... Title : Effect of Microarc Oxidation on the Corrosion and Mechanical Behavior of Cast Aluminum Alloys. Descriptive Note : Journal article,. ...

... Accession Number : ADD146233. Title : Microarc Oxidation of D16T Alloy With Alternating Current in an Alkali Electrolyte. ...

... a proprietary micro-arc oxidation process to ... Selected aluminum and titanium alloy test specimens ... measured for surface hardness, roughness, and ...

... FOR ALUMINUM AND TITANIUM ... 15. SUBJECT TERMS SBIR Report, Microarc coating, fretting wear, aluminum and titanium alloy 16. ...

... MAO coatings) under equal conditions but in different electrolytes: aqueous solution of water glass, of sodium hexametaphosphate, and of borax. ...

Black and gray microarc oxidation coatings have been obtained on 2A70 Aluminum alloy in phosphate electrolyte with and without titania sol, respectively. The growth process of the microarc oxidation coating in the electrolyte with titania sol was investigated. The coating was characterized by scanning electron ...

In order to improve the biocompatibility and surface activity of a TLM alloy, a layer of a porous TiO2 film was prepared by the micro-arc oxidation method on the surface, and then the NH?2 active group was introduced on the film by an activation treatment in an aminated solution. The phase identification and surface characteristics of the ...

General information about microarc oxidation (MAO) process and the influence of MAO on mechanical and corrosion-mechanical properties of titanium alloys was presented. The formation conditions, compositions, and physical-chemical characteristics of anticorrosion, antiscale, wear-resistant, and antiscuff coatings were discussed. The interconnection between ...

The coatings mainly composed of nanostructured TiO2 were deposited on Ti6Al4V alloy by microarc oxidation (MAO). The duplex coatings of microarc oxidation combined with spraying graphite process were fabricated for the antifriction purpose. The tribological properties of unpolished, polished and duplex coating ...

Oxide coatings were produced on AM60B magnesium alloy substrate making use of microarc oxidation (MAO) technique. The effect of KF addition in the Na2SiO3 KOH electrolytic solution on the microarc oxidation process and the structure, composition, and properties of the oxide ...

Micro-arc oxidation is a recently developed surface treatment technology under anodic oxidation. Through micro-arc oxidation, a ceramic coating is directly formed on the surface of magnesium alloy, by which its surface property is significantly improved. In this paper, a dense ceramic ...

Micro-arc oxidization of AZ91D magnesium alloys was studied in solutions containing sodium aluminate and potassium fluoride at constant applied current densities. The influence of applied current densities, concentration and constituents of the electrolyte as well as treatment time on micro-arc oxidization process ...

This report was developed under a SBIR contract, and has been released to the public by Infoscitex. Aluminum and titanium alloys are used as replacements for steel in gear boxes of aircraft and helicopters in both military and commercial air vehicles, due...

By micro-arc oxidation (MAO), the oxide coatings were prepared on the surface of magnesium alloys in a composite electrolytic solution. The microstructures of the coating layer and the interface between coating and substrate were analyzed by using transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The ...

Ceramic coatings have been successfully prepared on biocompatible AZ31 magnesium alloy substrates using microarc oxidation (MAO) technique. Residual stresses attributed to the MgO constituent of the coatings at different oxidation voltages have been evaluated by x-ray diffraction using the sin2 ? method. It is found that tensile ...

Ceramic coatings were fabricated on Ti6Al4V alloy surface by microarc oxidation (MAO) in Na2SiO3-(NaPO3)6-NaAlO2 solution using an AC power supply. Microstructure and phase composition of coating were characterized by SEM and XRD, respectively. The antifriction property of the coating with and without solid lubricant sliding against SAE 52100 steel ball ...

Micro-arc oxidation (MAO) is an effective approach to improve the properties of aluminum and its alloy by forming ceramic films on the surface. However, the oxide layers often have a porous surface structure, which exhibits relatively high friction coefficients. In this work, in order to enhance the surface and mechanical properties of ...

Micro-arc oxidation (MAO) is a novel technique for producing oxide films on metals like Al, Mg, Ti and Zr. A ceramic-like film containing Ca and P was deposited on Ti-6Al-4V substrate by MAO in an electrolytic solution using a pulsed power supply. XRD indicated that the film was a mixture of anatase, rutile and VO. SEM showed that the ...

