المؤلفون: Pankaj Kumar Tripathi, Tarsh Manohar, Ayushi Rastogi, Rajiv Manohar

مصطلحات موضوعية: Materials science, Porous carbon, Polymers and Plastics, Chemical engineering, Quantum dot, Liquid crystal, Palm oil, Dielectric, Physical and Theoretical Chemistry, Surfaces, Coatings and Films

الوصف: The effect of dispersing oil palm leaf-based porous carbon quantum dots (OPL QDs) in nematic liquid crystal p-methoxybenzylidene p-decylaniline (MBDA) has been studied in this paper. The dielectric properties were measured with and without bias voltage as a function of frequency and temperature. Electro-optical parameters like response time, rotational viscosity and birefringence have also been studied with respect to temperature and OPL QDs concentration. The main findings show that when the dispersion of OPL QDs increases, the sign of dielectric anisotropy changes. Fall time has been found to be faster than the rise time for pure MBDA, composites 1 and 2, while composites 3 to 5 have faster rise time than fall time. This has been due to a change in the sign of dielectric anisotropy that begins from composite 3. UV-VIS absorbance and photoluminescence studies have been carried out which demonstrates the existence of π–π* transition. The remarkable outcomes of this work can be applied in the display and photonics field. Dielectric and electro-optical characterization has been reported for MBDA-OPL composite systems. Reversal in the sign of dielectric anisotropy starts from composite 3. Faster response with reduced rotational viscosity has been revealed.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::94cdf393072fbc4ea4e96f2ae0b81a51Test

المؤلفون: Pankaj Kumar Choudhury, E.M. Sheta

المصدر: IEEE Photonics Technology Letters. 33:1351-1354

مصطلحات موضوعية: Materials science, business.industry, Physics::Optics, chemistry.chemical_element, Metamaterial, Optical polarization, Nitride, Polarization (waves), Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Hafnium, Solar cell efficiency, chemistry, Optoelectronics, Electrical and Electronic Engineering, business, Absorption (electromagnetic radiation), Plasmon

الوصف: Hyperbolic metamaterial (HMM) based absorber comprising metasurface having periodically arranged hafnium nitride nanodisks was investigated. The constitutive and absorption properties of the structure were evaluated considering different parametric and operational conditions. Both the TE- and TM-incidence waves were studied along with different incidence and polarization angles. Using the finite integration technique, the absorber was found to exhibit high (polarization insensitive) ultrawideband absorption. With such features, the proposed HMM has prospects in developing plasmonic devices to enhance solar cell efficiency and other optical applications.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::d7c51fe2bd622f014c9cf6017738ed12Test
https://doi.org/10.1109/lpt.2021.3119331Test

المؤلفون: Shaleen, Pankaj Kumar, Surya Prakash Singh

المصدر: Journal of Computational Electronics. 21:86-93

مصطلحات موضوعية: chemistry.chemical_classification, Materials science, business.industry, Biomolecule, Schottky diode, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Metal, Semiconductor, chemistry, Modeling and Simulation, visual_art, visual_art.visual_art_medium, Optoelectronics, Electrical and Electronic Engineering, Silicon nanowires, business, Label free

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::02535aae785bc3740fb03fe66e559a4fTest
https://doi.org/10.1007/s10825-021-01824-2Test

المؤلفون: Yukihiro Kawamura, Boby Joseph, Govindaraj Lingannan, Chihiro Sekine, Arumugam Sonachalam, Kento Ishigaki, Yoshiya Uwatoko, Pankaj Kumar Maheswari, Ponniah Vajeeston, Kannan Murugesan, Hayashi Junichi, V. P. S. Awana

المصدر: ACS Omega, Vol 6, Iss 45, Pp 30419-30431 (2021)

مصطلحات موضوعية: Superconductivity, Materials science, Flux pinning, Condensed matter physics, General Chemical Engineering, Fermi level, Hexagonal phase, General Chemistry, Chemistry, Tetragonal crystal system, symbols.namesake, Density of states, symbols, QD1-999, Critical field, Pinning force

