Materials Literature
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Following completion of the casting process (vertical direct‐chill (VDC) or horizontal direct‐chill (HDC) casting), the cast product is removed from the immediate vicinity of the casting unit to an area where all of the actions required to prepare the product for delivery to a customer may be made. The processes invol…
This specification covers one width and one breaking strength of low modulus aramid tubular webbing.
This Aerospace Recommended Practice (ARP) describes the processing system and techniques for the surface preparation and priming of aluminum alloy parts for structural adhesive bonding to achieve optimum bondline durability, corrosion resistance, and manufacturing producibility.
Abstract The Swiss Gosgen nuclear power plant (NPP) has decided to use two different methods for the disposal of its spent fuel. (1) To reprocess some of its spent fuel in dedicated facilities. Some of the vitrified waste from the reprocessing plant will be shipped back to Switzerland using the new COGEMA Logistics, T…
In quantum spins systems, frustration and low-dimensionality generate quantum fluctuations and give rise to exotic quantum phases. This thesis studies a spin ladder model with frustrating couplings along the legs, motivated by experiments on cuprate BiCu2PO6. First, we present an original variational method to describ…
Lâmpadas de vapor de sodio de alta pressao sao um tipo de lâmpada de alta intensidade de descarga. Suas caracteristicas as tornam adequadas para uso em sistemas de iluminacao de ambientes externos e industriais. No entanto, essas lâmpadas sao dispositivos complexos, principalmente devido a seu comportamento de impedân…
Este trabalho visa o desenvolvimento de processos heterogeneos eficientes, ambientalmente limpos e seletivos para a transformacao catalitica de materia-prima de origem natural renovavel e disponivel nos oleos essenciais. A fim de se obter produtos de quimica fina de alto valor agregado e de interesse comercial, podend…
Glasses are solid materials characterized by their lack of long range order, that is, solids with a liquid-like structure. Besides the common silica-based glasses conventionally used in windows, glasses obtained with metallic elements can also be produced, the so-called metallic glasses (MGs). Metallic glasses can onl…
We demonstrate the optical absorption has been enhanced in the small molecule organic solar cells by employing trapezoid grating structure. The enhanced absorption is mainly attributed to both waveguide modes and surface plasmon modes, which has been simulated by using finite-difference time-domain method. The simulat…
Crystal structures and microstructural features, such as structural phase transitions, defect structures, chemical and structural inhomogeneities, are known to have profound effects on the physical properties of superconducting materials. Recently, a large amount of works on the structural properties of Fe-based high-…
Title: Stability of plasma polymers under various conditions. Author: Jindřich Matoušek Department/Institute: Department of Macromolecular Physics/Charles University in Prague Supervisor of the doctoral thesis: prof. RNDr. Hynek Biederman, DrSc., Department of Macromolecular Physics Abstract: The depositions of plasma…
Neste trabalho apresentamos a sintese de adutos de Michael obtidos pela reacao diastereosseletiva entre azalactonas e enonas, catalisada por um acido de Bronsted. A metodologia consistiu no emprego de um organocatalisador, no caso (+/-)ACS, que em apenas 7 mol% conduziu aos produtos de Michael em bons rendimentos (ate…
In present work we studied the processes of phase transition of five luminescent liquid-crystals by using emission ellipsometry technique. The samples studied present different mesophases liquid crystalline between the solid crystalline and liquid isotropic phases. The samples were characterized by optical absorption,…
This paper shows that the model of short, flexible Lennard-Jones chains (LJC) has curves (isomorphs) in its phase diagram along which structure and dynamics are invariant in the appropriate units. The isomorphs are identified by a density-dependent scaling exponent which can be obtained from fluctuations in the config…
SažetakCilj je ovog rada ispitati utjecaj kemijske obrade čađe anorganskim oksidirajućim kiselinama (H 2 SO 4 i HNO 3 ) na njezina površinska svojstva.Specifi čna površina, prosječni promjer pora i raspodjela veličina pora analizirani su metodama Brunauer-Emmett-Teller (BET) i Barrett-Joyner-Halenda (BJH).Mikroskopska…
The effects of temperature in TiAl coating anodization ..........
Cr-Mo steels are widely used in pipes and components constantly subjected to degradation processes in the petrochemical industries. The exposure of these steels in harsh environments for extended periods when subjected to elevated temperatures lead to microstructural changes, such as carbide precipitation which a ffec…
Boundaries provide necessary distinction. It lends shape, surface appearance, and point to substance. The most obvious kind of boundary and simplest perhaps to appreciate is that of a physical boundary. The boundary not only might be flexible, it also might be fluid, by which we mean permeable. The notion of boundary…
Innovative recent research has shown that gold in a highly dispersed state can exceptionally catalyze preferential CO oxidation (PROX) reaction and be effectively employed in fuel cell applications. Several factors control the activity and the selectivity of gold catalysts and can affect their efficiency in the title…
This chapter focuses on the chemical methods that are used for the preparation of gold‐based catalysts with the aim of forming small metal particles (<5 nm) stabilised on solid supports. The chapter mainly gathers the advances in gold catalyst preparation made since 2006, i.e. since the publication of the very first b…