Results 61 to 70 of about 16,961 (284)

Thermal Calculations for Co‐Firing of Hydrogen/Ammonia and Coal in 660‐MW Coal‐Fired Boilers

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT To achieve a clean energy transition under the dual carbon goals, blending hydrogen/ammonia into pulverized coal boilers represents a key technological pathway. Different hydrogen/ammonia co‐firing ratios (5%–50%) are investigated for their impact on the thermodynamic characteristics of 660‐MW supercritical boiler at 100% and 20% boiler ...
Yaodong Da, Nana Hou, Weipeng Wang, Yongqiang Chang, Xin Liu, Feng Pan, Defu Che, Lei Deng   +7 more
wiley   +1 more source

Functional morphology of the pharyngeal teeth of the ocean sunfish, Mola mola

The Anatomical Record, EarlyView.
Abstract Many fish use a set of pharyngeal jaws in their throat to aid in prey capture and processing, particularly of large or complex prey. In this study—combining dissection, CT scanning, histology, and performance testing—we demonstrate a novel use of pharyngeal teeth in the ocean sunfish (Mola mola), a species for which pharyngeal jaw anatomy had ...
Benjamin Flaum, Michael J. Blumer, Mason N. Dean, Laura J. Ekstrom   +3 more
wiley   +1 more source

Optimization Analysis of Advanced Support for Thick and Hard Roof

International Journal of Natural Resources and Environmental Studies
Based on the geological conditions of 1033 working face in Yuandian No.1 Coal Mine, this paper studies the support distance and support strength of hydraulic support in the advanced section of roadway roof. Through numerical simulation analysis, the advance support range of the advance roadway is 5m, 10m, 15m, 20m and 25m four kinds of distance plastic
Yongkun Zhang, Kaiwei Wang
openaire   +1 more source

Osteological correlates of the respiratory and vascular systems in the neural canals of Mesozoic ornithurines Ichthyornis and Janavis

The Anatomical Record, EarlyView.
Abstract In birds, the neural canal houses a variety of anatomical structures including the spinal cord, meninges, spinal vasculature, and respiratory diverticula. Among these, paramedullary diverticula and the extradural dorsal spinal vein may leave behind osteological correlates in the form of pneumatic foramina and fossae, and a bilobed geometry of ...
Jessie Atterholt, M. Grace Burton, Mathew J. Wedel, Juan Benito, Ellen Fricano, Daniel J. Field   +5 more
wiley   +1 more source

Mechanism of strong mine pressure in composite hard roofs and identification of the primary control layer

Geomatics, Natural Hazards & Risk
Multilayered hard roofs overlie coal seams, and the instability mechanism of roof structures under combined stress conditions is highly complex. Through integrated approaches including physical similarity simulation, theoretical analysis, and engineering
Hongwei Wang, Jinyuan Bai, Jianqiang Jiao, Yanjun Li   +3 more
doaj   +1 more source

Rock burst prevention technology in multi-roadway intersection area of hard roof strong impact working face

, 2022
In order to ensure the safety of multi-roadway crossing area in the mining process of strong impact working face under hard roof, the end mining of 401111 working face of Shaanxi Binchang Hujiahe Mining Co., Ltd.
XI Guojun, PAN Junfeng, LIU Shaohong, MA Hongyuan, JIAO Biao, WU Jianhong   +5 more
core   +1 more source

Study on Dynamic Disaster Mechanisms of Thick Hard Roof Induced by Hydraulic Fracturing in Surface Vertical Well [PDF]

, 2022
With the increase in mining depth and the deterioration of mining conditions, thick and hard overburden movement frequently induces mine earthquakes and rock bursts.
Xiaoguang Shang, Li, Jiajie, Zhu, Chun, Sitao Zhu, Liu, Jinhai, Hitch, Michael, Zhu, Sitao, Liu, Hongliang, Jinhai Liu, Michael Hitch, Fuxing Jiang, Hongliang Liu, Jiajie Li, Shang, Xiaoguang, Jiang, Fuxing, Tang, Shibin, Shibin Tang, Chun Zhu   +17 more
core   +1 more source

Functional anatomy, jaw mechanisms, and feeding behavior of Dunkleosteus terrelli (Placodermi, Arthrodira)

The Anatomical Record, EarlyView.
A new musculoskeletal reconstruction and revision of the cranio‐mandibular anatomy of the Devonian arthrodire placoderm Dunkleosteus terrelli from a comparative and functional anatomical perspective. Dunkleosteus is a specialized arthrodire with many specializations for feeding on large vertebrates, and many of its features are part of broader ...
Russell K. Engelman, Robert K. Carr, Kate Trinajstic, Zerina Johanson, Oleg A. Lebedev   +4 more
wiley   +1 more source

Disaster mechanism of thick-hard roof and control technology by hydraulic fracture with directional long borehole

Meitan kexue jishu
In response to the main technical challenges faced by coal production enterprises in the long-term prevention and control of disasters caused by the thick-hard hanging roof fracturing in longwall mining faces, taking the 8238 fully-mechanized top-caving ...
Zhaozhong LI, Rui WANG
doaj   +1 more source

Fracture and control technology of hard and thick rock in mining engineering

Geomatics, Natural Hazards & Risk, 2023
The advent of non-pillar mining technology of self-formed roadway based on roof cutting theory (NPMTSFRRCT) has revolutionized the method of tackling the difficulties posed by hard suspended roofs in mining engineering.
Xuhui Xu, Bingquan Liu, Fulian He, Kai Lv, Gustavo Paneiro   +4 more
doaj   +1 more source