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Correlations between leaf^ stem and root functional traits of common tree species in an evergreen broad-leaved forest
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청소년의 유산소운동 강도 및 지속시간에 따른 식욕의 변화
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자궁경부 세포진검사에서 ASCUS와 LSIL로 진단된 환자의 임상적 의의와 처치
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화성암 중의 Selenium 정량
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Effects of 30 min of aerobic exercise on gene expression in human neutrophils
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THE FUTURE OF INDIAN UNIVERSITIES: Comparative and International Perspectives
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- 저자 : Xingqian Zhao (검색결과 2 건)
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Dynamic characteristics of permanent magnetic thrust bearing used in vessels
Xingqian Zhao,Changgeng Shuai,Wei Xu,Yuanchao Zhang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.1
The axial stiffness of a permanent magnetic thrust bearing (PMTB) decreases from 10 9 N/m to 10 7 N/m compared with the sliding bearing and the increment of thrust makes the stiffness diminish rapidly. In this paper, theoretical analysis and experiments were applied to research the axial dynamic characteristics of the PMTB. In theoretical analysis, the RungeKutta method is adopted to yield the time-domain response of the PMTB rotor under excitation of original velocity. The energy conservation method (ECM) is used to verify the calculating results, which proves that the Runge-Kutta method can obtain physically reasonable results. The analysis reveals that, due to the non-linearity of the PMTB, the rotor’s vibration exhibits a “stripping” phenomenon compared with harmonic wave; and with the increment of axial static displacement (ASD), smaller excitation can make the PMTB generate this phenomenon. The stripping becoming obvious means the bearing is increasingly close to instability. In the experiments, a disc spring was used to constitute the testing system together with the PMTB. The curve fitting method was used to deal with the abstracted peak values from displacement and acceleration auto-power spectrum and further obtain the dynamic stiffness of the PMTB. The test results obviously show that the PMTB stiffness decreases with the ASD increment, and in general the dynamic stiffness is smaller than the static one, which proves the existence of the stripping phenomenon.
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Significance of Viable but Nonculturable Escherichia coli: Induction, Detection, and Control
( Tian Ding ),( Yuanjie Suo ),( Qisen Xiang ),( Xihong Zhao ),( Shiguo Chen ),( Xingqian Ye ),( Donghong Liu ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.3
Diseases caused by foodborne or waterborne pathogens are emerging. Many pathogens can enter into the viable but nonculturable (VBNC) state, which is a survival strategy when exposed to harsh environmental stresses. Pathogens in the VBNC state have the ability to evade conventional microbiological detection methods, posing a significant and potential health risk. Therefore, controlling VBNC bacteria in food processing and the environment is of great importance. As the typical one of the gram-negatives, Escherichia coli (E. coli) is a widespread foodborne and waterborne pathogenic bacterium and is able to enter into a VBNC state in extreme conditions (similar to the other gram-negative bacteria), including inducing factors and resuscitation stimulus. VBNC E. coli has the ability to recover both culturability and pathogenicity, which may bring potential health risk. This review describes the concrete factors (nonthermal treatment, chemical agents, and environmental factors) that induce E. coli into the VBNC state, the condition or stimulus required for resuscitation of VBNC E. coli, and the methods for detecting VBNC E. coli. Furthermore, the mechanism of genes and proteins involved in the VBNC E. coli is also discussed in this review.
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