Ceramic coatings were formed on Ti6Al4V alloy surface by microarc oxidation (MAO) in a Na2SiO3 system solution. Unlubricated, smear oil and oil bath lubricated fretting tests were performed on MAO coatings against 52100 steel on a fretting wear tester. Microstructural investigation of the worn surfaces was performed and the wear mechanisms were studied. ...

Micro-arc oxidation technique (MAO) treatment produces a layer of alumina film on the surface of the aluminum alloy. A hard and uniform tetrahedral amorphous carbon film (diamond-like carbon, DLC) was deposited on the top of the alumina layer of the 2024 aluminum alloy by a pulsed filtered catholic vacuum arc (FCVA) deposition system with a metal vapor ...

The thick ceramic coatings were prepared on 6061 aluminum alloys by microarc oxidation in a silicate electrolyte. The morphology and phase constituent of the coatings with different thickness were studied by scanning electron microscope, and X-ray diffraction. Scratch and thermal shock tests were employed to evaluate the adhesion between the coating and ...

Ceramic coatings were formed on a pure aluminum substrate in an aqueous solution of phosphate salt, using the pulsating micro-arc oxidation method. XRD indicated that the film composed of pure ?-Al2O3. SEM showed that the surface of the film was micro-porous with 1-5 ?m pores. EDS gave the element distributions of the cross-section. The result indicated ...

The effects of the electrical bias conditions on oxide film during titanium MAO (microarc oxidation) were investigated. Since DC voltage showed very low stabilized currents but produced oxide films with poor quality, the magnitude of applied voltages, duty cycles, and frequencies were modulated to control the ...

Thick ceramic films over 140 ?m were prepared on Al 7% Si alloy by ac microarc oxidation in a silicate electrolyte. The film growth kinetics was determined by an eddy current technique and film growth features in different stages were discussed. The microstructure and composition profiles for different thick films were analyzed by scanning electron ...

In this paper, the applications and qualifications of biomedical materials are introduced. In regard to the hard tissue implants, the biocompatibility can be improved by preparing various bio-ceramic and bio-glass coatings. In view of this, the principles, characteristics, and applications of surface modification (plasma spraying, electrostatic spray deposition, micro-arc ...

A novel coating technique of thin ceramic layer resembling teeth color on titanium (Ti) surface was developed by combination of sputter deposition of metal zirconium (Zr) and subsequent micro-arc oxidation (MAO) treatment. The oxide layer grown by MAO treatment had a porous structure with a thickness of approximately 6 micrometers and ...

A porous hydroxylapatite-containing titania film was prepared by an electrochemical oxidation method, i.e. micro-arc oxidation (MAO). During the oxidation treatment, the titanium sample was immersed in electrolytic solution containing calcium acetate monohydrate and sodium biphosphate dihydrate by using a pulse ...

Surface properties and corrosion resistance analyses of Ti-13Nb-13Zr coated by an oxide film (obtained by micro-arc oxidation at 300�V) or an oxide/hydroxyapatite (HA) film are reported. HA films were biomimetically or electrochemically deposited on the alloy/oxide surface, and their ...

The use of a microarc atomizer as a device for microsample introduction into the ICP(Inductively Coupled Plasma) is described. The microarc, a high-voltage, low-current, pulsating dc discharge, efficiently vaporizes desolvated, discrete microvolumes of sa...

Hydroxyapatite-containing titania coatings on titanium substrates were formed by micro-arc oxidation (MAO) in electrolyte containing calcium acetate monohydrate (CH{sub 3}COO){sub 2}Ca.H{sub 2}O) and sodium phosphate monobasic dihydrate (NaH{sub 2}PO{sub 4}.2H{sub 2}O) using a pulse power supply. Scanning electron microscopy (SEM) with Energy dispersive ...

Micro-arc oxidation (MAO) of AZ31B magnesium alloys was studied in alkaline silicate solutions at constant applied current densities. The microstructure, phase composition and elemental distribution of ceramic coatings were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy-dispersive spectroscopy (EDX). There are two ...

Microarc oxidation (MAO) is a surface treatment that provides nanoporous pits, and thick oxide layers, and incorporates calcium and phosphorus into the coating layer of titanium alloy. We presumed such modification on the surface of titanium alloy by MAO would improve the ability of cementless stems to osseointegrate. We therefore ...

