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]

open access: yes, 2015
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
core   +1 more source

Fracture evolution of a thick soft protection layer and the water inrush mechanism in overburden under longwall mining

open access: yesDeep Underground Science and Engineering, EarlyView.
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]

open access: yes, 2006
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
core   +1 more source

Dynamic geo‐hydrogeological monitoring‐driven situational awareness for real‐time floor water inrush risk prediction in deep mining

open access: yesDeep Underground Science and Engineering, EarlyView.
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

Study on mining water inrush mechanism of buried fault under coal seam floor above confined water body

open access: yesMeitan kexue jishu, 2023
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]

open access: yes, 1969
【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
core   +1 more source

Investigation of the Dynamic Evolution Mechanism of Bed Separation in Karst Aquifers and Risk Assessment of Water Inrush

open access: yesEnergy Science &Engineering, EarlyView.
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

open access: yesMeitan xuebao
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

Technology and application of integrated treatment of water source and channel for floor borehole water inrush in Zhuzhuang Coal Mine

open access: yesMeikuang Anquan, 2023
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]

open access: yes, 2009
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
core  

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