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In DC microgrid, it is common that constant power loads (CPLs) exhibit negative impedance characteristics, which degrades the stability margin of the whole system. This paper focuses on the stability problem of isolated DC microgrid with multiple DC voltage control units and constant power loads. Taking controllers into account, the detailed impedance model of DC microgrid is established, and it shows...
Visible light communications with InGaN-based light-emitting diodes (LEDs) grown on large-diameter (6-inch) and cost-effective Si (111) substrates are investigated experimentally. During epitaxial growth, the transition layers consisted of the step-graded AlGaN buffers incorporated with three low-temperature-grown (∼900 °C) AlN interlayers on AlN/Si substrates that are used to compensate for thermally...
By loss-allowing the two-sector profit model was extended and the strategies of international transfer pricing for multi-national corporations under centralized-decision, tariff, income tax, exchange rate and tax credit were discussed. It was discovered that the profit maximization of multi-national corporations corresponds to the transferring price at the break-even point of the branch when the income...
Folded-beam capacitive-comb-driven micromechanical resonators constructed of polysilicon-filled carbon nanotube (CNT) grass structural material have been characterized via electrical measurement to extract numbers for mechanical properties. The process used here is based on that first demonstrated in, but improved by introduction of a guiding oxide mold and post-fabrication in situ localized annealing...
Internet security issues increasingly prominent, the spread of malicious software and is particularly serious outbreak. Paper analyzed the malicious software brought about by the danger of malicious software, introduced the definition and classification, describes the characteristics of their behavior, focused on the spread of malicious software models, including the SI model, SIS model and the SIR...
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