Davoud Dorranian

• Professor
• Principal Investigator at Islamic Azad University, Tehran

Effects of Fermi–Dirac distributed electrons and positrons on the generation and propagation of dust acoustic shock wave (DASHW) in dense quantum magnetized dusty plasma are investigated. Plasma constituents are electrons, and positrons follow Dirac's Fermi distribution and are governed by hydrodynamic quantum equations, while ions are Maxwellian....

In this experimental study, chemical agent contaminated water was treated by the photocatalytic activity of aluminum-alumina nanocomposite. Methyl red was used as the chemical agent pollutant. Nanocomposite was synthesized by laser ablation method. The presence of both Al and Al2O3 in the structure of synthesized nanocomposite and the structural an...

The main goal of this work is to demonstrate the ability of laser irradiation to produce the Au/CuS nanocomposite. Laser ablation of gold and copper sulfide targets in distilled water and dimethyl sulfoxide produces gold and copper sulfide nano-particles, respectively. The ablations are carried out using the first harmonic generation of a pulsed Nd...

The notable impact of a trace amount of hydrogen peroxide (H2O2) on the photocatalytic performance of Ti-based metal–organic frameworks (MOFs), namely MIL-125 and NH2-MIL-125, in the purification of water polluted with chemical agents was studied experimentally. MIL-125 and NH2-MIL-125 were synthesized using the solvothermal method and were charact...

The ever-increasing expansion of chemical industries produces a variety of common pollutants, including colors, which become a global and environmental problem. Using a nanocatalyst is one of the effective ways to reduce these organic contaminants. With this in mind, a straightforward and effective method for the production of a novel nanocatalyst...

To develop the photocatalytic method of water decontamination in an industrial scale, the structure of the photocatalyst should be modified in order to work under visible light irradiation. This paper is a report on a comparison of the efficiency of the photocatalytic activity of carbon, carbon nitride (CN) and carbon-silver (CAg) nanostructures fo...

A model is presented for calculating the electric field profiles of transverse modes in fibres. Using this model, the electric field propagation of transverse modes was calculated and compared in both bent and straight Yb and Ho fibres. Our simulations revealed that the field intensities of the modes did not consistently increase or decrease by ben...

In the present study, a gold/nickel oxide (Au/NiO) nanoalloy was generated by irradiating two nano-metallic material solutions using a green laser. The produced Au/NiO nanocomposites were characterized by UV–Vis–NIR spectroscopy, an X-ray diffraction pattern, TEM and SEM imaging, and photoluminescence and DLS tests. Depending on the concentration o...

In this experimental research the adsorption and photocatalytic properties of silica nanoparticles were used to disinfection water against the gram-negative Escherichia coli bacteria. Silica nanopar-ticles were synthesized by modified Stöber method and characterized. TEM image shows that the prepared nanoparticles were spherical with 20 − 30 nanome...

Photocatalytic disinfection of Escherichia coli suspension by silicon dioxide nanoparticles and silicon dioxide/gold nanocomposite in a batch reactor is investigated experimentally and results are compared. Silica nanoparticles were synthesized by Stöber method and pulsed laser ablation method was employed to prepare gold nanoparticles in distilled...

The photocatalytic properties of reduced graphene oxide decorated ZnS nanocomposite was employed for photodegradation of phenol red as a chemical agent in water. ZnS nanocomposite was synthesized by hydrothermal method. Reduced graphene oxide decorated ZnS nanocomposite was produced by pulsed laser ablation of graphite bulk in the solution of ZnS n...

Current work is the first report on synthesizing the copper–imidazole metal–organic framework (MOF) nanostructures and its graphene nanocomposites by pulsed laser ablation (PLA) process in liquid environment. 3 samples of copper–imidazole (Cu–I) MOF nanostructures were synthesized by irradiation of a copper metal target in dimethylformamide (DMF) s...

This experimental study’s main goal is to investigate the impact of various silver concentrations on the optical characteristics of Agshell/Aucore bimetallic nanoparticles. By using the pulsed laser ablation in liquid (PLAL) technique on the gold target at the bottom of the container full of silver colloids, the silver/gold nanoparticles are ablate...

