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Evolution of plasma parameters in an Ar-n2/He inductive plasma source with magnetic pole enhancement

Plasma Science and Technology 2017年第2期19卷 34-42页

作者： Maria YOUnUS n U REHMAn M SHAFIQ M nAEEM M ZAKA-UL-ISLAM M ZAKAULLAH Department of Physics Plasma Physics LaboratoryQuaid-i-Azam University45320 IslamabadPakistan Plasma Physics Laboratory Department of PhysicsCOMSATS Institute of Information Technology44000 IslamabadPakistan Department of Physics Faculty of ScienceJazan University114 JazanSaudi Arabia

Magnetic pole enhanced inductively coupled plasmas （MaPE-ICPs） are a promising source for plasma-based etching and have a wide range of material processing applications. In the present study Langmuir probe and optical emission spectroscopy were used to monitor the evolution of plasma parameters in a MaPE-ICP Ar-na/He mixture plasma. Electron density （ne） and temperature （Te）, excitation temperature （Texc）, plasma potential （Vp）, skin depth （6） and the evolution of the electron energy probability function （EEPF） are reported as a function of radiofrequency （RF） power, pressure and argon concentration in the mixture. It is observed that ne increases while Te decreases with increase in RF power and argon concentration in the mixture. The emission intensity of the argon line at 750.4 nm is also used to monitor the variation of the ‘high-energy tail＇ of the EEPF with RF power and gas pressure. The EEPF has a ‘bi-Maxwellian＇ distribution at low RF powers and higher pressure in a pure n2 discharge. However, it evolves into a ‘Maxwellian＇ distribution at RF powers greater than 70 W for pure n2, and at 50 W for higher argon concentrations in the mixture. The effect of argon concentration on the temperatures of two electron groups in the ‘bi-Maxwellian＇ EEPF is examined. The temperature of the low-energy electron group TL shows a decreasing trend with argon addition until the ‘thermalization＇ of the two temperatures occurs, while the temperature of high-energy electrons Ta decreases continuously.

关键词： MaPE-ICP Langmuir probe OES EEPF

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Conversion of an atomic to a molecular argon ion and low pressure argon relaxation

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Chinese Physics B 2016年第1期25卷 697-705页

作者： M n Stankov A P Jovanovie V Lj Markovic S n Stamenkovic Department of Physics Faculty of Sciences and MathematicsUniversity of Ni Viegradska 33Ni 18001Serbia

The dominant process in relaxation of DC glow discharge between two plane parallel electrodes in argon at pressure 200 Pa is analyzed by measuring the breakdown time delay and by analytical and numerical models. By using the approx- imate analytical model it is found that the relaxation in a range from 20 to 60 ms in afterglow is dominated by Ar＋ ions, produced by atomic-to-molecular conversion of Ar＋ ions in the first several milliseconds after the cessation of the discharge. This conversion is confirmed by the presence of double-Gaussian distribution for the formative time delay, as well as con- version maxima in a set of memory curves measured in different conditions. Finally, the numerical one-dimensional （1D） model for determining the number densities of dominant particles in stationary DC glow discharge and two-dimensional （2D） model for the relaxation are used to confirm the previous assumptions and to determine the corresponding collision and transport coefficients of dominant species and processes.

关键词： argon discharge afterglow relaxation fluid model plasma reactions

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Biomaterials and additive manufacturing:osteochondral scaffold innovation applied to osteoarthritis(BAMOS project)

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2018年第4期19卷 329-330页

作者： Mario MOnZón Departamento de Ingeniería Mecánica Universidad de Las Palmas de Gran CanariaEdificio de Fabricación Integrada

Osteoarthritis(OA)is a degenerative joint disease,typified by a loss of quality of cartilage and changes in bone at the interface of a joint,resulting in pain,stiffness,and reduced mobility."According to the World Hea... 详细信息

关键词：骨关节炎添加剂 ma 革新支架工程活动性疾病

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Effects of Welding Procedure on Corrosion Resistance and Hydrogen Embrittlement of Supermartensitic Stainless Steel Deposits

