University of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Synthesis and Characterization of TiO2 Nanoparticles via Sol-Gel Method by Pulse Laser Ablation76177110888910.30684/etj.33.5B.1ENAdawiya J.HaiderNanotechnology and Advanced Materials Research Center, University of Technology/ BaghdadZainab N.JameelNanotechnology and Advanced Materials Research Center, University of Technology/ BaghdadSamar Y.TahaCollege of Science for Women, University of Baghdad /BaghdadJournal Article20150601Nanocrystalline titania powder was prepared at room temperature via sol-gel method; using TiCl4 as precursor and absolute ethanol solution. After mixing, the gel solution was formed. Then the sol-gel dried and calcined at different temperatures. The size of the prepared nanoparticles was reduced by Nd-YAG Pulse Laser Ablation (PLA). The characterization of the TiO2 Nanoparticles in two phases was carried out by X-ray Diffraction (XRD) to investigate the phase structure. The Transmission Electron Microscope (TEM) result shows the particle size of nanoparticles after laser ablation less than 10 nm. Scanning Electron Microscopy (SEM) to obtain the surface morphological studies Results showed that anatase was the only phase in titanium oxide powders up to 500 °C, when the calcination increased in the region of 900 °C the phase transformation from anatase to rutile occurred in the TiO2 nanopowders. This paper shows a comparison between two phases of TiO2 Nanoparticles (anatase and rutile). Fourier Transform Infra-Red (FTIR) to study the vibrational frequencies between the bonds of atoms for synthesized TiO2 Nanoparticles. The Crystalline size of TiO2 Nanoparticles obtained was between (15 -70) nm for anatase at 500 °C and rutile at 900 °C. In FTIR analysis, all the peaks observed were around (400-700) cm-1 due to stretching and bending vibrations.https://etj.uotechnology.edu.iq/article_108889_6e3c109dcbb68ddf01371a621511f079.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Design and temporal control study of multi-LC network medical Intense Pulsed Light (IPL) system77277810889010.30684/etj.33.5B.2ENWalid K.HamoudiLaser Physics Division, Applied Sciences Department, University of Technology/Baghdad.
Email: wjuaini2007@ yahoo.comRaid A.IsmailLaser Physics Division, Applied Sciences Department, University of Technology/BaghdadHussein A.ShakirLaser Physics Division, Applied Sciences Department, University of Technology/BaghdadJournal Article20150601Intense Pulsed Light systems employ flash lamps as optical sources to provide the required light intensity with certain temporal profile for use in a large number of medical applications; namely, the aesthetic ones. Driving a flash lamp requires high voltage DC power supply, capacitive energy storage, and flash lamp triggering unit. Single and double-mesh discharge and triggering circuits were designed and built to provide intense light pulses of variable time durations. Variable energy and duration intense light pulses needed in aesthetic medical applications were obtained. The system was treated as circuit with a light pulse profile follows the temporal behavior of the exciting current pulse. Distributing the energy delivered to one lamp on to a number of LC meshes permitted longer current pulses, and consequently, increased the light pulse length and shortened its current rise time.https://etj.uotechnology.edu.iq/article_108890_fc3e792a1d9624df654b841ae0c77fd7.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Theoretical Description for Zitterbewegung of electrons in SWCNT (Single Wall Carbon Nanotubes)77979010889110.30684/etj.33.5B.3ENM. J.MajidCollege of Education ,University of Basrah / Basrah .
