Results 41 to 50 of about 844 (164)

Late Holocene environmental history of Dojran, Macedonia: Investigating the interplay of imperial dynamics and climatic change

Journal of Quaternary Science, EarlyView.
ABSTRACT This study presents a high‐resolution, multi‐proxy reconstruction of environmental and land‐use change from Lake Dojran over historical times (last 2500 years), combining pollen, biomarkers, radiocarbon dating, Ottoman taxation records and other historical data.
Alessia Masi, Lucrezia Masci, Georgios C. Liakopoulos, Monica Bini, Alexander Francke, Ilaria Isola, Carlo Ricotta, Laura Sadori, Alexander Sarantis, Sławomir Sprawski, Jakub Sypiański, Irene Tunno, Cristiano Vignola, Bernd Wagner, Giovanni Zanchetta, Adam Izdebski   +15 more
wiley   +1 more source

The Evolution of Autonomous Systems for Planetary Cave Exploration: A Review

Journal of Field Robotics, EarlyView.
ABSTRACT The exploration of Subsurface Access Points (SAPs), such as lava tubes on the Moon and Mars, has gained significant interest due to their potential as stable environments shielded from surface radiation and temperature extremes. These sites are considered high‐value targets for detecting water and signs of ancient life, and assessing their ...
Sarah Swinton, Daniel Mitchell, Jamie Blanche, Euan McGookin, David Flynn   +4 more
wiley   +1 more source

Development of an optimal draw control strategy for a sublevel caving operation at Malmberget mine

, 2020
This paper addresses the identification of the optimal draw control strategy for a sublevel caving (SLC) operation at Malmberget mine in Sweden. Two mathematical models, a probability model and an economic model, were created using five datasets: bucket ...
Gustafson, Anna,, Jonsson, Kristina,, Martinsson, Jesper,, Schunnesson, Håkan,, Shekhar, Gurmeet,   +4 more
core   +1 more source

Research on the height of “two zones” in overlying strata of fully mechanized caving mining of extra-thick coal seam based on multi-source data fusion

Meikuang Anquan
To prevent water inrush accidents in the coal mining face caused by the development of the water-conducting fracture zone in the overlying strata to the aquifer, this study conducts an in-depth study on the height of the water-conducting fracture zone ...
Lingtao KONG, Xiaoming LI, Yongjun LI, Rui XU, Xiaobin XU, Haisong ZHANG   +5 more
doaj   +1 more source

Study on the Top Coal Recovery Behavior and Parameter Optimization Under Different Caving Ratios in Thick Coal Seam Mining

Processes
Longwall top coal caving is one of the most effective methods for extracting steeply inclined and ultra-thick coal seams. To investigate the influence of caving ratio (the proportion between mining height and top coal thickness) on top coal recovery behavior and ground pressure characteristics, this study employs both the Particle Flow Code (PFC ...
Jiantao Cao, Wen Zhang, Xingping Lai, Shuai Zhang, Chang Xin, Feilong Xin, Lizheng Xu   +6 more
openaire   +1 more source

Making the Intangible Tangible: Organizational Capital and Stock Liquidity

British Journal of Management, EarlyView.
Abstract We propose an intangibility‐driven stock liquidity hypothesis and explore the role of organizational capital in influencing stock liquidity. Using a sample of 42,682 firm‐year observations, we uncover compelling evidence that firms' intangible organizational capital boosts stock liquidity.
Prem Puwanenthiren, Md Samsul Alam, Shehub Bin Hasan, Sivathaasan Nadarajah   +3 more
wiley   +1 more source

The Early Upper Palaeolithic open‐air site of Friedrichsdorf‐Seulberg, Germany, in the context of the northern central European Aurignacian

Boreas, EarlyView.
Our knowledge of the Early Upper Palaeolithic occupation in northern central Europe is very limited, and recent research at the open‐air site of Friedrichsdorf‐Seulberg in Hesse, Germany, provides important new information on the Aurignacian. The site is rather small (26.5 m2) and spatial analysis identified a central hearth with two associated ...
Tilman Böckenförde, Gabriele Russo, Neda Rahimzadeh, Felix Bittmann, Nikolitsa Nikolakopoulou, Thomas Terberger   +5 more
wiley   +1 more source

Study on Regional Strata Movement during Deep Mining of Erdos Coal Field and Its Control

, 2022
Disasters such as rock bursts and mine earthquakes became increasingly serious with the increase in mining depth in Erdos Coal Field and became serious problems that restrict high-strength continuous mining of coal mines.
Leilei Zhong, Zhang, Guojian, Guo, Guangli, Zhiyang Wang, Zhong, Leilei, Wei, Wei, Yaqiang Gong, Fugang Wang, Guojian Zhang, Wang, Fugang, Gong, Yaqiang, Guangli Guo, Wei Wei, Wang, Zhiyang   +13 more
core   +1 more source

Influence of particle characteristics on dynamic characteristics of tail beam under coal rock caving impact

Frontiers in Energy Research, 2022
In order to improve the accuracy of simulation parameters used in the discrete element simulation test of a fully mechanized top-coal caving process and further explore the intelligent fully mechanized coal caving technology, this research work studies ...
Lijuan Zhao, Lijuan Zhao, Liguo Han, Haining Zhang, Man Ge, Shijie Yang, Xin Jin   +6 more
doaj   +1 more source

Regional Trade Agreements and International R&D Spillovers: Implications for Developing Countries

The Developing Economies, EarlyView.
ABSTRACT We provide new evidence on heterogeneous international research and development (R&D) spillovers from partners of regional trade agreements (RTAs) and non‐partners using a sample of 45 economies in the period 1995–2017. We construct separate R&D stocks for RTA partners and non‐partners and find that spillovers from RTA partners are stronger ...
Yukiko Sawada, Rinki Ito, Naoto Jinji
wiley   +1 more source