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Deployment Dynamics of Large-Scale Flexible Solar Arrays with Deployable Mast
Hai-Quan LI,Xiao-Feng LIU,Shao-Jing GUO,Guo-Ping CAI 한국항공우주학회 2017 International Journal of Aeronautical and Space Sc Vol.18 No.2
In this paper, deployment dynamics of large-scale flexible solar arrays with deployable mast is investigated. The adopted solar array system is introduced firstly, then kinematic description and kinematic constraint equations are deduced, and finally, dynamics equation of the system is established by the Jourdain velocity variation principle and a new method to deal with topology changes of the deployable mast is introduced. The dynamic behavior of the system is studied in detail. Simulation results indicate that the proposed model is effective to describe the deployment dynamics of the solar arrays and that the introduced method is applicable for topology changes.
Solution-processed organic UV photodetectors based on polyfluorene and naphthalene diimide
Hai-Guo Li,Gang Wu,Hongzheng Chen,Mang Wang 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Organic ultraviolet (UV) photodetectors with bulk-heterojunction structure were fabricated via a simple spin-coating method by using blend films of poly(9,9-dihexylfluorene) (PFH) and a soluble naphthalene diimide derivative, N,N0-Bis(phenylmethyl)naphthalene-1,4,5,8-tetracarboxylic diimide (NDI-BA), which respectively act as the donor and acceptor. The effect of thermal annealing temperature together with the components blend ratio on the morphology of the composite films, and further the performance of the devices was investigated. The results indicate that balanced charge transfer and transportation can be achieved by controlling the extent of phase separation. By optimization, the device with the 1:1 (by weight) blend layer annealed at 80 ℃ for 15 min demonstrates obvious photoresponse under UV radiation. A photo-to-dark current ratio of over two orders of magnitude, fast response with decay time (decay to 1% of the value before removing of the radiation) of less than 200 ms, and a responsivity of 224 mA/W at ―4 V can be obtained under 1 mW/cm^2 UV radiation at 365 nm. The spectral response covering the region from 300 to 420 nm endows the device potential application in near-UV region as low-cost optical switches or photodetectors.
An investigation of geometric feature recognition in 3D ship data
Guo Hai,Du Lin,Li Guangnian 대한조선학회 2024 International Journal of Naval Architecture and Oc Vol.15 No.-
The intelligent recognition of ship geometric features is a prerequisite for enabling computers to automatically generate and deform ship hull surfaces according to requirements, thereby replacing the work of human designers to improve design efficiency. This paper aims to research the recognition of geometric features in threedimensional ship data using PointNet. To achieve this goal, we first construct two ship point cloud datasets suitable for global feature classification and feature part segmentation of three-dimensional hulls. Subsequently, we conducted recognition capability testing to determine the optimal hyperparameters for identifying ship feature networks. Finally, we employ ship models with non-standard positions to implement data augmentation, enhancing the network’s robustness in recognizing the initial positions of ships and achieving rapid cognition of three-dimensional ship geometric features. The findings of this research will provide technical support for ship design based on artificial intelligence technology.
( Hai-feng Hu ),( Hai-yan Zhou ),( Xian-lin Wang ),( Yuan-shan Wang ),( Ya-ping Xue ),( Yu-guo Zheng ) 한국미생물 · 생명공학회 2020 Journal of microbiology and biotechnology Vol.30 No.8
(R)-2-(4-hydroxyphenoxy)propionic acid (HPOPA) is a key intermediate for the preparation of aryloxyphenoxypropionic acid herbicides (R-isomer). In order to improve the HPOPA production from the substrate (R)-2-phenoxypropionic acid (POPA) with Beauveria bassiana CCN-A7, static cultivation and H<sub>2</sub>O<sub>2</sub> addition were attempted and found to be conducive to the task at hand. This is the first report on HPOPA production under static cultivation and reactive oxygen species (ROS) induction. On this premise, the cultivation conditions and fermentation medium compositions were optimized. As a result, the optimal carbon source, organic nitrogen source, and inorganic nitrogen source were determined to be glucose, peptone, and ammonium sulfate, respectively. The optimal inoculum size and fermentation temperature were 13.3% and 28℃, respectively. The significant factors including glucose, peptone, and H<sub>2</sub>O<sub>2</sub>, identified based on Plackett-Burman design, were further optimized through Central Composite Design (CCD). The optimal concentrations were as follows: glucose 38.81 g/l, peptone 7.28 g/l, and H<sub>2</sub>O<sub>2</sub> 1.08 g/l/100 ml. Under the optimized conditions, HPOPA titer was improved from 9.60 g/l to 19.53 g/l, representing an increase of 2.03- fold. The results obtained in this work will provide novel strategies for improving the biosynthesis of hydroxy aromatics.