Microarc oxidation (MAO) is a surface treatment that provides nanoporous pits, and thick oxide layers, and incorporates calcium and phosphorus into the coating layer of titanium alloy. We presumed such modification on the surface of titanium alloy by MAO would improve the ability of cementless stems to osseointegrate. We therefore ...

... Accession Number : ADD815090. Title : Micro-Arc Alternative to Laser Welding. Descriptive Note : Journal article. Corporate Author : ...

... during sample atomization from a 'microarc' discharge have been studied photometrically, by use of high-speed color cinematography and through ...

This study is intended to evaluate the effects of microarc oxidation (MAO) on the biocompatibility of near beta titanium alloy Ti-5Zr-3Sn-5Mo-15Nb (TLM) in vitro. Two porous bioactive surfaces with different surface characteristics were grown on TLM substrates via MAO process at two different final voltages. Both calcium and phosphorus were incorporated ...

V2O5-TiO2 porous layers with a pore size of 50-400 nm were synthesized via a micro-arc oxidation process under different applied voltages. Morphological and topographical studies, performed by SEM and AFM techniques, revealed a nanoporous morphology with a rough surface where the pores' size as well as the surface roughness increased with voltage. In ...

Ultra-hard ceramic coatings with microhardness of 2535 Hv have been synthesized on the Al alloy substrate by microarc oxidation (MAO) technique. The effects of anodic current density (ja) and the ratio of cathodic to anodic current density (jc/ja) on the mechanical and corrosion resistance properties of MAO coatings have been studied by microhardness and ...

Ceramic-like coatings were deposited on the substrate of the AZ91 alloy by micro-arc oxidation (MAO). Many methods like X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron diffraction spectroscopy (EDS) were used to analyze the structure and composition of the coating. XRD showed that the MAO coating was mainly composed of MgO. The ...

Ti-24Nb-4Zr-7.9Sn (TNZS) is a newly developed beta-titanium alloy with low modulus and it has been considered as good material for dental or orthopedic implant. The purpose of the current study is to evaluate the effect of micro-arc oxidation (MAO) treatment on the biological performance of TNZS surface. The phases, morphology and chemical composition of ...

The objective of this article is to evaluate the influence of microarc oxidation (MAO) coatings on the high-cycle rotating bending fatigue behavior of the 6061-T6 aluminum alloy. Toward this purpose, the influence of the MAO coating process parameter (current density) and coating thickness on the fatigue life of the 6061-T6 Al alloy has been evaluated in ...

Ceramic coatings have been synthesized on 6063 aluminum alloy by micro-arc oxidation (MAO) technique. The effects of current intensity on the chemical and mechanical properties of MAO coatings have been studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), micro-hardness test, adhesion measurement, and friction and wear tests. The ...

We report experimental results for time dependent plasma properties during microarcing in a rf plasma system. A cutoff discriminator bias voltage can be defined as a parameter representing plasma potential. The cutoff voltage during the microarcing does not exactly follow the dependence of floating potential. The plasma/ion density increases significantly ...

Micro-arc oxidation (MAO) is an anodizing technique applied to valve metals. With MAO, a crystalline aluminum oxide layer can be grown on aluminum alloys. This paper examines MAO as a surface treatment for metals for vacuum use. A 17.6 ?m-thick MAO layer was grown on an A5052 aluminum alloy surface employing 50 Hz AC and a maximum of ...

To increase the specific surface area of a TiO2 layer synthesized by micro-arc oxidation (MAO), an alkali etching process was developed to form a nanoflaky structure in place of the existing microporous morphology of the MAO-TiO2 layer for dye-sensitized solar cell (DSSC) electrode application. An annealing treatment was also carried out to enhance the ...

Silicon-incorporated TiO(2) coating (Si-TiO(2) ) was prepared on titanium (Ti) by micro-arc oxidation (MAO) technique in the Ca, P, Si-containing electrolyte. The surface topography, phase, and element composition of the coatings were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy-dispersive X-ray spectrometry ...

Novel photocatalytic coatings containing strontium hydroxyapatite (SrHA), strontium titanate (SrTiO(3)), and TiO(2) were formed by micro-arc oxidation (MAO) in an aqueous electrolyte containing strontium acetate and ?-glycerophosphate disodium at 530�V for 0.1-5�min. The structure evolution of the coatings was investigated as a function of processing ...