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Journal of Iron and Steel Research International 2013年第12期20卷 124-132页

作者： Zappa Sebastián Surian Estela Svoboda Hernán Research Secretariat Faculty of EngineeringNational University of Lomas de Zamora DEYTEMA-Development and Technology of Materials Centre Regional Faculty San NicolásNational Technological University Materials and Structures Laboratory INTECINFaculty of EngineeringNational University of Buenos Aires COnICET-national Scientific and Technical Research Council

The effects of shielding gas and post weld heat treatment on the pitting resistance, stress corrosion crack- ing and hydrogen embrittlement of supermartensitic stainless steel deposits were studied. Two all-weld-metal test coupons were prepared using a metal-cored wire under Ar＋ 5% He and Ar＋18%CO2 gas shielding mixtures. Solubi- lizing and solubilizing plus double tempering heat treatments were done with the objective of achieving different mi crostructural results, The samples welded under Ar＋5% He showed higher pitting corrosion resistance, for all post weld heat treatments, than those welded under Ar＋18% CO2. The different post weld heat treatments generated higher susceptibility to this corrosion mechanism. none of the samples presented signs of stress corrosion cracking, but in those subjected to the heat treatment, grain boundary selective attack was observed, on the surfaces of all the samples studied. The samples with highest hardness were more susceptible to hydrogen damage, thereby leading to reduced tensile strength on this condition.

关键词： supermartensitic stainless steel shielding gas post weld heat treatment corrosion hydrogen embrittle ment

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Rooting of Pinus radiata somatic embryos: factors involved in the success of the process

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Journal of Forestry Research 2019年第1期30卷 65-71页

作者： I.A.Montalbán P.Moncaleaán nEIKER-TECnALIA Centro de Arkaute

In vitro conditions of the culture media, plant growth regulators and culture containers may cause anatomical and physiological changes that have negative effects on rooting and ex vitro acclimatization of somatic plantlets. The control of these factors could contribute to the improvement of somatic embryogenesis systems in conifers, especially in pines. The influence of macronutrient concentrations, explant type and culture containers in Pinus radiata D. Don in vitro somatic embryo rooting were analyzed. The highest rooting percentage was observed using half-strength macronutrient concentrations, complete micronutrients and vitamins of Quoirin and Lepoivre medium. Although the use of glass culture vessels was the best to increase the efficiency of the somatic embryogenesis process in terms of rooting, the use of ventilated containers resulted in a significant increase in the percentage of plants able to be planted in the field.

关键词： Acclimatization Auxins Containers Pinus radiata Somatic embryogenesis

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Calculation of Electron Swarm Parameters of SF_6/n_2 in a Uniform Field Using an Improved Monte Carlo Collision Simulation Method

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Plasma Science and Technology 2008年第1期10卷 39-42页

作者：汪沨 W.PFEIFFER n.KOUZICHInE 邱毓昌 E.KUFFEL 李肯立 School of Electrical and Information Engineering Hunan University Changsha 410082. China Technische Universitt Darmstadt 64283 Darmstadt Germany School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Electrical Engineering and Computer Science University of Manitoba Winnipeg Canada School of Computor and Communication Huna University Changsha 410084 China

The electron swarm parameters of SF6/n2 are calculated in the present study using an improved Monte Carlo collision simulation method （MCS）. And some improved sampling techniques are also adopted. The simulation res... 详细信息

关键词： Monte Carlo collision simulation gas discharge swarm parameter

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Influence of thermomechanical processing on microstructure,mechanical and strain hardening properties of single-phase Mg-4Li-0.5Ca alloy for structural application

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Journal of Magnesium and Alloys 2020年第4期8卷 1262-1268页

作者： n.Sriraman S.Kumaran Sathiya narayanan n School of Mechanical Engineering SASTRA Deemed to be University ThirumalaisamudramThanjavurTamilnadu 613401India Department of Metallurgical and Materials Engineering National Institute of Technology TiruchirappalliTamil Nadu 620015India

