A Novel Distributed Equivalent Circuit Model for Single-Core Cables

Li Rui-Fang,Hu Hao,Cao Xiao-Bin,Li Zhong-Mei,Li Jun-Hao,Zhu Chuan-Lin,Liu Le-Jia 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1

The number of cables used for urban power supply increases rapidly. The sheath current in these cables, which is generated via induction, produces a current loss. When the situation is serious, the ground lead and the middle connector of the cable will be burned. In this paper, the existing single-core cable equivalent circuit model is used to calculate the sheath current of a 3-phase cable under the condition of non-transposition and cross connection. By comparing the calculated results with the simulation and the experimental results, it is found that the current distribution law for the sheath, which was obtained using the existing model, difers substantially from both the simulation and actual measurements. The error reason of the existing model is revealed, and it is found that the magnitude and phase of the current in the metal sheath of the cable varies with the position under the combined efect of distributed capacitances in the cable and the core-current fux, especially for a 3-phase cross connection, each section of the cable does not meet Kirchhof’s laws, but the sheath electric current in the existing models are considered equal everywhere. Therefore, a novel cable equivalent model is proposed in this paper, which is based on a distributed circuit, and an equation to calculate the sheath current is derived. The model presented in this paper corrects the problems of the existing model, which can be applied to power system, subway, high-speed rail, and any application of single-core cables.

Study on Enhancing Lightning Protection Scheme of Catenary in Subway Viaduct Section

Rui-Fang Li,Kui Chen,Li-Sheng Chen,Xiao-Bin Cao,Guang-Ning Wu,Xue-Qin Zhang 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.2

Viaduct increases the height of subway catenary, namely magnifies lightning attraction scope that lead to higher possibility of suffering lightning stroke. Therefore, it is necessary to analyze performance of lightning striking to catenary of subway in viaduct section and propose an improving lightning protection scheme. In this paper, using ATP-EMTP simulation software to establish an associated model to evaluate lightning withstand level of catenary with existing lightning protection schemes including arrester and grounding point, an improving lightning protection scheme is proposed — every pillar ground earth and arresters are installed with some installing spacing between 200m to 400m based on lightning damage degree and reliability requirements — according to analyzing results: while lightning withstand level is lowest for lightning striking to the neutral pillar, lightning withstand level is greatest for lightning striking to the both-ends pillar that arrester and grounding point are both installed; grounding point could obviously improve lightning withstand level for lightning striking to ground wire while arrester could obviously improve the lightning withstand level for lightning striking to catenary; every pillar ground earth could enhance the lowest lightning withstanding level up to 2.5 times than of that pillar ground earth across every 200m.

Study on Enhancing Lightning Protection Scheme of Catenary in Subway Viaduct Section

Li, Rui-Fang,Chen, Kui,Chen, Li-Sheng,Cao, Xiao-Bin,Wu, Guang-Ning,Zhang, Xue-Qin The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.2

Viaduct increases the height of subway catenary, namely magnifies lightning attraction scope that lead to higher possibility of suffering lightning stroke. Therefore, it is necessary to analyze performance of lightning striking to catenary of subway in viaduct section and propose an improving lightning protection scheme. In this paper, using ATP-EMTP simulation software to establish an associated model to evaluate lightning withstand level of catenary with existing lightning protection schemes including arrester and grounding point, an improving lightning protection scheme is proposed - every pillar ground earth and arresters are installed with some installing spacing between 200m to 400m based on lightning damage degree and reliability requirements - according to analyzing results: while lightning withstand level is lowest for lightning striking to the neutral pillar, lightning withstand level is greatest for lightning striking to the both-ends pillar that arrester and grounding point are both installed; grounding point could obviously improve lightning withstand level for lightning striking to ground wire while arrester could obviously improve the lightning withstand level for lightning striking to catenary; every pillar ground earth could enhance the lowest lightning withstanding level up to 2.5 times than of that pillar ground earth across every 200m.

