3,579 research outputs found
Multifunctional Magnetoelectric Materials for Device Applications
Mutiferroics are a novel class of next generation multifunctional materials,
which display simultaneous magnetic spin, electric dipole, and ferroelastic
ordering, and have drawn increasing interest due to their multi-functionality
for a variety of device applications. Since single-phase materials exist rarely
in nature with such cross-coupling properties, an intensive research activity
is being pursued towards the discovery of new single-phase multiferroic
materials and the design of new engineered materials with strong
magneto-electric (ME) coupling. This review article summarizes the development
of different kinds of multiferroic material: single-phase and composite
ceramic, laminated composite, and nanostructured thin films. Thin-film
nanostructures have higher magnitude direct ME coupling values and clear
evidence of indirect ME coupling compared with bulk materials. Promising ME
coupling coefficients have been reported in laminated composite materials in
which signal to noise ratio is good for device fabrication. We describe the
possible applications of these materials
Magnetic Effects on Dielectric and Polarization Behavior of Multiferroic Hetrostructures
PbZr0.52Ti0.48O3/La0.67Sr0.33MnO3(PZT/LSMO) bilayer with surface roughness ~
1.8 nm thin films have been grown by pulsed laser deposition on LaAlO3(LAO)
substrates. High remnant polarization (30-54 micro C/cm2), dielectric
constant(400-1700), and well saturated magnetization were observed depending
upon the deposition temperature of the ferromagnetic layer and applied
frequencies. Giant frequency-dependent change in dielectric constant and loss
were observed above the ferromagnetic-paramagnetic temperature. The frequency
dependent dielectric anomalies are attributed to the change in metallic and
magnetic nature of LSMO and also the interfacial effect across the bilayer; an
enhanced magnetoelectric interaction may be due to the Parish-Littlewood
mechanism of inhomogeneity near the metal-dielectric interface.Comment: 9 pages, 4 figure
Becnh Mark Study on The Use of Computational Fluid Dynamics for Marine Application
Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv
X-ray emission from O-type stars : DH Cep and HD 97434
We present X-ray emission characteristics of the massive O-type stars DH Cep
and HD 97434 using archival XMM-Newton observations. There is no convincing
evidence for short term variability in the X-ray intensity during the
observations. However, the analysis of their spectra reveals X-ray structure
being consistent with two-temperature plasma model. The hydrogen column
densities derived from X-ray spectra of DH Cep and HD 97434 are in agreement
with the reddening measurements for their corresponding host clusters NGC 7380
and Trumpler 18, indicating that the absorption by stellar wind is negligible.
The X-ray emission from these hot stars is interpreted in terms of the standard
instability-driven wind shock model.Comment: 13 pages ; 2 figures; 2 tables (Accepted for publication in New
Astronomy
Broad Band Optical Polarimetric Study of IC 1805
We present the BVR broad band polarimetric observations of 51 stars belonging
to the young open cluster IC 1805. Along with the photometric data from the
literature we have modeled and subtracted the foreground dust contribution from
the maximum polarization (P_{max}) and colour excess (E_{B-V}). The mean value
of the P_max for intracluster medium and the foreground are found to be 5.008
+/-0.005 % and 4.865 +/-0.022 % respectively. Moreover, the mean value of the
wavelength of maximum polarization (lambda_{max}) for intracluster medium is
0.541 +/- 0.003 micro m, which is quite similar as the general interstellar
medium (ISM). The resulting intracluster dust component is found to have
negligible polarization efficiency as compared to interstellar dust. Some of
the observed stars in IC 1805 have shown the indication of intrinsic
polarization in their measurements.Comment: 8 pages, 7 figures, Accepted for publication in MNRA
Factor affecting absorbency behaviour of woven velour printed terry fabrics
The present research work is aimed at designing the woven velour printed terry fabrics with improved overall performance. The influence of pile height, pick density and pile count (one ply and two ply both) on the water absorbency of fabric has been studied. Thirty samples have been prepared by changing variables as per Box – Behnken design of experiments. These variables are optimised for achieving high quality woven velour printed terry fabrics. The findings show that the absorbency of these fabrics increases with the increase in pile height and pick density. The results are found true for both the fabrics having one ply and two ply pile yarns. The absorbency of the fabrics having two ply pile yarn is always higher as compared to fabric having one ply pile yarn. The absorbency behaviour of these fabrics is different from the looped woven terry fabric which clearly indicates the importance of loop geometry
Generalized Fractional Integral of the Product of Two Aleph-Functions
This paper is devoted to the study and develops the generalized fractional integral operators for a new special function, which is called Aleph-function. The considered generalized fractional integration operators contain the Appell hypergeometric function F3 as a kernel. We establish two results of the product of two Aleph-functions involving Saigo-Maeda operators. On account of the general nature of the Saigo-Maeda operators and the Aleph-function, some results involving Saigo, Riemann-Liouville and Erdélyi-Kober integral operators are obtained as special cases of the main result
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