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Fubao Liu,Xiao Liu,Biwu Zhu,Hui Yang,Gang Xiao,Mingyue Hu 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6
High strain-rate rolling (≥ 10 s−1) has been successfully employed to produce AZ31 magnesium alloy sheets to a high reductionof 82% with a fine grain structure in a single pass. The rolled sheets inevitably undertake various forming processessuch as press and deep forming in the fabrication stage. To investigate the formability, the Erichsen tests were carried out onhigh strain rate rolled AZ31 magnesium alloy sheets at room temperature. The relationship among mechanical properties,microstructure and formability were investigated. The crack behavior during Erichsen tests was also studied. It was foundthat the formability was related to the lowest in-plane tensile strengthen and dislocation density of initial microstructure. The competitive relationship between micro-crack and twinning/shear bands would also influence the formability of highstrain rate rolled magnesium alloy sheets. Deformed shear band with substaintial twins prohibits the crack extension andenhances strengthen of materials in front of crack tip.
The Event Detection of Serving a Ball in Sports Video
Jingmeng Sun,Yang Liu,Gang Liu1,Yang Wang,Haitao Yang 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.3
Tennis video’s serve events were detected. In other words, athletes area were obtained to calculate particle of athletes area and particle shift in adjacent frame by using background subtraction algorithm. And then tennis video’s serve events were inferred, according to specific constraints on serve, through establishing ontology and setting SWRL rules.
Study of a Magnetic Switch for the SG-III Energy Module
Liu Gang,Lin Fuchang,Liu Yi,Li Hua,Lee Li,Zeng Han 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
The SG-III energy module, which supplies pumping energy for Xenon (Xe) flashlamps, is one of the most important modules in large laser facilities. A two-electrode spark gap switch is used as the main discharge switch and is triggered by a Marx generator. The peak value of the output impulse generated by the Marx generator is about 180 kV, and its rise time is about 10 ns. In order to prevent the key elements (e.g., Xe flashlamps) from being damaged by the trigger impulse, a magnetic switch is used to isolate the high-voltage impulse. The design, working principle and performance of a magnetic switch based on Fe-based nanocrystals are presented in this paper. Compared with the magnetic switch employed in magnetic pulse compressors (MPCs), the magnetic switch in SGIII works under a single nanosecond impulse. It corresponds to the initial magnetization curve of the B-H curve. The parameters of the Fe-based nanocrystals are obtained by experiments. The unsaturated inductance, saturated inductance and saturation time are the key parameters of the magnetic switch in SG-III and are considered in the design. Finally, the experimental results for the magnetic switch in SG-III are presented.
Gang Li,Ming Tang,Wei Hu,Guangcun He,Hong Liu,Xuequn Liu,Rui Qin 한국식물학회 2010 Journal of Plant Biology Vol.52 No.4
Distant hybridization between rice species and their genome interactions have become the hot points of genetic research. The new formed hybrid was unstable and many of the alien chromosomes would be excluded out in the meiosis procedure. In this study, we investigated the phenomenon that the monosomic alien addition lines (MAALs) of Oryza officinalis (CC)–Oryza sativa (AA)inherited in the genomic and cytoplasmic environments of cultivated rice. In a series of backcross programs, every time the MAALs were backcrossed with the recurrent parent Hejiang19, we get a portion of the backcross progenies that were similar to the female parent MAALs in morphological characters (with rolled leaves) and chromosome constitutions (2n+1). The monosomic alien chromosome exhibited stable inheritance in the genomic and cytoplasmic environments of cultivated rice. Molecular biology and fluorescence in situ hybridization (FISH)analyses on mitotic cells showed that the alien chromosomes in MAALs were inclined to be transferred integrated into the backcross progenies with rolled leaves and no big fragments of alien chromosomes introgressing into the chromosomes of cultivated rice. By FISH analysis on the meiotic cells, we proved that the single alien chromosome performing nonstandard meiosis and behaving like a dispensable genetic factor, which would be the cytological reasons for the stable inheritance of alien chromosomes.