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Three-Component Convection in a Vertically Oscillating Oldroyd-B Fluid With Cross Effects
This paper sheds light on the impact of vertical oscillations (or gravity modulation) on triple-diffusive convection in a viscoelastic fluid using the Oldroyd-B model, in the presence of cross effects. Cross effects can significantly impact three-component convective systems, despite having small magnitudes. When the cross terms, indicating coupled molecular cross-diffusion of the mixture components, are included in the equations governing heat and species transport, then a deviation from the usual three-component convection process is observed. An analytical solution has been found using linear and nonlinear analysis. The conditions for the onset of convection have been obtained using the linear analysis, which is based on the perturbation technique and the Venezian method. In nonlinear analysis, the expressions for Nusselt and Sherwood numbers, which quantify the rate of heat and mass transport respectively, are obtained by deriving the Lorenz model. It has been found that the onset of convection and heat and mass transport can be controlled by choosing the appropriate values of the parameters. 2022, The Author(s), under exclusive licence to Springer Nature B.V. -
Three dimensional mixed convection flow of hybrid casson nanofluid past a non-linear stretching surface: A modified Buongiorno's model aspects
The purpose of this study is to determine the role of mixed convection, Brownian motion, and thermophoresis in the dynamics of Casson hybrid nanofluid in a bidirectional nonlinear stretching sheet. For the flow model, a combination of Tiwari and Das models, as well as Buongiornos model, is considered. The thermophysical characteristics of Gr, TiO2, and blood are employed. With the assistance of relevant similarity transformation, the describing flow equations of a Casson hybrid nanofluid model are reformed in the form of a system with a single independent variable. The solution for these equations is obtained using the RKF-45 approach. The velocity, temperature, and concentration fields are visually developed for both linear and non-linear stretching sheets, and the implications of the major parameters are presented in detail. It is clear from the current investigation that heat and mass transfer characteristics of fluid are better in the case of linear stretching than non-linear stretching. Furthermore, the mixed convection parameter is found to enhance the fluid flow velocity. However, the trend is quite opposite in the thermal and concentration fields. Meanwhile, the increase in the yield stress caused due to the rise in the Casson parameter decreases the flow velocity. 2021 Elsevier Ltd -
Three decades of advances in extraction and analytical techniques for guava (Psidium guajava L.): A review
Despite extensive experimental focus, there remains a notable gap in comprehending the progressive development of these techniques over time. This comprehensive review is dedicated to cataloging the evolution of extraction and analytical methods spanning several decades. In this article, we meticulously traced the development of analytical and extraction techniques. Additionally, we intricately map the periodic discovery of metabolites within guava fruit, aligning them with the chronological utilization of analytical methods. This article results from extensive research and literature analysis to bridge the knowledge gap. Our efforts highlight the advantageous phytochemicals in guava and the diverse extraction techniques available. By encompassing various facets of analytical methods and delving into metabolomics, this review can offer substantial benefits to cultivating future guava varieties. Subsequent sections within this review will serve as a valuable resource, aiding prospective researchers in identifying the most effective extraction and analytical methods for discovering novel metabolites in guava or similar biological samples. Furthermore, through a comprehensive timeline detailing methodological advancements, this review enhances our understanding of the evolutionary path of guava research. Such insights empower researchers to make informed decisions and actively contribute to the continual advancement of the field of research. 2024 -
Threats and security issues in smart city devices
The main objective of this chapter is to discuss various security and privacy issues in smart cities. The development of smart cities involves both the private and public sectors. The theoretical background is also discussed in future growth of smart city devices. Thus, the literature survey part discusses different smart devices and their working principle is elaborated. Cyber security and internet security play a major role in smart cities. The primary solution of smart city security issues is to find some encryption methods. The symmetric and asymmetric encryption algorithm is analyzed and given some comparative statement. The final section discusses some possible ways to solve smart city security issues. This chapter showcases the security issues and solutions for smart city devices. 2022, IGI Global. -
Threat Intelligence Model to Secure IoT Based Body Area Network and Prosthetic Sensors