Highly synergic adsorption and photocatalytic degradation of walnut shell biochar/NiCr-layered double hydroxides composite for Methyl orange

Xiao-fang Li,Rui-xian Li,Ke-xin Wang,Xiao-qiang Feng 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-

Methyl orange (MO) is a kind of azo dye, and will do great harm to the ecological environment. Alleviating this problem by removing MO is crucial role to prevent harmful damage to the environment. In this paper, NiCr layered double hydroxides (LDH) were prepared through hydrothermal method andthen modified with different mass rations of walnut shell biochar. The structure and properties ofbiochar/NiCr-LDH composites were analyzed by Fourier transform infrared spectroscopy (FT-IR), powderX-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) coupled with energy dispersespectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). Moreover, the adsorption andphotocatalytic degradation behavior of composites on anionic dye MO were investigated. Characterization results indicated that NiCr-LDH was perfectly synthesized and coated on the biochar. All the biochar/NiCr-LDH composites show enhanced adsorption and photodegradation performancefor MO dye compared with pure NiCr-LDH and biochar. When the biochar content was 22.3 wt.% andthe biochar/NiCr-LDH (S2) dosage was 1.0 mg/mL, the maximum removal amount of MO could reach100 % within 60 min at the natural pH, experimental data fitted well with the pseudo-second-orderkinetic and Freundlich isotherm model, and the maximum adsorption capacity of S2 was 108.2 mg/g. Besides, compared with NiCr-LDH, S2 also demonstrated wonderful photodegradation activity for MOunder visible-light irradiation, the rate constant of S2 (0.0173 min1) is about 1.5 times that of NiCr-LDH (0.0118 min1), and the enhanced performance can be due to the faster separation of electronholepairs, in which biochar acted as charge separation carriers. Meanwhile, the hydroxyl radical andsuperoxide radical played crucial roles in the dye photocatalytic degradation, and a possible photocatalyticdegradation mechanism was proposed. The excellent photocatalytic activity and stability makebiochar/NiCr-LDH an ideal photocatalyst to solve environmental crisis.

Association Study of Polymorphisms in Neuronal Nicotinic Acetylcholine Receptor Subunit Genes With Schizophrenia in the Han Chinese Population

Yuan-yuan Li,Rui-jie Geng,Shun-ying Yu,Guan-jun Li,Zhou-ye Wang,Hua-fang Li 대한신경정신의학회 2021 PSYCHIATRY INVESTIGATION Vol.18 No.10

Objective To investigate the relation between nicotinic acetylcholine receptor subunit (nAChR) genes and schizophrenia, and the relation between tag single nucleotide polymorphism (rs1317286, rs1044396, rs6494212, rs16969968, and rs684513) and schizophrenia in Han Chinese people. Methods The protein-protein interaction (PPI) network among nAChR protein and 350 proteins encoded by schizophrenia-related susceptibility genes was constructed through the String database to explore whether nAChR genes were associated with schizophrenia in these known databases. Then, five single nucleotide polymorphisms (SNPs) of CHRNA3 (rs1317286), CHRNA4 (rs1044396), CHRNA7 (rs6494212), and CHRNA5 (rs16969968, rs684513) were analyzed in a sample of 1,035 schizophrenic patients and 816 healthy controls. The interaction between the markers was analyzed using multifactor dimensionality reduction (MDR) software. Power analysis was performed using the Quanto program. Results There are no significant differences in genotype or allele distribution were identified between the patients and controls (p>0.05). The haplotypes constructed by four markers rs1317286, rs6494212, rs16969968, and rs684513 were not associated with schizophrenia either. However, a significant association between models made of rs1317286, rs1044396, rs6494212, and rs684513 and schizophrenia was revealed in interaction analysis (p<0.05). Conclusion The nAChR protein may have effects on the development of schizophrenia through the interaction with proteins encoded by schizophrenia-related susceptibility genes, but no relation was found between selected polymorphisms and schizophrenia in the collected Han Chinese people. However, interaction analysis suggested four-SNP model has an important effect on schizophrenia.

