Results 61 to 70 of about 7,058,324 (263)

The Significance of Angular K-feldspar Grains in Ancient Sandstones [PDF]

, 2018
In our studies of ancient sandstones, many of which are purported in the conventional literature to be eolian deposits, we frequently encountered angular K-feldspar sand grains.
Strom, Raymond, Whitmore, John H.
core   +2 more sources

Microscopic mechanism of sandstone hydration in Yungang Grottoes, China

Open Geosciences, 2020
The macroscopic engineering properties of sandstone are dominated primarily by mineral features in a microscopic scale. This study will investigate the microscopic physical and mechanical properties of the main minerals (quartz, K-feldspar, Na-feldspar ...
Chen Jiawei, Xu Jinming, Huang Jizhong
doaj   +1 more source

An Analysis of Relationship between the Microfracture Features and Mineral Morphology of Granite

Advances in Civil Engineering, 2021
Using the techniques of X-ray diffraction, polarizing microscopy, uniaxial compression, and scanning electron microscopy (SEM), the relationships between the microfracture features and mineral morphology of granite were studied.
Meiben Gao, Tianbin Li, Junxun Zhu, Hongyu Yin, Yongyi Yang   +4 more
doaj   +1 more source

Thermal‐induced fracture evolution and acoustic signature of Beishan granite: Insights into tensile strength of barrier system for high‐level radioactive waste disposal

Deep Underground Science and Engineering, EarlyView.
The tensile strength of granite, a proposed host for nuclear waste, degrades severely above 400°C. We link this to specific microcracking patterns captured by acoustic emission, establishing a scientific basis for assessing repository safety under thermal load.
Wei Zeng, Shijie Li, Xiaozhao Li, Zhen Huang, Shangtong Yang, Wentao Xu, Biao Wang, Yun Wu   +7 more
wiley   +1 more source

Construction of a 'global standardised growth curve' (gSGC) for infrared stimulated luminescence dating of K-feldspar [PDF]

, 2015
We investigated the infrared stimulated luminescence (IRSL) and post-infrared IRSL (pIRIR) signals emitted by K-feldspars from sedimentary samples from Asia, Europe and Africa using a single-aliquot multiple elevated temperature (MET) stimulation ...
Yujie Guo (20125455), Sheng-Hua Li (2268709), Zenobia Jacobs (19583683), Bo Li (19583689), Richard Roberts (19583686)   +4 more
core  

Engineered K-fertilizer derived from hydrothermally altered K-feldspar [PDF]

, 2020
International audienceEngineered K-fertilizer derived from hydrothermally altered K-feldsparRoland Hellmann, ISTerre, Univ. Grenoble Alpes, Grenoble, FranceYuanyuan Zhai, Chinese Academy of Sciences, Beijing, ChinaAbstract #: 3290085 (invited talk ...
Hellmann, Roland
core  

K-feldspar data table: Assessing mineral fertility and bias in sedimentary provenance studies: examples from the Barents Shelf [PDF]

, 2019
U–Pb and trace element data for detrital apatite and detrital rutile, Pb isotopic data for detrital K-feldspar, U–Pb data for detrital zircon and a detailed analytical ...
Dirk Frei (2842550), Andrew C. Morton (2845319), David M. Chew (2840810), J. Stephen Daly (2843273), Edward J. Fleming (6198380), Michael J. Flowerdew (2843276)   +5 more
core   +1 more source

Aspergillus niger as an eco-friendly agent for potassium release from K- bearing minerals: Isolation, screening and culture medium optimization using Plackett-Burman design and response surface methodology

Heliyon
The potential of Aspergillus niger, to enhance non-exchangeable potassium (K+) release from mineral structures were investigated as a cost-effective and environmentally friendly alternative to traditional chemical fertilizers.
Sanaz Ashrafi-Saiedlou, MirHassan Rasouli-Sadaghiani, Abass Samadi, Mohsen Barin, Ebrahim Sepehr   +4 more
doaj   +1 more source

Petrographic and Lithofacies of Injana Formation Berman Inticline Northern Iraq

Tikrit Journal of Pure Science, 2023
This study is including Petrographic and Lithofacies investigation of Injana Formation North Iraq. The Formation composed of succession of sandstone, siltstone and claystone cycles.
Amaar J. Mohammed Al-Taiiy
doaj   +1 more source

Mechanisms of Roadway Instability and Coupled Control Technology for Working Face Passing Through Fault Zones

Energy Science &Engineering, EarlyView.
This study mainly explores the instability characteristics of roadways near faults in the working face. Taking the 51104 transportation roadway of the 51104 working face in Shengxin Coal Mine as the main research object, through theoretical analysis, borehole inspection, numerical simulation and on‐site mine pressure observation, the instability ...
Shuaifeng Yin, Yitao Yan, En Wang, Xubo Zhao, Kanglei Han   +4 more
wiley   +1 more source