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Rare-earth-activated phosphor for laser lighting
The chapter describes that Y2Ba3B4O12 doped with europium ions were synthesized by a modified conventional solid-state reaction method. The formations of the phosphor crystal structure are confirmed via the X-ray diffraction technique. The luminescence measurement upon excitation in ultraviolet and emission in visible range shows the characteristics of Eu3+ excitation and emission. The occurrence of the charge transfer band is explained in detail. The emission spectrum of Eu3+ ions consists mainly of several groups of lines in the 550-725nm region, due to the transitions from the 5D0 level to the levels 7FJ (J=0, 1, 2, 3, 4) of Eu3+ ions. The phenomena of concentration quenching are explained on the basis of electron-phonon coupling and multipolar interaction. The purity of the red emission is also checked, and it makes Eu3+-doped poly-borate-based phosphor as a promising candidate for laser lighting application. 2022 Elsevier Inc. All rights reserved. -
Analytical modeling of reconfigurable transistors
A functionally enhanced transistor is a potential candidate for further advancing electronics and Moore's law beyond the classical scaling. This chapter discusses these kinds of multifunctional transistors called reconfigurable field-effect transistor (RFET) and reconfigurable tunnel field-effect transistor (RTFET). The RFET works on the principle of Schottky barrier tunneling, and the RTFET works on the principle of band-to-band tunneling. Both devices can be configured as an n-type and p-type device based on the biasing. This chapter explains the working and performance comparison of RFET and RTFET in detail with the help of technology computer-aided design (TCAD) simulations. Further, the potential and current models of a single-gated RFET and double-gated RTFET are presented in this chapter. The presented analytical models are compared and verified with TCAD simulations. The potential in the channel regions of RFET and RTFET is modeled by solving a two-dimensional (2D) Poisson's equation. Because the working principle of both devices is different, two different formulas are utilized for modeling the current in the device. The current model for the RFET is developed by integrating Landauer's formula, whereas the current model for RTFET is obtained by integrating band-to-band generation rate over the tunneling volume. The procedure, technique, and assumptions followed to obtain the potential and current models of RFET and RTFET are detailed in this chapter. 2022 selection and editorial matter, Ashish Raman, Deep Shekhar and Naveen Kumar; individual chapters, the contributors. -
Charting Industry 4.0 Routes Incubation Centers: A Study on Atal Incubation Centre
Start-ups have garnered significant attention in India, as well as many other areas of the world, in the past few years. Start-ups may produce significant solutions through innovative and adaptable technology, acting as vehicles for socioeconomic growth and transformation. Some businesses were created in recent times, but the ecosystem was still in its infancy, with just a few investments and a limited number of support programs such as incubators. As business environments have evolved, there are signs that the function of incubators has shifted and extended to a center giving training, with over 20, 000 start-ups and a year-on-year growth rate of 10-12%, India boasts the worlds second largest start-up ecosystem. Since business settings have changed, there are indications that the purpose of incubators has moved and expanded to a center for training and support, connecting, and consulting to new enterprises in all fields of specialization rather than just a business center with office space. According to incubators, the major worry or problem was establishing suitable infrastructure with specialized technology that met the demands of the companies. In terms of investment, incubators were concerned about the schemes rigidity. Some incubators opted to extend financing or make grants rather than make equity investments. This issue originated largely from the regulatory complexities of incubators at educational institutions that make equity-based investments in businesses. Start-ups do not exist in isolation, but rather as a component of the larger economy. In terms of the regulatory framework, it is thought that enhancing the execution of existing start-up regulations and eliminating inefficiency within the administration is critical to making it easier for start-ups to do business. Start-ups would benefit from less paperwork and documentation, improved access to information, more standardized operational processes, and clear criteria. 2023 Taylor and Francis Group, LLC. -
Phytochemistry and Pharmacological Activities of Coriandrum sativum L.