This research work proposes a threat intelligence model for Internet-of-Things (IoT) sensors-based Body Area Network (BAN). It is focused primarily to be used in healthcare monitoring of vital parameters of critically ill patients and on the contrary performance measurement system for healthy sportspersons. The end-point control based applications are growing enormously with the advent of IoT based sensors and actuators being used in intelligent real-time systems. At the same time, it is expected to keep the ecosystem safe for the user while delivering the constant updates. However, the process for the monitoring health and wellness parameters of a patient, or measuring endurance and performance of a sportsperson, it remains vulnerable without a secure environment. Using the proposed model, the entire healthcare ecosystem may be designed for the personalized medication of a patient who are using sophisticated life-saving device like prosthetic heart valve or an elderly person dependent on medical-aided ambulatory devices or a sportsperson on performance measurement system. The Electrochemical Society -
This is My Story: Role of Tibet Museum in Preserving Memory in Exile
Tibetans, driven out of their homeland, have been living a life of exile since 1959. As they grapple with the challenges of preserving, shaping, transferring, and negotiating collective and cultural memories of a distant homeland, the role of the Tibet Museum at Dharamshala, Himachal Pradesh (the seat of the Tibetan government in exile) is pivotal. This chapter stems from an interest in understanding how the Museum serves aswhat Pierre Nora referred to asa site of memory for the Tibetans in exile to preserve the intergenerational memory. It tries to bring together the concepts of exile, culture, memory, and the institution of Tibet Museum to locate how it becomes a site of memory. How do the 9000-square-foot museum's permanent and temporary exhibitions institutionalise the memory of the imagined nation in exile? Of particular focus is the permanent exhibition titled I am a Tibetan, This is My Story housed at the Museum. 2025 The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. -
Thinking Beyond Empowerment : Understanding Autonomy in the Context of Kudumbashree
The concepts empowerment, agency and autonomy have gained a wider range of attention in newlinethe developmental research regimes. Amidst the conceptual drift these concepts are used newlineinterchangeably leading to uncertainty and proliferated meanings. The process of newlineempowerment may not always lead to autonomy. Through an ethnography of Kudumbashree, newlinean SHG in the South Indian state of Kerala, the current research focuses on how these women exercise agency to trouble the conventional boundaries between empowerment and autonomy. The transition of agency from the economic to the political domain is a subtle enterprise and is mediated by a number of factors including economic independence, decision making capability, mobility and political participation. Social - economic - political and cultural implications of women empowerment could be the first step in challenging and overcoming the relations of oppression in any society. The stereotypical assumptions can be negotiated by solely apportioning responsibilities and re-engaging with the system through everyday practices. The nuances of empowered women s re-engagement with local power regimes lead newlineto changes at the conceptual level that cuts beyond the individual and group level material transformations. The study figures how autonomy is a mediated process that is both agentic and subversive to the local patriarchal structures. -
Think Big with Big Data: Finding Appropriate Big Data Strategies for Corporate Cultures
The aim of this research is to learn how big data strategies (BDS) as a corporate culture might improve confidence and cooperative performance across civil and defence sectors involved in disaster relief activities. The research conceptualized a unique conceptual framework to demonstrate, employing the competitive value model (CVM), how BDS influences swift confidence (SC) and cooperative performance (CP) beneath the moderating impact of the corporate culture. The findings have four significant consequences. Initially, the BDS has a strong beneficial influence on SC and CP. Secondly, neither adaptable orientation (AO) nor regulated orientation (RO) had any effect on constructing SC. Thirdly, AO has a strong and beneficial moderating influence on the path connecting BDS and CP. As a result, RO shows a considerable negative moderating impact on the path linking BDS and CP. 2024 selection and editorial matter, Prof. (Dr.) Dorota Jelonek, Prof. (Dr.) Narendra Kumar, Prof. (Dr.) Mamta Chahar, Prof. (Dr.) Rusudan Kinkladze and Prof. (Dr.) Lilla Knop; individual chapters, the contributors. -
Thickness dependent tungsten trioxide thin films deposited using DC magnetron sputtering for electrochromic applications
DC magnetron sputtering was used to grow tungsten oxide (WO3) thin films on FTO and corning substrates. SEM, XRD, Electrochemical Analyzer, and UVVis Spectrometer were used to analyze surface morphology, structural properties, electrochromic characteristics, and optical characteristics. At an 800 nm wavelength, a decrease in thin-film thickness increased optical transmittance from 87 % to 95 %. Furthermore, coloring efficiency was observed to vary with the thickness of thin films for both 500 nm and 375 nm are 10.34 cm2 C-1 to 18.57 cm2 C-1. In comparison to the high-thickness thin film, the lesser-thickness deposited nano-thin film has a higher diffusion coefficient. At 8 10-4 mbar partial pressure, the diffusion coefficients for the smaller and the high-thickness thin film are 7.28x10-14 cm2s?1 and 6.0x10-14 cm2s?1, respectively. The diffusion coefficient and coloring efficiency have been found to have a considerable influence on the thickness and surface-to-volume ratio, which could be important in electrochromic applications. 2022 -
