182 research outputs found
Electronic properties of lithium-ion battery cathodes studied in ion-gated transistor configuration
No full textSummary: Electronic and ionic transport governs lithium-ion battery (LIB) operation. The in operando study of electronic transport in lithium-ion transition metal oxide (LMOx) cathodes at different states of charge enables the evaluation of the state of health of LIBs and the optimization of their performance. We report on electronic transport in LIB cathode materials at different states of charge controlled in operando in ion-gated transistor (IGT) configuration. We considered LiNi0.5Mn0.3Co0.2O2 (NMC532)- and LiMn1.5Ni0.5O4 (LNMO)-based composite materials formulated like in conventional LIB cathodes and operated in the organic electrolyte LP30 (1M LiPF6 in ethylene carbonate:dimethyl carbonate 1:1 v/v). NMC532- and LNMO-based cathode materials were used as the transistor channel materials and LP30 as the ion gating medium. Beyond its impact on the field of LIBs, our work advances the design of novel devices based on mixed ionic and electronic transport, including neuromorphic computing
Photolithographically Patterned TiO2 Films for Electrolyte-Gated Transistors
No full textMetal oxides constitute a class of materials whose properties cover the entire range from insulators to semiconductors to metals. Most metal
oxides are abundant and accessible at moderate cost. Metal oxides are widely investigated as channel materials in transistors, including electrolyte-gated transistors, where the charge carrier density can be modulated by orders of magnitude upon application of relatively low electrical bias (2 V). Electrolyte gating offers the opportunity to envisage new applications in flexible and printed electronics as well as to improve our current understanding of fundamental processes in electronic materials, e.g. insulator/metal transitions. In this work, we employ photolithographically patterned TiO2 films as channels for electrolyte-gated transistors. TiO2 stands out for its biocompatibility and wide use in sensing, electrochromics, photovoltaics and photocatalysis. We fabricated TiO2 electrolyte-gated transistors using an original unconventional
parylene-based patterning technique. By using a combination of electrochemical and charge carrier transport measurements we demonstrated that patterning improves the performance of electrolytegated
TiO2 transistors with respect to their unpatterned counterparts. Patterned electrolyte-gated (EG) TiO2 transistors show threshold voltages of about 0.9 V, ON/OFF ratios as high as 1 × 105, and electron mobility above 1 cm2/(V s)
Impact of physical and chemical mutagenesis on growth and flowering parameters in tuberose variety Arka Prajwal
No full textThe present study evaluated the effects of physical (gamma radiation) and chemical (ethyl methane sulphonate, EMS) mutagens on the growth and flowering parameters of Arka Prajwal in the M1V1 generation. Uniform-sized bulbs were subjected to gamma radiation (1.5 kR, 2.0 kR and 2.5 kR) and EMS treatments (0.3%, 0.4% and 0.5%) to induce variability. Growth parameters, including sprouting time, plant height, number of leaves, leaf dimensions and plant spread, exhibited significant variation across treatments. Gamma radiation delayed bulb sprouting (21.27–25.83 days) compared to control (12.53 days), while EMS treatments showed intermediate sprouting times (14.75–20.13 days). Plant height and leaf dimensions were highest in 0.4% EMS-treated plants, with notable increases in leaf width and plant spread. Flowering parameters demonstrated that EMS treatments accelerated spike emergence and floret opening compared to gamma irradiation. EMS-treated plants (0.3%) showed the earliest flowering, with reduced days to spike emergence (73.47 days) and first floret opening (90.38 days). Spike length and rachis length were slightly reduced in gamma-treated plants, while EMS-treated plants maintained longer spikes and rachis. The number of florets per spike was highest under EMS treatment (44.93 florets for 0.3%), accompanied by improved floret dimensions and weight. The study highlights that EMS enhanced growth and flowering performance in Arka Prajwal, while higher doses of gamma radiation adversely affected these parameters. This research provides insights into the potential of mutagenesis for improving floricultural traits in tuberose
Optimal design of eVTOLs for urban mobility using analytical target cascading (ATC)
No full textSubmission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo termsThe student, Prajwal Chinthoju, accepted the attached license on 2022-12-08 at 19:12.The student, Prajwal Chinthoju, submitted this Thesis for approval on 2022-12-08 at 19:17.This Thesis was approved for publication on 2022-12-09 at 17:08.DSpace SAF Submission Ingestion Package generated from Vireo submission #18789 on 2023-04-12 at 07:39:45The aim of this thesis is to evaluate the capability of Analytical Target Cascading (ATC) for optimizing large scale engineering design optimization problems. Multidisciplinary Optimization (MDO) techniques have a subject of immense interest in the past few decades because of their ability to generate optimal designs for complex system of systems. Monolithic MDO methods are one category of MDO methods that pose the optimization problem as a single