Development Status and Key Technologies of Unmanned and New Energy Trucks in Open-pit Coal Mines in China

2021 ◽  
2021 ◽  
Author(s):  
liu xinjie ◽  
Li Lianghui ◽  
Yang yingming

Abstract As a controllable active resource in China, coal mining is facing the transition from output to quality. Base d on the total mining production and average capacity, the current situation and level of coal mining at three scales of mine, city and province is analyzed , data support for the layout of sustainable mining development and the optimization of output is provided. The results show that China's coal is mainly mined by underground mining, accounting for 87%, with an average production capacity of 0.93 million tons. Open pit mining accounts for 13%, with an average production capacity of 5.73 million ton s. S o t he average production capacity of open pit and underground workers is 1.045 million tons, with 1,181 coal mines capacity lower than 0.3 million tons, accounting for 35% of the total coal mines, contributing only 4% to their output. They are distributed in about 48 cities in 6 provinces, seriously restricting the green coal mining. The coal industry should speed up the reduction of small coal mines in key provinces and cities, eliminate outdated product ion capacity in the central region, increase the speed and proportion of coal resources moving westward, and promote high quality development of coal mining.


2017 ◽  
Vol 12 ◽  
pp. 96-108
Author(s):  
E.L. Karibzhanova ◽  
◽  
A.E. Safronov ◽  
O.O. Skryabin ◽  
V.V. Semenyaka ◽  
...  

2021 ◽  
Vol 1 (1) ◽  
pp. 10-15
Author(s):  
Sijin Ma ◽  
Jiahao Mai ◽  
Wanling Wang ◽  
Kemeng Yao ◽  
Deyu Li

Under the background of energy conservation and emission reduction advocated by the state, the sales volume of new energy vehicles increased rapidly and reached new highs in 2021. However, many domestic new energy vehicles still face the problems of serious homogenization and low market share. In view of this situation, we mine and capture the data of online consumers and potential consumers, analyze consumers' preferences in combination with the knowledge learned, take Shenzhen BYD Co., Ltd. as an example, analyze its competitive environment, and finally put forward feasible suggestions.


2017 ◽  
Vol 12 (2) ◽  
pp. 113-122 ◽  
Author(s):  
Mark KORYAGIN ◽  
Artyom VORONOV
Keyword(s):  

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
Le VAN CANH ◽  
Cao XUAN CUONG ◽  
Nguyen QUOC LONG ◽  
Le THI THU HA ◽  
Tran TRUNG ANH ◽  
...  

Open-pit coal mines’ terrain is often complex and quickly and frequently changes. Therefore, topographic surveys of open-pit mines are undertaken on a daily basis. While these tasks are very time-consuming and costly with traditional methods such as total station and GNSS, the unmanned aerial vehicle (UAV) based method can be more efficient. This method is a combination of the “Structure from motion” (SfM) photogrammetry technique and UAV photogrammetry which has been widely used in topographic surveying. With an increasing popularity of RTK-enabled drones, it is becoming even more powerful method. While the important role of ground control points (GCP) in the accuracy of digital surface model (DSM) generated from images acquired by “traditional” UAVs (not RTK-enabled drones) has been proved in many previous studies, it is not clear in the case of RTK-enabled drones, especially for complex terrain in open-pit coal mines. In this study, we experimentally investigated the influence of GCP regarding its numbers and distribution on the accuracy of DSM generation from images acquired by RTK-enabled drones in open-pit coal mines. In addition, the Post Processing Kinematic (PPK) mode was executed over a test field with the same flight altitude. DSM generation was performed with several block control configurations: PPK only, PPK with one GCP, and PPK with two GCPs. Several positions of GCPs were also examined to test the optimal locations for placing GCPs to achieve accurate DSMs. The results show that the horizontal and vertical accuracy given by PPK only were 9.3 and 84.4 cm, respectively. However, when adding at least one GCP, the accuracy was significantly improved in both horizontal and vertical components, with RMSE for XY and Z ranging between 3.8 and 9.8 cm (with one GCP) and between 3.0 and 5.7 cm (with two GCPs), respectively. Also, the GCPs placed in the deep areas of the open-pit mine could ensure the cm-level accuracy.


Author(s):  
Zoran Marković ◽  
Miloš Milivojević ◽  
Bruijn De ◽  
Wilma Wessels ◽  
De Van ◽  
...  

2016 ◽  
Vol 94 ◽  
pp. 638-646 ◽  
Author(s):  
Huang Lei ◽  
Zhang Peng ◽  
Hu Yigang ◽  
Zhao Yang

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