Results 31 to 40 of about 452,078 (267)

Design of novel intrinsically safe power supply with 'ia' grade

Gong-kuang zidonghua, 2017
According to working condition of mine-used power supply in coal mine underground, novel intrinsically safe power supply with 'ia' grade was designed. The power supply uses a fully enclosed AC-DC module to eliminate special flameproof enclosure, and has ...
YU Zhixue, FANG Xupeng, ZHAO Yang
doaj   +1 more source

ГІДРОАКУМУЛЮЮЧІ ЕЛЕКТРОСТАНЦІЇ ЯК ДЖЕРЕЛА РОЗПОДІЛЕНОЇ ГЕНЕРАЦІЇ У СКЛАДІ ПРОМИСЛОВИХ ЕНЕРГОСИСТЕМ

Праці Інституту електродинаміки Національної академії наук України, 2023
The article examines the economic aspects of the efficiency of power systems for mine loads, which include peak pumped-storage hydroelectric power plants that use reservoirs of the mine underground water drainage.
О.Ю. Михайленко, І.О. Сінчук, К.В. Будніков   +2 more
doaj   +1 more source

Eureka and beyond: mining's impact on African urbanisation [PDF]

, 2012
This collection brings separate literatures on mining and urbanisation together at a time when both artisanal and large-scale mining are expanding in many African economies. While much has been written about contestation over land and mineral rights, the
Anderson D.M., Appiah K.A., Bank L., Barnes T.J., Beall J., Bebbington A., Brands H.W., Bridge G., Bridge G., Bryceson D.F., Bryceson D.F., Bryceson D.F., Bryceson D.F., Bryceson D.F., Bryceson D.F., Buijtenhuis R., Carstens P., Cooper F., Coquery-Vidrovitch C., Danny MacKinnon, De Boeck F., De Boeck F., De Boeck F., Deborah Bryceson, Dore E., Duffy R., Emel J., Ferguson J., Freudenberg W.R., Freudenburg W.R., Freund W., Freund W.M., Gluckman M., Godfrey B.J., Grätz T., Harries P., Hilson G., Hilson G., Hilson G., Holliday J.S., Jeeves A., Johnston R.J., Jønsson J.B., Kirk J.F., Laverty J.R., Lawrie M., Le Billon P., Le Billon P., Luning S.W.J., Mabin A., Mabin A., Mkandawire T., Moodie T.D., Morris R.J., Morris R.J., O'Connor A., Parks R., Peters K., Potts D., Rajak D., Rakodi C., Richards P., Ross M., Saad E.N., Smith M.D., Storey K., Swanson M., Tonts M., Vennetier P., Verhoeve A., Walker R.A., Walsh A., Walsh A., Welsby D.A., Werthman K., Wilks I., Wilson L.J., Wolpe H.   +77 more
core   +5 more sources

Design of current sharing system for mine explosion-proof lithium power supply

Gong-kuang zidonghua, 2021
In order to solve the problem of uneven discharge current when multiple mine explosion-proof lithium power supplies are used in parallel, a current sharing system for mine explosion-proof lithium power supply is designed.
LI Qiwei1,2,3, CHEN Wei1,2,3, ZHANG Jian1,2,3, SHAO Tiantian1,2,3   +3 more
doaj   +1 more source

AQ 6201-2017 General Technical Requirements of Coal Mine Safety Monitoring System (draft for approval)

Gong-kuang zidonghua, 2017
The standard stipulates product classification, general requirements, environmental conditions, power supply, system design requirements, basic functions, software functions, main technical indexes, transmission performance, power fluctuation ...
SUN Jiping
doaj   +1 more source

New technologies and new equipments of coal mine monitoring

Gong-kuang zidonghua, 2015
The paper analyzed the national coal production，the total number of accidents, the death rate per million tons and the changes of serious accidents. On average per year, the coal production had increased by 194 million tons, the number of accidents had ...
SUN Jiping
doaj   +1 more source

Research on Key Factors Affecting Power Supply and Demand Trend Based on Complex Correlation [PDF]

E3S Web of Conferences, 2020
The market behaviors of the supply and demand sides in the power market are the issues that market participants, operators and regulators are most concerned about. This article starts from the two dimensions of power generation market behavior and demand
Liu Dunnan, Ge Rui, Li Pengfei, Li Hua, Shi Shanzhe, Li Shilin, Han Jinshan   +6 more
doaj   +1 more source

Research on composite resonator network with onstant—current output for current—fed ICPT systems

Gong-kuang zidonghua, 2018
In order to solve problem of constant current wireless power supply of different sensors used in coal mine safety monitoring and control system, a composite resonator compensation network for wireless power supply were studied based on current—fed ICPT ...
HOU Chun, ZHU Wang, SHUI Hengqi, YU Dongsheng   +3 more
doaj   +1 more source

Design of quasi-resonant flyback secondary intrinsically safe power supply [PDF]

Archives of Electrical Engineering, 2019
In order to improve the efficiency and ensure the security of power supply used in a mine, this paper mainly studies the quasi-resonant flyback secondary power supply and analyzes its operational principles based on the requirements of soft-switching ...
Shengnan Lu, Bin Wang
doaj   +1 more source

Wind-induced vibration piezoelectric energy harvesting technology in underground mine

Meikuang Anquan, 2021
The paper presents a scheme of collecting piezoelectric energy for underground wind-induced vibration to provide self power supply for wireless low power sensor in mine. The technology of underground wind-induced vibration piezoelectric energy collection
ZHOU Daiyong
doaj   +1 more source