The primary objective of this experimental research is to introduce the capacity of laser irradiation into the synthesis of bimetallic nanoparticles from noble metals. The wavelength and volumetric ratio of solutions are the experiment's variables. Au and Ag nanoparticles are produced through the laser ablating gold and silver targets in distilled...

Mn3O4 (hausmannite) nanoparticles were synthesized by pulsed laser ablation (PLA) method in liquid environment and deposited on aluminum substrate by direct current electrophoretic deposition (DC-EPD) technique. The effects of deposition voltage and time on the characteristics of films were studied by a variety of diagnostic methods. The X-ray diff...

The main purpose of this experimental research is to study the effects of different silver concentrations on the optical properties of bimetallic Ag shell /Au core nanoparticles. The gold nanoparticles are ablated by the PLAL technique of the gold target on the bottom of the container. The container is filled with colloidal silver nanoparticles and...

I would like to draw your attention to our article “Optical properties of synthesized Au/Ag Nanoparticles using 532 nm and 1064 nm Pulsed Laser Ablation: Effect of Solution Concentration“ in the European Journal of SN applied science. Thank my co-authors, Dr. Amir Hossein Sari, Dr. Davoud Dorranian and Ms. Elham Mohebi for their help and all the ha...

Effects of the deposition time and voltage on the characteristics of gold nanoparticles (NPs) thin films, prepared by the electrophoretic deposition (EPD) method on the silver substrate, were investigated experimentally. Au NPs were synthesised using the pulsed laser ablation method in distilled water. The suspended solution of the gold NPs was use...

The impact of Fermi–Dirac distributed electrons and ions on the features of dust acoustic double layers in a four-component magnetized dusty plasma was investigated. In this model, the plasma consists of Fermi–Dirac distributed electrons and ions and negative and positive dust particles. The plasma species experience electrical, magnetical, and sel...

Impacts of the liquid environment on the characteristics of pulsed laser ablation (PLA) in liquid synthesized tungsten (W) nanostructures have been investigated. High purity W target was irradiated by the fundamental harmonic of a Q-switched Nd: YAG laser of 7 ns pulse width and 1 J/cm 2 laser fluence in different liquid environments including dist...

Four different photonics based methods to produce Au-TiO 2 nanocomposite have been introduced and experimental results have been investigated. These methods include "production of one species of nanoparticles in the suspension of another one", "post irradiation of the mixture of nanoparticles at the wavelength of gold plasmonic absorption", "post i...

The use of porous carbon materials for fabrication of high-performance supercapacitors has attracted significant attention in recent years especially for applications in supercapacitors. In the present work, carbon nanoparticle is successfully fabricated by the home-made thermal plasma system and acetylene gas as the raw materials. To achieve this,...

Fabrication of magnesium oxide nanostructures from aqueous solution of magnesium chloride salt, by thermal plasma method, has been investigated and effects of cooling temperature as well as concentration of salt in the aqueous solution on the properties of synthesized nanostructures were studied experimentally. Three mechanisms of cooling include c...

In this study, CdS, CuS, and Ag2S nanoparticles (NPs) were synthesized by a chemical bath procedure in the presence of polyvinyl alcohol (PVA) as a polymer stabilizer. Morphological studies followed by X-ray diffraction (XRD) and atomic force microscopy (AFM) revealed monolithic and small size NPs. The average crystalline size of CdS, Ag2S, and CuS...

Fabrication of MgO/MgAl2O4 nanocomposites from aqueous solution containing a combination of magnesium chloride (MgCl2) and aluminum chloride (AlCl3) salts by the plasma torch method has been investigated and the effect of relative concentration of these two salts in aqueous solution on the quality of synthesized nanocomposites was studied experimen...

The role of laser fluence on the properties of graphene/CuO nanocomposite, prepared by pulsed laser ablation method was studied experimentally. Ablation processes were carried out with the fundamental wavelength of a Q-switched Nd:YAG laser. First, the graphene nanosheets were synthesized by irradiation of a graphite target in distilled water. Then...

A simple and green method to decorate graphene nanosheets is introduced, according to laser ablation of graphite target in TiO2 nanoparticle suspension. TiO2 nanoparticles were synthesized by laser ablation of a high purity titanium target in distilled water with the fundamental wavelength of pulsed Nd:YAG laser at 7 ns pulse width. 4 samples of gr...

