Results 121 to 130 of about 34,203 (251)

Investigation of Borehole Stability in Malmberget

, 2012
Sublevel caving method is generally selected for large ore bodies with steep slope. This method is based on the gravity flow of the ore to get better recovery. Due to the continuous caving as the mining goes deeper, fractures of hanging wall occur consequently and thus it collapses into the cave.
openaire   +2 more sources

EXPERIENCING MORE‐THAN‐PANDEMIC WATERSCAPES: An Intra‐urban Comparison of Water Practices and Geographies in Nairobi

International Journal of Urban and Regional Research, EarlyView.
Abstract While many African cities, such as Nairobi, fared comparatively well during the pandemic years, urban residents still faced compounded uncertainties and an unequal distribution of burdens that were infrastructurally co‐mediated, for example, within and through place‐specific waterscapes and their socio‐technical infrastructures.
Moritz Kasper, Elizabeth Wamuchiru, Sophie Schramm   +2 more
wiley   +1 more source

Hydraulic In Vitro Characterization of MR‐Conditional Blood Pumps

Artificial Organs, EarlyView.
Cardiac surgery in neonates requires close placement of cardiopulmonary bypass machines due to limited blood volume, complicating MR compatibility. This study introduces three MR‐conditional blood pump prototypes. None interfered with MRI imaging, though RF‐related sensor effects remain untested.
Dominik T. Schulte, Marcel Renggli, Henning Richter, Francesca Del Chicca, Michael Hofmann, Martin O. Schmiady, Marianne Schmid Daners   +6 more
wiley   +1 more source

Living by the lake: Plant food diversity in a prehistoric lake‐dwelling community in the Republic of North Macedonia

Archaeometry, EarlyView.
Abstract This paper explores the relationship between wetland ecosystems and prehistoric lakeshore settlements within the Lake Ohrid basin (a biodiversity hotspot) by considering plant food systems at Ploča Mičov Grad, North Macedonia. The mid‐fifth millennium (c.4555–4373 to 4437–4241 cal BCE) waterlogged assemblage contained a diverse spectrum of ...
Amy Holguin, Michael Charles, Ferran Antolín, Rachel Ballantyne, Müge Ergun, Albert Hafner, Stefanie Jacomet, André F. Lotter, Goce Naumov, Johannes Reich, Raül Soteras, Elizabeth Stroud, Willy Tinner, Rachel Wood, Amy Bogaard   +14 more
wiley   +1 more source

Theoretical Analysis of the Vertical Stability of a Floating and Sinking Drilled Wellbore Using Vertical Elastic Supports

Applied Sciences
This study addresses the calculation of vertical stability for shaft walls during floating and sinking processes in deep vertical shaft drilling in Western China.
Zhiwei Zhang, Hua Cheng, Xiaoyun Wang, Bao Xie, Mingrui Sun   +4 more
doaj   +1 more source

Palaeoenvironmental evolution of the Baltic Sea basin during the Last Interglacial (Eemian, Mikulino stages): a review

Boreas, EarlyView.
This review presents an investigation of the evolution of the Baltic Sea basin and its connections through the Eemian Stage, based upon sequences of marine and associated deposits from the White Sea to the Southwest Baltic, via the Karelian channel. Pollen analyses, foraminiferal and ostracod analyses provide the evolution of relative sea‐level change,
Philip L. Gibbard, Karen L. Knudsen
wiley   +1 more source

Stratigraphic evidence for modern‐like glacier extents in south‐central Alaska within the last glacial period (MIS 3)

Boreas, EarlyView.
The last (Wisconsinan) glacial period was punctuated in North America by two glacial maxima, known as the Early and Late Wisconsinan glaciations. In Alaska, these maxima and their subsequent retreats have been the object of dating efforts to reconstruct local climatic events and compare them to global trends.
Bruno Belotti, Elizabeth J. Cassel, Timothy C. Bartholomaus, Michael G. Loso, Michael S. Christoffersen, John W. Holt   +5 more
wiley   +1 more source

Borehole stability on Yme

, 2007
Master's thesis in Petroleum ...
openaire   +1 more source

Middle to Late Pleistocene landscape evolution and glacial dynamics in the Eastern Alps: the Gröbminger Mitterberg record, Austria

Boreas, EarlyView.
Glacial erosion during the Last Glacial Maximum (LGM) has removed much evidence of earlier glaciations and interglacials in the European Alps. At Gröbminger Mitterberg (GM), beneath a blanket of LGM till, a distinctive sediment archive preserves deposits predating the LGM.
Gerit E. U. Griesmeier, Daniel P. Le Heron, Christopher Lüthgens, Gustav Firla, Bernhard Salcher, Fabian Dremel, Jan‐Christoph Otto, Jürgen M. Reitner   +7 more
wiley   +1 more source

Development and application of high-performance drilling hole protection materials

Scientific Reports
The instability and collapse of the extraction borehole seriously affects the gas extraction effect, and it is of great significance to study the efficient borehole protection technology to improve the stability of the borehole and ensure the gas ...
Xuebo Zhang, Yuhang Wang, Jianliang Gao, Linxiu Han, Xinhui Ge, Ming Yang, Shengcheng Wang   +6 more
doaj   +1 more source