Email: majid_alsamer@yahoo.comS. S.SavinskiiUdmurt State University, Izhevsk , Udmurtia , Russian FederationJournal Article20150601The problem of the time evolution of localized quantum states for electrons in the semiconducting and metallic single wall carbon nanotubes (SWCNT) are studied analytically and numerically. In the long-wave approximation , where a is the interatomic distance of carbon atoms in the graphene lattice, the carrier wave vector of the wave packet, we consider the time evolution of localized quantum states by using a model Hamiltonian. The localized quantum states are interpreted as a superposition of the valence band and the conduction band. The dynamic of the wave packet which is represented by localized quantum states in carbon nanotubes was considered with cylindrical symmetry. The time dependent average values of the angular and axial coordinate operators and its oscillations behavior are calculated. In addition, we taken into account the effect of an external magnetic field which is applied along the axis of carbon nanotube. The evaluations of the frequency and amplitude of zitterbewegung in the carbon nanotube are presented, which can be used for the experimental prospective studies in the nanoelectronic applications.<br />Heisenberg representation in the present study are used to evaluate the average values of the coordinate operators , furthermore , Schrödinger representation are used for interpreting the results of the trembling motion (Zitterbewegung) in the carbon nanotubes.https://etj.uotechnology.edu.iq/article_108891_0598b578607fd2850b8f56dc0cd22b04.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Preparation and characterization of zinc oxide nanoparticles by laser ablation of zinc in isopropanol79179810889210.30684/etj.33.5B.4ENFattin AabdulameerFadhilApplied Science Department, University of Technology/ Baghdad.Iman HassanHadiApplied Science Department, University of Technology/Baghdad.Journal Article20150601In this work preparation and characterization of a zinc metal target in isopropanol liquid at room temperature is carried out by PLAL technique at different laser fluency. The effect of laser fluencies during laser ablation process on the structure properties of the NPs is investigated.<br />We have use UV-visible spectroscopy, Atomic force microscopy and Energy dispersive X-ray (EDX) was used to evaluate the bulk atomic composition of NPs. The absorption peak of samples prepared in isopropanol solution is seen to be substantially blue shifted relative to that of the bulk zinc oxide due to the strong confinement effect. The technique offers an alternative for preparing the nanoparticles of active metal. The morphological investigation, carried out using (AFM), showed thatthe root mean square roughness is increased and the grain size of the obtained NPs are found to increase with the laser fluency.The use of isopropanol as solvent yielded spherical nanoparticles of 30–60 nm.https://etj.uotechnology.edu.iq/article_108892_a1b7521cbdeb0da2b65b46a9333411e8.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Conductance-Voltage Characteristics of Single Molecule Junction: in Resonant Tunneling Regime79981210889310.30684/etj.33.5B.5ENFouad NimrAjeelCollege of Science,Thi Qar University/Thi Qar.Jenan MajeedAL-MukhEducation for Pure Sciences College /Basarh.Lafy FarajAl-BadryCollege of Science,Thi Qar University/Thi Qar.Journal Article20150601Electronic transport characteristics through a single molecule junction are investigated by using the Keldysh non equilibrium Green function (NEGF) model. The model consists of a molecular bridge (represented by a molecular orbital) attached with two free electron reservoirs (represents two metallic leads) and it is coupled with a vibrational degree of freedom (represents a molecular vibrational mode). The behavior of the electronic transfer through the molecular junction becomes more clearly visible by studying of the conductance-voltage characteristics. The numerical calculations are done based on this model to study the changes in conductance behavior through a single molecule junction in the resonant tunneling regime. According to our results, the conductance-voltage characteristics are influenced by (I) the electron-vibration interaction, (II) the molecular bridge-leads coupling strength, (III) the junction temperature, and (IV) the molecular vibrational mode energy. We conclude that the previous parameters have a significant role in determination of the electron conduction through the single-molecule junctions. Especially, the conductance is very sensitive to the molecular bridge-leads coupling strength and the junction temperature. These features provide important information about the study of the electronic transport phenomena in molecular junctions.https://etj.uotechnology.edu.iq/article_108893_0bacd9f1d476566848ccc68e6f3821f9.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Theoretical Study of fractal shape material of negative refractive index81381810889410.30684/etj.33.5B.6ENAmer BasimShaalanCollege of Science, Al-Muthanna UniversitySami SalmanChiadCollege of Education, Al_Mustansiriyah University/ Baghdad.