Chemical manipulations of the implant surface produce a bactericidal feature to prevent infections around dental implants. Despite the successful use of bismuth against mucosal and dermis infections, the antibacterial effect of bismuth in the oral cavity remains under investigation. The aim of this study was to evaluate the antibacterial activities of bismuth compounds against Actinobacillus ...

Bioactive ceramic coatings on titanium substrates were prepared successfully by micro-arc oxidation coupled with electrophoretic deposition (MAO and EPD) in NaOH electrolyte solution containing hydroxyapatite (HA) particles. The HA suspensions with various NaOH concentrations were prepared by ultrasonic dispersion. The microstructure, as well as the ...

Photocatalysis is a reaction that happens on the surface of catalysts around only several atomic layers. Therefore, the microstructure beneath the surface plays a key role for the improvement of photocatalytic property. In this paper, the microstructural variation of the TiO(2) film from micro-arc oxidation (MAO) was characterized by using a high ...

The Mg-Ca alloy system has been proposed as a potential new kind of degradable biomaterial with possible application within bone. Here microarc oxidation (MAO) coatings were fabricated on top of a Mg-Ca alloy using different applied voltages and the effect of applied voltage on the surface morphology and phase constitution, hydrogen evolution, pH variation ...

Zirconia films containing Ca and P were prepared by micro-arc oxidation (MAO) of zirconium. The microstructure, in vitro bioactivity, and primary osteoblast response of the films were investigated as a function of the applied voltages in the range of 400-500 V. The results indicate that the MAO-formed zirconia films are porous and nanocrystalline, and ...

Plasma electrolytic oxidation (PEO) has attracted widespread attention owing to the simplicity of operation and the excellent properties of the formed coating. However, wider applications of PEO have been limited due to the high power consumption. This work describes the design and performance of a novel technique named shorter distance PEO (SD-PEO), which is intended for ...

Plasma electrolytic oxidation (PEO) has attracted widespread attention owing to the simplicity of operation and the excellent properties of the formed coating. However, wider applications of PEO have been limited due to the high power consumption. This work describes the design and performance of a novel technique named shorter distance PEO (SD-PEO), which is intended for ...

Details of the processes occurring during sample atomization from a 'microarc' discharge have been studied photometrically, by use of high-speed color cinematography and through current-voltage waveforms. The 'microarc' studied here is an atmospheric pressure inert gas glow discharge supported between 0.25 mm diameter tungsten wires; quiescent argon-1% H2 ...

... a high-voltage, low-current, pulsating dc discharge, efficiently vaporizes desolvated, discrete microvolumes of sample solution into the plasma. ...

... Peter ; Slabinski, Victor ; Tracey, Jeffrey ; Wooden, William. ... The quality has improved as well, with current ... micro-arc seconds (ultra, 24-h predict). ...

Interlinked ribbon-like TiO2 films were prepared by micro-arc oxidation (MAO) process and subsequent chemical-treatment of titanium substrate. The chemical-treatment included two steps: firstly, alkali treatment was performed on the surface of the porous TiO2 films, and then the samples were ion-exchanged in acid aqueous solution. The phase and ...

Magnesium alloys may potentially be applied as biodegradable metallic materials in cardiovascular stent. However, the high corrosion rate hinders its clinical application. In this study, a new approach was adopted to control the corrosion rate by fabricating a biocompatible micro-arc oxidation/poly-L-lactic acid (MAO/PLLA) composite coating on the ...

Recently, biodegradable magnesium alloys have been introduced in the field of cardiovascular stents to avoid the specific drawbacks of permanent metallic implants. However, the major obstacle of the clinical use of magnesium-based materials is their rapid corrosion rate. In this paper, a composite micro-arc oxidation/poly-L: -lactic acid (MAO/PLLA) coating ...

Aim: To investigate the effect of calcium concentration on the bone tissue response to Ca-incorporated titanium implants Materials and methods: Two titanium surfaces containing 4.2% and 6.6% calcium were prepared using the micro-arc oxidation process. The implants were inserted in the tibia of nine New Zealand White rabbits. After 6 weeks of healing, the ...

... observed with the Ladish D6AC, Type 300M, and Vascojet 1000 alloy steels in the ... 3 Mechanical Properties of Ladish D6AC Test Specimens 4 ...

... Abstract : Results of environmental bent-beam stress-corrosion tests for specimens of Ladish D6AC, Type 300 M and Vascojet 1000 alloy steels ...

