425 research outputs found
Superconducting Mechanism through direct and redox layer doping in Pnictides
The mechanism of superconductivity in pnictides is discussed through direct
doping in superconducting FeAs and also in charge reservoir REO layers. The
un-doped SmFeAsO is charge neutral SDW (Spin Density Wave) compound with
magnetic ordering below 150 K. The Superconducting FeAs layers are doped with
Co and Ni at Fe site, whereas REO layers are doped with F at O site. The
electron doping in SmFeAsO through Co results in superconductivity with
transition temperature (Tc) maximum up to 15 K, whereas F doping results in Tc
upto 47 K in SmFeAsO. All these REFe/Co/NiAsO/F compounds are iso-structural to
ZrCuSiAs structure. The samples are crystallized in a tetragonal structure with
space group P4/nmm. Variation of Tc with different doping routes shows the
versatility of the structure and mechanism of occurrence of superconductivity.
It seems doping in redox layer is more effective than direct doping in
superconducting FeAs layer.Comment: 4 Pages text + Figs: ([email protected]
A Survey on Emulation Testbeds for Mobile Ad-hoc Networks
AbstractMobile Ad hoc Network (MANET) can be said as a collection of mobile nodes, which builds a dynamic topology and a A resource constrained network. In this paper, we present a survey of various testbeds for Mobile Ad hoc Networks. Emulator provides environment without modifications to the software and validates software solutions for ad hoc network. A field test will show rather the simulation work is going on right track or not and going from the simulator to the real thing directly to analyze the performance and compare the results of routing protocols and mobility models. Analyzing and choosing an appropriate emulator according to the given environment is a time-consuming process. We contribute a survey of emulation testbeds for the choice of appropriate research tools in the mobile ad hoc networks
Structural, Magnetic and Magneto-caloric studies of Ni50Mn30Sn20Shape Memory Alloy
We have synthesized a nominal composition of Ni50Mn30Sn20 alloy using arc
melting technique. Rietveld refinement confirms the austenite L21 structure in
Fm-3m space group. Electrical resistivity has been found to clearly exhibiting
two different phenomena viz. a magnetic transition from paramagnetic to
ferromagnetic and a structural transition from austenite to martensitic phase.
Thermo-magnetization measurements M(T) confirms ferromagnetic transition
temperature TC at 222 K and martensitic transition starting at 127 K(MS).
Magnetization measurement M(H) at 10 K confirms the ferromagnetic state.
Frequency dependence of ac susceptibility \c{hi}' at low temperature suggests
spin glass behavior in the system. The isothermal magnetic entropy change
values have been found to be 1.14 J/Kg.K, 2.69 J/Kg.K and 3.9 J/Kg.K, with
refrigeration capacities of 19.6 J/kg, 37.8 J/kg and 54.6 J/kg for the field
change of 1, 2 and 3 Tesla respectively at 227 K.Comment: 16 pages text + Figs. Ni50Mn30Sn20 alloy: reasonable refrigeration
capacity tunable to Room
RCCNet: An Efficient Convolutional Neural Network for Histological Routine Colon Cancer Nuclei Classification
Efficient and precise classification of histological cell nuclei is of utmost
importance due to its potential applications in the field of medical image
analysis. It would facilitate the medical practitioners to better understand
and explore various factors for cancer treatment. The classification of
histological cell nuclei is a challenging task due to the cellular
heterogeneity. This paper proposes an efficient Convolutional Neural Network
(CNN) based architecture for classification of histological routine colon
cancer nuclei named as RCCNet. The main objective of this network is to keep
the CNN model as simple as possible. The proposed RCCNet model consists of only
1,512,868 learnable parameters which are significantly less compared to the
popular CNN models such as AlexNet, CIFARVGG, GoogLeNet, and WRN. The
experiments are conducted over publicly available routine colon cancer
histological dataset "CRCHistoPhenotypes". The results of the proposed RCCNet
model are compared with five state-of-the-art CNN models in terms of the
accuracy, weighted average F1 score and training time. The proposed method has
achieved a classification accuracy of 80.61% and 0.7887 weighted average F1
score. The proposed RCCNet is more efficient and generalized terms of the
training time and data over-fitting, respectively.Comment: Published in ICARCV 201
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