Email: samichiad2003@yahoo.comNadir FadhilHabubiCollege of Education, Al_Mustansiriyah University/Baghdad.Nidhal NissanJandowCollege of Education, Al_Mustansiriyah University/Baghdad.Ammar NadalShareefCollege of Basic Education/ Al-Muthanna University/ BaghdadJournal Article20150601Advanced materials are artificial structure materials that exhibit properties not found in nature. Material that has a negative refractive index (left-handed materials) is found to get a lot of interest in the literatures. Controlling the geometry of classical material may lead to have a negative refractive index in a certain frequency range. In this paper, we utilized from fractal geometry in our design. A Sierpinski Carpet fractal model is proposed. Calculations show that this model has a negative refractive index in the frequency range 7.5 GHz – 16.5 GHz. Wide band behavior of this model refers to its fractal shape.https://etj.uotechnology.edu.iq/article_108894_4f2753443402cbc83f86c125a9ae518d.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601The heat exchange Intensification in Nano-homo junction semiconductor materials81982910889510.30684/etj.33.5B.7ENMahmood RadhiJubayerCollege of Health & Medical Technology, Middle Technical University Baghdad
E-mail: mradhi64@yahoo.comJournal Article20150601In this work, it was examined mechanisms that control internal cooling device (nano-homojunction diode)depending on thermoelectric Peltier effect, resulting in structures that are optimized thermal management. Peltier coefficient for short-length diode is theoretically investigated. It is found that the cooling power is governed by the carrier concentration, current density and the ratio of n-type region width to p-type region width. It has been determined the optimum value of the cooling power at the junction of ZnO in the optimum density at doping symmetrically on a certain value.The cooling power, temperature difference (temperature between the contact and the junction) and dimensionless figure of merit are found in this material for different thicknesses, then comparing between them. It has been simulated the homojunction diode using a MATLAB software with numerically calculated the Peltier coefficient for each layer in these diodes.It has been found that nano-homojunction introduce a significant improvement in the internal cooling performance.https://etj.uotechnology.edu.iq/article_108895_952035c9a735232a8531c768a4dadf03.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Study the Effect of the Aqueous Media on the Properties of Produced Copper Nanoparticles Colloidal by Using Laser Ablation Technique83083710889610.30684/etj.33.5B.8ENWasan MubdirKhilkhalLaser Physics Department, Babylon University, College of science for women, Hilla
Email: mubderz@yahoo.comGhaleb A.Al-DahashLaser Physics Department, Babylon University, College of science for women, HillaSahib N.Abdul WahidPhysics Department, Kufa University, College of Education for girl, Kufa.Journal Article20150601This paper reports our recent studies on the generation of Cu NPs by ablation of metal targets using Q-switch Nd-YAG laser with Second Harmonic Generation(S.H.G) (λ=532nm) immersed in different aqueous media( Double Disteled Deionised Water (DDDW) and 1-Propanol) .Higher productivity and Smallest size have been produced by using 1-propanol solution compared to DDDW, which indicated that the productivity and NPs size were affected by the solution type. Optical properties measurements showed indirect optical energy gap of the produced Cu nanoparticle (3.717 and 4.887) eV , when the solution type change from DDDW to 1-Propanol respectively. The Surface topography studied by Atomic Force Microscopy, and shape were measured by using Scanning Electron Microscope SEM shows spherical shape while the composing of the prepared nanoparticle were determined by X-ray diffraction ,UV-Visible spectroscopy has been employed for the optical properties measurements.https://etj.uotechnology.edu.iq/article_108896_ff88f47302464846aaad342b18be6b27.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Investigation of Structural, Optical and Electrical Properties of ZnO Prepared Thin Film by PLD83884710889710.30684/etj.33.5B.9ENSamer. Y.Al-DabagCollege of Science for women, University of Baghdad/ Baghdad.