optimization problem. These methods are effective in generating an optimal design, but it can be challenging to implement these methods at an organizational level in engineering design practice. Meanwhile, distributed MDO methods that decompose the problem into different sub optimization problems offer additional modularity and flexibility required for implementation at an organizational level. Analytical target cascading (ATC) is one such distributed MDO method that most closely emulates a hierarchical organization structure. The problem of designing of an eVTOL (electric vertical takeoff and landing vehicle) was chosen to evaluate the performance of ATC because of its relevance to the future urban mobility solution space and because the design of eVTOLs involves optimization of several subsystems that are strongly coupled. The first part of this thesis focuses on the implementation and analysis of the results generated by ATC with respect to eVTOL design optimization. In the later part of this thesis, we set to lay out some of the general advantages of using distributed MDO methods over Monolithic MDO methods, as well as situations where the latter is more beneficial. In the final chapter, aspects involving computational expense and human factors effort are discussed to explore a set of cases where distributed MDO methods can be advantageous in engineering practice
Melanin-based flexible supercapacitors
No full textBiocompatible and biodegradable materials that store electrochemical energy are attractive candidates for applications in bioelectronics and electronics for everywhere. Eumelanin is a ubiquitous biopigment in flora and fauna. It exhibits strong broad-band UV-visible absorption, metal chelation as well as good thermal and photo-stability. Eumelanin is based on 5,6-dihydroxyindole (DHI) and 5,6-dihydroxyindole carboxylic acid (DHICA) building blocks, present in different redox forms (hydroxyquinone, semiquinone and quinone). The synergy between the redox activity of the building blocks and the capability of several of their functionalities to reversibly bind cations constitutes the foundation for the use of melanin in pseudocapacitive energy storage systems. In this work, we report on the energy storage properties of
eumelanin in supercapacitor configuration. Initially, a gravimetric specific capacitance as high as 167 F/g (specific capacity of 24 mA h/ g) was observed for eumelanin on carbon paper electrodes, in aqueous electrolytes. A maximum power density of up to 20 mW /cm2 was deduced for the corresponding melanin supercapacitors. Capitalizing on these results, we used an unconventional patterning approach to fabricate
binder-free flexible micro-supercapacitors on plastic substrates. Our results demonstrate that melanin is a valid candidate for future supercapacitor electrodes. The biocompatibility and biodegradability featured by eumelanin, combined with its easy availability and room temperature processing, make it an extremely attractive material for environmentally and human friendly energy storage solutions
Topics on electron,neutrino and axion scattering
No full textThesis: S.M., Massachusetts Institute of Technology, Department of Physics, 2015.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from PDF version of thesis.Includes bibliographical references (pages 61-64).Under the broad topic of scattering, in this thesis we particularly investigate Lorentz invariance using Compton Scattering at the Compton Polarimeter located in Hall-C at Thomas Jefferson National Accelerator Facility. The Mississippi State Axion Search, an axion search experiment which uses light shining through a wall technique is described in detail, including its instrumentation, initial tests and future impact. Furthermore, a novel method of detection of solar anti-neutrinos based on coherent neutrino scattering is described. Additionally, on the instrumentation side, development of a multi-purpose beam instrument based on synchrotron light to measure the electron beam polarization, beam profile and intensity at the future Electron Ion Collider is presented.by Prajwal Mohanmurthy.S.M
Influence of Different Pulsing Solutions on Postharvest Life of Tuberose (Polianthes tuberosa L.) cv. Prajwal
No full textTuberose flower (Polianthes tuberosa L.) is a perennial and bulbous flowering plant, related to the Amaryllidaceae family and now it is placed in family Agavaceae. The investigation entitled “Influence of different pulsing solutions on postharvest life of tuberose (Polianthes tuberosa L.) cv. Prajwal” was carried out at the experimental farm and laboratory of Department of Floriculture and Landscape Architecture, College of Horticulture, SVPUAT, Meerut during the year of 2021-22 & 2022-23. Experiment was laid out in Completely Randomized Design with 10 treatments and 3 replications. In the present experiment we aimed at prolonging the vase life and improving the quality of cut spike of tuberose by Pulsing or hydration procedure using different noble treatments in tuberose, as the main challenge was to reduce abscission of buds, initiation of bud opening mechanism and leaf yellowing due to the sensitivity, vascular infections, high rate of respiration and inhibition of ethylene production. These differences in physiological behavior of cut stem dipped in different pulsing solution are