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To investigate the conventional magnetic resonance imaging (MRI) and diffusion-weighted imaging (DWI) findings of prostatic abscess (PA) and seminal vesicle abscess (SVA), and to evaluate the qualitative and quantitative diagnostic value of apparent diffusion coefficient (ADC) for these conditions.Ten patients with PA and 2 patients with SVA who underwent MRI and DWI examinations (b = 0 and 1000 s/mm...
Objectives The purpose of this study was to investigate the use of MRI in predicting prostate growth and development. Methods A total of 1,500 healthy male volunteers who underwent MRI of the pelvis were included in this prospective study. Subjects were divided into five groups according to age (group A, 2–5 years; group B, 6–10 years; group C, 11-15 years; group D, 16-20 years; group E, 21-25 years)...
Metal Oxide Surge Arresters (MOSA) degrade in service under the working voltage, on-line measurement of the resistive current of MOSA is an effective method for judging the status of MOSA. In general, the measurement principle of the known detector doesn't consider the effect of the stray capacitance. In this paper based on a known non-liner v-ir mathematical model of the metal oxide valve element,...
A method of reliability evaluation for complex medium-voltage distribution system based on feeder partition model and the minimal path method is proposed in this paper. According to the topology of distribution system, a distribution network is divided into different zones, and then the distribution network is changed into an oriented diagram. Applying the minimal path method, this diagram is divided...
The paper discusses the characteristic of single phase fault in Petersen-coil-grounded distribution grid, analyzes the zero sequence voltage and currents of the Petersen-coil, fault point, fault feeder and sound feeders. Adaptive Petersen-coil is applied to help detecting and extinguishing the single earth fault. And the paper studies characteristic of the derivatives of the zero sequence currents...
Based on harmonics analysis, a technique of the resistive leakage current of the surge arrester is presented in this paper. From an electrical field transducer installed at the grounding line of surge arrester of the phase B, the phase angle information of the operation voltage can be gathered; from the current transducer around the grounding line of surge arrester, the general current signal is able...
A method of reliability evaluation for complex medium-voltage distribution system based on simplified network model and network-equivalent is proposed in this paper. According to the topology of distribution system and the function of the protection device and the switch, a distribution network is divided into different zones, the distribution network based on electrical components is changed into...
A method of reliability evaluation for complex medium-voltage distribution system based on simplified network model and network-equivalent is proposed in this paper. According to the topology of distribution system and the function of the protection device and the switch, a distribution network is divided into different zones, the distribution network based on electrical components is changed into...
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