Preparation and Property Characterization of Silver-plated Yarn Heating Fabric with Nano Ceramic Power/Waterborne Polyurethane Film

Rui Wang,Yue Li,Shu Fang,Hao Liu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.12

In recent years, due to the continuous change of global climate, extreme cold waves are more frequent and intense,electric heating fabric for its clean and environmental protection, high heating efficiency and adjustable temperature has beenwidely concerned. In this paper, the heating temperature, thermal uniformity and power of silver-plated yarn heating fabric(SPYHF) with different circuit design and line spacing were studied. The waterborne polyurethane film doped with nanoceramic powder was prepared to prevent the silver-plated yarn (SPY) from being vulcanized and improve the washingresistance of heating fabric. When the ambient temperature was 20 °C, the heating temperature and thermal uniformity at 5 Vof heating fabric with nano ceramic powder/waterborne polyurethane film were 64.466 °C and 13.574 %. The filmeffectively reduced the power consumption of heating fabric at low temperature. The experimental results provided somehelp for the preparation of electric heating fabric.

MicroRNA-328 Inhibits Proliferation of Human Melanoma Cells by Targeting TGFB2

Li, Jing-Rong,Wang, Jian-Qin,Gong, Qing,Fang, Rui-Hua,Guo, Yun-Long Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.4

Some microRNAs (miRNAs) have been shown to act as oncogenes or tumor suppressor genes in human melanomas. miR-328 is upregulated in blood cells of melanoma patients compared to in healthy controls. This suggests a role for miR-328 in melanoma that warrants investigation. In this study, we demonstrated miR-328 levels to be dramatically decreased in human melanoma cell lines. Moreover, forced expression of miR-328 inhibited proliferation and induced G1-phase arrest of the SK-MEL-1 melanoma cell line. We identified TGFB2 as a direct target gene for miR-328 using a fluorescent reporter assay and western blotting. Levels of TGFB2 were dramatically increased in human melanoma cell lines and were inversely correlated with the miR-328 expression level. Our findings provide new insights into the mechanisms of human melanoma development, indicating that miR-328 has therapeutic potential for this disease.

Prospective comparison of hybrid capture 2 and SPF10-LiPA for carcinogenic human papillomavirus detection and risk prediction of cervical cancer: a population-based cohort study in China

Li Dong,Rui-Mei Feng,Li Zhang,Xiao-qian Xu,Xue-Lian Zhao,Margaret Zhuoer Wang,You-Lin Qiao,Fang-Hui Zhao 대한부인종양학회 2017 Journal of Gynecologic Oncology Vol.28 No.5

Objective: To investigate the extent of the cross-reactivity of hybrid capture 2 (HC2) assay andevaluate the potential effect of cross-reactivity on the long-term risk for cervical cancer andprecancers. Methods: Based on the Shanxi Province Cervical Cancer Screening Study-I (SPOCCS-I)cohort from 2005 to 2014 in Shanxi, China, SPF10-line probe assay (LiPA) was performedin all 598 HC2 positive and 300 random-selected HC2 negative cervical specimens. Tenyearcumulative incidence rate (CIR) of cervical intraepithelial neoplasia grade 2 or worse(CIN2+) of these two tests was evaluated using Kaplan-Meier methods. Possible humanpapillomavirus (HPV) types to be cross-reacted by HC2 were also analyzed. Results: The overall agreement between HC2 and SPF10-LiPA for detecting carcinogenic HPVwas 73.27%. The highest 10-year cumulative risk of CIN2+ was observed in both HC2 positiveand LiPA-carcinogenic HPV positive women (25.70%; 95% confidence interval [CI]=23.55%–27.91%), followed by HC2 positive but LiPA-non-carcinogenic HPV positive women (9.97%;95% CI=8.57%–11.50%), HC2 negative but LiPA-carcinogenic HPV positive (2.56%; 95%CI=2.44%–2.70%) and HC2 positive but LiPA-HPV negative (1.85%; 95% CI=1.78%–1.92%)women. The proportion of cross-reactivity of HC2 with untargeted carcinogenic types was8.9%, most of which were attributable to HPV26, 73, 82, 69, 71, 53, 11, 43, and 54. Conclusion: The noticeable high risk of CIN2+ in women infected with cross-reacted noncarcinogenicHPV and low risk in those with miss-to-detective carcinogenic HPV supportedan overall good clinical performance of HC2 for a general cervical cancer screening.