Email: wwss81296@yahoo.comJournal Article20150601In this paper , Zinc Oxide (ZnO) films were grown on glass substrates by Pulsed Laser Deposition (PLD) technique at room temperature under the vacuum pressure of 3×10−3 mbar. Employing a Nd:YAG pulses laser at wavelength 1064nm was used in this technique .The effect of number of laser pulses (200,500 and 800) at annealing temperature450C oon the structural, optical and electrical properties was studied.The structure of the ZnO thin films was examined by X-Ray diffraction (XRD), it was found thatZnO thin films arepolycrystalline with many peaks, and the results of Atomic Force Microscopy (AFM) indicated that all films have grain size around 90 nm.The optical properties concerning the photoluminescence (PL) spectra were studied for the prepared thin film. From the PL, the optical gap of the ZnO thin film was determined. The Hall effect measurements confirmed that the ZnO thin films are n-type , While the number of laser pulses is increasing, the charge carriers concentration (n) increases, and Hall mobility (H) decreases.https://etj.uotechnology.edu.iq/article_108897_0bf4dfbf30928a12298d1c4ec551c809.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Judd–Ofelt analysis of Spectroscopic properties of Nd+3:SiO2 Prepared via Sol-Gel84885510890010.30684/etj.33.5B.10ENMohammed. A.HamzaCollege of sciences, Baghdad University/ Baghdad
Email: moh4691@gmail.comMajeda A.AmeenCollege of sciences, Suleymanya University/ SuleymanyaHanaa M.YaseenCollege of sciences for woman, Baghdad University/ BaghdadJournal Article20150601Doped and undoped nano particular silicate dioxide was prepared via sol–gel method under varying conditions. The optical properties of prepared samples were investigated by a variety of techniques, including X-ray diffraction, UV- Visible spectroscopy, FTIR spectroscopy and fluorescence spectroscopy. The peak of the fluorescence spectrum was recorded at the wavelength around to 1048nm, which it is close to known fluorescence peaks of Nd:YAG crystal in NIR region. A Judd-Ofelt analysis is performed to calculate the spectroscopic properties of Nd3+ions embedded in SiO2 and compare it with spectroscopic properties of Nd:YAG crystal.The conclusions behind this study show that the doped silicate samples have a high peak emission cross-section σp , which gives an acceptable indication in the direction of using Sol-Gel technique to prepare Nd:SiO2 as a solid state laser active medium.https://etj.uotechnology.edu.iq/article_108900_57f40c3b37d9a12c2280c5adf314b5b5.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601High Quantum Efficiency of (Au/n-SnO2/p-PSi/c-Si/Al) solar cell after annealing of Nd:YAG laser85686610890110.30684/etj.33.5B.11ENFiras SabeehMohammedCollege of Science, Al- Mustansiriyah University/Baghdad.Ban RashidAliCollege of Science, Al- Mustansiriyah University/ BaghdadBahaa JawadAlwanCollege of Science, Al- Mustansiriyah University/ Baghdad.Zahra SabahRashidCollege of Science, Al- Mustansiriyah University/ Baghdad.Journal Article20150601Transparent and conducting SnO2 thin film has been produced on (quartz and porous silicon) substrates using rapid photothermal oxidation of pure Sn in air at 600 oC oxidation temperature and different oxidation time. The structural properties and scan electron microscope of the prepared films were studied. The photovoltage properties of a Au/n-SnO2/p-PSi/c-Si solar cell are investigated under irradiation of Nd:YAG laser pulses. The porous Si layer is synthesized on a single crystalline p-type Si using electrochemical etching in aqueous hydrofluoric acid at a current density of 25 mA/cm2 for a 30-min etching time. The structure of the porous layer is investigated using scan electron microscope. The photovoltage properties are found to be dependent on the laser fluencies.https://etj.uotechnology.edu.iq/article_108901_48078ca5041f6b57a934cdf6f6c0dc6e.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Synthesis of TiO2/Pd/Multi-Walled Carbon Nano-Structures by Hydrothermal Technique and deposited it on n-Si substrate as TiO2/Pd/MWCNTs:n-Si Heterojunction by Pulsed Laser Deposition86788310890210.30684/etj.33.5B.12ENSaif M.AlshrefiCollege of Science for Women , Babylon University/ Babylon.
Email: Saif_master80@yahoo.comDunia K.MahdiCollege of Science ,Baghdad University/ Baghdad.Zainab S.SadikCollege of Science ,Baghdad University/Baghdad.Journal Article20150601Carbon nanostructures (CNTs) have been prepared by a Hydrothermal deposition technique based on the polymer Polyethylene glycol (PEG) dissolved in water and Ethanol alcohol of a new carbon sources materials mixed with (PdCl2) as a catalyst mixed with Sodium hydroxide (8gm NaOH) using Parr reactor at temperature (190°C) and forming the hybrid composite material (TiO2/Pd/MWCNTs) by the same way. Thence, deposited heterojunction material (TiO2/Pd/MWCNTs:n-Si) using the Pulsed Laser Deposition Technique (PLD), on the substrate of n-silicon wafer. The obtained (MWCNTs & TiO2/Pd/MWCNTs) are investigated by scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray Photo-electron Spectroscopy (XPS). Normal MWCNTs are formed multi-walled carbon