Centurion University of Technology and Management

About: Centurion University of Technology and Management is a education organization based out in Bhubaneswar, India. It is known for research contribution in the topics: Dielectric & Ceramic. The organization has 619 authors who have published 668 publications receiving 2322 citations. The organization is also known as: Jagannath Institute for Technology and Management.

Frequency and temperature dependence behaviour of impedance, modulus and conductivity of BaBi4Ti4O15 aurivillius ceramic

Abstract: In this work, we report the dielectric, impedance, modulus and conductivity study of BaBi 4 Ti 4 O 15 ceramic synthesized by solid state reaction. X-ray diffraction (XRD) pattern showed orthorhombic structure with space group A21am confirming it to be an m = 4 member of the Aurivillius oxide. The frequency dependence dielectric study shows that the value of dielectric constant is high at lower frequencies and decreases with increase in frequency. Impedance spectroscopy analyses reveal a non-Debye relaxation phenomenon since relaxation frequency moves towards the positive side with increase in temperature. The shift in impedance peaks towards higher frequencyside indicates conductionin material andfavouringof the longrangemotion of mobile charge carriers. The Nyquist plot from complex impedance spectrumshows only one semicircular arc representingthe grain effect in the electrical conduction. The modulus mechanism indicates the non-Debye type of conductivity relaxation in the material, which is supported by impedance data. Relaxation times extracted using imaginary part of complex impedance (Z ′′ ) and modulus (M ′′ ) were also found to follow Arrhenius law. The frequency dependent AC conductivity at different temperatures indicates that the conduction process is thermally activated. The variation of DC conductivity exhibits a negative temperature coefficient of resistance behaviour.

The recent challenges of highly contagious COVID-19, causing respiratory infections: Symptoms, diagnosis, transmission, possible vaccines, animal models, and immunotherapy.

Abstract: COVID-19 is highly contagious pathogenic viral infection initiated from Wuhan seafood wholesale market of China on December 2019 and spread rapidly around the whole world due to onward transmission. This recent outbreak of novel coronavirus (CoV) was believed to be originated from bats and causing respiratory infections such as common cold, dry cough, fever, headache, dyspnea, pneumonia, and finally Severe Acute Respiratory Syndrome (SARS) in humans. For this widespread zoonotic virus, human-to-human transmission has resulted in nearly 83 lakh cases in 213 countries and territories with 4,50,686 deaths as on 19 June 2020. This review presents a report on the origin, transmission, symptoms, diagnosis, possible vaccines, animal models, and immunotherapy for this novel virus and will provide ample references for the researchers toward the ongoing development of therapeutic agents and vaccines and also preventing the spread of this disease.

Selenium Biofortification: Roles, Mechanisms, Responses and Prospects

Abstract: The trace element selenium (Se) is a crucial element for many living organisms, including soil microorganisms, plants and animals, including humans Generally, in Nature Se is taken up in the living cells of microorganisms, plants, animals and humans in several inorganic forms such as selenate, selenite, elemental Se and selenide These forms are converted to organic forms by biological process, mostly as the two selenoamino acids selenocysteine (SeCys) and selenomethionine (SeMet) The biological systems of plants, animals and humans can fix these amino acids into Se-containing proteins by a modest replacement of methionine with SeMet While the form SeCys is usually present in the active site of enzymes, which is essential for catalytic activity Within human cells, organic forms of Se are significant for the accurate functioning of the immune and reproductive systems, the thyroid and the brain, and to enzyme activity within cells Humans ingest Se through plant and animal foods rich in the element The concentration of Se in foodstuffs depends on the presence of available forms of Se in soils and its uptake and accumulation by plants and herbivorous animals Therefore, improving the availability of Se to plants is, therefore, a potential pathway to overcoming human Se deficiencies Among these prospective pathways, the Se-biofortification of plants has already been established as a pioneering approach for producing Se-enriched agricultural products To achieve this desirable aim of Se-biofortification, molecular breeding and genetic engineering in combination with novel agronomic and edaphic management approaches should be combined This current review summarizes the roles, responses, prospects and mechanisms of Se in human nutrition It also elaborates how biofortification is a plausible approach to resolving Se-deficiency in humans and other animals

Preparation and Characterization of Acid and Alkaline Treated Kaolin Clay

Abstract: Kaolin was refluxed with HNO 3 , HCl, H 3 PO 4 , CH 3 COOH, and NaOH of 3M concentration at 110 °C for 4 hours followed by calcination at 550 °C for 2 hours The physico-chemical characteristics of resulted leached kaolinite clay were studied by XRF, XRD, FTIR, TGA, DTA, SEM and N 2 adsorption techniques XRF and FTIR study indicate that acid treatment under reflux conditions lead to the removal of the octahedral Al 3+ cations along with other impurities XRD of acid treated clay shows that, the peak intensity was found to decrease Extent of leaching of Al 3+ ions is different for different acid/base treatment The acid treatment increased the Si/Al ratio, surface area and pore volume of the clay Thus, the treated kaolin clay can be used as promising adsorbent and catalyst supports © 2013 BCREC UNDIP All rights reserved Received: 1st March 2013; Revised: 9th April 2013; Accepted: 19th April 2013 [ How to Cite : Kumar, S, Panda, A K, Singh, RK (2013) Preparation and Characterization of Acids and Alkali Treated Kaolin Clay Bulletin of Chemical Reaction Engineering & Catalysis , 8 (1): 61-69 (doi:109767/bcrec81453061-69)] [ Permalink/DOI : http://dxdoiorg/109767/bcrec81453061-69 ] | View in |

Dynamic stability of a rotating sandwich beam with magnetorheological elastomer core

Abstract: In this work the dynamic stability of a rotating three layered symmetric sandwich beam with magnetorheological elastomer (MRE) core and conductive skins subjected to axial periodic loads has been investigated using finite element method (FEM). The derived governing equation of motion is in the form of a multi-degree of freedom Mathieu–Hill's equation with complex coefficients. The instability regions of the sandwich beam for the principal parametric resonance case have been determined by using the harmonic balance method. Effects of applied magnetic field, rotating speed, setting angle, hub radius, static load and dynamic load on the dynamic characteristics and instability regions of the sandwich beam are investigated. This work will find application in the passive and active vibration reduction of rotating sandwich structure using magnetorheological elastomer core, magnetic field and periodic axial load.