Coriandrum sativum L. is a pharmaceutically significant herb that is used for culinary purposes and in herbal formulations. It is an annual herb from the family Apiaceae (Umbelliferae) with unique taxonomic characters. Generally called Dhania or kutumbari, it is cultivated worldwide for its distinct flavors and medicinal properties. Coriander is a rich reservoir of nutrients and significant biochemicals. The phenomenal healing properties of coriander can be attributed to the phytochemicals present in essential oils produced in various parts of the plants, such as leaves, flowers, fruit, and seed. The essential oils are rich in biochemicals like Linalool, (E)-2-decenal, 2-Decenoic acid, camphor, etc. These biomolecules altogether contribute to many pharmacological activities like analgesic, anticancer, anticonvulsant, antidiabetic, anthelmintic, antihypertensive, antimicrobial, anti-mutagenic, antioxidant, anxiolytic, diuretic, hypnotic activity. There are many scientifically proven reports to suggest its importance for usage. The present chapter summarizes the nutrition, biochemicals, and the scientifically proven pharmacological activities of Coriandrum sativum L as well as its cultivation and processing. 2022 by Nova Science Publishers, Inc. -
Lipase and lactic acid bacteria for biodegradation and bioremediation
Bioremediation is a biotechnological process in which environmental pollutants and solid wastes can be degraded using microbial action to provide a clean free environment without hazards. The process employs microorganisms such as bacteria and fungi for the degradation of wastes. The microbial activity in the bioremediation process degrades the environmental pollutants that are harmful to human health and converts them into less toxic or nontoxic forms. The process mainly focuses on the removal of many types of hazardous materials present in the soil, water, and atmosphere. Microorganisms, especially bacteria, receive great attention in bioremediation as they can mineralize the toxic wastes into other products, such as biomass and water, and make them nonhazardous at times. The activity is not limited only to the degradation of organic wastes, it also degrades crude oil spills in oceans, pesticides, and other industrial wastes. Lactic acid bacteria, Lactobacillus species are Gram-positive and occur mostly in milk and other such products that are highly useful for the human health. They also provide valuable products in the form of foodstuffs for human. Recent findings have shown that the lactic acid bacteria have a better capability to degrade most of the organic wastes and also other industrial contaminations such as dyes. Bioremediation process itself has different methods, such as biosparging and bioventing, grouped as ex situ methods, in which the degradation of wastes can be possible in bioreactors, while on the other hand, in situ methods take place at the site of the pollution or contamination by the microbial growth. 2022 Elsevier Inc. All rights reserved. -
Metal-Based Nanoparticles for Infectious Diseases and Therapeutics
Infectious diseases that are easily transmitted by microorganisms like bacteria, protozoa, fungus, etc. are a menace to humans. The greatest threat to human race is to mitigate the impact of these diseases. People with less immunity and children are prone to these diseases. Even healthy people get infected due to its easy transmission. Microorganisms causing these diseases are becoming more resistant to the drugs that are available in the market. So, there is a need to find new therapeutic which is facile, sensitive, and selective, is an important challenge for the medical field and this is where nanotechnology is having a greater chance. Nanoparticles especially metal-based nanoparticles have the ability to act against infectious and non-infectious diseases, this is because of their unique properties like small size, high surface area, etc. They do not have a specific binding site on the bacterial cell, which lead to the failure of bacterial resistant towards the nanoparticle mechanism. There are many nanoparticles which are efficient against particular diseases. In this review we are discussing about the advanced nanomaterials as therapeutics for infectious diseases. We have also discussed about antiviral activities which gives us a ray of hope for the solution of the SARS-COV-2. The Editor(s) (if applicable) and The Author(s), under exclusive licence to Springer Nature Singapore Pte Ltd. 2022. -
An Analysis of Sentiment Using Aspect-Based Perspective
Opinions play a major role in almost every human practice. Finding product and service reviews is made easy online. Product reviews are readily available in huge quantities. Considering each review and making a concise decision about a product is not feasible or even possible. Aspect-based sentiment analysis (ABSA) is one of the best solutions to this problem. Summary and online reviews analysis is delivered in this paper. ABSA has made extensive use of machine learning techniques. Recent years have seen deep learning take off due to the growth of computer processing power and digitalization. When applied to various deep learning techniques, numerous NLP tasks produced futuristic results. An overview of various deep learning models used in the field of ABSA is presented in this chapter after an introduction to ABSA. 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. -
Post-millennials: Psychosocial Characteristics, Determinants of Health and Well-Being, Preventive and Promotive Strategies
