Results 11 to 20 of about 15,532 (257)

Rural Superintendents' Perceptions of Principal Preparation

open access: yesThe Rural Educator, 2010
As national and state expectations for school leadership comptencies increase, new principals face an ever expanding role. Yet, scant attention is paid to the unique contextual needs of the varied school settings in which principals find themselves. This
Martha Cray, Elaine M. Millen
doaj   +1 more source

Frequency and Clinical Review of the Aberrant Obturator Artery: A Cadaveric Study

open access: yesDiagnostics, 2020
The occurrence of an aberrant obturator artery is common in human anatomy. Detailed knowledge of this anatomical variation is important for the outcome of pelvic and groin surgeries requiring appropriate ligation.
Guinevere Granite   +2 more
doaj   +1 more source

The influence of mineralogical composition and alkali reactivity for utilization of some Egyptian crushed granites as a concrete aggregate

open access: yesJournal of Building Materials and Structures, 2023
Egyptian Eastern Desert is rich in many areas that contain granites masses throughout the geological era; some of them show good characteristics of the rock hardness, durability, density and mineralogy.
Maged El-fakharany   +2 more
doaj   +1 more source

The use of granite powder waste in cementitious composites

open access: yesJournal of Materials Research and Technology, 2023
This paper focuses on literature analyses of the impact of granite powder waste on the properties of cementitious mixes and composites. The influence of weather conditions on the properties of granite rocks is also analysed.
Adrian Chajec
doaj   +1 more source

The Size Effect and Microstructure Changes of Granite after Heat Treatment

open access: yesAdvances in Materials Science and Engineering, 2021
High temperature can change the mechanical properties of granite, with significant nonlinear characteristics, and at the same time change its microstructure.
Zhongping Guo   +4 more
doaj   +1 more source

Study of surfaces, produced with the use of granite and titanium, for applications with solar thermal collectors

open access: yesReviews on Advanced Materials Science, 2021
The present work consisted in obtaining and studying selective surfaces for applications in low-cost flat plate solar collectors, using residues from the granite industry.
Alves Albuquerque Araújo Felipe   +5 more
doaj   +1 more source

Stochastic model for crop water stress during agricultural droughts

open access: yesEngineering Reports, 2019
The increasing occurrence of severe droughts and sparse rainfall due to climate change is resulting in high and costly demand for water resources. A greater understanding of uncertainties associated with the creeping occurrence of agricultural drought ...
Debdas Mukherjee
doaj   +1 more source

Structural features and emplacement of the late Svecofennian Perniö granite sheet in southern Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 1996
The 1840-1830 Ma old Perniö granite occupies the southern margin of the Sauvo-Perniö granite area located in the western part of the late Svecofennian granite-migmatite zone in southern Finland.
O. Selonen, C. Ehlers, A. Lindroos
doaj   +1 more source

AE Characteristics of Rockburst Tendency for Granite Influenced by Water Under Uniaxial Loading

open access: yesFrontiers in Earth Science, 2020
In deep mining, granite is stored with high energy duing to its structural integrity and brittleness. Rock bursts usually occur because stress changes and mining disturbances during mining, which seriously threaten safe production. Focusing on the factor
Yihan Zhang   +4 more
doaj   +1 more source

Experiment research of the influence of different cooling times on the drillability of high-temperature granite

open access: yes地质科技通报, 2023
To study the drillability and microscopic damage changes of granite after high temperature exposure and to study the influence of different cooling times on drillability after high temperature exposure, granite for high-temperature heat treatment was ...
Shuai Chen   +4 more
doaj   +1 more source

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