Results 81 to 90 of about 2,129 (172)

0.345 Attenuation Law of Vibration Signals During Caving [PDF]

, 2014
To study on the characteristics of the vibration signals of coal and stone hitting the armor plate during caving, a hybrid algorithm based on first order forward difference and wavelet transform modulus-maxima method is presented which can be used in the
Gu, Tao, Li, Xu
core   +1 more source

SIMULTANA EVALUACIJA KRITERIJA I ALTERNATIVA ZA ODABIR METODE EKSPLOATACIJE (STUDIJE SLUČAJA: ŽELJEZNA RUDA GOL-E-GOHAR BR. 3 I BAKRENA RUDA CHAHAR-GONBAD) [PDF]

Selecting a mining method is an essential step in the initial phases of mining. The selection of an inappropriate mining method can have consequences, such as the potential loss of a portion of the ore deposit.
Amou, Abbas, Namin, Farhad Samimi
core   +2 more sources

A research study of lightweight state perception algorithm based on improved YOLOv5s‐Tiny for fully mechanized top‐coal caving mining

Energy Science & Engineering
Real‐time monitoring of the coal caving process in fully mechanized mining is crucial for achieving intelligent and efficient top‐coal caving. While the coal gangue identification method, employing vision and deep learning, has advanced in the realm of ...
PengFei Shan, Tong Yang, XiaoChen Wu, HaoQiang Sun   +3 more
doaj   +1 more source

Impact of surface irregularities on coal wall stability and support mechanisms: Insights from physical and numerical experiments

International Journal of Mining Science and Technology
Coal wall stability is a critical factor influencing coal mining efficiency and threatens the safety of working faces, where irregular coal wall surfaces significantly affect the contact and support effectiveness of the support plate, thereby impacting ...
Jiachen Wang, Xiang Yu, Zhong Huang, Lianghui Li, Yubing Wang   +4 more
doaj   +1 more source

Ecosystem services provided by spiders

Biological Reviews, Volume 100, Issue 6, Page 2217-2236, December 2025.
ABSTRACT Spiders, ubiquitous and abundant predators in terrestrial ecosystems, often are the subjects of an unjust negative perception. However, these remarkable creatures stand as unsung heroes within our ecosystems, contributing a multitude of ecosystem services critical to human well‐being.
Pedro Cardoso, Stano Pekár, Klaus Birkhofer, Angela Chuang, Caroline Sayuri Fukushima, Eileen A. Hebets, Yann Henaut, Thomas Hesselberg, Jagoba Malumbres‐Olarte, Ondřej Michálek, Radek Michalko, Catherine Scott, Jonas Wolff, Stefano Mammola   +13 more
wiley   +1 more source

Language of advertising [PDF]

, 1928
This item was digitized by the Internet Archive.
Bunker, Howard Q.
core   +1 more source

Int J Rock Mech Min Sci (1997) [PDF]

Longwall mining of coal seams affects a large area of overburden by deforming it and creating stress-relief fractures, as well as bedding plane separations, as the mining face progresses.

core  

Analysis on the Effect of Slideway Friction to the Slider-Type Hydraulic Powered Support [PDF]

, 2019
This paper presents a design concept of the slider-type hydraulic powered support. The equivalent mechanical model is established when the hydraulic powered support supporting the stable roof pressure and deriving the numerical calculation formula of the
Lirong Wan, Peng Liu, Qingliang Zeng*, Yang Yang   +3 more
core   +2 more sources

Prediction of rock mixed ratio in image-based intelligent control of caving door in longwall top coal caving face part Ⅱ: inside rock mixed ratio of coal flow

Meitan xuebao
The main task of image-based intelligent control of caving door in longwall top coal caving face is to monitor the rock mixed ratio of coal flow by analyzing the image, and then determine the closing time of caving door.
Jiachen WANG, Shengli YANG, Lianghui LI, Xin ZHANG, Yongsheng CHEN, Dongxin HOU   +5 more
doaj   +1 more source

Communication Mechanism and Algorithm of Composite Location Analysis of Emergency Communication based on Rail [PDF]

, 2018
The emergency communication system based on rail is an unconventional emergency communication mode, it is a complement equipment for that conventional communication system can’t work while tunnel mine accident occurs.
Meixia Duan, Xiaolin Zhong, Yong Guo, Yong Jiang   +3 more
core   +2 more sources