The single-phase Mg-4Li-0.5Ca alloy was rolled at three different temperatures(250,300 and 350℃)and followed by annealing at 200°C for 10 *** evaluate the mechanical properties,the tensile test was conducted at a constant strain rate of 10^(-3)s^(-1).Factors influencing the tensile strength and strain hardening properties were assessed by microscopy,XRD and EBSD ***,Kocks-Mecking plots(K-M)were used to determine the different stages of strain hardening exhibited by the variously processed Mg-4Li-0.5Ca alloy test *** ultimate tensile strength has decreased as hot-rolling temperature in creases with increased *** strain hardening properties such as hardening capacity(Hc),strain hardening exponent(n)are increased significantly with an increase in hot rolling temperature and subsequent annealing.

关键词： Mg-4Li-0.5Ca Hot rolling Twins Mg2Ca Hardening capacity

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Energy distributions of multiple backscattered photons in materials

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nuclear Science and Techniques 2018年第2期29卷 68-73页

作者： Asuman Ayd?n Department of Physics Faculty of Arts and SciencesBal?kesir UniversityCagis Campus

Backscattering of gamma photons from a material is of fundamental importance in radiation shielding,industrial and medical applications, radiation dosimetry,and non-destructive testing. In Compton scattering, incident photons undergo multiple scatterings within the material(target) before exiting. Gamma photons continue to soften in energy as the number of scatterings increases in a thick target; in other words, the energy of gamma photons decreases as the scatterings increase in case of a thick target and results in the generation of singly and multiply scattered events. In this work, the energy distribution of backscattered gamma photons with backscattering intensity and energy probabilities were calculated by using the Monte Carlo method for metallic, biological, and shielding materials with various thicknesses of slab geometry. The materials under study were targeted with gamma photons of 0.279, 0.662, 1.250, and 2.100 Me V energies. In addition, the energy distributions of multiply scattered gamma photons were studied for materials with infinite *** results are presented and discussed in detail by comparing with other Monte Carlo calculations.

关键词： Monte Carlo simulation Gamma photon Backscattering energy distribution Backscattering probability Compton scattering

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Dust-cloud structures behind a shock wave moving over a deposited layer of fine particles

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Progress in natural Science:Materials International 2005年第11期15卷 972-981页

作者： A.n. OSIPTSOV 119899 Moscow Institute of Mechanics Moscow State University Russia

The present paper investigates dispersed-phase flow structures of a dust cloud induced by a normal shock wave moving at a constant speed over a flat surface deposited with fine particles. In the shock-fitted coordinates, the general equations of dusty-gas boundary layer flows are formulated within the framework of a multi-fluid model and parametnc numerical studies of the carrier- and dispersed-phase flow fields are performed. The problem associated with crossing particle trajectories and the formation of local particle accumulation regions are solved by using the full Lagrangian method for the dispersed phase. The basic features of the near-wall two-phase flow under consideration including the role of Saffman force in the particle entrainment and the development of discontinuities or singularities in the particle density profiles are discussed. The effects associated with account of the non-uniformity of particle size and the finiteness of the particle Knudsen numbers are studied in detail.

关键词： dust cloud moving shock wave particle entrainment Knudsen effect poly-disperse particles full Lagranglan method.

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Calculations of the transmitted gamma photons through infinite slabs

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nuclear Science and Techniques 2018年第4期29卷 114-120页

作者： Asuman Ayd?n Department of Physics Faculty of Arts and SciencesBal?kesir University Cagis Campus

The intensity and number of transmitted multiple scattered photons are calculated for 0.123, 0.320, 0.511,0.662, and 1.115 Me V gamma photons normally incident on slabs of carbon, aluminum, iron, copper, water, muscle,bone, and concrete with thicknesses varying from 1 to 10 mean free paths. The dependence of the transmission probability and energy distribution on the incident energy and material are examined. In general, the obtained results show good agreement with the other values calculated by the Monte Carlo method.

关键词： Monte Carlo simulation Gamma photons Energy distribution Transmission probability

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