NISCAIR Online Periodicals Repository Collection: IJPAP Vol.45(08) [August 2007]
http://nopr.niscair.res.in/handle/123456789/2617
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X-ray production and ionisation cross-sections of K shell of argon by electron impact near threshold region
http://nopr.niscair.res.in/handle/123456789/30627
Title: X-ray production and ionisation cross-sections of K shell of argon by electron impact near threshold region
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<br/>Authors: Aydmol, Mahmut
<br/>
<br/>Abstract: <span style="mso-bidi-language:HI">Excitation of argon by electron impact yielded
characteristic X-rays and bremsstrahlung. They are <span style="mso-bidi-font-family:Arial;mso-bidi-language:HI">simultaneously <span style="mso-bidi-language:HI">measured and analysed for several electron impact
energy values. The X-ray yield ratio, K<sub>β1,3</sub>/K<sub>α1,2</sub><i> </i>for
the electron impact
<span style="mso-bidi-language:HI">energy values of 7 <span style="mso-bidi-font-family:
Arial;mso-bidi-language:HI">< <i><span style="mso-bidi-language:HI">E<sub>e</sub>
</span></i><span style="mso-bidi-font-family:Arial;mso-bidi-language:HI">< <span style="mso-bidi-language:HI">11 keV is equal to (0.104 ± 0.016) and is in
agreement with the given value by Salem <i>et al. Atomic Data Tables, </i>14
(1974)91. Characteristic X-ray yields of K<sub>α1,2</sub> and K<sub>β1,3</sub>
lines of argon, increase rapidly as the electron impact energy values increase
from 3,5 to 11 keV. The K shell ionisation cross-section results are compared
with an earlier experimental results on argon K shell ionisation given by
Dolgov-Savalev and Panchenko [<i>Opt-spectra </i>(1970) 575]. K shell
ionisation cross-section dependency to the electron impact energies is found to
be similar and shows rapid increase starting from near threshold energy to 11
keV. The effects of simultaneously produced competing radiationless yields on
to the K<sub>α1,2</sub><i><span style="mso-bidi-font-family:Arial;
mso-bidi-language:HI"> </span></i><span style="mso-bidi-language:HI">and K<sub>β1,2</sub>
X-ray line yields of argon, have been investigated.
</span></span></span></span></span></span></span></span>
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<br/>Page(s): 641-646Sun, 29 Jul 2007 22:58:59 GMTComplex data mapping on a binary ferroelectric liquid crystal electrically addressed spatial light modulator for target recognition
http://nopr.niscair.res.in/handle/123456789/2649
Title: Complex data mapping on a binary ferroelectric liquid crystal electrically addressed spatial light modulator for target recognition
<br/>
<br/>Authors: Goyal, Shilpi; Nishchal, Naveen K; Beri, Vinod K; Gupta, Arun K
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<br/>Abstract: For displaying a complex valued function onto a binary amplitude-only or phase-only spatial light modulator, an encoding technique is required. In this paper, we implement an encoding scheme proposed by Davis et al. [Appl Opt, 42 (2003) 2003] for optical processing the complex product function in the hybrid digital-optical correlator. The output of this correlator consists of two autocorrelation peaks along with a strong dc. Out of these three terms, our interest is in capturing only one of the correlation peaks, while discarding the other correlation peak and strong dc. For capturing only one of the correlation peaks, we multiplied a chirp function with the rotation-invariant maximum average correlation height filter. The product function, that is basically a multiplied product of the input scene’s Fourier spectrum and the chirp-encoded filter, is inverse Fourier transformed to obtain the correlation peaks. Due to chirp encoding, the correlation signals are focused in three different planes. Thus, placing our peak capturing CCD camera at a particular plane we can capture only one autocorrelation peak. Results with almost similar tank images having different energy values have also been shown.
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<br/>Page(s): 647-653Sun, 29 Jul 2007 22:58:59 GMTTwo-dimensional void probability scaling of grey tracks emitted in ²⁴ Mg-AgBr interaction at 4.5 AGeV/c
http://nopr.niscair.res.in/handle/123456789/2648
Title: Two-dimensional void probability scaling of grey tracks emitted in ²⁴ Mg-AgBr interaction at 4.5 AGeV/c
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<br/>Authors: Ghosh, Dipak; Deb, Argha; Lahiri, Madhumita Bannerjee; Datta, Ishita Sen
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<br/>Abstract: This paper presents a very rigorous study of two-dimensional void probability scaling of medium energy target protons emitted in ²⁴Mg-AgBr interaction at 4.5 AGeV/c in terms of their emission angle (θ) and azimuthal angle φ.The study indicates that the two-dimensional void probability scaling holds good for the total region of phase space.
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<br/>Page(s): 637-640Sun, 29 Jul 2007 22:58:59 GMTElectrical properties of thermally evaporated doped and undoped films of CdSe
http://nopr.niscair.res.in/handle/123456789/2645
Title: Electrical properties of thermally evaporated doped and undoped films of CdSe
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<br/>Authors: Borah, M N; Chaliha, S; Sarmah, P C; Rahman, A
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<br/>Abstract: Electrical characteristics of Ag-doped and undoped films of CdSe have been reported. The activation energies at lower and elevated temperatures have been found to be 0.22 and 0.6eV, respectively. The Sn/CdSe junction exhibits Schottky bar-rier characteristics with diode ideality factor deviating from unity. Barrier height obtained from C-V plot and J-V plot are 0.8 and 0.72eV, respectively. The junction has been endowed with high series resistance.
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<br/>Page(s): 687-691Sun, 29 Jul 2007 22:58:59 GMT