The post-millennial generation plays a significant role in the progress and development of every nation. The health and well-being of this generation needs critical focus. Post-millennial are unique, possesses an egalitarian worldview, global and open mind-set, commitment to the environment, society, and others. They are called digital natives due to their familiarity with social media and technology. They are also called snowflake generation due to their characteristics of being gentle and unique. Double income households and well-educated parents and their assistance make them a distinguished population. However, these characteristics are less explored while addressing the health and wellness concerns of this cohort. The present chapter discusses the psychosocial characteristics of the post-millennials and their implications exclusively in the mental health realm. It also presents the strength-based strategies to address the concerns of post-millennials and the significance of evidence-based practices in mental health and sensitizing mental health practitioners about the changing scenario. The Editor(s) (if applicable) and The Author(s), under exclusive license to Taylor and Francis Pte Ltd. 2022. -
Upskilling and Curating the Potentials of IoT Enabled Smart Cities: Use Cases and Implementation Strategies
The reason for opting the Internet of Things in the smart city system was to manage assets, resources and services efficiently and improve the operations across the city. This will be achieved by the inception of cognitive technologies, including the Internet of things (IOT). The IoT enabled Smart cities enables the utilities for improving transportation and accessibility, improve social services, promote sustainability, and give its citizens a voice. However, the barriers to smart cities are siloed, piecemeal implementations, growing expectations, uninformed citizens and shrinking budgets and little or no investment capital. Smart streetlights, lighting adapts to the activity on the street. Parking sensors provide real time information on an app where to find vacant parking spaces. Garbage sensors and automated waste collection are recent eras of smart cities. Overall it improves the operational efficiency and provides better quality of service. Thus, India thought of IoT enabled Smart cities which include housing, schools, offices and retail. In this paper, we examine significant aspects of an IoT infrastructure for smart cities, outlining the innovations implemented in the cities of India as use cases and Implementation Strategies. Exceptional attention is devoted to the potential applications of smart cities. 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG. -
Role of plant tissue culture medium components
The plant tissue culture technique is one of the most acquainted techniques and has been practiced since 1902 for the development of disease-free plants with desired quality, at a larger production rate within a short span of time, irrespective of the season. Each plant has its own morphology and nutritional requirements. Moreover, the nutritional requirement for the tissues in each part of the plant varies. Thus, for the optimal growth of the desired plant, the composition and choice of the suitable media are crucial factors. The formulation of the nutrient medium for the specific tissue and the specific plant plays a vital role in the development of suitable plant tissue culture techniques. This chapter discusses the main components of the plant tissue culture media: basic components which include macroelements, microelements, nitrogen sources (including amino acids), carbon sources, organic supplements (mainly vitamins and other supplements), growth regulators like auxins, cytokinins, gibberellins, abscisic acid, ethylene, and solidifying agents. The basic components have to be incorporated at a fixed concentration. The plant growth regulators are supplemented for organogenesis and the balance between the growth regulators depends on the type of tissue culture technique adopted. The additional supplements are incorporated into the media to achieve specific responses which include activated charcoal, antioxidants, ethylene inhibitors, and complex organic additives, and antibiotics/antifungal agents are supplemented to prevent plant loss due to contamination. The chapter also emphasizes the sterilization techniques and their importance in the plant tissue culture medium. The significance of the adoption of automated media preparation and incorporation of nanoparticles in the tissue culture media is also discussed. 2022 Elsevier Inc. All rights reserved. -
Microalgae: a promising tool for plastic degradation
The use of plastics in the present-day routine is an unavoidable part of human life. It is posing a global environmental threat due to its never-ending accumulation. Complete disposal of plastics is a major problem, and for their complete degradation an effective solution or method has not been discovered yet. However, in order to turn to a biological approach for coping with the ever-increasing fear of plastic aggregation and decay, the development of a methodology would be useful for posterity. To eliminate plastic wastes, two scenarios exist: produce biodegradable plastics from renewable materials or fossil fuels as building blocks, such as hydrobiodegradable/oxo-biodegradable; or find appropriate microalgae and their toxins for the development of a protocol to effectively biodegrade the plastics. Just as biodegradation of plastics is a constructive option, as they are eco-friendly with not much harm done to the environment, the development of biodegradable plastic is also equally effective. Some of the algae that are isolated from the plastic wastes are green-algae, blue-green algae, diatoms, etc. Polyethylene is basically carbon and hydrogen polymer, which is exceptionally resistant to biodegradation (less than 0.5% over 100 years), whose degradation is dependent mainly on moisture, light, and temperature. The most used types of plastics like polyethylene terephthalate and polypropylene are a major threat as they are used in the manufacture of bottles, fibers, packing materials, etc. The degradation or disposal of these plastics is leading to their conversion into microsized particles which is further leading to harm to the environment, mainly when these microplastics interact with microalgae like Spirulina. However, landfill, incineration, and chemical methods are some of the conventional methods for polyethylene disposal that are fatal to the environment as they cause hazardous effects on flora and fauna. 2022 Elsevier Inc. All rights reserved. -