Guo, Hai,Guo, Yue,Noh, Hyeon Mi,Moon, Byung Kee,Park, Sung Heum,Jeong, Jung Hyun,Kim, Kwang Ho American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.1
<P>A new and simple method for the synthesis of rare earth ion doped CaF2 (CaF2:RE3+) sub-microparticles is presented, using an ionic liquids based hydrothermal process. The structural properties of the CaF2 nanoparticles were investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The CaF2 nanoparticles exhibited a sphere-like morphology with a diameter of about 150 nm. During the synthesis, the ionic liquid [bmim]BF4 (1-butyl, 2-methylimidazolium tetrafluoroborate) acts as both a co-solvent and reactant. The crucial effect of EDTA-2Na (ethylene diamine tetra acetic acid disodium salt) on the formation of CaF2:RE sub-microparticles was explored and discussed. The strong green (513-569 nm) and strong red (636-685 nm) upconversion emissions of the CaF2:Er3+,Yb3+ nanoparticles (lambda(ex) = 980 nm) were also investigated. The luminescent properties of CaF2:Eu3+ and CaF2:Ce3+,Tb3+ were also evaluated. This work may represent a new step in synthesizing fluoride sub-nanocrystals using ionic liquids.</P>
Zhou, Guo-li,Zhu, Qi,Jin, Hai-guo,Guo, Shan-li Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.3
Associations were analysed between polymorphisms localized in intron 3 of the growth hormone gene (GH-MspI) and milk production traits of 543 China Holstein cows. A PCR-RFLP method was used for identification of genotypes. The following frequencies of genotypes and alleles were found: 0.77, 0.21 and 0.02 for +/+, +/- and -/-, respectively, and 0.87 and 0.13 for $GH^+$ and $GH^-$, respectively. Significant differences between herds were observed in the frequencies of both genotypes and alleles. The results of least squares analysis showed that in all three lactation phases the GH +/+ cows yielded most milk (p<0.01 for lactation I and p<0.05 for lactations II and III), whereas +/- cows showed higher milk fat content than +/+ individuals (p<0.05 for lactation I and II, and p<0.01 for lactation III). The +/+ cows yielded more fat than +/- individuals (p<0.01 only in lactation I). The +/+ cows yielded more milk protein than +/- individuals (p<0.01 for lactation I, II, and III). The +/+ cows produced milk of higher protein content than that of +/- individuals (p<0.05 only in lactation II). Based on these results, we conclude that the +/+ of GH locus should be the favored genotype in China Holstein cow breeds for use in marker-assisted selection programmes.
Jin, Hai-Guo,Zhao, Yu-Min,Zhou, Guo-li Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.12
Five China native cattle breeds have been characterized by using 10 microsatellite DNA markers. The studied populations can be divided into five groups: Luxi cattle, Nanyang cattle, Jinnan cattle, Qinchuan cattle and Yanbian cattle. Allele frequencies were calculated and used for the characterization of the breeds and the study of their genetic relationships. Heterozygosity, polymorphism information content, the effective number of alleles was calculated. Nei' standard genetic distance (1978) was calculated and used for a neighbor-joining tree construction. NJ tree showed that Luxi cattle, Nanyang cattle, Jinnan cattle and Qinchuan cattle are closely related, whereas Yanbian cattle are clearly distinct from other four populations. The genetic relationship of five breeds corresponds to their history and geographic origins. This work analyzes the recent origin of these populations and contributes to the knowledge and genetic characterization of China native breeds.