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A Unify Unbalance Compensation Strategy for Islanded Microgrid with Unbalanced Condition
Hongtao Shi,Fang Zhuo,Zhiqing Geng,Dong zhang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Due to the unbalance condition, the voltage of microgrid would be deteriorated. In this paper, a unify unbalance compensation strategy is proposed to suppress the unbalanced voltage and the voltage variation for islanded microgrid with unbalanced condition. Comparing to the traditional compensation strategy, where only negative sequence components of voltage are suppressed, in the proposed scheme, the voltage and frequency variations resulted from the unbalanced condition are also eliminated. A simulation model of microgrid is developed in PSIM and the simulation and experimental results verify the effectiveness of the proposed method.
LOW TEMPERATURE SYNTHESIS OF Fe-DOPED ZnO NANOROD BUNDLES IN AQUEOUS SOLUTION
FENGXIA GENG,HUI-MING CHENG,ZHIGANG ZHAO,HONGTAO CONG,JINBO BAI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2006 NANO Vol.1 No.2
Pure and Fe-doped ZnO nanorod bundles were synthesized in aqueous solution at low temperature, in which inexpensive reagents such as Zn(NO3)2, NaOH and Fe(NO3)3 were used as precursors. The composition of the final product can be roughly tuned by the precursor ratio used. Energy dispersive X-ray spectroscopy confirms the successful incorporation of Fe element into ZnO nanorods, and X-ray diffraction reveals that ZnO nanorod bundles have a pure hexagonal wurtzite-phase structure. UV–vis spectroscopy show that the spectrum shifts to longer wavelength with increasing iron doping.
Xiaolong Li,Shubao Geng,Hanjie Chen,정철의,Chunliang Wang,Hongtao Tu,Jinyong Zhang 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.1
The apple leafminer, Phyllonorycter ringoniella Matsumura (Lepidoptera: Gracillariidae), is an important insect pest of apple, with four to six generations a year in Korea, Japan, and China. The effect of mass trapping with sex pheromone traps on P. ringoniellawas investigated in apple orchards in 2015 in Yinchuan, China. Trap density treatments were 0, 75, 150, and 225/ha in the Control, T1, T2, and T3 orchard blocks, respectively. Average numbers of male catches permonitoring trapwere significantly lower in T2 and T3 treatments and highest in the control. Control efficiencies estimated fromthe leaf damage were 86.67±4.71, 97.23±3.93, and 100% in T1, T2, and T3, respectively. Significant within-tree migration of the moths from the lower part to the upper part was indicated by the shift of trap catches from lower (1–2 m high) to upper portions (3 m high) of the tree from early August. Mass trapping with sex pheromone traps can be one effective and environmentally friendly method to reduce the P. ringoniella populations in apple orchards. Trap density of 150/ha and hanging at 2 m height was recommended for growers to control and monitor its population, respectively
Yingguang Liang,Chunxiang Cui,Hongtao Geng,Lu Liu,Sen Cui,Shichao Yang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.4
In this work, as an inoculant, in-situ BaB6/Al composites was fabricated and used to refine the α-Al dendrites and modify theeutectic Si of A356.2(Al–7Si–0.3Mg) alloy. BaB6/Al ingot and ribbon composites mainly contain two phases, α-Al and BaB6. In BaB6/Al ribbons, nano-size BaB6ceramic particles exist and disperse uniformly which help to better exert the inoculanteffect in A356.2 alloy. YS, UTS, EL and HV of B2 alloy are 36.3%, 18.3%, 46.4% and 20.8% higher than the base alloy (B0),respectively. The ductile fracture characteristics are more obvious. Moreover, B2 alloy shows the best corrosion resistance. Aland BaB6form a clear, stable and well matched interface, so BaB6particles can act as the heterogeneous nucleation of α-Aland refine the A356.2 alloy. Furthermore, the combined of free micro-alloying elements Ba and B in BaB6/Al compositespromote the twins formation, which change the eutectic Si to fine fibrous and granular shape.
LOW TEMPERATURE SYNTHESIS OF Mg(OH)2 NANOTUBES IN AQUEOUS SOLUTIONS OF BLOCK COPOLYMER P123
HUI-MING CHENG,ZHIGANG ZHAO,FENGXIA GENG,HONGTAO CONG,JINBO BAI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2006 NANO Vol.1 No.2
A simple aqueous solution-based block-polymer-assisted method was developed for the synthesis of Mg(OH)2 nanotubes using inexpensive starting materials (MgSO4 and NaOH) with significant advance of bringing down the average outer diameter to the regime below 10 nm. The synthesized nanotubes are found to possess a relatively high specific surface area up to 64 m2/g, which may suggest their potential value for use in the catalysis field. The Barrett–Joyner–Halenda pore-size distribution plot reveals a bimodal distribution centred at 3.4 and 17.3 nm, which may be from the tunnel cavity and the aggregated pores of Mg(OH)2 nanotubes, respectively. This method can be widely used to fabricate other inorganic 1D nanostructured materials and easily realized in industrial-scale synthesis.