Gas tungsten arc welding (GTAW) or Tungsten inert gas welding (TIG) is one of the widely used techniques for joining ferrous and non-ferrous metal.Gas tungsten arc welding process,consist of non-consumable tungsten electrode which is used to provide the arc for welding. During the welding cycle a shield of inert gas expels the air from the welding area and prevents oxidation of the electrode, w...

Practical application of hydrogen production from water splitting relies strongly on the development of low-cost and high-performance electrocatalysts for hydrogen evolution reaction (HER). The previous researches mainly focused on transition metal nitrides as HER catalysts due to their electrical conductivity and corrosion stability under acidic electrolyte, while tungsten nitrides have report...

Here, we report that the postsynthesis nitridation of tungsten oxide nanowires can result in single crystal nitride nanowires when the initial diameters of the nanowires are less than 10 nm. For nanowires with diameters greater than 10 nm, the nitridation of nanowires resulted in polycrystalline but highly oriented tungsten nitride domains in nanowires. Partially nitrided nanowires show an epit...

A Microsoft Excel macro is described that enables rapid recognition of common opaque minerals. The program uses ore mineralogical features such as reflectance, anisotropy, bireflectance, Vickers Hardness and morphological features (bladed crystals, zoning and twinning) to identify possible candidates from a database of 200 common ore minerals. Reflectance can be estimated from the uncorrected l...

This study investigated the effect of oxygen and micro-cracking on the flotation of low grade nickel sulphide ore. The ore treated contained serpentine minerals which have a history of being difficult to process efficiently. The use of oxygen as a bubbling gas has been noted to be effective because it increases the pulp potential. The desired effect of micro cracking the ore is that the nickel ...

A number of speech errors ore examined which ore difficult to account for by top-down serial processing models of speech production which hove independent levels of processing. In porticulor, most of these errors ore characterized by the presence of on interfering element which is external to the utterance under current construction. This paper has two main aims: to classify these errors, and t...

Simulation technique has been used for a feasibility study of a prospecting project for deep seated ore bodies. The simulation model is divided into three main parts; 1) The bedrock model the mathematical model of the geology in the investigated block.. 2) The ore model the mathematical model of the "economical" targets within the investigated block. 3) The drilling model the mathematical descr...

There has been much work in exploiting the potential field relationships to extract information from the data. Kanasewich and Agarwal in 1970 explored the validity of examining the magnetization to density ratio in the wavenumber domain as an interpretation tool. Directly combining magnetic and gravity derived gravity gradient data in the spatial domain through the Poisson relation has been acc...

Truncated Gaussian Simulation (TGS) is a well-known method to generate realizations of the ore domains located in a spatial sequence. In geostatistical framework geological domains are normally utilized for stationary assumption. The ability to measure the uncertainty in the exact locations of the boundaries among different geological units is a common challenge for practitioners. As a simple a...

Tungsten (atomic number 74) and the chemically analogous and very similar metal molybdenum (atomic number 42) are minor yet equally abundant elements on this planet. The essential role of molybdenum in biology has been known for decades and molybdoenzymes are ubiquitous. Yet, it is only recently that a biological role for tungsten has been established in prokaryotes, although not as yet in euka...