaking paper titled “A Three Leg Asymmetrical Voltage Resonant Converter with Independent Dimming Control for Multiple Load LED Lighting Applications” in the esteemed Q1 journal IEEE Transactions on Industry Applications. The journal boasts an impressive impact factor of 4.4, further underscoring the importance of this research contribution.

The paper delves into the development of a novel Three Leg Asymmetrical Voltage Resonant Converter that offers independent dimming control for multiple load LED lighting applications. This innovation holds great promise for enhancing the efficiency and versatility of LED lighting systems, paving the way for more sustainable and adaptable lighting solutions in various industrial applications.

Dr Ramanjaneya Reddy’s leadership and the collaborative efforts of Ms Mehataj Syed and Mr Busam Gopichand have culminated in this significant publication, which not only adds to the body of knowledge in the field but also showcases the talent and dedication of the researchers at the department.

This achievement highlights the commitment to excellence and innovation within the Department of Electrical and Electronics Engineering, positioning it as a hub for cutting-edge research and academic prowess. The impact of this research is expected to reverberate across the industry, contributing to advancements in LED lighting technology and its applications.

The publication of this paper underscores the quality and rigour of the research solidifying their reputation as leaders in the field. This accomplishment is a testament to the department’s commitment to pushing boundaries and making meaningful contributions to the field of electrical engineering.

Congratulations to Dr Ramanjaneya Reddy, Ms Mehataj Syed, and Mr Busam Gopichand on this remarkable achievement, and we look forward to seeing the continued impact of their research in the field.

Abstract

This work proposes a three-leg asymmetrical voltage resonant converter for multiple load Light Emitting Diode (LED) lighting applications. The proposed converter is developed with a common leg-1 for both load-1 and load-2. The load-1 is powered from asymmetrical voltage between leg-1 and leg-2. Similarly, load-2 is powered from asymmetrical voltage between leg-1 and leg-3. The proposed circuit provides the following major contributions: (1) Independent dimming control of LED loads; (2) Zero Voltage Switching (ZVS) of all power switches; (3) High efficiency; and (4) Asymmetrical voltage regulation. To achieve independent dimming control, the voltages between legs are made zero by dimming leg-2 and leg-3 independently. Two resonant circuits are connected in the proposed circuit. Owing to this all the power switches operate with ZVS, which reduces the switching losses. Further, two LED lamps are connected in series with battery sources to supply the threshold voltage to lamps which in turn results in a lower power processing of the converter.

Explanation of Research in Layperson’s Terms

This work proposes a three-leg asymmetrical voltage resonant converter with independent dimming control for multiple load LED lighting applications. The proposed converter drives multiple loads independently with a dimming feature. The converter is developed with leg-1 is common for both LED loads. The major contributions of the proposed LED driver are independent dimming control, asymmetrical voltage regulation, zero voltage switching of all the power switches, and high efficiency. The threshold voltage of LED loads is supplied by batteries connected in series with LED loads, which will help in lower power processing of the proposed converter. Further, due to soft switching technology implemented in this converter, it reduces the losses in the system considerably increasing efficiency.

Title of Research Paper in the Citation Format

A Three Leg Asymmetrical Voltage Resonant Converter with Independent Dimming Control for Multiple Load LED Lighting Applications.

Citation: Ramanjaneya Reddy Udumula, et. al, “A Three Leg Asymmetrical Voltage Resonant Converter with Independent Dimming Control for Multiple Load LED Lighting Applications,” IEEE Transactions on Industry Applications, Feb 2024. doi: 10.1109/TIA.2024.3363676

Practical and Social Implementation of Research

To achieve effective and efficient use of energy resources under the sustainable development goals, Light Emitting Diodes (LEDs) have emerged as a global lighting industry solution. Over the conventional lighting sources such as incandescent lamps, fluorescent lamps, and high intensity discharge lamps, LEDs are i) more efficient, ii) eco-friendly due to absence of toxic gases, iii) have longer life span up to one lakh year, iv) high luminous intensity and v) good colour rendering index. LED’s requires low voltage direct current supply and the V-I characteristics of LEDs which is like Shockley diode represents the exponential growth of current over a small voltage variation which may damage the LED or effects the illumination. Hence, an LED driver is necessary in an LED system to supply LEDs with constant current. DC fed LED drivers are more reliable due to absence of AC-DC conversion stage and power factor correction stage which are crucial in AC fed LED drivers. Therefore, DC fed LED drivers are paid more attention in recent times in the majority of battery-powered/solar-powered applications. Given its features of high power, exceptional efficiency, cost-effectiveness, and flicker-free operation, this innovation is well-suited for streetlight/stadium lighting applications.

Collaborations

Dr. Kasi Ramakrishna Reddy, Assistant Professor
Department of Electrical and Electronics Engineering, Vasavi College of Engineering, Hyderabad

Future Research Plans

The future work is on PV/battery fed LED driver topologies suitable for streetlighting/stadium lighting applications with low component count, high efficiency, reduced device stress, and flicker free lighting system

Electric Vehicles are in vogue today, thanks to the heightened environmental concerns, greater availability of models, increased cost competitiveness and improved vehicle ranges. To contribute to the growing field of electric vehicle technology, Assistant Professors, Dr Tarkeshwar Mahto, Dr Somesh Vinayak Tewari and Dr Ramanjaneya Reddy from the Department of Electrical and Electronics Engineering at SRM University-AP along with the research scholar, Ms K Mounika Nagabushanam, conducted a study and published a research paper titled “Development of High-Gain Switched-Capacitor Based Bi-Directional Converter for Electric Vehicle Applications.” The team’s research focuses on creating a bi-directional DC-DC converter that enables power flow from the battery to the motor and vice versa while maintaining necessary voltage gains and ensuring improved efficiency and low cost.

Abstract

High efficiency, high voltage transfer ratio (VTR), and low input ripple current are required in any bidirectional DC-DC converter (BDC) that plays a major role in interfacing batteries in applications like DC microgrids and electric vehicles (EVs). To meet these requirements, a switched capacitor-based BDC is proposed to interface the battery with a propulsion system via a DC Link. It has a simple circuit with only a set of switching operations, High VTR, and lesser ripple current on the low voltage (LV) side, which are advantages of the proposed High Gain Switched-Capacitor Bi-directional DC-DC Converter (SC-BDC), making it appropriate for use in EVs. The steady-state analysis, design consideration of passive components, loss and efficiency analysis are presented. Finally, the proposed High Gain SC-BDC is compared with a few of the existing BDCs in the literature. The feasibility of the converter was demonstrated by simulating a 200 W converter and validating results produced in a MATLAB environment.

Practical implementation of your research or the social implications associated with it.

The developed converter can be used in Electric Vehicle for integration of battery to traction motor.

Collaborations.

1. Majed A. Alotaibi, Department of Electrical Engineering, College of Engineering, King Saud University, 11421, Saudi Arabia.

2. Hasmat Malik, Department of Electrical Power Engineering, Faculty of Electrical Engineering, University Technology Malaysia (UTM), Johor Bahru 81310, Malaysia.

3. Fausto Pedro García Márquez, Ingenium Research Group, Universidad Castilla-La Mancha, 13071 Ciudad Real, Spain.

As part of their future research plans the team plans of working on noise reduction methods that are brought on by regeneration action and to incorporate various control techniques to keep the DC link voltage of the propulsion system constant.

We wish the team all success in their future endevours!

Link to the article