Carbon dots as an effective material in enzyme immobilization for sensing applications
In carbon dots (CDs), both graphene quantum dots and carbon quantum dots were the latest entrants to the carbon family, all of which are spherical carbon nanoparticles of size <10nm. CDs have found their way in the various applications in the field of chemical sensing, biosensing, bioimaging, photocatalysis, nanomedicine, and electrocatalysis ever since their discovery. CDs provide interesting attributes to electrochemical and optical biosensing using enzyme biosensor due to they have desired advantages of biocompatibility, excellent physicochemical properties, high resistance to photo bleaching, intrinsic non/low-toxicity, high solubility, large specific surface area for the binding of enzymes, and low quantum yields, as well as their ability for modification with the attractive surface area. Surface active functional groups such as epoxide, hydroxyl(OH), and carboxylic acid (COOH) groups can be used for the immobilizing biomolecules on CDs. The enzyme immobilization is a process which is generally carried out by ionic/covalent interaction, encapsulation, and adsorption. The process of adsorption is considered to be a simple, effective, and economical method for enzyme immobilization. Thus enzymes immobilized on CDs have shown significant improvement in both activity and stability. This chapter aims to throw light on the progress and development of enzyme immobilization (e.g., laccase, bovine serum albumin, and horseradish peroxidase) in the CDs, which acts as a probe for sensing application, with laying emphasis on their synthesis along with the challenges faced in this exciting and promising field. 2023 Elsevier Inc. All rights reserved. -
Green Supply Chain Management: Attaining Sustainable Competitive Advantage
[No abstract available] -
Symbiotic cyanobacteria in gymnosperms
Cyanobacteria are a widespread group of phototrophic bacteria that are morphologically diverse and present on almost every environment on earth. Many cyanobacteria are able to fix atmospheric nitrogen and thus are able to form symbiotic association with a wide range of eukaryotic hosts such as plants, fungi, sponges, and protists. Cyanobacteria are able to provide carbon to nonphotosynthetic hosts such as fungi, but their primary role is to supply fixed nitrogen to enable the host to flourish in nitrogen poor environments. In turn, cyanobionts get the benefits of protection from competition, predation, and environmental extremes. Of all the cyanobacterial symbiotic associations, this chapter focuses on understanding the symbiotic association between gymnosperm and cyanobacteria. Species belonging to phylum cycadophyta are associated with nitrogen-fixing cyanobacteria (Nostoc species) through small specialized roots called coralloid roots. The cyanobionts are expected to have a heterotrophic mode of carbon nutrition, due to their location in coralloid roots (complete darkness). 2023 Elsevier Inc. All rights reserved. -
Impact of chitosan and chitosan-based nanoparticles on genetic transformation: an overview
Currently, the primary challenge to modern agricultural science is to meet the global demand for products and ensure food security for the growing population. No doubt the conventional plant breeding techniques and use of agrochemicals to obtain greater crop productivity and variety have been established to fight against biotic and abiotic stress in plants for better yield of agricultural products. The scientific community is exploring better techniques that can satisfy the need of mankind without affecting the ecosystem. Genetic engineering in plants is a recent advancement in the field of plant biotechnology and is more precise and can quickly obtain the desired trait in plants. This technology majorly focuses on improving the crop yield and quality by expressing desirable genes that are responsible for desirable traits such as tolerance to extreme conditions, herbicide, pest resistance, and enhanced secondary metabolite production, which is of medical importance. Nanomaterial-mediated genetic transformation is one reliable and efficient means of crop improvement for sustainable development in agricultural science. This technology has revolutionized modern agriculture as they are used as an effective delivery system to plants. Chitosan-based nanoparticles find their best application as nano-carrier due to their intrinsic properties such as cationic, biocompatible, high loading capacity, and good penetration potential with good release kinetics. Thus chitosan nanoparticles are used to deliver different types of genetic materials such as DNA, RNA, miRNA, siRNA, pDNA, CRISPR/Cas9 single guide RNA for plant transformation. This chapter provides an overview of chitosan nanoparticles as a delivery system and with a focus on their application as a safe genetic delivery system in plants. 2022 Elsevier Inc. All rights reserved. -
Application of Nanomaterials in Fuel Cell and Photovoltaic System
The emerging appliances and components of nanotechnology facilitate pioneering and cost-efficient strategies to meet the ever-growing energy demands. Employment of nanomaterials fetched innovative approaches for processing, storing, and exchange of energy owing to its nanosized and well-defined structure. This review presents an overview of the involvement of nanomaterials that made breakthroughs in the field of fuel cell and photovoltaic technologies. While the morphologies and unique dimensions of nanostructures offered novel electrolytes and high surface area for fuel cell catalysts; the probability of quick separation and collection of photogenerated charge carriers was enhanced in solar cells. This book chapter will focus on the recent research and developments for improving efficiency and lower device fabrication cost in nano-enabled fuel and solar cells. 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. -
