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RISS 인기검색어
- 검색키워드
- 저자 : W Aslam Farooq (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Qualitative Analysis and Plasma Characteristics of Soil from a Desert Area using LIBS Technique
W Aslam Farooq,Walid Tawfik,Fahad N. AL-Mutairi,Zeyad A. Alahmed 한국광학회 2013 Current Optics and Photonics Vol.17 No.6
In this work, laser induced breakdown spectroscopy (LIBS) is used to investigate soil samples collectedfrom different desert areas of Riyadh city in Saudi Arabia. Both qualitative analysis and plasma parametersare studied via the observed LIBS spectra. These experiments have been done using a Spectrolaser-7000system with 50 mJ fundamental wavelength of Nd:YAG laser and detection delay time of 1 microsecond. Many spectral lines are highly resolved for many elements like Al, Fe, Mg, Si, Mn, Na, Ca and K. Theelectron temperatures Te and electron densities Ne, for the constituent of generated LIBS plasma, aredetermined for all the collected samples. It is found that both Te and Ne vary from one desert area toother. This variation is due to the change of the elemental concentration in different desert areas that affectsthe sample’s matrices. Time dependent measurements have also been performed on the soil samples. Whilethe signal-to-base ratio (SBR) reached its optimal value at 1 microsecond, the plasma parameters Ne andTe reach values of 4×1017cm-3and 9235 K, respectively, at 2.5 microsecond. The later indicate that theplasma cooling processes are slow in comparison to the previously observed results for metallic samples. The observed results show also that in the future it is possible to enhance the exploitation of LIBS inthe remote on-line environmental monitoring application, by following up only the values of Ne and Tefor one element of the soil desert sample using an optical fiber probe.
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Microsatellite Analysis of Rosa damascena from Pakistan and Iran
Amjad Farooq,Mahnaz Kiani,Muhammad Aslam Khan,Atif Riaz,Asif Ali Khan,Natalie Anderson,David H. Byrne 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.2
For the perfume industry, Rosa damascena is the most important species used in the production of rose attar which is made by distilling volatile oils from the petals of flowers. It is also used widely in the manufacture of rose water, as a flavoring agent. Other species like Rosa gallica L., Rosa centifolia L., Rosa × borboniana Desp. and the rose cultivar Gruss an Teplitz also exhibit the fragrance that is sought by perfumeries in the world. The main rose oil producers in the world are Turkey and Bulgaria, and they are obtaining the rose oil almost exclusively from the single clone of R. damascena. In the recent studies a wide genetic diversity for R. damascena has been revealed in Iran, but there was a need to explore and evaluate the R. damascena in the neighboring areas of Iran. Thus the new research project was planned with the objective to evaluate the genetic diversity amongst R. damascena landraces grown in Pakistan and the subsequent comparison with tested germplasm grown in Iran. Further, the study is based on the collection of Damask and selected garden roses from Pakistan, Iran and USA, determining the characterization through microsatellite markers. The SSR markers confirmed the high level of diversity of the Rosa damascena germplasm within Iran and showed that the Pakistani genotypes were similar to those from the Iranian provinces of Isfahan, Kerman and Fars. The garden rose cultivars were distantly related.
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Damage Profile of HDPE Polymer using Laser-Induced Plasma
Walid Tawfik,W Aslam Farooq,Z. A. Alahmed 한국광학회 2014 Current Optics and Photonics Vol.18 No.1
In this paper we studied the laser-induced crater depth, mass, and emission spectra of laser-ablated high-density polyethylene (HDPE) polymer using the laser-induced plasma spectroscopy (LIPS) technique. This study was performed using a Nd:YAG laser with 100 mJ energy and 7 ns pulse width, focused normal to the surface of the sample. The nanoscale change in ablated depth versus number of laser pulses was studied. By using scanning electron microscope (SEM) images, the crater depth and ablated mass were estimated. The LIPS spectral intensities were observed for major and minor elements with depth. The comparison between the LIPS results and SEM images showed that LIPS could be used to estimate the crater depth, which is of interest for some applications such as thin-film lithography measurements and online measurements of thickness in film deposition techniques.
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