Thermosensitive In-situ gel based on halloysite nanotube/chitosan for site-specific delivery of aceclofenac
Periodontitis, a severe and chronic inflammatory gum disease, necessitates the development of advanced drug delivery strategies due to the limitations of conventional therapies, such as rapid drug clearance and inadequate site-specific retention. This study addresses these challenges by formulating and evaluating a novel aceclofenac-loaded halloysite nanotube (HNT) In-situ gel designed for effective local treatment of periodontitis. Aceclofenac, a non-steroidal anti-inflammatory drug (NSAID) known for its potent anti-inflammatory action and reduced gastrointestinal side effects, was encapsulated within HNTs to achieve sustained drug release and enhanced therapeutic efficacy. These drug-loaded HNTs were subsequently incorporated into a thermosensitive In-situ gelling system composed of medium molecular weight chitosan, sodium bicarbonate, and sodium ?-glycerophosphate. This gel formulation demonstrated favourable properties, including syringeability, swelling capacity, and temperature-responsive gelation at physiological conditions. The comprehensive characterization techniques such as FTIR, SEM, TEM, PXRD, DSC/TGA, confirmed successful drug encapsulation, structural stability, and uniform distribution within the gel matrix. The in vitro release studies revealed a sustained drug release profile, following zero-order and KorsmeyerPeppas kinetics, indicative of a Super Case-II transport mechanism. This novel, thermoresponsive local drug delivery system shows strong potential to improve the clinical management of periodontitis by providing prolonged therapeutic action, targeted delivery, and improved patient compliance. 2026 American Pharmacists Association. -
Thermorheological effect on RayleighBard magnetoconvection in a biviscous Bingham fluid with rough boundary condition on velocity and Robin boundary condition on temperature
The thermorheological effect on the onset of RayleighBard convection in a biviscous Bingham fluid in the presence of a horizontal magnetic field is investigated considering rough boundary conditions on velocity and Robin boundary conditions on temperature. The viscosity of the electrically conducting fluid is assumed to be sensitive to temperature variation. Linear and global nonlinear stability analyses are performed using the Chebyshev pseudospectral method to determine the existence of instability or otherwise. A general interpretation is made from the results to show the effects of the magnetic field and the variable viscosity on the system's stability. The biviscous Bingham parameter and the Chandrasekhar number are shown to have a delay in the onset of convection, while the effect of temperature sensitivity is to advance the onset. It is found that the results of linear and global nonlinear stability are not in agreement, so the region of subcritical instability exists. Also, the results obtained for RayleighBard convection agree pretty well with those of Platten and Legros and Siddheshwar et al. for the limiting cases. 2023 Wiley Periodicals LLC. -
Thermorheological and magnetorheological effects on Marangoni-Ferroconvection with internal heat generation
Marangoni convectiveinstability in a ferromagnetic fluid layer in the presence of a spatial heat sourceand viscosity variation is examined by means of the classical linear stability analysis. The higher order Rayleigh-Ritz technique is used to compute the critical Marangoni number. The effective viscosity of the ferromagnetic liquid is taken to be a quadratic function of both the temperature and magnetic field strength. It is shown that the ferromagnetic fluid is significantly influenced by the effect of viscosity variation and is more prone to instability in the presence of heat source compared to that when viscosity is constant. On comparing the corresponding results of heat source and heat sink it is found that heat sink works in tandem with the effect of viscosity variation if magnetic field dependence of viscosity dominates over temperature dependence. If the temperature dependence of viscosity dominates, the effects of viscosity variation and heat sink are mutually antagonistic. Published under licence by IOP Publishing Ltd. -
Thermonuclear X-ray bursts across the eclipse transitions in the LMXBs EXO 0748?676 and XTE J1710?281