Gut Microbiota Community and Its Assembly Associated with Age and Diet in Chinese Centenarians

( Fang Wang ),( Ting Yu ),( Guo Hong Huang ),( Da Cai ),( Xiaolin Liang ),( Hai Yan Su ),( Zhenjun Zhu ),( Danlei Li ),( Yang Yang ),( Pei Hong Shen ),( Rui Feng Mao ),( Lian Yu ),( Mou Ming Zhao ),( 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.8

Increasing evidence suggests that gut microbiota underpin the development of health and longevity. However, our understanding of what influences the composition of this community of the longevous has not been adequately described. Therefore, illumina sequencing analysis was performed on the gut microbiota of centenarians (aged 100-108 years; RC) and younger elderlies (aged 85-99 years; RE) living in Bama County, Guangxi, China and the elderlies (aged 80-92 years; CE) living in Nanning City, Guangxi, China. In addition, their diet was monitored using a semiquantitative dietary questionary (FFQ 23). The results revealed the abundance of Roseburia and Escherichia was significantly greater, whereas that of Lactobacillus, Faecalibacterium, Parabacteroides, Butyricimonas, Coprococcus, Megamonas, Mitsuokella, Sutterella, and Akkermansia was significantly less in centenarians at the genus level. Both clustering analysis and UniFraq distance analysis showed structural segregation with age and diet among the three populations. Using partial least square discriminate analysis and redundancy analysis, we identified 33 and 34 operational taxonomic units (OTUs) as key OTUs that were significantly associated with age and diet, respectively. Age-related OTUs were characterized as Ruminococcaceae, Clostridiaceae, and Lachnospiraceae, and the former two were increased in the centenarians; diet-related OTUs were classified as Bacteroidales, Lachnospiraceae, and Ruminococcaceae. The former two were deceased, whereas the later one was increased, in the high-fiber diet. The age and high-fiber diet were concomitant with changes in the gut microbiota of centenarians, suggesting that age and high-fiber diet can establish a new structurally balanced architecture of gut microbiota that may benefit the health of centenarians.

Parkinson’s Disease with Fatigue: Clinical Characteristics and Potential Mechanisms Relevant to α-Synuclein Oligomer

Li-Jun Zuo,Shu-Yang Yu,Fang Wang,Yanghui Xia,Ying-Shan Piao,Yang Du,Teng-Hong Lian,Rui-Dan Wang,Qiu-Jin Yu,Ya-Jie Wang,Xiao-Min Wang,Piu Chan,Sheng-Di Chen,Yongjun Wang,Wei Zhang 대한신경과학회 2016 Journal of Clinical Neurology Vol.12 No.2

Background and Purpose The aim of this study was to identify the clinical characteristics and potential mechanisms relevant to pathological proteins in Parkinson’s disease (PD) patients who experience fatigue. Methods PD patients (n=102) were evaluated using a fatigue severity scale and scales for motor and nonmotor symptoms. The levels of three pathological proteins—α-synuclein oligomer, β-amyloid (Aβ)1-42, and tau—were measured in 102 cerebrospinal fluid (CSF) samples from these PD patients. Linear regression analyses were performed between fatigue score and the CSF levels of the above-listed pathological proteins in PD patients. Results The frequency of fatigue in the PD patients was 62.75%. The fatigue group had worse motor symptoms and anxiety, depression, and autonomic dysfunction. The CSF level of α-synuclein oligomer was higher and that of Aβ1-42 was lower in the fatigue group than in the non-fatigue group. In multiple linear regression analyses, fatigue severity was significantly and positively correlated with the α-synuclein oligomer level in the CSF of PD patients, after adjusting for confounders. Conclusions PD patients experience a high frequency of fatigue. PD patients with fatigue have worse motor and part nonmotor symptoms. Fatigue in PD patients is associated with an increased α-synuclein oligomer level in the CSF