Results 51 to 60 of about 7,244 (206)
Invention Into the AC Voltage Regulator with V/F Technique for Induction Motor Starting Applications [PDF]
Modern electrical motors are available in many different forms with different mounting arrangements. To ensure a long life for the motor it is important to select it with correct degree of protection when operating under heavy duty conditions in a severe
Kollipara, M. (Mahesh) +1 more
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Through shear–tensile creep tests and viscoelastic modeling, the fracture evolution of thick soft protective layers is clarified. Results show thickness‐dependent rheological failure modes that govern four types of roof water inrush, providing a mechanism‐based framework for hazard prediction and control. Abstract In the Jurassic coal‐bearing strata of
Mengnan Liu +4 more
wiley +1 more source
Protection, interlocks and diagnostics [PDF]
When designing any power converter it is essential to assess and incorporate adequate protection. The main objective is to offer a solution which is safe, reliable and repairable and that achieves its specification within budget.
Charnley, G +3 more
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The fused data extracted from the distributed monitoring system as the data basis, combined with dynamic geological data, are imported into a deep learning model. As the geological conditions of mining and excavation change, the risk of water inrush at the working face is retrieved in real time.
Yongjie Li +4 more
wiley +1 more source
Due to the wide distribution, large quantity, strong invisibility and difficult detection, the activated water inrush of buried fault on the bottom strata has become one of the main forms of deep mining water inrush.
ZHANG Yujun +4 more
doaj +1 more source
ダンラクリュウ ノ ゲンセイ ニカンスル キソテキ ケンキュウ [PDF]
【摘要】 静水池水叩きの長さ節減を計るため段落水脈裏面における圧力を変化させ,あるいは無気層状態として実験を行った.研究の成果を列記すると次の通りである.1)段落水脈裏面が通気あるいは無通気の場合,落チ口水深,限界水深,落チ口より上流限界水深が生ずる地点までの距離との関係を明らかにした.2)段落水脈の軌跡を,段落水脈裏面が正圧,負圧,大気圧の場合について実験的に求めた.流量係数,突込み角,水平到達距離は段落水脈の圧力変化により変りその変化の度合を示した.3)波状流は水路にとって浸蝕の大きな要因であり ...
前川 勝朗
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This study reveals the temporal and spatial evolution law of roof separation under the karst aquifer and the dynamic water inrush mechanism of roof separation. The FAHP–EWM–CRITIC combination weighting method was established to obtain the risk zoning of bed separation water inrush in a karst landform mining area. ABSTRACT Coalfields in northern Guizhou
Xilong Zhu +5 more
wiley +1 more source
60 years of investigation on water inrush coefficient: Challenges faced and development directions
Since the birth of the water inrush coefficient in 1964, in spite of it has undergone many improvements and changes in the past 60 years, its main body has always been the main method for predicting and evaluating the danger of bottom water inrush in my ...
Shangxian YIN +8 more
doaj +1 more source
In order to control the water inrush of Ⅲ638 working face floor verification borehole in Zhuzhuang Coal Mine, we first analyzed the reasons of the water inrush, and confirmed that the inrush water source was L3 limestone water, and the water channel was ...
LI Zhi, ZHENG Shitian, WANG Yuhang
doaj +1 more source
A practitioners guide to managing geoscience information [PDF]
In the UK the Natural Environment Research Council manages its scientific data holdings through a series of Environmental Data Centres1 Within the Earth Science sector the National Geoscience Data Centre covering Atmosphere, Bioinformatics, Earth ...
Giles, Jeremy
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