The primary radiation from thermonuclear X-ray bursts observed in the neutron star low-mass X-ray binary (LMXB) systems can interact with various parts of the binary system. This interaction gives rise to secondary radiation in different wavelength ranges, known as reprocessed emission. In eclipsing LMXBs, the reprocessed emission from the bursts can be examined during eclipses, as the primary emission is blocked and only the reprocessed emission is visible. We searched for bursts during eclipses in the archival RXTE data of the eclipsing LMXBs and found them in EXO 0748?676 and XTE J1710?281. In EXO 0748?676, seven bursts were found to occur near eclipse egress, with their tails extending beyond the eclipse, and one such burst was found for XTE J1710?281. We estimate the reprocessing fraction at orbital phases near eclipse egress by modelling the peculiar eclipse bursts detected in both systems, which have tails extending beyond the eclipses. We observe an increasing trend in reprocessing fraction as these eclipse bursts occur closer to the eclipse egress. We discuss the possibilities of reprocessing in the ablated wind from the companion star, the accretion disc, and the disc wind in EXO 0748?676 and XTE J1710?281. Additionally, we observe two decay components in the bursts in EXO 0748?676, which could suggest a complex composition of the accreting fuel. From the burst rise time-scales, we place an upper limit on the size of the reprocessing regions in both EXO 0748?676 and XTE J1710?281, finding it comparable to the size of the respective X-ray binaries. The Author(s) 2025. Published by Oxford University Press on behalf of Royal Astronomical Society. -
Thermomechanical and viscoelastic properties of biodegradable and biocompatible polymer nanocomposites
Due to the ongoing depletion of fossil fuels, which have been the primary sources of monomers from which the vast majority of synthetic polymers are derived, biodegradable and biocompatible polymeric composites (BBPCs) have received a great deal of attention in recent years. The use of biodegradable and biocompatible polymers is expanding due to their ability to reduce toxic and nondegradable waste materials. Traditional polymers such as polypropylene, polyethylene, and polystyrene are nonbiodegradable, making reuse and recycling difficult. As a result, massive amounts of nonbiodegradable waste are generated all over the world. Biodegradable polymers have been widely used in medical and packaging applications because they are typically made from renewable materials that biodegrade when discarded. Producing biodegradable composites with the addition of environmentally friendly nanofillers is increasingly being regarded as the next-generation materials for improving some of the properties and performance of biodegradable polymers. Despite growing interest in biodegradable and biocompatible polymer research, most studies focus on their preparation methodologies and characterization, with little attention paid to their thermo-mechanical and viscoelastic behavior. Thus, the potential of biodegradable and biocompatible polymer nanocomposites under various thermo-mechanical conditions, as well as their viscoelastic behavior, is reviewed in this chapter. 2023 Elsevier Inc. All rights reserved. -
Thermomechanical Analysis of Cutting Tool Used for Minimizing Tool Wear During Machining of Inconel 718
During the CNC machining process, high stresses and temperatures are created at the cutting edge during machining of Inconel 718 due to severe tool wear. Inconel 718, one of the most often used Ni alloys, has a low machinability. Hence, determination of proper cutting tool to minimize tool wear and reduce surface roughness becomes an important aspect. Considering the scenario, the model-ling of dry turning of Inconel 718, a 3-Dimensional (3D) numerical model based on Finite Element (FE) is used. Turning tests were used to validate the model. The main wear modes that were dis-covered experimentally (chipping, notching, and built up edge BUE) were linked to variables predicted by the computational model, such as temperature and plastic strain at the chip. In this study, response surface methodology is used to design four features, matrix for a flexible composite design consisting of 5 repetitive levels; planning, implementation, implementation and development of mathematical models. Medium cutting strength is determined by the different feed values in the tangential, radial, and axial directions during the tooth by maintaining immersion and axial depth of the cut as constant. A comparison is shown between modeling and experimentation. In this paper, the principal stress and displacement strain has been seen at the tool-work interface region of three cutting tools during machining Inconel 718. Three directions i.e tangential, radial, and axial directions these stress and displacement has been applied to observe the changes and determine the selection of the suitable cutting tool for optimal machining conditions and parameter selection. It is observed that titanium cutting tool can prove to be a better tool to be used for machining Inconel 718 for longer tool life and improve productivity. Major Findings: The principal stress and Von-Mises stress in the thermomechanical analysis during Machining of Inconel 718 is found to be less in titanium cutting tool. This is the most suitable tool that can be used for machining hard to cut material Inconel 718. 2025, Informatics Publishing Limited. All rights reserved. -
Thermoluminescence glow curve analysis and trap parameters calculation of UV-induced La2Zr2O7 phosphor doped with gadolinium
