8,976 research outputs found
Certificates of Conference/ Seminar /Webinar/Workshop/ Refresher / Orientation / Short Term Courses Attended
No full textAbhishek Kumar Certificates of Various Conference/ Seminar /Webinar/Workshop/ Refresher / Orientation / Short Term Courses from 12 Dec 2020 to 14 Oct 2023.</p
Electromechanically tunable frequency-agile metamaterial bandpass filters for terahertz waves
No full textTunable transmission filters are essential for various key terahertz applications including miniaturized spectrometers, hyperspectral imagers and channel selectors in high-speed wireless communication systems. However, tunable terahertz transmission filters have remained elusive, so far. Here, we report an electromechanically reconfigurable microcantilever integrated complementary metamaterial to function as a frequency-agile bandpass transmission filter at terahertz spectral region. A large tunable range of 70% at central frequency of 0.455 THz is designed and the experimental results show switching of terahertz transmission frequency range of 54% at central frequency of 0.5 THz. The proposed electromechanically reconfigurable metadevice provides large tunable range, uses electrical control, and is fabricated using CMOS compatible materials and process, thus making it highly attractive for the realization of plethora of miniaturized high-performance terahertz components and devices
INFLUENCE OF SUBSTRATE ON PHYSICAL PROPERTIES OF TRANSITION METAL COMPLEXES THIN FILMS
Get PDFIn order to exploit the potential of transition metal complexes in novel optoelectronic devices, it is crucial to gain a thorough understanding of their interfacial electronic properties with conducting substrates and establish interconnection between structural and physical properties of transition metal complexes thin films on technologically important substrates. The thesis aims to establish the interconnection between structural and physical properties of tetrapyrrole complexes by underscoring the significance of intermolecular interactions, structural deformations, and molecular order, providing useful insights for the creation and control of functional molecular films, crucial for the technological applications of organic semiconductors. A multi-technique characterization approach has been adopted approach based on electronic and absorption spectroscopies and structural diffraction techniques. Inverse photoemission spectroscopy has been utilized to highlight the influence of intermolecular interactions on unoccupied density of states as empty orbitals are more sensitive to the intermolecular interaction due to their higher delocalization around the macrocycle.
Photoemission and X-ray absorption spectroscopy have been utilized to demonstrate the ability of graphene to control the interaction of FeTPP-Cl adsorbed onto Gr/Ni(111) and Gr/Pt(111) substrates. It has been demonstrated that interfacial charge transfer can be significantly influenced by the introduction of graphene buffer layer between transition metal complexes adsorbed on metallic substrates. Inverse photoemission spectroscopy has been utilized for metal phthalocyanine and metal octaethylporphyrin thin films on metallic substrates to investigate the subtle changes induced by central metal atom, intermolecular interactions and peripheral ethyl groups on unoccupied density of states.
FePc and CoPc thin films deposited on technologically important substrates such as SiOx/Si , ITO and Au reveals that the vibrational properties have strong dependence on molecular stacking adopted by molecules which in turn depends on substrate roughness, intermolecular interactions and molecule-substrate interactions. We have employed vacuum deposited Zinc Octaethyl porphyrin (ZnOEP) thin films with a different degree of long-range order as model systems An asymmetrical stretching of skeletal carbon atoms of the porphyrin conformer has been observed and attributed to the ordered molecular stacking and intermolecular interactions. X-ray absorption near edge structure (XANES) establishes a symmetry reduction in the molecular conformer involving skeletal carbon atoms of the porphyrin ring for the ordered films highlighting the consequences of increased pi stacking of ZnOEP molecules adopting triclinic structure. The observed asymmetrical stretching of pi conjugation network of porphyrin structure can have significant implications on the charge transport and light harvesting ability of porphyrin thin films on substrates.In order to exploit the potential of transition metal complexes in novel optoelectronic devices, it is crucial to gain thorough understanding of their interfacial electronic properties with conducting substrates and establish interconnection between structural and physical properties of transition metal complexes thin films on technologically important substrates. The thesis aims to establish the interconnection between structural and physical properties of tetrapyrrole complexes by underscoring the significance of intermolecular interactions, structural deformations and molecular order, providing useful insights for the creation and control of functional molecular films, crucial for the technological applications of organic semiconductors. A multi-technique characterization approach has been adopted approach based on electronic and absorption spectroscopies and structural diffraction techniques. Inverse photoemission spectroscopy has been utilized to highlight the influence of intermolecular interactions on unoccupied density of states as empty orbitals are more sensitive to the intermolecular interaction due to their higher delocalization around the macrocycle.
Photoemission and X-ray absorption spectroscopy have been utilized to demonstrate the ability of graphene to control the interaction of FeTPP-Cl adsorbed onto Gr/Ni(111) and Gr/Pt(111) substrates. It has been demonstrated that interfacial charge transfer can be significantly influenced by the introduction of graphene buffer layer between transition metal complexes adsorbed on metallic substrates. Inverse photoemission spectroscopy has been utilized for metal phthalocyanine and metal octaethylporphyrin thin films on metallic substrates to investigate the subtle changes induced by central metal atom, intermolecular interactions and peripheral ethyl groups on unoccupied density of states.