We present a new theoretical model for analyzing the impact of higher order modes on transverse mode instability in bent Yb-doped fiber amplifiers. The model indicates a comparative analysis of mode instability using the normalized propagation constant in both straight and bent fibers amplifiers. The impact of different bending radii, on bent fiber...

The existence and polarity of dust acoustic double layers (DADLs) in a magnetized self-gravitating opposite polarity dusty plasma (OPDP) have been investigated. The constituents of the OPDP model are two species of positively and negatively charged dust grains, Maxwellian electrons, and nonextensive distributed ions. Employing the reduction perturb...

The capability of laser ablation method in producing gold/iron oxide nanocomposite was studied experimentally. At first, Au and FeO nanoparticles (NPs) were synthesized in distilled water by laser ablation method. The fundamental wavelength of a Q-switched Nd:YAG laser with 6 ns pulse width was employed to synthesize nanoparticles. Then mixtures of...

In this paper, the transverse mode instability of three different high power silica fiber amplifiers doped with rare earth ions, Ytterbium, Thulium and Holmium is compared. Mode instability in these amplifiers has been investigated using the normalized propagation constant model in straight and bent fibers. The behavior of three amplifiers with dif...

In this paper, the transverse mode instability of three different high power silica fiber amplifiers doped with rare earth ions, Ytterbium, Thulium and Holmium is compared. Mode instability in these amplifiers has been investigated using the normalized propagation constant model in straight and bent fibers. The behavior of three amplifiers with dif...

In this research optical properties of synthesized gold-graphene/polyvinyl alcohol (AuG/PVA) nanocomposite have been investigated. Gold and graphene nano colloidal solution (NCS) synthesized by laser ablation method individually. The resulting NCS were characterized by UV-Vis absorption spectroscopy, scanning electron microscopy (SEM), and transmis...

ABSTRACT In the present work, nickel oxide nanoparticles (NPs) have been synthesized, using the laser ablation technique in aqueous suspension. By applying the electrophoretic deposition (EPD) method with direct current (DC), the nickel oxide NPs obtained have been deposited on an aluminium substrate. During the EPD process, different films have be...

One of the challenges in optogenetic technique is the transmission of light to different areas of brain tissue with minimal damage. In this paper, the design and fabrication of a new type of polymer optical fiber with flexible and degradable biocompatible step-index for the delivery of light with a diameter of 1400 μm and lengths of 3 cm and 7 cm i...

A simple and green method to decorate graphene nanosheets is introduced, according to laser ablation of graphite target in TiO2 nanoparticle suspension. TiO2 nanoparticles were synthesized by laser ablation of a high purity titanium target in distilled water with the fundamental wavelength of pulsed Nd:YAG laser at 7 ns pulse width. 4 samples of gr...

Influence of transverse magnetic field on the nickel produced plasma plume and structural and optical properties of nickel oxide nanoparticles produced by pulsed laser ablation (PLA) method have been investigated experimentally. Ablation container was placed between the poles of permanent magnets. Strength of external magnetic field was controlled...

Capability of pulsed laser ablation (PLA) in liquid environment as a physical bottom-up method to synthesis metal–organic framework MOF-5 has been investigated experimentally for the first time. In this experiment, a high-purity zinc (Zn) target was irradiated by the fundamental wavelength of a pulsed Nd:YAG laser in a solution of dimethylformamide...

In this research work, ZnO nanoparticles were produced by pulsed laser ablation method, employing the fundamental wavelength of pulsed Nd:YAG laser of 1064 nm and 7 ns pulse width in deionized water. Four sizes of nanoparticles were produced using different pulse numbers of laser. Simultaneously cotton fabric samples were placed near the Zn target...

Effects of DC magnetic field in the range of 0–180 mT on the properties of cobalt oxide nanoparticles (Co3O4 NPs) synthesized by pulse laser ablation method in distilled water has been investigated. Ablation was carried out in the presence of permanent magnets with variable strengths. Significant blue shift in excitonic absorption peaks of produced...