... Significant failures were observed with the Ladish D6AC, Type 300M, and Vascojet 1000 alloy steels in the environments of distilled water, tap ...

... Abstract : Results are tabulated for bent-beam stresscorrosion tests on specimens of Ladish D6AC, Type 300M, and Vascojet 1000 alloy steels ...

A microwave induced, atmospheric pressure active nitrogen plasma has been investigated as an atom reservoir for laser induced ionization spectrometry. Discrete analytical samples were introduced into the active nitrogen plasma by a microarc atomizer. Both...

Chemical treatment was used to modify the surface of microarc oxidized (MAO) coating containing Ca and P. And the chemically treated MAO (C-MAO) coating was further heat-treated at 400-800 degrees C. The average roughness of the MAO and C-MAO coatings is about 250 nm; further heat treatment improved the roughness of the C-MAO coating. The chemical and heat ...

Oxide coating layers were formed on a pure magnesium (Mg) substrate through anodization and micro-arc oxidation (MAO) in order to enhance the biocompatibility and reduce the degradation rate. A thin, smooth MgO coating layer was formed after the anodization. On the other hand, when the Mg was treated using the MAO process, a relatively ...

Cardiovascular magnesium-based stents have been already applied in patients. However, their high corrosion rate hinders their clinical application. In this study, we adopt a new approach in the design of a Mg-based stent to improve the biodegradation rate and the drug release rate. By fabricating a micro-arc oxidation/poly-l-lactic acid (MAO/PLLA) ...

The purpose of this study is to investigate the biocompatibility and osteoconduction of active porous calcium-phosphate films on the novel Ti-3Zr-2Sn-3Mo-25Nb biomedical alloy. The active porous calcium-phosphate films were prepared by the micro-arc oxidation method on the surface of a near ? biomedical Ti-3Zr-2Sn-3Mo-25Nb alloy, and then activated in a ...

Objective: Recent studies have suggested that magnesium (Mg) ions exert a beneficial effect on implant osseointegration. This study assessed the osseointegration of nanoporous titanium (Ti) surface incorporating the Mg produced by hydrothermal treatment in rabbit cancellous bone to determine whether this surface would further enhance bone healing of moderately rough-surfaced implants in cancellous ...

Considering the role of von Willebrand factor (vWf) in hemostasis, and the role of oxidative stress in the development of endothelial dysfunction and atherosclerotic disease, the aim of our study was to investigate the relationship between vWf, parameters of oxidative stress and different types of acute coronary syndromes (ACS). Levels of vWf activity ...

Industrial wastewater sludge was treated by microwave processes to enhance the stabilization of laden copper. The effects of additives, processing time, microwave adsorbents, moisture content, reaction atmosphere, and cooling gas were investigated. The stabilization results were significantly enhanced by metal powder additives, prolonged microwave processing time, proper moisture content, the ...

Zirconium and its alloys are thought to be ideal materials for dental and orthopedic implants. However, the surface of native zirconium is bio-inert. It has been reported that micro-arc oxidation (MAO) is a convenient and effective method to improving the biocompatibility and bioactivity of the zirconium surface, and ultraviolet (UV) irradiation can ...

High corrosion rate and accumulation of hydrogen gas upon degradation impede magnesium alloys' clinical application as implants. In this work, micro-arc oxidation (MAO) was used to fabricate a porous coating on magnesium alloys as an intermediate layer to enhance the bonding strength of propolis layer. Then the composite coatings were fabricated using ...

Microarc oxidation (MAO) was considered to be one of the most effective surface coating techniques to improve the osseointegration of the implants. However, the influences of such coating on the skin epithelium interface still gained less attention in present literatures. Clinical data showed that 15-20% of patients might have an infection following ...

We report here, for the first time, a novel multi-scaled hybrid orthopedic implant material consisting of a macroporous Ti scaffold, whose macropores' walls have a microporous titania layer which is fully covered with nanofibers of Sr-doped hydroxyapatite (Sr-HA). The microporous titania layer is formed on and within the Ti scaffold by micro-arc oxidation, ...

We report here, for the first time, a novel multi-scaled hybrid orthopedic implant material consisting of a macroporous Ti scaffold, whose macropores' walls have a microporous titania layer which is fully covered with nanofibers of Sr-doped hydroxyapatite (Sr-HA). The microporous titania layer is formed on and within the Ti scaffold by micro-arc oxidation, ...

