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Electrical and magnetic properties of 0-3 Ba(Fe_(1/2)Nb_(1/2))O_(3)/PVDF composites

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Journal of Advanced Dielectrics 2017年第6期7卷 1-11页

作者： Hars Ranjan Uttam k.Mahto k.P.Chandra A.R.kulkarni A.prasad k.prasad Aryabhatta Centre for Nanoscience and Nanotechnology Aryabhatta Knowledge University Patna 800001India Department of Physics S.M.CollegeBhagalpur 812001India Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Mumbai 400076India University Department of Physics T.M.Bhagalpur UniversityBhagalpur 812007India

Lead-free Ba(Fe_(1/2)Nb_(1/2))O_(3)/PVDF O_(3) composites were fabricated using *** technique.X-ray diffraction,scanning electron microscopy,dielectric,impedance,ac conductivity,magnetic force microscopy(MFM)and vibrating sample magne-tometer studies were undertaken to characterize the *** crstallite size of the Ba(Fe_(1/2)Nb_(1/2))O_(3) powder,estimated using Williamson-Hall approach,was found to be~42 *** fller particles of~0.5-1 pum were found to disperse in the polymer matrix of all the *** concentration dependent values of real and imaginary parts of complex permittivity showed increasing trend and were seen to follow Bruggeman and Furukawa *** data for ac conductivity exhibited negative temperature coeficient of resistance character of the test materials and were found to obey Jonscher's power *** correlated barier hopping model was found to explain satisfactorily the mechanism of charge transport occurring in the *** confirmed the presence of magnetic phases in the *** magnetization versus applied field curves indicated the possibility of magnetoelectric coupling in the ***,the present composites have shown themselves as potential multi-functional candidate materials for use in high density data storage applications.

关键词： Random composite medium dielectric properties magnetic properties effective permittivity magnetic force microscopy

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Editorial

Defence Technology（防务技术） 2015年第3期11卷 185-186页

作者： k.prasad Rao University of UTAH

Joining of materials is indeed an important aspect for both designers and *** reasons for joining are functional,structural and cost *** other technique is as widely used as welding to join materials efficiently and a... 详细信息

关键词：焊接材料编辑产品附加值机械连接制造商设计者钎焊粘接

Enhanced visible green and 1.5μm radiative emission of Er^(3+)ions in Li_(2)O-PbO-Al_(2)O_(3)-B_(2)O_(3) glasses for photonic applications

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Journal of Rare Earths 2021年第5期39卷 520-525页

作者： Nisha Deopa Mukesh k.Sahu Sumandeep kaur Aman prasad k.Swapna Vinay kumar R.Punia A.S.Rao Department of Physics Chaudhary Ranbir Singh UniversityRohtak Bypass RoadJind126102HaryanaIndia Department of Applied Physics Delhi Technological UniversityBawana RoadNew Delhi110042India Department of Physics K L Educational FoundationVaddeswaram522502Guntur(Dt.)Andhra PradeshIndia Department of Electronics and Communication Engineering Graphic Era(Deemed to be University)Dehradun248002UttrakhandIndia

A series of Er^(3+)ions doped lithium lead alumino borate(LiPbAlB)glasses were synthesized via melt quench method and their structural,physical and optical properties were ***-Ofelt theory in correlation with the emission and absorption profiles was performed for the measurement of various radiative parameters for different transitions of Er^(3+)doped *** as-prepared glasses show deep green(550 nm)as well as NIR(1532 nm)emission at 380 and 980 nm excitation wavelengths,*** intensity of emission spectra increases with Er^(3+)ions concentration up to 1.5 mol%and beyond quenching is *** Dexter theory applied to the emission profiles reveals the interaction between Er^(3+)ions as dipole-dipole in *** color coordinates are found to fall in the green region of the visible *** is observed that 1.5 mol%of Er^(3+)ions concentration is optimum to exhibit the maximum quantum efficiency,branching ratios,gain bandwidth,emission cross-section,gain crosssection and aptly suitable for visible and NIR photonic applications.

