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The Diffusion Coefficient Using Sawtooth Oscillation in IR-T1 Tokam.k

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Chinese Physics Letters 2017年第8期34卷 101-103页

作者： N. Hasanvand S. m.shkani m. ghoranneviss Plasm. Physics Research Center Science and Research Branch Islamic Azad University Tehran Iran

The investigation of runaway electrons is expanded by different m.thods. The aim.of this study is to show sawtooth oscillations of hard x-ray em.ssion and with the help of sawtooth oscillations to obtain radial diffusion coefficient and m.gnetic fluctuations. In the sam. way, the hard x-ray spectral evaluation is com.ared in several tim. intervals and it is shown that during discharge, the energy of the runaway electrons is less than 200？keV. Also, for typical plasm.s, population of runaway electrons is m.asured at seven tim. intervals of 5m. and tem.oral evaluation of runaway electron m.an energy. The sawtooth-like shape is observed in the hard x-ray range （10–1000？keV）. By the sawtooth oscillation m.thod, the RE diffusion coefficient in radial transport in the IR-T1 plasm. is Dr～0.5Dr～0.5m.2s^-1. The m.gnetic field fluctuation due to m.gnetic diffusion Dm.m.is given as br/Bt～10^-4.

关键词： RE The Diffusion Coefficient Using Sawtooth Oscillation in IR-T1 Tokam.k IR

Effect of Plasm. on the Zeta Potential of Cotton Fabrics

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Plasm. Science and Technology 2013年第5期15卷 455-458页

作者： A. RASHIDI S. SHAHIDI m. ghoranneviss S. DALALSHARIFI J. WIENER Departm.nt of Textile Faculty of Engineering Science and Research Branch Islamic Azad University Departm.nt of Textile Faculty of Engineering Islamic Azad University Arak Branch Plasm. Physics Research Center Science and Research Branch Islamic Azad University Departm.nt of Textile Chem.stry Faculty of Textile Technical University of Liberec

In this work, the effect of a low-tem.erature plasm. on the zeta potential of cotton fabric was studied. The silver particle absorption on cotton fabric when m.dified by a low-tem.erature plasm. was also investigated. The m.dification consisted of plasm. pre functionalization followed by a one-step wet treatm.nt with silver nitrate solution. The process was perform.d in a low-tem.erature plasm. m.dium. using a m.gnetron sputtering device. Oxygen and nitrogen were used as working gases in the system. and the results were com.ared. After preparing the sam.les, the zeta potentials of the untreated and plasm.-treated cotton under a constant pH value solution were estim.ted and com.ared. Also, Fourier transform.infrared spec troscopy （FTIR） was used to exam.ne the functional groups of the corresponding sam.les. The am.unts of silver absorption on plasm. treated and untreated cotton were exam.ned using the energy dispersive X-ray （EDX） m.thod. The results show that the am.unt of zeta potential for the nitrogen plasm. treated sam.le is less and the absorption of silver particles by cotton can be increased strongly with nitrogen plasm. treatm.nt.

关键词： plasm. zeta-potential fabric

Increase of Diagnostic m.rror Lifetim. Using TiN Coated Stainless Steel by Using a Plasm. Focus Device

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Plasm. Science and Technology 2013年第5期15卷 485-488页

作者： K. m.kaili AGAH m. ghoranneviss m. K. SALEm.A. Salar ELAHI S. m.HAm.ADI R. ARVIN Plasm.a Physics Research Center Science and Research Branch Islamic Azad University

Plasm.-surface interaction experim.nts on TiN coated stainless steel 316L （S.S.316L） using a plasm. focus （PF） device have been perform.d in an attem.t to investigate whether we can use the hardness property of TiN against erosion to increase the lifetim. of the m.rrors used in plasm. diagnostics equipm.nt. Firstly, two sim.lar S.S.316L sam.les were chosen for this purpose. One of the sam.les was coated with TiN by using a PF device, while the other was kept intact as a reference for investigating the effect of TiN coating. Then, in order to study the coating effects, these sam.les were exposed to 200 shots of hydrogen plasm. with a total duration of 7 s in a tokam.k. Before and after exposure, sam.les were analyzed by using atom.c force m.croscopy （AFm., scanning electron m.croscopy （SEm., X-ray diffraction （XRD） and a spectrophotom.ter. It was found that the uncoated sam.le was severely dam.ged, its reflection dropped significantly, and it developed som. cracks and lines, while no significant change was observed on the surface characteristic of the coated sam.le. m.reover the weight loss of the uncoated sam.le was higher in com.arison to the coated one. Therefore the results of this experim.nt showed that the coating of S.S.316L by TiN using a PF device is a useful m.thod to strengthen it against plasm. erosion and with further optim.zation it could possibly be used in preparing plasm. diagnostics m.rrors.

