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Biswal Bijaylaxmi,Mishra Dilip Kumar,Mohapatra Jyoshnarani,Bhuyan Satyanarayan 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.5
The conventional high-temperature solid-state reaction technique is used to synthesize aluminosilicate ceramics of three different compositions (Al 0.70 Si 0.30 O, Al 0.73 Si 0.27 O, Al 0.75 Si 0.25 O). These aluminosilicate ceramics are systematically investigated by XRD, FTIR, SEM, dielectric, electrical, and UV–visible analysis. The polycrystalline ceramics are well synthesized at a sintering temperature of 1450 °C, confirmed from XRD studies. The IR interferogram reveals the presence of mullite (3Al 2 O 3 2SiO 2 )-type molecules in these aluminosilicate ceramics. The SEM images show the formation of homogeneous microstructures with appreciable density. The room temperature dielectric constant values for Al 0.70 Si 0.30 O, Al 0.73 Si 0.27 O, Al 0.75 Si 0.25 O ceramics are 1.5, 1.8, and 1.7 at 1 MHz frequency with dielectric loss values of 0.02, 0.04, and 0.06 respectively. The ac conductivity spectrum of these samples obeys the Arrhenius equation and the classical correlated barrier hopping model governs the conduction mechanism in these ceramics. Complex impedance analysis confirms the contribution of both grain and grain boundary towards transport processes in these ceramics. The UV–visible spectrum reveals that the synthesized ceramics, Al 0.70 Si 0.30 O, Al 0.73 Si 0.27 O, and Al 0.75 Si 0.25 O have a wide-band-gap of the order of 3.45 eV, 3.42 eV, and 3.39 eV respectively. These ceramics can be preferably used as electronic substrates, packaging material for high-frequency circuits, and infrared transmitting window materials.
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Management of maxillofacial injuries in bear mauling cases: a review of 20 cases
Indu Bhusan Kar,Prashant Dilip Chopda,Niranjan Mishra,Alok Kumar Sethi,Bikas Ranjan Mahavoi 대한구강악안면외과학회 2016 대한구강악안면외과학회지 Vol.42 No.1
Objectives: As the craniofacial and neck regions are prime areas of injury in bear attacks, the careful management of soft and hard tissue injuries and selection of reconstructive options is of the utmost importance. This study will review the incidence and patterns of bear mauling in eastern India reported to our department and the various modalities used for their treatment over a period of 7 years. It also documents the risks of infection in bear mauling cases and the complications that have occurred. Materials and Methods: Twenty cases were treated over the study period. Cases were evaluated for soft and hard tissue injuries including tissue loss and corresponding management in the craniofacial region. Cases were also evaluated for other associated injuries, organ damage and related complications. Results: Various modalities of treatment were used for the management of victims, ranging from simple primary repairs to free tissue transfers. Simple primary repairs were done in 75% of cases, while the management of the injured victims required reconstruction by local, regional or distant flaps in 25%. Free tissue transfers were performed in 15% of cases, and no cases of wound infection were detected in the course of treatment. Conclusion: Knowledge of various reconstructive techniques is essential for managing maxillofacial injuries in bear mauling cases. Modern reconstructive procedures like free tissue transfer are reliable options for reconstruction with minimal co-morbidity and dramatic improvement in treatment outcomes.
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Das, Arya,Sahoo, Rakesh K.,Kumar Mishra, Dilip,Singh, Saroj K.,Mane, Rajaram S.,Kim, Kwang Ho Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.467 No.-
<P><B>Abstract</B></P> <P>We report a simple, time-consuming and scalable synthesis of ZnO<SUB>1−x</SUB>Mn<SUB>x</SUB> nanocrystals (Mn-ZnO NCs) using a thermal plasma chemical method. The diffusion of the Mn<SUP>2+</SUP> into the host ZnO lattice causes pronounced change in the structure, morphology, spectroscopy and magnetic properties of ZnO. The Mn-doping in ZnO lattice introduces defects by changing the lattice constant values, vibration mode shift at a particular position, decrease in the band gap energy from 3.23 to 3.08 eV, with more than 90% photoluminescence quenching proficiency which has not only makes it as the efficient photocatalyst in methylene blue dye degradation but also confirms change in the shape and the magnitude of the electron spin resonance spectra, suggesting revelation of the dilute magnetic semiconducting properties in ZnO. The onset of the sharp resonance peak at 0.6% Mn-doping level followed a sharp fall in the intensity when Mn-concentration ≥0.8% has thoroughly been investigated and explored. Moreover, a tunable optical absorption change of Mn-ZnO NCs at various Mn-contents corroborats a proficient visible light photocatalytic performance which has been optimized, exquisitely, on controlling the shape and Mn-doping concentration level. Our results offer a basic understanding of synergetic effect taking place in enhancing the photocatalytic performance, which otherwise could cause by a defect-mediated ferromagnetic coupling and optimal Mn-doping concentration.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A time-consuming and scalable thermal plasma synthesis of ZnO<SUB>1−x</SUB>Mn<SUB>x</SUB> nanocrystals. </LI> <LI> Effect of Mn-doping on the bandgap of ZnO through structural and optical studies. </LI> <LI> Synergistic effect of ferromagnetic coupling and optimal Mn-dopants on photocatalysis. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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