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Enhanced magnetic properties in hydrothermally synthesized Mn-doped BiFeO_3 nanoparticles
S. Basu,S.K.M. Hossain,D. Chakravorty,M. Pal 한국물리학회 2011 Current Applied Physics Vol.11 No.4
Mn-doped BiFeO_3 (BiFe_(1-x)Mn_xO_3 x = 0, 0.05, 0.1) nanoparticles were synthesized by hydrothermal method. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies indicate that the particle size decreases when doped with Mn. The ferroelectric Curie temperature estimated from differential thermal analysis (DTA) study shows a decreasing tendency with the increase of Mn concentration. Magnetic study shows that below 200 K all samples exhibit ferromagnetic behavior and magnetization value at 10 K increases from 0.0027 to 2.75 emu/gm when doped with 5% Mn. Enhancement of magnetization observed in these nanocrystals were discussed on the basis of the combined effect of local ferrimagnetization by B-site doping and the breakdown of spin cycloid due to smaller particle size.
Wavelet analysis and enhanced damage indicators
K. Muthumani,N. Gopalakrishnan,D. Basu,B.K. Raghuprasad,N. Lakshmanan 국제구조공학회 2007 Smart Structures and Systems, An International Jou Vol.3 No.1
Wavelet transforms are the emerging signal-processing tools for damage identification and time-frequency localization. A small perturbation in a static or dynamic displacement profile could be captured using multi-resolution technique of wavelet analysis. The paper presents the wavelet analysis of damaged linear structural elements using DB4 or BIOR6.8 family of wavelets. Starting with a localized reduction of EI at the mid-span of a simply supported beam, damage modeling is done for a typical steel and reinforced concrete beam element. Rotation and curvature mode shapes are found to be the improved indicators of damage and when these are coupled with wavelet analysis, a clear picture of damage singularity emerges. In the steel beam, the damage is modeled as a rotational spring and for an RC section, moment curvature relationship is used to compute the effective EI. Wavelet analysis is performed for these damage models for displacement, rotation and curvature mode shapes as well as static deformation profiles. It is shown that all the damage indicators like displacement, slope and curvature are magnified under higher modes. A localization scheme with arbitrary location of curvature nodes within a pseudo span is developed for steady state dynamic loads, such that curvature response and damages are maximized and the scheme is numerically tested and proved.
N. Lakshmanan,B. K. Raghuprasad,K. Muthumani,N. Gopalakrishnan,D. Basu 사단법인 한국계산역학회 2008 Computers and Concrete, An International Journal Vol.5 No.1
Structural health monitoring of existing infrastructure is currently an important field of research, where elaborate experimental programs and advanced analytical methods are used in identifying the current state of health of critical and important structures. The paper outlines two methods of system identification of beam-like reinforced concrete structures representing bridges, through static measurements, in a distributed damage scenario. The first one is similar to the stiffness method, re-cast and the second one to flexibility method. A least square error (LSE) based solution method is used for the estimation of flexural rigidities and damages of simply supported, cantilever and propped cantilever beam from the measured deformation values. The performance of both methods in the presence of measurement errors is demonstrated. An experiment on an un-symmetrically damaged simply supported reinforced concrete beam is used to validate the developed method. A method for damage prognosis is demonstrated using a generalized, indeterminate, propped cantilever beam.
Wavelet analysis and enhanced damage indicators
Lakshmanan, N.,Raghuprasad, B.K.,Muthumani, K.,Gopalakrishnan, N.,Basu, D. Techno-Press 2007 Smart Structures and Systems, An International Jou Vol.3 No.1
Wavelet transforms are the emerging signal-processing tools for damage identification and time-frequency localization. A small perturbation in a static or dynamic displacement profile could be captured using multi-resolution technique of wavelet analysis. The paper presents the wavelet analysis of damaged linear structural elements using DB4 or BIOR6.8 family of wavelets. Starting with a localized reduction of EI at the mid-span of a simply supported beam, damage modeling is done for a typical steel and reinforced concrete beam element. Rotation and curvature mode shapes are found to be the improved indicators of damage and when these are coupled with wavelet analysis, a clear picture of damage singularity emerges. In the steel beam, the damage is modeled as a rotational spring and for an RC section, moment curvature relationship is used to compute the effective EI. Wavelet analysis is performed for these damage models for displacement, rotation and curvature mode shapes as well as static deformation profiles. It is shown that all the damage indicators like displacement, slope and curvature are magnified under higher modes. A localization scheme with arbitrary location of curvature nodes within a pseudo span is developed for steady state dynamic loads, such that curvature response and damages are maximized and the scheme is numerically tested and proved.
Using Implementation Science to Advance Cancer Prevention in India
Krishnan, Suneeta,Sivaram, Sudha,Anderson, Benjamin O.,Basu, Partha,Belinson, Jerome L,Bhatla, Neerja,D' Cruz, Anil,Dhillon, Preet K.,Gupta, Prakash C.,Joshi, Niranjan,Jhulka, PK,Kailash, Uma,Kapambwe Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.9
Oral, cervical and breast cancers, which are either preventable and/or amenable to early detection and treatment, are the leading causes of cancer-related morbidity and mortality in India. In this paper, we describe implementation science research priorities to catalyze the prevention and control of these cancers in India. Research priorities were organized using a framework based on the implementation science literature and the World Health Organization's definition of health systems. They addressed both community-level as well as health systems-level issues. Community-level or "pull" priorities included the need to identify effective strategies to raise public awareness and understanding of cancer prevention, monitor knowledge levels, and address fear and stigma. Health systems-level or "push" and "infrastructure" priorities included dissemination of evidence-based practices, testing of point-of-care technologies for screening and diagnosis, identification of appropriate service delivery and financing models, and assessment of strategies to enhance the health workforce. Given the extent of available evidence, it is critical that cancer prevention and treatment efforts in India are accelerated. Implementation science research can generate critical insights and evidence to inform this acceleration.