000			03179cam a2200337 a 4500
003			EG-GiCUC
005			20250223032640.0
008			201205s2020 ua dh f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aPh.D
099			_aCai01.24.05.Ph.D.2020.Ra.S
100	0		_aRaghda Mohamed Hosny Mohamed Salah Eldin Elsaeid
245	1	0	_aSpectrochemical analytical study of some geological rocks adopting laser techniques / _cRaghda Mohamed Hosny Mohamed Salah Eldin Elsaeid ; Supervised Mohamed Abdelharith Mohamed , Mahmoud Abdelhamid Ahmed
246	1	5	_aدراسة طيف كيميائية تحليلية لبعض الصخور الجيولوجية باستخدام تقنيات الليزر
260			_aCairo : _bRaghda Mohamed Hosny Mohamed Salah Eldin Elsaeid , _c2020
300			_a143 P. : _bcharts , facsimiles ; _c25cm
502			_aThesis (Ph.D.) - Cairo University - National Institute of Laser Enhanced Science (NILES) - Department of Laser Applicationsin Environmental Metrology, Photochemistry and Agriculture
520			_aThe present work consists of two parts, in the first part results are presented on the application of standard LIBS and Nanoparticle- Enhanced LIBS (NELIBS) to the classification of igneous and sedimentary rocks.The classification of the obtained spectra was performed using Principal Component Analysis (PCA) and Graph Theory method. The results obtained confirmed the advantages of the LIBS technique in geological applications. As a result excellent classification of the analyzed rocks can be obtained using standard LIBS coupled to Graph Theory analysis, while NELIBS spectra, analyzed with the same technique, provide acceptable results, but with 10% of the spectra not classified. These findings are particularly interesting given the application of the LIBS technique in investigating natural samples having porous and/or rough surfaces.The second part of this study introduces a detailed investigation discriminate between igneous and sedimentary rocks. The used LIBS setup was a conventional single-pulse nanosecond system with an Nd: YAG laser at two excitation wavelengths, 1064 nm and 355 nm. The LIBS spectra of the rock samples were recorded in the 200-700 nm spectral range and normalized to the irradiance for all laser wavelengths to compensate for the different laser pulse energies used.The surface hardness values of the studied samples were spectroscopically determined via the intensity ratios of the ionic - to atomic-spectral lines of iron and magnesium in igneous and sedimentary rock samples. Besides, the laser-induced plasma diagnostics, namely the plasma temperature and the electron density, were calculated from the obtained spectral data
530			_aIssued also as CD
653		4	_aGeological rocks
653		4	_aPrincipal Component Analysis (PCA)
653		4	_aXray analysis (EDX)
700	0		_aMahmoud Abdelhamid Ahmed , _eSupervisor
700	0		_aMohamed Abdelharith Mohamed , _eSupervisor
856			_uhttp://172.23.153.220/th.pdf
905			_aNazla _eRevisor
905			_aShimaa _eCataloger
942			_2ddc _cTH
999			_c79095 _d79095