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Full-Text Articles in Engineering
Nanomechanical And Scaling Behavior Of Nanoporous Gold, Nicolas J. Briot
Nanomechanical And Scaling Behavior Of Nanoporous Gold, Nicolas J. Briot
Theses and Dissertations--Chemical and Materials Engineering
Nanoporous metals have recently been drawn significant interest in various fields of research. Their high surface-to-volume ratio present a strong potential for applications in sensing, catalysis, micro-electromechanical systems (MEMS) and even in the medical field. However, the mechanical properties of nanoporous metals have not yet been well determined, as conducting mechanical tests was found to be challenging. Scaling relations linking the mechanical properties of porous materials to those of their dense counterparts are successfully and widely used for many porous metals. However, their applicability to nanoporous metals have recently been questioned, as estimations from the classic scaling relations were found …
Sustainable Disposal Of Coal Processing Waste Streams, Mohammad Rezaee
Sustainable Disposal Of Coal Processing Waste Streams, Mohammad Rezaee
Theses and Dissertations--Mining Engineering
Modern coal preparation facilities incorporate a wide array of solid-solid and solid-liquid separation processes for rejecting mineral matter to meet market specifications. The coarse mineral matter is typically placed into engineered refuse piles whereas the fine refuse is either stored in impoundments or co-disposed with the coarse refuse. The discharge water from the refuse material represents an environmental concern due to the potential release of trace elements, and the subsequent elevation of total dissolved solids and conductivity. The research findings reported in this dissertation addresses sustainable coal processing waste disposal through using strategies aimed at minimizing the environmental impacts. To …
Engineered Surface Properties Of Porous Tungsten From Cryogenic Machining, Julius M. Schoop
Engineered Surface Properties Of Porous Tungsten From Cryogenic Machining, Julius M. Schoop
Theses and Dissertations--Chemical and Materials Engineering
Porous tungsten is used to manufacture dispenser cathodes due to it refractory properties. Surface porosity is critical to functional performance of dispenser cathodes because it allows for an impregnated ceramic compound to migrate to the emitting surface, lowering its work function. Likewise, surface roughness is important because it is necessary to ensure uniform wetting of the molten impregnate during high temperature service. Current industry practice to achieve surface roughness and surface porosity requirements involves the use of a plastic infiltrant during machining. After machining, the infiltrant is baked and the cathode pellet is impregnated. In this context, cryogenic machining is …