nanotubes (MWCNTs) and carbon nanosheets (CNSs) but in little bit amount. MWCNTs were obtained as main products with lengths of (1.6–3 μm) and diameters of (30-60 nm) could be synthesized at as low temperature as (190°C). Deconvolution of the (C1s ) peaks which characteristic of C-C bonds, showed a main peak at (284.96 and 285.04 eV) with total amount (74.96 and 30.64 at%) for the product of MWCNTs and TiO2/Pd/MWCNTs composite respectively. Current – voltage characteristics of heterojunction showed that forward bias current change exponentially approximately with applied voltage at dark and this agreement with tunneling–recombination model. Also (I-V) characteristics under illumination of TiO2/Pd/MWCNTs heterojunction deposited on p-Si substrate (η=10.5) efficiency in Solar Cell.https://etj.uotechnology.edu.iq/article_108902_c67ad9f6889c7fc004dd73f384b25fb6.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Fabrication of electro spinning 1D ZnO Nano fibers as UVPhotoconductor88489410890310.30684/etj.33.5B.13ENRaad S.SabryScience of collage, Al-Mustansiriyah University/Baghdad
Email: raadphy_dr@yahoo.comFiras S.MohammedScience of collage, Al-Mustansiriyah University/Baghdad.Roonak Abdul SalamA.AlkareemScience of collage, Al-Mustansiriyah University/Baghdad.Journal Article20150601The electrospinning technique was used to fabricate 1D nanofibers of Zinc Oxide (ZnO). Polyvinylpyrrolidone (PVP) ̸ zinc acetate Nano fibers electrospun using solution containing PVP dissolved in ethanol and zinc acetate in distilled water were mixed, followed by calcination at 500°C for 3hours to remove the polymer. XRD pattern show the hexagonal wurtzite structure of ZnO NFs without any impurities. FESEM pictures show a network of nanofibers with diameters less than 100 nm and several micrometers in length of ZnO, these nanostructures increase the ratio of surface area to volume and improve the physical properties of the materials. The Photoluminescence (PL) of the films was studied and the energy gap and the optical properties were estimated. A photoconductor device was constructed by electroding the films with silver conducting electrode (IDE) using screen print method, The result shown that the resistance of the nanofiber films decrease dramatically when exposes to UV light. In addition, the change of conductivity with the change of wavelengths was studied also the photoconductivity was examined under different bias voltage.https://etj.uotechnology.edu.iq/article_108903_20f42821363193d9f239975375b58dcc.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Effect of additive of CuO and annealing on the Morphological and Electrical Properties of TiO2 by pulse laser deposition89590710890410.30684/etj.33.5B.14ENSabah N.MazhirCollage of Science for woman ,University of Baghdad/ BaghdadGhosoun HamidAhmedCollage of Science,University of Baghdad/ BaghdadNoha. H.HarbCollage of Science for woman ,University of Baghdad/ Baghdad
Emial: nohaharb2009@yahoo.comA. Abdallah.ACollage of Science for woman ,University of Baghdad/ BaghdadJournal Article20150601In this paper, Nano crystalline TiO2 and CuO additive TiO2 thin films were successfully deposited on suitably cleaned glass substrate at constant room temperature, and different concentration of CuO (0,5,10,15,20)% wt using pulse laser deposition(PLD) technique at a constant deposition parameter such as : (pulse Nd:YAG laser with λ=1064 nm, constant energy 800 mJ ,with repetition rate 6 Hz and No. of pulse (500).The films were annealed at different annealing temperatures 423K and 523 K. Effect of annealing on the morphological and electrical were studied. Surface morphology of the thin films has been studied by using atomic force microscopes (AFM). AFM measurements confirmed that the films have good crystalline and homogeneous surface. The Root Mean Square (RMS) values of thin films surface roughness are increased with the increase of annealing temperature. Also, The grain size increases with the increasing of concentration of CuO and annealing. The temperature dependence of the electrical conductivity and the activation energy at temperature ranging from (293-473)K of the as-deposited and films annealed at different annealing temperatures have been studied. The results show that as the film concentration of CuO and conductivity increases, while the activation energy(Ea1,Ea2) decreases. Both, the annealing and composition effects on Hall constant, RH, charge carrier concentration (NH), Hall mobility. Hall Effect are studied. Hall Effect measurements show that all films have n- type charge carriers and the concentration and annealing increases carriers concentration while the mobility decreases .https://etj.uotechnology.edu.iq/article_108904_c30a1eff0569cd3303f2984dfff51f22.