A simple and green method to decorate graphene nanosheets is introduced, according to laser ablation of graphite target in TiO2 nanoparticle suspension. TiO2 nanoparticles were synthesized by laser ablation of a high purity titanium target in distilled water with the fundamental wavelength of pulsed Nd:YAG laser at 7 ns pulse width. 4 samples of gr...

Metal organic framework (MOF) is an important class of highly porous hybrid materials with its unique structures and properties. A bismuth-based MOF was prepared by pulsed laser ablation in liquid environment as a physical bottom-up method for the first time. The experiment involved the ablation of a bismuth target in a solvents with the fundamenta...

The objective of this study is to investigate the effects of liquid environment on the properties of TiO2 nanoparticles. TiO2 nanoparticles were synthesized by pulsed laser ablation method in distilled water, acetone, and CTAB. To investigate the structural properties of samples X-ray diffraction pattern, transmission electron microscopy, and scann...

Tungsten sub-oxide (W17O47) nanoparticles were produced for the first time, via pulsed laser ablation of a pure tungsten target in distilled water. The beam of a Q-switched Nd:YAG laser of 1064 nm wavelength with 0.6, 0.8, 1.2 and 1.4 J/cm2 fluences was employed to irradiate the target. Produced nanoparticles were characterized using field emission...

The present study is dedicated to investigate the effects of ablation environment on the characteristics of carbon nanostructures synthesized by pulsed laser ablation method; particularly for graphene and Graphene Oxide (GO) nanosheets. The beam of a Q-switched Nd:YAG laser of 532 nm wavelength at 7 ns pulse width and 0.5 J/cm² fluence is employed...

Gold nanoparticle thin films were deposited on copper substrate using electrophoretic deposition (EPD) method. At first, gold nanoparticles were synthesized, using pulsed laser ablation method of a high-purity gold target in distilled water. Ablation was carried out, employing the fundamental wavelength of a Q-switched Nd:YAG laser at 1064 nm and p...

In the present work, the effects of deposition time and applied voltage on the quality of cobalt nanoparticle film, deposited on aluminium substrate have been investigated experimentally. Cobalt oxide nanoparticles were produced by laser ablation method. The produced nanoparticles were deposited on aluminium substrate with electrophoretic depositio...

Background and objective: Non-thermal methods are suggested for decontamination of spices to preserve safety and quality of the products. In this study, effects of atmospheric pressure floating-electrode dielectric-barrier discharge plasma were investigated on red pepper powder, compared to gamma irradiation. Material and methods: To achieve the o...

Effects of liquid environment on the characteristics of graphene nanosheets produced by the laser ablation method have been studied experimentally. The fundamental wavelength of a pulsed Nd:YAG laser at 1064 nm with 7 ns pulse width and 5 Hz repetition rate was employed to irradiate a graphite target in distilled water, liquid nitrogen, alcohol, ac...

Effects of laser fluence on properties of pulsed laser ablation-produced nickel (Ni) nanoparticles have been studied experimentally. In this experiment, the output pulse of a Nd–YAG laser at 1064-nm wavelength and 7-ns pulse width with four different fluences was employed to irradiate a high purity Ni bulk in distilled water. Productions were studi...

The role of laser fluence in producing cobalt oxide nanoparticles in distilled water by laser ablation method has been studied experimentally. Output of a pulsed Nd:YAG laser of 1064 nm wavelength and 7 ns pulse width with 10 Hz repetition rate was employed to irradiate a high purity cobalt bulk in distilled water. According to results, size of pro...

This paper deals with the repetitively pulsed spark discharges over the water surface by studying both the electrical and the spectroscopic aspects. Detailed discharge electrical parameters, vibrational and rotational temperatures, and electron density measurements for nine different conditions of input frequencies and voltages over the water surfa...

In this research work, TiO 2 nanoparticles were in situ synthesized on cotton fabrics using laser ablation method. For producing the TiO 2 nanoparticles, the Ti plate were irradiated with Nd:YAG pulsed laser operating at 1064 nm in deionized water medium. Simultaneously, the cotton samples were placed near Ti plate in ablation container. Laser flue...

