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Partial Shade Optimizes Photosynthesis and Growth in Bayberry (Myrica rubra) Trees
Guanghui Zeng,Yanping Guo,Jianxu Xu,Meijun Hu,Jie Zheng,Zhenwang Wu 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.3
This study investigates the effects of radiation heat-load reduction under different shading conditions on thegrowth of three-year-old bayberry (Myrica rubra) trees from 1 July through 31 October 2007 in the Zhejiang Province,a warm subtropical region of China. The trees were grown under direct sunlight (control) and under 25%, 50%, and75% shading conditions using black plastic nets. Stomatal conductance and photosynthesis were greatest under 50%shading, as were plant height and leaf and root dry weights. Twenty-five percent shading did not significantly influenceplant height or root and leaf dry weights, whereas 75% shading resulted in a decrease in root and leaf dry weightswhen compared with the controls. The photochemical efficiency and electron transport of PSII increased under shadedconditions due to an increase in D1 protein. The concentrations of chlorophyll a and b and the total chlorophyllcontent in leaves were increased in plants grown under 25% and 50% shading, but reduced in those grown under75% shading. Under 50% shading, growth and biomass increased due to increased photosynthesis, which resulted fromdecreased photodamage and increased chlorophyll concentration. These data show that 50% shading promotes optimalgrowth in bayberry plants.
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Quasi-Fixed-Frequency Hysteresis Current Tracking Control Strategy for Modular Multilevel Converters
Mei, Jun,Ji, Yu,Du, Xiaozhou,Ma, Tian,Huang, Can,Hu, Qinran The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
This study proposes a quasi-fixed-frequency hysteresis current tracking control strategy for modular multilevel converters (MMCs) on the basis of voltage partition principle. First, by monitoring the grid voltage and the deviation between the output and reference currents, the output voltage is determined, thus prompting the output current to quickly and efficiently track the given current. Second, the voltages of the upper/lower capacitor of the arm and the voltages between the upper and lower arms are balanced by combining these arms with virtual loop mapping and arm voltage balance control, respectively. In particular, the proposed method is designed for any level and number of sub-modules. The validity of the proposed method is verified by simulations and experimental results of a five-level MMC prototype.
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