Zobrazeno 1 - 10
of 1 708
pro vyhledávání: '"Yu Qun"'
Publikováno v:
Youqi dizhi yu caishoulu, Vol 31, Iss 5, Pp 199-208 (2024)
Shengli Oilfield has abundant chemical flooding resources. However， the implementation of chemical flooding technologies is difficult due to strong reservoir heterogeneity， high reservoir temperature， high formation water mineralization， high
Externí odkaz:
https://doaj.org/article/a4b194d04da34c71982f50c5c291c49c
Publikováno v:
Liang you shipin ke-ji, Vol 31, Iss 6, Pp 75-83 (2023)
The drying time was decreasedby concentrating T. Fuciformis soup before drying. Effects of removing moisture content (10%~50%) on the quality of the instant T. Fuciformis soup was explored. Compared with the samples without pretreatment, when the wat
Externí odkaz:
https://doaj.org/article/63f76cc8a8494a0da6d72b4e67568cae
Publikováno v:
Gong-kuang zidonghua, Vol 49, Iss 3, Pp 107-114 (2023)
The mine power grid operating environment is poor. When a short circuit fault occurs in the underground power supply system, the use of complex anti-skip trip protection device will reduce the reliability of the entire power grid and increase the cos
Externí odkaz:
https://doaj.org/article/8c731cafaf5547c88d816755f09a2b82
Publikováno v:
Gong-kuang zidonghua, Vol 46, Iss 12, Pp 38-47 (2020)
Although the existing research on mine power grid relay protection setting has studied the setting methods of mine power grid relay protection under different operation modes, but it has not studied the setting method that applied in the automation s
Externí odkaz:
https://doaj.org/article/cea31db5a0334ad5b8ecfa5d087fb7a3
Autor:
YU Qun, SHANG Xueli
Publikováno v:
Gong-kuang zidonghua, Vol 46, Iss 11, Pp 17-22 (2020)
Aiming at problem of low accuracy of line selection when single-phase grounding fault occurs in mine power supply system at present, according to characteristics of obvious difference of zero-sequence current waveform between fault line and non-fault
Externí odkaz:
https://doaj.org/article/8b9289c1f50e4c0d891da5ffbc6ebffc
Publikováno v:
Polish Maritime Research, Vol 27, Iss 1, Pp 116-125 (2020)
In this paper, a numerical code for predicting the hydrodynamic performance of vertical-axis tidal turbine array is developed. The effect of the tip speed ratio, solidity, and preset angle on the hydrodynamic performance are discussed using a series
Externí odkaz:
https://doaj.org/article/4980ae222d924b9b890c395bd251928f
Publikováno v:
Gong-kuang zidonghua, Vol 45, Iss 1, Pp 87-94 (2019)
In order to improve efficiency and energy utilization rate of coal mine microgrid system, optimal configuration model of coal mine microgrid capacity for power generation with coalbed methane was established taking comprehensive net benefit of coal m
Externí odkaz:
https://doaj.org/article/6992c5293b6c451ca8097f6c8133346f
Publikováno v:
Gong-kuang zidonghua, Vol 43, Iss 8, Pp 76-82 (2017)
In view of the problem of ineffective selection of asymmetric mine neutral point ungrounded system while high resistance grounding occurs, a fault phase selection of mine power supply system based on frequency distribution theory was proposed. Each p
Externí odkaz:
https://doaj.org/article/03e928177a4c4a3882883d7b9062ce60
Publikováno v:
Gong-kuang zidonghua, Vol 43, Iss 7, Pp 73-76 (2017)
For high cost, poor sensitivity, complex protection setting calculation existed in current protection methods for shunt capacitor band in mine-used reactive power compensation device, characteristics of capacitor current distribution and fault were a
Externí odkaz:
https://doaj.org/article/e24ed46ebabd40939f129278a28f31ad
Publikováno v:
Gong-kuang zidonghua, Vol 42, Iss 8, Pp 52-55 (2016)
In order to accurately diagnose the fault of circuit breaker according to its condition monitoring data, a fault diagnosis method of circuit breaker based on improved dynamic time warping algorithm was proposed. The method combines Sakoe-Chiba window
Externí odkaz:
https://doaj.org/article/132c8e31e30d4284909b2e0224513fe5