Search

We explored the growth rate and morphological characteristics of graphene nanowalls (GNWs) on copper (Cu), stainless steel (SUS), quartz and silicon (Si) substrates by changing the growth time using microwave plasma-enhanced chemical vapor deposition (MWPCVD). Furthermore, we investigated the impact of catalytic and non-catalytic substrates on the growth features of GNWs. The properties of GNWs were characterized using scanning electron microscopy (SEM) and Raman spectroscopy. The growth of GNWs occurred just after supplying the precursor on the Cu substrate, but those on SUS, quartz and Si delayed about 5 min, 10 min and 15 min, respectively, due to the low catalytic activity of the substrate. Once the growth started, there was not much of a difference in the growth rate. The average growth rate was about 2 nm/s. The crystallinity of GNW was improved with increasing growth time. It was found that Cu is the best substrate to get high-quality GNWs, but MWPCVD is a suitable technique to obtain GNWs on a variety of substrates at relatively low temperatures. [ABSTRACT FROM AUTHOR]

SStarting from the analysis of the significance of characteristic plant landscapes in the campus, this paper took Guang'an Vocational & Technical College for example, combined with the greening practice of the college, designed the planning layout of "one axis, two phases, three rings, and five areas" of the college, and put forward suggestions for campus construction featuring plant landscapes. [ABSTRACT FROM AUTHOR]

As pointed out by "Basel New Capital Accord", modern commercial banks should pay attention to the relevance of market risk, credit risk and operational risk when managing them. This thesis starts with the risk appetites of different bankers, proposes the risky assets optimized configuration of commercial banks basic on risk integration measurement model, and provides the solution algorithm combining stochastic simulation, neural network and genetic algorithms. With the optimized configuration of market risk assets and credit risk assets of Bank of China (BOC) and China Merchants Bank (CMB) as example, this thesis has validated the effectiveness of model and solution. This model indicates that basic on historical data, bankers can determine the level of integrating risk according to their risk appetites. This thesis is the forward-looking for the optimized configuration of risk assets of commercial banks, and provides new ideas for assets configuration. [ABSTRACT FROM AUTHOR]