关键词： Rare earths Glasses Judd-Ofelt theory Photoluminescence Dexter theory

Herbal Medicine in Ischemic Stroke:Challenges and Prospective

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Chinese Journal of Integrative Medicine 2018年第4期24卷 243-246页

作者： Bhakta prasad Gaire Department of Herbal Pharmacology College of Korean MedicineKyung Hee University

Herbal medicines, mainly of plant source, are invaluable source for the discovery of new therapeutic agents for all sorts of human ailments. The complex pathogenesis of stroke and multifactorial effect of herbal medicine and their active constituents may suggest the promising future of natural medicine for stroke treatment. Anti-oxidant, anti-inflammatory, anti-apoptotic, neuroprotective and vascular protective effect of herbal medicines are believed to be efficacious in stroke treatment. Herbs typically have fewer reported side effects than allopathic medicine, and may be safer to use over longer period of time. Herbal medicines are believed to be more effective for the longstanding health complaints, such as stroke. Several medicinal plants and their active constituents show the promising results in laboratory research. However failure in transformation of laboratory animal research to the clinical trials has created huge challenge for the use of herbal medicine in stroke. Until and unless scientifically comprehensive evidence of the efficacy and safety of herbal medicine in ischemic stroke patients is available, efforts should be made to continue implementing treatment strategies of proven effectiveness. More consideration should be paid to natural compounds that can have extensive therapeutic time windows, perfect pharmacological targets with few side effects. Herbal medicine has excellent prospective for the treatment of ischemic stroke, but a lot of effort should be invested to transform the success of animal research to human use.

关键词： herbal medicine stroke pathogenesis medicinal plant active constituent stroke therapy

LDF based parametric optimization to model fluidized bed adsorption of trichloroethylene on activated carbon particles

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Particuology 2022年第6期20卷 72-92页

作者： Shradha Nikam Debapriya Mandal prasad Dabhade Homi Bhabha National Institute Mumbai 400094India Alkali Material and Metal Division Bhabha Atomic Research CentreMumbai 400085India

Trichloroethylene(TCE)is largely used in industries as a cleaning and degreasing *** is a potential carcinogen and is known to cause organ damage when exposed to prolonged higher *** simulation of fixed and fluidized bed adsorption of TCE can help in the development of efficient adsorption processes to prevent industrial workers in the vicinity from acute TCE *** the present work,a parametric optimization based numerical experimentation algorithm is implemented by open-source computational solvers to model fixed and fluidized bed adsorption of trichloroethylene vapors on activated *** algorithm optimizes four parameters pertaining to linear driving force(LDF)formulation of surface barrier and microporous *** optimized parameters were utilized to evaluateζ,a dimensionless number defined as the temporal and spatial average ratio of surface barrier diffusion resistance to microporous diffusion *** average value ofζis 0.139 for fixed bed operation(u/u_(mf)=0.7),1.130 for fluidized bed operation(u/u_(mf)=1),4.436 for fluidized bed operation(u/u_(mf)=1.5)and 6.317 for fluidized bed operation(u/u_(mf)=2).Therefore,the dimensionless numberζmay serve to predict the extent of change in amount adsorbed per unit adsorbent mass with change in fluidization velocity.

关键词： Fluidization Adsorption Linear driving force Parameter optimization Trichloroethylene Activated carbon

Hepatotoxic Alterations Induced by Subchronic Exposure of Rats to Formulated Fenvalerate (20% EC) by Nose Only Inhalation

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Biomedical and Environmental Sciences 2004年第3期17卷 309-314页

作者： U.MANI A.k.prasad V.SURESHkUMAR P.kUMAR kEWAL LAL B.k.MAJI k.k.DUTTA Inhalation Toxicology Laboratory and Animal House Industrial Toxicology Research Centre M. G. Marg P. Box. No.80 Lucknow-226 001 IndiaInhalation Toxicology Laboratory and Animal House Industrial Toxicology Research Centre M. G. Marg P. Box. No.80 Lucknow-226 001 IndiaInhalation Toxicology Laboratory and Animal House Industrial Toxicology Research Centre M. G. Marg P. Box. No.80 Lucknow-226 001 India Inhalation Toxicology Laboratory and Animal House Industrial Toxicology Research Centre M. G. Marg P. Box. No.80 Lucknow-226 001 IndiaInhalation Toxicology Laboratory and Animal House Industrial Toxicology Research Centre M. G. Marg P. Box. No.80 Lucknow-226 001 India

Objective Fenvalerate (20% EC) is a synthetic pyrethroid, which is commonly used in India by farmers for the protection of many food and vegetable crops against a wide variety of insects. However, its inhalation toxicity data is very limited in the literature due to the fact that the exposure levels associated with these effects were usually not reported. Hence, inhalation exposure was carried out to investigate the hepatotoxic effects. Method Adult male rats were exposed to fen for 4 h/day, 5 days a week for 90 days by using Flow Past Nose Only Inhalation Chamber. Sham treated control rats were exposed to compressed air in the inhalation chamber for the same period. Results The results indicated hepatomegaly, increased activities of serum clinical enzymes (indicative of liver damage/dysfunction) along with pronounced histopathological damage of liver. Conclusion The hepatotoxic potential of formulated Fen (20% EC) in rats exposed by nose only inhalation is being reported for the first time and warrant adequate safety measures for human beings exposed to this insecticide, particularly by inhalation route.

