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Calculation of Lattice Relaxation in Some Substitutional Alloys Using a Green Function

100%
Das S., Datta Roy (Paul) S.
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vol. 95
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issue 3
359-366
EN
In this paper we calculate nearest neighbour relaxation in some dilute substitutional alloys using a lattice static Green function and the Morse potential function. Distant neighbour relaxation is calculated by invoking a continuum approximation. The potential parameters for the unlike interactions are calculated using simple interpolation formulae. Using the above relaxation, we calculate volume changes in the above alloys. It is observed that the simple model predicts values which are in reasonably good agreement with the experimental values in all cases. The calculated values are also compared with those obtained from the Vegard law. For Au-Ag alloy, our model reproduces both the correct sign and the magnitude of the volume change, whereas the Vegard law cannot even give the sign of the volume change. This shows the inherent strength of the present model.
2
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Spatial Resolution Test of a Beam Profile Monitoring System for the Double Electrostatic Ion Storage Ring

100%
Das S., Källberg A.
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vol. 125
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issue 1
13-17
EN
A beam profile monitoring system based on the imaging of low energy electrons created when the ion beam impinges on a metal plate was built to monitor the beam profile and to cover the wide range of beam intensities and energies for the DESIREE (Double ElectroStatic Ion Ring ExpEriment) beam line diagnostics. The spatial resolution of the system was tested with different beams of various energies and was found to be around 2 mm. A significant steering effect on the ion beam before hitting the metallic foil was observed at low energies.
3
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A Green Function Estimation of Correction to Vegard's Law for isovalent Substitutional Defects in Alkali Halide Crystals

100%
Datta Roy (Paul) S., Das S.
Acta Physica Polonica A
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2000
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vol. 97
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issue 4
671-679
EN
A Green function method is developed for estimation of lattice parameter r(χ) of an AX-BX solid solution over entire composition range (χ=0 to 1). The r(χ) obtained in the present method is different from the value r_{V}(χ) suggested by Vegard's law. We estimated the deviation from Vegard's law, r(χ)-r_{V}(χ), over entire composition range for isovalent substitutional defect in alkali halide crystals. When compared to X-ray diffraction measurements, we find that the deviation is in correct direction, variation of r(χ) with χ is consistent with experiment and the overall agreement is fairly good considering the accuracy of the experiment.
4
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Mechanical Properties of a Bainitic Steel Producible by Hot Rolling

81%
Rana R., Chen S., Haldar A., Das S.
Archives of Metallurgy and Materials
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2017
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vol. 62
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issue 4
5
Content available remote

Flame Retardant and Antimicrobial Jute Textile Using Sodium Metasilicate Nonahydrate

61%
Basak S., Samanta K. K., Chattopadhyay S. K., Das S., Narkar R., Dsouza C., Shaikh A. H.
Polish Journal of Chemical Technology
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2014
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vol. 16
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issue 2
106-113
EN
Flame retardant and antimicrobial functionalities were imparted in jute textile using sodium metasilicate nonahydrate (SMSN), commonly known as “water glass”. Sodium metasilicate nonahydrate (SMSN) was applied in jute fabric in different concentration by padding method followed by drying. Flame retardancy of the fabric was evaluated by Limiting Oxygen Index (LOI) and burning behaviour under vertical flammability tester including the char length. Burning rate was found to decrease by almost 10 times after an application of 2% SMSN compared to the control sample. Thermogravimetry (TG) and differential scanning calorimetry (DSC) analysis of both the control and treated jute fabrics were utilized to understand the mechanism of developed flame retardance in jute fabric. It was observed that the SMSN treated samples showed excellent antimicrobial property against both gram positive and gram negative bacteria. Antimicrobial properties of both the control and treated jute fabrics were also measured quantitatively.
6
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Highly Efficient Cladding Pumped Dual-Wavelength Thulium Ytterbium Co-Doped Fiber Laser

52%
Latiff A. A., Babar I., Shamsudin H., Paul M., Halder A., Das S., Bhadra S., Ahmad H., Harun S.
Acta Physica Polonica A
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2016
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vol. 130
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issue 6
1332-1335
EN
This paper describes the all-fiber dual-wavelength thulium ytterbium co-doped fiber laser by using a newly developed octagonal shaped double-clad thulium-ytterbium co-doped fiber as gain medium in conjunction with spatial filtering effect. The thulium ytterbium co-doped fiber laser operates at wavelengths of 1990.64 nm and 1998.92 nm with a signal to noise ratio of more than 34 dB as the 980 nm multimode pump power is increased above a threshold value of 1.5 W. The slope efficiency of the dual-wavelength laser is measured to be around 26.16%, which is comparable with the conventional thulium laser pumped by 800 nm single mode pump.
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