Infuence of Dynamic Characteristics of Induction Motor on Voltage Sag Caused by Short Circuit Fault

Jiming Chen,Hai Zuo,Qianyu Yu,Lizhi Qi,Mingxiao Zhu 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4

Voltage sag is a signifcant problem that afects the quality of power, and some researches have been performed on this theme. The characteristic of load is an important factor afecting the voltage sag, which is rarely studied. This paper investigates the infuence of dynamic characteristics of induction motor on voltage sag caused by short circuit fault. The analytic expression of induction electromotive force is derived by space vector method. The mechanism of amplitude and waveform changes caused by dynamic load characteristics of induction motor are analyzed. The results indicate that the voltage at the load terminal of the induction motor is higher than that at the static load during the sag. Besides, the voltage sag waveform is not in rectangular shape. The static load terminal voltage returns to normal value quickly, while the voltage at the load terminal of the induction motor needs about 200 ms after the fault is removed. Induction motors can reduce the magnitude of voltage sags caused by short circuit faults, but will extend the duration. At the same time, the bigger the induction motor capacity is, the longer the voltage recovery time after sag is.

Raman signature from brain hippocampus could aid Alzheimer's disease diagnosis.

Chen, Pu,Shen, Aiguo,Zhao, Wei,Baek, Seong-Joon,Yuan, Hua,Hu, Jiming Optical Society of America 2009 Applied Optics Vol.48 No.24

<P>Micro-Raman spectroscopy (MRS) is used for the first time to our knowledge to investigate brain hippocampus tissue from Alzheimer's disease (AD) infected rats. In situ Raman analysis of tissue sections provides distinct spectra useful for distinguishing AD from normal state. The biochemical changes of brain hippocampus tissue including the deposit of beta-amyloid (Abeta) protein, the increase of cholesterol, and hyperphosphorylated tau are observed through MRS when AD occurs. A more convincing multi-Raman criterion based on single Raman peaks, and further in combination with statistical analysis of the entire Raman spectrum, is found capable of classifying brain hippocampus tissues with different pathological features. This study demonstrates the brain hippocampus is an important candidate for considering the early pathological state of AD, and Raman signatures from the brain hippocampus could aid AD diagnosis. In addition, Raman results undoubtedly confirm simultaneous changes of cholesterol and Abeta in the progression of AD.</P>

Effects of rhizosphere microbiome on the fruit of Cinnamomum migao H. W. Li: culture, amplicon sequencing, and metagenomic sequencing

Chen Jingzhong,Liu Jiming,Liao Xiaofeng 한국원예학회 2023 Horticulture, Environment, and Biotechnology Vol.64 No.5

Cinnamomum migao H. W. Li is an evergreen tree belonging to the Lauraceae family and is endemic to China. Previous studies have found that the rhizosphere microbiome associated with the C. migao wild population plays an essential role in the production of fruit chemical components. However, it remains unknown whether the rhizosphere microbiome aff ects the production of fruit chemical compounds in cultivated C. migao population. Herein, we studied a 10-year-old fruit-bearing population of C. migao and used techniques such as culturing, amplicon sequencing, and metagenomic sequencing to explore the changes in the rhizosphere microbial community structure over three periods. Meanwhile, the molecular ecological network of the rhizosphere microbiome was constructed based on random matrix theory. The unidentifi ed species were found to belong to fungi and Capnodiales. Sphingomonas sp. mm-1 and Streptomyces scabiei in network hubs were recognized in over three fruiting periods. Further, four network hubs were signifi cantly related to fruit chemical compounds production in C. migao . The higher the number of species annotated, the better the explanation for fruit chemical compounds production in C. migao . The rhizosphere microbiome was found to exert a synergistic eff ect by increasing fruit chemical component production in C. migao . This was evinced through KEGG analysis, which revealed the diff erent metabolic activities aff ected by the rhizosphere microbiome. This study revealed the potential ways and putative keystone taxa of rhizosphere microbiome aff ecting fruit component production in C. migao , which opens up new opportunities for further manipulation and development of the rhizosphere microbiome to promote plant productivity.

Effect of Bacterial Wilt on Fungal Community Composition in Rhizosphere Soil of Tobaccos in Tropical Yunnan

Yuanxian Zheng,Jiming Wang,Wenlong Zhao,Xianjie Cai,Yinlian Xu,Xiaolong Chen,Min Yang,Feiyan Huang,Lei Yu,Yuansheng He 한국식물병리학회 2022 Plant Pathology Journal Vol.38 No.3

Bacterial wilt, which is a major soil-borne disease with widespread occurrence, poses a severe danger in the field of tobacco production. However, there is very limited knowledge on bacterial wilt-induced microecological changes in the tobacco root system and on the interaction between Ralstonia solanacearum and fungal communities in the rhizosphere soil. Thus, in this study, changes in fungal communities in the rhizosphere soil of tobaccos with bacterial wilt were studied by 18S rRNA gene sequencing. The community composition of fungi in bacterial wilt-infected soil and healthy soil in two tobacco areas (Gengma and Boshang, Lincang City, Yunnan Province, China) was studied through the paired comparison method in July 2019. The results showed that there were significant differences in fungal community composition between the rhizosphere soil of diseased plants and healthy plants. The changes in the composition and diversity of fungal communities in the rhizosphere soil of tobaccos are vital characteristics of tobaccos with bacterial wilt, and the imbalance in the rhizosphere microecosystem of tobacco plants may further aggravate the disease.