FePc and CoPc thin films deposited on technologically important substrates such as SiOx/Si , ITO and Au reveals that the vibrational properties have strong dependence on molecular stacking adopted by molecules which in turn depends on substrate roughness, intermolecular interactions and molecule-substrate interactions. We have employed vacuum deposited Zinc Octaethyl porphyrin (ZnOEP) thin films with a different degree of long-range order as model systems An asymmetrical stretching of skeletal carbon atoms of the porphyrin conformer has been observed and attributed to the ordered molecular stacking and intermolecular interactions. X-ray absorption near edge structure (XANES) establishes a symmetry reduction in the molecular conformer involving skeletal carbon atoms of the porphyrin ring for the ordered films highlighting the consequences of increased pi stacking of ZnOEP molecules adopting triclinic structure. The observed asymmetrical stretching of pi conjugation network of porphyrin structure can have significant implications on the charge transport and light harvesting ability of porphyrin thin films on substrates
sj-docx-2-eae-10.1177_0958305X231167467 - Supplemental material for Comparative evaluation of combustion, performance, exergy and emission characteristics in hydrogen-biodiesel dual fuel engine under RCCI mode
No full textSupplemental material, sj-docx-2-eae-10.1177_0958305X231167467 for Comparative evaluation of combustion, performance, exergy and emission characteristics in
hydrogen-biodiesel dual fuel engine under RCCI mode by Mukund Kumar and Abhishek Paul in Energy & Environment</p
sj-docx-1-eae-10.1177_0958305X231167467 - Supplemental material for Comparative evaluation of combustion, performance, exergy and emission characteristics in hydrogen-biodiesel dual fuel engine under RCCI mode
No full textSupplemental material, sj-docx-1-eae-10.1177_0958305X231167467 for Comparative evaluation of combustion, performance, exergy and emission characteristics in
hydrogen-biodiesel dual fuel engine under RCCI mode by Mukund Kumar and Abhishek Paul in Energy & Environment</p
sj-docx-3-eae-10.1177_0958305X231167467 - Supplemental material for Comparative evaluation of combustion, performance, exergy and emission characteristics in hydrogen-biodiesel dual fuel engine under RCCI mode
No full textSupplemental material, sj-docx-3-eae-10.1177_0958305X231167467 for Comparative evaluation of combustion, performance, exergy and emission characteristics in
hydrogen-biodiesel dual fuel engine under RCCI mode by Mukund Kumar and Abhishek Paul in Energy & Environment</p
sj-docx-4-eae-10.1177_0958305X231167467 - Supplemental material for Comparative evaluation of combustion, performance, exergy and emission characteristics in hydrogen-biodiesel dual fuel engine under RCCI mode
No full textSupplemental material, sj-docx-4-eae-10.1177_0958305X231167467 for Comparative evaluation of combustion, performance, exergy and emission characteristics in
hydrogen-biodiesel dual fuel engine under RCCI mode by Mukund Kumar and Abhishek Paul in Energy & Environment</p
News, noise, and Indian business cycle
No full textNew Keynesian dynamic stochastic general equilibrium models with various specifications of technology, markup, and interest rate shocks are estimated with Indian data using Kalman filter based pure and Bayesian likelihood estimation. Preference and interest rate shocks are found to be important for output determination, whereas markup and interest rate shocks are important for inflation. News, as contained in stock market variables and arising from anticipated interest rates, affects growth of gross domestic product. Interest rate shock is anticipated at horizon of one quarter and out of total variance explained by interest rate shock, one third is due to the anticipated shock. Anticipated interest rate shock diminishes the share of preference shock in output determination. Although markup shock has a large share, its persistence is low. There is evidence that permanent component of technology is not well anticipated. Once we incorporate this, technology shocks affect output more, although they still remain much below US levels. Implications for policy include forward guidance on interest rates, less reaction to short-term supply shocks, and allowing technology shocks to play out
Impact evaluation of green–grey infrastructure interaction on built-space integrity: an emerging perspective to urban ecosystem service
Get PDFThis paper evaluates the role of urban green infrastructure (GI) in maintaining integrity of built-space. The latter is considered as a lateral ecosystem function, worth including in future assessments of integrated ecosystem services. The basic tenet is that integrated green–grey infrastructures (GGIs) would have three influences on built-spaces: (i) reduced wind withering from flow deviation; (ii) reduced material corrosion/degeneration from pollution removal; and (iii) act as a biophysical buffer in altering the micro-climate. A case study is presented, combining the features of computational fluid dynamics (CFD) in micro-environmental modelling with the emerging science on interactions of GGIs. The coupled seasonal dynamics of the above three effects are assessed for two building materials (limestone and steel) using the following three scenarios: (i) business as usual (BAU), (ii) summer (REGEN-S), and (iii) winter (REGEN-W).
Apparently, integrated ecosystem service from green–grey interaction, as scoped in this paper, has strong seasonal dependence. Compared to BAU our results suggest that REGEN-S leads to slight increment in limestone recession (< 10%), mainly from exacerbation in ozone damage, while large reduction in steel recession (up to 37%) is observed. The selection of vegetation species, especially their bVOC emission potential and seasonal foliage profile, appears to play a vital role in determining the impact GI has on the integrity of the neighbouring built-up environment
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