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Phosphor-free monolithic high-efficiency tunable white LEDs are realized on ternary InGaN substrates. This proof-of-concept study demonstrates that high quantum efficiency and stable white color emission are achieved by using ternary substrates and correctly-engineered device structures.
Based on recording the inputs and outputs of control systems and its control modules and control blocks during on-site disturbance experiments and tests, an abnormal signal analysis based method for locating oscillation source in control blocks is proposed by intensively comparing the differences between the ideal standard responses and the actual response of a control system and its control modules...
This paper presents a novel approach for estimating mode shape for participation (MSFP) among areas or main power plants involving inter-area oscillation (IAO) mode, by analyzing power deviation (ΔP) signals. The case study has been carried out on a planning case in East China Power Grid (ECPG). The results indicate that the proposed algorithm is effective, and imply its potential applicability in...
The light extraction efficiency of InGaN light-emitting diodes employing microsphere arrays with different refractive indices and diameters were studied, and the use of anatase TiO2 microsphere arrays resulted in 2.4-times increase in light extraction efficiency.
We demonstrate that as the period of multiple InGaN/GaN quantum wells is increased from 1 to 16, photoluminescence intensity exhibits strong saturation whereas output power of broadband THz pulses is scaled up superlinearly.
We have generated broadband THz pulses within eight periods of InGaN/GaN quantum wells due to dipole radiation following generation of spatially-separated electrons and holes. Output powers as high as 1 μW have been obtained.
The growths of InGaN quantum wells light-emitting diodes with AlInN thin barrier were performed by metal-organic chemical vapor deposition, and this approach led to reduction in thermionic carrier escape and efficiency droop.
Excitation system plays a key role in realistic simulation and analysis of the dynamic performance of electrical power systems. However, simulation results with parameters provided by manufacture can usually not match the real operation. Therefore, parameter identification based on field data is focused on. In this paper, parameter identification methods based on particle swarm optimization (PSO)...
Excitation system plays a key role in realistic simulation and analysis of the dynamic performance of electrical power systems to a large extent. Therefore, it is desire to obtain the real parameter of the excitation system in order to study the dynamic performance of power systems. This paper presents a practical technique to address the excitation system identification. The measurement was performed...
The growths and characteristics of staggered InGaN quantum wells (QWs) and type-II InGaN-GaNAs QWs are presented for high-efficiency green-emitting light-emitting diodes (LEDs). Approaches for enhancing internal-quantum-efficiency, light-extraction-efficiency, and efficiency-droop in nitride LEDs are discussed.
With the quick development of power plant industry, the effect quantity of thermal discharge incearses gradually and so dose its on water enviormnent. But it doesn't have special criterion of the warm water drainage at present. Based on the comprehensive summary of the progress in related area and the present situation of the warm water in our country, the paper indicates our country environmental...
This paper applies two methods to evaluate the economic effects of the policy of "replacing small units with large ones (RSWL)," one is Discounted Cash Flow (DCF) method which performs a technology economic analysis both from the financial and the economic perspectives, the other one is to use the Real Option theory to study the lagging investment problem of the big unit. Through an illustrative...
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