Results 11 to 20 of about 277,297 (279)

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

Interpretation of petrographic anisotropy in ornamental granites based on P wave velocity measurements

open access: yesMateriales de Construccion, 2020
The existence of a possible anisotropy, determined by the orientation of any mineral or by micro­crack network in granite rock, isn´t easily detected by the naked eye.
L. Calleja   +3 more
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

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

U-Pn geochronology of deformed metagranites in central Sutherland, Scotland: evidence for widespread late Silurian metamorphism and ductile deformation of the Moine Supergroup during the Caledonian orogeny [PDF]

open access: yes, 2003
Within the Caledonides of central Sutherland, Scotland, the Neoproterozoic metasedimentary rocks of the Moine Supergroup record NW-directed D2 ductile thrusting and nappe assembly, accompanied by widespread tight-to-isoclinal folding and amphibolite ...
Friend, C.R.L.   +5 more
core   +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

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

Effect of Coarse Aggregate Sizes and Replacement Levels on the Strength of Palm Kernel Shell (PKS) Concrete [PDF]

open access: yes, 2013
The maximum coarse aggregate size used in concrete can impact on its strength. An investigation of the effect of coarse aggregate size and replacement level of granite with palm kernel shell (PKS) on the compressive and tensile strengths of PKS concrete ...
Babafemi, A. J, Olusola, K. O
core   +2 more sources

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

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