Results 81 to 90 of about 64,179 (348)

Petrology of Yaluninogorsk granitoid massive (Alapaevsk-Sukhoi Log porphyry copper zone, Middle Urals)

open access: yesЛитосфера, 2018
Yaluninogorsk quartz diorite-trondhjemite massif is situated in Alapaevsk-Sukhoy Log zone of Eastern-Ural High potentially productive for Cu (±Mo) porphyry type of mineralization. The massif is a magma chamber 3 × 2 km under central type volcano.
Sergei V. Pribavkin   +2 more
doaj   +1 more source

Mechanism of Roof‐Cutting by Densely Drilled Holes in Gob‐Side Entry Retaining and Its Main Influencing Factors

open access: yesEnergy Science &Engineering, EarlyView.
ABSTRACT Roof‐cutting by densely drilled holes (RCDDH) has been widely adopted in many coal mines across China as an innovative roof‐cutting technique. However, research on its underlying mechanism and key parameters remains limited, particularly regarding the failure mechanisms of the drilled holes.
Shaowei Liu   +6 more
wiley   +1 more source

Long‐Term Performance Analysis of Foundation Pile and Vertical Borehole Heat Exchangers for Ground Source Heat Pump Systems in Cold Climates

open access: yesEnergy Science &Engineering, EarlyView.
ABSTRACT Ground source heat pump systems (GSHPs) have received considerable interest from researchers for the decarbonization of energy use in buildings owing to their higher efficiency. The ground heat exchanger (GHE) is the primary component of a GSHP. Vertical borehole heat exchangers (VBHE) and foundation piles (FP) are common GHEs that researchers
Philip Adebayo   +5 more
wiley   +1 more source

Quantitative Identification and Distribution Pattern of Macrolithotype of Coal in Deep Coal Seams of the Daji Block

open access: yesEnergy Science &Engineering, EarlyView.
ABSTRACT The construction of a logging response model for macrolithotypes in coal has been successfully completed. This model has enabled delineation of vertical and planar distribution patterns of coal macrolithotypes within the #5 and #8 coal seams of the Daji block, as well as to forecast the distribution of favorable reservoir conditions.
Wei Zhang   +5 more
wiley   +1 more source

Pore Structure of Tight Sandstones With Different Sedimentary Microfacies in the Chang 6–Chang 9 Layers, Triassic Yanchang Formation, Wuqi Area, Ordos Basin

open access: yesEnergy Science &Engineering, EarlyView.
Taking the Chang 6–Chang 9 layers in the Wuqi area of the Ordos Basin as a case study, this study investigates the pore characteristics of tight sandstones formed under different sedimentary microfacies. The results indicate that tight sandstones associated with distinct sedimentary microfacies exhibit significant variations in pore types, pore size ...
Liling Zhang   +7 more
wiley   +1 more source

The Petrology of the Igneous Rocks [PDF]

open access: bronze, 1914
F. H. Hatch, A. K. Wells, M. K. Wells
openalex   +1 more source

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