Thermoluminescence (TL) glow curve analysis and calculation of trap parameters are reported for gadolinium (Gd3+)-doped La2Zr2O7 (LZO) phosphor. Phosphors were prepared by modified solid-state reaction method with varying concentration of Gd3+ (0.12.5mol%) including proper calcination and sintering temperature. Structural analysis of prepared phosphor for optimized TL concentration was recorded by X-ray diffraction analysis technique. Morphology was analyzed by scanning electron microscopic technique. The UV ray induced to the phosphor and effect of dose response recorded for variable dose rates of UV and TL glow curve were observed. The experimental and theoretical comparison was done by computerized glow curve deconvolution technique which determines the trap parameters such as trap depth, order of kinetics, and frequency factor for optimized concentration of dopant. The trap parameters and trap model are discussed in detail. 2019, Springer Science+Business Media, LLC, part of Springer Nature. -
Thermoluminescence (TL) studies of quartz sample collected from Meghalaya for radiation dosimetry
This study focuses on the investigation of the TL behavior of the quartz sample that was collected from Khonglah, West Jaintia Hills District in Meghalaya. The sample was crushed into powdered sizes (10100 m) and heated to reset the trap structures prior to irradiation. Characterization techniques, such as XRD and EDS, were performed to analyze the structure and elemental composition of the prepared sample. The sample shows a trigonal structure with a hexagonal lattice arrangement. Intrinsic defects and impurity centers, such as Al, Mg, and Mn, were present in the sample. TL glow curve analysis was performed after gamma irradiation with different doses (1070 Gy). With a gamma dose of 50 Gy, the sample showed a well-resolved glow curve with four intense peaks at 201C, 238C, 302C and 350C. Deconvolution of the peaks was done by using CGCD software and calculation of different trap parameters like the order of kinetics (b), activation energy (E), and the frequency factors (s) of the fitted glow curve was performed by Peaks shape method. These results suggested that natural quartz from Meghalaya exhibits promising dosimetric characteristics due to its good TL response with gamma dose and can serve as a reliable and cost-effective material for personal and environmental radiation monitoring. 2026 Informa UK Limited, trading as Taylor & Francis Group. -
Thermoelectric effects in graphene
Graphene, owing to its unique electronic properties, has become one of the active areas of condensed matter research with promising applications in future efficient thermoelectric (TE) and energy storage devices. The present work reviews the status of thermoelectric power (TEP) of graphene systems, including single-layer, bilayer, and nanoribbons. The theory of TEP, based on the Boltzmann transport formalism in 2D systems, is given. An analysis of the experimental data, in terms of the diffusion and the phonon-drag contributions to TEP, with regard to the various scattering mechanisms operative in graphene systems, is presented. The outlook on TEP for better understanding of the TE properties of graphene is discussed. 2016 by Taylor and Francis Group, LLC. -
Thermoelectric effects in graphene
Graphene, owing to its unique electronic properties, has become one of the active areas of condensed matter research with promising applications in future efficient thermoelectric (TE) and energy storage devices. The present work reviews the status of thermoelectric power (TEP) of graphene systems, including single-layer, bilayer, and nanoribbons. The theory of TEP, based on the Boltzmann transport formalism in 2D systems, is given. An analysis of the experimental data, in terms of the diffusion and the phonon-drag contributions to TEP, with regard to the various scattering mechanisms operative in graphene systems, is presented. The outlook on TEP for better understanding of the TE properties of graphene is discussed. 2016 by Taylor & Francis Group, LLC. All rights reserved. -
Thermodynamic Modeling of Hashtag Dynamics for Social Media Clustering: A Maxwell-Boltzmann Approach
Social media hashtags function as critical organizational markers in digital discourse, yet traditional weighting methods fail to capture their dynamic significance across temporal and contextual dimensions. This paper presents a novel thermodynamic framework that conceptualizes social network activity as system 'temperature', applying statistical mechanics principles to model hashtag importance as process innovation. We establish mathematical foundations based on the Maxwell-Boltzmann distribution, providing an information-theoretic justification for dynamic hashtag weighting. Our approach incorporates activation thresholds and power-law scaling behaviors through a temperature-dependent function, with Simple Moving Average techniques implemented to stabilize temperature estimation, mathematically reducing variance by a factor of 1/N. Empirical evaluation using Twitter discourse from the US Presidential Election demonstrates unprecedented improvements in clustering performance: Silhouette Scores increased from 0.0126 to 0.9070 for Trump-related content and from 0.0105 to 0.8220 for Biden-related content, while Calinski-Harabasz Scores improved from 65.51 to nearly 98 million. These findings establish a rigorous mathematical bridge between thermodynamic systems and social media behavior, contributing to computational social science by providing a theoretical framework that significantly enhances discourse community detection in politically polarized environments. The approach enables more accurate identification of topic clusters, revealing distinct discourse patterns that conventional methods fail to capture. 2025 The Authors.