Materials Literature
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Zooplankton community structure in the standing water bodies could be affected by various ecological factors, includingwater chemistry, Lake typology and human activity in the watersheds. Examination of the zooplankton assemblages of thevulnerable to the human impacts freshwater bodies was conducted during the period…
The nanodiamonds (ND) are product of nanotechnology, with potential to be used in the biotechnologies as well as inecobiotechnologies. In the present work, the effect of ND on the technological parameters of azo-detoxification process hasbeen studied. The model wastewater treatment process in two sand lab scale biofil…
New information on the distribution of some macrophytes from different types of limnetic water bodies in Bulgaria waspresented. The chorological data are related to 9 species: Ceratophyllum demersum, Lemna gibba, Myriophyllum spicatum,Myriophyllum verticilatum, Najas marina, Potamogeton gramineus, Potamogeton pectinat…
In this article the influence of micro-alloying with yttrium upon dispersion of solid and increasing of corrosion resistance of 06Х23Н18М5 steel was investigated
Investigated were changes in metal oxidation in an open hearth furnace for various steel grades melting analyzed were the factors ,influencing the value of oxygen activity inside the steel smelting unit, prior to metal transfer into a ladle
The structural state of Е36 steel was investigated after heat-treatment regime which includes isothermal holding at the subcritical temperatures and subsequent normalization. It is shown the absence of the ferrite-pearlite bands and refinement of the steel microstructure after the proposed regime in respect to the sta…
The influence of plate thickness normalized steels S355NL, alloyed with niobium, and niobium and vanadium on the mechanical properties was investigated. It was found that with the increase of plate thickness from 20 to 120 mm the level of mechanical properties of continuously decreased. The introduction of vanadium in…
碩士論文 指導教授-彭珮雯 委員-許維君 委員-歐耿良
The investigation of mechanical properties of pipe steel (breaking point, relative elongation, impact strength at 20°С and –40°С), which melted in the semi-industrial conditions and modified with yttrium
Recommendations were made for optimisation of heat treatment of rails and chemical combination of rail steel directed on decrease of the rejection because of low contraction ratio. The objective is reached by raising of self-tempering temperature, decrease of hardening temperature, increase in velocity of the rail mov…
The influence of substantial surface overheating of rails upon the formation of large austenite grain was s shown in the article, leading to insufficient yield strength. Also investigated was the influence of heating rate upon yield strength. Raising the temperature of heating speed from 900 to 1040oС enlarges austeni…
Influence of the preliminary rolling temperature during thermo-mechanical processing of the X70 steel was investigated on its yield stress, ferrite grain size and fracture mechanism. It is shown a decrease of the yield stress with the temperature rise which is accompanied by decreasing the grain size and changing the…
碩士論文 指導教授-彭珮雯 委員-黃瓊芳 委員-張祝芬
It is experimentally found out that among the existing methods of mechanical treatment fine sharpening with diamond tool, diamond polishing and abrasive treatment methods are most efficient from the point of view of formation light reflecting surfaces of parts, made of aluminum alloys. These methods ensure the lowest…
The method of study of thermo-diffusion of elements in the massive cast-iron samples was developed. It was shown that properties of cast-iron after thermo-cycling depended on electrical negativity of the material, contacting with hot butt end of solid metal
The experimental work to identify the degree of dependence of extraction of sulfur from the cast iron as if it were vacuumization, and in furnace desulfurization. Our studies provide an opportunity to resolve the controversy over the impact of the duration of vacuumization, pressure, diffusion in the boundary layer of…
Influencing of electromagnetic treatment of water, entering in the composition of green molding sand on strengths properties was investigated. The modes of treatments, providing increase of tensile strength on a compression in two times were offered
碩士論文 指導教授-彭珮雯 委員-黃瓊芳 委員-張祝芬
Archive of work produced using the resources of the Imperial College High Performance Computing Service.
Strain engineering has been recently recognized as an effective way to tailor the electrical properties of graphene. In the optical domain, effects such as strain-induced anisotropic absorption add an appealing functionality to graphene, opening the prospect for atomically thin optical elements. Indeed, graphene is cu…