Materials Literature
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Een elektronenmicroscoop is een apparaat waarin met behulp van een elektronenbundel een klein voorwerp vergroot kan worden afgebeeld. Zoals een lichtbundel gefocusseerd kan worden door lenzen van glas, kan een elektronenbundel gefocusseerd worden door elektrostatische of magnetische velden. Elektronen worden uit een m…
The problem of promptly finding faulty insulator strings of 110 kV overhead power lines is addressed. The capacitances of PS-70E glass insulators in their new (delivered) state and in the state destroyed as a result of electric breakdown are measured. The residual dielectric strength and capacitance of destroyed insul…
This work deals with the preparation and subsequent diagnosis of thin W-B-C thin films. These thin films are deposited by magnetron sputtering from three targets. The effect of their composition and the deposition parameters on the structure and properties of the thin films is investigated. The composition of the thin…
In this presentation, our strategies toward developing high performance oxygen evolution reaction (OER) catalysts will be summarized; as-developed catalysts were investigated from nano scale to system level; in operando near-ambient pressure XPS technique was applied for electrocatalysis mechanism exploration.Abstract…
本文制备了对Cu(Ⅱ)具有选择性识别作用的CdTe /CdS@ SiO_2@ BPEI-CQDs双发射比率荧光探针。基于Cu(Ⅱ)能使探针表面的BPEI-CQDs荧光猝灭的现象,建立了测定Cu(Ⅱ)的比率荧光新方法。在最佳条件下,该方法测定Cu(Ⅱ)的线性范围为0.40~70 μmol /L,检测限为0.27 μmol /L。建立的方法已被成功用于人体尿液及血浆中Cu(Ⅱ)的测定。
Metal-coated nanostructured surfaces have shown promise as substrates for surface-enhanced Raman spectroscopy (SERS) as they allow chemical trace detection with high sensitivity and rapid response.This sensitivity and specificity makes SERS especially interesting for environmental and biological analysis.Metalcapped s…
A dissertation submitted to the Faculty of Science of the University of Witwatersrand, Johannesburg, in full fulfilment of the requirements for the degree of Master of Science. May 2017
International audience
Aufgrund ihrer reichen Fotophysik stellen azobenzolfunktionalisierte molekulare Glaser und Polymere eine faszinierende Materialklasse mit einem grosen Anwendungsbereich dar. Wenn die kovalent gebundenen Azobenzoleinheiten UV- oder blauem Licht ausgesetzt sind, fuhren sie wiederholt trans-cis-trans-Isomerisierungszykle…
With the wide use of wood in construction, it is important to know the properties of wood burning for the proper use of this raw material. The mass loss calorimeter is a device that allows the achievement of parameters involved in the burn. Parameters such as effective heat of combustion, mass loss, heat release rate,…
Recently Evers et al. [1] have shown that snowman particles assemble into hollow virus-like capsules in the absence of template. \nIn this thesis I will show the aggregation behavior of the snowman particles in the presence of oppositely charged large template. \nAlso the aggregation behavior of snowman particles with…
SLM parts are built by successively melting layers of powder in a powder bed. Process parameters are often optimized experimentally by laser scanning a number of single tracks and subsequently determining which settings lead to a good compromise between quality and build speed. However, experimentation only does not y…
An asymmetrical SiNx-based polarization beam splitter at 810 nm are proposed and fabricated in this work. The simulation results show that the extinction ratio of > 20 dB and the insertion loss of < 0.6 dB can be achieved for both transverse-electric (TE) and transverse-magnetic (TM) polarizations at 810 nm.
MODELING OF THE WORK OF A SINGLE PILE DRILL \nUNDER CONDITIONS ADDITIONAL “CONSTRAINT” \nT. ULASIK, A. BALICH
Stainless steels are a classification of materials that have been available for over 100 years and over that time manufacturers have created variations on chemical composition and manufacturing route, to create materials that meet specific criteria set by the consumer. One type of stainless steel, ferritic, is restric…
Due to the unique features of the system generated electromagnetic pulse and its effects on electronics and electrical systems, much research and design efforts have gone into studying and developing radiation hardened systems that can withstand or limit the damage from this phenomenon. Since the time that above groun…
A key challenge in the fabrication of ferromagnetically filled carbon nano-onions (CNOs) is the control of their thickness, dimensions and electric properties. Up to now literature works have mainly focused on the encapsulation of different types of ferromagnetic materials including α-Fe, Fe3C, Co, FeCo, FePd3 and oth…
Solar cells are showing significant promise to become the solution for the growing energy needs of our world. However for this to happen, new disruptive technologies with high efficiency and low cost are needed in the market. One possibility comes from multijunction thin film solar cells based on a-Si alloys and nc-Si…
Organic-inorganic hybrid perovskite solar cell is a new type of thin film photovoltaic technology and has achieved extraordinary improvements in power conversion efficiency in a relatively short time. One of the most important factors leading to the rapid advancement of perovskite solar cells is the ability to manipul…
In continuum models bilayers are homoclinic structures that are generically unstable within second-order systems as the associated translational mode has a single zero. Within the single-component, functionalized Cahn-Hillard (FCH) free energy the unstable mode balances against surface diffusion to generate pearling m…