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您的检索式：作者名="Judong Chen"
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| 1 | Propagation and localisation of partial discharge in transformer bushing based on ultra-high frequency technique显示文摘As an essential component of power transformers,the detection and diagnosis of incipient partial discharge(PD)activities of bushings are of great significance.A 35-kV oil-impregnated paper(OIP)bushing is investigated.The bushing is modelled by coaxial theory and electromagnetic(EM)simulation.As the paths of PD-induced ultra-high frequency(UHF)signal propagating in the bushing are OIPs and oil gap,small attenuation during signal propagation is seen.Since OIP is composed of het-erogeneous media compared with pure oil,there will be relatively less UHF signal leakage from OIPs,whereas more leakage from the oil gap.This leakage provides the possibility of non-contact detection outside the bushing by UHF method.PD mea-surements with UHF method are carried out on the bushing.Then,the minimum energy method is used to extract time-difference-of-arrival(TDOA),and Chan al-gorithm is adopted to locate points of UHF signal radiation.High accuracy locating with a small error of 15 cm has been achieved.The contactless UHF method-based tests have demonstrated the effectiveness of online monitoring and locating of bushing PD. | Jun Jiang Judong Chen Jiansheng Li Xiaoping Yang Ricardo Albarracín-Sánchez Prem Ranjan Chaohai Zhang | 2021 | High Voltage2021，6，4： | 1 |
| 2 | Pancreatic head cancer with gastrointestinal bleeding as the initial manifestation:a case report and literature review显示文摘Gastrointestinal bleeding(GIB)as the initial symptom is rare in patients with pancreatic cancer,which is prone to misdiagnosis and should be paid attention to by clinicians.Here,we present a patient with pancreatic head cancer whose first symptom was only severe upper gastrointestinal bleeding,which initially led to misdiagnosis.However,subsequent imaging revealed a mass in the pancreatic head which was considered a malignant tumor.After surgical resection,the pathology confirmed that the mass in the pancreatic head was pancreatic ductal adenocarcinoma,and the duodenal bulb’s full thickness was infiltrated.A literature review found that pancreatic cancer can present gastrointestinal bleeding by invading the digestive tract and blood vessels,left-sided portal hypertension(LSPH),digestive tract metastasis,and canceration of ectopic pancreatic tissue in the digestive tract.For these cases,clinicians should utilize multidisciplinary diagnosis and treatment based on digestive endoscopy,imaging,interventional therapy,and surgery to control bleeding,identify etiology,and remove tumors. | Minghui Zheng Zhiping Fu Ting Niu Anan Liu Danlei Chen Junfeng Peng Judong Li Zhiyuan Hao Qingyang Yu Zechao Lyu Chenghao Shao | 2023 | Journal of Pancreatology2023，6，3： | 0 |
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