very important to consider when developing post harvest physiology of tuberose. In the present finding we have primarily focused and observed under the light of pertinent literature available substantiated with robust evidence thus we derived the overall best treatment for different parameters for improving the vase life of tuberose that were recorded under the treatment T9 (Sucrose 15% + 8-HQC 300 ppm) followed by the treatment T6 (Sucrose 10% + 8-HQC 300 ppm) and T8 (Sucrose 15% + 8-HQC 200 ppm) resulted in most of the postharvest parameters such as amount of pulsing solution consumed (13.16, 15.82 ml), days taken to opening of floret (2.53, 2.54 days), floret diameter (3.38, 3.40 cm), vase life (10.78, 10.80 days), weight change/loss in cut spike (13.29 %, 14.52 %), fungal infection, fragrance score (2.95, 2.96), freshness index (4.97, 4.98) and moisture content (89.89, 85.60, 83.21%)
MDO framework for university research collaboration: AGILE academy initiatives & outcomes
No full textAGILE Project is developing the 3rd generation MDO processes, which will support the development of the next generation aerospace products. The establishment of effective collaborative design methodologies is currently acknowledged as the key enabler for future product development processes. At the same time, the need to introduce collaborative design techniques within educational activities is also well recognized by the Academic, Research and Industrial communities. AGILE project supported by European Commission’s H2020 Programme, is setting the “AGILE Paradigm”, a conceptual framework which contains all the elements to implement a multidisciplinary collaborative design network. The AGILE Academy initiative is conceived to infuse into the Academic organizations and educational environments the “AGILE Paradigm”, and make available all the technologies developed within the AGILE Project, which support the implementation of such a Paradigm. This paper focus is on the inception, approach and results of the AGILE Academy participants from several universities around the world
Influence of Vermicompost and Bio-fertilizers on Growth and Flowering of Tuberose (Polianthes tuberosa L.) cv. Prajwal
No full textThe experiment was planned to sustainably improve the growth and yield of tuberose using bio-fertilizers and organic manures. performed in pots in completely randomized design (CRD) with 11 treatments having four replications to study the response of organic manures, chemical fertilizers and bio fertilizers on growth and flower yield of tuberose (Polianthes tuberosa L.) cv. Prajwal. The treatment containing sand + vermicompost (4:1) + Bio-fertilizers (Azotobacter&Pseudomonas sp.) was significantly superior in terms of plant height (70.50 cm), length of leaf (36.98 cm), Number of leaf (25.67), spike length (66.58 cm), rachis length (27.23 cm), diameter of stem (1.096 cm), florets number per spike (35), number of opened florets per spike (33.67), spikes number per clump, spike weight (75.33 g), bulb number per clump (21), bulb diameter (1.20 cm), bulb weight (3.98 g). While lowest values of these parameters were observed in the control (sand). Minimum days taken to bulb sprouting (21.75 days), days taken to complete bulb sprouting (24.50 days), days taken to spike emergence (93 days) and days taken to opening of first floret (106.75 days) were observed in sand + inorganic manures. Treatment having Sand + vermicompost (4:1) + Bio-fertilizers (Azotobacter&Pseudomonas sp. was observed best to promote growth and flowering of tuberose
Response of Foliar Application of GA3 and Paclobutrazol on Flowering and Vase Life of Tuberose (Polianthes tuberosa L.)
No full textThe present investigation “Response of foliar application of GA3 and paclobutrazol on flowering and vase life of Tuberose (Polianthes tuberosa L.)” was carried out was carried out in Horticulture Research Farm at the Department of Floriculture and Landscape Architecture, IGKV, Raipur, Chhattisgarh, India, 2017-18 and 2018-19. The experiment was laid out in Factorial Randomized Block Design with three replication comprising treatment combination of two PGRs (GA3 and Paclobutrazol) and two tuberose cultivars (Prajwal and Bidhan Ujjwal). Two PGR’s namely Gibberellins (GA3) and Paclobutrazol (PBZ) were taken as growth promoter and growth retardant, respectively. In this contest, an experiment was conducted to investigate the effect of different levels of growth promoter and retardant on growth, flowering and vase life of different cultivars of Tuberose. The result indicated that the vegetative growth, flowering and vase life were significantly influenced by different plant growth regulators and cultivars. The maximum plant height was recorded with cv. Prajwal (V1) as compared to cv. Bidhan Ujjwal (V2). While, minimum number days to first spike emergence (117.33 days), days to first flower opening (131.83 days) was recorded with cv. Bidhan Ujjwal. Among the growth regulators treatments GA3 150 ppm (30 and 50 DAP). However, maximum length of spike (94.72 cm), length of rachis (30.35 cm), length of florets (5.8 cm), diameter of florets (4.32 cm), Number of florets spike-1 (43.41) and Vase life (10.17 days) was recorded with cv. Prajwal. Among the growth regulators treatments GA3 150 ppm (30 and 50 DAP)
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