Results 231 to 240 of about 363,556 (256)
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25 The Surface Activity of Metalloids and Elemental Semiconductors
1957A previous exploratory study of the activity of evaporated films of the metals in gas chemisorption has now been complemented by a similar study of the metalloids (As, Sb, and Bi) and of the elemental semiconductors Se and Te. These elements prove to have lower activity than the metals, while As, Sb, and Bi are rather more active than Se and Te.
E. Greenhalgh, B.M.W Trapnell
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Comparing the surface activities of compounds using an elemental adsorbate
Journal of Physics D: Applied Physics, 1997It has been proposed that the interaction of a substrate with a suitable elemental adsorbate can be used to monitor its surface chemical activity. If the extent of adsorbate - substrate interaction can be measured by a surface chemical probe such as x-ray photoelectron spectroscopy, one could compare the surface activities of a variety of solids by ...
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Modeling of the effects of surface-active elements on flow patterns and weld penetration
Metallurgical and Materials Transactions B, 2001A mathematical model was developed to calculate the transient temperature and velocity distributions in a stationary gas tungsten arc (GTA) weld pool of 304 stainless steels with different sulfur concentrations. A parametric study showed that, depending upon the sulfur concentration, one, two, or three vortexes may be found in the weld pool.
Y. Wang, Q. Shi, H. L. Tsai
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The study of surface active element on weld pool development in A-TIG welding
Modelling and Simulation in Materials Science and Engineering, 2006A 3D mathematical model was developed to simulate the weld pool development in a moving A-TIG weld pool with different oxygen and sulfur concentrations. It is shown that the surface active elements—oxygen and sulfur, which change the temperature coefficient of surface tension from a negative value to a positive one, can cause significant changes in ...
Yuzhen Zhao, Heping Zhou, Yaowu Shi
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The study of surface-active element oxygen on flow patterns and penetration in A-TIG welding
Metallurgical and Materials Transactions B, 2006A three-dimensional mathematical model was developed to simulate the flow patterns and temperature distributions in a moving A-TIG weld pool of 304 stainless steels with different oxygen content using PHOENICS software. It is shown that the surface-active element, oxygen, is important, because it affects the weld shape by changing the flow patterns in ...
Yuzhen Zhao, Yaowu Shi, Yongping Lei
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Applied Surface Science, 2017
Abstract The present work has been focused on the effects of surface-active element sulfur on welding properties during 10 kW high power laser welding of 304 stainless steel thick plate. Molten pool behavior, morphology feature of sulfide inclusions, metallographic structures, XRD patterns, microhardness, potentiodynamic polarization curves and ...
Shichun Li +3 more
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Abstract The present work has been focused on the effects of surface-active element sulfur on welding properties during 10 kW high power laser welding of 304 stainless steel thick plate. Molten pool behavior, morphology feature of sulfide inclusions, metallographic structures, XRD patterns, microhardness, potentiodynamic polarization curves and ...
Shichun Li +3 more
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Metallurgical and Materials Transactions B, 2001
This article presents a mathematical model simulating the effects of surface tension (Maragoni effect) on weld pool fluid flow and weld penetration in spot gas metal arc welding (GMAW). Filler droplets driven by gravity, electromagnetic force, and plasma arc drag force, carrying mass, thermal energy, and momentum, periodically impinge onto the weld ...
Y. Wang, H. L. Tsai
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This article presents a mathematical model simulating the effects of surface tension (Maragoni effect) on weld pool fluid flow and weld penetration in spot gas metal arc welding (GMAW). Filler droplets driven by gravity, electromagnetic force, and plasma arc drag force, carrying mass, thermal energy, and momentum, periodically impinge onto the weld ...
Y. Wang, H. L. Tsai
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Applied Catalysis B: Environmental, 2018
Abstract Cobalt doped CeO2 (Co-CeO2) prepared by a single-step hydrothermal method was used for Hg0 catalytic oxidation. The catalysts were characterized by scanning electron microscope, transmission electron microscope, X-ray diffraction, Raman spectroscopy, electron paramagnetic resonance, X-ray photoelectron spectroscopy, H2-temperature programmed
Weichun Yang +5 more
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Abstract Cobalt doped CeO2 (Co-CeO2) prepared by a single-step hydrothermal method was used for Hg0 catalytic oxidation. The catalysts were characterized by scanning electron microscope, transmission electron microscope, X-ray diffraction, Raman spectroscopy, electron paramagnetic resonance, X-ray photoelectron spectroscopy, H2-temperature programmed
Weichun Yang +5 more
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Journal of Environmental Science and Health . Part A: Environmental Science and Engineering, 1989
Abstract The changes in some metal components of water hyacinth by exposure to cadmium, nickel with or without surface‐active agents are determined. Metal contents of Cd, Ni, Al, Ca, Si, Mn in tops and roots were changed in relatively short time by treatment with Cd or Ni. The values of concentration factors are reduced in both tops and roots under the
S. Muramoto +3 more
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Abstract The changes in some metal components of water hyacinth by exposure to cadmium, nickel with or without surface‐active agents are determined. Metal contents of Cd, Ni, Al, Ca, Si, Mn in tops and roots were changed in relatively short time by treatment with Cd or Ni. The values of concentration factors are reduced in both tops and roots under the
S. Muramoto +3 more
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Metal Science and Heat Treatment, 2016
Computer and experimental studies of the effect of admixtures of Te and H2 surface-active elements (s.a.e.) on the kinetics of nucleation of crystallization centers and phase growth under accelerated crystallization of eutectic cast iron are performed. It is shown that under quenching cooling with decelerated diffusion processes the admixtures of s.a.e.
R. M. Belyakova +2 more
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Computer and experimental studies of the effect of admixtures of Te and H2 surface-active elements (s.a.e.) on the kinetics of nucleation of crystallization centers and phase growth under accelerated crystallization of eutectic cast iron are performed. It is shown that under quenching cooling with decelerated diffusion processes the admixtures of s.a.e.
R. M. Belyakova +2 more
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