关键词： Fenvalerate Rat Inhalation Hepatotoxicity

Fractional Wavelet Packet Transformations Involving Hankel–Clifford Integral Transformations

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Acta Mathematica Sinica,English Series 2016年第7期32卷 783-796页

作者： Akhilesh prasad Sumant kUMAR Department of Applied Mathematics Indian School of Mines

In this paper, we introduce the fractional wavelet transformations （FrWT） involving Han- kel-Clifford integral transformation （HCIIT） on the positive half line and studied some of its basic properties. Also we obtain Parseval＇s relation and an inversion formula. Examples of fractional powers of Hankel-Clifford integral transformation （FrHClIT） and FrWT are given. Then, we introduce the concept of fractional wavelet packet transformations FrBWPT and FrWPIT, and investigate their properties.

关键词： Wavelet packet transformation fractional Hankel-Clifford integral transformation frac-tional Hankel-Clifford integral convolution wavelet

Dielectric and impedance properties of sintered magnesium aluminum silicate glass-ceramic

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Journal of Advanced Ceramics 2013年第1期2卷 71-78页

作者： Abhijit prasad Amitabha BASU Department of Applied Physics Indian School of MinesDhanbad 826004India

Magnesium aluminum silicate(MgO-Al_(2)O_(3)-SiO_(2),MAS)glass-ceramic was prepared via sintering route.X-ray diffraction(XRD)analysis indicates the formation of multiphase compound with magnesium silicate fluoride and cordierite as major *** studies of the compound shows a strong frequency dispersion of permittivity in the low frequency region followed by a nearly frequency-independent behavior in the high frequency *** presence of alkali ions(k+)in MAS glass-ceramic results in higher dielectric constant and higher *** loss(tanδ)seems to be reduced at higher frequencies after reaching the instrumental saturation at 1 *** properties of the material have been studied using a complex impedance spectroscopy(CIS)technique in a wide temperature(30-500℃)and frequency(100 Hz-5 MHz)*** complex impedance plots reveal the contribution of bulk as well as grain boundary effects in *** bulk resistance,evaluated from complex impedance spectrum,has been observed to decrease with the rise in temperature,showing a typical negative temperature coefficient of resistance(NTCR)*** smaller activation energy(Ea)of the compound within moderate temperature range suggests the presence of ions(k^(+)and F^(-))and singly ionized oxygen vacancies in the conduction *** nature of variation of the electrical conductivity,and the values of activation energy of different temperature regions,suggest that the conduction process is of mixed type.

关键词： glass-ceramic conductivity dielectric properties electrical properties

Reduced order observer based identification of base isolated buildings

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Earthquake Engineering and Engineering Vibration 2003年第2期2卷 237-244页

作者： Satish Nagarajaiah prasad Dharap Dept.of Civil and Env.Eng. Rice UnivHoustonTX 77005 USA Associate Professor Dept.of Civil and Env.Eng. Rice UnivHoustonTX 77005 USA Graduate Student

The objective of this study is to identify system parameters from the recorded response of base isolated buildings,such as USC hospital building,during the 1994 Northridge *** state measurements are not available for ***,the response is nonlinear due to the yielding of the lead-rubber *** new approaches are presented in this paper to solve the aforementioned ***,a reduced order observer is used to estimate the unmeasured ***,a least squares technique with time segments is developed to identify the piece-wise linear system *** observer is used to estimate the initial conditions needed for the time segmented identification.A series of equivalent linear system parameters are identified in different time *** is shown that the change in system parameters,such as frequencies and damping ratios,due to nonlinear behavior of the lead-rubber bearings,are reliably estimated using the presented *** is shown that the response was reduced due to yielding of the lead-rubber bearings and period lengthening.

关键词： use hospital building base isolation least squares system identification time segments reduced order observer Northridge earthquake