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Comparison on Staircase, PWM and Partial PWM Scheme for Hybrid Cascaded Multilevel Inverter

100%

Sang Z. , Mao C. , Wang D.

2013

tom R. 89, nr 5

67-71

Cascaded Multi-level Inverter (CMLI) consists of H-bridge modules which can generally be divided into the one with the same DC bus voltage and another with different DC bus voltages. By using the same power devices as a standard seven-level 3H-bridge converter, the proposed converter operates with 15-level resolution, with separate DC voltage sources of voltage ratio 4:2:1. The total harmonic distortion (THD) and switching losses of the proposed hybrid cascaded converter among staircase, PWM and partial PWM control are compared with analysis and Saber simulation.

W niniejszym artykule przedstawiono trzy metody modulacji dla 15-poziomowego kaskadowego falownika hybrydowego. Dokonano porównania analitycznego i symulacyjnego metod przełączania schodkowego, modulacji PWM i częściowej PWM pod względem THD oraz strat łączeń. Analiza i symulacja wyników wykazują, że proponowane metody modulacji pozwalają na uzyskanie wysokiej jakości napięcia.

Improving reservoir thickness prediction using seismic attributes and attributes fusion

100%

Liu H. , Lei X. , Mao C. , Li S.

Acta Geophysica

2014

tom Vol. 62, no. 3

544--563

Usage of any single attribute would introduce unacceptable uncertainty due to limited reservoir thickness and distribution, and strong lateral variations in lithological traps. In this paper, a wide range of prestack and post-stack seismic attributes is utilized to identify a range of properties of turbidity channel sandstone reservoir in Block L118 of J Oilfield, China. In order to better characterize the turbidity channel and lower the uncertainty, we applied multi-attribute fusion to weight a variety of seismic attributes in terms of their relevance to the identification of turbidity channel reservoir. Turbidity channel boundary is clearly present in the new attribute and the reservoir thickness prediction is improved. Additionally, fluid potential of reservoir was predicted using this fused attribute with a high value anomaly indicating high fluid potential. The multi-attribute fusion is a valid approach for the fine prediction of lithologic reservoirs, reducing the risks typically associated with exploration.

Exogenous melatonin reduced blood pressure in late-term ovine fetus via MT1/MT2 receptor pathways

75%

Tao J. , Lv J. , Li W. , Zhang P. , Mao C. , Xu Z.

2016

tom 16

nr 3