Effects of variable dust size, mass and charge on the characteristics of nonlinear dust acoustic solitary waves (DASW) in a two-temperature ion dusty plasma have been studied analytically. Plasma ions are assumed to be Maxwellian while plasma electrons are nonextensively distributed. Mass and electrical charge of dust particles are assumed to be pr...

The effect of laser fluence on the characteristics of carbon nanostructures produced by pulsed laser ablation has been investigated. The beam of a Q-switched Nd:YAG laser of 1064 nm wavelength at 7 ns pulse width and different fluences was employed to irradiate the graphite target in distilled water. The X-ray diffraction pattern, transmission elec...

Production and characterization of gold/silicon nanocomposites have been investigated experimentally, using laser ablation method. Firstly Si nanoparticles and Au nanoparticles were synthesized by ablation of their bulk in deionized water with the fundamental wavelength of Nd:YAG pulsed laser separately. Then the produced Au nanoparticles and Si na...

In this experimental study, Cd (OH)2/CdO nanostructures were produced by pulsed laser ablation method. The beam of a Q-switched Nd:YAG laser with wavelength of 1064 nm at different fluences was employed to irradiate the cadmium target in distilled water. The obtained products at different fluences of laser pulse were characterized by UV–Vis-NIR spe...

In this experimental research, the silver nanoparticles were synthesized on cotton fabric using laser ablation method in the same bath. Also the effects of the size of silver nanoparticles (NPs) on the structural and antibacterial properties of silver NP-coated cotton fabric have been investigated experimentally. A pulsed laser beam was used for sy...

ZnO nanoparticles were produced by pulsed laser ablation of a high purity (99.99%) zinc metal target in different concentration of CTAB solution. A Q-switched Nd:YAG laser operating at wavelengths of 1064 nm with pulse width of 7 ns and 10 Hz repetition rate was employed to irradiate the Zn target in CTAB. Produced nanoparticles were characterized...

The thermally induced optical bistability in prepared silver (Ag) nanosuspensions have been studied experimentally, using Fabry–Perot and Mach–Zehnder interferometry methods. Two Ag nanosuspensions of different sizes were produced by different fluences of pulsed laser ablation method in distilled water. The pulsed Nd:YAG laser of 7 ns pulse width,...

Production and characterization of Au/graphene nanocomposite using laser ablation method are investigated experimentally. First, graphene nanosheets and Au nanoparticles were synthesized by irradiating their bulk in deionized water with the fundamental harmonic of Nd:YAG-pulsed laser separately. Then, composition of four different volumetric ratios...

In this work, graphene nanosheets and carbon nanoparticles were synthesized by nanosecond pulsed laser ablation in liquid nitrogen using Q-switched Nd:YAG laser. The aim is to investigate the wavelength dependence of carbon nanostructures formation mechanisms using fundamental and second harmonic of Nd:YAG laser irradiations at different laser flue...

ABSTRACT: Ameiotic study was performed on Brassica napus exposed to electromagnetic elds. Our investigation used plants grown from dry pretreated seeds with 10 mT for 4 h, wet pretreated seeds with 10 mT for 2 h, and a control line. A lower seed yield was produced in the plants grown from exposed grains. However, the weight of 1000 seeds were highe...

A pair of copper bromide lasers in an oscillator–amplifier configuration was used to investigate the small-signal gain and saturation intensity as amplifying parameters in terms of pulse repetition frequency. Some fluctuations in the laser output power were recorded by varying the excitation frequency from 13 to 29 kHz as well as the amplifying par...

In this experimental investigation, silicon nanoparticles and graphene nanosheets suspensions were produced by the pulsed laser ablation in distilled water separately. Then graphene and silicon were mixed in different volumetric ratio and irradiated by UV radiation to produced graphene/silicon nanocomposites. In order to characterize the structural...

The fundamental wavelength of a Q-switched pulsed Nd:YAG laser was employed to produce Au and copper oxide nanoparticles via pulsed laser ablation method in water. Different volumetric ratio of nanoparticles were mixed and irradiated by the second harmonic pulses of the Nd:YAG laser to prepare Au/Copper oxide nanocomposite. The experimental investi...

In this work, the effects of liquid environments on the characteristics and optical properties of carbon nanostructures-in particular, Graphene Oxide (GO)-prepared by pulsed laser ablation were studied experimentally. The second harmonic beam of a Q-switched Nd:YAG laser of 532 nm wavelength at 6 ns pulse width and 0.7 J/cm 2 fluence was employed t...