الوصف: We have investigated the pressure (P) effect on structural (up to 10 GPa), transport [R(T): up to 10 GPa], and magnetic [(M(T): up to 1 GPa)] properties and analyzed the flux pinning mechanism of the Fe0.99Mn0.01Se0.5Te0.5 superconductor. The maximum superconducting transition temperature (T c) of 22 K with the P coefficient of T c dT c/dP = +2.6 K/GPa up to 3 GPa (dT c/dP = -3.6 K/GPa, 3 ≤ P ≥ 9 GPa) was evidenced from R(T) measurements. The high-pressure diffraction and density functional theory (DFT) calculations reveal structural phase transformation from tetragonal to hexagonal at 5.9 GPa, and a remarkable change in the unit cell volume is observed at ∼3 GPa where the T c starts to decrease, which may be due to the reduction of charge carriers, as evidenced by a reduction in the density of states (DOS) close to the Fermi level. At higher pressures of 7.7 GPa ≤ P ≥ 10.2 GPa, a mixed phase (tetragonal + hexagonal phase) is observed, and the T c completely vanishes at 9 GPa. A significant enhancement in the critical current density (J C) is observed due to the increase of pinning centers induced by external pressure. The field dependence of the critical current density under pressure shows a crossover from the δl pinning mechanism (at 0 GPa) to the δT c pinning mechanism (at 1.2 GPa). The field dependence of the pinning force at ambient condition and under pressure reveals the dense point pinning mechanism of Fe0.99Mn0.01Se0.5Te0.5. Moreover, both upper critical field (H C2) and J C are enhanced significantly by the application of an external P and change over to a high P phase (hexagonal ∼5.9 GPa) faster than a Fe0.99Ni0.01Se0.5Te0.5 (7.7 GPa) superconductor.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b8e030f41c55db54ef67ff23fd8ff1b2Test
https://doi.org/10.1021/acsomega.1c03721Test

المؤلفون: Pankaj Kumar Gupta

المصدر: International Journal for Research in Applied Science and Engineering Technology. 9:13-20

مصطلحات موضوعية: Piston, Materials science, law, Mechanics, Thermal analysis, Finite element method, law.invention

الوصف: In this project, it was chosen to investigate a specific piston design and its maximum gas pressure capabilities. The first aim for this project is to create a piston model using the solid modelling software CATIA V5. The geometry will be meshed and analyzed using the ANSYS software. A thorough literature search was conducted for the examination of piston input circumstances and the analytical process. High combustion gas pressures operate as mechanical loads, causing substantial strains in the piston's critical area. For various loading situations, such as maximum gas pressure load, a detailed static structural analysis is carried out. To choose the best material, a comparative research is carried out. Relative examination is never really dominated material. A cylinder is a mechanical part found in an assortment of cycles like pneumatic chambers. Responding siphons, responding motors and gas blowers. It is the upward development inside a chamber that is put away gastight by cylinder .In the auto business, it is found that the cylinder is the most fundamental part of the motor, and that it is presented to serious mechanical and warm loads. Warm burdens are initiated in the cylinder because of the exceptionally high temperature differential between the cylinder crown and the cooling displays. The cylinders are regularly built of aluminum due to its lightweight and heat conductivity. Be that as it may, as a result of its low hot strength and high development coefficient, it isn't suggested for use in high-temperature applications. The reason for a section bar or potentially an associating bar in a motor is to move power from growing gas to the barrel shaped shaft through an interfacing bar and additionally segment pole. To pack or remove the liquid put away in the chamber, the siphons turned around the capacity of the cylinder and communicate power from driving rod to it. In the initial step the primary examination of a common cylinder developed of the aluminum composite is concentrated in this exploration. The subsequent advance is to direct an investigation on a cylinder developed of Aluminum and Cast iron. Lightweight, minimal expense, primarily and thermally safe materials ought to be used in the development of pistons in the third step Validation of investigation result with contrasting the traditional material.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::b4e4eed67b183aa2b20277783c4716c1Test
https://doi.org/10.22214/ijraset.2021.38310Test

المؤلفون: Debadutta Das, Pankaj Kumar Parhi, Devi Prasad Mishra, Shaswat Kumar Das, Umakanta Behera

المصدر: International Journal of Coal Preparation and Utilization. 42:3724-3744

مصطلحات موضوعية: Materials science, Waste management, biology, Mechanical Engineering, General Chemical Engineering, Energy Engineering and Power Technology, Geotechnical Engineering and Engineering Geology, Sapindus, biology.organism_classification, Fuel Technology, Pulmonary surfactant, Rheology, Fly ash, Slurry, Leaching (metallurgy)

الوصف: The present investigation is intended to develop the stabilization and transportation behavior of fly ash slurry (FAS) using the mixture of the surfactants, namely, Sapindus laurifolia (S. laurifol...

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::0af1bb975ab2e1b3c2e50b4d7720909fTest
https://doi.org/10.1080/19392699.2021.1995374Test

المؤلفون: Amlan Gupta, Parita Basnet, Pankaj Kumar Jha, Somenath Chatterjee

المصدر: Journal of Nano Research. 70:53-66

مصطلحات موضوعية: Materials science, Zno nanoparticles, Chemical engineering, Staphylococcus aureus, Nano, medicine, Bacterial growth, medicine.disease_cause, Escherichia coli