Synthesis and physico-chemical characterization of ZnS-based green semiconductor: A review
One-dimensional (1D) semiconductor nanostructures have been attracting a great deal of attention because of their excellent electronic and optoelectronic performance. Zinc sulfide (ZnS) nanostructures have attracted increasing attention because of their potential application in both conditional optical devices and new generation of green nanostructure semiconductors because of their special structure-related physical and chemical properties. Synthetic form of ZnS can be transparent, and it is used as a window for visible optics, infrared optics, and functional materials. In this chapter, the detailed studies of synthesis, characterization of crystals, and noncrystalline behavior is reported. The crystal structure of semiconductor and its morphological studies are compared and fabrication methods will be described. The major parameters that influence on ZnS doped with metal ions and rare earth ions and its optoelectronic properties will be carefully analyzed. In addition, the primary application of ZnS micro- and nanocrystals will be described. At the end, the predicted future applications and development directions of doped and undoped ZnS nanocrystals will be given. 2023 Elsevier Ltd. All rights reserved. -
Impact of chitosan and chitosan nanoparticles on seed germination: probabilities and prospects
Agriculture is the science and practice of making plants and animals for the food for animals, and humans at large. It is used not only for food but also for other needs like wool, silk, leather, etc and now we start to use these agricultural practices for making plants and animals as bioreactors for making valuable pharmaceuticals. But, the main segment of agriculture is related to the cultivation of plants. Even though many types of plant propagation systems are available, the use of seeds is considered to be the most commonly used method in many crop varieties. The productivity of the crops is largely depending on healthy seedling production. There are many methods including the traditional methods to improve seedling development. Recent scientific developments help in the development of better seedlings and thereby the crop yield. Chitosan and its nanoparticles are being used in agriculture in different aspects starting from seed germination and seedling development apart from the use in controlled release of the nutrients. In the present chapter, the use of chitosan and chitosan nanoparticles in agriculture especially in the stages of seed germination and seedling development in different crop varieties is discussed. 2022 Elsevier Inc. All rights reserved. -
Impact of COVID-19 on Gig Workers with Special Reference to Food Delivery Executives
The gig economy, popularly known as shared economy or collaborative work, has acquired a public and academic interest in the twenty-first century. The concept stresses entering into short-term contracts and does not promise any permanent job. The employees in the Gig economy with temporary work relationships are also referred to as gig workers. Any unexpected change in the pulse of the economy has an impact on the gig economy. The COVID-19 pandemic has affected the economy and the gig workers over the last few months. This book chapter provides a timely intervention into the gig workers, particularly the food delivery executives in India. Their remunerations, benefits, and difficulties from a pandemic perspective are included in the chapter. The authors try to bring in the employees views of the work they do and the differences, which have been brought in as an aftermath of the pandemic. The chapter also throws light on the recent government initiatives to benefit gig workers in the economy. The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2022. -
COVID-19 and Mental Health of Indian Youth: Association with Background Variables and Stress
The coronavirus has become a public health concern of the decade, affecting the economic, social, and psychological stability of the whole world. Having understood the detrimental impact of the pandemic to the mental health of people of all age groups, youth is understood to be the most vulnerable population who receives its direct impact. The broad objective was to study the mental health status of Indian youth and its association with various demographic variables. Psychological stress and mental health was another relationship that was explored. A group of 317 participants between the age group of 19 to 29 voluntarily took part in the online survey. Gender was found to be associated with overall mental health status (p < 0.01) as well its correlates, namely anxiety (p < 0.05), depression (p < 0.05), and loss of behavioral control (p < 0.01). Association between age and loss of positive affect (p < 0.05), number of siblings and loss of behavioral control (p < 0.01), and family environment and overall mental health scores (p < 0.001) were found. Similarly, feeling of restlessness during lockdown (p < 0.001), availability of support (p < 0.001), and feeling the need to consult a mental health professional were associated with the overall mental health score as well as all its sub-scales. Further, there were strong negative correlations between psychological stress and overall mental health scores, as well as that of anxiety, depression, and loss of behavioral control and positive affect sub-scales. The study highlighted the need for psychological support services for the youth population of the country to cope with and adapt to the new situation. The Editor(s) (if applicable) and The Author(s), under exclusive license to Taylor and Francis Pte Ltd. 2022.