Shelby D. Hunt’s contributions to the marketing discipline: Research programs, impact, and compelling opportunities

Sreedhar Madhavaram 한국마케팅과학회 2021 마케팅과학연구 Vol.31 No.2

This issue of the Journal of Global Scholars of Marketing Science (JGSMS) is a tribute to the contributions of Shelby D. Hunt to the marketing discipline. There are nine contributions by – Dennis B. Arnett, Vishag Badrinrayanan, Kshitij Bhoumik, Pelin Bicen, Mayukh Dass, Linda Ferrell, O.C. Ferrell, Shelby D. Hunt, Sreedhar Madhavaram, Heejung Park, Mark Peterson, Rajan Vardarajan, and Scott J. Vitell – that not only pay homage to Professor Hunt’s significant contributions, but also make original contributions that can potentially take the marketing discipline forward. Collectively, the contributions from the special issue are unequivocal on the significance of Professor Hunt’s contributions to the marketing discipline with reference to: (i) theory development in marketing, (ii) programmatic research on marketing theory, marketings’ philosophy debates, channels of distribution, macromarketing and ethics, relationship marketing, resource-advantage theory, and marketing management and strategy, (iii) impact on the marketing discipline, (iv) implications for marketing scholarship, pedagogy, and practice, and (v) advancing the marketing discipline. In conclusion, on the foundations of Professor Hunt’s contributions to research on marketing theory, marketing strategy, marketing ethics, macromarketing, resource-advantage theory of competition, and channels of distribution, compelling opportunities are abound for marketing scholarship.

Analysis of Static and Dynamic Performance Characteristics of THD Journal Bearing Operating Under Lubricants Containing Nanoparticles

Sreedhar Babu Kalakada,Prabhakaran Nair Kumarapillai,Rajendrakumar Krishnan Perikinalil 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.

In this paper, the static and dynamic performance characteristics of journal bearing in terms of load capacity, attitude angle, end leakage, frictional force, threshold speed and damped frequency are presented when the bearing operating under lubricants, which contain nanoparticles and viscosity of these lubricants varies with temperature. The nanoparticles used for the present work are copper oxide (CuO), cerium oxide (CeO2) and aluminum oxide (Al2O3). Viscosity models for the lubricants are developed with the available experimental data. The modified Reynolds and energy equations are used to obtain pressure and temperature distribution across the lubricant film and these equations are solved by using the finite-element method and a direct iteration scheme. The static and dynamic performance characteristics of journal bearing are computed for various values of eccentricity ratios for isoviscous and thermoviscous lubricants. The computed results show that in isoviscous case, addition of nanoparticles does not change performance characteristics considerably but in thermoviscous case, changes are significant.

The conceptual contributions of Shelby D. Hunt: Foundations for advancing the marketing discipline

Sreedhar Madhavaram 한국마케팅과학회 2021 마케팅과학연구 Vol.31 No.2

Given that conceptual contributions are essential for enhancing marketing thought, scholars are increasingly lamenting the decline in conceptual advances in marketing. Remarkably, while the marketing discipline was experiencing a precipitous decline in conceptual advances, Professor Hunt, almost singularly, moved in the opposite direction through his significant conceptual contributions to several substantive areas in marketing. In this article, as a scholarly tribute, I evaluate some of his conceptual contributions to marketing theory, franchising, marketing ethics, marketing strategy, and competition. Specifically, this article (i) discusses the nature of conceptual contributions, (ii) evaluates Hunt’s conceptual contributions to five substantive areas in marketing using MacInnis’s typology for conceptual contributions, (iii) argues that Professor Hunt’s conceptual contributions are foundational for scholarly discourse on marketing theory, franchising, marketing ethics, marketing strategy, and competition, and (iv) urges marketing scholars to both develop conceptual contributions for substantive areas of marketing and to cumulatively build on the foundations of Professor Hunt’s conceptual contributions to specific research domains. Indeed, an appropriate tribute to a scholar’s intellectual contributions can only come from preserving the cumulativity of those contributions by building on their foundations.