In this work, the synthesis and properties of the graphene/silicon nanocomposites as a function of volumetric ratio of Si nanoparticles and graphene nanosheets suspensions has been investigated experimentally. Firstly the silicon nanoparticles and graphene nanosheets suspensions were synthesized by pulsed laser ablation method with Q-switched Nd:YA...

We have studied the effects of laser fluence on the characteristics of graphene nanosheets produced by pulsed laser ablation technique. In this work, The second harmonic of a Q-switched Nd:YAG laser at 532 nm wavelength and 5 Hz repetition rate with different laser fluences in the range of 0.5–1.8 J/cm² was used to irradiate the graphite target in...

Tantalum nanoparticles (Ta NPs) were synthesized in ethanol solution by ablation with a 1064 nm Nd:YAG laser. Prepared NPs were investigated by UV-visible absorption spectroscopy, Transmission electron microscopy, X-ray diffraction and Photoluminescence measurement. The average sizes of NPs were calculated to be in the range of 12–18 nm. From the U...

Effects of the concentration of cetyltrimethylammonium bromide (CTAB) on the properties of graphene nanosheets produced by laser ablation method in CTAB medium have been studied experimentally. The beam of a Q-switched Nd:YAG laser of 1064 nm wavelength at 7 ns pulse width with 1.5 J/cm² fluence was employed to irradiate the graphite target in diff...

Effects of plasma nonextensivity on the nonlinear cnoidal ion-acoustic wave in unmagnetized electron-positron-ion plasma have been investigated theoretically. Plasma positrons are taken to be Maxwellian, while the nonextensivity distribution function was used to describe the plasma electrons. The known reductive perturbation method was employed to...

In this study, the effect of oxygen content on a thin copper oxide layer deposited on BK7 and steel substrates by DC magnetron sputtering were investigated. Argon as working gas with impurity of 99.9% and various oxygen ratios were used to sputter a pure Cu cathode target in a cylindrical geometry. The produced samples were analyzed by X-ray diffra...

A pair of copper bromide laser in an oscillator–amplifier configuration was used to investigate the small signal gain and saturation intensity as amplifying parameters, versus delay time of triggering between lasers. The maximum amplifying parameters and output power of 0.07 cm⁻¹, 43 μJ cm⁻², and 9 W were measured, respectively at optimum delay tim...

Effects of nonthermal electrons and positrons on the nature of ion acoustic cnoidal wave in the plasma contains ions, positrons, and electrons are investigated. Reductive perturbation method was employed to solve the fluid dynamic equations with appropriate boundary condition and derivation of Korteweg-de Vries (KdV) equation for nonlinear periodic...

In this study the influence of the concentration level of cetyl trimethyl ammonium bromide (CTAB) as the ablation environmental medium on the characteristics of graphene oxide nanosheets, produced by laser ablation method has been surveyed. The second harmonic of a Q-switched Nd:YAG laser at 532 nm wavelength and 7 ns pulse width and 0.5 J/cm² flue...

A new analytical approach for bubble deformation was used for optimization of the electron acceleration in the 3D highly nonlinear laser wake-field regime. Injection of the electron bunch with initial velocity in the bubble was considered in the inhomogeneous plasma with linearly density ramp. The researchers show that deformation of the bubble sha...

A new analytical approach for bubble deformation was used for optimization of the electron acceleration in the 3D highly nonlinear laser wake-field regime. Injection of the electron bunch with initial velocity in the bubble was considered in the inhomogeneous plasma with linearly density ramp. The researchers show that deformation of the bubble sha...

Effects of laser fluence on the characteristics of copper sulfide (CuS) nanoparticles (NPs), produced by laser ablation method have been investigated experimentally. CuS nanoparticles were synthesized by the pulsed laser ablation of a high purity copper bulk in dimethyl sulfoxide (DMSO). Pulses of a Q-switched Nd:YAG laser of 1064 nm wavelength at...