الوصف: The spontaneous progress in scientific bases to combat infections resulting from pathogenic microbial colonies has led to the development of nanomaterials capped with plant phytochemicals that possess exceptional bacterial growth resistance. In this study, the Authors report an economical biogenic synthesis of zinc oxide nanoparticles and its nanocomposites with silver, gold, and silver-gold bimetal to evaluate their antibacterial potency towards bacterial colonies. Further, these nanomaterials were functionalized with tea-phytochemicals for cost-effective synthesis, as a biogenic capping and reducing agent, for modulating the growth kinetics of nanomaterials, and because of their synergy with the nanomaterials in improving their antibacterial property. The identification of the biosynthesized nanomaterials was performed through various microscopic and spectroscopic techniques. The model microbes chosen to undergo this study were Escherichia coli, a gram-negative bacterium, and Staphylococcus aureus, a gram-positive bacterium. Based on the anti-bacterial essay, certain factors, such as the nature of the bacteria and nanomaterials, the production rates of superoxide radicals, etc. determined the extent of microbial growth inhibition.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::4c27b55ea552e69f14d681eb0ab03ea4Test
https://doi.org/10.4028/www.scientific.net/jnanor.70.53Test

المؤلفون: Ranjan Bhattacharyya, Anirvan DasGupta, Pankaj Kumar

المصدر: Waves in Random and Complex Media. :1-20

مصطلحات موضوعية: Materials science, General Engineering, General Physics and Astronomy, Composite material, Layer (electronics), Viscoelasticity

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::2310fca26d56cf75c529a63dc930beecTest
https://doi.org/10.1080/17455030.2021.1989080Test

المؤلفون: Hiroki Miyaoka, Sanjay Kumar, Pankaj Kumar Singh, Vivekanand Kain, Anamika Singh, Yoshitsugu Kojima

المصدر: International Journal of Hydrogen Energy. 46:34362-34368

مصطلحات موضوعية: Materials science, Renewable Energy, Sustainability and the Environment, Magnesium, Alloy, Intermetallic, Energy Engineering and Power Technology, chemistry.chemical_element, Activation energy, engineering.material, Condensed Matter Physics, Catalysis, Metal, Chemical kinetics, Hydrogen storage, Fuel Technology, chemistry, Chemical engineering, visual_art, visual_art.visual_art_medium, engineering

الوصف: Both CaH2 and MgH2 are good candidate for the development of hydrogen storage materials because of their high hydrogen storage capacity. However, both the hydrides are quite stable thermodynamically and required high temperature for hydrogen sorption process. The MgH2–CaH2 composite could show the favourable hydrogen sorption reaction because of Ca–Mg intermetallic formation. The idea motivated to perform the experiments starting with these metal hydrides. It has been found that the hydrogen sorption reaction kinetics improved substantially. The dihydrogen product has shown a few intermetallic of magnesium and calcium. The hydrogen sorption temperature and pressure of the alloy was remarkably improved by the doping with ZrCl4 as a catalyst. The activation energy and the thermodynamic parameters of un-catalyzed and catalyzed alloy were studied. Present studied indicated that the CaH2–MgH2–ZrCl4 could be a potential candidate for the mobile hydrogen storage system.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::a179023d4c517878fcecb4ad07f9195cTest
https://doi.org/10.1016/j.ijhydene.2021.07.215Test

المؤلفون: Ravindra Vasave, Rajesh Kumar, Indrani Maji, Pravin Medtiya, Jitender Madan, Dharmendra Kumar Khatri, Shashi Bala Singh, Anitha Sriram, Srushti Mahajan, Pankaj Kumar Singh

المصدر: Journal of Controlled Release. 337:646-660

مصطلحات موضوعية: Drug, Materials science, media_common.quotation_subject, Administration, Oral, Biological Availability, Pharmaceutical Science, Self emulsifying, Nanotechnology, Approved drug, Dosage form, Bioavailability, Excipients, Drug Delivery Systems, Solubility, Emulsifying Agents, Drug delivery, Aqueous solubility, Humans, Emulsions, Patient compliance, media_common

الوصف: A significant proportion of recently approved drug molecules possess poor aqueous solubility which further restrains their desired bioavailability. Poor aqueous solubility of these drugs poses significant hurdles in development of novel drug delivery systems and achieving target response. Self-emulsifying drug delivery systems (SEDDS) emerged as an insightful approach for delivering highly hydrophobic entities to enhance their bioavailability. Conventional SEDDS were developed in a liquid form which owned numerous shortcomings like low stability and drug loading efficiency, fewer choices of dosage forms and irreversible precipitation of drug or excipients. To address these curbs solid-SEDDS (S-SEDDS) was introduced as an efficient strategy that combined advantages of solid dosage forms such as increased stability, portability and patient compliance along with substantial improvement in the bioavailability. S-SEDDS are isotropic mixtures of oil, surfactant, solvent and co-solvents generated by solidification of liquid or semisolid self-emulsifying ingredients onto powders. The present review highlights components of S-SEDDS, their peculiarities to be considered while designing solid dosage forms and various methods of fabrication. Lastly, key challenges faced during development, applications and future directions for the research in this area are thoroughly summarized.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8542a4ec29409427ba1bfcfa3e7940f0Test
https://doi.org/10.1016/j.jconrel.2021.08.013Test