Highly photostable Zn-doped TiO₂ thin film nanostructures for enhanced dye degradation deposited by sputtering method

Sreedhar, M.,Neelakanta Reddy, I.,Reddy, Ch. Venkata,Shim, Jaesool,Brijitta, J. Elsevier 2018 Materials science in semiconductor processing Vol.85 No.-

<P><B>Abstract</B></P> <P>Zn-doped TiO<SUB>2</SUB> thin films were deposited on glass substrates using the RF sputtering method with various Zn-dopant concentrations at a substrate temperature of 300 °C. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), UV–Vis spectroscopy, and X-ray photoelectron spectroscopy (XPS) were used to analyze the crystal structure, surface morphology, transmittance, elemental composition, oxidation states, and degradation of the prepared thin films. The anatase phase of TiO<SUB>2</SUB> was observed in the coated thin films. A maximum transmittance of ~77% and the lowest band gap of ~3.12 eV was achieved. The roughness of films increased with the Zn concentration, and a roughness of ~15.23 nm was observed. Photocatalytic degradation activity was tested using phenol red dye, and a maximum dye degradation of ~58% was achieved. In addition, no structural or surface chemical changes were seen in the thin film used for the photocatalytic activity, even after five cycles, which indicates that the films exhibit high photostability.</P>

Plasmonic Ag nanowires sensitized ZnO flake-like structures as a potential photoanode material for enhanced visible light water splitting activity

Sreedhar, Adem,Neelakanta Reddy, I.,Ta, Qui Thanh Hoai,Namgung, Gitae,Noh, Jin-Seo Elsevier 2019 Journal of Electroanalytical Chemistry Vol.832 No.-

<P><B>Abstract</B></P> <P>Silver nanowires (AgNWs) functionalized ZnO flake-like (ZnO/AgNWs) morphological heterostructures were developed as a promising photoanode by facile RF magnetron sputtering and polyol methods. Herein, we demonstrate the role of rationally tailored AgNWs weight concentration (0, 0.03, 0.05 and 0.07g) on ZnO flake-like morphology for enhanced visible-light-driven photoelectrochemical (PEC) water splitting activity. From XRD studies, ZnO (002) facets were effectively influenced by the selective growth of Ag (111) facets. Notably, XPS studies reveal the strong correlation between AgNWs and ZnO, showing a significant red shift in Zn 2p and O 1s levels and blue shift in Ag 3d level. Whereas, surface hydroxyl groups (OH<SUP>−</SUP>) were originated on ZnO/AgNWs heterostructure, which acts as light trapping states. Interestingly, FESEM images comprise AgNWs distribution on ZnO flake-like morphology, which suggests AgNWs are most accessible networks at the interface of ZnO. As a result, we observed significant variation in the optical transmittance and matching band gap for strong visible light absorption. In conclusion, selective growth of AgNWs-0.05g on ZnO promoted the strong interface reaction kinetics with impressive photoconversion efficiency (0.38%). Thus, developing of unique flake-like/nanowire morphological features underlined to be crucial interest in energy conversion applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Well-defined AgNWs based ZnO flake-like photoanodes reported for the first time. </LI> <LI> Surface interaction between AgNWs and ZnO serves as a key factor for PEC activity. </LI> <LI> Specific surface area of AgNWs achieved for superior visible light harvesting. </LI> <LI> ZnO/AgNWs (0.05g) photoanodes yielded 0.38% photoconversion efficiency. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Insight into anions and cations effect on charge carrier generation and transportation of flake-like Co-doped ZnO thin films for stable PEC water splitting activity

Sreedhar, Adem,Reddy, I. Neelakanta,Hoai Ta, Qui Thanh,Cho, Eunbin,Noh, Jin-Seo Elsevier 2019 Journal of Electroanalytical Chemistry Vol.855 No.-

