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- 저자 : S.K. Dhawan (검색결과 3 건)
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Pradeep Sambyal,S.K. Dhawan,Preeti Gairola,Sampat Singh Chauhan,S.P. Gairola 한국물리학회 2018 Current Applied Physics Vol.18 No.5
Present study focus on the designing of high performance microwave absorbing material against electromagnetic pollution. Herein we synthesize conducting polymer based composite encapsulated with Barium strontium titanate (BST), reduced graphene oxide (RGO), and Fe3O4 nanoparticles via chemical oxidative polymerization of pyrrole. The synthesized composite materials were thoroughly characterized using SEM, FTIR, XRD, TGA, and VSM techniques. The presence of filler materials in conducting polymer matrix leads to absorption dominated shielding effectiveness value of 48 dB in the frequency range of 8.2–12.4 GHz (X-band). Moreover, presence of dielectric and magnetic fillers increases the thermal and chemical stability of the composite material. The obtained shielding effectiveness value is above the recommended limit (30–40 dB) required for the commercial applications, therefore these composite material could be used as effective shield against EM pollution.
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Size dependent structural and magnetic behaviour of CaFe2O4
Arvind Samariya,S.N. Dolia,Arun S. Prasad,P.K. Sharma,S.P. Pareek,M.S. Dhawan,Sudhish Kumar 한국물리학회 2013 Current Applied Physics Vol.13 No.5
CaFe2O4 nanocrystalline powders were synthesized through solegel treatment in which the stoichiometric mixing of various nitrates involving calcium and iron in presence of citric acid was performed. Subsequently, the as prepared sample was annealed at various temperatures in order to obtain the fine distribution of size including the bulk counterpart. The samples were then characterized using powder X-ray diffraction followed by 57Fe Mössbauer spectroscopy, SQUID as well as vibrating sample magnetometry. The results of spectroanalyses revealed that the samples were formed in single phase cubic spinel structure and exhibits room temperature superparamagnetism, except the bulk one, which crystallizes in characteristic orthorhombic structure of CaFe2O4 and displays trivial coercivity and remanent magnetization at room temperature.
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Growth and Impact of Research Output of University of Mysore, 1996-2006: A Case Study
Kumbar, Mallinath,Gupta, B.M.,Dhawan, S.K. Korea Institute of Science and Technology Informat 2008 Journal of Information Science Theory and Practice Vol.39 No.4
이 연구는 University of Mysore의 과학기술 분야 연구자들이 수행한 연구성과의 성장과 기여, 영향에 대해 분석하였다. 또한 이 대학 소속 과학자들의 커뮤니케이션 패턴을 분석하고 서로 다른 저널에 발표된 연구성과의 집중 및 분산 정도를 조사한다. 평균인용도의 측면에서 이 대학이 강점과 약점을 가지고 있는 연구영역, 성장률과 영향, 학과별 연구동향에 대해 분석하였으며, 전반적인 수준과 주제분야별, 국가별로 연구성과의 국제적 협력에 대해 조사한다. 인용빈도가 높은 논문과 생산성이 높은 저자의 특성에 대해서도 분석하였다. This study describes the growth, contribution and impact of research carried out by University of Mysore scientists in science and technology. It indicates the patterns of communications of university scientists and studies the extent of concentration and scattering of their research output in different journals. It also analyses the strong and weak areas of university research, their growth rate and impact in terms of average citations received. It also studies the output and impact of research under different existing subject departments of the university and analyses the international collaborative share of research output at the overall level as well as across various subjects, indicating also the major countries involved in international collaboration. It describes the share and characteristics of select high cited papers and the top productive authors.
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