Design of Shield Blanket Near NB Port and Development of Be/Cu Joining for ITER

Fu Zhang,Elio Filippo,Jiming Chen,Weishan Kang,Youkun Fu 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III

The design of two shield blanket modules near the neutral beam (NB) port was developed at Southwestern Institute of Physics (SWIP) in collaboration with the ITER International Team. Some results are given in this paper. The HIP technology for Be/Cu joining in the first wall is being qualified at SWIP and it is also introduced.

Two Arbuscular Mycorrhizal Fungi Alleviates Drought Stress and Improves Plant Growth in Cinnamomum migao Seedlings

( Xiaofeng Liao ),( Jingzhong Chen ),( Ruiting Guan ),( Jiming Liu ),( Qinwen Sun ) 한국균학회 2021 Mycobiology Vol.49 No.4

Cinnamomum migao plants often face different degrees of drought in karst habitats, which can lead to plants’ death, especially in the seedling stage. Widespread of arbuscular mycorrhizal (AM) fungi in karst soils have the potential to address this drought, which is a threat to C. migao seedlings. We inoculated C. migao seedlings with spores from Glomus lamellosum and Glomus etunicatum, two AM fungi widely distributed in karst soils, to observe seedling growth response after simulated drought. Our results showed that 40 g of G. lamellosum and G. etunicatum significantly promoted the growth of C. migao seedlings, 120 days after inoculation. Following a 15-day drought treatment, root colonization of the seedlings with G. lamellosum or G. etunicatum had lower the accumulation of malondialdehyde (MDA) and increased the accumulation of enzymes and osmotic substances in the seedlings. The relative water content in different organs (roots, stems, and leaves) of the drought-stressed seedlings was higher in plants with G. lamellosum or G. etunicatum than in plants without AM fungi colonization. Our results showed that inoculation with AM fungi was an effective means to improve the drought resistance of C. migao seedlings.

Efficacy, safety, and pharmacokinetics of capsid assembly modulator linvencorvir plus standard of care in chronic hepatitis B patients

Jinlin Hou,Edward Gane,Rozalina Balabanska,Wenhong Zhang,Jiming Zhang,Tien Huey Lim,Qing Xie,Chau-Ting Yeh,Sheng-Shun Yang,Xieer Liang,Piyawat Komolmit,Apinya Leerapun,Zenghui Xue,Ethan Chen,Yuchen Zh 대한간학회 2024 Clinical and Molecular Hepatology(대한간학회지) Vol.30 No.2

Background/Aims: Four-week treatment of linvencorvir (RO7049389) was generally safe and well tolerated, and showed anti-viral activity in chronic hepatitis B (CHB) patients. This study evaluated the efficacy, safety, and pharmacokinetics of 48-week treatment with linvencorvir plus standard of care (SoC) in CHB patients. Methods: This was a multicentre, non-randomized, non-controlled, open-label phase 2 study enrolling three cohorts: nucleos(t)ide analogue (NUC)-suppressed patients received linvencorvir plus NUC (Cohort A, n=32); treatment-naïve patients received linvencorvir plus NUC without (Cohort B, n=10) or with (Cohort C, n=30) pegylated interferon-α (Peg-IFN-α). Treatment duration was 48 weeks, followed by NUC alone for 24 weeks. Results: 68 patients completed the study. No patient achieved functional cure (sustained HBsAg loss and unquantifiable HBV DNA). By Week 48, 89% of treatment-naïve patients (10/10 Cohort B; 24/28 Cohort C) reached unquantifiable HBV DNA. Unquantifiable HBV RNA was achieved in 92% of patients with quantifiable baseline HBV RNA (14/15 Cohort A, 8/8 Cohort B, 22/25 Cohort C) at Week 48 along with partially sustained HBV RNA responses in treatment-naïve patients during follow-up period. Pronounced reductions in HBeAg and HBcrAg were observed in treatment-naïve patients, while HBsAg decline was only observed in Cohort C. Most adverse events were grade 1–2, and no linvencorvir-related serious adverse events were reported. Conclusions: 48-week linvencorvir plus SoC was generally safe and well tolerated, and resulted in potent HBV DNA and RNA suppression. However, 48-week linvencorvir plus NUC with or without Peg-IFN did not result in the achievement of functional cure in any patient.