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Laser annealing effect on the optical properties of CuAlO2 thin film90891710890510.30684/etj.33.5B.15ENAzhar A.HassanSchool of Applied sciences, University of Technology/BaghdadNuha F.Abd Al-RasheedSchool of Applied sciences, University of Technology/BaghdadJournal Article20150601Transparent conducting oxides thin films of copper aluminium oxide (CuA1O2) were prepared from mixture of CuCl2 and Al2Cl3 salts by spray pyrolysis technique on a glass substrate at temperature (500oC). The as-deposited film show pure delaffosite phase of CuAlO2 by XRD spectra, also many peaks of CuAlO2 were appeared after annealing at different energy fluence. The optical transmission of thin films was measured by UV-VIS spectrometer and reach to 74% in visible region. The direct and indirect optical band gaps of the films are found in the range of (3.4-3.1) eV, and (2.1-1.5) eV, respectively depending on the annealing energy fluence at (300, 600, 900, 1200) mJ/cm2.https://etj.uotechnology.edu.iq/article_108905_6e3593ac36ea0618cc59861f9ec69fa8.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Structural and Optical properties of CdO doped TiO2 thin films prepared by Pulsed Laser Deposition91893110890610.30684/etj.33.5B.16ENGhusson H.MohammedCollage of science, University of Baghdad/Baghdad
Email: ghuson,hamed@yahoo.comAhmed M.SavoreCollage of science, University of Baghdad/ BaghdadMohammed Hadi.ShinenCollage of basic education, University of BabylonKadhim A.AdemCollage of science, University of Baghdad/ Baghdad.Journal Article20150601TiO2 thin films have been deposited at room temperature with different concentration of CdO of x= (0.0, 0.05, 0.1, 0.15and 0.2) wt. % onto glass substrates by pulsed laser deposition (PLD) technique using Nd-YAG laser with λ=1064nm, energy=800mJ and number of shots=500. The structural, morphological and optical characterizations of as- deposited films were carried out using X-ray diffraction (XRD), atomic force microscopy (AFM), and UV–vis transmittance spectroscopy. The Effect of CdO content on these properties was investigated. Characterizations by X-ray diffraction show a polycrystalline film, with tetragonal structure and formation of Rutile phase and many peaks (110), (101), (111) and (211) were appear. In addition, AFM investigation shows no cracks in the formed layer. The optical properties concerning the absorption and transmission spectra were studied for the prepared thin films using an ultraviolet–visible near-infrared spectrophotometer. The results show that the transmittance of the TiO2 film in the visible domain reaches 75%.Optical band gaps were calculated and found to be (3.62, 3.54, 3.45, 3.3 and 3.21) eV for the concentration of CdO x= (0.0, 0.05, 0.1, 0.15 and 0.2) wt. % respectively. At 350 nm the refractive index,extinction coefficient and dielectric constant were determined.https://etj.uotechnology.edu.iq/article_108906_b47615abad1a11adbbd3ae981c324558.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Innovative Technique for Meeting Laser Tracking Criteria at Near and Far Ranges93293710890710.30684/etj.33.5B.17ENNahla A.AL JabbarMinistry of science & Technology / Baghdad.
Email: hushamabid@yahoo.comHisham A.MaliekMinistry of Science & Technology/, Baghdad.Dhafir AzizDhadirMinistry of Science & Technology /Baghdad.Journal Article20150601Designing Laser Detection and Tracking System (LDTS) needs meeting some certain requirements, one of these requirements is meeting tracking criteria for quadrant photodetector (QPD) at near and far detection range for the target in question through simulating these requirements. A reflecting truncated tetrahedral prism technique design and four separate photodetectors of certain shapes are introduced as a method to avoid tracking failure case.https://etj.uotechnology.edu.iq/article_108907_ef71bfc347f665d9d024330a2886a463.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Study the effect of irradiation by laser-ray on the optical properties of the nanostructure In2O3 thin films93895010890810.30684/etj.33.5B.18ENAli A.YousiCollege of Education, University of Al-Mustansiriyah/Baghdad
