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Bai, Jiahai,Piao, Jiasi,Gao, Jie,He, Jing,Du, Qingyang,Li, Chengfeng The Korean Ceramic Society 2019 한국세라믹학회지 Vol.56 No.4
Porous alumina ceramics with addition of 0, 5, 10, 15, and 20 wt% Al(H<sub>2</sub>PO<sub>4</sub>)<sub>3</sub> were sintered at 1300, 1350, and 1400℃. The effects of the Al(H<sub>2</sub>PO<sub>4</sub>)<sub>3</sub> addition on crystal phases, water absorption, open porosity, pore size distribution, microstructures, and flexural strength were studied extensively. The experimental results revealed that only characteristic peaks of corundum were indexed in the XRD patterns of the as-prepared porous ceramics. The water absorption and open porosity of the porous Al<sub>2</sub>O<sub>3</sub> ceramics increased remarkably with an increase in Al(H<sub>2</sub>PO<sub>4</sub>)<sub>3</sub> addition. The flexural strength first increased to a maximum value when 5 wt% Al(H<sub>2</sub>PO<sub>4</sub>)<sub>3</sub> was added and then decreased as additional Al(H<sub>2</sub>PO<sub>4</sub>)<sub>3</sub> was further added. SEM images showed that the average Al<sub>2</sub>O<sub>3</sub> grain size in the porous ceramics changed in an opposite way as the flexural strength. The porous Al<sub>2</sub>O<sub>3</sub> ceramics with 10 wt% Al(H<sub>2</sub>PO<sub>4</sub>)<sub>3</sub> addition exhibited comparable flexural strength to the ceramics without Al(H<sub>2</sub>PO<sub>4</sub>)<sub>3</sub> addition, although the latter had much higher porosity.
Lateral Control for Ultra-low Altitude Airdrop Based on the L1 Adaptive Control Augmentation
Jinyong Chang,Jiahai Zhu,Ri Liu,Wen-han Dong 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.2
This paper presents a novel controller based on the L1 adaptive control to enhance the flight safety in the airdrop mission. An optimal controller produces the state feedback control signals, while a matched reference model is determined. First, we transform the system nonlinearity into the matched and unmatched uncertainty of the L1 control system. Then, leveraging the advantages of the outer loop PID controllers in the lateral deviation, we design the lateral flight control system. Simulation results reveal that the controllers present strong robustness, high adaptive gain, and suppress the undesirable high frequency dynamics.
Sequence Analysis of cytb Gene in Echinococcus granulosus from Western China
Xiuqin Zhong,Ning Wang,Dandan Hu,Jiahai Wang,Tianyu Liu,Xiaobin Gu,Shuxian Wang,Xuerong Peng,Guangyou Yang 대한기생충학열대의학회 2014 The Korean Journal of Parasitology Vol.52 No.2
Echinococcus granulosus is the causative agent of cystic echinococcosis with medical and veterinary importance in China. Our main objective was to discuss the genotypes and genetic diversity of E. granulosus present in domestic animals and humans in western China. A total of 45 hydatid cyst samples were collected from sheep, humans, and a yak and subjected to an analysis of the sequences of mitochondrial cytochrome b (cytb) gene. The amplified PCR product for all samples was a 1,068 bp band. The phylogenetic analysis showed that all 45 samples were identified as E. granulosus (genotype G1). Ten haplotypes were detected among the samples, with the main haplotype being H1. The haplotype diversity was 0.626, while the nucleotide diversity was 0.001. These results suggested that genetic diversity was low among our samples collected from the west of China based on cytb gene analysis. These findings may provide more information on molecular characteristics of E. granulosus from this Chinese region.
Effects of SiC content on microstructure and properties of carbon/ceramic conductive composites
Xiao Gao,Xin Zheng,Jie Gao,Juncheng Liu,Jiahai BAI,Guoliang Yuan 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.12
The effects of SiC content on the phase composition, microstructure, sintering performance, mechanical and electricalproperties of the carbon/ceramic conductive composites were investigated. The results show that when SiC content increasesfrom 1 wt% to 3 wt%, lamellar graphite structure can be seen in the microstructure of the composites, and the porosity andwater absorption increases gradually. With further increase of SiC content to 6 wt% and 9 wt%, lamellar graphite disappears,and granular SiC crystals fill in the ceramic phase, thus increasing the densification degree of the composites. When SiCcontent is in the range of 1 wt% to 3 wt%, the shrinkage rate decreases sharply while the weight loss decreases a little. As SiCcontent increases from 3 wt% to 9 wt%, both the shrinkage rate and weight loss basically keep unchanged. With the increaseof SiC content, the bending strength of the composites first decreases and then increases, and finally reaches the peak value at9 wt% SiC. However, the resistivity presents an opposite variation trend, and the conductivity is best as SiC content is 9 wt%.