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- 저자 : ( Jianping Qi ) (검색결과 4 건)
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Power Cable Ampacity and Influential Factors Analysis under Operation
Tong, Qiang,Qi, Jianping,Wang, Yanling,Liang, Likai,Meng, Xiangxing,Zhang, Qiang Korea Information Processing Society 2018 Journal of information processing systems Vol.14 No.5
With the increasing of urban electricity demand, making the most use of the power cable carrying capacity has become an important task in power grid system. Contrary to the rated ampacity obtained under extremely conservative conditions, this paper presents the various steady value of cable ampacity by using the changing surrounding parameters under operation, which is based on cable ampacity calculation equation under the IEC-60287 standard. To some degree, the cable ampacity analysis of actual surroundings improves the transmission capacity of cables. This paper reveals the factors that influence cable ampacity such as insulating layer thickness, allowable long-term conductor temperature, the ambient temperature, soil thermal resistance coefficient, and so on, then gives the class of the influence of these parameters on the ampacity, which plays a great role in accurately calculating the real-time ampacity and improving the utilization rate of cable in the complex external environment condition. Furthermore, the transient thermal rating of the cable is analyzed in this paper, and temperature variation of the conductor under different overload conditions is discussed, which provides effective information for the operation and control of the system.
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Power Cable Ampacity and Influential Factors Analysis under Operation
( Qiang Tong ),( Jianping Qi ),( Yanling Wang ),( Likai Liang ),( Xiangxing Meng ),( Qiang Zhang ) 한국정보처리학회 2018 Journal of information processing systems Vol.14 No.5
With the increasing of urban electricity demand, making the most use of the power cable carrying capacity has become an important task in power grid system. Contrary to the rated ampacity obtained under extremely conservative conditions, this paper presents the various steady value of cable ampacity by using the changing surrounding parameters under operation, which is based on cable ampacity calculation equation under the IEC-60287 standard. To some degree, the cable ampacity analysis of actual surroundings improves the transmission capacity of cables. This paper reveals the factors that influence cable ampacity such as insulating layer thickness, allowable long-term conductor temperature, the ambient temperature, soil thermal resistance coefficient, and so on, then gives the class of the influence of these parameters on the ampacity, which plays a great role in accurately calculating the real-time ampacity and improving the utilization rate of cable in the complex external environment condition. Furthermore, the transient thermal rating of the cable is analyzed in this paper, and temperature variation of the conductor under different overload conditions is discussed, which provides effective information for the operation and control of the system.
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Management of Primary Hepatic Tuberculosis: A Single Center Experience
( Xin Long ),( Lei Zhang ),( Jianping Zhao ),( Qi Cheng ),( Peng Zhu ),( Zhu Chen ),( Zhiyong Huang ),( Xiaoping Chen ) 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Aims: Primary hepatic tuberculosis is a rare benign disease, without typical manifestation and specific test, which usually contribute to the misdiagnosis of the disease. Therefore, we reviewed eleven cases of primary hepatic tuberculosis in our medical center, in order to find the common features, which might be conductive to improve the diagnostic accuracy of the disease. Methods: Eleven cases of hepatic tuberculosis confirmed by histopathological examination from 2012 to 2017, were collected in our hospital. Clinical features and outcomes were retrospectively analyzed. Results: All the patients were in good condition at admission, including seven male and four female, aging from 18 to 66 years (average 42.7 years). They disclaimed history of pulmonary and any extra-pulmonary tuberculosis. Tumor markers including AFP, CA19-9 and CEA were within the normal range. All the patients, with liver function classified as Child Pugh A, showed no signs of infection. The lesions were presented as hypo-echoic, cystic or solid-cystic in ultrasonography, low density with periphery enhancement on CT scan, and mixed signals on MRI. Two patients were initially diagnosed as liver cancer, two as liver benign tumor, three as hilar tumor, two as liver abscess, and one as others. Five cases underwent partial hepatectomy, two received laparotomy and drainage of the abscess, two experienced laparotomy and liver biopsy, and two with percutaneous needle biopsy. All recovered well after the operation, subsequently received regular treatment of anti-tuberculosis, and completely cured for hepatic tuberculosis. Conclusions: Surgical intervention is an effective way to clarify the diagnosis of asymptomatic primary hepatic tuberculosis.
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Zhang Xiaoyang,Xiong Si-Yi,Wu Xiukun,Zeng Bei-Bei,Mo Yang-Mei,Deng Zhi-Cheng,Wei Qi,Gao Yang,Cui Licao,Liu Jianping,Long Haozhi 한국미생물학회 2023 The journal of microbiology Vol.61 No.11
Establishing slash pine plantations is the primary method for restoring sandification land in the Houtian area of South China. However, the microbial variation pattern with increasing stand age remains unclear. In this study, we investigated microbial community structure and function in bare sandy land and four stand age gradients, exploring ecological processes that determine their assembly. We did not observe a significant increase in the absolute abundance of bacteria or fungi with stand age. Bacterial communities were dominated by Chloroflexi, Actinobacteria, Proteobacteria, and Acidobacteria; the relative abundance of Chloroflexi significantly declined while Proteobacteria and Acidobacteria significantly increased with stand age. Fungal communities showed succession at the genus level, with Pisolithus most abundant in soils of younger stands (1- and 6-year-old). Turnover of fungal communities was primarily driven by stochastic processes; both deterministic and stochastic processes influenced the assembly of bacterial communities, with the relative importance of stochastic processes gradually increasing with stand age. Bacterial and fungal communities showed the strongest correlation with the diameter at breast height, followed by soil available phosphorus and water content. Notably, there was a significant increase in the relative abundance of functional groups involved in nitrogen fixation and uptake as stand age increased. Overall, this study highlights the important effects of slash pine stand age on microbial communities in sandy lands and suggests attention to the nitrogen and phosphorus requirements of slash pine plantations in the later stages of sandy management.
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