<P><B>Abstract</B></P> <P>Developing a stable interface interaction between photoelectrode and electrolyte is crucial for achieving superior photoelectrochemical (PEC) water splitting activity. In this aspect, the contribution of anions and cations present in the electrolyte play a decisive role during its interaction with the solvent and surface functional groups on the developed photoelectrode, which greatly determine the charge carrier generation and transportation. Herein, we developed the flake-like Co (1.7 at.%)-doped ZnO (Co-ZnO) thin films by employing simultaneous RF and DC magnetron sputtering, which were post annealed at 250 °C for 2 h. The developed films were used to demonstrate the PEC activity under different aqueous electrolytes (KCl, KOH, NaOH, Na<SUB>2</SUB>SO<SUB>3</SUB> and Na<SUB>2</SUB>SO<SUB>4</SUB>). Most importantly, owing to the promising flake-like features of Co-ZnO, efficient electrode-electrolyte interface interaction has been achieved for stable and improved PEC activity. In turn, detailed PEC activity in KCl, KOH and NaOH electrolytes demonstrated that K<SUP>+</SUP> cations and OH<SUP>−</SUP> anions in KOH greatly influenced the photocurrents than KCl (Cl<SUP>−</SUP>) and NaOH (Na<SUP>+</SUP>) due to the high ionic conductive and diffusion properties. On the other hand, SO<SUB>3</SUB> <SUP>2−</SUP> (Na<SUB>2</SUB>SO<SUB>3</SUB>) anions tailor the charge carrier generation by the advantage of hole scavenging activity compared to SO<SUB>4</SUB> <SUP>2−</SUP> (Na<SUB>2</SUB>SO<SUB>4</SUB>). Comprehensively, our results provide new insight into the selection of aqueous electrolyte to improve the PEC water splitting activity through adopting the ionic conductivity and constructive interaction with photoelectrode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Flake-like Co (1.7 at.%)-doped ZnO thin films were deposited by RF and DC sputtering. </LI> <LI> Surface interface interaction between Co-ZnO and aqueous electrolytes was explored. </LI> <LI> Ion conductive and diffusion properties highlighted stable and superior PEC activity. </LI> <LI> Photocurrents in KOH (2.3 × 10<SUP>−6</SUP> A/cm<SUP>2</SUP>) > NaOH (2.0 × 10<SUP>−6</SUP> A/cm<SUP>2</SUP>) > KCl (8.7 × 10<SUP>−7</SUP> A/cm<SUP>2</SUP>). </LI> <LI> Na<SUB>2</SUB>SO<SUB>3</SUB> acts as a hole scavenger for superior PEC activity than Na<SUB>2</SUB>SO<SUB>4</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>This study comprehensively explores the anions and cations effect on charge carrier generation and transportation of flake-like Co (1.7 at.%)-doped ZnO thin films for stable PEC water splitting activity under various aqueous electrolytes.</P> <P>[DISPLAY OMISSION]</P>

Mass transfer analysis of ultrafiltration using spacers based on triply periodic minimal surfaces: Effects of spacer design, directionality and voidage

Sreedhar, Nurshaun,Thomas, Navya,Al-Ketan, Oraib,Rowshan, Reza,Hernandez, Hector H.,Abu Al-Rub, Rashid K.,Arafat, Hassan A. Elsevier 2018 Journal of membrane science Vol.561 No.-

<P><B>Abstract</B></P> <P>An ideal feed spacer balances high flux and low pressure drop while minimizing fouling. In this work, several feed spacer with complex triply periodic minimal surface (TPMS) geometries were designed and fabricated using additive manufacturing (AM) processing. AM technology was employed to vary the voidage and directionality of the spacers. The fabricated spacers were tested to determine their impact on mass transfer, pressure drop and critical flux in a flat-sheet ultrafiltration (UF) setup for protein separation in aqueous medium. Dimensionless numbers analysis was conducted with dextran filtration, while critical flux was determined via the flux-stepping method by filtration of bovine serum albumin (BSA). All the tested TPMS spacers displayed an increase in mass transfer compared to a commercial spacer design, with the Gyroid spacer (84% voidage) exhibiting a 67% increase in Sherwood number. The Gyroid design also showed an 8% improvement in critical flux. Modification of the spacer voidage and direction also showed significant influence on performance. By increasing the voidage of the Gyroid spacer from 84% to 90%, we observe a 97% increase in Sherwood Number and an 18% decrease in Power number, compared to commercial spacer. The findings of this study show the advantages of TPMS architectures as candidates for spacer design in UF.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spacers based on triply periodic minimal surfaces (TPMS) were made. </LI> <LI> Mass transfer study of TPMS spacers in ultrafiltration. </LI> <LI> Modification of directionality and porosity of TPMS spacers evaluated. </LI> <LI> Spacer with gradually changing porosity fabricated and tested. </LI> <LI> Superior critical flux using some TPMS architectures compared to commercial design. </LI> </UL> </P>

