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118 results for “Laser”
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Research ArticleOpen accessIn the abstractSynthesis of Baso4 Nanoparticles by Precipitation Method Using Polycarboxylate as a ModifierMohamed El-Shahate Ismaiel Saraya, Inas Mostafa BakrProblem statement: Barium Sulfate (BaSO4) is suitable for many applications because of its whiteness, inertness and high specific gravity. Approach: Nanoparticles of barium sulphate (BaSO4) have been synthesized from barium nitrate by precipitation method in the presence of water soluble organic polycarboxylic polymer as a modifying agent. Transmission electron microscopy, Scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray powder … …Current Research in Nanotechnology, Vol. 2, Issue 1 · 29 Jul 2011 · 15,705 accessesView PDFCite
Research ArticleOpen accessIn the abstractFeasibility of Using TIG Welding in Dissimilar Metals between Steel/Aluminum AlloyRattana Borrisutthekul, Pusit Mitsomwang, Sirirat Rattanachan, Yoshiharu MutohProblem statement: Currently, in order to suppress intermetallic reaction layer formation during dissimilar metals welding between steel/aluminum alloy, only laser beam welding as self-brazing technique has been applied. However, TIG welding process might be one of welding process candidate for joining dissimilar metals welding between steel/aluminum alloys due to its capability in joining thin section. In the present study, the … …Energy Research Journal, Vol. 1, Issue 2 · 31 Oct 2010 · 14,513 accessesView PDFCite
Research ArticleOpen accessIn the abstractThe Optical Nonlinearity of Au and Ag Nanoparticle Prepared by the γ-Radiation MethodEsmaeil Shahriari, W. M.M. Yunus, Kazem Naghavi, Elias SaionProblem statement: The third order nonlinear optical properties of metal nanoparticles have been of interest in physical chemistry, medical diagnostics and optical devices. Gold colloidal nanoparticles are responsible for the brilliant reds seen in stained glass windows and silver particles are typically yellow. The purpose of the study was to determine the nonlinear refraction and absorption coefficient of the Au … …American Journal of Engineering and Applied Sciences, Vol. 3, Issue 2 · 30 Jun 2010 · 9,541 accessesView PDFCite
Research ArticleOpen accessIn the abstractFocusing of the Flow Capture for Local Exhaust Ventilation SystemsS. Y. Spotar, A. L. SorokinProblem statement: The extraction hoods commonly used as inlet element of the local ventilation systems exhibit limited emission capture over moderate distances from the source of the hazardous emissions. Proposed inclusion of a swirling peripheral jet was found to increase the effective length over which the extraction hood successfully captures harmful fumes. However information on a detailed pattern field of … …American Journal of Applied Sciences, Vol. 7, Issue 6 · 30 Jun 2010 · 7,329 accessesView PDFCite
Research ArticleOpen accessIn the abstractThe Influence of pH on Nonlinear Refractive Index of Bromophenol BlueF.Z. Henari, K.G. CulliganProblem statement: Bromophenol blue is a pH indicator, a kind of chemical that changes colour when pH goes up or down over a narrow linear dynamic range of 3.0-4.6 pH units. Therefore a good approach must be taken to extend the linear response of the indicator in order to have simple calibration and precise measurements of PH sensors. The purpose … …Physics International, Vol. 1, Issue 1 · 31 Mar 2010 · 15,948 accessesView PDFCite
Research ArticleOpen accessIn the abstractSingle Beam Z-Scan Measurements of Nonlinear Refraction and Nonlinear Absorption Coefficients in Silver Nano-FluidEsmaeil Shahriari, W. Mahmood Mat YunusProblem statement: The nonlinear refractive index and nonlinear absorption are two important optical phenomena which are extensively used in optical switching, optical limiting and labeling. Approach: In the present research we had measured nonlinearity of Ag nano-fluid prepared using γ-irradiation method. The measurement was carried out using a single beam z-scan technique. Under a CW laser beam excitation operated at … …American Journal of Engineering and Applied Sciences, Vol. 3, Issue 1 · 31 Mar 2010 · 9,635 accessesView PDFCite
Research ArticleOpen accessIn the abstractQuantum Key Distribution Using Decoy State ProtocolSellami Ali, Shuhairi Saharudin, M. R.B. WahiddinProblem statement: Quantum key distribution provides unconditional security guaranteed by the fundamental laws of quantum physics. Unfortunately, for real-life experimental set-ups, which mainly based on faint laser pulses, the occasional production of multi-photons and channel loss make it possible for sophisticated eavesdroppers to launch various subtle eavesdropping attacks including the Photon Number Splitting (PNS) attack. The decoy state protocols recently … …American Journal of Engineering and Applied Sciences, Vol. 2, Issue 4 · 31 Dec 2009 · 8,434 accessesView PDFCite
Research ArticleOpen accessIn the abstractCharacterization and Evaluation of Algaof Kaolin Deposits of Yemen for Industrial ApplicationAref A. AL-Shameri, Lei Xin RongProblem statement: The Barat-Algaof kaolin deposits are characterized and evaluated for its potentials as an industrial raw material. Approach: This research studied the total mineralogical composition of the kaolin deposit, chemical and physical properties as well as intercalation of kaolinite by urea. Using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Laser particle size, Centrifuge, data from UK (England) kaolin standard … …American Journal of Engineering and Applied Sciences, Vol. 2, Issue 2 · 30 Jun 2009 · 7,833 accessesView PDFCite
Research ArticleOpen accessIn the abstractOptical Nonlinear Proreties and Optical Limiting Effect of Metanil YellowR. K. Rekha, A. RamalingamProblem statement: The third order nonlinear optical properties of organic polymers are used in high speed telecommunication, optical limiters and optical computers. The purpose of the study was to determine the third order nonlinear characteristics and optical limiting effect of the organic dye, metanil yellow in liquid and solid medium. Approach: The samples were prepared by dissolving the dye in … …American Journal of Engineering and Applied Sciences, Vol. 2, Issue 2 · 18 Jun 2009 · 7,719 accessesView PDFCite
Research ArticleOpen accessIn the abstractCharacterization of Frequency Mode inside an Open Cavity for Different Shape RatioHallek Khouloud, Mourad Bouterra, Afif El Cafsi et al.A number of studies have referred to the existence of a vortex cell within an urban street canyon. The understanding of vortex dynamics or vorticity distribution is a such configuration is of great interest. This configuration was simulated by the interaction between a boundary layer and a cavity. Experimental characterization of the vortex structures evolution was developed by the technique … …American Journal of Applied Sciences, Vol. 5, Issue 11 · 30 Nov 2008 · 6,843 accessesView PDFCite