Results 11 to 20 of about 455,086 (317)

Distribution Characteristics and Sources Identification of Selenium-rich Soils in the Ecological Conservation Area of the Daqinghe River Watershed, Beijing

open access: yesYankuang ceshi, 2019
BACKGROUND Beijing is a typical geographical distribution area of selenium deficiency. However, some research results in recent years indicate that the soils in some areas reaches the level of selenium enrichment.
FENG Hui   +3 more
doaj   +1 more source

El Rock y la ciudad

open access: yesAnales del Instituto de Arte Americano e Investigaciones Estéticas "Mario J. Buschiazzo", 2023
Te devora la ciudad. Itinerarios urbanos y figuraciones espaciales en el rock de Buenos Aires. Sánchez Trolliet, Ana. Buenos Aires, Argentina: Editorial Universidad Nacional de Quilmes, 2022, 347 páginas.
Juan Sebastián Malecki
doaj  

Methods and Points of Attention for the Direct Tension Test on Rock

open access: yesJournal of MMIJ, 2016
Compared to uniaxial or triaxial compression tests on rocks, direct tension tests on rocks are not common in practice. As is well known, the reasons are because underground rock masses are usually under compressive stress state and/or because the direct ...
Kimihiro HASHIBA   +5 more
doaj   +1 more source

Od psalmów dawidowych do chrześcijańskiego rocka - muzyczna subkultura młodzieżowa jako narzędzie ewangelizacji. Ujęcie historyczne

open access: yesSeminare
Celem artykułu jest ukazanie muzyki rockowej jako narzędzia ewangelizacji. Sobór Watykański II zapoczątkował nową relację środowiska kościelnego ze światem kultury i sztuki.
Artur Chejnowski
doaj   +1 more source

Measurement of Suction Pressure Generated in the Process of Frost Heaving in Rock

open access: yesJournal of MMIJ, 2017
Recently it has been found that frost heave phenomena can be seen not also in soil but also in rock. It is obvious, however, that the number of researches on frost heaving in rock is much less than that of researches on frost heaving in soil.
Dai NAKAMURA   +5 more
doaj   +1 more source

Study of the possibility of diamond formation at moderate pressures and temperatures [PDF]

open access: yesФизико-химические аспекты изучения кластеров, наноструктур и наноматериалов, 2017
Data on the diamond synthesis in experiments with carbon-saturated metal melts at moderate pressures and temperatures are presented. Features of the resulting diamond phase, the types and nature of inclusions are discussed and compared with those for ...
S.А. Voropaev   +4 more
doaj   +1 more source

Study on the size effect of rock elastic modulus considering the influence of joint roughness

open access: yesFrontiers in Materials
The elastic modulus of rocks is a measure of the ability of rocks to resist elastic deformation. It is related to the size of rocks and can effectively measure the internal physical and mechanical strength of rocks.
Gaojian Hu   +6 more
doaj   +1 more source

Rock strength criterion considering the effect of hydrostatic stress on lode angle effect

open access: yesEnergy Science & Engineering, 2019
Rock strength criterion is a basic subject in mining engineering and petroleum engineering. It has important guiding significances to the process of underground energy exploitation. Different rocks have different strength envelopes.
Zhenlong Song   +4 more
doaj   +1 more source

Effect of Water Saturation on Stress-Strain Curve of Rocks in Uniaxial Compression

open access: yesJournal of MMIJ, 2017
The effect of water on the mechanical properties of rocks, such as strength and Young's modulus, has been investigated in many studies. To understand the mechanism of the effect of water on the mechanical behavior of rocks, not only these mechanical
Minami KATAOKA   +3 more
doaj   +1 more source

Dependence of Uniaxial Compressive Strength of Sanjome Andesite on Loading Rate and Water Saturation

open access: yesJournal of MMIJ, 2018
It is known that the rock strength increases with an increase in loading rate. Many studies on the loadingrate dependence of rock strength have been performed under two environments, namely water-saturated and airdried conditions, and the loading-rate ...
Minami KATAOKA   +2 more
doaj   +1 more source

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