نتایج جستجو برای: metal melting
تعداد نتایج: 222752 فیلتر نتایج به سال:
This study reports the physical characterization of a spin-labeled DNA complex designed by our lab. This DNA complex is to be used for future modeling studies on spin-spin interactions between the unpaired electrons of a spin-label and a metal center using Electron Paramagnetic Resonance (EPR). The model complex is composed of a synthetic, 19-base pair DNA duplex, which acts as the scaffold for...
Historically, metals are cut up and polished to see the structure and to infer how processing influences the evolution. We can now peer into a metal during processing without destroying it using proton radiography. Understanding the link between processing and structure is important because structure profoundly affects the properties of engineering materials. Synchrotron x-ray radiography has e...
This paper presents a control system for manual pulsed Gas Metal Arc Welding (GMAW). This system consists of a current controller, which makes it possible to shape the current during welding, and two important components, which are the key issues discussed in this paper. These components include an arc length controller and a metal transfer controller. The arc length controller is based on a no...
National Institute of Standards and Technology, Gaithersburg, MD 20899-0001 Blackbody sources with nearly unity emittance that are in equilibrium with a pure freezing metal such as gold, silver, or copper are used as primary standard sources in the International Temperature Scale of 1990 (ITS-90). Recently, a facility using radio-frequency induction heating for melting and filling the blackbody...
Selective Laser Melting is an efficient process for producing metal parts with minimal subtractive post-processing required. Analysis of the parameters controlling the part quality has been performed focussing on the energy intensity during processing and the effect of the particle size distribution on factors such as ultimate tensile strength and surface finish. It is shown that the controllin...
The lattice and molecular dynamics for the solid phases of the lowest melting-point metal, Li(NH3)4, are determined by incoherent inelastic neutron scattering. Measurements of internal molecular displacements and distortions of the Li(NH3)4 units have been modelled and assigned using density functional theory calculations for the solid and molecular system. Inelastic neutron scattering measurem...
Power input to the arc in gas metal arc welding controls both the metal transfer process and the base-plate heating process. It would be advantageous to decouple these processes. Methods to achieve this decoupling are discussed. Pulsed-power welding is widely used, but only decoupling can be achieved. More complete decoupling may be obtained by using independent power inputs to the system. Seve...
The joining of wires to various substrates (wires, plates, foils and semiconductor packages) is a ubiquitous process in the manufacture and modification of electrical and electronic devices. While spot welding is used extensively to attach lamp and vacuum tube filaments to base wires and foils, soldering is almost universally used to make chip to package and wire to substrate interconnections i...
Abstract Glass‐forming metal–organic frameworks (MOFs) have novel applications, but the origin of their peculiar melting behavior is unclear. Here, we report synchrotron X‐ray diffraction electron densities two zeolitic imidazolate (ZIFs), glass‐forming Zn‐ZIF‐zni and isostructural thermally decomposing Co‐ZIF‐zni. Electron density analysis shows that Zn−N bonds are more ionic than Co−N bonds, ...
As pyrometallurgical technologies to smelt nickel metal from the oxide ore, melting reduction process using an electric furnace (Elkem) and semi-melting a rotary kiln (Krupp-Renn) with saprolite ore as raw material have been established operated commercially. However, in future, it is expected that will be difficult because of decline grade necessary develop new adaptable lower processing ore.
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