Versatile role of 2D Ti3C2 MXenes for advancements in the photodetector performance: A review

Adem Sreedhar,Qui Thanh Hoai Ta,Jin-Seo Noh 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-

Nowadays, layer-structured two-dimensional (2D) Ti3C2 MXenes have been created a platform as promisingcandidates for developing next-generation photodetectors. Scalable spatial organization of Ti3C2MXenes enables responsive template at the interface of various semiconductors for significant improvementin the photodetector performance. In this review, we provide prospective discussion on geometricalpotentiality of 2D Ti3C2 MXenes to advance the current photodetector device performance. Specifically,we guide the versatility of Ti3C2 MXenes such as a metal electrode, flexible material, transparent nature,and self-power behavior during UV, visible, and broadband photodetector performance. By the excellenceof 2D Ti3C2, we begin to comprehend the Schottky barrier, built-in electric field, and van der Walls heterojunctionformation. It is imperative to understand the vast opportunities of Ti3C2 MXene-based photodetectorseven under flexible conditions, which is higher than conventional gold and graphene. Owing tothe desirable properties, Ti3C2 garnered significant progress in (i) large-size flexible photodetector formationwithout altering the structural and charge carrier properties, (ii) replacing conventional metal electrodesby electrically conductive Ti3C2 in Ti3C2-semiconductor-Ti3C2 (MX-S-MX) photodetector, and (iii)Schottky junction formation at the interface of various semiconductors. Finally, we conclude the status of2D Ti3C2 MXene applicability, challenges, and possible viewpoints for advancement in next-generationphotodetectors.

Advancements in the photocatalytic activity of various bismuth-based semiconductor/Ti3C2 MXene interfaces for sustainable environmental management: A review

ADEM SREEDHAR,Qui Thanh Hoai Ta,노진서 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-

Rapidly increasing world population and industrialization are difficult to balance our environment. Monitoring water pollution, depletion of fossil fuels, and greenhouse gas emissions is paramount forthe safety of our ecological system. This review is intended to address the environmental monitoringapplications (toxic matter degradation, H2 evolution, CO2 reduction, and N2 reduction) through the possibleinterfacial insights involved between various bismuth (Bi) based semiconductors and 2D Ti3C2MXenes. In this spotlight, we explored strategic point contact (0D/2D) and face contact (2D/2D) interfaceinformation towards superior charge carrier generation, separation, and shortened charge transfer pathunder suppressed recombination. Considering the diverse morphological advancements in Ti3C2 (multilayer,monolayer, QDs, and completely derived C-TiO2), unique interfacial charge transport mechanismswere revealed. Band alignment modulations distinguishably functionalized the charge carrier separationand its participation in photocatalytic activity. With the control on face contact 2D/2D interface, abundantsurface-active sites promoted toxic dye degradation, CO2, and N2 reduction. Overall, this reviewdescribed the concept of advancements in surface interfacial interaction. Finally, challenges and perspectiveson future research are also provided.

Critical dynamics of nonconserved N-vector models with anisotropic nonequilibrium perturbations.

Dutta, Sreedhar B,Park, Su-Chan Published by the American Physical Society through 2011 Physical review. E, Statistical, nonlinear, and so Vol.83 No.1

<P>We study dynamic field theories for nonconserving N-vector models that are subject to spatial-anisotropic bias perturbations. We first investigate the conditions under which these field theories can have a single length scale. When N=2 or N수?, it turns out that there are no such field theories and, hence, the corresponding models are pushed by the bias into the Ising class. We further construct nontrivial field theories for the N=3 case with certain bias perturbations and analyze the renormalization-group flow equations. We find that the three-component systems can exhibit rich critical behavior belonging to two different universality classes.</P>