... Two types of data files are described in this appendix. ... fields 1 through 13; (1) session, (2) channel, (3) ACID, (4) user-type, (5) AC-type, (6) beacon ...

... to 75% of the 0.2% offset yield strength, of Ladish D6AC, Type 300M, and Svascojet 1000 alloy steels, AM 355 and PH 15-IMo stainless steels. ...

... Specimens of Ladish D6AC, Type 300M, and Vascojet 1000 alloy steels, AM355 and PH 15-7 Mo stainless steels, and B120VCA Ti alloy are being ...

... Abstract : Bent-beam stress-corrosion test data are presented for specimens of Ladish D6AC, Type 300M, and Vasco-jet 1000 alloy steels, AM355 ...

In the final report of the effort determine the validity of carbon equivalent formulae to predict weldability of low carbon microalloyed steels, the HAZ of a range of steels was characterized (HSLA 80-130, HY 130, DQ and AC types) and the formula of Yurio...

Objective: The study was designed to evaluate the comparative effect of osseointegration induced by the dental implants of Beijing Leiden Biomaterial (BLB) and BLBIII. Materials and methods: The surface properties ofBLBI and BLBIII were studied through thermal field-scanning electron microscopy, energy-dispersive X-ray spectroscopy (EDS) and optical profilometer. A total of 36 BLBI and BLBIII ...

Corrosion behaviour of biomedical alloys is generally determined in mineral electrolytes: unbuffered NaCl 0.9% (pH 7.4) or artificial saliva (pH 6.8). The assays with exclusive utilization of these electrolytes are of low relevance for the biological condition, to which the alloys will be exposed once implanted in the human organism. As an approach to the biological situation regarding the ...

Several cell types, including cardiac myocytes and vascular endothelial cells, produce nitric oxide (NO) via both constitutive and inducible isoforms of NO synthase. NO attenuates cardiac contractility and contributes to contractile dysfunction in heart failure, although the precise molecular mechanisms for these effects are poorly defined. Adenylyl cyclase (AC) isoforms type ...

We discuss the determination of diurnal and semidiurnal variations in the rotation rate and the direction of rotation axis of Earth from the analysis of 8 years of very long baseline interferometry (VLBI) data. This analysis clearly show that these variations are largely periodic and tidally driven; that is, the periods of the variations correspond to the periods of the largest lunar and solar ...

The prime science goal of the RadioAstron project (Space VLBI at 0.3, 1.6, 5 and 22 GHz) is observation of ultra-high brightness temperature regions near massive black holes. The RadioAstron project is the only planned Space Science mission which will achieve Micro-Arc Second resolution. At this high angular resolution, the general relativistic effects due to warped space-time ...

DoublyFed Induction Generator (variable speed) Plant Feeders ac dc partial power dc ac Type 4 10 generator full power ac to dc dc to ac Fullconverter interface #12;2. What is a wind plant? Type 3 Doubly Fed/3 of full power rating � Eliminates wind gustinduced power spikes � More efficient over wide wind speed

An investigation was undertaken to develop a method for attaching Pt-Ft- l0Rh thermocouples by resistance welding to thin 80 Ni-20 Cr clad fuel sheet and produce metallurgically sound joints or nuggets. Data and microstructures are shown to illustrate that the a-c type resistance welder is capable of producing metallurgically sound welds consistently and without surface damage to the fuel ...

One-dimensional hybrid particle-in-cell simulations in cylindrical r coordinate, with particle ions and Boltzmann's distribution of electrons, are used to investigate the arcing effect in radio-frequency (rf) capacitively coupled discharged plasma. The simulation shows that the arcing at the chamber wall is enhanced by the nonvanishing ion sheath at the surface, such that the emission ...

One-dimensional hybrid particle-in-cell simulations in cylindrical r coordinate, with particle ions and Boltzmann's distribution of electrons, are used to investigate the arcing effect in radio-frequency (rf) capacitively coupled discharged plasma. The simulation shows that the arcing at the chamber wall is enhanced by the nonvanishing ion sheath at the surface, such that the emission electrons ...

The effect of a narrow-band isotropic stochastic gravitational wave background on pulsar timing and astrometric measurements is studied. Such a background appears in some theories of gravity. We show that the existing millisecond pulsar timing accuracy (approximately 0.2 micros) strongly constrains possible observational consequences of theory of massive gravity with spontaneous Lorentz braking, ...