In this work, the creation of the omnidirectional band gap (OBG) in a tunable full plasma photonic crystal has been investigated theoretically. The full plasma photonic crystal is made of the bulk cold plasma which is embedded in the DC periodic magnetic field. The influence of the periodic external magnetic field leads to periodic changes of plasm...

The effects of water temperature on the characteristics of ZnO nanoparticles produced by laser ablation method in water were investigated experimentally. The nanoparticles were prepared by pulsed laser ablation of a zinc metal target in distilled water at different temperatures. The synthesized ZnO nanoparticles were characterized using X-ray diffr...

In this study, the effects of gliding arc (G Arc) plasma system on the treatment of water have been investigated experimentally. An AC power supply of 15 kV potential difference at 50 Hz frequency was employed to generate plasma. Plasma density and temperature were measured using spectroscopic method. The water was contaminated with staphylococcus...

A facile chemical reduction method was used to synthesize ZnO nanoparticles (NPs) in ethylene glycol solvent at two different calcination temperatures. As a result of variation in the calcination temperature, ZnO NPs with two different sizes were achieved. The NPs were investigated for their structural and optical characteristics using X-ray diffra...

Effect of the temperature of water as the ablation environment on the characteristics of TiO2 nanoparticles produced by laser ablation process in water has been investigated experimentally. The fundamental wavelength of a Q-switched Nd:YAG laser was employed to irradiate a high purity Ti plate in distilled water at different temperatures of 0, 20,...

A pair of copper bromide lasers in an oscillator–amplifier configuration was used to investigate the temperature dependence of the small-signal gain, saturation intensity, and output power of the laser. The observations were explained in terms of the electron temperature and energy levels of transition. An optimum electrical input power of 1.6 kW a...

A copper bromide vapour laser with a high pulse repetition rate D V Shiyanov, Gennadii S Evtushenko, V B Sukhanov et al. Analytic study of the temperature profile in a copper bromide laser I P Iliev, S G Gocheva-Ilieva and N V Sabotinov A high power, segmented metal, copper bromide laser E S Livingstone and A Maitland Peculiarities of pumping of co...

Effects of the obliqueness and the strength of external magnetic field on the ion acoustic (IA) cnoidal wave in a nonextensive plasma are investigated. The reductive perturbation method is employed to derive the corresponding KdV equation for the IA wave. Sagdeev potential is extracted, and the condition of generation of IA waves in the form of cno...

Effects of high frequency spark plasma discharge as a time efficiency method in order to softening the natural hard water has been investigated experimentally. A very hard water sample with 331±19 mg/l of CaCO3 hardness was used. The current and voltage of each spike was about 9.6 A and 3.5 kV respectively at 16 kHz frequency with 35 s pulse width...

We studied the effect of oxygen on decontamination of cumin seeds by atmospheric pressure dielectric barrier discharge (DBD) plasma. A peak-to-peak 15-kV radiofrequency power supply at 17-kHz frequency was used to generate Ar and Ar-O2 plasmas between two circular electrodes. Electrodes were covered by mica plates with a 5-mm gap between each plate...

In this study, the oblique incident of the electromagnetic waves with frequencies lower than plasma frequency in one dimensional ternary plasma photonic crystal has been investigated. The unit cell of crystal contains a plasma layer that is embedded in two different dielectric layers. Using the wave equation, Bloch theory, and boundary condition, t...

Linear and nonlinear optical properties of Polyvinyl Alcohol thin film doped with aluminum nanoparticles have been investigated experimentally. Aluminum nanoparticles were produced using pulsed laser ablation method. The fundamental wavelength of Nd-YAG laser at 7 ns pulse width was employed to produce aluminum nanoparticles in water at different s...

Effect of the water temperature on the characteristics of zinc oxide nanoparticles (NPs) produced by laser ablation process is investigated experimentally. The fundamental wavelength of a Q-switched Nd:YAG laser was employed to irradiate a high-purity zinc plate in distilled water at different temperatures of 0, 20, 40 and 60∘C. The produced NPs we...

An analytical model for the interaction of charged particle beams and plasma for a wakefield generation in a parabolic plasma channel is presented. In the suggested model, the plasma density profile has a minimum value on the propagation axis. A Gaussian proton beam is employed to excite the plasma wakefield in the channel. While previous works inv...