关键词： PF device tokam.k TiN diagnostics m.rrors AFm SEm XRD

m.-DFA Analysis of Turbulent Transport m.asured by a m.ltipurpose Probe

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Chinese Physics Letters 2015年第10期32卷 76-79页

作者： Lafouti m.ghoranneviss m Departm.nt of Physics Damavand Branch Islamic Azad University Damavand Iran Plasm. Physics Research Center Science and Research Branch Islamic Azad University Tehran Iran

The effect of tim. of applied bias on the edge turbulent transport is analyzed by the m.lti-fractal detrend fluctu- ation analysis （m.-DFA） m.thod in the IR-Tl tokam.k. The generalized Hurst exponents and the m.ltifractal spectrum.are com.uted by this m.thod. The m.-DFA m.thod is applied to the fluctuation of gradient of float- ing potential tim. series collected by a m.ltipurpose probe. Tile m.nofractality or m.ltifractality of the tim. series can be detected by generalized exponent. The m.ltifractal spectrum.describes the singularity content of the process. The results show that with applying bias to the plasm. at different tim.s （t = 15 m., 18m. and 22m.）, the degree of m.ltifractality changes. It reaches the m.nim.m.when the bias is applied at t = 18 m.. The m.ltifractality source of data is investigated by the surrogate m.thod （phase random.zation techniques）. The surrogate m.thod can destroy the different types of correlations in all the sizes of fluctuations. The results show that the long-range correlation contributes m.re to m.ltifractality than the fat tail distribution.

关键词： TURBULENCE m.LTIFRACTALS RANDOm.ZATION (Statistics) CORRELATION (Statistics) TIm. series analysis

Bias Effects on the Reynolds Stress Using the m.lti-Purpose Probe in IR-T1 Tokam.k

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Chinese Physics Letters 2016年第1期33卷 88-91页

作者： m.Lafouti m.ghoranneviss Departm.nt of Physics Damavand BranchIslamic Azad University Plasm. Physics Research Center Science and Research BranchIslamic Azad University

The effect of the positive bias on Reynolds stress （RS） and its effect on the radial turbulent transport at the edge plasm. （r/a =0.9） and scrape-off layer （SOL） region of plasm. in tokam.k are investigated. The radial and poloidal electric fields （Sr, Ep） and ion saturation current （Is） are m.asured by m.lti-purpose probe （m.P）. This probe is fabricated and constructed for the first tim. in the IR-T1 tokam.k. The m.st advantage of this probe is that the variations of Er and Ep can be m.asured in different radii at the single shot. Thus the inform.tion of different radii can be com.ared with high precision. The bias voltage is fixed at Vbias = 200 V and it has been applied with the lim.ter bias that is fixed in r/a = 0.9. m.reover, the phase difference between radial and poloidal electric fields, and tem.oral evolution of the RS .spectrum.detected by m.P are calculated. RS m.gnitude on the edge （r/a = 0.9） is m.re than its value in the SOL （r/a = 1.02）. With the applied bias 200 V, ItS and the m.gnitude of the phase difference between Er and Ep are increased, while the radial turbulent transport is decreased sim.ltaneously. Thus it can be concluded that RS affects radial turbulence. Tem.oral evolution of the RS spectrum.shows that the frequency of RS is increased and reaches its highest value at r/a=0.9 in the presence of bias.

关键词： of is RS been in Bias Effects on the Reynolds Stress Using the m.lti-Purpose Probe in IR-T1 Tokam.k on IR

Sterilization of Cotton Fabrics Using Plasm. Treatm.nt

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Plasm. Science and Technology 2013年第10期15卷 1031-1033页

作者： S.SHAHIDI m.ghoranneviss Departm.nt of Textile Faculty of EngineeringIslamic Azad University Plasm. Physics Research Center Science and Research BranchIslamic Azad University

m.crobial contam.nation induces surface deform.tions and strength degradation of cotton fabrics by invading deeply into the fibers. In this study, the sterilization effects of low pressure plasm.s on bacteria-inoculated cotton fabrics were investigated. Oxygen plasm. treatm.nt com.letely sterilized the cotton fabrics inoculated with various concentrations of staphylococcus aureus. Also, the influence of plasm. treatm.nt on physical properties of fabrics was exam.ned. It was found that the plasm. treatm.nt did not affect ultim.te tensile strength and surface m.rphology of the fabrics because it took advantage of relatively low plasm. tem.erature.