Email: aliyousif73@gmail.comZainab S.MahdiCollege of Education, University of Al-Mustansiriyah/ BaghdadJournal Article20150601In this research the effect oflaser irradiation N2 at 337 nm on the optical properties of the nanocrystalline In2O3 films subjected to laser irradiations with different power average (0.85, 1.70, 2.125 and 2.55mW ) for irradiation time (5min). By, by using UV-VIS spectrophotometer technique, can many of the optical properties account of study change spectral transmittance and absorbance of these membranes, such as the expense of absorption coefficient, and energy gap for direct transitions It was found that the band gap decreases when the thickness increases and the band gap values ranges between 3.5eV to 3.0eV.and calculate the reflectivity and extinction coefficient and refractive index and dielectric constant real and imaginary and optical connectivity. the exposure of the as deposited films to a selected dose of laser irradiation, the optical properties films varies with increase in the power averagehttps://etj.uotechnology.edu.iq/article_108908_3411abadbb70453c65ea6e9aab0f18e1.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Nanostructure NiO films prepared by PLD and their optoelectronic properties95195910890910.30684/etj.33.5B.19ENDoaa S.JbaierUniversity of Technology, Department of Applied Science/ Baghdad
Email:df2013df@gmail.comJehan A.SimonUniversity of Technology, Department of Applied Science/Baghdad,Khawla S.KhashanUniversity of Technology, Department of Applied Science/ BaghdadJournal Article20150601NiO thin films have compounded by pulsed laser deposition on glass and silicon (111) substrates, employing Q-switching Nd:YAG laser. Structure, grain size and optical properties have analyzed by using FTIR, AFM and UV-VIS spectroscopy. FTIR spectra conformed of NiO bonding. AFM images show the particle size about ~66nm. The optical transmission results premiered the transparency of the NiO films is greater than 70% in the visible region with optical band gap 3.85eV. The current voltage characterization of NiO/Si heterojunction has good rectifying.https://etj.uotechnology.edu.iq/article_108909_1dddfcbbb5139eaa2df54d9030f16224.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Preparation and Study Effects of Stirring Time on the Structural and Optical Properties of SnO2 Nanoparticles96097110891010.30684/etj.33.5B.20ENT. A.AL-DhahirCollege of Education for Pure Science Ibn-Al-Haithm ,University of Baghdad ,BaghdadNoor A.HameedCollege of Education for Pure Science Ibn-Al-Haithm ,University of Baghdad ,BaghdadZiyad TariqKhodairCollege of Science, University of Diala.Tagreed. M.Al-SaadiCollege of Education for Pure Science Ibn-Al-Haithm, University of Baghdad, Baghdad
Email: tagreedmm2000@gmail.comJournal Article20150601Tin Oxide nanoparticles (SnO2-NPs) were prepared by mixing (SnCl4.5H2O) with distilled water at room temperature. The samples were characterized for their crystalline structure, morphology and chemical structure by using X-ray diffraction (XRD), Rietveld refinement, scanning electron microscopy (SEM) and fourier transform infrared spectroscopy (FTIR). The XRD data and Dicvol 91 software analysis the crystal system was found to be tetragonal structure for samples prepared under stirring time for (24,48,72) h with (a=4.745 , c=3.184), (a=4.768 , c=3.255) and (a=4.776 and c=3.257) respectively. The average of crystallite size calculated by using SEM it was 9.45 nm, 14.7 nm and 21.5 nm, for the same times, previously mentioned of stirring. The effect of stirring time on the crystal lattice distortion ratio, specific surface area and dislocation density was discussed. The optical band gap values of SnO2-NPs were calculated to be about 3.4eV, 3.37eV and 3.2eV under stirring time for 24 h, 48 h and 72 h respectively by optical absorption measurement.https://etj.uotechnology.edu.iq/article_108910_810be1e8ce8d13b8e7883bfac5447b6f.pdfUniversity of Technology-IraqEngineering and Technology Journal1681-6900335B20150601Laser surface cleaning of stones and some metal objects97298310891110.30684/etj.33.5B.21ENWalid K.HamoudiApplied Science Department, University of Technology/Baghdad.
E-mail: wjuaini2007@yahoo.comMehdi S.EdanMinistry of Higher Education & Scientific Research/Baghdad.Hanan I.. IbrahimApplied Science Department, University of Technology/Baghdad.Journal Article20150601Iron, copper and stone samples were cleaned by Nd: YAG laser using different number of nano laser pulses at variable intensities. Fundamental (1.06 µm) and frequency doubled (0.53 µm) wavelengths cleaning efficiency was tested by measuring the crust and oxide removal rate. A laboratory environmental chamber was built and utilized to study the effect of processing gas on the cleaning process. Surface ref lectivity, SEM and optical microscope investigations indicated the effectiveness of Nd: YAG laser cleaning without damaging the surface. The use of high laser pulse energies helped achieving reasonably good and fast cleaning, whereas low laser energy required larger number of pulses, but ensured safe cleaning. Optimum results were obtained when using the fundamental laser wavelength under O2 environment.https://etj.uotechnology.edu.iq/article_108911_81e86340e920b7e7259a1cb18ed840a4.pdf