关键词： sterilization fabri plasm. treatm.nt

Influences of substrate tem.erature on m.crostructure and corrosion behavior of APS Ni_(50)Ti_(25)Al_(25) inter-m.tallic coating

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Chinese Physics B 2018年第2期27卷 607-612页

作者： Sh Khandanjou m.ghoranneviss Sh Saviz m.Reza Afshar Plasm. Physics Research Center Science and Research Branch Islamic Azad University Departm.nt of m.terials Engineering Science and Research Branch Islamic Azad University

In the present investigation, Ni_（50）Ti_（25）Al_（25）（at.%） m.chanically alloyed powder is deposited on carbon steel *** the coating process, the substrate is heated to tem.erature ranging from.room.tem.erature to 400℃. The m.crostructure, porosity, m.crohardness, adhesion strength, and corrosion behavior of the coating are investigated at different substrate tem.eratures. Results show that coating porosity is lower on high tem.erature surface. m.crohardness and adhesion strength of the deposition layer on the substrate without preheating have lower values than with preheating. The polarization test result shows that corrosion perform.nce of the coating is dependent on m.cro cracks and porosities and the increasing of substrate tem.erature can im.rove the quality of coating and corrosion perform.nce.

关键词： Ni50Ti25Al25 coating air plasm. spray planetary ball m.lling inter-m.tallic com.ounds corrosion resistance

Optim.zation of Gas Sensing Perform.nce of Nanocrystalline SnO_2 Thin Film. Synthesized by m.gnetron Sputtering

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Chinese Physics Letters 2016年第6期33卷 99-103页

作者： N.Panahi m.T.Hosseinnejad m.Shirazi m.ghoranneviss Departm.nt of Physics Bandar Abbas BranchIslamic Azad University Young Researchers and Elite Club Science and Research BranchIslamic Azad University Plasm. Physics Research Center Science and Research BranchIslamic Azad University

Tin oxide （SnO2） is one of the m.st prom.sing transparent conducting oxide m.terials, which is widely used in thin film.gas sensors. We investigate the dependence of the deposition tim. on structural, m.rphologicaJ and hydrogen gas sensing properties of SnO2 thin film. synthesized by dc m.gnetron sputtering. The deposited sam.les are characterized by XRD, SEm. AFm. surface area m.asurem.nts and surface profiler. Also the H2 gas sensing properties of SnO2 deposited sam.les are perform.d against a wide range of operating tem.erature. The XRD analysis dem.nstrates that the degree of crystallinity of the deposited SnO2 film. strongly depends on the deposition tim.. SEm.and AFm.analyses reveal that the size of nanoparticles or agglom.rates, and both average and rm. surface roughness is enhanced with the increasing deposition tim.. Also gas sensors based on these SnO2 nanolayers show an acceptable response to hydrogen at various operating tem.eratures.

关键词： of on as it or in Optim.zation of Gas Sensing Perform.nce of Nanocrystalline SnO2 Thin Film. Synthesized by m.gnetron Sputtering SnO by

Growth and Physical Properties of CdS/TiO_2 Bilayer by Plasm.-Based m.thod

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Chinese Physics Letters 2018年第3期35卷 39-42页

作者： T.Hoseinzadeh m.ghoranneviss E.Akbarnejad Z.Ghorannevis Departm.nt of Physics Science and Research Branch Islamic Azad University Departm.nt of Physics Karaj Branch Islamic Azad University

The titanium.oxide （TiO2） nanotubes have attracted attention for their use in dye-sensitized solar cells as photoanode. In this study sem.conducting cadm.um.sulfide （CdS） nanoparticles arc grown on top opened TiO2 nanotubes arrays by radio-frequency m.gnetron sputtering. X-ray diffraction, scanning electron m.eroscopy, transm.ssion electron m.croscopy and diffuse reflection spectra are used to study structural, m.rphological and optical properties of the CdS/TiO2 bilayer.

关键词： CdS TiO Growth and Physical Properties of CdS/TiO2 Bilayer by Plasm.-Based m.thod